JPH0531373U - Radio receiver - Google Patents

Abstract

(57) [Abstract] [Purpose] DSP suitable for broadcast content in RDS data
Provide a radio receiver in which the mode is automatically selected. [Structure] The microcomputer 11 has a PIN (program type) code of the RDS data input from the synchronizer 10, M
/ S (music / speech classification) code or TA (traffic information broadcasting display) code etc. determine the optimum DSP mode (hall simulation mode etc.) for broadcast contents, and also determine DSP on / off to signal to DSP4 Is output to set the DSP operation mode, or the DSP operation is turned on / off.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a radio receiver which receives RDS data and has a DSP, and more particularly to a DSP mode setting means for the radio receiver.

[0002]

[Prior Art]

 Conventionally, there is known an RDS (radio data system) in which a receiver has various functions by adding an inaudible signal to a VHF-FM broadcast signal. Such RDS data includes PI (program recognition) code, TP (traveler broadcast display) code and frequency list of the same network, and automatically switches to another station when the radio wave condition deteriorates. It also enables functions such as automatic switching to traffic information broadcasting.

Further, a radio receiver using a DSP (Digital Signal Processor) which gives various sound field effects by processing a digitized audio signal is also known. However, a radio receiver that automatically sets the DSP mode based on RDS data has not been known.

[0004]

[Problems to be solved by the device]

 In the above-mentioned conventional radio receiver, when listening to FM music programs and setting the DSP, for example, in the concert hall mode, next time the program changes to news, the DSP must be switched to the conversation mode. There was a problem that it became difficult to hear the broadcast contents.

The present invention has been made in view of the above points, and an object thereof is to provide a radio receiver in which a DSP mode suitable for broadcast contents in RDS data is automatically selected. To provide.

[0006]

Means for Solving the Problems A radio receiver of the present invention is capable of receiving RDS data, and a radio receiver equipped with a DSP is provided with a means for automatically selecting a DSP mode according to RDS data. It is a thing.

[0007]

[Action]

 The RDS data includes PIN data indicating the program type, TA code indicating the traffic information broadcast, and the like, and the music of the broadcast content, the distinction of conversation, the type of music, etc. are discriminated from these data. When the broadcast content is discriminated in this way, the DSP mode most suitable for the content is determined, and the mode setting signal is output to the DPS, and the operation mode is automatically switched to the mode determined as described above.

[0008]

【Example】

 A radio receiver according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a radio receiver which is an embodiment of the present invention. In the figure, reference numeral 1 is a front end, which has a local oscillator and a mixer. The output of the local oscillator having a frequency set by the microcomputer 11 is mixed with the received signal to amplify and detect the intermediate frequency signal. Output to the container 2.

The intermediate frequency amplifier / detector 2 amplifies the input intermediate frequency signal and then FM demodulates it, and outputs the demodulated signal to the noise canceller / stereo demodulator 3 and the band pass filter 8.

The noise canceller / stereo demodulator 3 cuts high-frequency noise from the input signal to generate an R channel and L channel stereo audio signal, and outputs it to the DSP 4.

The DSP 4 has an AD converter that converts an analog input signal into a digital signal and a DA converter that converts a digital signal into an analog signal and outputs the signal. The DSP 4 processes the digital signal with a digital filter or a delay circuit, and The operation mode is set by a signal from the micro computer 11.

The R channel audio signal output from the DSP 4 has its gain adjusted by the volume 5, amplified by the amplifier 6, and drives the speaker 7. Similarly, the gain of the L channel audio signal output from the DSP 4 is adjusted by the volume 5a, amplified by the amplifier 6a, and drives the speaker 7a.

The signal demodulated by FM in the intermediate frequency amplifier / detector 2 and output to the bandpass filter 8 is extracted into a band of a constant width having a center frequency of 57 Hz and output to the RDS demodulator 9. The RDS demodulator 9 demodulates the RDS signal from the input signal and outputs the demodulated RDS signal to the synchronizer 10. The synchronizer 10 separates the RDS data and outputs it to the microcomputer 11 while synchronizing with the input signal.

The microcomputer 11 has a built-in ROM and RAM, operates according to a program recorded in the ROM and a signal from the key operation unit 12, outputs an oscillation frequency setting signal of a local oscillator to the front end 1, A signal for displaying the reception channel, the DSP mode, etc. is output to the display unit 12, and further, a signal for setting the operation mode is output to the DSP 4.

In the above structure, when the DSP mode is automatically set by the key operation unit 12, the microcomputer 11 causes the PIN (program type) code and M / S (music / speech classification) of the RDS data input from the synchronizer 10. Determine the DSP mode (hall simulation mode, etc.) that is most suitable for the broadcast content indicated by the code or TA (traffic information broadcasting display) code, etc. Also, determine the DSP on / off and output a signal to the DSP4 to operate the DSP. Set the mode or turn DSP operation on and off.

When the DSP mode is manually set by the key operation unit 12, the DSP operation mode is set or the DSP operation is turned on / off by key operation.

[0017]

[Effect of the device]

 According to the radio receiver of the present invention, the operation mode of the DSP such as the on / off switching of the DSP and the hall simulation is set according to the data of the RDS, so that the listener does not need to perform a troublesome operation.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a radio receiver that is an embodiment of the present invention.

[Explanation of symbols]

 1 Front End 2 Intermediate Frequency Amplifier / Detector 3 Noise Canceller / Stereo Demodulator 4 DSP 5 Volume 6 Amplifier 7 Speaker 8 Bandpass Filter 9 RDS Demodulator 10 Synchronizer 11 Microcomputer 12 Key Operation Section 13 Display Section

Claims (1)

[Scope of utility model registration request] 1. A DSP capable of receiving RDS data,
Radio receiver equipped with
A radio receiver provided with means for automatically selecting an SP mode.