KR0174209B1 - Matrix controlling circuit using kbps data - Google Patents

Abstract

The present invention relates to a matrix control circuit of a voice multiplexed VCR capable of decoding a KBPS reception data to determine a voice multiplex broadcasting system, and more particularly to a matrix control circuit for accurately detecting a voice multiplex broadcasting system even in a poor reception area where the electric field strength is weak or reception is poor To make it possible.

To this end, the present invention comprises a frequency tuning unit for tuning a desired channel from a high-frequency (RF) signal of a composite channel received from an antenna; An SIF detector for extracting only an intermediate frequency signal (SIF) for a voice signal from the panel signal tuned in the frequency tuner; A first carrier detector and a second carrier detector for extracting a first carrier and a second carrier from the voice intermediate frequency signals extracted by the SIF detector; A KBPS decoding unit decoding the KBPS data; A microprocessor for receiving detection information decoded through the KBPS decoding unit and performing various control operations for a stereo broadcast, a mono broadcast, or a bilingual broadcast; A pilot bit detector for changing a switching signal under the control of the microprocessor; A matrix circuit for combining the actual voice output signals of the L and R channels by switching or adding / subtracting the outputs of the two carrier detectors according to the switching signal of the pilot bit detector; And a first audio output unit and a second audio output unit for amplifying the audio signal synthesized by the matrix circuit unit and outputting the amplified audio signal to the outside through respective speakers.

Description

Matrix control circuit using KBPS data of voice multi-VCR

FIG. 1 is a block diagram illustrating an embodiment of a conventional two-carrier voice multiplex broadcast receiving and processing system; FIG.

FIG. 2 is a block diagram illustrating an embodiment of a matrix control circuit using KBPS reception data in a two-carrier voice multiplexed broadcast receiving and processing circuit according to the present invention.

FIG. 3 is a reference table showing an example of KBPS reception data for use in the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

10: frequency tuning unit 20: SIF detection unit

31, 32: Voice Detection Unit 40: Matrix Circuit Unit

71, 72: audio output unit 80: KBPS decoding unit

90: Microprocessor 100: Pilot bit detector

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video cassette recorder (hereinafter, referred to as a VCR) capable of receiving a voice multiplex broadcasting signal, and more particularly to a voice cassette recorder (Hereinafter referred to as " KBPS ") data, and controls the matrix circuit, which is the voice signal switching processing means, according to the audio multiplex broadcasting system of the program, And more particularly, to a matrix control circuit using KBPS data of a voice multiplexed VCR capable of reliably detecting a voice multiplex broadcasting system even in a poor reception area.

In general, voice multi-broadcasting can be divided into stereo broadcasting and simultaneous broadcasting in two languages. Such multi-broadcasting can be divided into FM-FM (FM-FM) method implemented in Japan and 2 Carrier (AM-FM) system implemented in the United States and the like.

FIG. 1 shows an embodiment of a conventional receiving system for a multi-carrier multi-broadcasting system in two or more types of voice multi-broadcasting systems as described above.

Here, a frequency tuning unit 10 for tuning a desired channel from a high frequency (RF) signal of a composite channel received from an antenna, and a frequency tuning unit 10 for extracting only an intermediate frequency signal SIF for a voice signal from the channel signal tuned in the frequency tuning unit (4.5 MHz) of the intermediate frequency signal extracted from the SIF detector is filtered by the first bandpass filter 31A to obtain a first carrier frequency of 4.5 MHz, Demodulates the audio signal (L + R) / 2 and the main audio signal frequency-modulated in frequency by the FM demodulator 31B and then amplifies it through the amplifier 31C (4.72 MHz) among the intermediate frequency signals extracted by the SIF detector is filtered by a second band pass filter (32A) to obtain a second carrier wave of 4.72 MHz Lt; / RTI > to 4.72 MHz, (FM) demodulator 32B to demodulate the received voice signal (LR) / 2 and the sub-voice (foreign language) signal, and amplify the demodulated voice signal (LR) / 2 through the amplifier 32C (55.1 kHz) from the signal filtered through the second carrier detector and the third band pass filter 60A, and outputs the demodulated signal to the AM demodulator 60B A pilot signal detector 60 for extracting an incoming pilot signal which is amplitude-modulated at 55.1 kHz by AM demodulation through a pilot signal detecting unit, a stereo / dual switching unit 60 for outputting a switching control signal according to the pilot signal extracted from the pilot signal detecting unit, (50) for synthesizing the actual audio output signals of the L and R channels by switching or adding / subtracting the output of the two audio detection units according to the switching control signal of the stereo / dual switching unit And a first audio output unit 71 and a second audio output unit 72 for amplifying audio signals synthesized by the trick circuit unit 40 and the matrix circuit unit 40 and outputting them to the outside through respective speakers .

The conventional multi-channel audio signal reception and processing circuit of this configuration generally tunes a high-frequency signal of a composite channel to be received from an antenna through a frequency tuning unit 10 to obtain a frequency signal of a desired channel, The intermediate frequency signal SIF for the audio signal is extracted while passing through the unit 20 and the intermediate frequency signal for the video signal is extracted through the VIF detection unit although not shown in the figure.

The intermediate frequency signal SIF for the voice signal extracted from the SIF detector 20 is transmitted to the first bandpass filter 31A and the second carrier detector 32 of the first carrier detector 31, (4.5 MHz or 4.72 MHz) while passing through the second band-pass filter 32A of the FM demodulator 31B and 32B, respectively, and then subjected to FM demodulation by the respective FM demodulators 31B and 32B (L + R) / 2) frequency-modulated in the first carrier wave of 4.5 MHz by being amplified to a predetermined level through each of the amplifiers 31C and 32C (LR) / 2 and a sub-audio (foreign language) signal, which are frequency-modulated on the second carrier wave 4.72 MHz, are extracted by the second carrier detector 32, And is applied to the two input terminals of the circuit portion 40.

The pilot signal detector 60 detects the frequency of the frequency band of 55.1 kHz from the third bandpass filter 60A through the second bandpass filter 32A of the second carrier detector 32, Dual demodulator 60B to demodulate the demodulated pilot signal to extract a pilot signal that is amplitude-modulated with the broadcast signal and apply the extracted pilot signal to the stereo / dual switching unit 50. The stereo / (50) changes the switching control signal according to the pilot signal extracted from the pilot signal detecting unit and outputs it.

Accordingly, the matrix circuit unit 40 can selectively output a single broadcast, a stereo broadcast, or a bilingual broadcast according to a switching control signal of the stereo / dual switching unit. That is, in the case of the single broadcasting, only the voice signal of the first carrier detector 31 is output. In the case of the stereo broadcasting, the two voice signals of the two carrier detectors 31 and 32 are added (L + (L + R) / 2- (LR) / 2 (LR) / 2 = L) to synthesize an L channel audio signal and simultaneously subtract two audio signals of the two carrier detectors 31 and 32 ) / 2 = R) to synthesize R-channel audio signals. In case of dual broadcasting, the matrix circuit unit 40 is turned off to transmit the Korean speech signal coming on the first carrier and the foreign language speech signal coming on the second carrier L channel, and R channel, respectively, so that mono broadcast, stereo broadcast, and bilingual simultaneous broadcast signals are synthesized and output to the outside through the respective audio output units 71 and 72. [

However, in the conventional VCR system having the multi-channel audio multi-broadcasting receiving and processing function, the pilot signal for discriminating the multi-channel broadcasting is detected from the high frequency signal received through the antenna and the switching operation of the matrix circuit is controlled, The pilot signal for discriminating the MULTI-type multi-channel broadcasting system often can not be detected. Therefore, when the switching operation of the matrix circuit unit is not properly controlled and the reception state is poor, There is a disadvantage in using.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a method and apparatus for decoding a KBPS data to determine a voice multiplex broadcasting scheme of a currently received broadcast signal, By directly controlling the switching operation, the KBPS data (KBPS data) of the voice multiplexed VCR capable of positively utilizing the voice multiplex broadcasting by making it possible to reliably detect the voice multiplex broadcasting in the weak reception area where the electric field strength is weak or the receiving state is poor, And a matrix control circuit using the matrix control circuit.

According to an aspect of the present invention, there is provided a radio communication system including a frequency tuning unit for tuning a desired channel from a high frequency (RF) signal of a composite channel received from an antenna; An SIF detector for extracting only an intermediate frequency signal (SIF) for a voice signal from the panel signal tuned in the frequency tuner; A first carrier detector and a second carrier detector for extracting a first carrier and a second carrier from the voice intermediate frequency signals extracted by the SIF detector; A KBPS decoding unit decoding the KBPS data; A microprocessor for receiving detection information decoded through the KBPS decoding unit and performing various control operations for a stereo broadcast, a mono broadcast, or a bilingual broadcast; A pilot bit detector for changing a switching signal under the control of the microprocessor; A matrix circuit for combining the actual voice output signals of the L and R channels by switching or adding / subtracting the outputs of the two carrier detectors according to the switching signal of the pilot bit detector; And a first voice output unit and a second voice output unit for amplifying voice signals synthesized by the matrix circuit unit and outputting the amplified voice signals to the outside through respective speakers. Thereby providing a control circuit.

Hereinafter, a matrix control circuit using KBPS data of a voice multiplexed VCR according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram showing an embodiment of a matrix control circuit using KBPS data in a two-carrier multi-channel broadcast receiving and processing circuit according to the present invention. In the figure, a high frequency (RF) An SIF detector 20 for extracting only an intermediate frequency signal SIF for a speech signal from the channel signal tuned in the frequency tuner, (4.5 MHz) of the intermediate frequency signal is filtered by the first band pass filter 31A to obtain 4.5 MHz, which is the first carrier frequency, and the voice signal (L + R) / A first carrier detector 31 for FM demodulating the main voice signal and the main voice signal through an FM demodulator 31B and amplifying the signal through an amplifier 31C and extracting the amplified signal, part (4.72 MHz) among the intermediate frequency signals extracted from the intermediate frequency signal is filtered by the second band pass filter 32A to obtain the second carrier wave 4.72 MHz, and the voice signal (LR The second carrier detector 32 for FM demodulating the FM signal demodulated by the FM demodulator 32B and amplifying the FM signal through the amplifier 32C and extracting it by the amplifier 32C, As shown in FIG.

As a main part of the present invention, a KBPS decoding unit 80 for decoding KBPS data (KBPS DATA) and detection information decoded through the KBPS decoding unit are input to a system for simultaneous broadcasting of stereo broadcasting, monaural broadcasting or bilingual broadcasting A microprocessor 90 for performing various control operations, and a pilot bit detector 100 for outputting a switching signal according to the control of the microprocessor.

A matrix circuit unit 40 for switching the outputs of the two carrier detectors according to the switching signal of the pilot bit detector and adding / subtracting the outputs of the two carrier detectors to synthesize actual voice output signals of the respective L and R channels; The first audio output unit 71 and the second audio output unit 72, which amplify the audio signal synthesized by the first and second audio output units 40 and 40 and output the amplified audio signals to the outside through the respective speakers, are configured in the same manner as in the conventional case.

FIG. 3 is a Palm chart showing an example of a KBPS data array for use in the present invention. For example, data can be set to S (or 1) in the case of a stereo broadcasting system, and data can be set to M (0 in the case of a mono broadcasting system) or D (or 10) Data can be set.

The operation of the matrix control circuit using the KBPS data according to the present invention will now be described.

First, a high-frequency signal of a composite channel received from an antenna is channel-tuned by a frequency tuning unit 10 to obtain a frequency signal of a desired channel, and the channel signal is transmitted through an SIF detector 20 to an intermediate frequency The signal SIF is extracted.

The intermediate frequency signal SIF for the speech signal extracted from the SIF detector 20 is input to the first band pass filter 31A and the second carrier wave detector 32 of the first one carrier detector 31, (4.5 MHz or 4.72 MHz) while passing through the second band-pass filter 32A of the FM demodulator 31B and 32B, respectively, and then subjected to FM demodulation by the respective FM demodulators 31B and 32B (L + R) / 2) frequency-modulated in the first carrier wave of 4.5 MHz by being amplified to a predetermined level through each of the amplifiers 31C and 32C (LR) / 2 and a sub-audio (foreign language) signal, which are frequency-modulated on the second carrier wave 4.72 MHz, are extracted from the main carrier wave and the second carrier wave detector 32, And is applied to the two input terminals of the circuit portion 40.

Meanwhile, the KBPS decoding unit 80 decodes the KBPS data, which is arranged in the same manner as in the third example, to decode the data bits indicating the voice multiplex broadcasting scheme, and extracts digital type pilot bits and applies them to the microprocessor 90.

Accordingly, the microprocessor 90 determines a voice multiplex broadcasting system such as a mono broadcast (0), a stereo broadcast (1), or a bilingual simultaneous broadcast (10) according to the digital value extracted in the above, The pilot bit detecting unit 100 changes the switching signal according to the signal output from the microprocessor and outputs the switching signal to the bit detecting unit 100. The matrix circuit unit 40 detects the pilot signal according to the switching signal of the pilot bit detecting unit 100 A single broadcast, a stereo broadcast, or a bilingual broadcast, respectively. That is, in the case of a single broadcast, only the extracted signal of the first carrier detector 31 is output, and in the case of the stereo broadcast 10, two audio signals of the two carrier detectors 31 and 32 are added Channel audio signal and synthesizes R-channel audio signals by subtracting the two audio signals of the two carrier detectors 31 and 32. In case of dual broadcasting, the matrix circuit unit 40 ) And outputs the main audio signal carried on the first carrier wave and the sub-audio signal carrying the second carrier wave on the L channel and the R channel as they are, thereby synthesizing the mono broadcasting, the stereo broadcasting and the bilingual broadcasting signal And output to the outside through the respective audio output units 71 and 72. FIG.

As described above, according to the matrix control circuit using the KBPS data of the speech multi-VCR according to the present invention, it is possible to provide a matrix control circuit using voice multiplex broadcasting discrimination data inserted and transmitted in current broadcast- By controlling the matrix circuit, the voice multiplex broadcasting can be more actively used even in weak electric field areas or poorly received reception areas, so that the efficiency of the voice multiplex broadcasting system can be enhanced and also the malfunction It is useful to prevent the problem.

Claims (1)

A frequency tuning unit for tuning a desired channel from a high-frequency (RF) signal of a composite channel received from an antenna; An SIF detector for extracting only an intermediate frequency signal (SIF) for a voice signal from the panel signal tuned in the frequency tuner; A first carrier detector and a second carrier detector for extracting a first carrier and a second carrier from the voice intermediate frequency signals extracted by the SIF detector; A KBPS decoding unit decoding the KBPS data; A microprocessor for receiving detection information decoded through the KBPS decoding unit and performing various control operations for a stereo broadcast, a mono broadcast, or a bilingual broadcast; A pilot bit detector for changing a switching signal under the control of the microprocessor; A matrix circuit for combining the actual voice output signals of the L and R channels by switching or adding / subtracting the outputs of the two carrier detectors according to the switching signal of the pilot bit detector; And a first voice output unit and a second voice output unit for amplifying voice signals synthesized by the matrix circuit unit and outputting the amplified voice signals to the outside through respective speakers. Control circuit.