JPH036129A - Fm multiplex receiver - Google Patents

Abstract

PURPOSE:To perform reproduction by reading out a memory arbitrarily by automatically recognizing the fact that traffic information broadcast is started, and storing the content of the broadcast in the memory. CONSTITUTION:When a vehicle engine is started up, a wave received with an antenna 10, if it is traffic information, is supplied to the input terminal of a frequency multiple demodulator 13, and voice data and character code data are demodulated at a QPSK demodulator 31, and sent to a code processing circuit 32. The circuit 32 separates the voice data and the characteristic code data from an input signal, and outputs the voice data to output 13a on one side and the character code data to the output 13b on the other side. A character code data decoder 33 separates an identification signal from the input signal, and writes it on the memory 14. In such a manner, the traffic information broadcast can be automatically stored in the memory 14 regardless of the opening/closing state of a radio power source switch 18. Consequently, the reproduction can be performed by reading out the memory arbitrarily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vehicle-mounted FM receiver, and is particularly capable of receiving traffic information broadcasts that are broadcast from time to time.

In addition, the received traffic information can be stored in the memory, and the traffic information can be read out from the memory and played back.
This invention relates to an M multiplex receiver.

[Background Art] Recently, as part of public information services, radio broadcasts have been conducted to provide road traffic information services to moving vehicles or some radio listeners.

Traffic information broadcasting uses so-called multiplex FM waves, in which information is transmitted using a carrier modulated by QPSK modulation, and the side that receives this broadcasting is equipped with a receiver equipped with a dedicated demodulator. It is necessary and has already been developed.

[Problem to be solved by the invention] The above-mentioned traffic information broadcast is not always broadcast, and the broadcast time slot is determined in advance.
It is broadcast for several minutes at intervals of 0 minutes or more.

Therefore, under these circumstances, a radio listener driving a vehicle cannot receive necessary traffic information at any given time.

Furthermore, if you miss a broadcast, you will have to wait at least 30 minutes until the next broadcast.

The present invention was developed in view of the above circumstances, and it is possible to automatically recognize that traffic information broadcasting has started, and also to automatically store the contents of the broadcast in memory and read it out from the memory and play it back. The purpose of the present invention is to provide an in-vehicle FM multiplex receiver that is possible.

[Means for Solving the Problems] In order to achieve the above object, the FM multiplex receiver of the present invention includes a tuner that receives broadcasting and outputs an FM demodulated signal, and a tuner that is included in the FM demodulated signal. an FM multiplex demodulator that demodulates a multiplexed signal to obtain a code for identifying audio data related to traffic information and traffic information broadcast; and a memory for sequentially writing and storing the audio data when the FM multiplex demodulator obtains the identification code. a first switch that is linked to the ignition switch of the vehicle and sets the voice data obtained by supplying power to each of the above parts when the switch is on so that the voice data obtained can be stored in memory; and a second switch for switching between an operation mode in which the audio data is reproduced and a reproduction mode in which the stored audio data is read and reproduced.

[Function] The FM multiplex receiver of the present invention includes the main parts of a tuner that receives broadcast waves, a multiplex demodulator that demodulates FM multiplex waves, and a memory that stores demodulated audio data. Each of these parts is independent of the radio's power switch.
Power is supplied through a first switch that opens and closes in conjunction with the ignition switch of the vehicle.

Therefore, as long as the vehicle ignition switch is on, the main parts to which power is supplied are always set in an operating state. If the received radio waves contain traffic information, this is identified and the demodulated audio data is automatically stored in memory. While receiving traffic information broadcasts, the audio data is stored in memory and can be played back in real time via a playback device, but when traffic information broadcasts are not being received, the second switch can be operated. By doing this, the memory can be read and played back.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
1 and 2 are block diagrams schematically explaining the FM multiplex receiver of the present invention.

In the figure, 10 is a receiving antenna, 11 is a tuner that receives incoming radio waves and selects a desired broadcast frequency, and includes an intermediate frequency amplifier and an FM demodulator that demodulates an FM modulated signal. A stereo multiplex decoder 12 demodulates the input signal into an H stereo audio signal.

Reference numeral 13 denotes an FM multiplex demodulator for demodulating QPSK-modulated traffic information signals contained in input radio waves, the details of which are shown in FIG. Note that this FM multiplex demodulator 13 is a QPS
It consists of a K demodulator 31, a code processing circuit 32, and a character/code data decoder 33.

The QPSK demodulator 31 is a circuit that demodulates a QPSK-modulated FM multiplex signal, and its output is a digital signal. F
The M multiplex signal includes a signal in which voice data such as ADPCM code and character code data are synthesized, and interleaved,
Contains a signal with an error correction code added.

The code processing circuit 32 separates the audio data and single character code data of the ADPCM code, performs de-interleaving and error correction, and outputs the separated audio data and character code data to two output terminals 13a and 13b, respectively. .

The character/code data decoder 33 discriminates from the input character code data whether there is an identification code included only in the traffic information broadcast,
When the identification code is obtained, the identification code rt 1 n is given to the output 13c, and when it is not a traffic information broadcast, the code JJ O is given to the output 13c.
Outputs ″′.

Next, 14 is a memory, which is a random access storage circuit for storing traffic information broadcasts as needed. Since the output 13C of the character/code data decoder 33 gives "'1" in the memory 14 when the traffic information broadcast starts,
Memory writing is performed using this code. Also,
When 11011 is given, reading becomes possible.

15 is a digital-to-analog converter that converts audio data related to traffic information into an analog audio signal. 1
6 is a vehicle battery for supplying power to each of the above-mentioned parts. A power supply circuit to which a predetermined voltage is supplied from the battery 16 is indicated by a dotted line in the figure. Note that the solid line is a signal circuit.

17 is a first switch that is interlocked with an ignition switch that starts the engine of the vehicle. While the vehicle is operating, this switch is closed, so tuner 11. FM multiplex demodulator 13. Power is supplied to the memory 14 and the memory 14, and these parts are set to an operating state. Further, 18 is a radio power switch, and when this switch 18 is closed, normal radio broadcasting can also be received, and all functions can be operated. And, 19a and 19b are switches for selectively switching between normal radio broadcasting and traffic information broadcasting, and two circuits of the same switch with contacts P and Q are provided.
When connected to contact P, an FM stereo broadcast and R channel audio signal is obtained at the switch output, and when switched to contact Q.

It is possible to obtain monaural traffic information broadcast output.

Next, 20 is a second switch that selectively switches and outputs the audio data of the FM multiplex demodulated traffic information broadcast. The output 13a of the code processing circuit 32 is connected to the contact P of this switch 20, and the output 13c of the character/code data decoder 33 is connected to the contact Q.

Next, when the vehicle engine is started by operating the ignition switch 6, which explains the operation of the receiver described above, the first switch 17 is closed and the power source of the vehicle battery 16 is supplied to the tuner 11, FM multiplex demodulator 13, and is supplied to the memory 14.

If the broadcast received by the antenna 10 is a normal FM broadcast, the output signal of the tuner 11 is sent to the multiplex decoder 12, so if you close the power switch 18 of the radio here, the stereo demodulated audio signal will be switched on. It is output to 19a and 19b.

If the radio waves received by the antenna 10 are traffic information broadcasts, a portion of the FM demodulated signal is supplied to the input terminal 30 shown in FIG. The QPSK demodulator 31 demodulates the ADPCM code audio data and character code data included in the signal component, and sends the encoded signal to the next stage code processing circuit 32. The code processing circuit 32 separates voice data and character code data from the input signal, and outputs the voice data to one output 13a and the character code data to the other output 13b.The one-character code data decoder 33 identifies from the input signal. When the signals are separated, "1" is given to the output 13c.

This signal functions as a control signal to control the memory 14, and when it is "1" it becomes a write mode in which the audio data output 13a is written into the memory 14, and when it is "0" it becomes a read mode in which the contents of the memory 14 are read out.

The writing mode of the traffic information broadcast to the memory 14 is independent of the open/closed state of the radio power switch 18, and is executed at the same time as the traffic information broadcast starts if the ignition switch of the vehicle is on.

That is, the traffic information broadcast is automatically stored in the memory 14 even if the vehicle is not listening to the radio while the vehicle is running, or even if an in-vehicle audio device other than the radio receiver is playing.

Note that the backup terminal BU of the memory 14 is always supplied with power from the battery 16, and the data stored in the memory 14 is saved.

Then, the next traffic information broadcast is received and the identification signal 13
When c changes from "O" to "1", the memory 14 is reset and rewritten with the latest information.

Furthermore, in the reproduction mode in which the received traffic information is listened to in real time, the switches 19a and 19b are switched to the contact Q side, and the second switch 20 is connected to the contact P side. Furthermore, if the switch 18 is turned on, all functions are set to standby, and the audio data output 13a is set to D.
After the signal is converted into an analog signal by the /A converter 15, it is reproduced through the switches 19a and L9b and an external amplifier and speaker (not shown).

Next, when reading the traffic information broadcast from the memory 14 and reproducing it, the switch 20 is switched to the contact Q side. In the memory playback mode, reading is possible when the character/code data decoder output 13e is "O", and by switching and operating the switch 20, the memories 1-4 execute reading. The memory 14 may be provided separately, and the RAJ4 capacity provided in the memory 14 must be considered so that it can completely cover the time of one traffic information broadcast, but the installation space or cost Since the capacity cannot be increased for some reason, the memory 14 may be provided with a fan bander/expander circuit that compresses information when writing and expands information when reading.

[Effects of the Invention] As described above, the FM multiplex receiver of the present invention includes a tuner, an FM multiplex demodulator, a memory for storing audio data, and a first switch linked to the vehicle ignition switch. The receiver is equipped with a second switch that switches between a mode for reproducing audio data in real time and a mode for reading and reproducing stored audio data, so when the vehicle ignition switch is on, the receiver is always configured to broadcast traffic information The system is set to be ready for reception, traffic information broadcasting starts, and the audio data is automatically stored in memory.

Therefore, while the vehicle is running, there is no need to operate the receiver to store traffic information broadcasts. When a traffic information broadcast is received, the audio data can be played back in real time, or when there is no traffic information broadcast, the audio data can be read out and played back at any time from the memory that stores the latest traffic information. This eliminates the hassle of waiting for the start of broadcasting.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an FM multiplex receiver according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the main parts of FIG. 1. 11...Tuner, 13...
...FM multiplex demodulator, 13a...Audio data output, 13c...Identification code output, 14...
・・・・・・Memory, 15・・・・・・・・・D/A
Converter, 16...Battery power supply, 17
......First switch, 20...
...Second switch, 31...Q P
S K demodulator, 32... code processing circuit,
33...Character/code data decoder. Figure 2

Claims (1)

[Claims] a tuner that receives broadcasting and outputs an FM demodulated signal; and an FM multiplex demodulator that demodulates multiplexed signals included in the FM demodulated signal and obtains a code for identifying audio data related to traffic information and traffic information broadcasting. , a memory for sequentially writing and storing the audio data when the FM multiplex demodulator obtains the identification code, and a memory that is linked to the ignition switch of the vehicle and supplies power to each of the above parts when the switch is on. a first switch that sets the audio data to a state where it can be stored in a memory; a second switch that switches between an operation mode in which the audio data is played back in real time and a playback mode in which the stored audio data is read and played back; An FM multiplex receiver comprising: