JP4688169B2 - Receiving apparatus and receiving method - Google Patents

Description

  The present invention relates to a receiving apparatus and method, and for example, relates to a receiving apparatus and method capable of quickly switching to a desired channel.

  Conventionally, in analog broadcasting, channel selection means performing so-called tuning by matching a reception frequency for receiving a signal transmitted by a broadcast radio wave or the like with a frequency of a desired channel. When the reception frequency matches the carrier frequency of the desired channel, the image and sound of that channel are output almost instantaneously.

  For example, when switching channels in sequence with the +/- key, even when the +/- key is held down, the channel is selected one by one, and the image and sound corresponding to the selected channel are almost instantaneous. Is output. Thus, a desired channel can be selected while viewing the channel number of each channel and the image and sound of that channel.

  Also in digital television broadcasting using satellites, it is conceivable to switch channels in order with the +/− key.

  However, in digital television broadcasting that compresses and transmits images and sounds, it is necessary to expand the compressed images and sounds on the receiving side. For this reason, for example, when the +/− key is continuously pressed, the channels are switched in order, and each time the channel is switched, an image or sound of the switched channel is output, for example, 2 to 3 seconds. There was a problem that required.

  In addition, when channel selection is performed by simply increasing or decreasing the channel number by one, a channel that is not actually being broadcast may be selected, resulting in a problem of poor operability.

  The present invention has been made in view of such a situation, and makes it possible to quickly select a desired channel by a simple key operation.

A receiving apparatus according to an aspect of the present invention includes a receiving unit that receives a transmission signal including a service ID corresponding to a channel number of a channel on which broadcasting is actually performed at a predetermined time, and is included in the received transmission signal Creating means for creating a table in which a plurality of the service IDs are sorted and described in order of size, an updating means for updating the table each time the content of the transmission signal is updated, and a channel to be selected. and the corresponding up-down instruction means for instructing whether the or switch the channel number increases directions, or switched in a direction to reduce, to select the said channel in response from a plurality of the channels of the indication by the up-down instruction means Switching in the direction of increasing the channel number by the channel selection means and the up / down instruction means Is not instructed, it is determined whether switching of the direction for decreasing the channel number is instructed. When switching of the direction for decreasing the channel number is not instructed, switching of the direction of increasing the channel number is performed. By determining whether the channel number has been instructed, it is determined which of the two directions is the channel number switching direction. The service ID stored in the pointer having a value obtained by changing the pointer value of the table storing the service ID corresponding to the channel number of the channel by 1 corresponding to the designated switching direction. It generates OSD data of the channel number corresponding to the to display the image of the channel received Is displayed on the display unit, at a predetermined position on the up-down instruction means according to the channel of a program that has been received immediately before the instruction of switching is performed image, the channel number of the generated said OSD data is causes display so as to superimpose the said in the state where the channel number is displayed in the OSD data, or instruction by the up-down instruction means is carried out continuously, the user's finger with respect to the up-down instruction means determined based on whether or not the pressing operation has been completed by, when said pressing operation by a user's finger is not completed, that corresponds to the direction of the switching is changed by 1 the value of the pointer, the The program of the channel received immediately before the switching instruction by the up / down instruction means is executed When the channel number of the OSD data displayed so as to be superimposed on the predetermined position on the image of the user is sequentially changed and the pressing operation by the user's finger is finished, the OSD data displayed at that time The channel selection corresponding to the channel number is started, and until the channel selection is started, the channel received immediately before the switching instruction by the up / down instruction unit is executed is received. Control means for controlling the channel selection means.

In response to an instruction from the up / down instruction unit , a channel number display unit as the display unit for displaying the predetermined channel number may be further provided.

Can be made to cause further comprising a storage means for storing the channel number of each channel, the said channel number display means, in accordance with an instruction from the up-down instruction means, said channel being stored in said storage means A predetermined number can be displayed.

The storage means may be adapted based on the information representing the receivable the channels included in the transmission signal, and stores the channel number corresponding to the receivable said channel.

  The storage means may store the channel numbers in order of the channel number size.

A receiving method according to one aspect of the present invention includes a receiving means, a creating means, an updating means, an up / down instruction means, a channel selection means, and a control means, and the receiving means is actually broadcasted. A transmission signal including a service ID corresponding to a channel number of a certain channel is received every predetermined time, and the creating means sorts the plurality of service IDs included in the received transmission signal in order of size. create a description with the table, the update unit, the table is updated each time the contents of the transmission signal is updated, the up-down instruction means, the direction to increase the channel number corresponding to the channel to be selected The channel selection means uses the up / down instruction means from the plurality of channels. The channel is selected according to the indication, and the control means is instructed to switch the direction of decreasing the channel number when the up / down instruction means is not instructed to switch the direction of increasing the channel number. If switching of the direction of decreasing the channel number is not instructed, it is determined whether switching of the direction of increasing the channel number is instructed, so that the switching direction of the channel number is two. A pointer of a table in which the service ID corresponding to the channel number of the channel being received is stored when it is determined which of the directions and switching to any direction is instructed The value of the poi is changed by 1 corresponding to the indicated switching direction. Generates OSD data of the channel number corresponding to the service ID stored in the data are displayed on the display unit for displaying an image of the channel received, instruction execution switching by the up-down instruction means The channel number of the generated OSD data is displayed so as to be superimposed on a predetermined position on the image of the program of the channel received immediately before the channel is displayed, and the channel number of the OSD data is displayed. In the state where the instruction by the up / down instruction means is continuously performed based on whether or not the pressing operation by the user's finger to the up / down instruction means is completed, and the user's finger If the pressing operation by is not completed, the value of the pointer corresponding to the switching direction The Varying one, said an instruction of switching by the up-down instruction means is displayed so as to be superimposed on the predetermined position on the image of the program of the channel received just before the run When the channel number of the OSD data is sequentially changed and the pressing operation by the user's finger is completed, the channel selection corresponding to the channel number of the OSD data displayed at that time is started , and the channel selection is performed. Until the channel is started, the channel selection unit is controlled to receive the channel received immediately before the switching instruction by the up / down instruction unit is executed .

In one aspect of the present invention, a transmission signal including a service ID corresponding to a channel number of a channel on which broadcasting is actually performed is received every predetermined time, and the plurality of services included in the received transmission signal creates a table that describes sorts the ID in the order of magnitude, whether the said table is updated each time the contents of the transmission signal is updated, switch the direction of increasing the channel number corresponding to the channel to be selected If the channel is selected according to the instruction from among the plurality of channels, and the switching of the direction to increase the channel number is not instructed, the channel number is set. It is determined whether switching of the direction to decrease is instructed, and the channel number is decreased. If the direction switching is not instructed, it is determined whether the direction of increasing the channel number is instructed, so that which of the two directions is the channel number switching direction is determined. If it is determined and switching to any direction is instructed, the pointer value of the table storing the service ID corresponding to the channel number of the channel being received is set in the instructed switching direction. Correspondingly, the OSD data of the channel number corresponding to the service ID stored in the pointer of the value changed by 1 is generated and displayed on the display unit for displaying the received image of the channel . The channel number received immediately before the switching instruction by the up / down instruction means is executed. At a predetermined position on the image, while being displayed so as to superimpose the channel number of the generated said OSD data, said in the state where the channel number is displayed in the OSD data, an instruction is continuously rows Is determined based on whether or not the pressing operation with the user's finger has been completed, and if the pressing operation with the user's finger has not ended, the value of the pointer is set corresponding to the switching direction. The OSD displayed so as to be superposed on the predetermined position on the image of the program of the channel received immediately before the switching instruction by the up / down instruction unit is executed by changing by one. is the channel number is sequentially changed data, when said pressing operation by a user's finger has been completed, before being displayed at that time The channel selection corresponding to the channel number of the OSD data is started , and the channel received immediately before the switching instruction by the up / down instruction means is executed until the channel selection is started. Controlled to be received .

  According to the receiving apparatus and the receiving method of one aspect of the present invention, when the instruction unit is continuously pressed down and the channel switching is continuously instructed, the corresponding operation is performed after the pressing operation of the instruction unit is completed. Since channel selection is started, a desired channel can be selected quickly.

  FIG. 1 shows a configuration example of an AV (Audio Video) system to which the present invention is applied. In this embodiment, the AV system is an IRD (Integrated Receiver / Decoder) that demodulates a signal received by a parabolic antenna 1 from a radio wave transmitted from a transmitting device (not shown) via a satellite (broadcast satellite or communication satellite). ) 2 and a television receiver 3.

  A command can be input to the IRD 2 (or the television receiver 3) by an infrared (IR) signal by the remote commander 6. That is, when a predetermined switch of the remote commander 6 is operated, the corresponding IR signal is emitted from the IR signal transmitting unit 72 (FIG. 4) and incident on the IR signal receiving unit 54 (FIG. 2) of the IRD2. It is made like that.

  The IRD 2 supplies its output to the television receiver 3 via an AV line 4 constituted by, for example, three lines of a composite video signal line, an audio L signal line, and an audio R signal line. Further, the IRD 2 has an AV device control signal transmission / reception unit 2A, and the television receiver 3 has an AV device control signal transmission / reception unit 3A. These are connected to each other by a control line 5 made of wired SIRCS (Wired Sony Infrared Remote Control System) (trademark).

  FIG. 2 shows a configuration example of the front of the IRD 2. A lid 52 is provided at the center of the casing 51 so as to be freely opened and closed so that the IC card 33 can be mounted therein. A power key 53 is provided on the left side of the IRD 2. The power key 53 is operated when the power is turned on or off. Below the power key 53, an IR signal receiving unit 54 for receiving an IR signal from the remote commander 6 is provided.

  The LED 55 is turned on when a predetermined message is transmitted to the IRD 2 via a satellite. When the user outputs this message to the television receiver 3 for display and confirms this, the LED 55 is turned off. An LED 56 disposed below the LED 55 is lit when the IRD 2 is communicating via a telephone line.

  The program guide key 57 and the menu key 58 are operated when displaying an electronic program guide or menu on the television receiver 3, respectively.

  Up key 61, down key 62, left key 63, and right key 64 are annularly arranged on the upper, lower, left and right sides of the determination key 65. The up key 61, the down key 62, the left key 63, and the right key 64 (hereinafter, these keys are also referred to as direction keys as appropriate) are operated when the cursor is moved in the vertical and horizontal directions. The determination key 65 is operated when selecting (selecting) selection. The channel up key 59 and the channel down key 60 are operated when the received channel is up or down.

  FIG. 3 shows an internal configuration example of the IRD 2. An RF signal output from an LNB (Low Noise Block downconverter) 1a of the parabolic antenna 1 is supplied to the tuner 21 of the front end 20 (receiving means) and demodulated. The output of the tuner 21 is supplied to the QPSK demodulating circuit 22 and QPSK demodulated. The output of the QPSK demodulator circuit 22 is supplied to an error correction circuit 23, where an error is detected and corrected, and is corrected as necessary.

  An IC card 33 composed of a CPU, a ROM, a RAM, and the like stores a key necessary for decrypting a cipher together with a decryption program. When a signal transmitted via a satellite is encrypted, a key and a decryption process are required to decrypt the encryption. Therefore, this key is read from the IC card 33 via the card reader interface 32 and supplied to the demultiplexer 24. The demultiplexer 24 uses this key to decrypt the encrypted signal.

  The IC card 33 stores accounting information as well as keys and decryption programs necessary for decryption.

  The demultiplexer 24 receives a signal output from the error correction circuit 23 of the front end 20 and temporarily stores it in a data buffer memory (DRAM (Dynamic Random Access Memory) or SRAM (Static Random Access Memory)) 35. Then, this is read out as appropriate, the decoded video signal is supplied to the MPEG video decoder 25, and the decoded audio signal is supplied to the MPEG audio decoder 26.

  The MPEG video decoder 25 appropriately stores the input digital video signal in the DRAM 25a, and executes a decoding process of the video signal compressed by the MPEG method. The decoded video signal is supplied to the NTSC encoder 27 and converted into an NTSC luminance signal (Y), chroma signal (C), and composite signal (V). The luminance signal and the chroma signal are respectively output as S video signals via the buffer amplifiers 28Y and 28C. The composite signal is output from the buffer amplifier 28V via the AV line 4.

  As the MPEG video decoder 25, an MPEG2 decoding LSI (STi3500) manufactured by SGS-Thomson Microelectronics can be used. The outline is introduced by Mr. Martin Bolton on pages 101 to 110 of Nikkei BP "Nikkei Electronics" 1994.14 (no. 603), pages 101 to 110, for example.

  MPEG2-Transportstream is described in pages 231 to 253 of “Latest MPEG Textbook” issued on August 1, 1994 by ASCII Corporation.

  The MPEG audio decoder 26 appropriately stores the digital audio signal supplied from the demultiplexer 24 in the DRAM 26a, and executes the decoding process of the audio signal compressed by the MPEG method. The decoded audio signal is D / A converted by the D / A converter 30, the left channel audio signal is output from the buffer amplifier 31L via the AV line 4, and the right channel audio signal is output from the buffer amplifier 31R. Are output via the AV line 4.

  The RF modulator 41 converts the composite signal output from the NTSC encoder 27 and the audio signal output from the D / A converter 30 into an RF signal and outputs the RF signal. In addition, when the TV mode is set, the RF modulator 41 passes an NTSC RF signal input from an AV device such as a cable box to the VCR or other AV device (none of which is shown). Output as is.

  In the case of this embodiment, these video signals and audio signals are supplied to the television receiver 3 via the AV line 4.

  A CPU (Central Processing Unit) 29 (channel number display means, channel selection means) executes various processes in accordance with programs stored in the ROM 37. For example, the tuner 21, the QPSK demodulation circuit 22, the error correction circuit 23, and the like are controlled. Further, the AV device control signal transmission / reception unit 2A is controlled, and a predetermined control signal is output to another AV device (in this embodiment, the television receiver 3) via the control line 5. Receive control signals from AV equipment.

  A predetermined command can be directly input to the CPU 29 by operating various keys (FIG. 2) on the front panel 40. When the remote commander 6 (FIG. 4) is operated, an IR signal is emitted from the IR signal transmission unit 72, the IR signal is received by the IR signal reception unit 39, and the light reception result is supplied to the CPU 29. Accordingly, a predetermined command can be input to the CPU 29 also by operating the remote commander 6.

  Further, the demultiplexer 24 takes in EPG (Electrical Program Guide) data and the like in addition to the MPEG video data and audio data supplied from the front end 20 and supplies them to the EPG area 35A of the data buffer memory 35 for storage. EPG information is information about programs of each broadcast channel up to 24 hours after the current time (in the case of EPG2 and EPG1-2) or 150 hours later (in the case of EPG2, EPG3, EPG1-2, and EPG1-3) (for example, In addition to the still image of the program, channel, broadcast time, title, category, etc.) are included. Since this EPG information is frequently transmitted, the latest EPG can always be held in the EPG area 35A.

  In an EEPROM (Electrically Erasable Programmable Read Only Memory) 38, data (for example, reception history for 4 weeks of the tuner 21 and the channel number received immediately before a predetermined operation is performed) are stored after the power is turned off. Last channel)) and the like are stored as appropriate. This memory is used, for example, when the same channel as the last channel is received again when the power is turned on. When the last channel is not stored, the channel stored as a default in the ROM 37 is received.

  Further, when the sleep mode is set, the CPU 29 operates the minimum circuits such as the front end 20, the demultiplexer 24, and the data buffer memory 35 even when the power is off, and is included in the received signal. The current time is counted from the time information, and control for causing each circuit to perform a predetermined operation at a predetermined time is also executed. For example, timer automatic recording is executed in conjunction with an external VCR.

Furthermore, the CPU 29 controls the MPEG video decoder 25 when it is desired to generate predetermined OSD (On-Screen Display) data. In response to this control, the MPEG video decoder 25 generates predetermined OSD data , writes it to the OSD area of the DRAM 25a, reads it out, and outputs it. As a result, predetermined characters, figures, images (for example, characters, symbols, icons, screens superimposed on a normal screen in FIGS. 5 to 7), etc. are appropriately output to the television receiver 3 for display. Can do.

  The SRAM 36 is used as a work memory for the CPU 29. The modem 34 exchanges data via a telephone line under the control of the CPU 29.

  FIG. 4 shows a configuration example of the remote commander 6. An IR signal transmitter 72 for generating an IR signal corresponding to the operation of various keys is provided at the upper part. The power key 73 is operated when the power of the IRD 2 is turned on or off, and the television power key 74 is operated when the power of the television receiver 3 is turned on or off. The mute key 75 is operated when the audio signal is muted or unmuted. The switch key 76 is operated when the IRD 2 is remotely controlled by the remote commander 6, and the switch key 77 is operated when the television receiver 3 is remotely operated by the remote commander 6.

  The input switching key 78 is operated when switching the input to the IRD 2 or the television receiver 3. The screen display key 79 is operated to switch a state in which characters of a predetermined electronic program guide are displayed on the television receiver 3. The dual voice key 80 is operated when switching a plurality of channels as voice channels.

  The numeric keypad 81 is operated when inputting numbers from 0 to 9. The number 0 key and the “channel selection” key are operated when the number 10 or 12 is input, and the key arranged between the two is operated when the number 11 is input.

  The menu key 82 is operated when displaying a menu, and the promotion key (promo key) 83 is operated when displaying a promotion channel. The program explanation key 84 is operated to display program explanation information in the electronic program guide. The multi key 85 is operated as an electronic program guide when displaying a reduced screen of each broadcast channel on one screen as, for example, 4 × 4 multi screens. The program guide key 86 is operated when displaying an electronic program guide. The jump key 87 is operated when shifting to the last channel.

  An up key 88, a down key 89, a left key 90, and a right key 91 (these keys are also referred to as direction keys as appropriate hereinafter) are operated to move the cursor in the vertical and horizontal directions, respectively. The arranged decision key 92 is operated when inputting a decision of selection. The channel up / down key 94 (instruction means) is operated when incrementing or decrementing the received channel by one. The up key 88, down key 89, left key 90, right key 91, and enter key 92 are an up key 61, a down key 62, a left key 63, a right key 64 and a enter key provided in the main body of the IRD 2 shown in FIG. It corresponds to the key 65, and its arrangement shape also corresponds. The channel up / down key 94 corresponds to the channel up key 59 and the channel down key 60 of FIG.

  The volume up / down key 93 is operated when the volume is increased or decreased by a certain amount.

  Next, the basic operation will be described. When the user operates, for example, the numeric keypad 81 of the remote commander 6 to input a predetermined channel number, an IR signal corresponding to the input number is output from the IR signal transmission unit 72. This IR signal is received by the IR signal receiver 39 of IRD2. When receiving a signal corresponding to the IR signal from the IR signal receiving unit 39, the CPU 29 controls the tuner 21 to receive the channel corresponding to the input number.

  The tuner 21 demodulates the signal corresponding to the channel number designated by the CPU 29 from the signal supplied from the LNB 1 a and outputs the demodulated signal to the QPSK demodulation circuit 22. The signal QPSK demodulated by the QPSK demodulator 22 is further input to the error correction circuit 23, subjected to error correction processing, and then input to the demultiplexer 24. In the demultiplexer 24, the input data is separated into video data and audio data, and the video data is supplied to the MPEG video decoder 25 and the audio data is supplied to the MPEG audio decoder 26, respectively. The MPEG video decoder 25 decodes the input video data by the MPEG method and then outputs it to the NTSC encoder 27. The NTSC encoder 27 converts the input video data into an NTSC video signal. This video signal is supplied to the television receiver 3 via the AV line 4 as a composite video signal via the amplifier 28V, for example.

  Also, the MPEG audio decoder 26 decodes the input audio data by the MPEG method and outputs it to the D / A converter 30. The D / A converter 30 performs D / A conversion on the input audio data, and outputs it as left and right analog audio signals via the amplifiers 31L and 31R. This audio signal is also output to the television receiver 3 via the AV line 4. In this way, the image and sound of the program instructed by the user operating the remote commander 6 are output to the television receiver 3.

  In addition, when the demultiplexer 24 detects EPG data from the received signal, the demultiplexer 24 supplies the EPG data to the data buffer memory 35, and stores the EPG area 35A on the data buffer memory 35.

  When a predetermined key of the remote commander 6 is operated to read out the EPG information, the CPU 29 reads out the EPG data stored in the EPG area 35A and converts it into the MPEG video decoder 25 and converts it into OSD data. Let The OSD data is output to the NTSC encoder 27, and is superimposed on an image of a normal program and output.

  In digital satellite broadcasting, NIT (Network Information Table) is transmitted in addition to data corresponding to the original program. FIG. 5 shows a configuration example of this NIT. The version_number indicates the version of this NIT. For example, the version number is incremented by 1 each time the content is updated. An arbitrary descriptor () can be described in the NIT.

  FIG. 6 shows an example of service_list_descriptor in descriptor (). Descriptor_tag describes data indicating service_list_descriptor. service_id corresponds to the channel number, and service_type represents the type of program of the channel. Therefore, for example, service_type corresponding to television, radio, mosaic promotion, promotion, or data is described.

  Next, a method for operating the channel up / down key 94 to switch channels and select a desired channel will be described with reference to the flowchart of FIG.

  First, in step S1, the CPU 29 acquires service_list_descriptor from the NIT and creates a service table. In digital satellite broadcasting, the above-described data called NIT is transmitted, for example, every 0.1 second. The CPU 29 acquires the service_list_descriptor in the NIT for each transponder and creates a service table by listing the service_list_descriptor. In the service table, service_id (channel number) is described in the order of transmission. Therefore, service_id is not necessarily described in the order of size. This service table is supplied to and stored in the EEPROM 38, for example.

  For example, the service table is updated every time the version_number of the NIT is changed. Thereby, it is possible to always describe only the channel number of the channel on which broadcasting is actually performed.

  In step S2, the CPU 29 determines whether the “+” portion of the channel up / down key 94 (hereinafter referred to as “channel + key 94” as appropriate) has been pressed. If it is determined that the channel + key 94 has been pressed, the process proceeds to step S3, where the service_id, which is larger than the service_id currently selected from the service table stored in the EEPROM 38, is the closest value to the service_id. Searched.

  On the other hand, if it is determined in step S2 that the channel + key 94 has not been pressed, the process proceeds to step S4, and the "-" portion of the up / down key 94 (hereinafter referred to as the channel-key 94 as appropriate) is pressed. It is determined whether or not. If it is determined that the channel-key 94 has been pressed, the process proceeds to step S5, where the service_id, which is smaller than the service_id currently selected from the service table stored in the EEPROM 38, is the closest value to the service_id. Searched.

  If it is determined in step S4 that the channel key 94 has not been pressed, the process returns to step S2, and the processes in and after step S2 are repeatedly executed.

  When either the process in step S3 or the process in step S5 is completed, the process proceeds to step S6, and the CPU 29 instructs the MPEG video decoder 25 to generate and display OSD data corresponding to the searched service_id. . The MPEG video decoder 25 generates OSD data corresponding to the searched service_id in accordance with a command from the CPU 29, writes it in the OSD area of the DRAM 25a, reads it out, and outputs it. Thereby, service_id (channel number) is displayed at a predetermined position on the screen of the television receiver 3.

  Next, in step S7, the CPU 29 determines whether or not the operation of the channel up / down key 94 is finished. That is, it is determined whether or not the user's finger or the like that has pressed the channel up / down key 94 is released and the operation is completed. When it is determined that the channel up / down key 94 continues to be pressed and the operation has not ended, the process returns to step S2, and the processes in and after step S2 are repeatedly executed. As a result, only the channel number displayed on the screen changes at high speed.

  On the other hand, if it is determined in step S7 that the user's finger or the like that has pressed the channel up / down key 94 is released and the operation is completed, the process proceeds to step S8, and the channel selection process is started. In the channel selection process here, confirmation of CA (Conditional Access) conditions and decoding of MPEG data are performed.

  In order to select a digital satellite broadcast, it is necessary to satisfy the conditions of CA. Therefore, under the control of the CPU 29, the data recorded on the IC card 33 issued at the time of contract is read to confirm the conditions. It is determined whether the condition is satisfied. The decoding of the MPEG data is the same as the case where the predetermined channel number is directly input by operating the numeric keypad 81 of the remote commander 6 described above, and the description thereof is omitted here.

  As described above, when the channel up / down key 94 is continuously operated, the channel number is changed at high speed, and the channel selection is started for the first time when the operation of the channel up / down key 94 is completed. Therefore, the user can recognize that the key operation has been accepted with certainty. In addition, the response of key reception is fast and easy for the user to use.

  In addition, when changing the channel number, the service table is searched and only the channel numbers existing there are displayed, so channels that are not currently being broadcast are selected, and a message such as "There is no corresponding channel" appears on the screen. Disappears.

  As described above, the service table can be created by describing the received service_id in the service table in the order of transmission by the transmission side, or by sorting the received service_id in the service_id and then describing the service_id in the service table. is there.

  In the following, referring to the flowchart of FIG. 8, when the received service_id is sorted in the order of the size of the service_id and then described in the service table, the channel up / down key 94 is operated to switch the channel, A method for selecting a desired channel will be described.

  First, in step S11, the CPU 29 acquires service_list_descriptor from the NIT and creates a service table. In this case, the received service_ids are sorted in order of size. That is, service_id is arranged in the order of the size in the service table. This service table is supplied to and stored in the EEPROM 38, for example. Further, as described above, the service table is updated at a predetermined timing.

  In step S12, the CPU 29 determines whether the "+" portion (channel + key 94) of the channel up / down key 94 has been pressed. If it is determined that the channel + key 94 has been pressed, the process proceeds to step S13, where the CPU 29 sets a pointer indicating the storage area in which the currently selected service_id is stored from the service table stored in the EEPROM 38. Increment only. Then, the service_id stored in the area indicated by the pointer incremented by 1 is acquired.

  As described above, since the service_id is stored in the order of size, the next largest service_id can be acquired by incrementing the pointer by 1 and acquiring the service_id of the area indicated by the pointer. .

  On the other hand, if it is determined in step S12 that the channel + key 94 has not been pressed, the process proceeds to step S14. In step S14, it is determined whether or not the "-" portion (channel-key 94) of the channel up / down key 94 has been pressed. If it is determined that the channel-key 94 has been pressed, the process proceeds to step S15, where the CPU 29 sets a pointer indicating the storage area where the currently selected service_id is stored from the service table stored in the EEPROM 38. Just decrement. Then, the service_id stored in the area indicated by the pointer decremented by 1 is acquired.

  If it is determined in step S14 that the channel key 94 has not been pressed, the process returns to step S12, and the processes in and after step S12 are repeatedly executed.

  When either the process in step S13 or the process in step S15 is completed, the process proceeds to step S16, and the CPU 29 instructs the MPEG video decoder 25 to generate and display OSD data corresponding to the acquired service_id. The MPEG video decoder 25 generates OSD data corresponding to the acquired service_id in accordance with a command from the CPU 29, writes it in the OSD area of the DRAM 25a, and further reads and outputs it. Thereby, service_id (channel number) is displayed at a predetermined position on the screen of the television receiver 3.

  Next, in step S17, the CPU 29 determines whether or not the operation of the channel up / down key 94 is finished. That is, it is determined whether or not the user's finger or the like that has pressed the channel up / down key 94 is released and the operation is completed. If it is determined that the channel up / down key 94 continues to be pressed and the operation has not ended, the process returns to step S12, and the processes after step S12 are repeatedly executed. As a result, only the channel number displayed on the screen changes at high speed.

  On the other hand, when it is determined in step S17 that the user's finger or the like that has pressed the channel up / down key 94 is released and the operation is completed, the process proceeds to step S18, and the channel selection process is started. The channel selection process here is the same as that in step S8 in FIG.

  In this way, when the channel up / down key 94 is operated continuously, the channel number displayed on the screen changes at high speed and is displayed on the screen for the first time when the operation of the channel up / down key 94 is completed. Channel selection corresponding to the current channel number is started. Therefore, the response of the key reception is fast, it can be recognized that the key operation is reliably received, and it is easy for the user to use.

  Further, when the channel number is changed, the service_id stored in the service table is acquired and displayed, so that the service_id not described in the NIT service_list_descriptor is not selected. As a result, a channel that is not currently being broadcast is selected, and a message such as “no corresponding channel” is displayed on the screen.

  In addition, by sorting the service_id of the service table in order of size, when changing the channel number, there is no need to sequentially search for the next channel number in the service table, and the channel number can be increased at high speed. The display of can be changed.

  As a result, it is possible to easily and quickly select a digital satellite broadcast composed of several hundred channels.

It is a block diagram which shows the structural example of the AV system to which this invention is applied. It is a figure which shows the structural example of the front of IRD2 of FIG. It is a block diagram which shows the example of an internal structure of IRD2 of FIG. It is a figure which shows the structural example of the remote commander 6 of FIG. It is a figure which shows the structural example of NIT. It is a figure which shows the structural example of service_list_descriptor. It is a flowchart explaining the example of a process in the case of tuning using the channel up / down key 94. 12 is a flowchart for explaining another example of processing when a channel is selected using a channel up / down key 94.

Explanation of symbols

  1 parabolic antenna, 2 IRD, 3 television receiver, 6 remote commander, 21 tuner, 23 error correction circuit, 24 demultiplexer, 25 MPEG video decoder, 25a DRAM, 26 MPEG audio decoder, 26a DRAM, 29 CPU, 35 data Buffer memory, 35A EPG area, 36 SRAM, 37 ROM, 38 EEPROM, 39 IR signal receiver

Claims (6)

Receiving means for receiving a transmission signal including a service ID corresponding to a channel number of a channel on which broadcasting is actually performed at predetermined time intervals;
Creating means for creating a table in which the plurality of service IDs included in the received transmission signal are described by sorting in order of size;
Updating means for updating the table each time the content of the transmission signal is updated;
And up-down instruction means for instructing whether switching to a direction or switch in the direction of increasing the channel number corresponding to the channel to be selected, or smaller,
Channel selection means for selecting the channel according to an instruction from the up / down instruction means from among the plurality of channels;
If the up / down instruction means has not instructed switching of the direction to increase the channel number, it is determined whether switching of the direction of decreasing the channel number has been instructed, and switching of the direction of decreasing the channel number is instructed. If not, it is determined which of the two directions the channel number switching direction is determined by determining whether switching of the channel number increasing direction is instructed. When switching to the direction of the channel is instructed, the value of the pointer in the table storing the service ID corresponding to the channel number of the channel being received is set to 1 corresponding to the instructed switching direction. the switch corresponding to the service ID in the pointer changes the value were stored It generates OSD data tunnel number are displayed on the display unit for displaying an image of the channel received, the up-down instruction means by switching the indication of the channel of a program which has been received immediately before being executed In a state where the channel number of the generated OSD data is superimposed on a predetermined position on the image, and the channel number of the OSD data is displayed, an instruction from the up / down instruction unit is given. It is determined based on whether or not the pressing operation with the user's finger on the up / down instruction means has been completed, and when the pressing operation with the user's finger has not ended, the switching is performed. by changing one of the value of the pointer in response to direction, the up-down instruction means According instruction switching so that sequentially changes the channel number of the OSD data being displayed so as to be superimposed on the predetermined position on the image of the program of the channel received just before the execution, the user When the pressing operation with the finger is finished, the channel selection corresponding to the channel number of the OSD data displayed at that time is started, and until the channel selection starts , the up / down instruction means And a control unit that controls the channel selection unit so that the channel received immediately before the switching instruction is executed is received. The receiving apparatus according to claim 1, further comprising: a channel number display unit as the display unit that displays the predetermined channel number in response to an instruction from the up / down instruction unit. Further comprising a storage means for storing the channel number of each channel,
The receiving apparatus according to claim 2, wherein the channel number display means displays a predetermined one of the channel numbers stored in the storage means in accordance with an instruction from the up / down instruction means. Wherein the storage unit, the receiving apparatus according to claim 3 for storing the channel number on the basis of the information representing the receivable the channels included in the transmission signal, corresponding to the receivable said channel. The receiving device according to claim 4, wherein the storage unit stores the channel numbers in order of the size of the channel numbers. In the receiving method of the receiving device,
Receiving means;
Creating means;
Update means;
Up-down instruction means;
Channel selection means,
Control means, and
The receiving means receives a transmission signal including a service ID corresponding to a channel number of a channel on which broadcasting is actually performed at predetermined time intervals,
The creating means creates a table in which a plurality of the service IDs included in the received transmission signal are sorted and described in order of size,
The updating means updates the table every time the content of the transmission signal is updated,
The up-down instruction means instructs whether switch to the or switch the channel number increases directions, or to reduce the direction corresponding to the channel to be selected,
The channel selection means selects the channel according to an instruction from the up / down instruction means from among the plurality of channels,
The control means determines whether switching of the direction of decreasing the channel number is instructed when the switching of the direction of increasing the channel number is not instructed by the up / down instruction means, and decreases the channel number. If direction switching is not instructed, it is determined which of the two directions the channel number switching direction is by determining whether switching of the channel number increasing direction is instructed. If switching is determined in any direction, the pointer value in the table storing the service ID corresponding to the channel number of the channel being received is set in the specified switching direction. The service ID stored in the pointer correspondingly changed by 1 Generates OSD data of the corresponding channel numbers, the channel received just before being displayed on the display unit for displaying an image of the channel received, indication of switching by the up-down instruction unit is performed The channel number of the generated OSD data is displayed so as to be superimposed on a predetermined position on the image of the program , and the up / down instruction means is displayed in a state where the channel number of the OSD data is displayed. Is determined based on whether or not the pressing operation by the user's finger to the up / down instruction means has been completed, and the pressing operation by the user's finger has not been completed, in response to the direction of the switching by changing one of the value of the pointer, the up Sequentially changing the channel number of the OSD data being displayed so as to be superimposed on the predetermined position on the image of the program of the channel received just before the switching instruction is executed by the down instruction means, When the pressing operation by the user's finger is completed, the channel selection corresponding to the channel number of the OSD data displayed at that time is started, and the up / down instruction is issued until the channel selection is started. A receiving method for controlling the channel selecting means to receive the channel received immediately before the switching instruction by the means is executed .

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