KR200145943Y1 - Sound demodulation circuit of pal broadcasting system - Google Patents

Sound demodulation circuit of pal broadcasting system Download PDF

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KR200145943Y1
KR200145943Y1 KR2019940004465U KR19940004465U KR200145943Y1 KR 200145943 Y1 KR200145943 Y1 KR 200145943Y1 KR 2019940004465 U KR2019940004465 U KR 2019940004465U KR 19940004465 U KR19940004465 U KR 19940004465U KR 200145943 Y1 KR200145943 Y1 KR 200145943Y1
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South Korea
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intermediate frequency
audio
signal
frequency signal
mixer
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KR2019940004465U
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KR950028940U (en
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서용범
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윤종용
삼성전자주식회사
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/44Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/60Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00Colour television systems
    • H04N11/06Transmission systems characterised by the manner in which the individual colour picture signal components are combined
    • H04N11/12Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only
    • H04N11/14Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system
    • H04N11/16Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system the chrominance signal alternating in phase, e.g. PAL-system
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/44Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/455Demodulation-circuits

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Receiver Circuits (AREA)

Abstract

본 고안은 PAL방송방식의 음성복조회로에 관한 것으로, 중간 주파수 증폭기를 통해 입력되는 중간 주파수 신호는 혼합기에 입력되도록 하고, B/G방식과 I방식 및 D/K방식에 따라 인가 전원을 변화시키면 63.4M와 63.15M 및 62.9M의 주파수신호를 출력하는 VCO에서 선택적으로 출력되는 주파수신호를 혼합기에서 중간 주파수신호와 혼합한 후 음성 중간주파수용 필터를 경유하는 중에 93.4M의 음성중간 주파수가 검출되도록 하며, VCO로 부터 87.9M의 주파수신호를 입력받는 혼합기에서 5.5M의 대역통과필터를 거치고 FM검파기를 경유하여 오디오신호가 출력되도록 함으로써, PAL방송방식의 음성복조회로를 각 방식에 공용화하여 사용할 수 있도록 한 것이다.The present invention relates to a voice demodulation circuit of the PAL broadcasting method, and the intermediate frequency signal input through the intermediate frequency amplifier is input to the mixer, and the applied power is changed according to the B / G method, I method and D / K method. If the VCO outputs 63.4M and 63.15M and 62.9M frequency signals, the intermediate frequency signal of 93.4M is detected while mixing the intermediate signal with the intermediate frequency signal in the mixer. In the mixer that receives the 87.9M frequency signal from the VCO, it passes the 5.5M bandpass filter and outputs the audio signal through the FM detector. It is intended to be used.

Description

PAL방송방식의 음성복조회로PAL Broadcasting Voice Demodulation Circuit

제1도는 종래의 스플리트 캐리어 방식의 음성복조회로도.1 is a voice demodulation circuit diagram of a conventional split carrier method.

제2도는 본 고안의 회로도.2 is a circuit diagram of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

21 : 튜너 22, 29 : 증폭기21: tuner 22, 29: amplifier

23, 26 : 혼합기 24, 27 : VCO23, 26: Mixer 24, 27: VCO

25 : 음성중간 주파수용 필터 28 : 대역통과필터25: filter for voice intermediate frequency 28: band pass filter

30 : FM검파기30: FM detector

본 고안은 PAL방송방식의 음성복조회로에 관한 것으로, 영상캐리어와 음성캐리어의 차이로 인해 구분되는 방식(B/G, I, D/K)에 공용으로 사용할 수 있도록 한 PAL방송방식의 음성복조회로에 관한 것이다.The present invention relates to a voice demodulation circuit of the PAL broadcasting method, and the voice of the PAL broadcasting system that can be used in common for the method (B / G, I, D / K) that is distinguished due to the difference between the image carrier and the voice carrier. It relates to a demodulation circuit.

일반적으로 PAL(Phase Alternation by Line)방송방식이라 하면 서독, 오스트리아, 영국 등의 유럽지역에서 표준방식으로 채택하고 있는 것으로서 전송특성이 우수하여 약전에서도 NTSC 방식에 비해 SN비가 좋으며 위상의 왜곡을 받지 않는 장점이 있는 칼라 텔레비젼 방송방식임은 이미 잘 알려진 것이다.In general, PAL (Phase Alternation by Line) broadcasting system is adopted as standard method in Europe such as West Germany, Austria, UK, etc., and has excellent transmission characteristics. It is well known that color television broadcasting has its advantages.

그리고 PAL방송방식에서 영상신호의 영상 중간 주파수(PIF)를 38.9MHz라 할 때 음성 중간 주파수(SIF)가 각각 33.4MHz, 32.9MHz 및 32.4MHz의 값을 갖도록 함에 따라 B/G방식, I방식 및 D/K방식으로 구분하였다.In the PAL broadcasting method, when the video intermediate frequency (PIF) of the video signal is 38.9MHz, the audio intermediate frequency (SIF) has values of 33.4MHz, 32.9MHz, and 32.4MHz, respectively. It was divided by D / K method.

그러므로 PAL방송방식에서는 B/G방식, I방식 및 D/K방식에 따라 음성처리부가 다르게 설계 되어야 하였다.Therefore, in the PAL broadcasting method, the voice processing unit should be designed differently according to the B / G method, I method and D / K method.

종래에는 제1도에 도시한 것과 같이 안테나(Ant)(1)를 통해 입력되는 텔레비젼 방송신호는 튜너(2)를 경유하는 중에 사용자가 선택한 방송채널의 신호만 출력되도록 하고, 상기 튜너(2)로 부터의 중간 주파수 신호는 증폭기(3)에서 충분히 증폭된 후, 영상 중간 주파수용 필터(4)를 통하여는 38.9MHz대역의 영상 중간 주파수만 통과시켜 다음의 영상 신호 처리계로 전달하면서 음성 중간 주파수용 필터(5)를 통하여는 음성 중간 주파수 신호만 통과시켜 혼합기(6)로 전달한다.Conventionally, as shown in FIG. 1, a television broadcast signal input through an antenna (1) outputs only a signal of a broadcast channel selected by a user while passing through a tuner (2), and the tuner (2). After the intermediate frequency signal from the amplifier is sufficiently amplified by the amplifier 3, the image intermediate frequency filter 4 passes only the image intermediate frequency in the 38.9 MHz band and passes it to the next image signal processing system for the audio intermediate frequency. The filter 5 passes only the voice intermediate frequency signal to the mixer 6.

VCO(Voltage Controlled Oscillator)(7)로 부터의 VCO주파수도 공급되는 상기의 혼합기(6)에서는 음성 중간 주파수 신호와 VCO주파수를 혼합하면서 각 방식별의 주파수 신호를 생성한다.The mixer 6, which is also supplied with a VCO frequency from a voltage controlled oscillator (VCO) 7, generates a frequency signal for each system while mixing a voice intermediate frequency signal and a VCO frequency.

즉, B/G방식은 영상중간 주파수 38.9M-음성중간 주파수 33.4=5.5M, I방식은 영상중간 주파수 38.9M-음성중간 주파수 32.96=6.0M, D/K방식은 영상중간 주파수 38.9M-음성중가 주파수 32.4=6.5M로 한다.In other words, B / G mode is 38.9M-audio middle frequency 33.4 = 5.5M, I mode is 38.9M-audio middle frequency 32.96 = 6.0M, and D / K mode is 38.9M-audio The intermediate frequency is 32.4 = 6.5M.

상기의 혼합기(6)로 부터의 5.5M, 6.0M 및/또는 6.5M의 주파수신호는 각각의 방식에 따른 대역통과필터(BPF)(8)를 경유하여야 하므로 각 방식에 따라 5.5M BPF, 6.0M BPF 및/또는 6.5M BPF를 사용하여야 하며, 대역통과필터(8)를 경유하는 중에 방식에 따른 대역의 주파수신호만 통과되도록 한 후 증폭기(9)에서 얼마간 증폭되어 FM검파기(10)로 출력되도록함으로써 방식에 따른 5.5M, 6.0M, 6.5M의 FM주파수변별기(11)에 의한 주파수로 겸파되어 오디오신호(Audio)로 출력되도록 하였다.The 5.5M, 6.0M and / or 6.5M frequency signals from the mixer 6 must pass through the band pass filter (BPF) 8 according to the respective methods. M BPF and / or 6.5M BPF should be used, and only the frequency signal of the band according to the method is passed while passing through the band pass filter 8 and then amplified for some time by the amplifier 9 and output to the FM detector 10. By doing so, the frequency of the frequency by the 5.5M, 6.0M, 6.5M FM frequency discriminator 11 according to the method to be output as an audio signal (Audio).

그러나 상기와 같은 종래의 음성복조회로에 의하여서는 음성중간 주파수용 필터(5)는 B/G, I, D/K의 방식에 따라 33.4M, 32.9M 및 32.4M의 3가지가 필요하고, 대역통과필터(8)와 주파수 변결비(11)는 B/G, I, D/K의 방식에 따라 5.5M, 6.OM, 및 6.5M의 3가지가 필요하므로 각각 다르게 구성하여야 하였고, 이에 따라 단순, 소형화 및 복합, 일체화로 되는 현 추세에서는 생산원가의 상승과 생산과정 및 관리가 복잡해지게 되는 등의 단점이 있었다.However, according to the conventional voice demodulation circuit as described above, the voice intermediate frequency filter 5 requires three types of 33.4M, 32.9M, and 32.4M according to B / G, I, and D / K. Since the band pass filter 8 and the frequency change ratio 11 need three types of 5.5M, 6.OM, and 6.5M according to the B / G, I, and D / K methods, they have to be configured differently. Therefore, in the current trend of simple, miniaturized, complex, and integrated, there are disadvantages such as an increase in production cost and complicated production process and management.

이에 따라 본 고안은 하나의 회로로서 B/G, I, D/K의 방식을 공용화 하도록 하여 멀티 수신기에서 성능의 향상과 부품수의 감소효과를 얻도록 한 PAL방송방식의 음성복조회로를 제공하는 것을 그 목적으로 한다.Accordingly, the present invention provides a PAL broadcasting demodulation circuit that allows the B / G, I, and D / K methods to be shared as one circuit, thereby improving performance and reducing the number of parts in a multi-receiver. It is for that purpose.

이와같은 목적을 달성하기 위한 본 고안은 중간 주파수 증폭기를 통해 입력되는 중간 주파수 신호는 혼합기에 입력되도록 하고, B/G방식과 I방식 및 D/K방식에 따라 인가 전원을 변화시키면 63.4M와 63.15M 및 62.9M의 주파수신호를 출력하는 VCO에서 선택적으로 출력되는 주파수신호를 혼합기에서 중간 주파수신호와 혼합한 후 음성 중간주파수용 필터를 경유하는 중에 93.4M의 음성중간 주파수가 검출되도록 하며,VCO로 부터 87.9M의 주파수신호를 입력받는 혼합기에서 5.5M의 대역통과필터를 거치고 FM검파기를 경유하여 오디오신호가 출력되도록 함으로써, PAL방송방식의 음성복조회로를 각 방식에 공용화하여 사용할 수 있도록 한 것이다.In order to achieve the above object, the present invention allows the intermediate frequency signal input through the intermediate frequency amplifier to be input to the mixer, and changes the applied power according to the B / G method, the I method, and the D / K method. After mixing the frequency signal selectively output from the VCO outputting M and 62.9M frequency signals with the intermediate frequency signal in the mixer, the voice intermediate frequency of 93.4M is detected while passing through the filter for voice intermediate frequency. PAL broadcast type voice demodulation circuit can be used for each system by passing the 5.5M band pass filter in the mixer that receives 87.9M frequency signal from the mixer and outputting the audio signal through the FM detector. .

이하 본 고안을 첨부 도면에 의거 상세히 기술하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

안테나(20)를 통해 입력되는 텔레비젼 방송신호는 튜너(21)를 경유하는 중에 사용자가 선택한 방송채널의 신호만 출력되도록 하고, 상기 튜너(21)로 부터의 중간 주파수신호는 증폭기(22)에서 충분히 증폭된 후 제 1 혼합기(23)로 공급되도록 하며, PAL방식과 B/G방식과 I방식 및 D/K방식의 종류에 따라 발진용 제어전압이 각각 V1, V2, V3으로 입력되는 제 1 VCO(24)에서는 63.4M, 63.15M 및 62.9M의주파수신호를 출력하여 상기의 제 1 혼합기(23)에서 혼합되어 86.9M와 93.4M의 중간 주파수 신호로 출력되도록 하고, 상기의 제 1 혼합기(23)로 부터의 영상중간 주파수신호(86.9M)와 음성중간 주파수신호(93.4M)가 음성중간 주파수용 필터(25)를 경유하는 중에 음성중간 주파수신호만 통과하여 제 2 혼합기(26)로 출력하며, 87.9M의 주파수신호를 출력하는 제 2 VCO(27)과 연결된 제 2 혼합기(26)에서는 5.5M의 대역통과필터(28)를 거치고 증폭기(29)를 경유한 후 FM검파기(30)를 통해 오디오신호(Audio)로 출력되도록 한 것이다.The television broadcast signal input through the antenna 20 outputs only the signal of the broadcast channel selected by the user while passing through the tuner 21, and the intermediate frequency signal from the tuner 21 is sufficiently supplied by the amplifier 22. After the amplification is supplied to the first mixer 23, the first VCO input oscillation control voltage to V1, V2, V3 according to the PAL, B / G, I and D / K type At 24, 63.4M, 63.15M, and 62.9M frequency signals are output and mixed in the first mixer 23 to be output as intermediate signals of 86.9M and 93.4M, and the first mixer 23 described above. The video intermediate frequency signal (86.9M) and the audio intermediate frequency signal (93.4M) from the PDP pass through the audio intermediate frequency filter 25 and output only the audio intermediate frequency signal to the second mixer 26. , A second mixer 26 connected to a second VCO 27 that outputs a frequency signal of 87.9M. ) Is passed through the band-pass filter 28 of 5.5M via the amplifier 29 and then output to the audio signal (Audio) through the FM detector (30).

이와같이 구성한 본 고안의 PAL방송방식의 음성복조회로는 안테나(20)를 통해 입력되는 텔레비젼 방송신호가 PAL방송방식에 의한 방송신호이면 튜너(21)에 의해 선국되고 증폭기(22)에서 충분히 증폭되도록 한 후 제 1 혼합기(23)로 입력되도록 한다.The PAL broadcast demodulation circuit of the present invention configured as described above is tuned by the tuner 21 and sufficiently amplified by the amplifier 22 when the television broadcast signal input through the antenna 20 is a broadcast signal according to the PAL broadcast method. After input to the first mixer (23).

여기서 PAL방송방식 중에서 B/G방식인 경우에는 제 1 VCO(24)로 인가되는 발진용 제어전압이 B/G전압(V1)이 인가되도록 하면 음성중간 주파수의 33.4M + 30M인 주파수신호와 93.4M의 음성중간 주파수신호로 만들어 진다.In the case of the B / G system among the PAL broadcasting methods, when the oscillation control voltage applied to the first VCO 24 is applied to the B / G voltage V1, a frequency signal of 33.4M + 30M of the voice intermediate frequency and 93.4 It is made of M voice middle frequency signal.

이 영상 및 음성중간 주파수신호는 음성중간 주파수용 필터(25)를 경유하는 중에 93.4M의 음성중간 주파수신호만 통과하여 제 2 혼합기(26)에서 제 2 VCO로 부터의 87.9M와 혼합되면서 5.5M로 변환된다.This video and audio intermediate frequency signal passes through only the audio intermediate frequency signal of 93.4M while passing through the audio intermediate frequency filter 25, and is mixed with 87.9M from the second VCO in the second mixer 26 to 5.5M. Is converted to.

이 5.5M의 음성주파수는 증폭기(29)에서 얼마간 증폭되고 FM검파기(30)를 통해 오디오신호(Audio)로 출력된다.This 5.5M voice frequency is amplified by the amplifier 29 for some time and output as an audio signal (Audio) through the FM detector 30.

그리고, PAL방송방식 중에서 I방식인 경우에는 제 1 VCO(24)로 I용 전압(2)이 발진용 제어전압으로 인가되고 이에 따라 음성중간 주파수인 32.9M + 30.25M인 63.15M의 주파수신호가 제 1 VCO(24)에서 제 1 혼합기(23)로 출력되어 중간주파수 신호와 혼합되어 87.4M의 영상중간 주파수와 93.4M의 음성중간 주파수로 만들어 진다.In the case of the I method in the PAL broadcasting method, the I voltage 2 is applied to the first VCO 24 as the oscillation control voltage. Accordingly, a frequency signal of 63.15M, which is a voice intermediate frequency of 32.9M + 30.25M, is applied. It is output from the first VCO 24 to the first mixer 23 and mixed with the intermediate frequency signal to produce an image intermediate frequency of 87.4M and an audio intermediate frequency of 93.4M.

이 영상 및 음성중간 주파수신호는 음성중간 주파수용 필터(28)를 경유하는 중에 93.4M의 음성중간 주파수만 통과한 후 전술한 것과 동일한 과정으로 오디오신호(Audio)로 출력된다.This video and audio intermediate frequency signal passes through only the audio intermediate frequency of 93.4M while passing through the audio intermediate frequency filter 28, and is then output as an audio signal in the same process as described above.

한편 PAL방송방식 중에서 D/K방식인 경우에는 제 1 VCO(24)로 D/K용 전압(V3)이 발진용 제어전압으로 인가되도록 하여 음성중간 주파수인 32.9M + 30.5M인 62.9M의 주파수신호가 제 1 혼합기(23)에서 중간주파수신호와 혼합되도록 하고, 이에따라 86.9M의 영상중간 주파수신호와 93.4M의 음성중간 주파수신호가 만들어져 음성중간 주파수용 필터(25)를 경유하는 중에 93.4M의 음성중간 주파수만 통과한 후 전술한 것과 동일한 고정을 거쳐 오디오신호(Audio)가 출력되도록 한 것이다.On the other hand, in the case of the D / K method of the PAL broadcasting method, the D / K voltage V3 is applied as the oscillation control voltage to the first VCO 24 so that the frequency of voice is 62.9M, which is 32.9M + 30.5M. The signal is mixed with the intermediate frequency signal in the first mixer 23, and accordingly, a video intermediate frequency signal of 86.9M and a voice intermediate frequency signal of 93.4M are generated to pass a signal of 93.4M while passing through the filter for voice frequency 25. After passing only the intermediate frequency, the audio signal is output through the same fixation as described above.

따라서 본 고안의 PAL방송방식의 음성복조회로에 의하여서는 중간 주파수신호가 입력되는 제 1 혼합기로 제 1 VCO로 부터의 주파수신호가 입력되도록 하되 발진용 제어전압이 B/G방식, I방식 및 D/K방식에 따라 V1, V2, V3로 각각 인가되도록 하면서 63.4M, 63.15M 및 62.9M의 주파수신호가 입력되도록 하여 음성중간 주파수신호가 93.4M로 공용화한 후 5.5M의 오디오신호(Audio)를 출력하도록 함으로써 생산원가의 절감과 생산성의 향상은 물론, 설계의 용이성과 단순화를 꾀한 멀티 수신기에 유용한 것이다.Therefore, in the PAL broadcasting type voice demodulation circuit of the present invention, the frequency signal from the first VCO is input to the first mixer into which the intermediate frequency signal is input. According to D / K method, 63.4M, 63.15M, and 62.9M frequency signals are inputted while being applied to V1, V2, and V3, respectively, and the middle frequency signal is shared to 93.4M, followed by 5.5M audio. It is useful for multi-receiver that aims to reduce production cost and improve productivity, as well as ease of design and simplification.

Claims (1)

PAL방송방식 중 B/G방식, I방식 및 D/K방식의 종류에 따라 발진용 제어전압을 V1, V2, V3로 입력받아 각각 63.4M, 63.15M, 63.9M의 주파수신호를 출력하는 제 1 VCO(24)와, 튜너(21) 및 증폭기(22)를 경유한 중간 주파수신호를 입력받으면서 상기의 제 1 VCO(24)로 부터의 주파수신호를 혼합하여 86.9M의 영상중간 주파수신호와 93.4M의 음성중간 주파수신호를 출력하는 제 1 혼합기(23)와, 상기의 제 1 혼합기(23)로 부터의 영상 및 음성주파수를 입력받아 93.4M의 음성중간 주파수신호만 출력하는 음성중간 주파수용필터(25)들로 구성하여 5.5M의 오디오신호를 출력하도록 한 PAL방송방식의 음성복조회로.The first to output the frequency signals of 63.4M, 63.15M, and 63.9M, respectively, by receiving the oscillation control voltages of V1, V2, and V3 according to the B / G, I, and D / K methods among the PAL broadcasting methods. While receiving the intermediate frequency signal via the VCO 24, the tuner 21, and the amplifier 22, the frequency signals from the first VCO 24 are mixed, and the image intermediate frequency signal of 96.9M and 93.4M are mixed. A first intermediate mixer 23 for outputting an audio intermediate frequency signal of an audio medium, and an audio intermediate frequency filter for outputting only an audio intermediate frequency signal of 93.4 M by receiving an image and an audio frequency from the first mixer 23 ( 25) PAL broadcasting type demodulation circuit configured to output 5.5M audio signal.
KR2019940004465U 1994-03-08 1994-03-08 Sound demodulation circuit of pal broadcasting system KR200145943Y1 (en)

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KR200145943Y1 true KR200145943Y1 (en) 1999-06-15

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