US3781463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colour television circuit
Assignee: US Philips Corp
•
Filing: 1971-11-18
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Granted: 1973-12-25
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Expires: 1991-11-18
Abstract
Abstract A colour television system particularly intended for video recording in which two chrominance signals are transmitted linesequentially in a time-compressed form during the line blanking period, preferably during the back porch of the line synchronisation. To this end they must be slowly written in and quickly read out in a bucket-brigade delay line by means of write and read control signals. Two series-arranged bucket-brigade delay lines are provided at the receiver end, the first receiving the incoming signal and writing in and reading out this signal by means of write and read control signals. Said write and read control signals at the receiver end have the same frequencies as the read and write control signals, respectively, at the transmitter end. The output of the first bucket-brigade delay line is a direct output, but it is also connected to the input of the second bucket-brigade delay line to which a control signal is applied mainly during the line scan period, which control signal has the same frequency as the write control signal at the transmitter end. The luminance signal is processed, with the required delay, in parallel with the chrominance signal.
Inventors
- 👤 Den Bussche W Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:32
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/81; H04N11/00; H04N11/06; H04N11/20; H04N11/22
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
40 words
A circuit comprising means for transmitting a television luminance signal during the scan time of a line period, and means for time compressing and for transmitting at least one corresponding chrominance signal during the blanking time of said line period.
Claim 2
Dependent Claim
40 words
A circuit comprising means for transmitting a television luminance signal during the scan time of a line period, and means for time compressing and for transmitting at least one corresponding chrominance signal during the blanking time of said line period.
Claim 3
Dependent Claim
26 words
A circuit as claimed in claim 1 wherein said compressing and transmitting means transmits said chrominance signal during the back porch interval of said blanking time.
Claim 4
Dependent Claim
37 words
A circuit as claimed in claim 1 wherein said television signal comprises two chrominance signals and said compressing and transmitting means comprises means for transmitting said chrominance signals in the blanking times of alternate sequential line scans.
Claim 5
Dependent Claim
17 words
A circuit as claimed in claim 3 wherein said two chrominance signals comprise two color difference signals.
Claim 6
Dependent Claim
78 words
A circuit as claimed in claim 1 wherein said compressing and transmitting means comprises a memory adapted to receive said chrominance signal, and means for applying to said memory a write signal during said scan period for writing in said chrominance signal and for applying to said memory a read signal during the subsequent blanking period, the frequency of sAid read signal being higher than the frequency of said write signal by the amount of said time compression.
Claim 7
Dependent Claim
80 words
A circuit as claimed in claim 5 wherein said applying means comprises an oscillator, a frequency divider stage coupled to said oscillator and having a plurality of sequential divider stages, a switch coupled to said stages for obtaining said read and write signals and to said memory, means for deriving an alternating line frequency switching control signal from said divider and applying it to said switch, said control signal having a maximum pulse duration equal to said line blanking period.
Claim 8
Dependent Claim
62 words
A circuit as claimed in claim 6 wherein said television signal comprises two chrominance signals and further comprising means for line sequentially transmitting said two chrominance signals comprising a second switch having inputs adapted to receive said chrominance signals, an output coupled to said memory, and a control input means coupled to said divider for receiving a half line frequency control signal.
Claim 9
Dependent Claim
50 words
A circuit as claimed in claim 7 further comprising means for delaying said luminance signal one line period; a third switch having two inputs coupled to said delay means and said memory respectively, a control input coupled to said applying means, and an output means for providing an output signal.
Claim 10
Dependent Claim
26 words
A circuit as claimed in claim 8 further comprising a recording head coupled to said third switch output, and a recording medium disposed near said head.
Claim 11
Dependent Claim
19 words
A circuit as claimed in claim 9 further comprising modulating means coupled between said head and said third switch.
Claim 12
Dependent Claim
13 words
A circuit as claimed in claim 9 wherein said medium comprises magnetic tape.
Claim 13
Dependent Claim
15 words
A circuit as claimed in claim 9 wherein said medium comprises a video record disk.
Claim 14
Dependent Claim
86 words
A circuit for receiving a color television signal having a luminance signal occurring during a line scan period and a time compressed chrominance signal occurring during the line blanking period, said circuit comprising at least one memory adapted to receive said chrominance signal, and means for sequentially applying write and read control signals to said memory during said blanking and scan periods respectively, the frequency of said write signal being greater than the frequency of said read signal by an amount equal to said time compression.
Claim 15
Dependent Claim
86 words
A circuit for receiving a color television signal having a luminance signal occurring during a line scan period and a time compressed chrominance signal occurring during the line blanking period, said circuit comprising at least one memory adapted to receive said chrominance signal, and means for sequentially applying write and read control signals to said memory during said blanking and scan periods respectively, the frequency of said write signal being greater than the frequency of said read signal by an amount equal to said time compression.
Claim 16
Dependent Claim
80 words
A circuit as claimed in claim 13 wherein said applying means comprises an oscillator, a frequency divider stage coupled to said oscillator and having a plurality of sequential divider stages, a switch coupled to said stages for obtaining said read and write signals and to said memory, means for deriving an alternating line frequency switching control signal from said divider and applying it to said switch, said control signal having a maximum pulse duration equal to said line blanking period.
Claim 17
Dependent Claim
114 words
A circuit as claimed in claim 14 wherein said television signal has two line sequential chrominance signals, said receiver further comprising a second memory having an input coupled to the output of said first memory; a commutator having four input and two output terminals, two of said terminals being coupled to said first memory output, the remaining two input terminals being coupled to the second memory output; means coupled to said divider for providing a one half line frequency switching signal to said commutator, means for applying to said second memory a control signal other than during said blanking period comprising a switching means coupled to said divider stages and to said second memory.
Claim 18
Dependent Claim
40 words
A circuit as claimed in claim 15 further comprising a line frequency switch having an input adapted to receive said television signal, a first output coupled to said first memory input, and a second output for providing said luminance signal.
Claim 19
Dependent Claim
25 words
A circuit as claimed in claim 16 further comprising a playback head disposed near a recording medium and coupled to said last recited switch input.
Claim 20
Dependent Claim
20 words
A circuit as claimed in claim 17 further comprising a demodulator Coupled between said head and said last recited switch.
Claim 21
Dependent Claim
13 words
A circuit as claimed in claim 17 wherein said medium comprises magnetic tape.
Claim 22
Dependent Claim
15 words
A circuit as claimed in claim 17 wherein said medium comprises a video record disk.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |