KR950011660B1 - Multi system & stereo sound television circuit - Google Patents

Abstract

The circuit comprises a tuner which is to output channel frequency, a frequency processing unit which separates image signals from voice signals and outputs them, a main voice processing unit which is to output audiable stereo voice signals, a voice processing unit which is to supply voice signals to the main voice processing unit in order to compensate the difference of right and left voice signals, and a system controlling unit which outputs frequency control signals to the frequency processing unit.

Description

Multi system and stereo TV receiver circuit

1 is a block diagram of a conventional multi-system receiving circuit.

2 is a block diagram of a conventional stereo receiver circuit.

3 is a configuration diagram of a stereo TV having two conventional carriers.

4 is a characteristic diagram of a filter according to the prior art and the present invention.

5 is a block diagram of a multi-system and stereo TV receiver circuit according to the present invention.

6 is a circuit diagram illustrating another embodiment of the multi-system of FIG.

7 is a block diagram of a stereo reception TV with a multi-system reception function of the present invention.

* Explanation of symbols for main parts of the drawings

1: Tuner part 2: Intermediate frequency processing part

3: detection part 4: carrier trap part

6: first SiF filter 6a: second SiF filter

7: mixer 8a: first oscillator

8b: second oscillator 8c: third oscillator

9: voice detector 10e ~ 10h: frequency discriminator

12: buffer 18: amplifier

19 filter 20 PiF detector

21: intercarrier mixer 22, 28: intermediate frequency processing unit

26: pilot signal detector 29: FM detector

30, 43: system control unit 31: sub-voice control unit

32: main audio processor 33 ~ 35: band pass filter

36: SiF converter 40: main audio processing unit

44: audio output unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to TV receiver circuits and, more particularly, to a multi-system and stereo TV receiver circuit.

1 is a conventional multi-system receiving circuit diagram, in which a tuner unit 1 for tuning and outputting a channel frequency of an input composite video signal, and detecting and outputting a predetermined frequency band from an output signal of the tuner unit 1 is shown. An intermediate frequency processor 2, a detector 3 for detecting the output frequency of the intermediate frequency processor 2, and separating the image into a video signal and an audio signal, and a voice output from the detector 3 First and second SiF filters 6 and 6a for filtering and outputting signals according to a predetermined frequency level, and outputting the signals output from the first SiF filter 6 by oscillator 8 A mixer (7), a switch (SW ₂ ) for inputting the output signals of the mixer (7) and the second SiF filter (6a) at the same time and selectively outputting one signal, a voice detector (9) and a first frequency The switch (S) consists of a discriminator (10) Voice detection unit 11 for detecting and outputting the output signal of W ₂ ) and a predetermined multi-system in switch SW ₂ , voice detection unit 11 and intermediate frequency processing unit ₂ at the time of multi-system reception. The microprocessor unit 5 is configured to apply the multi-system control signal to the carrier trap unit 4 for applying the control signal.

2 is a conventional stereo reception circuit diagram, in which a tuner unit 1 for tuning and outputting a channel frequency of an input composite video signal, a buffer 12, first and second surface acoustic wave filters 13 and 14, and detection are provided. An intermediate frequency processor and detector 16 for detecting a predetermined frequency band from the output signal of the tuner 1 and separating the audio signal into a video signal and outputting the audio signal and the video signal, respectively, and a third SiF filter ( 6b), a voice detector 9 and a frequency discriminator 10a, 10b constitute a voice detector 17 for processing and outputting the voice signal of the detector 15 into an audible stereo voice signal.

3 is a configuration diagram of a stereo TV having two carriers in the related art. The tuner unit 1 tunes and outputs a channel frequency of an input signal, an amplifier 18, a filter 19, a PiF detector 20, and an inter Intermediate frequency processing section 22 which is composed of a carrier mixer 21 to separate the video signal and the audio signal by processing the signal output from the tuner unit 1, and outputs a composite signal of the video signal, video signal and audio signal, respectively ), And a band pass filter (23) (24) for filtering a 5.5 MHz voice carrier and a 5.74 MHz subvoice carrier from the intercarrier mixer (21) of the intermediate frequency processor (22), and a voice detector (9). And a fourth frequency discriminator 10c and a fifth frequency discriminator 10d, and a voice detector 11a for detecting and outputting an input signal from the band pass filters 23 and 24, and a resistor. Pilot signal detector (26) consisting of (R ₁ ), condenser (C ₁ ), coil (L ₁ ), matrix And a voice controller 27 including a tone control unit and a voice signal output unit 25 for receiving a voice frequency of the voice detector 11a and outputting a voice signal.

In the conventional TV receiver circuit as described above, first, in a multi-system circuit as shown in FIG. 1, a predetermined channel frequency of the composite video signal input from the tuner unit 1 is tuned and outputted, and the intermediate frequency processor 2 and detection are performed. Through the section 3, the composite video signal is detected and detected in a predetermined band.

The detector 3 separates the detected composite video signal into an audio signal and a video signal, respectively, and outputs the video signal, which is input to a video signal processor (not shown) and processed. At this time, the video signal output from the detector 3 is input to the first and second SiF filters 6 and 6a according to the interval between the audio signal and the video signal in the composite video signal.

That is, in the composite video signal, the B / G system signal with 5.5 MHz, the I system signal with 6.0 MHz, and the D / K system signal with 6.5 MHz are respectively input to the first SiF filter 6 in the oscillator. Frequency conversion is performed by (8) to output a voice signal via the voice detector (9) at 6 MHz single frequency through the mixer (7) and the switch (SW ₂ ).

Here, in the case of the multi-system (M), the control signal of the microprocessor unit 5 is a frequency band suitable for the multi-system through the intermediate frequency processing unit 2 and the detector (3) through the carrier trap unit (4) The second SiF filter 6a outputs the audio signal of the multi-system through the switch SW2, and at the same time, the microprocessor unit 5 transmits the control signal of the multi-system to the switch SW2 and the first frequency discriminator. Apply simultaneously to (10).

In addition, in the conventional stereo circuit as shown in FIG. 2, the signal processing of the tuner unit 1 and the intermediate frequency processing unit 16 is the same as that of the multi-system TV receiving circuit in the case of a composite video signal, and is output from the detector 15. The audio signal is detected while passing through the third SiF filter 6b and the voice detector 9 to output stereo audio signals R and L.

On the other hand, in a stereo TV having two carriers as shown in FIG. 3, the intermediate frequency output of the tuner 1 is amplified by the amplifier 18, filtered through the surface acoustic wave filter 19, and then, through the PiF detector 20. Outputs a video signal and outputs a mixed signal of the video signal and the audio signal through the intercarrier mixer 21.

Therefore, the mixed signal is filtered through the band pass filters 23 and 24, and the main voice is 5.5 MHz through the fourth frequency discriminator 10c of the voice detector 11a and the fifth frequency discriminator 10d. Through 5.74MHz, which is a negative voice, is discriminated in frequency and output as a voice frequency.

In addition, the voice frequency is adjusted through the matrix of the voice signal output unit 25 and the tone control unit to the sound quality characteristics such as bass, traball, and balance. L), and when there is no 54MHz component in the pilot signal detector 26, it is treated as a mono sound.

However, in the conventional technology, since the multi-system circuit and the stereo circuit are separately configured in the TV receiver circuit, the circuit configuration is complicated and overlaps with each other, which increases production costs and has difficulty in controlling each circuit. .

In particular, the two carrier stereo reception function cannot be received outside the B / G system stereo broadcasting area, and the multi-system reception TV used to cover the world wide area cannot receive the two carrier stereo TV broadcasting. In order to receive the toe carrier stereo broadcast while covering the world wide area, a very complicated circuit configuration is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks and to provide a TV circuit which mainly supports a multi-system reception function and a stereo reception function.

Another object of the present invention is to provide a TV circuit which assists in a stereo reception function and mainly performs a multi-system broadcast reception function.

Hereinafter, an embodiment of the present invention for achieving the above object will be described in detail with reference to the accompanying drawings.

5 is a block diagram of a multi-system and stereo TV receiver circuit according to the present invention, and includes a tuner unit 1, an intermediate frequency processor 2, and detection for tuning and outputting a channel frequency of an input composite video signal. And a frequency processor 28 for inputting the signal output from the tuner unit 1 to detect and detect a predetermined frequency band, separating the video signal and the audio signal, respectively, and outputting the divided signal to the first SiF filter. 6), the mixer 7, the first, the second oscillator (8a, 8b), the switch (SW ₂ ), the voice detector (9) and the frequency discriminator (10e, 10f) consisting of the output of the frequency processor 28 Comprising a main response processing unit 32 for frequency-modulating the main response band signal of the signal as an audible stereo audio signal, a second SiF filter 6a, a pilot signal detector 26, a switch (SW ₃ ) In the audio signal output from the frequency processor 28, the left, When the right stereo audio signal has a difference, the sub audio processor 31 for applying the sub audio signal to the main audio processor 32 to compensate for the difference between the left and right audio signals, the FM detector 29, It consists of a buffer 12, a switch (SW ₁ ) and a carrier trap unit 4 detects the frequency band of the output signal of the frequency processor 28 and corresponds to the multi-system of the frequency processor 28 corresponding to the detected frequency band The system control unit 30 applies a control signal to create a frequency band, and also applies a frequency modulation control signal to the main audio processor 32.

FIG. 6 shows another embodiment of the main audio processor 32 of FIG. 5, wherein the third SiF filter 6b and the fourth SiF filter 6c, which filter the output of the frequency processor 28, and the third SiF filter ( 6b) and a mixer 7 for mixing the output of the third oscillator 8c, a switch SW ₄ for selecting and outputting the output of the mixed mixer 7 and the output of the fourth SiF filter 6c; A voice detector 9 and a frequency discriminator 10g, 10h are provided.

FIG. 7 is a circuit diagram showing still another embodiment of the present invention. A tuner unit 1, an amplifier 18, and a filter for tuning and outputting a channel frequency of a composite video signal input through an antenna ANT are shown in FIG. 19, the PiF detector 20 and the intercarrier mixer 21 are configured to detect and detect an output signal of the tuner 1 in a predetermined frequency band so as to be separated into a video signal and an audio signal and outputted separately. The processor 22, the SiF converter 36, the band pass filter (33-35), the switch (SW ₅ , SW ₆ ), the frequency discriminator (37-39) and the voice detector (9) comprises the frequency processor ( 22, a main audio processor 40, an FM discriminator 41, and an amplifier 42 for detecting and outputting the output signal according to a preset frequency band to return to the original audio signal. 22) to determine the output frequency of the main audio processor 40 according to the frequency band switch It is composed of a system control unit 43, a pilot signal detector 26 and a voice controller 27 for outputting the determination signal, and judges the output signal of the main audio processor 40 to be a voice signal having a left and right difference. Comprising a voice processing control unit 44 for compensating the difference in the voice value and outputs the carrier stereo signal (R, L).

In the present invention as described above, in the case of FIG. 5, the composite video signal input to the TV receiving circuit through the antenna of the TV is tuned to a frequency having a specific channel through the tuner unit 1, and the intermediate frequency of the frequency processing unit 28 is obtained. (2) and the detector (3) in turn is detected and detected in a specific frequency band and separated into a video signal and an audio signal, respectively, and output.

Here, the audio signal is B / G, I, D depending on the interval between the video signal and the audio signal in the composite video signal (5.5MHz: B / G system, 6.0MHz: I system, 6.5MHz: D / K system). The audio signal corresponding to the / K system is detected while passing through the first SiF filter 6 and then input to the mixer 7.

At this time, the audio signal output from the detector 3 detects a selection signal corresponding to the M, B / G, I, D / K system in the FM detector 29, and adjusts SW ₂ according to the received broadcast according to the M method or the like. Optionally according to the B / G, I, D / K system, the M system drives the first generator 8a and the second generator 8b in other systems. The first generator of the main audio processor 32 Frequency conversion is performed in the mixer 7 through 8a) or the second oscillator 8b to output voice signals R and L through the voice detector 9.

Here, the second SiF filter 6a detects stereo components (left and right voice signals) of the output voice signal of the detector 3 and notifies the pilot signal detector 26 of a pilot signal indicating when there is a difference. The switch SW ₃ is turned on to apply a voice signal to the voice detector 9 to output a stereo sound signal with perfect balance.

In addition, when the multi-system is applied, when the input frequency of 4.5 MHz is determined by the FM detector 29, the carrier trap switch SW ₁ is operated through the shock absorber 12, and the intermediate frequency is transmitted through the carrier trap unit 4. The frequency control signal is applied to the processing unit 2 to form a frequency band to which the multi-system is applied, and at the same time, the oscillator selection switch SW ₂ of the main audio processing unit 32 is informed of this and the output of the preset oscillator is provided.

In addition, FIG. 6 is another embodiment of the main audio processor 32. When the stereo voice signal of the B / G, I, and D / K systems is received, it is input to the third SiF filter 6b and then through the third oscillator 8c. The frequency signal is converted and output from the mixer 7, and the voice signal of the multi-system is received by the fourth SiF filter 6c and then switched by the switch SW ₄ through the voice detector 9 through the frequency discriminator 10g ( 10h) is discriminated to the original frequency and output as two carrier stereo audio signals R and L, respectively.

At this time, the switch SW ₄ selects the input of the fourth SiF filter 6c in the M method according to the system, and selects the output of the mixer 7 in the B / G, I, and D / K methods. Stereo audio signals L and R are output through

7 is a view illustrating another embodiment of the present invention in which a composite video signal inputted to a TV receiving circuit through an antenna ANT includes a tuner unit 1, an amplifier 18, a filter 19, and a PiF detector 20. Through the frequency processor 22 composed of the intercarrier mixer 21, the channel is tuned and detected at a frequency having a specific channel and output as a video signal and an audio signal, respectively.

The audio signal output from the frequency processor 22 has a different system as follows according to the interval between the video signal and the audio signal.

(M system: 34.4MHz, B / G system: 33.4MHz, I system: 32.9MHz, D / K system: 32.4MHz)

The audio signals of the M, B / G, I, and D / K systems are mixed with the video intermediate frequency PiF by an intercarrier mixer built in a detector not shown in the figure to change the frequency.

(M System: 4.5MHz, B / G System: 5.5MHz, 5.74MHz, System: 6.0MHz, D / K System: 6.5MHz)

That is, the audio signal output from the frequency processor 22 is input to the band pass filters 34 and 35 and the SiF converter 36, respectively, and the band pass filter 35 passes only the 4.5 MHz frequency band signal, and the band. The pass filter 34 passes only the second voice carrier, a frequency band of 5.74 MHz for B / G, 4.724 MHz for M, and 6.25 MHz for D / K, and B / G, I for SiF converter 36. After converting all frequencies to 6.0 MHz in the D / K system, only the frequency band of 6.0 MHz is output through the band pass filter 33.

At the same time, the FM discriminator 41 of the system controller 43 determines the frequency band of the audio signal output from the frequency processor 22, amplifies it through the amplifier 42, and then switches the two band pass filters at the switch SW ₅ . (35) 33 controls the output of the switching.

In the voice detector 9, the output signal of the switch SW ₅ and the band pass filter 34 is input and detected, and the voice is made into an original voice signal by frequency discriminators 37 to 39 having respective frequency bands. The detection signals AF1 and AF2 are output to the voice processing control unit 44.

In this case, the switch SW ₆ switches the output signals of the sixth and seventh frequency discriminators 37 and 38, and the output signal of the FM discriminator 41 controls them.

Here, the sixth frequency discriminator 37 has a frequency band of 4.5 MHz, the seventh frequency discriminator 38 has a frequency band of 6.0 MHz, and the eighth frequency discriminator 39 has a second voice carrier, that is, (4.724). FM detection of the frequency bands of MHz), B / G (5.74MHz) and D / K (6.25MHz) is performed.

Subsequently, when the left and right signals have the left and right signals, the pilot signal detector 26 determines that the voice detection signals AF1 and AF2 of the voice detector 9 have two-carrier stereo having left and right balance by the voice controller 27. Output signals R and L.

Therefore, according to the present invention, even if an audio signal of an M system and a B / G, I, D / K system or stereo having a natural frequency is input, the circuit according to the present invention can automatically detect it and process the frequency, thereby constructing a circuit. And the manufacturing process is simplified, the cost can be reduced.

Claims (6)

A tuner unit for tuning and outputting a channel frequency of an input composite video signal, a frequency processor for detecting and detecting an output signal of the tuner unit in a predetermined frequency band and separating the video signal and an audio signal and outputting the separated video signal and an audio signal, respectively, The main audio processor for frequency-modulating the output signal of the processing unit into a main audio band signal and outputting it as an audible stereo audio signal, and the left and right stereo audio signals only when the left and right stereo audio signals differ from the output signal of the frequency processing unit. A sub-audio processor for applying a sub-audio signal for compensating for a difference in a voice signal to the main audio processor, and a frequency of an output signal of the frequency processor to determine a frequency of the output signal, and accordingly a switching control signal corresponding to the level value of the frequency; Output frequency output to main audio processing section and fit frequency band for each frequency band A multi-system signal and stereo combine TV receiving circuit, characterized by consisting of a system control section for output to the frequency processing. The method of claim 1, wherein the main audio processor comprises a first SiF filter for detecting an output signal of the frequency processor and a first or second B / G, I, or D / K system signal among the output signals of the first SiF filter. A mixer for outputting a frequency signal corresponding to the B / G, I, and D / K system signals by selective frequency modulation of two oscillators, and a frequency signal output from the mixer to detect an audible original audio signal. And a multi-system and stereo TV receiver circuit comprising a voice detector for outputting two-carrier stereo audio signals. The system of claim 1, wherein the main audio processor comprises: a third SiF filter for receiving voice signals in frequency bands of B / G, I, and D / K systems; and a fourth SiF filter for receiving voice signals in frequency bands of multiple systems; And a voice detector configured to selectively output an output signal of the third SiF filter and an output signal of the fourth SiF filter, which are frequency-modulated through an oscillator, to output a two-carrier stereo audio signal. Receiving circuit. A tuner unit for tuning and outputting a channel frequency of an input composite video signal, a frequency processor for detecting and detecting an output signal of the tuner unit in a predetermined frequency band and separating the output signal into a video signal and an audio signal, and the frequency processor Detects the output signal according to a preset frequency band and returns the original audio signal to the main audio processor, and determines the output frequency of the frequency processor to provide a switching determination signal according to the frequency band to the main audio processor. Multi-system and stereo TV receiver circuit comprising a system control unit for outputting, and a voice processing control unit for judging the output signal of the main audio processing unit to compensate for the difference value of the audio signal having a left and right difference. . 5. The band pass filter of claim 4, wherein the main audio processor receives only a 4.5 MHz and 5.74 MHz frequency band signal, which is an M system signal, and a frequency band corresponding to a B / G, I, D / K system signal. A band pass filter for passing only 6.0 MHz of the output signal of the SiF converter for frequency converting the signal, a switch for switching and outputting one of the outputs of the band pass filter by a control signal of a system controller, and the band pass filter And a voice detector for reproducing and outputting an original audio signal at an output of a switch and an audible audio signal through a detector and a frequency discriminator. 6. The multi-system and stereo TV receiver circuit as claimed in claim 5, wherein the output of the frequency discriminator is controlled by a switch for switching output by a control signal of a system controller.