Video signal processing device for extracting the chrominance and luminance signals from a composite video signal in a color television receiver
阅读：786发布：2022-03-10
专利汇可以提供Video signal processing device for extracting the chrominance and luminance signals from a composite video signal in a color television receiver专利检索，专利查询，专利分析的服务。并且A video signal processing device for a color television receiver includes a low-pass filter for obtaining lower frequency components out of a composite video signal consisting of a luminance signal and a carrier chrominance signal, a band-pass filter for obtaining higher frequency components of the composite video signal, and a signal wave processing unit for delivering the second order differential of the composite video signal. There is provided in the device a first comb-shaped filter and a second comb-shaped filter for obtaining carrier chrominance signal components and luminance signal components from the outputs of the band-pass filter and the signal wave processing unit, respectively, and an adder for adding the luminance signal components extracted from the output of the signal wave processing unit by means of the second comb-shaped filter to the output obtained from the low-pass filter, whereby a low noise luminance signal added with a preshoot and an overshoot can be obtained from the adder, and a carrier chrominance signal also of low noise can be obtained from the first comb-shaped filter. Alternate embodiments are also simplified by the fact that only a single comb-shaped filter is required.，下面是Video signal processing device for extracting the chrominance and luminance signals from a composite video signal in a color television receiver专利的具体信息内容。
1. A video signal processing device for a color television receiver comprising: 1. a band-pass filter for extracting high-frequency components from a composite video signal including a chrominance signal and a luminance signal and formed in such a manner that the chrominance signal exists in a frequency interleaving relation in the high-frequency range of the luminance signal; 2. a low-pass filter for extracting low-frequency components from said composite video signal; 3. a signal wave processing unit for processing the waveform of said composite video signal for the purpose of obtaining a preshoot and an overshoot to be applied on the output signal from said low-pass filter; 4. filter circuit means including a first comb-shaped filter connected to the output of said band-pass filter for extracting the chrominance signal components from the output of said bandpass filter and a second comb-shaped filter connected to the output of said signal wave processing unit for extracting the luminance signal components from the output of said signal wave processing unit; 5. a gain controller for regulating the output level of the luminance signal components extracted through said filter circuit means; and 6. an adder for adding the output of said low-pass filter and the output of said gain controller; whereby a low noise chrominance signal is obtained from said comb-shaped filter circuit means, and a luminance signal of low noise and rendered with a preshoot and an overshoot both adjustable to desired levels is obtained from said adder.
2. a subtractor for subtracting the output of said delay means from the output of said signal wave processing unit for obtaining the chrominance signal components;
2. a subtractor for subtracting either one of the input signal and output signal for said delay means from the other of the same thereby to extract the chrominance signal components;
2. a low-pass filter for extracting low-frequency components from said composite video signal;
2. a signal wave processing unit for processing the waveform of said composite video signal for obtaining a preshoot and an overshoot to be applied on the output signal from said low-pass filter;
2. A video signal processing device for a color television receiver as set forth in claim 1 wherein: said first comb-shaped filter has maximum attenuating points at the horizontal synchronizing frequency fH of said composite video signal and its higher harmonic frequencies n fH where n is a positive integer, and said second comb-shaped filter has maximum attenuation points at frequencies (n + 1/2 ) fH.
2. a signal wave processing unit connected to receive the composite video signal for processing the waveform thereof to obtain a preshoot and an overshoot to be applied on the output signal from said low-pass filter;
2. a first subtractor for subtracting the output of said signal wave processing unit from the output of said delay means for obtaining the chrominance signal components;
2. a signal wave processing unit connected to receive the composite video signal for processing the waveform thereof to obtain a preshoot and an overshoot to be applied on the output signal from said low-pass filter;
3. an adder for adding the input and the output of said delay means for obtaining the luminance signal components;
3. A video signal processing device as set forth in claim 1 wherein: said first comb-shaped filter comprises a delay circuit for delaying the input signal for a period of TH where TH designates one horizontal scanning period and a subtractor for subtracting either one of the output from the delay circuit and the input signal to said delay circuit from the other.
3. filter circuit means including a comb-shaped filter for extracting the chrominance signal components and the luminance signal components from the output of said signal wave processing unit;
3. a single comb-shaped filter connected to the output of the signal wave processing unit for extracting the chrominance signal components therefrom;
3. a signal wave processing unit for processing the waveform of said composite video signal for the purpose of obtaining a preshoot and an overshoot to be applied on the output signal from said low-pass filter;
3. a single comb-shaped filter connected to the output of the signal wave processing unit for extracting the luminance signal components therefrom;
3. a first adder for adding the output of said signal wave processing unit and the output of said delay means for obtaining the luminance signal components;
3. a first adder for adding the input and the output of said delay means for obtaining the luminance signal components;
4. a feedback circuit to feed the output of said subtractor back to the input side of said delay means; and
4. a feedback circuit for feeding the output of said first adder back to the input side of said delay means;
4. a subtractor for subtracting the output of said comb-shaped filter from the output of said signal wave processing unit;
4. a subtractor for subtracting the output of said comb-shaped filter from the output of said signal wave processing unit;
4. a gain controller for regulating the output level of the luminance signal components extracted through said filter circuit means; and
4. A video signal processing device as set forth in claim 3 wherein said first comb-shaped filter is further provided with a feedback circuit to feedback the output of said subtractor to the input side of the delay circuit, whereby the frequency characteristic of the comb-shaped filter can be varied by varying the feedback ratio of said feedback circuit.
4. filter circuit means including a first comb-shaped filter connected to the output of said band-pass filter for extracting the chrominance signal components from the output of said band-pass filter and a second comb-shaped filter connected to the output of said signal wave processing unit for extracting the luminance signal components from the output of said signal wave processing unit;
4. a feedback circuit for feeding the output of said subtractor back to the input side of said delay means; and
5. a second adder for adding the output of said feedback circuit and the output of said signal wave processing unit for applying the thus added output signal to said delay means.
5. a gain controller for regulating the output level of the luminance signal components extracted through said filter circuit means; and
5. A video signal processing device as set forth in claim 1 wherein said second comb-shaped filter comprises a delAy circuit for delaying the input signal applied thereto for a period of TH where TH is one horizontal scanning period and an adder for adding the output from the delay circuit to said input signal of said comb-shaped filter.
5. a gain controller for regulating the output level of the luminance signal components extracted through said subtractor; and
5. a second subtractor for subtracting the output of said feedback circuit from the output of said signal wave processing unit.
5. an adder for adding the output of said low-pass filter and the output of said gain controller; whereby a low noise chrominance signal is obtained from said filter circuit means, and a luminance signal of low noise and rendered with a preshoot and an overshoot both being adjustable to desired levels is obtained from said adder.
5. a gain controller for regulating the output level of the luminance signal components extracted through said comb-shaped filter; and
5. a second adder for adding the output of said feedback circuit and the output of said signal wave processing unit for applying the thus obtained output to said delay means.
6. an adder for adding the output of said low-pass filter and the output of said gain controller; whereby a low noise chrominance signal is obtained from said suBtractor and a luminance signal of low noise provided with a preshoot and an overshoot both being adjustable to desired levels is obtained from said adder.
6. an adder for adding the output of said low-pass filter and the output of said gain controller; whereby a low noise chrominance signal is obtained from said comb-shaped filter and a luminance signal of low noise and rendered with a preshoot and an overshoot both being adjustable to desired levels is obtained from said adder.
6. A video signal processing device as set forth in claim 5 wherein said second comb-shaped filter is further provided with a feedback circuit to feedback the output of said adder to the input side of said delay circuit, whereby the frequency characteristic of said comb-shaped filter can be varied by varying the feedback ratio of said feedback circuit.
6. an adder for adding the output of said low-pass filter and the output of said gain controller; whereby a low noise chrominance signal is obtained from said comb-shaped filter circuit means, and a luminance signal of low noise and rendered with a preshoot and an overshoot both adjustable to desired levels is obtained from said adder.
7. A video signal processing device as set forth in claim 1 wherein said signal wave processing unit is provided in the form of a second order differentiating circuit.
8. A video signal processing device for a color television receiver comprising:
9. A video signal processing device as set forth in claim 8 wherein said filter circuit means comprises a comb-shaped filter having maximum attenuating points at frequencies (n + 1/2 ) fH thereby to extract the luminance signal components from the input signal applied thereto, and a subtractor for subtracting the output of said comb-shaped filter from said input signal.
10. A video signal processing device as set forth in claim 8 wherein said filter circuit means comprises a comb-shaped filter having maximum attenuating points at frequencies n fH thereby to extract the chrominance signal components from the input signal, and a subtractor for subtracting the output of said comb-shaped filter from said input signal.
11. A video signal processing device as set forth in claim 9 wherein said comb-shaped filter comprises a delay circuit for delaying the input signal for a period of TH, where TH is one horizontal scanning period, and an adder for adding the output of said delay circuit to said input signal.
12. A video signal processing device as set forth in claim 11 wherein said comb-shaped filter is further provided with a feedback circuit for feeding the output of said adder back to the input side of said delay circuit whereby the frequency characteristic of said comb-shaped filter can be varied by varying the feedback ratio of said feedback circuit.
13. A video signal processing device as set forth in claim 10 wherein said comb-shaped filter comprises a delay circuit for delaying the input signal for a period of TH, where TH is one horizontal scanning period, and a subtractor for subtracting either one of said input signal and the output of said delay circuit from the other.
14. A video signal processing device as set forth in claim 13 wherein said comb-shaped filter is further provided with a feedback circuit to feed the output of the subtractor back to thE input side of said delay circuit whereby the frequency characteristic of said comb-shaped filter can be varied by varying the feedback ratio of said feedback circuit.
15. A video signal processing device as set forth in claim 8 wherein said filter circuit means comprises:
16. A video signal processing device as set forth in claim 8 wherein said filter circuit means comprises:
17. A video signal processing device as set forth in claim 8 wherein said filter circuit means comprises:
18. A video signal processing device for a color television receiver comprising:
19. A video signal processing device as set forth in claim 18 wherein said filter circuit means comprises a comb-shaped filter having maximum attenuating points at frequencies (n + 1/2 ) fH thereby to extract the luminance signal components from the input signal applied thereto, and a subtractor for subtracting the output of said comb-shaped filter from said input signal.
20. A video signal processing device as set forth in claim 19 wherein said comb-shaped filter comprises a delay circuit for delaying the input signal for a period of TH, where TH is one horizontal scanning period, and an adder for adding the output of said delay circuit to said input signal.
21. A video signal processing device as set forth in claim 20 wherein said comb-shaped filter is further provided with a feedback circuit for feeding the output of said adder back to the input side of said delay circuit whereby the frequency characteristic of said comb-shaped filter can be varied by varying the feedback ratio of said feedback circuit.
22. A video signal processing device for a color television receiver comprising:
23. A video signal processing device as set forth in claim 22 wherein said filter circuit means comprises a comb-shaped filter having maximum attenuating points at frequencies n fH thereby to extract the chrominance signal components from the input signal, and a subtractor for subtracting the output of said comb-shaped filter from said input signal.
24. A video signal processing device as set forth in claim 23 wherein said comb-shaped filter comprises a delay circuit for delaying the input signal for a period of TH, where TH is one horizontal scanning period, and a subtractor for subtracting either one of said input signal and the output of said delay circuit from the other.
25. A video signal processing device as set forth in claim 24 wherein said comb-shaped filter is further provided with a feedback circuit to feed the output of the subtractor back to the input side of said delay circuit whereby the frequency characteristic of said comb-shaped filter can be varied by varying the feedback ratio of said feedback circuit.
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