KR930001326Y1 - Audio signal demodulation auto-control circuit of multi-system vtr - Google Patents
Audio signal demodulation auto-control circuit of multi-system vtr Download PDFInfo
- Publication number
- KR930001326Y1 KR930001326Y1 KR2019880009705U KR880009705U KR930001326Y1 KR 930001326 Y1 KR930001326 Y1 KR 930001326Y1 KR 2019880009705 U KR2019880009705 U KR 2019880009705U KR 880009705 U KR880009705 U KR 880009705U KR 930001326 Y1 KR930001326 Y1 KR 930001326Y1
- Authority
- KR
- South Korea
- Prior art keywords
- intermediate frequency
- signal
- pal
- output
- voice
- Prior art date
Links
- 230000005236 sound signal Effects 0.000 title description 3
- 238000001514 detection method Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 description 11
- 239000003990 capacitor Substances 0.000 description 10
- 230000003321 amplification Effects 0.000 description 5
- 239000013256 coordination polymer Substances 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 230000009977 dual effect Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N11/00—Colour television systems
- H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
- H04N11/12—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only
- H04N11/14—Transmission 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
- H04N11/16—Transmission 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
- H04N11/167—Transmission 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 a resolution-increasing signal being multiplexed to the PAL-system signal, e.g. PAL-PLUS-system
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
내용 없음.No content.
Description
제1도는 본 고안 실시 회로도.1 is a circuit diagram of the subject innovation.
제2도는 PAL 각 방식의 캐리어 주파수 특성도.2 is a carrier frequency characteristic diagram of each PAL scheme.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 음성중간주파 검출부 2 : 증폭부1: voice intermediate frequency detection unit 2: amplification unit
3 : 검파부 4 : 비교부3: detection unit 4: comparison unit
R1-R2: 저항 C1-C4: 콘덴서R 1 -R 2 : Resistor C 1 -C 4 : Capacitor
Q1-Q2: 트랜지스터 CP : 비교기Q 1 -Q 2 : Transistor CP: Comparator
L1: 코일 SF1, SF2: 필터L 1 : Coil SF 1 , SF 2 : Filter
본 고안은 멀티시스템 브이티알 특히, PAL B/G와 PAL D/K 또는 PAL D/K와 PAL-I 등의 PAL방식의 듀얼시스템 브이티알에 있어서, 입력되는 PAL방송방식에 따라 음성신호가 PAL의 각 방식에 해당되는 주파수를 갖는 FM신호로 자동 변환되도록 한 멀티시스템 브이티알의 음성 변조 자동제어회로에 관한 것이다.The present invention is a multi-system VTI, particularly PAL B / G and PAL D / K, or PAL dual system VT, such as PAL D / K and PAL-I, the voice signal is PAL according to the input PAL broadcast system The present invention relates to an automatic modulation system for voice modulation of multi-system VTI that is automatically converted into an FM signal having a frequency corresponding to each of the methods.
종래에는 음성신호를 PAL의 각 방식에 따른 FM신호로 변환하는 RF변환기에 수동 스위치를 부착하여 사용하는 방송방식에 따라 수동으로 스위치를 조작하여 음성신호를 사용방송방식에 맞는 주파수를 가지는 FM신호로 변환시키도록 되어 있어, 사용되는 방송방식에 따라 RF변환기의 FM주파수를 수동으로 선택하여야 하는 불편함이 있었다.Conventionally, a manual switch is attached to an RF converter that converts a voice signal into an FM signal according to each PAL method. In order to convert, there was an inconvenience of manually selecting the FM frequency of the RF converter according to the broadcasting method used.
본 고안은 이와 같은 불편함을 해결하기 위해 입력된 중간주파 신호에서 음성 중간주파신호를 검출하고, 검출된 음성 중간주파 신호를 증폭 및 검파하여 검파된 신호의 전압레벨에 의해 PAL B/G신호인지 PAL D/K신호인지를 판별하며, 이 판별된 신호에 의해 RF변환기의 변환 FM주파수를 선택하도록 고안된 것으로서, 이하 본 고안의 구성 및 작용효과를 첨부도면에 의해 상세히 설명하면 다음과 같다.In order to solve this inconvenience, the present invention detects the voice intermediate frequency signal from the input intermediate frequency signal, and amplifies and detects the detected voice intermediate frequency signal to determine whether it is a PAL B / G signal by the voltage level of the detected signal. It is designed to determine whether the signal is a PAL D / K signal, and to select the converted FM frequency of the RF converter based on the determined signal. Hereinafter, the configuration and operation of the present invention will be described in detail with reference to the accompanying drawings.
입력된 중간주파신호(IS)가 음성 중간주파 검출부(1)에 인가되고, 이 음성 중간주파 검출부(1)에서 검출된 음성 중간주파 신호가 증폭부(2)에 인가되며, 이 증폭부(2)에서 증폭되고 일정 주파수로 공진된 출력신호가 검파부(3)에 인가되고, 이 검파부(3)에서 검파된 직류전압이 비교부(4)에 인가되며, 이 비교부(4)의 출력이 RF변환기의 제어 입력단자(CT)에 인가되게 구성한다.The input intermediate frequency signal IS is applied to the speech intermediate frequency detection unit 1, and the speech intermediate frequency signal detected by the speech intermediate frequency detection unit 1 is applied to the amplifier 2, and this amplifier 2 The output signal amplified by the signal and resonated at a constant frequency is applied to the detector 3, and the DC voltage detected by the detector 3 is applied to the comparator 4, and the output of the comparator 4 is It is configured to be applied to the control input terminal CT of this RF converter.
상기 구성에서, 증폭부(2)가 음성 중간주파 검출부(1)에서 출력되는 음성 중간주파 신호가 입력되어 커플링 콘덴서(C1) 및 바이어스 저항(R4)(R5)을 통해 증폭용 트랜지스터(Q1)의 베이스에 인가되고, 이 트랜지스터(Q1)의 콜렉터 출력이 저항(R6), 코일(L1) 및 콘덴서(C2)로 된 공진회로를 통해 검파부(3)에 인가되게 연결하여 구성한다.In the above configuration, the amplification unit 2 receives the audio intermediate frequency signal output from the voice intermediate frequency detection unit 1 and amplifies the transistor through the coupling capacitor C 1 and the bias resistor R 4 R 5 . is applied to the base of (Q 1), applied to the transistor (Q 1), the collector output resistor (R 6), the coil (L 1) and the detector (3) through to the resonant circuit capacitor (C 2) Connect and configure.
이와 같이 구성되는 본 고안에 있어서, PAL방식의 방송별 차이점은 제2도와 같이 영상 캐리어와 음성캐리어간의 주파수 간격이 서로 다르다는 점이다. 즉, 영상캐리어와 음성캐리어와의 주파수 간격이 PAL B/G 5.8MHZ, PAL D/K방식은 6.5MHZ, PAL-I방식은 6.0MHZ가 각각 된다.In the present invention configured as described above, the difference between broadcasts of the PAL method is that frequency intervals between the video carrier and the voice carrier are different from each other as shown in FIG. That is, the frequency interval between the video carrier and the audio carrier is PAL B / G 5.8MHZ, PAL D / K method is 6.5MHZ, PAL-I method is 6.0MHZ, respectively.
따라서, PAL방식 듀얼시스템에서는 PAL B/G방식과 PAL D/K방식을 사용하거나 또는 PAL D/K방식과 PAL-I방식을 하나의 듀얼시스템으로 사용할 수가 있는데, 본 고안의 실시예에서는 PAL B/G방식과 PAL D/K방식을 사용하는 듀얼시스템에 대해 설명하기로 한다.Accordingly, in the PAL dual system, PAL B / G and PAL D / K or PAL D / K and PAL-I can be used as one dual system. A dual system using the / G method and the PAL D / K method will be described.
제1도의 본 고안의 실시예에 있어서, 중간주파신호(IS)가 입력되어 음성 중간주파 검출부(1)에 인가되는데, 이때 입력되는 중간주파신호(IS)가 PAL B/G방식일 경우에는 5.5MHA 필터(SF1)을 통하여 음성 중간주파신호가 출력되고, PAL D/K방식일 경우에는 6.5MHA 필터(SF2)를 통해 음성 중간주파 신호가 출력되어 증폭부(2)내의 커플링 콘덴서(C1) 및 바이어스 저항(R4)(R5)을 통해 증폭용 트랜지스터(Q1)의 베이스에 인가된다. 먼저, 음성 중간주파 검출부(1)에서 출력되는 음성 중간주파 신호가 PAL B/G방식일 경우 음성 중간주파 검출부(1)의 출력인 5.5MHA의 음성 중간주파 신호가증폭부(2)내의 증폭용 트랜지스터(Q1)의 베이스에 인가되어 이 증폭용 트랜지스터(Q1)에서 증폭되는데, 이때 코일(L1), 콘덴서(C2) 및 저항(R6)으로 된 공진회로가 5.5MHZ로 설정되어 있어 트랜지스터(Q1)에서 증폭된 5.5MHZ 음성 중간주파 신호가 증폭부(1)에서 출력되어 검파부(3)에 인가된다.In the embodiment of the present invention of FIG. 1, the intermediate frequency signal IS is input to the speech intermediate frequency detection unit 1, where 5.5 is input when the intermediate frequency signal IS is a PAL B / G system. The negative intermediate frequency signal is output through the MHA filter SF 1 , and in the case of the PAL D / K method, the negative intermediate frequency signal is output through the 6.5 MHA filter SF 2 , and the coupling capacitor ( C 1 ) and bias resistor R 4 (R 5 ) are applied to the base of the amplifying transistor Q 1 . First, when the voice intermediate frequency signal output from the voice intermediate frequency detection unit 1 is a PAL B / G system, the 5.5 MHA voice intermediate frequency signal, which is output from the voice intermediate frequency detection unit 1, is used for amplification in the amplification unit 2. there is applied to the base of the transistor (Q 1) amplified in the amplifying transistor (Q 1) for, wherein the coil (L 1), a capacitor (C 2) and the resistance of the resonant circuit in (R 6) is set to 5.5MHZ The 5.5 MHZ negative intermediate frequency signal amplified by the transistor Q 1 is output from the amplifier 1 and applied to the detector 3.
검파부(3) 내의 검파용 트랜지스터(Q2)를 통한 증폭된 음성 중간주파 신호는 저항(R9)(R10) 및 콘덴서(C4)에의해 검파되어 직류전압으로 변환되고, 변환된 직류전압이 검파부(3)에서 출력되어 비교부(4)내의 비교기(CP)의 비반전 입력단자(+)에 인가되는데, 이때 반전입력단자(-)에는 증폭된 음성 중간주파 신호를 검파한 직류전압보다는 낮도록 저항(R11)(R12)에 의해 설정된 기준전압이 인가되어 있으므로 이 비교기(CP)의 출력은 "하이"레벨 전압이 출력된다. 비교부(4)에서 출력되는 "하이"레벨 전압이 통상의 RF변환기(RC)의 제어입력단자(CT)에 인가되면, 이 RF변환기(RC)내의 인버어터(Q3-Q5)에서 각각 반전되어 코일(L2), 콘덴서(C5) 및 저항(R13)으로 된 5.5MHA 발진기에서는 "하이"레벨 전압이 인가되어 5.5MHZ의 주파수로 변조신호를 발진시키고, 코일(L3), 콘덴서(C6) 및 저항(R4)으로 된 6.5MHZ 발진기에는 "로우"레벨 전압이 인가되어 발진기가 작동되지 않게 됨에 따라 5.5MHZ 발진기에서 발진된 변조신호가 FM변조기(FR)에 인가되어 음성입력단자(AI)에 인가된 음성신호를 PAL B/G방식인 5.5MHZ FM신호로 변환시켜 음성출력단자(AO)를 통해 텔레비젼으로 출력시킨다.The amplified voice intermediate frequency signal through the detection transistor Q 2 in the detector 3 is detected by a resistor R 9 , R 10 and a condenser C 4 , converted into a DC voltage, and converted into a DC voltage. The voltage is output from the detector 3 and applied to the non-inverting input terminal (+) of the comparator CP in the comparator 4, where the inverted input terminal (-) detects the amplified voice intermediate frequency signal. Since the reference voltage set by the resistors R 11 and R 12 is applied to be lower than the voltage, the output of this comparator CP outputs a "high" level voltage. When the "high" level voltage output from the comparator 4 is applied to the control input terminal CT of the conventional RF converter RC, each of the inverters Q 3 -Q 5 in the RF converter RC is applied. is inverted coil (L 2), a capacitor (C 5) and a resistor (R 13) in the 5.5MHA the oscillator is applied to the "high" level voltage and a modulation signal oscillating at a frequency of 5.5MHZ, the coil (L 3), The 6.5MHZ oscillator with the capacitor (C 6 ) and the resistor (R 4 ) is supplied with a "low" level voltage and the oscillator becomes inoperative, so that the modulated signal oscillated from the 5.5MHZ oscillator is applied to the FM modulator (FR). The audio signal applied to the input terminal AI is converted into a 5.5 MHZ FM signal, which is a PAL B / G system, and output to a television through the audio output terminal AO.
또한, 음성 중간주파 검출부(1)에서 출력되는 음성 중간주파 신호가 PAL D/K방식일 경우에는 음성 중간주파 검출부(1)의 출력인 6.5MHZ의 음성 중간주파 신호가 증폭부(2)내의 커플링 콘덴서(C1) 및 바이어스 저항(R4)(R5)을 통해 증폭용 트랜지스터(Q1)의 베이스에 인가되는데, 이때 코일(L1), 콘덴서(C2) 및 저항(R6)으로된 공진회로가 5.5MHZ로 설정되어 있기 때문에 증폭용 트랜지스터(Q1)의 베이스에 인가된 6.5MHZ의 음성 중간주파신호가 증폭되지 않게 되고, 이에 따라 증폭부(2)에서 출력되는 신호가 없어 검파부(3)내의 검파용 트랜지스터(Q2)의 베이스전압이 "로우"레벨로 됨으로써 이 트랜지스터(Q2)가 "오프"되어 검파부(3)의 출력전압도 "로우"레벨이 된다.In addition, when the voice intermediate frequency signal output from the voice intermediate frequency detection unit 1 is the PAL D / K method, the 6.5 MHZ voice intermediate frequency signal, which is output from the voice intermediate frequency detection unit 1, is coupled to the amplification unit 2. It is applied to the base of the amplifying transistor Q 1 through a ring capacitor C 1 and a bias resistor R 4 (R 5 ), wherein the coil L 1 , the capacitor C 2 , and the resistor R 6 . Since the resonant circuit is set to 5.5MHZ, the 6.5MHZ voice intermediate frequency signal applied to the base of the amplifying transistor Q 1 is not amplified, so that no signal is output from the amplifying unit 2. When the base voltage of the detection transistor Q 2 in the detector 3 is set to the "low" level, the transistor Q 2 is "off", and the output voltage of the detector 3 is also set to the "low" level.
검파부(3)에서 출력되는 "로우"레벨 전압이 반전입력단자(-)에 일정한 기준전압이 인가되는 비교부(4)내의 비교기(CP)의 비반전입력단자(+)에 인가됨에 따라 이 비교기(CP)에서는 "로우"레벨 전압이 출력되어 통상의 변환기(RC)의 제어신호 입력단자(CT)에 인가된다.As the " low " level voltage output from the detector 3 is applied to the non-inverting input terminal + of the comparator CP in the comparator 4 where a constant reference voltage is applied to the inverting input terminal-, In the comparator CP, a "low" level voltage is output and applied to the control signal input terminal CT of the normal converter RC.
RF변환기(RC)의 제어신호 입력단자(CT)에 인가된 "로우"레벨전압은 RF변환기(RC)내의 인버어터(Q3-Q5)에 의해 각각 반전되어 코일(L2), 콘덴서(C5) 및 저항(R13)으로 된 5.5MHZ 발진기에는 "로우"레벨 전압이 인가되고, 코일(L3). 콘덴서(C5) 및 저항(R14)으로 된 6.5MHZ 발진기에는 "하이"레벨 전압이 각각 인가됨에따라 6.5MHZ 발진기가 작동되어 발진된 6.5MHZ 변조신호를 FM변조기(FR)에 인가함으로써 음성입력단자(AI)에 인가된 음성신호를 PAL D/K방식이 6.5MAZ FM신호로 변조시켜 음성출력단자(AO)를 통해 텔레비젼으로 출력하게 된다.The " low " level voltage applied to the control signal input terminal CT of the RF converter RC is inverted by the inverters Q 3 -Q 5 in the RF converter RC, so that the coil L 2 and the capacitor ( A 5.5 MHZ oscillator of C 5 ) and resistor R 13 is supplied with a “low” level voltage and coil L 3 . The 6.5MHZ oscillator is operated by applying a 6.5MHZ oscillator to the 6.5MHZ oscillator composed of a condenser (C 5 ) and a resistor (R 14 ) to apply the oscillated 6.5MHZ modulated signal to the FM modulator (FR). The PAL D / K method modulates the audio signal applied to the terminal AI into 6.5MAZ FM signal, and outputs it to the television through the audio output terminal AO.
이와 같이 본 고안은 입력되는 PAL B/K방식 및 PAL D/K방식의 음성신호에 따라 RF변환기 내의 5.5MHZ 발진기 및 6.5MHZ 발진기를 자동으로 선택하여 음성신호를 FM신호로 변조하도록 함으로써 RF변환기에 별도의 기계적 스위치를 설치하여 수동으로 조작할 필요가 없어 제품의 품질을 향상시킨 유용한 고안이다.As such, the present invention automatically selects the 5.5MHZ oscillator and 6.5MHZ oscillator in the RF converter according to the PAL B / K and PAL D / K input voice signals and modulates the voice signal into an FM signal. It is a useful design that improves the product quality because there is no need to operate manually by installing a separate mechanical switch.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019880009705U KR930001326Y1 (en) | 1988-06-23 | 1988-06-23 | Audio signal demodulation auto-control circuit of multi-system vtr |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019880009705U KR930001326Y1 (en) | 1988-06-23 | 1988-06-23 | Audio signal demodulation auto-control circuit of multi-system vtr |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR900001494U KR900001494U (en) | 1990-01-18 |
| KR930001326Y1 true KR930001326Y1 (en) | 1993-03-22 |
Family
ID=19276594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019880009705U KR930001326Y1 (en) | 1988-06-23 | 1988-06-23 | Audio signal demodulation auto-control circuit of multi-system vtr |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR930001326Y1 (en) |
-
1988
- 1988-06-23 KR KR2019880009705U patent/KR930001326Y1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR900001494U (en) | 1990-01-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5073976A (en) | Signal-to-noise ratio indicating circuit for fm receivers | |
| KR840000117A (en) | Microwave receiver | |
| KR930001326Y1 (en) | Audio signal demodulation auto-control circuit of multi-system vtr | |
| KR890000648B1 (en) | Television sound signal receiver | |
| JP2845253B2 (en) | Keyed pulse detection circuit | |
| KR920002446Y1 (en) | Dual nicam decoder circuit | |
| CA1170355A (en) | Television sound receiver | |
| EP0059379B1 (en) | Noise detecting circuit and television receiver employing the same | |
| KR950001576B1 (en) | Rainfall attenuation compensation circuit of satellite broadcasting receiver | |
| JPH03781Y2 (en) | ||
| JP2661425B2 (en) | AFC device | |
| KR930007449Y1 (en) | Voice eliminating circuit using image signal discriminator of tv | |
| US4530005A (en) | AFC circuit for television tuner | |
| KR930003751Y1 (en) | Tv booster-tuner | |
| JPH0535628Y2 (en) | ||
| KR910003729B1 (en) | Sound and volume control system of catv converter | |
| JP2581579Y2 (en) | Television receiver | |
| JP3118308B2 (en) | Noise detection circuit | |
| KR890001536Y1 (en) | Pilot signal detecting device in sound multi-tv broadcast | |
| KR930003919Y1 (en) | Sound carrier frequency automatic transformation | |
| KR890000290Y1 (en) | Automatic tunning circuit | |
| JPH04351081A (en) | Multi-system television receiver | |
| JPS6221105Y2 (en) | ||
| JP3568396B2 (en) | Audio IF signal identification device | |
| JP2572471Y2 (en) | FM stereo receiver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E701 | Decision to grant or registration of patent right | ||
| REGI | Registration of establishment | ||
| FPAY | Annual fee payment |
Payment date: 19961231 Year of fee payment: 5 |
|
| LAPS | Lapse due to unpaid annual fee |