KR960015503B1 - Sound compensation circuit of multi-t.v. receiver - Google Patents

Abstract

an intermediate frequency circuit means(20) outputting the frequency-modulated sound data by playing it, among the composite video signal picked-up through a tuner(1); a filter means(30) filtering the sound data outputted from the intermediate frequency circuit means(20) in some bandpass band; an integrating means(40) integrating the data outputted from the filter means(30); and a control means(50) controlling the operation of trap circuits(T1,T2) by the control signal outputted from the integrating means(40).

Description

Sound Sound Compensation Circuit of Multi TV Receiver

1 is a general multi-TV circuit block diagram produced by the prior art.

2 is a diagram showing a sound sound compensation circuit of a multi-tv receiver according to the present invention.

* Explanation of symbols for the main parts of the drawings

10 tuner 20 medium frequency circuit means

30: filter means 40: integral means

50: control means T1: first trap circuit

T2: second trap circuit TRl, TR2: switching element

R1, R2: Resistor C1: Condenser

The present invention relates to a sound sound compensation circuit of a multi-television receiver, and more particularly, even if the SECAM broadcasting system and the PAL broadcasting system in Eastern Europe are viewed in a multi-television that satisfies German safety rules. The present invention relates to a sound sound compensation circuit of a multi-tv receiver capable of listening to normal sound sound.

In general, a multi-television television is constructed as shown in FIG. 1, which includes a tuner 1 for picking up a broadcast signal received from an antenna ANT, and a video signal and an audio signal from a signal input through the tuner 1. Intermediate frequency circuit section (2) for processing signals, audio signal processing section (3) for processing audio signals demodulated by the intermediate frequency circuit section (2), video signal processing section (4) for processing video signals, horizontal synchronization and vertical synchronization A synchronous signal processor 5 for processing a signal lamp and an audio output unit 6 for outputting the signal processed by the signal processor 3-5 to the speaker SP, the water pipe CRT, and the deflection coil 9, respectively. ) And an image output unit 7 and a deflection output unit 8.

In the above-described multi-television television, 31.9 MHz and 40.4 MHz trap circuits are connected between the tuner 1 and the intermediate frequency circuit section 2 to satisfy the German safety standards.

However, when Eastern Europe uses multi-television television according to the German safety standard to watch multi-television using Secom and British arms, the sound system is affected by the adjacent channel (CH) bandwidth for different reasons. There is a problem in that the sound sensitivity is low to hear the sound generated noise.

For example, a diagram embodying the above description is as follows.

[table]

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to listen to normal sound sound through multi-TV, even when watching Eastern European broadcasting and British broadcasting in a multi-television that satisfies German safety rules. The present invention provides a sound sound compensation circuit of a multi-TV receiver.

The sound compensation circuit of the multi-TV receiver of the present invention for achieving the above object comprises a tuner for picking up a broadcast signal received from an antenna ANT, and processing a booth video signal and an audio signal with a signal input through the tuner. The signal processed by the intermediate frequency circuit unit, the audio signal processor for processing the demodulated audio signal, the video signal processor for processing the video signal, the sync signal processor for processing the horizontal sync and vertical sync signals, and the like. Satisfies the German safety standard by connecting 31.9 MHz and 40.4 MHz trap circuits between the tuner and the intermediate frequency circuit section to a multi-television consisting of an audio output section, a video output section, and a deflection output section. In multi-television, the frequency modulated sound data of the composite video signal picked up through the tuner An intermediate frequency circuit means for outputting, filter means for filtering the sound data output from the intermediate frequency circuit means with a predetermined band pass rental, an integration means for integrating the data output from the filter means, and a control outputted from the integration means Characterized in that the control means for controlling the operation of the trap circuit by the signal.

Hereinafter, the present invention will be described in detail with reference to the illustrated drawings.

2 is a diagram showing a sound sound compensation circuit of a multi-tv receiver according to the present invention.

In the same figure, the tuner 10 and the intermediate frequency circuit means 20 are provided in the multi television set which satisfies the same safety rules.

The intermediate frequency circuit means 20 is configured to supply to the filter means 30 which reproduces the frequency-modulated sound data of the composite video signal picked up through the tuner 10 and retracts it.

The filter means 30 is configured to filter the sound data output from the intermediate frequency circuit means 20 with a 5.5 MHz band pass filter. When the B / G transmission (German broadcast) is received, the filter means 30 is received. Is filtered so that the filtered signal is not present in the filter means 30 when D / K broadcasting (European Europe) and I broadcasting (UK) are received.

The integrating means 40 is supplied to the control means 50 of the trap circuit, which is described later, when the B / G broadcasting (German broadcasting) is filtered by the filter means 30, and the D / K broadcasting (donggu. Upright) and one broadcast (UK) are received so that the low level signal is supplied to the control means 50 of the trap circuit described later because no filtered signal exists.

The control means 50 is configured to conduct the switching elements TR1-TR2 when the high level signal is output from the integrating means 40, and turn off the switching elements TR1-TR2 when the low level signal is output. The first trap circuit T1 and the second trap circuit T2 are set to operate only when the switching elements TR1-TR2 are turned on.

The first trap circuit T1 is set to trap 40.4 MHz, and the second trap circuit T2 is set to trap 31.9 MHz, so that the adjacent channel signal of the sound sound output from the intermediate frequency circuit means 20 is trapped. It is supposed to attenuate.

Referring to the operation of the sound guarantee circuit in the multi-TV receiver of the present invention according to the above configuration as follows.

In FIG. 2, a composite video signal tuned through the tuner 10 is transmitted to the intermediate frequency circuit means 20 and the filter means when a viewer watches a multi-television television that meets the German safety rules. Via (30).

The intermediate frequency circuit means 20 detects the frequency-modulated (5.5 MHz) signal through the 5.5 MHz band pass filter means 30.

At this time, the signal filtered by the filter means 30 is supplied to the integrating means 40 made of RC, and the high level signal is supplied to the base end of the switching elements TR1-TR2 of the control means 50.

Through the switching elements TR1 -TR2 of the control means 50, the disturbance signal of the adjacent channel among the composite image signals picked up through the tuner 10 described above is transmitted to the first trap circuit T1 and the second trap circuit ( T2).

That is, the interference signal of the adjacent channel CH corresponding to 40.4 MHz and 31.9 MHz is generated by the operation of the first and second trap circuits T1 and T2, and the ground terminal of the switching elements TR1-TR2 of the control means 50 is controlled. Bypass each of them will hear the normal sound.

In addition, in the case of watching the B / G broadcast (German broadcast) and then switching to Eastern Europe and the UK broadcast to view the filtered signal in the 5.5MHz band pass filter means 30 does not exist.

Therefore, the low level signal is applied to the integrating means 40 by the switching elements TR1-TR2 of the control means 50.

Accordingly, the switching elements TR1-TR2 of the control means 50 are turned off so that the composite video signal picked up through the tuner 10 does not pass through the first and second trap circuits T1-T2. 20) to listen to the normal sound.

The sound sound compensation circuit of the multi-TV receiver of the present invention operating as described above has the advantage of being able to watch normal broadcasts even when watching multi-TV according to the present invention in Germany, Eastern Europe and the United Kingdom. By overcoming the differences in broadcasting methods, there is an advantage of strengthening the market competitiveness.

In addition, this invention is not limited to the said Example, A deformation | transformation is possible in the range which does not deviate from the technical summary of this invention.

Claims (3)

A tuner 1 for picking up a broadcast signal received from an antenna ANT, an intermediate frequency circuit part 2 for processing a video signal and an audio signal from a signal input through the tuner 1, and the intermediate frequency circuit part 2 Audio signal processor 3 for processing demodulated audio signals, video signal processor 4 for processing video signals, sync signal processor 5 for processing horizontal sync and vertical sync signals, and the signal processor 3- 5) consisting of an audio output section 6, an image output section 7, and a deflection output section 8 for outputting the signal processed by the speaker SP, the water pipe CRT, and the deflection coil 9, respectively. In a multi-TV that satisfies the German safety standard configured by connecting 31.9 MHz and 40.4 MHz trap circuits between the tuner 1 and the intermediate frequency circuit section 2 to a multi-TV, frequency modulation of the composite video signal picked up through the tuner. For playing and outputting sound data The wave circuit means 20, the filter means 30 for filtering the sound data output from the intermediate frequency circuit means 20 to a predetermined band pass band, and the data output from the filter means 30. Sound sound of the multi television receiver, characterized in that the integration means 40 and the control means 50 for controlling the operation of the trap circuit (T1, T2) by the control signal output from the integration means 40 Compensation circuit. The sound sound compensating circuit of claim 1, wherein the sound data output to the intermediate frequency circuit means is filtered by a 5.5 MHz band pass filter. In the case of claim 1, the integrating means 40 outputs a high level signal when the German arm broadcast is filtered by the filter means 30, and a low level signal when the Eastern European and permanent Secom and arm broadcasts are filtered out. Sound sound compensation circuit of the multi-TV receiver, characterized in that configured to output.