JP2869490B2 - FM multiplex broadcast receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an FM broadcast, in which audio (sub-audio) different from the main program is used.
The present invention relates to a receiving apparatus for receiving an FM multiplex broadcast in which characters and characters are multiplexed and transmitted.

<Conventional technology> FM multiplex broadcasting multiplexes the current FM broadcasting and broadcasts voices, characters, or program codes different from the main program, and seeks to provide various new services. is there. Various methods have been developed and put into practical use in each country,
European RDS (Radio Data System) and US SC
There is A (Subsidiary Communication Authorization), and FM multiplex broadcasting that multiplexed sound has been started in August 1988 by FM Tokyo in Japan.

The services received by the receiver through such FM multiplex broadcasting include the provision of programs different from the main program in audio broadcasting, so-called “more channel” usage, and digital services such as characters / graphics and receiver control codes. A data service for sending data is considered. Examples of this data service include sending a program code to enable automatic recording and automatic channel selection, or displaying information related to the main program during broadcast to supplement the main program FM broadcast. Can be considered. Further, a service of text information such as weather forecast, traffic information or news completely independent of the main program is conceivable.

FIG. 2 shows a frequency spectrum of such FM multiplex broadcasting. The occupied bandwidth of FM broadcasting is set to ± 100 kHz, and the current stereo signal of FM broadcasting is 53 kHz.
Since the band up to 100 kHz is used, the frequency band up to 100 kHz is used for the FM multiplex signal.

The multiplexed signal has a specified sub-carrier frequency and signal bandwidth so as not to interfere with the reception of the current stereo broadcast. The sub-carrier frequency is 76 kHz and the multiplexed signal level is 2.5% (maximum frequency shift). ± 1.875 kHz), the frequency band is 60.4 kHz to 91.6 kHz, and the subcarrier modulation method is defined as QPSK modulation.

In other words, FM multiplex broadcasting is an ADPCM signal (adaptive differential PCM signal) obtained by digitizing an analog audio signal or a digital signal corresponding to character information.
It is PSK modulated and multiplexed with the current stereo signal and transmitted.The bit rate of the ADPCM signal is 32 kb / s, and the bit rate of the character signal is 1 kb / s. The bit rate of the signal (composite signal) is 48 kb / s.

<Problems to be solved by the invention> Considering such a new use form of FM multiplex broadcasting,
In an FM multiplex broadcast receiving apparatus, a function of recording information such as received sub-voices and characters and reproducing the information easily at any time is desired.

The present invention has been made in view of the above points,
Records information such as sub audio and text multiplexed on FM broadcasts,
It is an object of the present invention to provide an FM multiplex broadcast receiving apparatus that can easily reproduce any time.

<Means for Solving the Problems> In the FM multiplex broadcast receiving apparatus of the present invention, in order to achieve the above-mentioned object, information such as a voice signal and a character signal different from the main program is multiplexed and transmitted to the FM broadcast. Receiving FM multiplex broadcasting
An FM multiplex broadcast receiver including an FM tuner section for performing FM detection and stereo demodulation, and a multiplex signal demodulation section for demodulating the information multiplexed from the FM detection output of the FM tuner section, and the FM multiplex broadcast reception. An IC card, which is detachable from the device and in which desired information among the information demodulated by the multiplex signal demodulator is recorded, and wherein the IC card is detachable and recorded on the IC card. An output device that reproduces the information and performs audio output or display,
The information demodulated by the multiplexed signal demodulation unit includes an identification code indicating a program category of data being demodulated, and a selection unit for generating a corresponding identification code in response to a selection operation for selecting a program category. When the identification code matches the identification code demodulated by the multiplex signal demodulation unit, the desired information is recorded on the IC card.

<Operation> According to the above configuration, by recording information such as sub-voices and characters received and demodulated by the FM multiplex broadcast receiver on a removable IC card, an output device having only a reproduction function can be provided.
Information on the IC card can be easily reproduced and output.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an FM multiplex broadcast receiving apparatus according to one embodiment of the present invention.

The FM multiplex broadcast receiving apparatus 1 of this embodiment is basically
FM multiplex broadcasting receiver 2 that receives and demodulates FM multiplex broadcasting in which information such as audio signals and text signals different from the main program is multiplexed.
And an IC card 3 which is detachably attached to the FM multiplex broadcasting receiver 2 and in which the demodulated information is recorded, and the IC card 3 which is detachable and which is recorded on the card 3 And a portable output device 4 for playing back and outputting or displaying audio.

The FM multiplex broadcast receiver 2 receives an FM multiplex broadcast and performs FM detection and stereo demodulation, and information such as audio signals and character signals multiplexed from the FM detection output of the FM tuner 5. And a multiplex signal demodulation unit 6 for demodulating the signal.

The FM tuner unit 5 includes a high-frequency amplifier (RF amplifier) 7 for amplifying radio waves from the antenna, and a high-frequency amplifier 7
A mixing circuit 9 for mixing the output of the local oscillation circuit 8 with the output of the local oscillation circuit 8 to convert the output to an intermediate frequency corresponding to a desired broadcast wave, an intermediate frequency amplifier (IF amplifier) 10 for amplifying the intermediate frequency signal, It has an FM detection circuit 11 that performs FM detection on the output of the frequency amplification circuit 10, and a stereo demodulation circuit 12 that separates the left and right audio signals from the FM detection output, and supports the main program that is the output of the stereo demodulation circuit 12. The audio signal is supplied to the switching circuit 13.

The multiplex signal demodulation unit 6 is provided from the FM tuner unit 5
A 76 kHz bandpass filter 14 for extracting a multiplex signal from the FM detection output, and a PLL circuit 15 locked to this 76 kHz
A QPSK decoder 16 for QPSK demodulation of a multiplexed signal, an FC detection circuit 17 for detecting a header signal (FC) of QPSK demodulated digital data, and a descrambling circuit for descrambling digital data based on the detection. 18
And an MC detection circuit 19 for detecting an MC signal as an identification signal,
An error correction circuit 20 for correcting data errors, and a frame batch error correction circuit for correcting data errors in frame units.
21 and a CP that extracts the ADPCM signal and the character signal from the corrected digital data, outputs the ADPCM signal to the ADPCM decoder 22, and outputs the character signal to the display control circuit 23.
With U24.

An audio signal different from the main program converted to analog by the ADPCM decoder 22 is supplied to the switching circuit 13 and is supplied to the display control circuit.
The display signal from 23 is given to LCD panel 25 and displayed.

The switching circuit 13 is configured to be switched by a user's operation, and is either an audio signal corresponding to the main program from the FM tuner unit 5 or an audio signal different from the main program from the multiplex signal demodulation unit 6. Is selected, amplified by the amplifier 26, and output from the speaker 27.

The FM multiplex broadcast receiver 2 is configured so that the IC card 3 can be attached and detached.
A program category of an ADPCM signal, a character signal and demodulated data, for example, an identification code indicating a category such as news, emergency news, weather forecast, and traffic information, a service identification code, and a program number are output to the IC card 3. It has become. Note that this identification code is included in the multiplexed signal data.

The IC card 3 includes a selection key 28 for selecting a program category to be recorded, an encoder 29 for generating a corresponding identification code according to the operation of the selection key 28,
The identification code from the encoder 29 and the multiplex signal demodulation unit 6
A comparator 33 is provided that compares the identification code from the CPU 24 with the two codes and turns on the gate circuit 30 to write the ADPCM signal and the character signal from the CPU 24 to the RAMs 31 and 32, respectively. The key 28 and the encoder 29 constitute selection means for generating an identification code corresponding to the selected program category.

As described above, when the identification card corresponding to the program category selected by the selection key 28 matches the identification code indicating the program category demodulated by the multiplex signal demodulator 6, the ADPCM signal and the character signal are Since the information is recorded in the RAMs 31 and 32, it is possible to record information on a desired program category, for example, news information from program categories such as news, emergency news, weather forecast, and traffic information. That is, by mounting the IC card 3 on the FM multiplex broadcast receiver 2 and operating the selection key 28, an ADPCM signal and a character signal corresponding to a desired program category, service identification code, program number, and the like are recorded. become.

The ADPCM audio signal and the character signal output from the CPU 24 of the multiplex signal demodulation unit 6 to the IC card 3 are the same as the data output from the CPU 24 to the ADPCM decoder 22 and the display control circuit 23.

The portable output device 4 for reproducing the ADPCM signal and the character signal recorded on the IC card 3 is configured separately from the FM multiplex broadcast receiver 2, and when reproducing data, The IC card 3 is mounted.

The output device 4 is operated according to an operation of an operation unit (not shown).
A CPU 34 for reading and outputting corresponding ADPCM signals and character signals from the RAMs 31 and 32 of the IC card 3;
An ADPCM decoder 36 that converts an ADPCM signal into an analog audio signal and outputs the same to an amplifier 35, a display control circuit 38 that converts a character signal into a corresponding display signal and outputs it to an LCD panel 37,
The speaker 39 is provided.

This output device 4 is small and portable because most of the receiving circuit and demodulation circuit are omitted as compared with the FM multiplex broadcast receiver 2.
The data recorded on the card 3 can be reproduced.

In the FM multiplex broadcast receiving apparatus 1 of the present invention having the above-described configuration, the FM multiplex broadcast receiver 2 receives and demodulates the FM multiplex broadcast and demodulates either the main program audio or the multiplexed audio, that is, the sub audio. Is output from the speaker 27, and
The display corresponding to the character signal is performed by the LCD panel 25.

Further, if necessary, the IC card 3 is mounted on the FM multiplex broadcast receiver 2, and a desired program category, service identification code, program number, and the like are selected, whereby the ADPCM demodulated by the multiplex signal demodulation unit 6 is selected. The signal and the character signal are written into the corresponding RAMs 31 and 32 of the IC card 3, respectively.

Then, by attaching the IC card 3 to the portable output device 4 and playing back the data recorded on the IC card 3, sound different from the main program is output from the speaker 39 and the character signal is output. Is displayed on the LCD panel 37.

In this embodiment, since the IC card 3 has a function of identifying a program category, a service identification code, a program number, and the like, information such as a different program category, service identification code, and program number is stored for each IC card. Can be recorded.

As another embodiment of the present invention, the data recorded on the IC card 3 may be reproduced by the FM multiplex broadcast receiver 2.

<Effect of the Invention> As described above, the FM multiplex broadcast receiver of the present invention includes an FM multiplex broadcast receiver, an IC card on which desired information demodulated by the FM multiplex broadcast receiver is recorded, and an IC card An output device that reproduces the information recorded on the device and performs audio output or display, so that information such as sub-audio and characters received and demodulated by the FM multiplex broadcast receiver is recorded on a removable IC card. By doing so, the information of the IC card can be easily reproduced and output by the output device having only the reproducing function.

Moreover, when the identification code corresponding to the selected program category matches the identification card indicating the program category demodulated by the multiplex signal demodulation unit, desired information is recorded on the IC card. , Emergency news,
It is possible to select and record information of a desired program category from program categories such as weather forecast or traffic information. Therefore, of course, information of different program categories can be recorded on one IC card,
Information of different program categories can be recorded on each of the IC cards.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a frequency spectrum of FM multiplex broadcasting. 1 ... FM multiplex broadcast receiver, 2 ... FM multiplex broadcast receiver,
3 ... IC card, 4 ... Output device.

Continued on front page (72) Inventor Shigeki Moriyama 1-10-11 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting Corporation Research Institute (72) Inventor Masayuki Takada 1-110-11 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting Corporation Inside the Broadcasting Research Institute (72) Inventor Satoshi Yamada 1-10-11 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting Corporation Broadcasting Research Institute (58) Field surveyed (Int.Cl. ⁶ , DB name) H04H 5/00 H04B 1/16-16/28

Claims (1)

(57) [Claims] 1. An FM multiplex broadcast, which multiplexes information such as a voice signal and a character signal other than a main program into an FM broadcast and transmits the multiplexed broadcast.
An FM multiplex broadcast receiver including an FM tuner section for performing FM detection and stereo demodulation, and including a multiplex signal demodulation section for demodulating the information multiplexed from the FM detection output of the FM tuner section, An IC card, which is detachable from the machine and in which desired information among the information demodulated by the multiplex signal demodulation unit is recorded, and wherein the IC card is detachable, and is recorded on the IC card. An output device that reproduces the information to perform audio output or display, wherein the information demodulated by the multiplexed signal demodulation unit includes an identification code indicating a program category of the demodulated data, and selects a program category. When the identification code from the selection means that generates a corresponding identification code in accordance with the selection operation for the identification code and the identification code demodulated by the multiplex signal demodulation unit match, the IC card FM multiplex broadcast receiving apparatus characterized by serial desired information is recorded.