JP2006165934A - Digital broadcasting receiving system, portable terminal and digital broadcasting receiving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable receiver for receiving broadcasting for a mobile receiver, while moving indoors, and for performing television viewing, without incurring cost, and to provide a digital broadcasting receiving device that realizes this. <P>SOLUTION: A tuner 11 tunes according to an input from an operating part 16. A demodulating part 12 performs OFDM demodulation on a signal turned by the tuner 11. A TS demultiplexer 13 separates TS packets for each purpose, and performs predetermined processing. A radio-transmitting/receiving part 15 transmits radio signal to the external part. For example, the TS packet signal, obtained by demodulation by the demodulating part 12, is transmitted to a portable telephone set 2 by means of a radio signal(Bluetooth (R) system or the like). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a digital broadcast receiving system, a portable terminal, and a digital broadcast receiving apparatus.

  In December 2003, digital terrestrial television broadcasting was started in the Tomeihan area. Digital terrestrial television broadcasting adopts (1) high-quality video and audio compared to analog broadcasting, (2) OFDM (Orthogonal Frequency Division Multiplexing), which is strong against multipath, and is strong against ghost, (3) data High-definition broadcasting and data broadcasting services for stationary TVs are being implemented.

  In terrestrial digital television broadcasting, broadcasting services for mobile receivers are also possible due to the transmission standards, and broadcasting services for portable receivers are scheduled to be implemented in the near future. When a broadcasting service for mobile receivers is started, it becomes possible to view TV in a mobile environment.

In Japanese terrestrial digital television broadcasting, an ISDB-T (Integrated Services Digital Broadcasting for Terrestrial) system is adopted in consideration of commonality between television broadcasting and audio broadcasting. In the ISDB-T system, hierarchical transmission by frequency division is performed in order to enable a mixture of programs for fixed reception and programs for mobile reception. That is, by dividing one channel (5.6 MHz band) into 13 segments, a plurality of broadcast services can be performed simultaneously. Among the 13 segments, the central one segment is used for transmission of various control signals, signals for data broadcasting, video / audio signals for received programs for movement, and the like. The other 12 segments are used for transmission of video / audio signals for programs for mobile reception. The broadcast service for mobile receivers is performed using one segment located in the center of the 13 segments, and the broadcast service for fixed reception is performed using all 13 segments.
Japanese Patent Laid-Open No. 2004-112079 JP 2002-94402 A Tsurumi Ito and three others, "Mobile phone for digital terrestrial broadcasting", Sanyo Electric Technical Report, Vol. 36, June 2004, Vol. 74 Masahiro Sata, “Digital Terrestrial Broadcasting Service and Receiver for Mobile Devices”, Journal of the Institute of Image Information and Television Engineers, Vol. 58, no. 5, pp 643-646, 2004

  However, when receiving the terrestrial digital television broadcast with the above-described portable receiver, sufficient reception sensitivity may not be ensured due to the downsized antenna of the portable receiver. In addition, in the case of indoors, the reception sensitivity is lowered, so that it is difficult to view a television with a portable receiver.

  Therefore, it is conceivable to enable a portable receiver to view a television by receiving a broadcast wave using a fixed UHF antenna and transferring the received signal to the portable receiver. However, since the terminal of the UHF antenna is usually fixed to an indoor wall or the like, it is necessary to wire-connect the receiver to the UHF antenna terminal in order to view a television with a portable receiver. Therefore, it is difficult to view a television with a portable receiver while moving indoors.

  Therefore, it is also conceivable to receive broadcasts for mobile receivers, demodulate them, and retransmit them over the air (IEEE802.11a / b / g, Bluetooth (registered trademark), etc.). However, the installation of such a re-transmission device causes a burden that it is costly for the user.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a portable receiver that can receive a broadcast for a mobile receiver and watch a television while moving indoors without incurring costs. It is another object of the present invention to provide a digital broadcast receiving apparatus that enables this.

  The present invention relates to a digital broadcast receiving system including a digital broadcast receiving device and a portable terminal capable of communicating with the digital broadcast receiving device. The digital broadcast receiving apparatus includes: a first receiving unit that receives a broadcast wave; a channel selection unit that extracts a broadcast signal of a predetermined channel from the broadcast wave received by the first reception unit; and an output signal of the channel selection unit. A first demodulator that demodulates and outputs a TS packet signal, an extractor that extracts a packet signal for mobile reception digital broadcasting from the TS packet signal obtained by the first demodulator, and the extractor extracts A modulation unit that modulates the received signal into a predetermined modulation signal, and a transmission unit that transmits the signal modulated by the modulation unit to the portable terminal. The portable terminal includes a video / audio output unit that outputs a video signal and / or an audio signal, a second receiver that receives a signal from the transmitter of the digital broadcast receiver, and the second receiver that receives the signal. A second demodulator that demodulates the signal and outputs a TS packet signal, and generates a video signal and / or an audio signal output from the video / audio output unit based on the TS packet signal output from the second demodulator And a video / audio signal generating unit.

  A second aspect of the present invention relates to a digital broadcast receiving system including a digital broadcast receiving device and a portable terminal capable of communicating with the digital broadcast receiving device. The digital broadcast receiving apparatus includes a first receiving unit that receives a broadcast wave, a first channel selecting unit that extracts a broadcast signal of a predetermined channel from the broadcast wave received by the first receiving unit, and the first channel selecting unit. A first demodulator that demodulates the output signal and outputs a TS packet signal; an extractor that extracts a packet signal for digital reception for mobile reception from the TS packet signal obtained by the first demodulator; A modulation unit that modulates the signal extracted by the extraction unit into a predetermined modulation signal; and a transmission unit that transmits the signal modulated by the modulation unit to the portable terminal. The portable terminal includes a video / audio output unit that outputs a video signal and / or an audio signal, a second receiver that receives a signal from the transmitter of the digital broadcast receiver, and the second receiver that receives the signal. A second demodulator that demodulates the signal and outputs a TS packet signal; a third receiver that receives the broadcast wave; and a second channel selector that selects a channel from the broadcast wave received by the third receiver. A third demodulator that demodulates the output signal of the second channel selection unit and outputs a TS packet signal, a TS packet signal obtained by the second demodulator, and a TS packet obtained by the third demodulator A selection output unit that selects and outputs one of the signals, and a video / audio that generates a video signal and / or an audio signal output from the video / audio output unit based on a TS packet signal output from the selection output unit Signal generator It has a.

  The portable terminal of claim 3 includes a first receiving unit that receives broadcast waves, a second receiving unit that receives radio signals including digital broadcast signals, and a video and audio output unit that outputs video signals and / or audio signals. A channel selection unit that extracts a broadcast signal of a predetermined channel from a broadcast wave received by the first reception unit; a first demodulation unit that demodulates an output signal of the channel selection unit and outputs a TS packet signal; 2 a second demodulator that demodulates a radio signal received by the receiver and outputs a TS packet signal; a TS packet signal obtained by the first demodulator; a TS packet signal obtained by the second demodulator; A selection output unit for selecting and outputting either, and a video / audio signal generation for generating a video signal and / or an audio signal output from the video / audio output unit based on a TS packet signal output from the selection output unit Part It has a.

  A fourth aspect of the present invention is the portable terminal according to the third aspect, further comprising an operation unit that receives a user input, and the selection output unit selects a TS packet signal to be output based on an input from the operation unit. To do.

  5. The portable terminal according to claim 3, wherein the selection output unit includes a signal strength of a broadcast wave received by the first receiving unit and a signal strength of a radio signal received by the second receiving unit. Based on the above, the TS packet signal to be output is selected.

  A sixth aspect of the present invention is the mobile terminal according to the fourth aspect, wherein the selection output unit includes SI (Service Information :) included in the TS packet signal obtained by the first demodulation unit and the second demodulation unit. A TS packet signal to be output is selected based on whether or not program sequence information) and / or PSI (Program Specific Information) information has been reproduced.

  A seventh aspect of the present invention is the mobile terminal according to any one of the third to sixth aspects, wherein the selection output unit selects a TS packet signal to be output when the mobile terminal is powered on.

  Claim 8 is the mobile terminal according to any one of claims 3 to 6, wherein the selection output unit selects a TS packet signal to be output when the TV viewing mode of the mobile terminal is activated. To do.

  The digital broadcast receiver according to claim 9 is a receiving unit that receives a broadcast wave, a channel selection unit that extracts a broadcast signal of a predetermined channel from the broadcast wave received by the reception unit, and a demodulator of an output signal of the channel selection unit A demodulator that outputs a TS packet signal, an extractor that extracts a digital broadcast packet signal for mobile reception from the TS packet signal obtained by the demodulator, and a signal extracted by the extractor A modulation unit that modulates the modulated signal, and a transmission unit that transmits the signal modulated by the modulation unit to the outside.

  The extraction unit extracts, for example, a packet signal for digital reception for mobile reception based on a PID (Packet IDentifier) of the TS packet signal.

  A tenth aspect of the present invention is the digital broadcast receiving apparatus according to the sixth aspect, further comprising a second receiving unit that receives a signal from a portable terminal capable of receiving a digital broadcast wave for mobile reception, wherein the second receiving unit When the received signal from the mobile terminal is a signal requesting transmission of a digital broadcast signal, the transmitting unit transmits the signal modulated by the modulating unit to the mobile terminal.

  An eleventh aspect of the present invention is the digital broadcast receiving apparatus according to the ninth or tenth aspect, wherein if the digital broadcast receiving apparatus is in use, the digital broadcast receiving apparatus is in use to the portable terminal. Notice.

  A twelfth aspect of the present invention is the digital broadcast receiving apparatus according to any one of the ninth to eleventh aspects, wherein the mobile terminal is notified of channel information selected by the digital broadcast receiving apparatus.

  A thirteenth aspect of the present invention is the digital broadcast receiving apparatus according to the eleventh or twelfth aspect, in which the portable terminal is inquired as to whether or not the channel selected by the digital broadcast receiving apparatus is desired.

  14. The digital broadcast receiving apparatus according to claim 9, further comprising a receiving unit that receives a signal from a portable terminal capable of receiving a digital broadcast wave for mobile reception, and the portable unit received by the receiving unit. When the signal from the terminal is a signal designating a channel different from the channel selected by the channel selection unit, the channel selection unit selects a channel by giving priority to the signal from the portable terminal. .

  The digital broadcast receiver according to claim 15 is a receiving unit that receives a broadcast wave, a first channel selecting unit that selects a channel from a broadcast wave received by the receiving unit, a second channel selecting unit, and the first channel selecting unit. A first demodulator that demodulates an output signal of the channel selection unit and outputs a TS packet signal, a second demodulation unit that demodulates an output signal of the second channel selection unit and outputs a TS packet signal, and the first demodulation unit Alternatively, an extraction unit for extracting a packet signal for mobile reception digital broadcasting from a TS packet signal obtained by either of the second demodulation units, and modulating the signal extracted by the extraction unit to an external transmission signal A receiving unit that receives a signal from a portable terminal capable of receiving a digital broadcast wave for mobile reception, and a receiving unit that receives the signal modulated by the modulating unit, Received from the mobile terminal Is a signal that designates a channel different from the channel selected by the channel selection unit, the channel selection unit that is not in use among the first channel selection unit and the second channel selection unit generates a signal from the mobile terminal. Based on the channel selection.

  Claim 16 is a portable terminal communicable with the digital broadcast receiver according to any one of claims 9 to 15, having an operation unit that receives a user's input, and input from the operation unit The mobile terminal according to any one of claims 3 to 8, wherein the user can transmit information on a channel that the user desires to view to the digital broadcast receiving apparatus.

  According to the present invention, it is possible to provide a portable terminal that can receive a terrestrial digital television broadcast and view the television while moving indoors without cost.

  Embodiments of the present invention will be described below.

(Environment in which the present invention is implemented)
FIG. 1 shows an environment diagram in which the present invention is implemented. The digital broadcast receiver 1 of the present invention is installed indoors in a building 5 (for example, a home). The fixed UHF antenna 3 is installed on the roof of the building 5 and receives a broadcast wave transmitted from a terrestrial digital television broadcast station. The terrestrial digital television broadcast wave signal received by the fixed UHF antenna 3 is sent to the digital broadcast receiver 1 by wire. The digital broadcast receiver 1 extracts a digital terrestrial television broadcast of a channel selected by the user from a digital broadcast wave signal received by the fixed UHF antenna 3, demodulates and decodes the video signal obtained as a result. Send to TV 4. As a result, the user can view a digital terrestrial television broadcast program on the television 4.

  The cellular phone 2 has a UHF antenna, and can receive a terrestrial digital television broadcast wave for a portable receiver and reproduce a terrestrial digital television broadcast program. The cellular phone 2 can decode the terrestrial digital television broadcast signal transferred from the digital broadcast receiver 1 and display the video obtained as a result of the decoding on the display unit. As a result, the user can view the digital terrestrial television broadcast program obtained from the fixed UHF antenna 3 using the mobile phone 2.

  In addition, the digital broadcast receiver 1 of the present invention and the mobile phone 2 can perform wireless communication using Bluetooth or the like. The digital broadcast receiver 1 can transfer the demodulated digital terrestrial television broadcast signal to the mobile phone 2.

  The reception sensitivity of terrestrial digital television broadcast waves by the UHF antenna of the mobile phone 2 is deteriorated indoors. Therefore, indoor digital television broadcast programs may not be viewed indoors by the mobile phone 2. However, as described above, by transferring the terrestrial digital television broadcast signal from the digital broadcast receiver 1 to the mobile phone 2, the user can receive the broadcast for the mobile receiver while moving indoors and watch the television. Will be able to do.

(Configuration of digital broadcast receiver 1)
FIG. 2 shows the configuration of the digital broadcast receiver 1. The digital broadcast receiver 1 includes a tuner 11, a demodulation unit 12, a TS demultiplexer 13 (denoted as TS-Demux in the figure), an MPEG2 decoder 14, a wireless transmission / reception unit 15, an operation unit 16, a CPU 17, a modulation / demodulation unit 18, and the like. is doing.

  The RF signal received by the fixed UHF antenna 3 is input to the tuner 11. In the tuner 11, for example, tuning is performed according to an input from the operation unit 16. In other words, 13 segment broadcast signals (both for the fixed receiver and for the mobile receiver) constituting the channel desired by the user (5.6 MHz band) are extracted.

  The demodulator 12 performs OFDM demodulation on the signal selected by the tuner 11. Specifically, an analog signal is converted into a digital signal, and FFT (Fast Fourier Transform) is performed on the analog signal. Then, demodulation processing (64QAM (Quadrature Amplitude Modulation) demodulation, etc.) is performed, and error correction is performed to generate a TS (Transport Stream) packet signal sent out by the broadcasting station. The demodulator 12 can demodulate both the broadcast signal for the fixed receiver modulated by the 64QAM system and the broadcast signal for the mobile receiver modulated by the QPSK (Quadrature Phase Shift Keying) system. It is.

  A TS demultiplexer (Demultiplexer: separation circuit) 13 separates TS packets according to purpose and performs predetermined processing. Specifically, first, the TS packet is separated into purpose-specific packet signals such as a video stream, an audio stream, a data broadcast stream, and SI (Service Information: program arrangement information) information. The video stream and audio stream packets are sent to the MPEG2 decoder 14. The data broadcast stream packet is sent to the CPU 17. The SI information is processed by the CPU 17 and used for EPG (Electronic Program Guide), channel selection processing, and the like. In addition, when there is a request from the outside (for example, the mobile phone 2), it is also possible to generate a signal for transmitting the video stream and audio stream packets to the outside and output them to the modem unit 18.

  The MPEG2 decoder 14 receives the data stream supplied from the TS demultiplexer 13 and converts it into a video signal and an audio signal. The video signal and audio signal obtained by the conversion are transmitted to the television 4. The user can view digital terrestrial television broadcasting on the television 4.

  The wireless transmission / reception unit 15 performs communication using a wireless signal to the outside. The modem unit 18 performs modulation for generating a signal transmitted from the wireless transmission / reception unit 15, demodulation of a signal received by the wireless transmission / reception unit 15, and the like. For example, the TS packet signal for the mobile receiver obtained by the separation in the TS demultiplexer 13 is modulated into a signal suitable for wireless transmission by the modem unit 18, and is transmitted from the wireless transmission / reception unit 15 to the mobile phone 2 and the like. Can be sent. The radio signal transmitted from the mobile phone 2 is demodulated by the modem unit 18 into a signal that can be decoded by the CPU 17. In the wireless communication between the digital broadcast receiver and the mobile phone 2, for example, the Bluetooth method is used.

  The operation unit 16 is an operation button of the digital broadcast receiver 1 or a remote controller attached to the digital broadcast receiver 1 and receives an input from the user.

(Detailed configuration of tuner 11 and demodulator 12)
FIG. 3 is a diagram illustrating a detailed configuration of the tuner 11 and the demodulation unit 12.

  The tuner 11 includes a frequency conversion unit 8010, an IF filter 8012, a down converter 8015, and the like. The RF signal received by the fixed UHF antenna 3 is input to the frequency conversion unit 8010.

  In frequency converter 8010, the RF signal is down-converted to an intermediate frequency (IF frequency), a desired frequency is extracted by IF filter 8012, and then converted to a baseband signal by down converter 8015. Then, the signal converted into the baseband signal is input to the analog / digital conversion unit 8016 of the demodulation unit 12.

  The analog / digital conversion unit 8016 of the demodulation unit 12 converts an analog signal into a digital signal and uses a Hilbert transform or the like to generate a real axis (hereinafter referred to as “I axis”) component signal (in-phase detection axis signal) and The imaginary axis (hereinafter referred to as “Q axis”) component signal (orthogonal detection axis signal) is output to a fast Fourier transform unit (hereinafter referred to as “FFT unit”) 8017.

  The FFT unit 8017 performs fast Fourier transform on the input signal, converts the time axis data into frequency axis data, and outputs the frequency axis data to the frequency deinterleave unit 8018.

  The frequency deinterleaving unit 8018 performs a process for restoring the frequency interleaving performed to compensate for the loss of a signal of a specific frequency due to radio wave reflection or the like.

  The output of frequency deinterleaving section 8018 is given to time deinterleaving section 8019. Time deinterleaving section 8019 performs a process for returning the time interleaving performed for pair fading and the like.

  The I-axis component signal and the Q-axis component signal subjected to time deinterleaving are converted into 2-bit (QPSK), 4-bit (16QAM) or 6-bit (64QAM) signals in the demapping unit 8020. Each is converted to a signal.

  The signal subjected to the demapping is subjected to bit interleaving performed for the purpose of increasing error resilience by the bit deinterleaving unit 8021, and then the Viterbi decoding unit 8022 uses the convolutional code performed on the transmission side. Perform error correction.

  The signal subjected to Viterbi decoding is subjected to Reed-Solomon decoding (hereinafter referred to as “RS decoding”) after the byte interleaving performed for the purpose of increasing error resilience is canceled by the byte interleaving unit 8023 in the same manner as the bit interleaving unit. The RS decoding unit 8024 performs error correction.

  The signal error-corrected in the RS decoding unit 8024 is input to the TS demultiplexer 13.

  The terrestrial digital broadcast signal includes TMCC (Transmission and Multiplexing Configuration Control) in which transmission method information and the like are described. For example, TMCC includes information indicating whether a broadcast signal is for mobile reception, fixed reception, or which of the 13 segments that make up a broadcast signal of one channel. ing.

  Therefore, for example, a signal for mobile reception can be extracted from the TMCC information, and the extracted signal can be transmitted from the wireless transmission / reception unit 15 to the outside. Alternatively, a signal of the central one segment among the 13 segments may be extracted from the TMCC information, and the extracted signal may be transmitted from the wireless transmission / reception unit 15 to the outside.

  When it is determined that the signal converted into the frequency axis data by the FFT unit 8017 based on the TMCC information extracted by the TMCC decoding unit 8028 is a signal for mobile reception and is QPSK-modulated, the time deinterleaving unit An output from 8019 is converted into a 2-bit signal by a demapping unit 8020. When it is determined that the signal is for fixed reception and subjected to 64QAM modulation, the output from the time deinterleaving unit 8019 is converted into a 6-bit signal by the demapping unit 8020.

(Configuration of TS packet)
Next, a TS packet obtained (reproduced) by demodulation in the demodulation unit 12 will be described. The TS packet is a packet having a fixed length of 188 bytes. A TS packet includes a packet header, an adaptation field, and a payload (data portion). Video signals, audio signals, and the like are transmitted in a payload. The adaptation field stores time information, which is referred to as PCR (Program Clock Reference), which is a reference for one program.

  The payload of the TS contains a program included in the stream and information indicating the configuration of the program. These are called Program Specific Information (PSI), PAT (Program Association Table), PMT (Program Map Table), NIT (Network Information Table), CAT (Cad 4). ing.

  The TS packet signal includes data broadcasting, EPG (Electronic Program Guide), information necessary for channel selection (SI information, PSI information), and the like in addition to video signal and audio signal packets.

  In the MPEG-2 system TS, each multi-program ES (Elementary Stream, elementary stream, data obtained by compressing and encoding audio and video data with MPEG-2), respectively, is a PID (Packet IDentifier, packet identifier). The 13-bit identifier of the TS packet header is assigned. If this PID is between 0x0010 and 0x1FFE (equivalent to 16 to 8190 in hexadecimal notation) in MPEG-2, each ES can be assigned to any PID. However, according to the broadcasting standard for each country, the allocation method of PID to broadcasting stations and the allocation according to the type of ES are determined. For example, different PIDs are allocated to TS packets of video data, audio data, PMT, and PAT, respectively. The TS demultiplexer 13 of the digital broadcast receiver 1 or the TS demultiplexer 23 of the mobile phone 2 to be described later selects and classifies TS packets based on the PID of the TS packet, and performs predetermined processing on each. . For example, if the TS packet is a video data or music data packet, the TS packet is transmitted to the MPEG decoder 14.

  Also, in digital terrestrial television broadcasting, since a plurality of programs can be broadcast simultaneously on one transmission channel, a plurality of programs may be sent as the same TS. However, different PIDs are assigned to the terrestrial digital television broadcast signal for the fixed receiver and the terrestrial digital television broadcast signal for the portable receiver. Therefore, the TS demultiplexer 13 of the digital broadcast receiver 1 outputs the TS packet having the PID of the terrestrial digital television broadcast signal for the portable receiver to the modem unit 18. The TS packet output to the modem unit 18 is transmitted from the wireless transmission / reception unit 15 to the mobile phone 2. As a result, the user of the mobile phone 2 can view the digital terrestrial broadcast program received by the digital broadcast receiving device 1 through the mobile phone 2.

(Configuration of mobile phone 2)
FIG. 4 shows the configuration of the mobile phone 2. The cellular phone 2 includes a tuner 21, a demodulator 22, a TS demultiplexer 23, an H.264 decoder 24, a display unit 25, a wireless transmitter / receiver 26, an operation unit 27, a CPU 28, an antenna 29, an MPEG-AAC decoder 30, a speaker 31, It has a modem unit 32 and the like.

  The antenna 29 receives a terrestrial digital television broadcast wave transmitted from a terrestrial digital television broadcast station. The RF signal received by the antenna 29 is input to the tuner 21. The tuner 21 performs channel selection according to the input from the operation unit 27. The tuner 21 extracts a one-segment broadcast signal arranged in the center from among the 13-segment broadcast signals constituting the channel desired by the user (5.6 MHz band).

  The demodulator 22 performs OFDM demodulation on the signal selected by the tuner 21. More specifically, an analog signal is converted into a digital signal, FFT (Fast Fourier Transform: Fast Fourier Transform) is performed on the analog signal, 64QAM (by, etc.) demodulation is performed, and error correction is performed. A TS (Transport Stream) packet signal sent out by the station is generated.

  The TS demultiplexer 23 separates TS packets by purpose and performs predetermined processing. For example, a packet signal related to video is sent to the H.264 decoder 24. The packet signal related to audio is sent to the MPEG-AAC decoder 30. The data broadcast signal is sent to the CPU.

  The H.264 decoder 24 receives the data stream supplied from the TS demultiplexer 23 and converts it into a video signal. The video signal obtained by the conversion is transmitted to the display unit 25. The user can view digital terrestrial television broadcasting through the display unit 25.

  The MPEG-AAC decoder 30 receives the data stream supplied from the TS demultiplexer 23 and converts it into an audio signal. The audio signal obtained by the conversion is transmitted to the speaker 31.

  The wireless transmission / reception unit 26 communicates with the outside using wireless signals. The modem unit 32 performs modulation for generating a signal transmitted from the wireless transmission / reception unit 26, demodulation of a signal received by the wireless transmission / reception unit 26, and the like. For example, the wireless transmission / reception unit 26 receives a wireless signal of a mobile broadcast digital broadcast TS packet transmitted from the digital broadcast receiver 1, and is demodulated into a signal that can be decoded by the CPU 28 by the modem unit 32. Information input from the operation unit 27 by the user of the mobile phone 2 is modulated into a radio signal by the modem unit 32 and transmitted from the radio transceiver unit 26 to the digital broadcast receiver 1.

  The operation unit 27 is an operation button or the like of the mobile phone 2 and receives an input from the user.

  In the present embodiment, the mobile phone 2 can function as a remote controller for the digital broadcast receiver 1. That is, the user can operate the digital broadcast receiver 1 and send instructions and requests to the digital broadcast receiver 1 by transferring the input signal from the operation unit 27 to the digital broadcast receiver 1. .

(Example of use)
Below, the usage example using the said structure is demonstrated.

  With reference to FIG. 5, the operation in the mobile phone 2 will be described. When the user of the cellular phone 2 selects viewing of the terrestrial digital television broadcast by operating the operation unit 27 (step S01), in step S04, the signal intensity of the terrestrial digital television broadcast wave received by the antenna 29 is measured. If the signal strength is equal to or greater than the predetermined value, it is determined that the reception sensitivity is good, and the terrestrial digital television broadcast signal for the mobile receiver is reproduced based on the broadcast wave received by the antenna 29 (step S06). If the signal strength is less than the predetermined value, it is determined that the reception sensitivity is poor, and the process proceeds to step S08.

  In step S08, it is checked whether or not there is a digital broadcast receiver 1 in the vicinity. Specifically, the wireless signal transmission unit 30 transmits a communication request signal to the digital broadcast receiver 1. When the wireless transmission / reception unit 26 receives a response signal from the digital broadcast receiver 1, the mobile phone 2 recognizes that the digital broadcast receiver 1 is in the vicinity, and proceeds to step S11. When the wireless transmission / reception unit 26 cannot receive the response signal from the digital broadcast receiver 1, a message indicating that the terrestrial digital television broadcast signal cannot be viewed is displayed on the display unit 25 (step S10). ).

  In step S11, a message to request channel selection is displayed on the display unit 25. The user selects a desired channel by operating the operation unit 27.

  In step S <b> 12, a signal requesting to transfer the terrestrial digital television broadcast signal received by the digital broadcast receiver 1 to the mobile phone 2 is transmitted to the digital broadcast receiver 1. At this time, the channel information selected by the operation unit 27 is also transmitted to the digital broadcast receiver 1.

  In step S <b> 13, a message signal indicating whether or not the digital broadcast receiver 1 is in use is transmitted from the digital broadcast receiver 1 and displayed on the display unit 25. If the digital broadcast receiver 1 is in use (yes in step S13), the process proceeds to step S14. If the digital broadcast receiver 1 is not in use (no in step S13), the process proceeds to step S15.

  In step S <b> 14, information regarding the channel being received by the digital broadcast receiver 1 and the program of the channel is transmitted from the digital broadcast receiver 1 and displayed on the display unit 25. When the user of the mobile phone 2 wishes to view the channel being received by the digital broadcast receiver 1 (when the digital broadcast receiver 1 may be viewing the channel being received, yes in step S14). The process proceeds to step S15. If the digital broadcast receiver 1 does not wish to view the channel being received, a message indicating that viewing of the terrestrial digital television broadcast is impossible is displayed on the display unit 25 (step S17).

  In step S15, the TS packet signal transmitted from the digital broadcast receiver 1 is received. This TS packet signal corresponds to the request signal transmitted to the digital broadcast receiver 1 in step S12.

  In step S16, the video packet of the TS packet signal is H.264. The video signal is generated by decoding by the H.264 decoder 24. The audio packet is decoded by the MPEG-AAC decoder 30 to generate an audio signal. In step S18, H.H. The video signal generated by the H.264 decoder 24 is displayed on the display unit 25. The audio signal generated by the MPEG-AAC decoder 30 is output from the speaker 31.

  The above is the operation of the mobile phone 2 in one usage example. In the above description, first, the reception sensitivity of a terrestrial digital television broadcast wave signal is checked. If the reception sensitivity is low, it is checked whether or not the digital broadcast receiver 1 is in the vicinity. Instead, the reception sensitivity of the terrestrial digital TV broadcast wave signal is compared with the reception sensitivity of the radio signal transmitted from the digital broadcast receiver 1 in the vicinity, and the digital broadcast signal is received from the side having the excellent reception sensitivity. You may make it acquire.

  The determination of the reception sensitivity is not limited to that based on the strength of the reception signal of the antenna 29 as described above. For example, it may be based on an error rate.

  Alternatively, based on whether SI (Service Information: Program Sequence Information) information and / or PSI (Program Specific Information: Program Specific Information) information included in the TS packet signal has been acquired (whether it has been correctly decoded), It may be determined. The SI information and PSI information are transmitted with a CRC (Cyclic Redundancy Check) code added in encoding at the broadcasting station. Therefore, it is possible to know whether the SI information and the PSI information are correctly transmitted to the mobile phone 2 by dividing the data including the SI information and the PSI information by the predetermined generator polynomial (on the mobile phone 2 side). For example, if the remainder obtained as a result of division is 0, it is regarded as normal transmission. In this way, a terrestrial digital TV broadcast wave signal is selected based on whether or not any information such as SI information and PSI information has been normally transmitted, or transmitted from a digital broadcast receiver 1 in the vicinity. You may make it determine whether a radio signal is selected.

  Alternatively, any signal may be selected based on an input from the operation unit 27 by the user of the mobile phone 2.

  In the above example, the measurement of the reception sensitivity of the terrestrial digital television broadcast signal is determined based on the intensity of the broadcast wave (RF signal) received by the antenna 29, but the tuner 21 selects the channel. You may determine based on the intensity | strength of a later signal. By doing so, it becomes possible to more accurately determine the reception sensitivity of the signal of the channel desired to be viewed.

  In the above example, the reception sensitivity is described as being measured when the television viewing mode is activated. However, the measurement may be performed continuously during viewing. When it is detected that the reception sensitivity has decreased, it is immediately determined whether to adopt the signal received by the antenna 29 of the mobile phone 2 or the signal from the digital broadcast receiver 1 received by the wireless transmission / reception unit 26 ( It may be adaptively switched. Alternatively, it may be determined which signal is used by measuring reception sensitivity when the power of the mobile phone 2 is turned on.

  In the above example, when the digital broadcast receiver 1 is in use, the user of the mobile phone 2 can view only the program of the channel selected by the digital broadcast receiver 1. The receiver 1 may select a channel by giving priority to an instruction from the mobile phone 2. That is, the mobile phone 2 may serve both as a function of viewing a terrestrial digital broadcast program and a function of a remote control for controlling channel selection in the digital broadcast receiver 1.

  Next, with reference to FIG. 6, the operation | movement in the digital broadcast receiver 1 in the said usage example is demonstrated.

  When there is a transfer request for a terrestrial digital television broadcast signal from the mobile phone 2 (step S30), if the digital broadcast receiver 1 is in use (yes in step S32), the digital broadcast receiver 1 is in use. A message to that effect and information regarding the channel or program being received by the digital broadcast receiver 1 are transmitted to the mobile phone 2 (step S36).

  On the other hand, when the digital broadcast receiver 1 is not in use (no in step S32), a channel according to a request from the mobile phone 2 is selected by the tuner 11, demodulated by the demodulator 12, and TS demultiplexer 13 Thus, the packet signal for the mobile receiver is extracted, and the extracted packet signal is transmitted from the wireless transmission / reception unit 15 to the mobile phone 2 (step S34).

  In step S38, a response (answer) signal from the mobile phone 2 to the signal transmitted to the mobile phone 2 in step S36 is received. If the response from the mobile phone 2 may be viewing of the channel being received by the digital broadcast receiver 1 (yes in step S38), the process proceeds to step S42. If the response from the mobile phone 2 is that the digital broadcast receiver 1 does not wish to view the channel being received (No in step S38), the terrestrial digital TV broadcast signal cannot be transferred to the mobile phone 2. Is sent to the mobile phone 2 (step S40).

  In step S <b> 42, among the broadcast signals of the channels being received by the digital broadcast receiver 1, the TS packet signal related to the mobile broadcast signal is transferred to the mobile phone 2.

(Signal separation at segment level)
In the above embodiment, the digital broadcast receiver 1 separates a packet (1 segment packet) related to a terrestrial digital TV broadcast signal for mobile receivers based on the PID of the TS packet signal and transfers the packet to the mobile phone 2. .

  On the other hand, the digital broadcast receiver 1 may extract a segment related to the terrestrial digital television broadcast signal for mobile receivers based on the TMCC information extracted by the TMCC decoding unit 8028 of the demodulation unit 12. The extracted segment signal (one segment signal for mobile reception) may be transferred to the mobile phone 2.

  For example, the TMCC information extracted by the TMCC decoding unit 8028 shown in FIG. 3 recognizes that the signal converted into frequency axis data by the FFT unit 8017 is a signal for mobile reception, and outputs from the demodulation unit 12 (Output from the RS decoding unit 24) is input to both the TS demultiplexer 13 and the modem unit 18. A signal (corresponding to a TS packet signal) input to the modem unit 18 can be transmitted from the wireless transmission / reception unit 15 to the mobile phone 2. On the other hand, when the signal converted into the frequency axis data by the FFT unit 8017 is recognized as a signal for fixed reception, the output from the demodulator 12 is input to the TS demultiplexer 13, but the modem unit 18 Not entered.

  Instead of transmitting the output from the RS decoding unit 8024 to the mobile phone 2, the output of the FFT unit 8017 may be transmitted to the mobile phone 2, or the output of the demapping unit 24 is transmitted to the mobile phone 2. May be.

(Digital broadcast receiver with multiple tuners)
Since the digital broadcast receiver 1 of the above embodiment has only one tuner, when the digital broadcast receiver 1 is in use, the user of the mobile phone 2 is receiving the digital broadcast receiver 1 You can only watch the channel. Therefore, by providing a plurality of tuners in the digital broadcast receiver 1, even when the digital broadcast receiver 1 is in use, the user of the mobile phone 2 can view a program of a channel desired by the user. . At this time, a channel desired by the user is selected by an unused tuner.
At this time, there may be a plurality of demodulation units 12 or a single demodulation unit 12 that generates a TS packet signal by demodulating a signal received by each tuner 11. When there is one demodulator 12, the demodulator 12 performs processing on the output signals from the respective tuners in a time division manner.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

1 is an environment diagram in which the present invention is implemented. 1 shows a configuration of a digital broadcast receiver 1. 2 is a diagram illustrating a detailed configuration of a tuner 11 and a demodulation unit 12. FIG. The structure of the mobile phone 2 is shown. 4 is a flowchart for explaining an operation in the mobile phone 2. 5 is a flowchart for explaining the operation in the digital broadcast receiver 1.

Explanation of symbols

1 Digital Broadcasting Receiver 2 Mobile Phone 11 Tuner 12 Demodulation Unit 13 TS Demultiplexer 14 MPEG2 Decoder 15 Wireless Transmission / Reception Unit 16 Operation Unit 17 CPU
18 Modulator / Demodulator 21 Tuner 22 Demodulator 23 TS Demultiplexer 24 H.264 Decoder 25 Display Unit 26 Wireless Transmitter / Receiver 27 Operation Unit 28 CPU
29 Antenna 30 MPEG-AAC Decoder 31 Speaker 32 Modulator / Demodulator

Claims (16)

A digital broadcast receiving system comprising a digital broadcast receiving device and a portable terminal capable of communicating with the digital broadcast receiving device,
The digital broadcast receiving apparatus includes:
A first receiver for receiving broadcast waves;
A channel selection unit that extracts a broadcast signal of a predetermined channel from the broadcast wave received by the first reception unit;
A first demodulator that demodulates an output signal of the channel selection unit and outputs a TS packet signal;
An extraction unit for extracting a packet signal for digital broadcast for mobile reception from the TS packet signal obtained by the first demodulation unit;
A modulation unit that modulates the signal extracted by the extraction unit into a predetermined modulation signal;
A transmission unit that transmits the signal modulated by the modulation unit to the mobile terminal,
The portable terminal is
A video / audio output unit for outputting a video signal and / or an audio signal;
A second receiver for receiving a signal from the transmitter of the digital broadcast receiver;
A second demodulator that demodulates the signal received by the second receiver and outputs a TS packet signal;
A digital broadcast receiving system comprising: a video / audio signal generation unit that generates a video signal and / or an audio signal output from the video / audio output unit based on a TS packet signal output from the second demodulation unit.
A digital broadcast receiving system comprising a digital broadcast receiving device and a portable terminal capable of communicating with the digital broadcast receiving device,
The digital broadcast receiving apparatus includes:
A first receiver for receiving broadcast waves;
A first channel selection unit for extracting a broadcast signal of a predetermined channel from the broadcast wave received by the first reception unit;
A first demodulator that demodulates an output signal of the first channel selection unit and outputs a TS packet signal;
An extraction unit for extracting a packet signal for digital broadcast for mobile reception from the TS packet signal obtained by the first demodulation unit;
A modulation unit that modulates the signal extracted by the extraction unit into a predetermined modulation signal;
A transmission unit that transmits the signal modulated by the modulation unit to the mobile terminal,
The portable terminal is
A video / audio output unit for outputting a video signal and / or an audio signal;
A second receiver for receiving a signal from the transmitter of the digital broadcast receiver;
A second demodulator that demodulates the signal received by the second receiver and outputs a TS packet signal;
A third receiver for receiving broadcast waves;
A second channel selection unit that selects a channel from a broadcast wave received by the third reception unit;
A third demodulator that demodulates the output signal of the second channel selector and outputs a TS packet signal;
A selection output unit for selecting and outputting either the TS packet signal obtained by the second demodulation unit or the TS packet signal obtained by the third demodulation unit;
A digital broadcast receiving system comprising: a video / audio signal generation unit that generates a video signal and / or an audio signal output from the video / audio output unit based on a TS packet signal output from the selection output unit.
A first receiver for receiving broadcast waves;
A second receiver for receiving a radio signal including a digital broadcast signal;
A video / audio output unit for outputting a video signal and / or an audio signal;
A channel selection unit that extracts a broadcast signal of a predetermined channel from the broadcast wave received by the first reception unit;
A first demodulator that demodulates an output signal of the channel selection unit and outputs a TS packet signal;
A second demodulator that demodulates a radio signal received by the second receiver and outputs a TS packet signal;
A selection output unit for selecting and outputting either the TS packet signal obtained by the first demodulation unit or the TS packet signal obtained by the second demodulation unit;
A portable terminal comprising: a video / audio signal generation unit that generates a video signal and / or an audio signal output from the video / audio output unit based on a TS packet signal output from the selection output unit.
It has an operation unit that accepts user input,
The mobile terminal according to claim 3, wherein the selection output unit selects a TS packet signal to be output based on an input from the operation unit.
The selection output unit selects a TS packet signal to be output based on a signal strength of a broadcast wave received by the first receiving unit and a signal strength of a radio signal received by the second receiving unit. The mobile terminal according to claim 3.
The selection output unit outputs a TS packet based on whether SI information and / or PSI information included in the TS packet signal obtained by the first demodulation unit and the second demodulation unit has been acquired. The portable terminal according to claim 3, wherein a signal is selected.
The mobile terminal according to claim 3, wherein the selection output unit selects a TS packet signal to be output when the mobile terminal is powered on.
The mobile terminal according to any one of claims 3 to 6, wherein the selection output unit selects a TS packet signal to be output when the TV viewing mode of the mobile terminal is activated.
A receiver for receiving broadcast waves;
A channel selection unit that extracts a broadcast signal of a predetermined channel from the broadcast wave received by the reception unit;
A demodulator that demodulates the output signal of the channel selection unit and outputs a TS packet signal;
An extraction unit that extracts a packet signal for mobile reception digital broadcasting from the TS packet signal obtained by the demodulation unit;
A modulation unit that modulates the signal extracted by the extraction unit into a predetermined modulation signal;
A digital broadcast receiving apparatus comprising: a transmission unit that transmits the signal modulated by the modulation unit to the outside.
A second receiver for receiving a signal from a mobile terminal capable of receiving digital broadcast waves for mobile reception;
When the signal from the mobile terminal received by the second receiving unit is a signal requesting transmission of a digital broadcast signal,
The digital broadcast receiving apparatus according to claim 9, wherein the transmission unit transmits the signal modulated by the modulation unit to the portable terminal.
The digital broadcast receiving apparatus according to claim 9 or 10, wherein if the digital broadcast receiving apparatus is in use, the mobile terminal is notified that the digital broadcast receiving apparatus is in use.
The digital broadcast receiver according to any one of claims 9 to 11, wherein the mobile terminal is notified of information on a channel selected by the digital broadcast receiver.
The digital broadcast receiving apparatus according to claim 11 or 12, wherein the mobile terminal inquires whether or not the user wishes to view a channel selected by the digital broadcast receiving apparatus.
A receiver that receives a signal from a mobile terminal capable of receiving digital broadcast waves for mobile reception;
When the signal from the mobile terminal received by the receiving unit is a signal designating a channel different from the channel selected by the channel selection unit, the channel selection unit prioritizes the signal from the mobile terminal. The digital broadcast receiver according to claim 9, wherein channel selection is performed.
A receiver for receiving broadcast waves;
A first channel selection unit that extracts a broadcast signal of a predetermined channel from a broadcast wave received by the reception unit; and a second channel selection unit;
A first demodulator that demodulates an output signal of the first channel selection unit and outputs a TS packet signal;
A second demodulator that demodulates an output signal of the second channel selection unit and outputs a TS packet signal;
An extraction unit that extracts a digital broadcast packet signal for mobile reception from the TS packet signal obtained by either the first demodulation unit or the second demodulation unit;
A modulation unit that modulates the signal extracted by the extraction unit into a predetermined modulation signal;
A transmission unit that transmits the signal modulated by the modulation unit to the outside,
When the signal from the portable terminal received by the receiving unit is a signal designating a channel different from the channel selected by the channel selecting unit, the first channel selecting unit and the second channel selecting unit are used. A digital broadcast receiver that selects a channel based on a signal from a portable terminal by a channel selection unit that is not in the middle.
A portable terminal capable of communicating with the digital broadcast receiver according to any one of claims 9 to 15,
It has an operation unit that accepts user input,
The mobile terminal according to any one of claims 3 to 8, wherein information regarding a channel that the user desires to view and that is input from the operation unit can be transmitted to the digital broadcast receiving device.

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