KR950003906Y1 - S-vhs/vhs method judgement circuit of vcr - Google Patents
S-vhs/vhs method judgement circuit of vcr Download PDFInfo
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- KR950003906Y1 KR950003906Y1 KR2019890008656U KR890008656U KR950003906Y1 KR 950003906 Y1 KR950003906 Y1 KR 950003906Y1 KR 2019890008656 U KR2019890008656 U KR 2019890008656U KR 890008656 U KR890008656 U KR 890008656U KR 950003906 Y1 KR950003906 Y1 KR 950003906Y1
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- high frequency
- luma
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
- H04N9/83—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only the recorded chrominance signal occupying a frequency band under the frequency band of the recorded brightness signal
- H04N9/832—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only the recorded chrominance signal occupying a frequency band under the frequency band of the recorded brightness signal using an increased bandwidth for the luminance or the chrominance signal
- H04N9/833—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only the recorded chrominance signal occupying a frequency band under the frequency band of the recorded brightness signal using an increased bandwidth for the luminance or the chrominance signal with selection of the conventional or the increased bandwidth signal, e.g. VHS or SVHS signal selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/78—Television signal recording using magnetic recording
- H04N5/782—Television signal recording using magnetic recording on tape
Abstract
내용 없음.No content.
Description
제1도는 종래의 S-VHS/VHS 판별 회로도.1 is a conventional S-VHS / VHS discrimination circuit diagram.
제2도는 본 고안의 S-VHS/VHS 판별 회로도.2 is an S-VHS / VHS discrimination circuit diagram of the present invention.
제3도는 본 고안 비교기의 입출력 파형에 대한 특성도.3 is a characteristic diagram of input and output waveforms of the comparator of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 앰프 2 : 고역 통과 필터1: amplifier 2: high pass filter
3 : 피크 검파부 4,15,16 : 비교기3: peak detector 4,15,16: comparator
5 : S-VHS고주파 이퀼라이저 6 : S-VHS 루마 복조부5: S-VHS high frequency equalizer 6: S-VHS luma demodulator
7 : 절환스위치 8 : VHS 고주파 이퀼라이저7: selector switch 8: VHS high frequency equalizer
9 : VHS 루마 복조부 10 : 크로마 재생부9: VHS luma demodulation unit 10: Chroma regeneration unit
11 : 휘도/색 필터부 12 : 믹서11 luminance / color filter unit 12 mixer
13,14 : 평활회로 17 : 마이콤13,14: smoothing circuit 17: micom
본 고안은 브이씨알(VCR)의 녹화 판별회로에 관한 것으로, 특히 테이프의 녹화방식인 S-VHS, VHS방식을 판별하여 그 녹화방식에 맞게 절환하는데 적당하도록 한 브이씨알의 S-VHS/VHS방식 판별회로에 관한 것이다.The present invention relates to a recording discrimination circuit of VCR (VCR), in particular, V-SAL's S-VHS / VHS method which is suitable to distinguish the recording method of tape S-VHS, VHS method and switch to the recording method. It relates to a discrimination circuit.
종래 브이씨알의 S-VHS/VHS 판별회로는 제1도에 도시된 바와 같이, 입력되는 재생 고주파신호가 앰프(1)에서 3.4MHz의 고주파성분을 증폭된 후 고역 통과 필터(2)를 통해 피크 검파기(3)에 인가된다. 이때 피크 검파기(3)에서 3.4MHz의 고주팡성분을 검파하여 이에 대응하는 전압을 비교기(4)에 입력시킨 후 기준전압과 비교하여, 재생 고주파신호가 S-VHS방식으로 기록되어 있으며 고전위, VHS로 기록되어 있으면 저전위를 출력하며, 이의 신호가 절환스위치(7)를 제어하여 각각의 모드에 맞도록 단자(a) 또는 단자(b)로 절환시킨다.In the conventional V-SR S-VHS / VHS discrimination circuit, as shown in FIG. 1, an input regenerated high frequency signal is amplified by a high frequency component of 3.4 MHz in the amplifier 1 and then peaked through the high pass filter 2. Is applied to the detector 3. At this time, the peak detector 3 detects a high frequency component of 3.4 MHz, inputs a corresponding voltage into the comparator 4, and compares it with a reference voltage. The reproduced high frequency signal is recorded in the S-VHS method. If it is recorded as VHS, a low potential is output, and its signal controls the switching switch 7 to switch to terminal a or terminal b for each mode.
따라서, 이때 재생 고주파신호는 S-VHS 고주파 이퀼라이저(5) 및 S-VHS 루마(Luma) 복조부(6)를 통해 휘도신호가 복조되어 그 절환스위치(7)의 단자(a)에 인가되고 상기 재생 고주파신호는 VHS 고주파 이퀼라이저(8) 및 VHS 루마 복조부(9)를 통해 휘도신호로 복조되어 절환스위치(7)의 단자(b)에 인가되는데, 이와 같이 절환스위치(7)의 단자(a), (b)에 인가되는 신호는 상기 비교기(4)의 출력신호에 따라 선택된 후 휘도/색필터부(11)를 통해 휘도신호만이 출력되고, 이 출력신호가 크로마 재생부(10)를 통해 전송되는 재생 고주파신호의 색신호와 믹서(12)에서 합성되어 비데오 출력신호로 전송된다.Accordingly, the reproduction high frequency signal is demodulated through the S-VHS high frequency equalizer 5 and the S-VHS luma demodulator 6 and applied to the terminal a of the switching switch 7. The reproduced high frequency signal is demodulated as a luminance signal through the VHS high frequency equalizer 8 and the VHS luma demodulator 9 and applied to the terminal b of the switching switch 7. ), (b) is selected according to the output signal of the comparator 4, and then only the luminance signal is output through the luminance / color filter unit 11, and this output signal is used to output the chroma reproducing unit 10. The color signal of the reproduction high frequency signal transmitted through the mixer 12 is synthesized and transmitted as a video output signal.
그런데, 상기와 같은 종래 브이씨알의 S-VHS/VHS 판별회로에 있어서는 고주파신호가 없는 상태에서 잡음이 발생될 경우에는 오동작을 유기하게 되는 문제점이 있었다.By the way, in the conventional S-VHS / VHS discriminating circuit of V-Cal as described above, there is a problem in that a malfunction occurs when noise is generated in the absence of a high frequency signal.
본 고안은 이와 같은 종래의 문제점을 해결하기 위해서, 복조된 비데오신호의 동기신호를 검출하여 녹화테이프의 상태를 판별함으로써 잡음에 의한 오동작을 제거하도록 한 브이씨알의 S-VHS/VHS방식 판별회로를 안출한 것으로, 이하 첨부한 도면에 의해 상세히 설명한다.In order to solve such a conventional problem, V-SAL's S-VHS / VHS type discrimination circuit which detects the synchronization signal of the demodulated video signal and determines the state of the recording tape to eliminate malfunction caused by noise The present invention will be described in detail with reference to the accompanying drawings.
제2도는 본 고안 브이씨알의 S-VHS/VHS 판별회로도로서 이에 도시한 바와 같이, 재생 고주파신호가 S-VHS 고주파 이퀼라이저(5) 및 S-VHS 루마 복조부(6)와 VHS 고주파 이퀼라이저(8) 및 VHS 루마 복조부(9)를 각기 통해 복조된 후 절환스위치(7)를 통해 선택되고, 이 절환스위치(7)의 선택 출력신호가 휘도/색 필터부(11)를 통해 휘도신호로 분리된 후 크로마 재생부(10)를 통과한 상기 재생 고주파신호의 색신호와 믹서(12)에서 합성되어 비데오신호로 출력되게 구성된 브이씨알에 있어서, 상기 S-VHS 루바 복조부(6) 및 VHS 루마복조부(9)로부터 동기 분리신호를 각기 입력받아 직류레벨로 검출하는 평활회로(4)(13)와, 상기 평활회로(13), (14)의 출력전압을 설정된 기준전압과 각기 비교하는 비교기(15), (16)와, 상기 비교기(15), (16)의 출력신호를 판단하여 해당 고주파신호가 출력되도록 상기 절환스위치(7)를 제어하고, 상기 믹서(12)의 출력을 제어하는 마이콤(17)으로 구성한다.2 is an S-VHS / VHS discrimination circuit diagram of the V-seal according to the present invention, and as shown therein, the reproduced high-frequency signals include the S-VHS high-frequency equalizer 5, the S-VHS luma demodulator 6, and the VHS high-frequency equalizer 8 ) And the VHS luma demodulator 9 are demodulated separately and then selected through a changeover switch 7, and the selected output signal of the changeover switch 7 is separated into a luminance signal through the luminance / color filter unit 11. The V-RHS demodulator 6 and the VHS luma box, which are composed of the color signal of the reproduced high frequency signal passed through the chroma reproducing unit 10 and the mixer 12, are output as a video signal. A comparator for receiving the synchronous separation signal from the roughening unit 9 and comparing the output voltages of the smoothing circuits 13 and 14 with the set reference voltages, respectively, 15), 16 and the output signals of the comparators 15 and 16 are judged to output corresponding high frequency signals. To control the change-over switch (7), which are configured as a microcomputer 17 which controls the output of the mixer (12).
제3도는 본 고안 비교기(15)(16)이 입출력 파형에 대한 특성도로서 이에 도시한 바와 같이, 입력 비교전압(V3)이 기준전압(V2)보다 크게 되면 S-VHS 루마 복조부(6), VHS 루마 복조부(9)로부터 동기신호가 검출된 것으로 판별하고, 비교전압(V1)이 기준전압(V2)보다 작게 되면 상기 동기신호가 검출되지 않은 것으로 판별하여 마이콤(17)에 전송한다.3 is a characteristic diagram of input and output waveforms of the inventive comparator 15 and 16. When the input comparison voltage V3 is larger than the reference voltage V2, the S-VHS luma demodulator 6 When it is determined that the synchronization signal is detected from the VHS luma demodulator 9, and the comparison voltage V1 is smaller than the reference voltage V2, it is determined that the synchronization signal has not been detected and transmitted to the microcomputer 17.
이와 같이 구성된 본 고안의 작용효과를 설명하면 다음과 같다.Referring to the effect of the present invention configured as described above are as follows.
우선 종래의 기술에서 설명한 바와 같이 입력되는 재생 고주파신호가 크로마 재생부(10)를 통해 색신호로 재생되어 믹서(12)에 인가되고, 또한 이때 그 재생 고주파신호가 S-VHS 고주파 이퀼라이저(5) 및 S-VHS 루마 복조부(6)를 통해 복조되어 절환스위치(7)의 단자(a)에 인가되고, 또한 그 재생 고주파신호가 VHS 고주파 이퀼라이저(8) 및 VHS 루마 복조부(9)를 통해 복조되어 절환스위치 (7)의 단자(b)에 인가된다.First, as described in the related art, a reproduced high frequency signal inputted through the chroma reproducing unit 10 is reproduced as a color signal and applied to the mixer 12. At this time, the reproduced high frequency signal is applied to the S-VHS high frequency equalizer 5 and Demodulated through the S-VHS luma demodulator 6 and applied to the terminal a of the switch 7, and the reproduced high frequency signal is demodulated through the VHS high frequency equalizer 8 and the VHS luma demodulator 9; Is applied to the terminal (b) of the selector switch (7).
이때 S-VHS 루마 복조부(6) 및 VHS 루마 복조부(9)로부터 출력되는 동기 분리신호가 평활회로(14)(13)에 각기 입력된 후 평활되어 직류레벨로 검출되며, 이 평활회로(13), (14)의 출력전압이 비교기(15)(16)에서 기준접압과 각기 비교되어, 그 비교결과신호가 마이콤(17)에 입력된다.At this time, the synchronous separation signals output from the S-VHS luma demodulator 6 and the VHS luma demodulator 9 are input to the smoothing circuits 14 and 13, respectively, and smoothed to detect the DC level. The output voltages of the 13 and 14 are compared with the reference voltages in the comparators 15 and 16, respectively, and the comparison result signal is input to the microcomputer 17.
여기서 일예로 입력되는 재생 고주파신호가 S-VHS 방식으로 녹화되어 있는 신호하면 S-VHS 루마 복조부(6)에서는 동기 분리신호가 출력되고 VHS 루마 복조부(9)에서는 동기 분리신호가 출력되지 않게 되므로 평활회로(13), (14)의 출력전압은 제3도에 도시한 바와 같이 전압레벨(V1), (V3)로 되어, 비교기(15)(16)에서 기준전압(V2)과 비교된다. 따라서 이때 비교기(16)에서는 고전위신호가 출력되고 비교기(15)에서는 저전위신호가 출력되어 마이콤(17)에 입력되므로, 그 마이콤(17)에서는 S-VHS 방식의 녹화에 따른 고주파신호가 입력되고 있음을 판별할 수 있게 된다.Here, if the reproduction high frequency signal inputted as an example is recorded in the S-VHS method, the synchronous separation signal is output from the S-VHS luma demodulator 6 and the synchronous separation signal is not output from the VHS luma demodulator 9. Therefore, the output voltages of the smoothing circuits 13 and 14 become voltage levels V1 and V3 as shown in FIG. 3, and are compared with the reference voltage V2 in the comparators 15 and 16. FIG. . Therefore, since the high potential signal is output from the comparator 16 and the low potential signal is output from the comparator 15 and input to the microcomputer 17, the high frequency signal according to the recording of the S-VHS method is input from the microcomputer 17. Can be determined.
또한 입력되는 재생 고주파신호가 VHS방식으로 녹화되어 있는 신호라면, 평활회로(13)(14)의 출력전압이 상기와는 반대로 제3도의 전압레벨(V3)(V1)로 되어 비교기(15)에서 고전위신호가 출력되고, 비교기(16)에서 저전위신호가 출력된다. 따라서, 이때 마이콤(17)에서는 VHS 방식의 녹화에 따른 재생 고주파신호가 입력되고 있음을 판별할 수 있게 된다.If the reproduction high frequency signal inputted is a signal recorded in the VHS system, the output voltage of the smoothing circuits 13 and 14 becomes the voltage level V3 (V1) of FIG. The high potential signal is output, and the low potential signal is output from the comparator 16. Therefore, at this time, the microcomputer 17 can determine whether the reproduction high frequency signal corresponding to the recording of the VHS system is input.
따라서, 상기와 같이 마이콤(17)에서 S-VHS 방식의 녹화에 따른 재생 고주파신호가 입력되고 있는 것으로 판별한 경우에는 절환스위치(7)를 단자(a)로 절환하여 S-VHS 루마 복조부(6)의 출력신호를 선택 출력하게 하며, 마이콤(17)에서 VHS방식의 녹화에 따른 재생 고주파신호가 입력되고 있는 것으로 판별한 경우에는 절환스위치가(7)를 단자(b)로 절환하여 VHS 루마 복조부(9)의 출력을 선택하게 한다. 이와같이 절환스위치(7)에서 선택되어 출력되는 신호는 휘도/색 팰터부(11)를 통해 휘도신호로 검출되어 믹서(12)에 입력된다. 이와 동시에 마이콤(17)의 모니터 제어신호로 약간의 시간차이를 두어 믹서(12)를 제어함에 따라 크로마 재생부(10)에서 출력되는 크로마신호와 상기 휘도/색 필터부(11)에서 출력되는 휘도신호가 그 믹서(12)에서 합성되어 정상적인 비데오신호로 출력된다.Therefore, when the microcomputer 17 determines that the reproduction high frequency signal corresponding to the recording of the S-VHS system is being input as described above, the switching switch 7 is switched to the terminal a so that the S-VHS luma demodulator ( 6) selects and outputs the output signal, and when the microcomputer 17 determines that the reproduction high frequency signal according to the recording of the VHS system is being input, the changeover switch 7 switches to the terminal b to change the VHS luma. The output of the demodulator 9 is selected. In this way, the signal selected and output from the changeover switch 7 is detected as a luminance signal through the luminance / color filter unit 11 and input to the mixer 12. At the same time, by controlling the mixer 12 with a slight time difference by the monitor control signal of the microcomputer 17, the chroma signal output from the chroma reproducing unit 10 and the luminance output from the luminance / color filter unit 11. The signal is synthesized in the mixer 12 and output as a normal video signal.
이상에서 상세히 설명한 바와 같이 본 안은 비데오 동기신호를 검출하여 녹화테이프의 녹화방식상태를 판별하므로 잡음에 의한 오동작을 제거할 수 있게 되어 제품의 신뢰성을 향상시킬 수 있는 효과가 있게 된다.As described in detail above, the present invention detects the video synchronization signal to determine the recording method state of the recording tape, so that malfunctions caused by noise can be eliminated, thereby improving the reliability of the product.
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| KR2019890008656U KR950003906Y1 (en) | 1989-06-22 | 1989-06-22 | S-vhs/vhs method judgement circuit of vcr |
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| KR2019890008656U KR950003906Y1 (en) | 1989-06-22 | 1989-06-22 | S-vhs/vhs method judgement circuit of vcr |
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| KR950003906Y1 true KR950003906Y1 (en) | 1995-05-17 |
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|---|---|
| KR910001906U (en) | 1991-01-25 |
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