JP2000124823A - Broadcasting receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To to output services at a point of time, when a desired service exists by switching a switching means and outputting a second service of a second reception means at the time of broadcasting block detection of a first signal at a first reception means. SOLUTION: When a digital audio broadcasting(DAB) tuner part 9 receives a DAB signal, a control part 4 extracts all the services that can be received by this frequency from high-speed information channel of the DAB signal which is demodulated at a DAB signal demodulation part 10, and stores ID information and FI information of the services in a second memory. The control part 4 extracts information regarding simultaneous broadcasting from the FI information, controls a phase-locked loop(PLL) circuit of an FM/AM tuner part 12 at an FM/AM signal processing part 3, receives the simultaneous broadcasting of an FM or AM signal corresponding to respective services of the DAB signal, and demodulates simultaneous broadcasting at the FM/AM signal demodulation part 13. The control part 4 switches a switching part 5 and successively outputs the corresponding FM or AM signal to the simultaneous broadcasting from a speaker 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcast receiving apparatus for receiving a digital broadcast or the like.

[0002]

2. Description of the Related Art Digital audio broadcasting (DAB: Digital Audio Broadcastin) actually broadcasted in Europe and the like.
Digital broadcasting, such as g), makes use of the characteristics of digital signals and makes it difficult to realize analog signals. It is difficult to be affected by multipath and fading. The use is possible.

[0003] DAB is a European communication standard, E.
In the TS (European Telecommunication Standard), it is standardized by “ETS 300 401”.

FIG. 5 is a schematic diagram showing a frame structure of a DAB signal. The DAB signal is provided in a frame unit, and as shown in FIG.
on Frame) is composed of three channels. That is, the transmission frame is a synchronization channel (Synchronization Channel) composed of a null symbol and a phase reference symbol having a known value as a synchronization signal of the transmission frame.
l), a high-speed information channel (FIC: Fast Information Channel) for high-speed data transfer without time interleaving such as multiplex configuration information and service classification.
l) and main and time-interleaved services such as voice and data divided into sub-channels
Service Channel (MSC: Main Service Channe)
l).

FIG. 6 is a schematic diagram showing a FIG structure of a DAB signal. As shown in FIG. 5, the high-speed information channel includes a plurality of high-speed information blocks (FIBs).
on Blocks), and a high-speed information block is further divided into a plurality of high-speed information groups (FIG: Fa) as shown in FIG.
st Information Groups).

FIG. 7 is a schematic diagram showing the FIG type of the DAB signal. As shown in FIG. 7, there are eight types of high-speed information groups, which are classified according to the content of each type. For example, in FIG type 0,
Multiple configuration information and service information are multiplex-recorded.

FIG. 8 is a schematic diagram showing the structure of the FI signal of the FIG. DAB signal. As shown in FIG. 8, the frequency data (F
I: Frequency Information) signal is stored
It is standardized in Extension 21 of G type 0. The “FI list” in the FI describes whether or not an alternative broadcast (simultaneous broadcast) service is provided, and, if the alternative broadcast service is provided, a modulation method and a frequency thereof.

The DAB signal is divided into a plurality of DAB blocks, and a frequency is assigned to each DAB block. The bandwidth of the DAB block is about 1.
5 MHz, and 4 to 6 services are allocated to one DAB block. Specifically, one DAB block includes services such as sports programs, music programs, news programs, and weather information programs. These services may have different contents of the service being broadcast for each DAB block.

As described above, DAB is a digital broadcast suitable for mobile reception, and is suitable for reception by a vehicle-mounted DAB receiver or the like. In mobile reception, the receivable services differ depending on the receiving location, and there is a demand to know the receivable services at the current position. It is necessary to have an auto scan function to search for.

[0010] As a method of such an auto scan, a phase locked loop (PL) of a tuner section is used.
L: Phase Locked Loop) circuit is controlled to shift the reception frequency for each DAB frequency block, perform synchronization detection, determine the presence or absence of a DAB signal based on the demodulation result, and receive the DAB signal. In such a case, there is a method of storing the reception frequency in a memory inside the receiver and restarting the movement of the reception frequency.

Further, as disclosed in Japanese Patent Application Laid-Open No. 9-186556, current area information is obtained from PI (Program Identification) information inside a previously received DAB signal and prepared in a receiver in advance. There is also a method in which the search is completed in a short time by searching only a frequency used in the area from a table in which the area information and the broadcast frequency block corresponding to each other are searched.

[0012]

However, in the above-described auto-scanning method, during execution of the auto-scanning of the first signal such as the DAB signal, the reception frequency is sequentially changed, so that an audio output signal is obtained. However, since the output is muted until the end of the auto scan, there is a disadvantage that a silent state occurs.

When a plurality of tuners are provided, a second signal such as an FM broadcast or an AM broadcast is received and output, and other output devices such as a compact disk player and a mini disk player are provided. If you have
Although it is possible to output signals from these,
There is a disadvantage in that it is inconvenient to output a signal irrelevant to a service that can be received at the current position by the automatic scanning of the signal, which is inconvenient.

Further, if a service detected during the auto scan is reproduced for a certain period of time, the auto scan process is stopped while the service is being reproduced, so that the entire time of the auto scan becomes extremely long. Disadvantage.

Accordingly, the present invention provides a broadcast receiving apparatus capable of recognizing the contents of a service detected during an automatic scan and outputting a desired service when the desired service exists. It is an object.

[0016]

According to the present invention, a first signal having a plurality of broadcast blocks having a plurality of first services is received, demodulated, and the first service is output. And with the same content as the first service,
A first receiving means for extracting information on a second service of the second signal modulated by a modulation method different from that of the first signal; and a second receiving means for receiving the second signal, performing demodulation processing and outputting a second service. (2) receiving means, switching means for switching between the first signal and the second signal, and, when the first receiving means detects a broadcast block of the first signal, based on information about a second service included in the first signal. Control means for controlling switching of the switching means to output the first two services of the second receiving means.

According to a second aspect of the present invention, a first signal having a plurality of broadcast blocks having a plurality of first services is received and demodulated to output a first service. First receiving means for extracting information about a second service of a second signal having the same content as the service and modulated by a modulation method different from that of the first signal; and a second signal receiving and demodulating the second signal. Second receiving means for outputting the second service, switching means for switching between the first signal and the second signal, and the first receiving means detecting a broadcast block of the first signal having the first service without the second service. In this case, after outputting the first service without the second service, the control is performed such that the switching means is switched based on the information on the second service included in the first signal and the second receiving means outputs the second service. means It is characterized by comprising a.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A broadcast receiving apparatus according to the present invention will be described.
A description will be given as a broadcast receiving apparatus capable of receiving a DAB signal and an FM signal or an AM signal. Here, a plurality of first
A first signal having a plurality of broadcast blocks having a service is defined as a DAB signal, and a second signal having the same content as the first service of the first signal and modulated by a modulation method different from that of the first signal.
The second service of the signal is an FM signal or an AM signal.

FIG. 1 is a schematic diagram showing a schematic configuration of an embodiment of a broadcast receiving apparatus according to the present invention. In FIG. 1, a broadcast receiving apparatus 1 includes a DAB signal processing unit 2 as a first receiving unit.
And an FM / AM signal processing unit 3 as second receiving means;
A control unit 4 as control means, a switching unit 5 as switching means, an amplifying unit 6, and a speaker 7 are provided.

The DAB signal processor 2 includes a first antenna 8
, A DAB tuner 9 and a DAB signal demodulator 10. The first antenna 8 receives a DAB signal.

The DAB tuner section 9 has a front end and a phase locked loop (PLL) for outputting a local oscillation frequency signal corresponding to a frequency to be selected.
An ed Loop) circuit generates and outputs an intermediate frequency signal based on the DAB signal received by the first antenna 8.

The DAB signal demodulator 10 converts the intermediate frequency signal from the DAB tuner 9 into an I (In-phase) signal and a Q signal.
(Quadrate) signals are subjected to quadrature demodulation, and differential demodulation processing is respectively performed by fast Fourier transform (FFT: First Fouler Transform). Then, the DAB signal demodulation unit 10 outputs the main service symbol of the desired service symbol from the high-speed information channel (FIC) of the demodulated DAB signal.
A channel (MSC) is extracted, demodulated, and output after digital / analog (D / A: Digital / Analog) conversion.

The FM / AM signal processing unit 3 includes a second antenna 11, an FM / AM tuner unit 12, and an FM / AM signal demodulation unit 13. The second antenna 11 is an FM
A signal or an AM signal. Here, the second antenna 1
1 can also be used as the first antenna 8.

The FM / AM tuner section 12 has a front end and a phase locked loop (PLL: Phase) for outputting a local oscillation frequency signal corresponding to a selected frequency.
Locked Loop) circuit.

The FM / AM signal demodulation unit 13 converts the FM signal or the AM signal into an F / M signal suitable for each signal modulation method.
M demodulation or AM demodulation is performed and output.

The control unit 4 includes the DAB signal processing unit 2 and the FM
It controls the / AM signal processing unit 3 and controls the switching of the switching unit 5 described later. The control unit 4 includes a first memory (not shown) that stores a frequency and a level assigned to each block of the service of the DAB signal, and ID information and FI information of the service of the DAB signal received by the auto scan. And a second memory (not shown) for storing

Here, the contents of the first memory will be described. FIG. 2 is a schematic diagram illustrating frequencies assigned to DAB blocks. In FIG. 2, the band of the DAB block is about 1.5 MHz, and its center frequency is 1
They are arranged at multiples of 6 KHz. Four to six services are allocated in one DAB block, and the services in one DAB block are collectively called an ensemble.

More specifically, one DAB block has services such as sports programs, music programs, news programs, and weather information programs. These services are DA
The contents of the service being broadcast may be different for each B block. In the broadcast receiving apparatus of the present embodiment, DA
The frequency of the B block is scanned, and each service in the received DAB block is sequentially output, and
A frequency search of the DAB block is newly performed.

The switching unit 5 converts a signal output to the amplifying unit 6 based on the control of the control unit 4 into a D signal from the DAB signal processing unit 2.
Switching is performed between the AB signal and the FM signal or the AM signal from the FM / AM signal processing unit 3.

The DAB signal or F output from the switching unit 5
The M signal or AM signal is amplified by the amplifier 6 and output from the speaker 7.

The processing operation of the automatic scanning in the broadcast receiving apparatus 1 having the above configuration will be described. FIG.
9 is a flowchart illustrating an auto scan processing operation in the broadcast receiving apparatus according to the present embodiment. When the user instructs an automatic scan using an operation unit (not shown), the control unit 4 executes an automatic scan process (STEP 301).

When the execution of the auto scan is instructed, the control section 4 controls the PLL circuit of the DAB tuner section 9 with reference to the first memory, and the central frequency "174.928 MHz" which is the DAB block "13". And outputs a local oscillation frequency signal for receiving the signal.

When the DAB tuner 9 cannot receive the DAB signal of the DAB block "13" (STE
P303), the control unit 4 refers to the first memory and
The LL circuit is controlled to output a local oscillation frequency signal for receiving the center frequency “176.640 MHz” of the next DAB block “14” (STEP 304).

When the DAB tuner 9 can receive the DAB signal (STEP 303), the control unit 4 transmits all DAB signals that can be received at this frequency from the high-speed information channel of the DAB signal demodulated by the DAB signal demodulator 10. Services are extracted and the ID information and FI information of those services are
It is stored in the memory (STEP 305).

The control unit 4 extracts information on the simulcast from the service FI information, and based on the information on the simulcast, the FM / AM signal processing unit 3
The PLL circuit of the AM tuner unit 12 is controlled and the received D
Simultaneous broadcast of an FM signal or an AM signal corresponding to each service of the AB signal is received, and the FM / AM signal demodulation unit 13
To demodulate the simulcast (STEP 306).

Then, the control unit 4 switches the switching unit 5 to sequentially output the FM signal or AM signal of the simulcast corresponding to each service of the received DAB signal from the speaker 7 via the amplification unit 6 ( (STEP 307).

The time for outputting the simulcast can be set arbitrarily, and the simulcast of the received DAB signal is output for a fixed time.

While outputting the simulcast, the control section 4 controls the PLL circuit of the DAB tuner section 9 of the DAB signal processing section 2 with reference to the first memory, and outputs the next receivable DAB signal. Is searched (STEP 304).

If all the frequencies assigned to the DAB have been searched with reference to the first memory (S
(Step 302), end the auto scan (STEP 302).
307).

The user performs an operation of determining a service using an operation unit (not shown) when there is a service desired by the user while listening to the simulcast broadcasting in the above-described auto scan. . As a result, the control unit 4 interrupts the auto scan process in which the frequency of the DAB signal moves in the DAB signal processing unit 2, switches the switching unit 5, and outputs the output DAB signal of the service corresponding to the simulcast. Can be output.

After the end of the auto scan, the second
The service of the receivable DAB signal stored in the memory is sequentially output again, and the user can output the DAB signal sequentially output.
The desired service may be determined by listening to the signal.

Next, the processing operation of another embodiment of the broadcast receiving apparatus of the present invention will be described. In the present embodiment, a case will be described in which a service without simulcast exists among the services in the received DAB block.

FIG. 4 is a flowchart showing the processing operation of the automatic scan in another embodiment of the broadcast receiving apparatus of the present invention. When the user instructs an automatic scan using an operation unit (not shown), the control unit 4 executes an automatic scan process (STEP 401).

When the execution of the auto scan is instructed, the control section 4 controls the PLL circuit of the DAB tuner section 9 with reference to the first memory, and the central frequency "174.928 MHz" which is the DAB block "13". And outputs a local oscillation frequency signal for receiving the signal.

When the DAB tuner unit 9 cannot receive the DAB signal of the DAB block "13" (STE
P403), the control unit 4 refers to the first memory and
The LL circuit is controlled to output a local oscillation frequency signal for receiving the center frequency “176.640 MHz” of the next DAB block “14” (STEP 409).

When the DAB tuner 9 can receive the DAB signal (STEP 403), the control unit 4 transmits all DAB signals that can be received at this frequency from the high-speed information channel of the DAB signal demodulated by the DAB signal demodulator 10. Services are extracted and the ID information and FI information of those services are
It is stored in the memory (STEP 404).

Then, the control unit 4 extracts information on the simulcast from the FIB information of the DAB signal, detects a service without a simulcast and a service with a simulcast (STEP 405). 2
And outputs a service without simultaneous broadcasting as a DAB signal (STEP 406). At this time, the DAB signal processing unit 2 is in a state in which the operation of moving the frequency of the PLL circuit is temporarily stopped.

Then, D of the service without simulcast
After outputting the AB signal, if simultaneous broadcasting is present in all the remaining services (STEP 405), the control unit 4
Is a PLL of the FM / AM tuner unit 12 in the FM / AM signal processing unit 3 based on the information regarding the simulcast.
The circuit is controlled to receive a simulcast of the FM signal or the AM signal, and the FM / AM signal demodulator 13 demodulates the simulcast (STEP 407).

The control unit 4 switches the switching unit 5 to output the FM signal or the AM signal of the simulcast from the speaker 7 via the amplifying unit 6 (STEP 408).

After outputting a service without simulcast, while outputting a service with simulcast, the control unit 4 controls the PLL circuit of the DAB signal processing unit 2 with reference to the first memory. Then, a search for the frequency of the next receivable DAB block is started (STEP 409).

When all the frequencies assigned to the DAB block have been searched with reference to the first memory (STEP 402), the automatic scan is terminated (STEP 410).

As described above, a service without simulcast and a service with simulcast are detected from the FIB information of the DAB signal, the service without simulcast is first output as a DAB signal, and then the simulcast is output. By outputting a service with a broadcast, the load on the PLL circuit of the DAB signal processing unit 2 can be reduced.

First, a case where the broadcast receiving apparatus of the present embodiment is not used will be described. For example, there are four services in the received DAB block.
A case will be described where a simulcast exists in the second and fourth services, a simulcast does not exist in the third service, and the services are sequentially output from the first service.

The DAB signal processing unit 2 receives a DAB block (for example, DAB block “14” in FIG. 2),
The control unit 4 stores the frequency of the simulcast of the three services in the second memory, controls the FM / AM signal processing unit 3 sequentially from the simulcast of the first service, and outputs the simulcast. At this time, the DAB signal processing unit 2
To search for a DAB block of a new frequency, P
The automatic scan is performed by changing the frequency of the LL circuit.

When outputting the third service after outputting the simulcast of the second service, 3
Since there is no simulcast in the service, the control unit 4
Temporarily suspends the auto scan process of the DAB signal processing unit 2 searching for the frequency of a new DAB block of the DAB signal (for example, the DAB block "17" in FIG. 2), and sets the frequency of the PLL circuit to the third frequency. Services DA
The DAB block in which the B signal exists (for example, the DAB block in FIG. 2)
Return to block B "14"), DA of the third service
Output the B signal.

Thereafter, when outputting the fourth service, the control unit 4 controls the FM / AM signal processing unit 3 to output the fourth service.
Output the simulcast of the th service. At the same time, the control unit changes the frequency from the DAB block tuned to output the DAB signal of the third service, starts the temporarily stopped auto scan process of the DAB signal processing unit 2, and newly starts the auto scan process. Scanning is restarted from a DAB block having a low frequency (for example, DAB block “17” in FIG. 2).

For this reason, the shift of the frequency of the PLL circuit of the DAB signal processing unit 2 extremely changes between the frequency of the already received DAB block and the frequency of the newly received DAB block. Excessive burden. In addition, since the frequency of the PLL circuit of the DAB signal processing unit 2 greatly changes, it takes time until a service is output.

Therefore, in the broadcast receiving apparatus of this embodiment, there are four services in the received frequency block, of which the first, second and fourth services have simulcast and the third service has If the simultaneous broadcast does not exist in the service, the control unit 4 detects whether or not the simultaneous broadcast exists in all of the services, outputs the third service in which the simultaneous broadcast does not exist as a DAB signal, and outputs The simultaneous broadcast of the second service, the simultaneous broadcast of the second service, and the simultaneous broadcast of the fourth service are output in this order.

As a result, even if a service without simulcast is present in the received DAB block, the service without simulcast is first output as a DAB signal, and the service with simulcast is output later.
The frequency of the PLL circuit of the signal processing unit 2 does not significantly shift, so that the number of steps required for the auto scan can be reduced, and the frequency search of the DAB block can be prevented from being significantly delayed.

The user performs an operation of determining a service using an operation unit (not shown) when there is a service desired by the user while listening to the simulcast broadcasting in the above-described auto scan. . As a result, the control unit 4 interrupts the auto-scan process in which the frequency of the DAB signal moves in the DAB signal processing unit 2, switches the switching unit 5, and outputs or outputs the service of the output DAB signal. A DAB signal of a service corresponding to the simulcast can be output.

As described above, in the broadcast receiving apparatus of the present embodiment, the service of the DAB signal detected by the auto scan is controlled by the FM / AM signal processing unit 3 based on the FI information of the DAB signal. And the detected DA
Simultaneous broadcast of an FM signal or an AM signal having the same content as the service of the B signal is received and output, and during that time, the service of another receivable DAB signal can be scanned.

Further, since the user can listen to the service receivable by the simulcast while the broadcast receiving apparatus is performing the auto scan, the user may be in a silent state until the DAB signal auto scan is completed. There is no.

Further, since a service determined after the auto scan can be selected during the scan, the desired service can be output during the auto scan without waiting until all the auto scans are completed as in the related art. Can be.

Further, in the above-described embodiment, P in the DAB signal is used.
By combining the method of detecting the area information from the I information and searching only the DAB block assigned to the area, the time of the auto scan itself can be reduced.

[0065]

According to the present invention, it is possible to recognize the contents of the service detected during the auto scan, and to output the desired service when the desired service exists.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of an embodiment of a broadcast receiving apparatus according to the present invention.

FIG. 2 is a schematic diagram showing frequencies assigned to each block of DAB.

FIG. 3 is a flowchart illustrating an auto scan processing operation in the broadcast receiving apparatus according to the embodiment.

FIG. 4 is a flowchart showing an auto scan processing operation in another embodiment of the broadcast receiving apparatus of the present invention.

FIG. 5 is a schematic diagram showing a frame structure of a DAB signal.

FIG. 6 is a schematic diagram showing a FIG structure of a DAB signal.

FIG. 7 is a schematic diagram showing the type of FIG of a DAB signal.

FIG. 8 is a schematic diagram showing the structure of a FI signal of FIG.

[Explanation of symbols]

1. Broadcast receiving device, 2. DAB signal processing unit, 3.
FM / AM signal processing section, 4 control section, 5 switching section,
6 ··· Amplifier, 7 ··· Speaker, 8 ··· First antenna,
9 DAB tuner section, 10 DAB signal demodulation section,
11 ··· second antenna, 12 ·· FM / AM tuner unit, 13 ·· FM / AM signal demodulation unit.

Claims (2)

[Claims] 1. A first signal having a plurality of broadcast blocks having a plurality of first services is received and demodulated to output the first service, and the first signal has the same contents as the first service and has the same content as the first service. First receiving means for extracting information about a second service of a second signal modulated by a modulation method different from that of the signal, and second receiving means for receiving the second signal, performing demodulation processing, and outputting the second service Switching means for switching between the first signal and the second signal; and information on the second service included in the first signal when the first receiving means detects the broadcast block of the first signal. Control means for controlling the second receiving means to output the second service by switching the switching means on the basis of the above. 2. A first signal having a plurality of broadcast blocks having a plurality of first services is received and demodulated to output the first service, and the first signal has the same content as the first service and has the same content as the first service. First receiving means for extracting information about a second service of a second signal modulated by a modulation method different from that of the signal, and second receiving means for receiving the second signal, performing demodulation processing, and outputting the second service Switching means for switching between the first signal and the second signal; and when the first receiving means detects the broadcast block of the first signal having the first service without the second service, After outputting the first service without the second service, the switching means is switched based on the information on the second service included in the first signal, and the second service of the second receiving means is switched. Broadcast receiving apparatus characterized by comprising a control means for controlling to output.