US3836707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video signal processing device for extracting the chrominance and luminance signals from a composite video signal in a color television receiver
Assignee: Hitachi Ltd
•
Filing: 1972-12-27
•
Granted: 1974-09-17
•
Expires: 1992-12-27
Abstract
Abstract 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.
Inventors
- 👤 T Murakami
- 👤 A Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:09
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/77; H04N9/78
Claims Analysis
Total Claims: 91
Claim 1
Independent Claim
243 words
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.
Claim 2
Dependent Claim
243 words
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.
Claim 3
Dependent Claim
25 words
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;
Claim 4
Dependent Claim
25 words
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;
Claim 5
Dependent Claim
30 words
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;
Claim 6
Dependent Claim
30 words
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;
Claim 7
Dependent Claim
12 words
a low-pass filter for extracting low-frequency components from said composite video signal;
Claim 8
Dependent Claim
12 words
a low-pass filter for extracting low-frequency components from said composite video signal;
Claim 9
Dependent Claim
32 words
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;
Claim 10
Dependent Claim
32 words
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;
Claim 11
Dependent Claim
65 words
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.
Claim 12
Dependent Claim
35 words
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;
Claim 13
Dependent Claim
35 words
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;
Claim 14
Dependent Claim
26 words
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;
Claim 15
Dependent Claim
26 words
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;
Claim 16
Dependent Claim
35 words
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;
Claim 17
Dependent Claim
35 words
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;
Claim 18
Dependent Claim
19 words
an adder for adding the input and the output of said delay means for obtaining the luminance signal components;
Claim 19
Dependent Claim
19 words
an adder for adding the input and the output of said delay means for obtaining the luminance signal components;
Claim 20
Dependent Claim
62 words
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.
Claim 21
Dependent Claim
27 words
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;
Claim 22
Dependent Claim
27 words
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;
Claim 23
Dependent Claim
21 words
a single comb-shaped filter connected to the output of the signal wave processing unit for extracting the chrominance signal components therefrom;
Claim 24
Dependent Claim
21 words
a single comb-shaped filter connected to the output of the signal wave processing unit for extracting the chrominance signal components therefrom;
Claim 25
Dependent Claim
35 words
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;
Claim 26
Dependent Claim
35 words
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;
Claim 27
Dependent Claim
21 words
a single comb-shaped filter connected to the output of the signal wave processing unit for extracting the luminance signal components therefrom;
Claim 28
Dependent Claim
21 words
a single comb-shaped filter connected to the output of the signal wave processing unit for extracting the luminance signal components therefrom;
Claim 29
Dependent Claim
26 words
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;
Claim 30
Dependent Claim
26 words
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;
Claim 31
Dependent Claim
20 words
a first adder for adding the input and the output of said delay means for obtaining the luminance signal components;
Claim 32
Dependent Claim
20 words
a first adder for adding the input and the output of said delay means for obtaining the luminance signal components;
Claim 33
Dependent Claim
20 words
a feedback circuit to feed the output of said subtractor back to the input side of said delay means; and
Claim 34
Dependent Claim
20 words
a feedback circuit to feed the output of said subtractor back to the input side of said delay means; and
Claim 35
Dependent Claim
20 words
a feedback circuit for feeding the output of said first adder back to the input side of said delay means;
Claim 36
Dependent Claim
20 words
a feedback circuit for feeding the output of said first adder back to the input side of said delay means;
Claim 37
Dependent Claim
19 words
a subtractor for subtracting the output of said comb-shaped filter from the output of said signal wave processing unit;
Claim 38
Dependent Claim
19 words
a subtractor for subtracting the output of said comb-shaped filter from the output of said signal wave processing unit;
Claim 39
Dependent Claim
19 words
a subtractor for subtracting the output of said comb-shaped filter from the output of said signal wave processing unit;
Claim 40
Dependent Claim
19 words
a subtractor for subtracting the output of said comb-shaped filter from the output of said signal wave processing unit;
Claim 41
Dependent Claim
20 words
a gain controller for regulating the output level of the luminance signal components extracted through said filter circuit means; and
Claim 42
Dependent Claim
20 words
a gain controller for regulating the output level of the luminance signal components extracted through said filter circuit means; and
Claim 43
Dependent Claim
58 words
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.
Claim 44
Dependent Claim
59 words
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;
Claim 45
Dependent Claim
59 words
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;
Claim 46
Dependent Claim
20 words
a feedback circuit for feeding the output of said subtractor back to the input side of said delay means; and
Claim 47
Dependent Claim
20 words
a feedback circuit for feeding the output of said subtractor back to the input side of said delay means; and
Claim 48
Dependent Claim
31 words
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.
Claim 49
Dependent Claim
31 words
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.
Claim 50
Dependent Claim
20 words
a gain controller for regulating the output level of the luminance signal components extracted through said filter circuit means; and
Claim 51
Dependent Claim
20 words
a gain controller for regulating the output level of the luminance signal components extracted through said filter circuit means; and
Claim 52
Dependent Claim
58 words
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.
Claim 53
Dependent Claim
18 words
a gain controller for regulating the output level of the luminance signal components extracted through said subtractor; and
Claim 54
Dependent Claim
18 words
a gain controller for regulating the output level of the luminance signal components extracted through said subtractor; and
Claim 55
Dependent Claim
20 words
a second subtractor for subtracting the output of said feedback circuit from the output of said signal wave processing unit.
Claim 56
Dependent Claim
20 words
a second subtractor for subtracting the output of said feedback circuit from the output of said signal wave processing unit.
Claim 57
Dependent Claim
56 words
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.
Claim 58
Dependent Claim
56 words
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.
Claim 59
Dependent Claim
19 words
a gain controller for regulating the output level of the luminance signal components extracted through said comb-shaped filter; and
Claim 60
Dependent Claim
19 words
a gain controller for regulating the output level of the luminance signal components extracted through said comb-shaped filter; and
Claim 61
Dependent Claim
30 words
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.
Claim 62
Dependent Claim
30 words
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.
Claim 63
Dependent Claim
53 words
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.
Claim 64
Dependent Claim
53 words
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.
Claim 65
Dependent Claim
55 words
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.
Claim 66
Dependent Claim
55 words
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.
Claim 67
Dependent Claim
58 words
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.
Claim 68
Dependent Claim
56 words
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.
Claim 69
Dependent Claim
56 words
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.
Claim 70
Dependent Claim
28 words
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.
Claim 71
Dependent Claim
11 words
A video signal processing device for a color television receiver comprising:
Claim 72
Dependent Claim
11 words
A video signal processing device for a color television receiver comprising:
Claim 73
Dependent Claim
59 words
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.
Claim 74
Dependent Claim
54 words
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.
Claim 75
Dependent Claim
51 words
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.
Claim 76
Dependent Claim
58 words
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.
Claim 77
Dependent Claim
57 words
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.
Claim 78
Dependent Claim
58 words
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.
Claim 79
Dependent Claim
17 words
A video signal processing device as set forth in claim 8 wherein said filter circuit means comprises:
Claim 80
Dependent Claim
17 words
A video signal processing device as set forth in claim 8 wherein said filter circuit means comprises:
Claim 81
Dependent Claim
17 words
A video signal processing device as set forth in claim 8 wherein said filter circuit means comprises:
Claim 82
Dependent Claim
11 words
A video signal processing device for a color television receiver comprising:
Claim 83
Dependent Claim
11 words
A video signal processing device for a color television receiver comprising:
Claim 84
Dependent Claim
59 words
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.
Claim 85
Dependent Claim
51 words
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.
Claim 86
Dependent Claim
58 words
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.
Claim 87
Dependent Claim
11 words
A video signal processing device for a color television receiver comprising:
Claim 88
Dependent Claim
11 words
A video signal processing device for a color television receiver comprising:
Claim 89
Dependent Claim
54 words
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.
Claim 90
Dependent Claim
57 words
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.
Claim 91
Dependent Claim
58 words
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.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |