KR0139170B1 - Speaker headphone switching system in the mts/stereo receiver - Google Patents

Abstract

The present invention relates to the switching between the speaker and the headphone switching in the US television broadcasting system, the speaker / headphone switch for television in the US voice multiple system that outputs the audio signal of the speaker and the headphone in a different voice during the voice multiple broadcast Its purpose is to provide a perfection or device.

In order to achieve the above object, a configuration of the present invention is provided in a television system configured to separately process and output transmitted audio component signals under a US voice multiplex system that transmits a plurality of voice signals in an allocated frequency range. SAP determination means for determining the presence or absence of a signal, selection means for selecting which of the L, R signal and the SAP signal, which are audio components, to be output to a speaker or a headphone, any one of the L, R signal and the SAP signal A switching means for switching a signal to be output to a speaker or a headphone according to a control signal, and controlling the switching means based on the selection of the selection means and the determination of the SAP determination means to reverse the audio output of the speaker from the audio output of the headphones. It characterized in that it comprises a control means for controlling switching so that the voice of the output.

Description

Speaker / headphone switch changer for television in US voice multiple systems.

1 is a diagram showing the frequency configuration of a US television audio signal;

2 is a block diagram of an MTS receiver configured to receive and process a composite speech signal configured as shown in FIG. 1;

3 is a block diagram of a speaker / headphone switch switching apparatus for television in a US multiple voice system according to the first embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

1: main channel 2: pilot

3: Stereo Subchannel 4: SAP Subchannel

5: Professional Channel 6: Antenna

7: Tuner 8: Voice IF Circuit

9: FM detector 10: 1H LPF (15.734 KHz)

11: 2H BPF (31.468 KHz) 12: 1H BPF (15.734 KHz)

13: 5H BPF (78.67 KHz) 14: De-emphasis vs. phase circuit

15: L-R DSBSC Demodulator 16: Phaselock Loop Circuit

17: SAP demodulator 18: first DBX decoder

19: second DBX decoder 20: demetric circuitry

21: first switching unit 22: AF amplification unit

23: second switching unit 24: speaker

25: headphones 31: remote control

32: receiving unit 33: switching unit

34: first AF amplifier 35: second AF amplifier

36: control unit

The present invention relates to the switching of the speaker and the headphone switching in the US television broadcasting system, the speaker / headphone for television in the US voice multiple system to output the audio signal of the speaker and the headphone in a different voice during the voice multiple broadcasting It relates to a switch switching device.

The audio signal of US television is different from the audio signal composition of Korea. While the audio signal configuration of Korea is based on the two-carrier method, the audio signal configuration method of the US is MTS / stereo method, that is, each signal constituting the audio signal can be separately processed in the receiver. This is a method of transmitting in another frequency range.

FIG. 1 is a diagram showing the frequency configuration of the US television audio signal, showing the respective audio signals distributed in a baseband of 120 khz allocated in the RF spectrum.

In FIG. 1, the subscript H corresponds to 15.734 khz, and subcarriers of each subchannel are integer multiples of H. In FIG. Reference number 1 is a broadcast signal for both mono and stereo, with a frequency range of 50Hz to 15khz, a frequency deviation of ± 25khz for 100% modulation, and is processed on both mono and stereo receivers. The output main channel, 2, is a pilot signal of 15.734khz (1H) used for synchronizing and phase locking of MTS signals and functions, and 3 is 31.468khz (2H). ) A sub-carrier left minus right (LR) double sideband, which is a stereo subchannel with an amplitude of 50 kHz to increase the signal-to-noise ratio of 13 kHz, and 4 is the second language. Secondary audio subchannel (SAP) consisting of sidebands of 78.67khz (5H) subcarriers, assigned to frequency bands for a special program such as 5, and a profile with a subcarrier of 102.371khz. Channel is a channel (Professional Channnel).

2 is a block diagram of an MTS receiver configured to receive and process a composite speech signal configured as shown in FIG. 1, wherein reference numeral 6 is an antenna, 7 is a tuner for tuning a specific broadcast signal among broadcast signals received from the antenna 6; 8 is an audio IF circuit unit which detects an audio signal from the composite video audio IF signal and outputs a 4.5 MHz audio IF signal, 9 is an FM detector for detecting a complex audio signal from the audio IF signal, and 10 is a mono ( 15.734 (1H) KHz first lowpass filter to detect L + R) signal, 11 is 31.468 (2H) KHz second bandpass filter to detect stereo (LR) signal from the composite speech signal 12, a third bandpass filter of 15.734 kHz (1H) for detecting a pilot signal from the composite video signal, and 13 a second audio program (SAP) signal from the composite video signal. 4th bandpass fill of 78.67khz (5H) detected (bandpass filter), 14 de-emphasizes the mono (L + R) signal detected by the first lowpass filter 10, and when the stereo signal is received by the first DBX decoder 18 of the LR subchannel De-emphasis and phase comparison circuit section for delaying the mono signal in order to finish the phase of the mono signal in the appearing phase conversion, 15 amplifies the stereo signal LR detected by the second band pass filter 11 and then LR LR DSBSC demodulator demodulating to recover the sideband signal, 16 phase locks the subcarrier of the LR DSBSC demodulator 15 to the phase of the pilot signal detected by the third bandpass filter 28. 2H phase lock loop circuit, 17 is an SAP demodulator for demodulating the SAP signal detected by the fourth band pass filter 13, 18 is the LR DSBSC demodulation A first DBX decoder for removing noise from the LR stereo signal demodulated by (15), 19 is a second DBX decoder for removing noise from the SAP signal demodulated by the SAP demodulator 17, and 20 is the de-emphasis; The matrix circuit unit 21 which processes and combines the L + R signal of the phase comparison circuit unit 14, the LR signal of the first DBX 18, and the SAP signal of the second DBX decoder 19 to output L and R SAP signals, 21. The first switching unit 22 for selectively outputting one of the stereo (L, R) signal and the SAP signal, which are output signals of the matrix circuit unit 20, to the dual AF amplifier 22 according to the viewer's selection, An AF amplifier for driving the speaker by amplifying the output signal of the first switching unit 21, 23 outputs the signal amplified by the AF amplifier 22 through the headphones 25 or the speaker 24 The second switching unit to select whether or not, 24 is a speaker, 25 The headphones.

Looking at the audio processing of the television having the above configuration, the audio signal transmitted from the broadcasting station is converted into each audio signal (L + R, LR, SAP) by the respective filters (first, second, third, and fourth filters). After detection, these signals are processed and output to the speaker 24 or the headphone 25 according to the viewer's choice.

In the above configuration, since the L, R, and SAP signals processed by the matrix circuit unit 20 are selected by the first switching unit 21 and output to the speaker 24 or the headphone 25, the speaker The sound of the 24 and the headphone 25 is always outputting the same sound. Therefore, the broadcast voice that a viewer can listen to on one television is only one of stereo or SAP regardless of whether it is output to the headphone 25 or the speaker.

Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a speaker / headphone switch switching apparatus for television in an American multiplex system, in which a viewer can freely select an audio signal output to headphones or speakers. There is this.

A speaker / headphone switch switching apparatus for television in the US voice multiple system according to the present invention for realizing the above object is provided under the US voice multiple system which transmits a plurality of voice signals in an allocated frequency range, A television for separating and outputting the respective audio signals, comprising: an SAP determination means for determining the presence or absence of an SAP audio signal, and a selection means for selecting which of audio signals L, R and SAP signals to be output to a speaker or a headphone And switching means for switching one of the L and R signals and the SAP signal to a speaker or a headphone according to a control signal, and controlling the switching means based on selection of the selection means and determination of the SAP determination means. Switching the speaker's audio output so that the audio output is opposite to that of the headphones Characterized in that configured to include a control means.

According to the present invention having the above-described configuration, when a broadcasting station carries an SAP audio signal to an audio signal and transmits the audio signal to a television, the viewer outputs a stereo (L, R) audio signal to the speaker of the television or SAP. On the basis of the selection, the control means controls the switching means so that the switching means controls the stereo sound or the SAP voice to the speaker and the SAP voice or the stereo sound to the headphone. do.

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings.

FIG. 3 is a block diagram of a speaker / headphone switch switching apparatus for television in a U.S. multiplex system according to the present invention, in which the same parts as in FIG.

In FIG. 3, reference numeral 31 denotes a remote controller including an output voice selection terminal of the speaker and a plurality of selection terminals, 32 is a receiving unit for detecting and processing an output signal of the remote control 31, 33 is an L of the matrix circuit unit 20; , Switching unit for switching the SAP signal to the first and second AF amplifiers 34 and 35 of the speaker 24 and the headphone 25 according to the control signal of the control unit 36 to be described later, 34 is input A first AF amplifier for driving the speaker 24 by amplifying the voice signal (L, R or SAP), 35 is a second AF amplification for driving the headphone 25 by amplifying the input voice signal (L, R or SAP) The control unit 36 is a control unit that controls the switching unit 33 based on the reception signal of the reception unit 32 and the output signal of the second DBX decoder 19.

Next, the operation of the apparatus having the above configuration will be described.

First, when the broadcasting station loads an audio signal having the configuration as shown in FIG. It is processed separately by IF signal. The audio IF signal separated from the composite video signal is demodulated by the FM detector 9 and restored to the composite audio signal.

The composite voice signal is again transmitted by the first low pass filter 10 and the second, third, and fourth band pass filters 11, 12, and 13 to the signals L + R, LR, Pilot, and SAP. L + R signals of the main channel separated by the first low pass filter 10 are de-emphasized when the audio output of the television is mono, and then output to the matrix circuit unit 20. . In addition, when the audio output mode of the television is stereo, it is phase-converted and output to the matrix circuit unit 20 so as to match the phase with the L-R signal. In addition, the LR signal detected by the second band pass filter 11 is demodulated into a 31.468khz subcarrier phase locked by a pilot signal detected by the third band pass filter 12, and then a first DBX decoder ( The noise is removed by 18) and output to the matrix circuit unit 20. The SAP signal detected by the fourth band pass filter 13 is, like the LR signal, demodulated to a subcarrier of 78.76khz, and after the noise is removed by the second DBX decoder 19, the matrix. Output to the circuit unit 20.

Subsequently, each of the signals L + R, L-R, and SAP voice signals input to the matrix circuit unit 20 are matrixed by the matrix circuit unit 20 to output L, R, SAP voice signals. In this case, when the viewer selects the audio output of the speaker as the SAP voice signal by using the remote controller 31, the controller 36 controls the switching unit 33 based on the output signal of the second DBX decoder 19 to control the SAP voice. The signal is output to the speaker 24 and the stereo signals L and R are output to the headphone 25. On the contrary, when the viewer selects the stereo as the speaker 25, the control unit 36 performs the opposite switching control. If the broadcasting station does not send the SAP signal, the control unit 36 detects the fact that the output signal of the second DBX decoder 19 detects the output of the headphone 25 and the speaker 24 and the conventional headphone / speaker. It is controlled by the output method.

Therefore, in the above configuration, the US voice multiple system (MTS / stereo) can listen to stereo (or SAP) with a speaker and SAP (or stereo) with headphones.

As described above, according to the present invention, it is possible to realize a TV speaker / headphone switch switching device in the US voice multiple system in which different voice signals are selectively output between the speaker and the headphone.

Claims (1)

In the US voice multiplex system that transmits a plurality of voice signals in the assigned frequency range and transmits the following, the television to separate and output the transmitted audio component signals, respectively, SAP determination means for determining the presence or absence of the SAP voice signal, Selection means for selecting which of the audio configuration signal L, R signal or SAP signal to be output to the speaker or headphones, Switching means for switching one of the L and R signals and the SAP signal to a speaker or a headphone according to a control signal; And controlling means for controlling the switching means based on the selection of the selection means and the determination of the SAP determination means to control switching of the voice output of the speaker to output voice opposite to the voice output of the headphones. Speaker / headphone switching device for television in the US voice multiple system.