JP2000209167A - Digital audio broadcasting receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To listen to the broadcasting of a target category in a short time by taking out frequency data corresponding to the data of a detected result from a history table, setting a reception frequency and selecting the program group of program contents for which reception is desired. SOLUTION: An antenna 11 receives DAB(digital audio signal) broadcasting transmission waves and supplies them to a tuner circuit 12. The base band signals of DAB are taken out from the tuner circuit 12, supplied to an A/D converter circuit 13 and A/D converted to digital signals. Then, the digital signals are supplied to a quadrature demodulation circuit 14 and the data of in-phase components and quadrature components are demodulated. Then, the data are complex Fourier transformed in an FFT circuit 15, frequency components are outputted for respective symbols and supplied to a video decoder circuit 16, de-interleave and error correction are performed and also the digital audio data of a target program are selected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital audio broadcasting receiver.

[0002]

2. Description of the Related Art DAB (Eur
digital audio broadcasting according to the Eka 147 standard). This DAB can simultaneously broadcast up to 64 sets of digital audio signals and digital data by adopting a transmission bandwidth: 1.5 MHz modulation method: OFDM audio signal data compression method: MPEG audio layer II. .

For this reason, in the DAB, the broadcast of a program has a hierarchical structure, for example, as shown in FIG. That is, DAB is, as described above, 1.
Although using a transmission band of 5 MHz, this transmission channel is called an “ensemble”, and the ensemble is selected by tuning to the center frequency of the ensemble.

[0004] The ensemble is divided into groups called "services". In the case of FIG. 7, the service is divided into four services. The service is further divided into several "service components", each of which is a digital audio signal or digital data constituting one program.

[0005] In this case, the service corresponds to one of the broadcasting stations in FM broadcasting or the like.
The first service component of the first service broadcasts soccer (program 1A) at the first venue, the second service component broadcasts soccer (program 1B) at the second venue, and is used like. .

The ensemble is given an identification code called “ensemble ID”, and data of the ensemble ID is also sent. Further, a service is called a "program type" and, for example, as shown in FIG. 8, data indicating the genre of the service is attached to the service. In addition, service components are numbered sequentially for each of the services,
The serial number will also be sent.

Therefore, when listening to a DAB program, an ensemble (frequency) is selected, one service (group) among a plurality of services included in the ensemble is selected, and furthermore, the selected service is selected. A target service component (program) is selected from among them.

[0008]

As described above, DAB
Since the service broadcasted by is sent with a program type indicating the genre of the service, the service of the desired genre can be searched and received using the program type as a keyword.

However, in this case, the configuration of the ensemble can be arbitrarily changed by the broadcasting station. For example, only when there is a soccer game, the service 1 is prepared to broadcast the soccer at each venue, and when there is no soccer game, , Service 1 is stopped (not included in the ensemble). For this reason, when trying to listen to a certain service, the service may be stopped and cannot be heard.

Therefore, when searching for and receiving a service of a desired genre using the program type as a keyword, it is considered that a microcomputer executes, for example, a routine 900 as shown in FIG.

That is, when there is a frequency that has not been received, that frequency is set as a reception frequency (steps 902 and 903). It is checked whether an ensemble can be received (step 904). As a result, when the ensemble cannot be received,
Set the receiving frequency to the next frequency (step 90)
2). As a result, when the ensemble can be received, it is checked whether there is a service of the designated program type (steps 911 and 912). As a result, if there is a service of the designated program type, the service is selected (step 9).
13). As a result, when there is no service of the designated program type, the receiving frequency is set to the next frequency (step 902).

Therefore, according to this routine 900, it is possible to automatically select and listen to a service of a target genre.

However, in the above routine 900, a process of detecting an ensemble while seeking the frequency band of the DAB and searching for a service of the target genre for the ensemble is repeated, and the process of searching for the target genre is repeated. I am trying to receive services. Then, 64 ensembles are prepared as DAB frequency bands.

Therefore, it takes a very long time to receive a service of a target genre.

The present invention is intended to solve such a problem.

[0016]

Therefore, according to the present invention, a plurality of program groups and data indicating program contents of each of the plurality of program groups are digitally broadcast by one broadcast wave signal. The audio broadcast receiver has a frequency table for receiving the broadcast wave signal and a history table of the data. When receiving the broadcast, the data indicating the contents of the program desired to be received is stored in the history table. Search the above data, and as a result of this search,
When the corresponding data is detected, the frequency data corresponding to the data of the detection result is extracted from the history table, the reception frequency is set to the frequency indicated by the extracted frequency data, and the content of the program content desired to be received is set. This is a digital audio broadcast receiver in which a program group is selected. Therefore, the target service is searched from the history table of the ensemble received in the past.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a broadcast wave signal of DAB is received by an antenna 11, and this received signal is supplied to a tuner circuit 12. This tuner circuit 12
It is configured in a superheterodyne format with a PLL,
By changing the frequency division ratio N of the variable frequency divider circuit of the PLL, the reception frequency can be changed. Then, a baseband signal of DAB is extracted from the tuner circuit 12, and the baseband signal is supplied to an A / D converter circuit 13 and A / D converted into a digital signal.

The digital signal is supplied to a quadrature demodulation circuit 14 to demodulate data of an in-phase component (real axis component) and a quadrature component (imaginary axis component).
The T circuit 15 performs a complex Fourier transform to output a frequency component for each symbol, and the output is supplied to a Viterbi decoder circuit 16 to perform deinterleaving and error correction, and to perform digital audio of a target service component (program). The data is selected.

Subsequently, the selected data is supplied to an audio decoder circuit 17, where decoding processing such as MPEG data expansion is performed.
Digital audio data of a target program is extracted. Then, the extracted digital audio data is supplied to a D / A converter circuit 18 and D / A converted into analog audio signals L and R.
R is the speaker 21L, 2R through the amplifier 19L, 19R.
1R.

A microcomputer 31 is provided for controlling the system.
Ensemble (reception frequency) from 1 to tuner circuit 12
Is supplied as frequency data for selecting a frequency division ratio N of the variable frequency dividing circuit in the PLL.

Further, data necessary for identifying or specifying a service and a service component, that is, data such as a program type, is extracted from the Viterbi decoder circuit 16, and this data is supplied to the microcomputer 31. Further, the microcomputer 31 sends selection signals SSV, S to the Viterbi decoder circuit 16.
The SC is supplied, a service is selected by the signal SSV, and digital audio data of a target service component is selected from the selected service by the signal SSC.

The microcomputer 31 is provided with a search and reception routine 100 as shown in FIG. 2, for example, as a part of a program executed by the microcomputer 31. The details of this routine 100 will be described later, but FIG. 2 shows only a portion related to the present invention.

Further, the microcomputer 31 includes:
A memory 32 is provided. The memory 32 is, for example, a flash memory or a RAM (not shown) backed up by a battery.
The memory 32 is a non-volatile memory, and can hold written data even when the power is turned off.

The memory 32 contains, for example, FIG.
As shown in (1), a history table HTBL having a history of ensembles received in the past is provided. That is, the history table HTBL includes, as data when an arbitrary service is received, the frequency division ratio N of the variable frequency dividing circuit in the PLL of the tuner circuit 12, the ensemble ID, and the reception time (year / month / day and hour / minute). Are set as one set, and the plurality of sets are stored and held. In the case of FIG. 3, the division ratio N1, the ensemble ID (ENID01), and the reception time TIME01 at that time are held as data when a certain DAB station is received in the first row.

A clock circuit 33 for measuring the current time is connected to the microcomputer 31. Further, various operation keys 34 constituted by, for example, push switches are connected to the microcomputer 31 and a display for displaying various information is provided. An element, for example, an LCD 35 is connected.

In such a configuration, when an ensemble is selected by a manual operation and the service is received, the history table HTBL is updated. That is,
When the ensemble selected by the key operation is not included in the history table HTBL, one set of the frequency division ratio N, the ensemble ID, and the time indicated by the clock circuit 33 is added to the history table HTBL. Is done. When the ensemble selected by the key operation is included in the history table HTBL, the reception time paired with the division ratio N at that time in the history table HTBL (the reception time in the same row). Is updated to the current time measured by the clock circuit 33.

Therefore, in the history table HTBL, for an ensemble that has been received in the past, the frequency division ratio N, the ensemble ID, and the reception time at the time of the last reception are registered. When the contents of the history table HTBL are updated, for example, the history table HTBL is sorted such that the data set of the latest reception time becomes the first data set.

When a menu key among the operation keys 34 is pressed, a menu is displayed on the LCD 35.
When the cursor key is used to move the cursor to “reception by genre” of the menu item and press the enter key, genres such as “pops” and “news” are displayed on the LCD 35.

When the cursor is moved to the target genre and the enter key is pressed, the microcomputer 31 temporarily stores the program type indicating the genre where the cursor was located at this time.

Subsequently, the processing in the microcomputer 31 starts from step 101 of the routine 100. Next, in step 102, the history table HTBL
It is determined whether the reception has been executed for all the division ratios N registered in. And all division ratios N
When the reception has not been performed, the process proceeds from step 102 to step 103, and
In 3, the frequency division ratio N of the frequency not performing reception in the history table HTBL is read from the history table HTBL and set in the tuner circuit 12, that is, the reception frequency is set.

Subsequently, in step 104, it is determined whether or not the ensemble can be received at the current reception frequency. If the ensemble cannot be received, the process returns from step 104 to step 102. Therefore, steps 102 to 104 are repeated until an ensemble can be received, and the ensemble is changed at this time.

If it is determined in step 104 that the ensemble can be received at the current reception frequency, the process proceeds from step 104 to step 111, where the history table HTBL is updated. In this case, in the history table HTBL, the frequency division ratio N (step 103
Is updated to the current time measured by the clock circuit 33.

Next, at step 112, it is searched whether the service of the target genre is included in the service of the currently received ensemble. In this case, this search is performed by checking whether or not the program type once registered in the microcomputer 31 immediately before the execution of the routine 100 is included in the currently received ensemble.

Then, the result of this search is
Service of the target genre,
If it is not included in the ensemble being received, the process returns from step 113 to step 102. Therefore, until the service of the target genre is included in the ensemble being received, steps 102-1 are performed.
13 will be repeated. At this time, the ensemble is being changed.

When the service of the target genre is included in the ensemble being received in step 113, this is detected in step 113, and the process proceeds from step 113 to step 121. In this step 121, a selection signal SSV for designating a service of a target genre (a service of a program type once registered in the microcomputer 31 immediately before the execution of this routine 100) and a first signal in the service, for example, Is supplied to the Viterbi decoder circuit 16 to select a service, a service component is selected, and then a step 12 is performed.
This routine 100 is terminated by 2.

Therefore, from the point in time when step 121 is executed, the target genre is selected and received, and the user can listen to the program of the target genre.

When the reception has been executed for all the frequency division ratios N registered in the history table HTBL in step 102, the process proceeds from step 102 to step 131. The LCD 35 indicates that the genre service is not currently being broadcast.
At step 22, the routine 100 ends.

Thus, according to the DAB receiver of FIG.
Since an ensemble that has been received in the past is received and a service of a target genre is searched, it is possible to listen to the service of the target genre in a short time.

FIG. 4 shows that when the service of the target genre cannot be received in the ensemble registered in the history table HTBL, the service of the target genre is searched for in the ensemble not registered in the history table HTBL. This is the case.

That is, also in the routine 200 of FIG. 4, steps 102 to 122 are configured in the same manner as the routine 100 of FIG. Therefore,
If an ensemble registered in the history table HTBL includes a service of a target genre, the service can be heard in a short time as described above.

However, when the ensemble registered in the history table HTBL does not include the service of the target genre, this is determined in step 102, and the process proceeds from step 102 to step 241. It is determined whether there is a frequency division ratio N that is not registered in the history table HTBL and has not yet been searched for a service.

If there is a frequency division ratio N for which a service search has not been executed, the process proceeds to step 241.
Then, the process proceeds to step 242. In this step 242, the frequency division ratio N for which service has not been searched is set in the tuner circuit 12, and then the process proceeds to step 104.

Therefore, if an ensemble is broadcasted and the ensemble includes a service of a target genre even if the frequency is not registered in the history table HTBL and the frequency is the frequency division ratio N, The service is received in the ensemble, and the service can be heard.

At this time, the history table HTBL is updated in step 111. In this case, one set of the frequency division ratio N, the ensemble ID, and the time indicated by the clock circuit 33 is stored in the history table HTBL. Added to HTBL.

If the target service cannot be received even at the frequency of the frequency division ratio N that is not registered in the history table HTBL, the process proceeds from step 241 to step 2
In step 251, for example, the fact that the service of the target genre is not currently broadcast is displayed on the LCD 35, and then the routine 200 ends in step 122.

Therefore, according to the routine 200, the ensemble which has been received in the past is searched with priority, and all the ensembles are searched. Can be searched.

By the way, DAB is capable of transmitting the program type of a service in another ensemble as data of another station. Thus, in the search and reception routine 300 shown in FIG. 5, when such data is transmitted, the data is also used.

That is, in the routine 300, steps 101 to 251 correspond to the routine 200.
And a step 301 is provided between steps 101 and 102. In this step 301, it is determined whether or not the service program type in another ensemble is transmitted.

If the program is being transmitted, the process proceeds from step 301 to step 302. In this step 302, the program type of the service in the other ensemble being transmitted includes the program type of the target service. Please be searched. If there is a program type of the target service, the process proceeds from step 302 to step 303. In this step 303, the reception frequency is set to the ensemble including the target service. Then, search and reception of the target service are executed.

In step 301, when the program type of the service in the other ensemble is not transmitted, and in step 302, the program type of the service in the other ensemble being transmitted is replaced with the program type of the target service. If there is no, step 301 or step 3
From 02, the process proceeds to step 102, and thereafter, the search process is executed as described above.

In this case, if the ensemble cannot be received in step 104, the process returns from step 104 to step 301. When the service of the target genre is not included in the ensemble being received in step 113, the process returns from step 113 to step 301.

Thus, according to the routine 300, when the program type of a service in another ensemble is transmitted as data of another station, search and reception of a target service are executed using the data. Therefore, the target service can be received in a shorter time.

In the search / reception routine 400 shown in FIG. 6, when a target service is searched for and received,
In the first search / reception mode in which only the ensemble registered in the history table HTBL is searched, and when the target service cannot be received in this search / reception mode, it is not registered in the history table HTBL. This is a case where the user can select the second search reception mode for searching for an ensemble.

In other words, in this case, the user
The user operates the key 34 to set in advance whether the search is performed in the search reception mode or the second search reception mode. Then, when the routine 400 is executed, the process proceeds to step 401 following step 101, and in this step 401, the search reception mode is set to the first search reception mode or the second search reception mode is set. Is determined.

When the first search / reception mode has been set, the processing proceeds from step 401 to routine 1
The process proceeds to step 102 of 00, and when the second search / reception mode is set, the process proceeds from step 401 to step 102 of the routine 200.

Therefore, according to the routine 400, when the search / reception mode is set to the first search / reception mode according to the purpose of the user, the target service can be received in a shorter time, and the second service can be received. When the search and reception mode is set, it may take a long time to receive, but it is possible to reliably receive the desired service, and therefore it is possible to perform reception in accordance with the state desired by the user.

In the routines 100 to 400,
When a reception frequency is set for an ensemble registered in the history table HTBL and the ensemble cannot be received, a data set related to the ensemble may be deleted from the history table HTBL.

[0058]

According to the present invention, it is possible to listen to a broadcast of a target genre in a short time. Also,
Search can be performed reliably. Further, it is possible to listen to the broadcast of the intended genre in a short time or reliably according to the purpose of the user.

[Brief description of the drawings]

FIG. 1 is a system diagram illustrating one embodiment of the present invention.

FIG. 2 is a flowchart illustrating one embodiment of the present invention.

FIG. 3 is a diagram for explaining the present invention.

FIG. 4 is a flowchart showing another embodiment of the present invention.

FIG. 5 is a flowchart showing another embodiment of the present invention.

FIG. 6 is a flowchart showing another embodiment of the present invention.

FIG. 7 is a hierarchical diagram for explaining the present invention.

FIG. 8 is a diagram for explaining the present invention.

FIG. 9 is a flowchart for explaining the present invention.

[Explanation of symbols]

11 antenna, 12 tuner circuit, 13 A / D converter circuit, 14 quadrature demodulation circuit, 15 FFT circuit, 16 Viterbi decoder circuit, 17 audio decoder circuit, 18 D / A converter circuit, 21L and 21R: speaker, 31: microcomputer, 32
... memory, 33 ... clock circuit, 34 ... operation keys, 35 ... L
CD, 100 ... search reception routine

Claims (3)

[Claims] A plurality of program groups and data indicating program contents for each of the plurality of program groups include one program group.
A digital audio broadcast receiver broadcasted by two broadcast wave signals, comprising: a frequency table for receiving the broadcast wave signal; and a history table of the data. The data in the history table is searched by the data indicating the above, and when the relevant data is detected as a result of the search, the frequency data corresponding to the data of the detection result is extracted from the history table, and the extracted frequency A digital audio broadcast receiver in which a reception frequency is set to a frequency indicated by data and a program group of the program content desired to be received is selected. 2. The digital audio broadcast receiver according to claim 1, wherein when the search does not find the corresponding data, the digital audio broadcast receiver registers the broadcast wave signal of the broadcast band in the history table. For the broadcast wave signal that has not been performed, the data included in the broadcast wave signal is searched for by the data indicating the program content desired to be received. As a result of the search, when the corresponding data is detected, A digital audio broadcast receiver configured to continue receiving the broadcast at the reception frequency at the time and select a program group of the program content desired to be received. 3. A program program comprising: a plurality of program groups; and data indicating program contents for each of the plurality of program groups,
A receiver for digital audio broadcasting broadcasted by two broadcast wave signals, having a history table of frequency data for receiving the broadcast wave signal and the data, and setting a first reception mode Is searched for the data in the history table according to the data indicating the contents of the program desired to be received. As a result of the search, when the corresponding data is detected, the frequency data corresponding to the data of the detection result is described Take out from the history table, set the receiving frequency to the frequency indicated by the taken out frequency data, select the program group of the program contents desired to be received, and set it to the second receiving mode. As a result of the search, when the corresponding data is not detected, among the broadcast wave signals in the broadcast band, A search is made for the data contained in the broadcast wave signal with data indicating the contents of the program desired to be received for the broadcast wave signal which has not been received, and as a result of the search, when the corresponding data is detected, A digital audio broadcast receiver configured to continue the reception of the broadcast at the reception frequency and select a program group of the program content desired to be received.