US3716795A
Expired / Lapsed
US
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Time comb generator
Assignee: Control Concepts Corp
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Filing: 1971-03-18
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Granted: 1973-02-13
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Expires: 1991-03-18
Abstract
Abstract A time comb generator for a television synchronizing generator having a series of three shift register dividers connected in cascade. A pulse train having a frequency of 14.318 MHz is fed to the first shift register which divides the frequency of the pulse train by ten. The divided signal is then fed to a second shift register which also divides by ten. The output of the second shift register is then fed to a third shift register which divides by six. The cascaded arrangement of shift registers are recycled each time 455 pulses have been fed thereto. This is twice the rate at which the horizontal lines are scanned in a television system. The first two shift registers have five stages and the last has three stages, each of which provide an output incrementally time spaced from the other at equal time intervals, that is, e.g., 10 different outputs can be derived from the first shift register, one being spaced from the next by approximately 70 nanoseconds. The second shift register provides ten equally spaced output signals each approximately 700 ns apart. The third shift register provides six equally spaced output signals each approximately 7000 ns apart. The outputs from the various stages are then selectively combined in a desired manner to position the leading and trailing edges of the various component signals in a television sync signal.
Inventors
- 👤 B Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:06
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/04; H04N5/06; H03; H03K; H03K3/00; H03K3/78
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
245 words
A time comb generator in a television synchronizing generator comprising means for generating a high frequency pulse waveform, a first shift register having five stages of flip-flops, means for inverting and feeding back the output of said first register to the input of said first register to provide a total cycle of 10 counts, means for driving said first shift register by said high frequency pulse waveform, a second shift register having five stages of flip-flops, means for inverting and feeding back the output of said second register to the input of said second register to provide a total cycle of 10 counts, means for driving said second shift register by the simultaneous occurrence of each tenth count of said first shift register and a pulse from said high frequency pulse waveform, a third shift register having three stages of flip-flops, means for inverting and feeding back the output of said third shift register to the input of said third register to provide a total cycle of six counts, means for driving said third shift register by the simultaneous occurrence of the tenth count of said first shift register, the tenth count of said second shift register and a pulse from said high frequeNcy waveform, means for resetting said shift registers, and means for selectively deriving the pulse outputs from the stages of the shift registers, said pulses being utilized to define the leading and trailing edges of the components of a television synchronization signal.
Claim 2
Dependent Claim
245 words
A time comb generator in a television synchronizing generator comprising means for generating a high frequency pulse waveform, a first shift register having five stages of flip-flops, means for inverting and feeding back the output of said first register to the input of said first register to provide a total cycle of 10 counts, means for driving said first shift register by said high frequency pulse waveform, a second shift register having five stages of flip-flops, means for inverting and feeding back the output of said second register to the input of said second register to provide a total cycle of 10 counts, means for driving said second shift register by the simultaneous occurrence of each tenth count of said first shift register and a pulse from said high frequency pulse waveform, a third shift register having three stages of flip-flops, means for inverting and feeding back the output of said third shift register to the input of said third register to provide a total cycle of six counts, means for driving said third shift register by the simultaneous occurrence of the tenth count of said first shift register, the tenth count of said second shift register and a pulse from said high frequeNcy waveform, means for resetting said shift registers, and means for selectively deriving the pulse outputs from the stages of the shift registers, said pulses being utilized to define the leading and trailing edges of the components of a television synchronization signal.
Claim 3
Dependent Claim
245 words
A time comb generator in a television synchronizing generator comprising means for generating a high frequency pulse waveform, a first shift register having five stages of flip-flops, means for inverting and feeding back the output of said first register to the input of said first register to provide a total cycle of 10 counts, means for driving said first shift register by said high frequency pulse waveform, a second shift register having five stages of flip-flops, means for inverting and feeding back the output of said second register to the input of said second register to provide a total cycle of 10 counts, means for driving said second shift register by the simultaneous occurrence of each tenth count of said first shift register and a pulse from said high frequency pulse waveform, a third shift register having three stages of flip-flops, means for inverting and feeding back the output of said third shift register to the input of said third register to provide a total cycle of six counts, means for driving said third shift register by the simultaneous occurrence of the tenth count of said first shift register, the tenth count of said second shift register and a pulse from said high frequeNcy waveform, means for resetting said shift registers, and means for selectively deriving the pulse outputs from the stages of the shift registers, said pulses being utilized to define the leading and trailing edges of the components of a television synchronization signal.
Claim 4
Dependent Claim
245 words
A time comb generator in a television synchronizing generator comprising means for generating a high frequency pulse waveform, a first shift register having five stages of flip-flops, means for inverting and feeding back the output of said first register to the input of said first register to provide a total cycle of 10 counts, means for driving said first shift register by said high frequency pulse waveform, a second shift register having five stages of flip-flops, means for inverting and feeding back the output of said second register to the input of said second register to provide a total cycle of 10 counts, means for driving said second shift register by the simultaneous occurrence of each tenth count of said first shift register and a pulse from said high frequency pulse waveform, a third shift register having three stages of flip-flops, means for inverting and feeding back the output of said third shift register to the input of said third register to provide a total cycle of six counts, means for driving said third shift register by the simultaneous occurrence of the tenth count of said first shift register, the tenth count of said second shift register and a pulse from said high frequeNcy waveform, means for resetting said shift registers, and means for selectively deriving the pulse outputs from the stages of the shift registers, said pulses being utilized to define the leading and trailing edges of the components of a television synchronization signal.
Claim 5
Dependent Claim
17 words
The time comb generator of claim 1 wherein said pulse waveform has a frequency of 14.318 mHz.
Claim 6
Dependent Claim
32 words
The time comb generator of claim 2 wherein said means for resetting said shift registers comprises an ''''and'''' gate having its input terminals selectively connected to one output of each shift register.
References Cited (Backward Citations)
US3002151A
Cited
US2972718A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |