JPH09116452A - Receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically record the latest traffic information. SOLUTION: The receiver using the RDS service is provided with a recording and reproducing circuit 40, which records and reproduces an audio signal, and a circuit 23 which takes out data out of the signal outputted from a reception circuit 10. When data indicates the start of a program, recording of the audio signal of the program is started by the recording and reproducing circuit 40. When the program of data ends, recording of the audio signal of the program is terminated by the recording and reproducing circuit 40. The audio signal recorded in the recording and reproducing circuit 40 is reproduced and taken out at an arbitrary time.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a receiver using, for example, RDS data.

[0002]

2. Description of the Related Art Among FM broadcasting stations in Europe, there are broadcasting stations providing RDS services. This R
In the DS service, data called RDS data is added to an original audio signal for broadcasting. The RDS data is a collection of digital data relating to a broadcasting station, a program, etc., and the RDS data includes a PI code ... Broadcasting station identification code PTY code ... Identification code TA code indicating the content of the program. ... Traffic information announcement identification code AF list ..... There is a list of alternative frequencies.

Here, the PI code is 16-bit data having a country code, a program code and the like. Also, P
TY code is news, pops, education, sports,
Information such as information about the content or type of program is 5
It is a code indicated by bits. Further, the TA code is data that becomes "1" during the broadcasting of traffic information. Also, A
The F list is a list of frequencies of broadcasting stations broadcasting the same program as the currently received program, and has data for up to 25 stations.

Then, the RDS data is subjected to an encoding process for error correction, and the RDS data subjected to the encoding process has a frequency of 57 kHz (this is a value three times the frequency of the stereo pilot signal of 19 kHz). The subcarrier signal is balanced-modulated, and the modulated signal is added to a monaural signal or a stereo composite signal as a main signal and frequency-multiplexed, and the main carrier signal is FM-modulated by the multiplexed signal and transmitted.

Therefore, by using this RDS data, for example, the following processing can be performed. That is, while listening to the broadcast, if the broadcast of traffic information starts at another broadcast station, that broadcast station is selected, and when the traffic information ends, it returns to the original station. At the receiving station, turn up the volume when the traffic information starts broadcasting, and return to the original volume when finished.

If these terms or the processing of the terms can be executed, the traffic information will not be missed. For example, if you are driving a car, you can always hear the latest traffic information. Alternatively, you can know the traffic situation before you go out by car.

[0007]

However, the term or the processing of the term is effective only when the user is near the receiver. For example, when trying to know the traffic situation before going out, it is necessary to listen to the broadcast until the traffic information is broadcast. Also, while driving a car,
If you can't hear a part of the broadcast, you can't hear it again.

The present invention is to solve such a problem.

[0009]

For this reason, in the present invention, the main signal is a program that conveys a situation that changes with time, and the main signal contains data indicating the start and end of the program. In a broadcast receiver that is multiplexed and broadcast, a receiving circuit that receives the broadcast, a recording and reproducing circuit that records and reproduces an audio signal, and a circuit that extracts the data from the signals output from the receiving circuit And when the data indicates the start of the program, the recording / reproducing circuit starts recording the audio signal of the program, and when the data indicates the end of the program, the recording / reproducing circuit. , The recording of the audio signal of the program is completed, and the audio signal recorded in the recording / reproducing circuit is reproduced and taken out at an arbitrary time. It is an opportunity.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 10 indicates an FM receiving circuit, and a broadcast wave signal received by an antenna 11 is supplied to a tuner circuit 12. The tuner circuit 12 includes an antenna input circuit to an FM demodulation circuit, is configured in a superheterodyne system, and is configured to perform channel selection by a PLL synthesizer circuit.

In this way, the tuner circuit 12 demodulates and extracts the multiplexed signal of the audio signal (monaural signal or stereo composite signal) and the signal modulated by the RDS data.

The audio signal of the demodulated output from the tuner circuit 12 is the low-pass filter 13
-> Normally closed contact NC of the switch circuit 14 which will be described later-> It is supplied to the speaker 16 through the signal line of the output amplifier 15.

Further, the demodulation output from the tuner circuit 12 is passed through the bandpass filter 21 and the RDS demodulation circuit 2
2, the RDS data is demodulated, and the RDS data is supplied to the decoder circuit 23,
The RDS data on which the error correction has been performed is taken out from.

Further, reference numeral 30 indicates a microcomputer for controlling the system. This microcomputer 3
Reference numeral 0 denotes a CPU 31, a ROM 32 in which various processing routines are written, a work area RAM 33, input / output ports 34 to 36, and a key interface circuit 37.
Having. The circuits 32 to 37 are connected to the CPU 31 through the system bus 39.

The port 34 is connected to the tuner circuit 12, and data for designating a reception frequency is supplied from the CPU 31 to the tuner circuit 12 through the port 34 to select a channel. Further, the RDS data from the decoder circuit 23 is taken into the CPU 31 through the port 35.

Further, the interface circuit 37 includes
Various operation keys K1 to KN such as tuning keys are connected.
Each of these operation keys K1 to KN is composed of a non-lock type push switch.

A recording / reproducing circuit 40 for broadcasting audio signals is also provided. In the case of FIG. 1, the recording / reproducing circuit 40 is configured to record / reproduce an audio signal in / from a semiconductor memory.

That is, the audio signal from the low-pass filter 13 is supplied to the A / D converter circuit 41 to be a digital audio signal having a predetermined sampling frequency and quantization bit number, and this digital audio signal is supplied to the memory 42. It

A memory controller circuit 44 is connected to the memory 42, and when a command for writing or reading to the controller circuit 44 is supplied from the CPU 31, the controller circuit 44 writes or reads data to or from the memory 42. In addition to being controlled, the write address or read address is controlled.

In this case, as a mode for writing the digital audio signal in the memory 42, an overwrite mode in which writing is started from the head address of the memory 44 each time the writing mode is set, and a final writing of the last writing is performed in the writing mode. An additional mode in which writing is started from the address next to the address is conceivable.
In the case of, writing is set to the overwrite mode.

The read start address is always set equal to the write start address. Further, the capacity of the memory 42 is, for example, 5 minutes when converted into the recording time of the digital audio signal.

When the digital audio signal is read from the memory 43, the digital audio signal is supplied to the D / A converter circuit 43 and converted into an analog audio signal, and this audio signal is a normally open contact of the switch circuit 14. Supplied to NO. Further, the control signal is supplied from the port 36 to the switch circuit 14.

In such a configuration, when one of the keys K1 to KN relating to channel selection is operated, data for designating the reception frequency is supplied from the CPU 31 to the tuner circuit 12 through the port 34, and broadcasting corresponding to the key operation is performed. The station is selected. At this time, the switch circuit 14
Is connected to the normally closed contact NC by the output signal of the port 36. Therefore, the broadcast of the broadcast station selected by the key operation can be heard through the speaker 16.

At this time, the receiving broadcasting station is R
In the case of a broadcasting station that provides a DS service, the decoder circuit 23 outputs RDS data and supplies it to the port 35.

When one of the keys K1 to KN is operated to instruct the recording of traffic information, the CPU 31 checks the TA code indicating whether or not the traffic information is broadcast in the RDS data supplied to the port 35. To be done. When the TA code is "0", nothing is done.

However, when the traffic information comes to be broadcast, the TA code becomes "1" at this time, and this is detected by the CPU 31, and the controller circuit 44
A command for instructing writing is supplied to. As a result, writing to the memory 42 is started, and the digital audio signal from the A / D converter circuit 41, that is,
The digital audio signal of traffic information is stored in the memory 42.
Overwriting is performed in order from the first address toward the last address. Therefore, when the broadcast of the traffic information is started, it will be digitally recorded in the memory 42.

When the broadcasting of the traffic information is completed, the TA code becomes "0" at this time, and the TA code becomes C.
A command that is detected by the PU 31 and that instructs the controller circuit 44 to end writing is supplied. As a result, the writing of the digital audio signal in the memory 42 is completed. Therefore, when the broadcasting of the traffic information ends, the digital recording of the traffic information also ends.

When any one of the keys K1 to KN is operated to instruct reproduction at any time, the switch circuit 14 is connected to the normally open contact NO by the control signal from the port 36. In addition, a command for reading out is supplied from the CPU 31 to the controller circuit 44. As a result,
The reading of the memory 42 is started, and the digital audio signal of the traffic information written in the memory 42 is sequentially read from the head address of the memory 42 toward the final address.

The read digital audio signal is supplied to the D / A converter circuit 43 and D / A converted into an analog audio signal, that is, an audio signal of traffic information, and the audio signal is switched. It is supplied to the speaker 16 through the amplifier 14 and the amplifier 15. Therefore, the user can reproduce and listen to the traffic information digitally recorded in the memory 42.

During this reproduction, among the keys K1 to KN,
When the key for instructing stop is operated, the switch circuit 14 is connected to the normally closed contact NC by the control signal from the port 36. Further, the CPU 31 supplies the controller circuit 44 with a command instructing the end of reading. As a result, the reading of the memory 42 is completed, and the digital audio signal of traffic information is no longer read.

Thus, according to this FM receiver, when traffic information is broadcast, it is automatically digitally recorded in the memory 42, and the recorded traffic information can be reproduced and listened to at any time. You can Therefore, when the traffic information is broadcast, it is not necessary to be near the receiver, and the traffic status can be known even when a part of the receiver is missed.

Moreover, when the traffic information is digitally recorded in the memory 42, it is recorded by overwriting. Therefore, the latest traffic information is always recorded in the memory 42, and the driver should drive according to the old traffic information. You can prevent this.

In the above description, when the power switch of the receiver is turned off, the amplifier 15 is muted so that no sound is output. However, power is supplied to other circuits so that the power switch is turned on. It is also possible to digitally record in the memory 42 even traffic information that was broadcast during the period when the switch was turned off.

Further, in the above description, the target of recording / reproducing with respect to the memory 42 is the traffic information, but it is a program that informs that the situation changes with time, and data indicating the start and end of the program is multiplexed. Information services such as weather forecasts and stock market conditions can be recorded and reproduced in the same manner as long as they are broadcast and broadcast.

Furthermore, in the above description, the intended audio signal is digitally recorded / reproduced in the memory 42, but other recording / reproducing media may be used.
The recording / reproducing circuit 40 may be changed according to the medium.

In addition, FM character multiplex broadcasting, for example DARC
Even in a receiver which receives the character multiplex broadcasting of the system, the target program can be automatically recorded similarly using the data to be multiplexed.

[0037]

According to the present invention, for example, when traffic information is broadcast, it is automatically recorded, and the recorded traffic information can be reproduced and listened to at any time. Therefore, when the traffic information is broadcast, it is not necessary to be near the receiver, and the traffic status can be known even when a part of the receiver is missed.

Moreover, for example, when recording traffic information,
Since the record is made by overwriting, the latest traffic information is always recorded, and it is possible to prevent driving according to the old traffic information.

[Brief description of the drawings]

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

[Explanation of symbols]

 10 FM receiving circuit 12 Tuner circuit 13 Low-pass filter 21 Band-pass filter 22 RDS demodulation circuit 23 Decoder circuit 30 Microcomputer 31 CPU 40 Recording / reproducing circuit 41 A / D converter circuit 42 Memory 43 D / A converter circuit 44 Memory controller circuit

Claims (4)

[Claims] 1. A broadcast receiver in which a main signal is a program that conveys a situation that changes with time, and data indicating the start and end of the program is multiplexed and broadcast on the main signal. A reception circuit for receiving the broadcast, a recording / reproduction circuit for recording / reproducing an audio signal, and a circuit for extracting the data from the signals output from the reception circuit, wherein the data is the start of the program. , The recording / reproducing circuit starts recording the audio signal of the program, and when the data indicates the end of the program, the recording / reproducing circuit ends recording of the audio signal of the program. The audio signal recorded in the recording / reproducing circuit,
A receiver designed to be played back and taken out at any time. 2. The receiver according to claim 1, wherein the data is data in an RDS service. 3. The receiver according to claim 2, wherein the recording / reproducing medium of the recording / reproducing circuit is a semiconductor memory. 4. The receiver according to claim 3, wherein the program is traffic information and the data is data in an RDS service.