JP2000068873A - Radio broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promptly listen to broadcast by stopping the change operation of a tuning frequency when a retrieval keyword is present in detected broadcast relating information signals. SOLUTION: When a tuning search command is issued from an operation part 12, a system controller 10 leaves a main control operation during execution at present and moves to the execution of a tuning search control routine. At the time tuning is performed while raising tuning frequency signals (f) by each prescribed step frequency α, and at the time of being tuned to certain broadcast waves during the time, RDS data are fetched from the broadcast waves. At the time, the tuning frequency change operation is executed until the tuning frequency signals (f) exceed upper limit tuning frequency signals fn as the upper limit frequency. When the same data string as the retrieval keyword (character code stream) is detected from the RDS data (PS data, PTY code and RT data), the tuning frequency change operation is stopped at the point of time and an audio source for performing output is forcibly switched to a receiver side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a radio broadcast receiver.

[0002]

2. Description of the Related Art There is known an RDS broadcasting system in which, together with an audio signal corresponding to a broadcast program, an RDS data signal carrying various information related to broadcasting is frequency-multiplexed to an FM broadcasting signal and broadcast. Here, various kinds of information included in the RDS data signal include, for example, a PI code, a code unique to a broadcasting station that can identify a program, a TP code, and whether or not the station is a traffic information corresponding station. PTY code ..... Code indicating program type (news, sports, music, etc.) PS data ..... Data indicating broadcast station name RT data .... Broadcast station side together with audio signal There are character data to be transmitted.

On the other hand, an RDS for receiving such a broadcast wave
The receiver demodulates an audio signal corresponding to the broadcast from an FM broadcast signal obtained by receiving the broadcast wave,
By detecting the RDS data signal from the FM broadcast signal, various information as described above can be obtained. In the RDS receiver, various functions are realized by using the RDS data.

For example, Japanese Patent Application Laid-Open No. 5-199136 discloses that a program belonging to a program type designated by a user can be selected from a plurality of currently receivable broadcasting stations by using the PTY code in the RDS data. There is disclosed a PTY search function of sequentially searching for broadcasting stations that are broadcasting and sequentially storing them in a memory. On this occasion,
After the end of the PTY search, when the user selects a desired broadcast station from the broadcast stations stored in the memory,
The station for this broadcasting station is automatically selected.

[0005] However, in the PTY search, it is not possible to maintain a channel selection state for a desired broadcast program until all the broadcasting stations broadcasting programs belonging to the program type designated by the user have been searched. Therefore, when there are many broadcast stations broadcasting programs belonging to this program type, a large amount of time is spent for the search, and it takes time until a desired broadcast program can be heard. There was a problem.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to search for a desired broadcast wave from broadcast waves from a plurality of broadcast stations. It is an object of the present invention to provide a radio broadcast receiver which can immediately listen to the radio broadcast.

[0007]

According to the radio broadcast receiver of the present invention, an audio signal corresponding to a broadcast program is multiplexed with a broadcast-related information signal including information on the broadcast program and information indicating a broadcast station. A radio broadcast receiver for receiving a radio broadcast wave, a receiving means for extracting a signal component having the same frequency as a tuning frequency from a received signal and using the signal component as a reception signal, and a tuning frequency change for changing the tuning frequency by a predetermined frequency Means, demodulation means for demodulating the audio signal from the received signal, broadcast-related information detecting means for detecting the broadcast-related information signal from the received signal, input means for inputting a search keyword, and the broadcast-related information signal It is determined whether the same data string as the search keyword exists in the search keyword. And a control means allowed to stop the number of changes behavior.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing a configuration of an audio device provided with a radio broadcast receiver according to the present invention. In FIG. 1, an antenna 1 supplies an FM reception signal obtained by receiving an FM broadcast wave on which an RDS data signal is multiplexed to a front end 2. In the FM reception signal, a radio wave of a desired broadcasting station is selected by the front end 2 and converted into an intermediate frequency (IF) having a frequency of 10.7 MHz.
The signal is amplified by the amplifier 3. The front end 2 has a mixer 2a and a PLL circuit 2b, and obtains a local oscillation signal to the mixer 2a by a PLL synthesizer method using a PLL path 2b including a programmable frequency divider (not shown). I have. The front end 2 sets the frequency of the local oscillation signal according to a tuning frequency signal f supplied from a system controller 10 described later. At this time, front end 2
Then, tuning according to the frequency of the local oscillation signal is performed.

The 10.7 MHz FM signal amplified by the IF amplifier 3 and sufficiently suppressed in amplitude is demodulated into an audio signal by the FM detector 4. The level detector 7 detects the level (electric field strength) of the received signal based on the IF signal level in the IF amplifier 3 and supplies this to the system controller 10. The station detector 8 determines that the received signal level is equal to or higher than a predetermined level, and that the S
When the detection output of the character curve characteristic is within a predetermined level range, a station detection signal indicating that the tuning for the broadcast wave from one broadcast station has been completed is generated and supplied to the system controller 10. The system controller 10 controls the front end 2 according to the received signal level supplied from the level detector 7 and the station detection signal supplied from the station detector 8.

The stereo demodulation circuit 5 includes the FM detector 4
If the audio signal demodulated in is a stereo signal, the audio signal is separated into an L (left) channel audio signal and an R (right) channel audio signal and supplied to the audio source selector 21. The audio signal output from the stereo demodulation circuit 5 becomes an audio signal output as a receiver.

The audio source selector 21 further includes a CD player 22 and a cassette tape player 2.
3 are supplied. The audio source selector 21 includes the stereo demodulation circuit 5, the CD player 22, and the cassette tape player 2.
3 selects one of the audio signals from each of the audio signals according to the source selection signal supplied from the system controller 10, and supplies it to the amplifier 24. Amplifier 24
, Amplifies the audio signal supplied from the audio source selector 21 as desired, and supplies the amplified signal to the speaker 25.
The speaker 25 converts the audio signal amplified by the amplifier 24 into acoustic vibration.

An RDS signal detection circuit 9 detects an RDS data signal from the detection output of the FM detector 4 and supplies the RDS data signal to a system controller 10. The operation unit 12 generates operation signals corresponding to various operations by the user, and supplies the operation signals to the system controller 10. The display unit 13
Image or character display based on various display data supplied from the system controller 10 is performed.

The character input device 14 is provided with character input keys for inputting characters. The character input device 14 converts character data input by a user's key operation into a character code C $.
This is supplied to the system controller 10. The voice input device 15 converts the voice of the user into a character code C $, which is character information corresponding to the voice, and supplies the character code C $ to the system controller 10. The character input device 14 and the voice input device 15 are used for inputting a search keyword in a channel search operation described below.

The system controller 10 includes an operation unit 12
When a channel selection search command is issued from, the main control operation (not described) that is currently being executed is exited, and the process proceeds to the channel selection search control routine as shown in FIG. The tuning search command is issued when the user presses, for example, a tuning search key provided on the operation unit 12.

In FIG. 2, first, the system controller 10 determines whether or not the character code C $ has been supplied from either the character input device 14 or the voice input device 15. (Step S21). During this time, the user uses the character input device 14 and the voice input device 15 to select and search for a desired broadcast station or a broadcast station transmitting predetermined character data. Alternatively, the character data is input. When the user wants to listen to a program belonging to a desired program type, for example, a news program, the character input device 14 and the voice input device 15 are required.
And input "news" as a search keyword.

If it is determined in step S21 that the character code C $ has been supplied, the system controller 10 causes the character code C $ to be sequentially written into the memory 11 (step S22). Next, the system controller 10 determines whether an input confirmation signal has been supplied from the operation unit 12 (Step S23). If it is determined in step S23 that the input confirmation signal has not been supplied, the system controller 10 returns to step S21 and repeatedly executes the above-described operation.

By executing steps S21 to S23 as described above, the search keyword input by the user is:
Character code string consisting of multiple character codes C $
It is taken into the memory 11 as C $ C. Here, when the input of all the search keywords is completed, the user presses the input confirmation key provided on the operation unit 12. When the input confirmation key is pressed, the operation section 12 generates an input confirmation signal as described above and supplies the signal to the system controller 10.

If it is determined in step S23 that the input determination signal has been supplied, the system controller 10 sets the lower limit tuning frequency signal f _L which is the lower limit of the tuning frequency as the tuning frequency signal f (step S24). . Next, the system controller 10 sends the tuning frequency signal f to the front end 2 (Step S).
25). By executing the step S25, the front end 2 performs tuning at the frequency of the tuning frequency signal f. Next, the system controller 10 determines whether or not a station detection signal has been supplied from the station detector 8 (Step S26). When it is determined in step S26 that the station detection signal has been supplied,
When the tuning for the broadcast wave from one broadcast station has been completed, the system controller 10 determines whether or not the RDS data signal has been supplied from the RDS signal detection circuit 9 (step S27). If it is determined in step S27 that the RDS data signal has been supplied, the system controller 10 determines from the RDS data signal a PTY code... Code indicating a program type (news, sports, music, etc.) PS data ... Data indicating the broadcast station name RT data... Each character data transmitted by the broadcast station together with the audio signal is fetched and written into the memory 11 (step S28).

Next, the system controller 10 determines whether or not the same data string as the character code string C $ C exists in the PS data (step S2).
9). If it is determined in step S29 that the same data string as the character code string C $ C does not exist in the PS data, the system controller 10
Is the character code string in the PTY code.
It is determined whether or not the same data string as C $ C exists (step S30). In step S30,
If it is determined that the same data string as the character code string C $ C does not exist in the PTY code, the system controller 10 next determines the same data string as the character code string C $ C in the RT data. It is determined whether or not exists (step S31).

If it is determined in any of steps S29 to S31 that the same data string as the character code string C $ C exists in the RDS data (PS data, PTY code, RT data), The system controller 10 currently has the audio source selector 2
It is determined whether the source selected in 1 is a receiver (step S32). If it is determined in step S32 that the currently selected source is not a receiver, the system controller 10 supplies a source selection signal for selecting a receiver to the audio source selector 21 (step S33). Such step S
The audio signal output from the stereo demodulation circuit 5 is selected from among the audio signals output from the CD player 22, the cassette tape player 23, and the stereo demodulation circuit 5 through the amplifier 23 and the speaker 25. Sound is output.

On the other hand, in step S31,
The same data as the above character code string C $ C is included in the RT data.
Data sequence does not exist, ie, RD
In S data (PS data, PTY code, RT data)
In any case, the same data as the above character code string C $ C
If the data string does not exist, the system controller 1
0 is the upper limit of the tuning frequency of the tuning frequency signal f
Upper tuning frequency signal f _HWhether it is higher than
Is performed (step S34). Incidentally, the step S34
Is supplied with the station detection signal in step S26.
If it is determined that there has been no, or
Determined that the RDS data signal was not supplied
Will also be executed if In this step S34,
When the tuning frequency signal f is equal to the upper limit tuning frequency signal f_HHigher than
If it is determined that there is not, the system controller 10
Add predetermined step frequency α to the tuning frequency signal f
Is set as a new tuning frequency signal f (s
Step S35). After the end of step S35, the system
The system controller 10 executes the above-described step S25.
Then, the operation described above is repeatedly executed.

That is, by repeatedly executing the control of steps S25 to S35, tuning is performed while increasing the tuning frequency signal f by a predetermined step frequency α. Fetch RDS data (tuning frequency change operation). In this case, according tuning frequency change operation, the tuning frequency signal f is performed until exceeding the upper tuning frequency signal f _H is the upper limit frequency. However, step S
29-31, the RDS data (PS data,
When the same data string as the search keyword (character code string C $ C) is detected from the PTY code and RT data), the tuning frequency change operation is stopped at that point and the audio source to be output is forcibly specified. Is switched to the receiver side.

As a result, even if the currently selected
Even if the audio source is a CD,
Broadcasts a program corresponding to the search keyword
Station is automatically selected and the broadcast
It switches to power. Note that in step S34,
And the tuning frequency signal f is _HThan
Is also higher, the system controller 10
Broadcast station corresponding to the search keyword does not exist
Is transmitted to the display unit 13 (step S).
36).

Here, after completion of step S36 or step S33, or step S3
If it is determined in step 2 that the currently selected audio source is a receiver, the system controller 10
Exits the channel selection search control routine and returns to the main control operation. In the above-described embodiment, if a search keyword is detected in the RDS data in steps S29 to S31, the tuning frequency change operation ends while the tuning state for the broadcast station is maintained. This may be restarted by a user operation.

For example, when a channel has been selected by the above-described channel selection search operation, but the broadcast content is not what the user intended, the user presses a seek command provided on the operation unit 12. In response to the seek command, the system controller 10 starts its control from step S35 shown in FIG.

[0026]

As described in detail above, in the radio broadcast receiver according to the present invention, while changing the tuning frequency by a predetermined frequency, a signal component having the same frequency as the tuning frequency is extracted from the received signal and used as a received signal. A broadcast-related information signal (RDS signal) is detected from the received signal, and when a search keyword is present in the broadcast-related information signal, the tuning frequency changing operation is stopped.

Thus, according to this configuration, after searching for a broadcast station broadcasting a broadcast program corresponding to the search keyword, the user can quickly listen to the broadcast program.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an audio device including a radio broadcast receiver according to the present invention.

FIG. 2 is a flowchart showing a channel selection search control routine.

[Brief description of reference numerals]

 2 Front End 3 IF Amplifier 4 FM Detector 8 Station Detector 9 RDS Signal Detection Circuit 10 System Controller 11 Memory 12 Operation Unit 13 Display Unit 14 Character Input Device 15 Voice Input Device

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Keiya Nonaka 25, Nishimachi, Kawada-shi, Saitama Prefecture 1 within Nishimachi, Pioneer Co., Ltd. 1 Pioneer Corporation Kawagoe Factory F-term (reference) 5K061 AA03 AA09 BB04 CC01 CC02 CC16 CC20 CC23 CC27 FF01 GG10

Claims (5)

[Claims] 1. A radio broadcast receiver for receiving a radio broadcast wave in which an audio signal corresponding to a broadcast program and a broadcast-related information signal including information on the broadcast program and information indicating a broadcast station are multiplexed. Receiving means for extracting a signal component having the same frequency as the tuning frequency from the received signal and using the signal component as a received signal; tuning frequency changing means for changing the tuning frequency by a predetermined frequency; and demodulating the audio signal from the received signal. Demodulating means, broadcast-related information detecting means for detecting the broadcast-related information signal from the received signal, input means for inputting a search keyword, and whether the same data string as the search keyword exists in the broadcast-related information signal Control means for determining whether or not the tuning frequency is present, and stopping the tuning frequency changing operation by the tuning frequency changing means when it is determined that the tuning frequency is present. A radio broadcast receiver characterized by: 2. The radio broadcast wave is an RDS broadcast wave, the broadcast-related information signal is an RDS data signal, and the RDS data signal includes PS data, PTY code, and RT data. The radio broadcast receiver according to claim 1. 3. The radio broadcast receiver according to claim 1, wherein said input means uses a character data string corresponding to a key input converted into a character code string as said search keyword. 4. The radio broadcast receiver according to claim 1, wherein said input means converts a voice into a character data string, and further converts this into a character code string as the search keyword. 5. An audio source selector for selecting one according to a source selection signal from among the audio signal demodulated by the demodulation means and a reproduced audio signal output from a plurality of reproducing devices and outputting sound. The control means, after stopping the operation of changing the tuning frequency by the tuning frequency changing means, the source selection signal to select the audio signal demodulated by the demodulation means to the audio source selector. The radio broadcast receiver according to claim 1, wherein the radio broadcast is supplied.