Patent FR557806A successfully refreshed from Google Patents.
US4947243A
Expired / Lapsed
US
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Method of and arrangements for coding and decoding color television signals using a separate series arrangement of a low-pass filter and a vertical temporal filter for each color difference signal
Assignee: GRUNDIG E M V ELEKTRO-MECHANISCHE VERSUCHSANSTALT MAX GRUNDIG HOLLAND STIFTUNG and Co KG
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Filing: 1989-03-03
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Granted: 1990-08-07
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Expires: 2009-03-03
Abstract
Abstract A color television transmission systems including three-dimensional filtering operations at the transmitter and receiver ends with the object of obtaining a lowest possible number of interferences in the form of cross color and cross-luminance on display in which each one of the two color difference signal channels has its own three-dimensional sub-filtering operation, wherein the two sub-filters are dimensioned differently.
Inventors
- 👤 Broder Wendland
- 👤 Michael Silverberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:33
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/646
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
147 words
An arrangement for coding color television signals, comprising: means for providing a luminance signal and first and second color difference signals; a three-dimensional filter circuit coupled to receive said luminance signal, for providing a filtered luminance signal; first and second three-dimensional sub-filters coupled to receive said first and second color difference signals, respectively, for providing filtered color difference signals, said first and second sub-filters each being constituted by a series arrangement of a low-pass filter and a combined vertical-temporal filter; a quadrature modulator for converting said filtered color difference signals into a modulated chrominance signal; and an adder circuit for adding together said filtered luminance signal and the modulated chrominance signal; characterized in that the passband of the combined vertical-temporal filter coupled to receive said first color difference signal is less than the passband of the combined vertical-temporal filter coupled to receive said second color difference signal.
Claim 2
Dependent Claim
147 words
An arrangement for coding color television signals, comprising: means for providing a luminance signal and first and second color difference signals; a three-dimensional filter circuit coupled to receive said luminance signal, for providing a filtered luminance signal; first and second three-dimensional sub-filters coupled to receive said first and second color difference signals, respectively, for providing filtered color difference signals, said first and second sub-filters each being constituted by a series arrangement of a low-pass filter and a combined vertical-temporal filter; a quadrature modulator for converting said filtered color difference signals into a modulated chrominance signal; and an adder circuit for adding together said filtered luminance signal and the modulated chrominance signal; characterized in that the passband of the combined vertical-temporal filter coupled to receive said first color difference signal is less than the passband of the combined vertical-temporal filter coupled to receive said second color difference signal.
Claim 3
Dependent Claim
30 words
An arrangement as claimed in claim 1, characterized in that the three-dimensional filter circuit coupled to receive said luminance signal comprises a low-pass filter and a further combined vertical-temporal filter.
Claim 4
Dependent Claim
24 words
An arrangement as claimed in claim 2, characterized in that only high frequency luminance signal portions are applied to the further combined vertical-temporal filter.
Claim 5
Dependent Claim
94 words
An arrangement as claimed in claim 3, characterized in that the further combined vertical-temporal filter comprises: first circuit means, in which said high frequency luminance signal portions are subjected to a vertical-temporal filtering operation, which is the inverse of the operation of the combined vertical-temporal filter of one of said color difference signals, and second circuit means, in which output signals of the first circuit means are subjected to a vertical-temporal filtering operation which is the inverse of the operation of the combined vertical-temporal filter of the other one of said color difference signals.
Claim 6
Dependent Claim
105 words
An arrangement for decoding color television signals including a luminance signal and a modulated chrominance signal, comprising: a quadrature demodulator for converting said modulated chrominance signal into first and second color difference signals, a three-dimensional filter circuit coupled to receive said luminance signal, and a three-dimensional filter circuit coupled to receive said first and second color difference signals, characterized in that said three-dimensional filter circuit coupled to receive said first and second color difference signals filter circuit comprises first and second three-dimensional sub-filters being coupled to receive said first and second color difference signals, respectively, said first and second 3-dimensional sub-filters being mutually different dimensioned.
Claim 7
Dependent Claim
105 words
An arrangement for decoding color television signals including a luminance signal and a modulated chrominance signal, comprising: a quadrature demodulator for converting said modulated chrominance signal into first and second color difference signals, a three-dimensional filter circuit coupled to receive said luminance signal, and a three-dimensional filter circuit coupled to receive said first and second color difference signals, characterized in that said three-dimensional filter circuit coupled to receive said first and second color difference signals filter circuit comprises first and second three-dimensional sub-filters being coupled to receive said first and second color difference signals, respectively, said first and second 3-dimensional sub-filters being mutually different dimensioned.
Claim 8
Dependent Claim
32 words
An arrangement as claimed in claim 5, characterized in that said first and second 3-dimensional sub-filters are each constituted by a series arrangement of a combined vertical-temporal filter and a low-pass filter.
Claim 9
Dependent Claim
43 words
An arrangement as claimed in claim 6, characterized in that the passband of the combined vertical-temporal filter coupled to receive said first color difference signal is less than the passband of the combined vertical-temporal filter coupled to receive said second color difference signal.
Claim 10
Dependent Claim
46 words
An arrangement as claimed in any one of the claims 5-7, characterized in that said three-dimensional filter circuit coupled to receive said luminance signal comprises a combined luminance vertical-temporal filter and means for applying only high frequency luminance signal portions to said combined luminance vertical-temporal filter.
Claim 11
Dependent Claim
86 words
An arrangement as claimed in claim 8, characterized in that said combined luminance vertical-temporal filter comprises: first circuit means, in which said high frequency luminance signal portions are subjected to a vertical-temporal filtering operation, which is the inverse of the vertical-temporal filtering of one of said color difference signals, and second circuit means, in which output signals of the first circuit means are subjected to a vertical-temporal filtering operation which is the inverse of the vertical-temporal filtering of the other one of said color difference signals.
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) | 1993-08-06 | 1994-02-05 | 1994-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-06 | 1998-02-05 | 1998-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-06 | 2002-02-05 | 2002-08-07 | $7700.00 | Window Closed / Lapsed |