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US3887941A
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US
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Synchronizing pulse processor for a video tape recorder
Assignee: INTERNATIONAL VIDEO CORP
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Filing: 1972-09-01
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Granted: 1975-06-03
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Expires: 1992-09-01
Abstract
Abstract A technique for deriving timing pulses and reference signals for video processing circuits and tape driving mechanisms of a video tape recorder (VTR). The output signal of the VTR must have horizontal and vertical components having a predetermined relationship to the input synchronizing signals. A clock pulse is generated at a multiple of the horizontal rate of the input synchronizing signals through the medium of a phase-lock loop. A series of dividers is fed at the clock-pulse rate and appropriately reset by the vertical component of the input synchronizing signal such that output synchronizing signals are available which are advanced in time by an integral number of half-line intervals (by one or two lines in the preferred embodiment) with respect to the input synchronizing signal. These signals are further conditioned by a digital delay system including a counter fed at the clock-pulse rate such that the final output synchronizing signals may be adjusted relative to the input in increments correpsonding to the clock-pulse interval. The output signal of the VTR will be synchronous with these final output synchronizing signals since they form the basic servo and time-base-corrector references during playback. In editing operations it is necessary to obtain a particular timing relationship between the signal about to be recorded and the playback signal; this relationship will change as the result of environmental changes and mechanical differences between VTRs. The required advance or delay of the timing references is determined automatically (or manually) during the EDIT PLAY mode, and the count corresponding to the required digitally determined delay is stored in latches at the time of switching to the EDIT RECORD mode. Thus the timing established during EDIT PLAY is maintained by a digital memory function during EDIT RECORD.
Inventors
- 👤 Bert H Dann
- 👤 Nikola Vidovic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:38
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/02; G11B27/022; G11B27/029; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H04N5/932; H04N5/95; Y; Y10; Y10S; Y10S331/00; Y10S331/02
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
248 words
A synchronizing pulse processor for a video tape recorder wherein synchronizing pulses at the television field rate, frame rate and horizontal line rate are processed, said synchronizing pulse processor normally receiving reference horizontal pulses and reference field pulses normally related to said reference horizontal pulses, the combination comprising means receiving said reference horizontal pulses for generating clock pulses having a frequency at a multiple of the reference horizontal pulse frequency, means receiving said reference field pulses and said clock pulses for generating at least two field rate pulse outputs, said field rate pulse outputs spaced in time by an integral number of clock pulse intervals, one of said field rate pulse outputs synchronized to said clock pulses and said reference field pulses as a reference synchronous field output, the other of said field rate pulse outputs occurring before said reference field pulses as an advanced field pulse output, stable self-contained oscillator means for generating said clock pulses, and means for detecting the presence of said reference horizontal pulses to apply the multiple of said reference horizontal pulses as said clock pulses when said reference horizontal pulses are present and for simultaneously applying the pulses from said oscillator as said clock pulses to said field rate pulse generating means and rEmoving said reference field pulses from said means for generating field rate pulses when said reference horizontal pulses are absent, whereby the change of clock pulse sources has substantially no effect on the substantially lower frequency field pulse rate.
Claim 2
Dependent Claim
248 words
A synchronizing pulse processor for a video tape recorder wherein synchronizing pulses at the television field rate, frame rate and horizontal line rate are processed, said synchronizing pulse processor normally receiving reference horizontal pulses and reference field pulses normally related to said reference horizontal pulses, the combination comprising means receiving said reference horizontal pulses for generating clock pulses having a frequency at a multiple of the reference horizontal pulse frequency, means receiving said reference field pulses and said clock pulses for generating at least two field rate pulse outputs, said field rate pulse outputs spaced in time by an integral number of clock pulse intervals, one of said field rate pulse outputs synchronized to said clock pulses and said reference field pulses as a reference synchronous field output, the other of said field rate pulse outputs occurring before said reference field pulses as an advanced field pulse output, stable self-contained oscillator means for generating said clock pulses, and means for detecting the presence of said reference horizontal pulses to apply the multiple of said reference horizontal pulses as said clock pulses when said reference horizontal pulses are present and for simultaneously applying the pulses from said oscillator as said clock pulses to said field rate pulse generating means and rEmoving said reference field pulses from said means for generating field rate pulses when said reference horizontal pulses are absent, whereby the change of clock pulse sources has substantially no effect on the substantially lower frequency field pulse rate.
Claim 3
Dependent Claim
248 words
A synchronizing pulse processor for a video tape recorder wherein synchronizing pulses at the television field rate, frame rate and horizontal line rate are processed, said synchronizing pulse processor normally receiving reference horizontal pulses and reference field pulses normally related to said reference horizontal pulses, the combination comprising means receiving said reference horizontal pulses for generating clock pulses having a frequency at a multiple of the reference horizontal pulse frequency, means receiving said reference field pulses and said clock pulses for generating at least two field rate pulse outputs, said field rate pulse outputs spaced in time by an integral number of clock pulse intervals, one of said field rate pulse outputs synchronized to said clock pulses and said reference field pulses as a reference synchronous field output, the other of said field rate pulse outputs occurring before said reference field pulses as an advanced field pulse output, stable self-contained oscillator means for generating said clock pulses, and means for detecting the presence of said reference horizontal pulses to apply the multiple of said reference horizontal pulses as said clock pulses when said reference horizontal pulses are present and for simultaneously applying the pulses from said oscillator as said clock pulses to said field rate pulse generating means and rEmoving said reference field pulses from said means for generating field rate pulses when said reference horizontal pulses are absent, whereby the change of clock pulse sources has substantially no effect on the substantially lower frequency field pulse rate.
Claim 4
Dependent Claim
248 words
A synchronizing pulse processor for a video tape recorder wherein synchronizing pulses at the television field rate, frame rate and horizontal line rate are processed, said synchronizing pulse processor normally receiving reference horizontal pulses and reference field pulses normally related to said reference horizontal pulses, the combination comprising means receiving said reference horizontal pulses for generating clock pulses having a frequency at a multiple of the reference horizontal pulse frequency, means receiving said reference field pulses and said clock pulses for generating at least two field rate pulse outputs, said field rate pulse outputs spaced in time by an integral number of clock pulse intervals, one of said field rate pulse outputs synchronized to said clock pulses and said reference field pulses as a reference synchronous field output, the other of said field rate pulse outputs occurring before said reference field pulses as an advanced field pulse output, stable self-contained oscillator means for generating said clock pulses, and means for detecting the presence of said reference horizontal pulses to apply the multiple of said reference horizontal pulses as said clock pulses when said reference horizontal pulses are present and for simultaneously applying the pulses from said oscillator as said clock pulses to said field rate pulse generating means and rEmoving said reference field pulses from said means for generating field rate pulses when said reference horizontal pulses are absent, whereby the change of clock pulse sources has substantially no effect on the substantially lower frequency field pulse rate.
Claim 5
Dependent Claim
189 words
A synchronizing pulse processor for a video tape recorder wherein synchronizing pulses at the television field rate, frame rate and horizontal line rate are processed, said synchronizing pulse processor normally receiving reference horizontal pulses and reference field pulses normally related to said reference horizontal pulses, the combination comprising means receiving said reference horizontal pulses for generating clock pulses having a frequency at a multiple of the reference horizontal pulse frequency, said means including a phase locked loop receiving said reference horizontal pulses as a reference signal, and means receiving said reference field pulses and said clock pulses for generating at least two field rate pulse outputs, said field rate pulse generating means including divide counter means receiving said reference field pulses as a reset to initially phase said counter means, said field rate pulse outputs spaced in time by an integral number of clock pulse intervals, one of said field rate pulse outputs synchronized to said clock pulses and said reference field pulses as a reference synchronous field output, the other of said field rate pulse outputs occurring before said reference field pulses as an advanced field pulse output.
Claim 6
Dependent Claim
189 words
A synchronizing pulse processor for a video tape recorder wherein synchronizing pulses at the television field rate, frame rate and horizontal line rate are processed, said synchronizing pulse processor normally receiving reference horizontal pulses and reference field pulses normally related to said reference horizontal pulses, the combination comprising means receiving said reference horizontal pulses for generating clock pulses having a frequency at a multiple of the reference horizontal pulse frequency, said means including a phase locked loop receiving said reference horizontal pulses as a reference signal, and means receiving said reference field pulses and said clock pulses for generating at least two field rate pulse outputs, said field rate pulse generating means including divide counter means receiving said reference field pulses as a reset to initially phase said counter means, said field rate pulse outputs spaced in time by an integral number of clock pulse intervals, one of said field rate pulse outputs synchronized to said clock pulses and said reference field pulses as a reference synchronous field output, the other of said field rate pulse outputs occurring before said reference field pulses as an advanced field pulse output.
Claim 7
Dependent Claim
219 words
A synchronizing pulse processor for a video tape recorder wherein synchronizing pulses at the television field rate, frame rate and horizontal line rate are processed, said synchronizing pulse processor normally receiving reference horizontal pulses and reference field pulses normally related to said reference horizontal pulses, the combination comprising means receiving said reference horizontal pulses for generating clock pulses having a frequency at a multiple of the reference horizontal pulse frequency, means receiving said reference field pulses and said clock pulses for generating at least two field rate pulse outputs, said field rate pulse outputs spaced in time by an integral number of clock pulse intervals, one of said field rate pulse outputs synchronized to said clock pulses and said reference field pulses as a reference synchronous field output, the other of said field rate pulse outputs occurring before said reference field pulses as an advanced field pulse output, means receiving said clock pulses for providing clock derived horizontal pulses at the horizontal line frequency rate, means receiving said clock derived horizontal pulses and said advanced field output pulses for providing a pulse in advance of each frame, and means receiving said pulse in advance of each frame and said reference synchronous field pulses for providing a reference frame pulse output in synchronism with said reference synchronous field output pulses.
Claim 8
Dependent Claim
219 words
A synchronizing pulse processor for a video tape recorder wherein synchronizing pulses at the television field rate, frame rate and horizontal line rate are processed, said synchronizing pulse processor normally receiving reference horizontal pulses and reference field pulses normally related to said reference horizontal pulses, the combination comprising means receiving said reference horizontal pulses for generating clock pulses having a frequency at a multiple of the reference horizontal pulse frequency, means receiving said reference field pulses and said clock pulses for generating at least two field rate pulse outputs, said field rate pulse outputs spaced in time by an integral number of clock pulse intervals, one of said field rate pulse outputs synchronized to said clock pulses and said reference field pulses as a reference synchronous field output, the other of said field rate pulse outputs occurring before said reference field pulses as an advanced field pulse output, means receiving said clock pulses for providing clock derived horizontal pulses at the horizontal line frequency rate, means receiving said clock derived horizontal pulses and said advanced field output pulses for providing a pulse in advance of each frame, and means receiving said pulse in advance of each frame and said reference synchronous field pulses for providing a reference frame pulse output in synchronism with said reference synchronous field output pulses.
Claim 9
Dependent Claim
25 words
The combination of claim 3 further comprising means for providing reference horizontal pulses derived from said clock pulses and phased by said reference frame pulses.
Claim 10
Dependent Claim
29 words
The combination of claim 4 further comprising means for providing a further reference field pulse output derived from said reference horizontal pulses and phased by said reference frame pulses.
Claim 11
Dependent Claim
36 words
The combination of claim 5 wherein said means for providing a further reference field pulse output further provides at least one time staggered reference field output selectively time displaced from said further reference field pulse output.
Claim 12
Dependent Claim
47 words
The combination of claim 3 further comprising means for providing a reference signal in synchronism with said clock pulses and said reference frame pulses, the frequency of said reference signal being an integral multiple of the frame rate in both 25 Hz and 30 Hz television systems.
Claim 13
Dependent Claim
175 words
A synchronizing pulse processor for a video tape recoRder wherein synchronizing pulses at the television field rate, frame rate and horizontal line rate are processed, said synchronizing pulse processor normally receiving reference horizontal pulses and reference field pulses normally related to said reference horizontal pulses, the combination comprising means receiving said reference horizontal pulses for genrating clock pulses having a frequency at a multiple of the reference horizontal pulse frequency, means receiving said reference field pulses and said clock pulses for generating at least two field rate pulse outputs, said field rate pulse outputs spaced in time by an integral number of clock pulse intervals, one of said field rate pulse outputs synchronized to said clock pulses and said reference field pulses as a reference synchronous field output, the other of said field rate pulse outputs occurring before said reference field pulses as an advanced field pulse output, and delay means receiving said advanced field pulse output for selectively delaying said advanced field pulses by time increments equal to the period of said clock pulses.
Claim 14
Dependent Claim
175 words
A synchronizing pulse processor for a video tape recoRder wherein synchronizing pulses at the television field rate, frame rate and horizontal line rate are processed, said synchronizing pulse processor normally receiving reference horizontal pulses and reference field pulses normally related to said reference horizontal pulses, the combination comprising means receiving said reference horizontal pulses for genrating clock pulses having a frequency at a multiple of the reference horizontal pulse frequency, means receiving said reference field pulses and said clock pulses for generating at least two field rate pulse outputs, said field rate pulse outputs spaced in time by an integral number of clock pulse intervals, one of said field rate pulse outputs synchronized to said clock pulses and said reference field pulses as a reference synchronous field output, the other of said field rate pulse outputs occurring before said reference field pulses as an advanced field pulse output, and delay means receiving said advanced field pulse output for selectively delaying said advanced field pulses by time increments equal to the period of said clock pulses.
Claim 15
Dependent Claim
91 words
The combination of claim 8 further comprising means receiving said clock pulses for providing clock derived horizontal pulses at the horizontal line frequency rate, means receiving said clock derived horizontal pulses and said advanced field output pulses for providing a pulse in advance of each frame, and means receiving said pulse in advance of each frame and said selectively delayed advanced field output pulses for providing a conditioned frame reference pulse output selectively advanced or delayed in increments of said clock pulse period with reference to said reference field output pulses.
Claim 16
Dependent Claim
29 words
The combination of claim 9 further comprising means for providing advanced or delayed reference horizontal pulses derived from said clock pulses and phased by said conditioned frame reference pulses.
Claim 17
Dependent Claim
31 words
The combination of claim 10 further comprising means for providing a further reference field pulse output derived from said advanced reference horizontal pulses and phased by said conditioned frame reference pulses.
Claim 18
Dependent Claim
28 words
The combination of claim 11 wherein said means further provides at least one time staggered reference field output selectively time displaced from said further reference field pulse output.
Claim 19
Dependent Claim
48 words
The combination of claim 9 further comprising means for providing a reference signal in synchronism with said clock pulses and said conditioned frame reference pulses, the frequency of said reference signal being an integral multiple of the frame rate in both 25 Hz and 30 Hz television systems.
Claim 20
Dependent Claim
40 words
The combination of claim 8 wherein said delay means comprises controllable delay means receiving said advanced field pulse for providing a delayed advanced field pulse in response thereto, and means for controlling the delay time of said controllable delay means.
Claim 21
Dependent Claim
27 words
The combination of claim 14 wherein said delay means further comprises means for storing a clock pulse count representing the delay time of said controllable delay means.
Claim 22
Dependent Claim
73 words
The combination of claim 8 wherein said delay means comprises counter means enabled by said advanced field pulse and clocked at said clock pulse rate, means for storing a clock pulse count representing a desired delay time of said advanced field pulses, and means for providing a delayed advanced field pulse when the stored clock pulse count representing the delay time of said controllable delay means equals the count in said storage means.
Claim 23
Dependent Claim
353 words
A synchronizing pulse processor for a video tape recorder wherein synchronizing pulses at the television field rate, frame rate and horizontal line rate are processed, said synchronizing pulse processor normally receiving reference horizontal pulses and reference field pulses normally related to said reference horizontal pulses, the combination comprising means receiving sAid reference horizontal pulses for generating clock pulses having a frequency at a multiple of the reference horizontal pulse frequency, means receiving said reference field pulses and said clock pulses for generating at least two field rate pulse outputs, said field rate pulse outputs spaced in time by an integral number of clock pulse intervals, one of said field rate pulse outputs synchronized to said clock pulses and said reference field pulses as a reference synchronous field output, the other of said field rate pulse outputs occurring before said reference field pulses as an advanced field pulse output, controllable delay means receiving said advanced field pulse for providing a delayed advanced field pulse in response thereto, means for controlling the delay time of said controllable delay means, means receiving said clock pulses for providing clock derived horizontal pulses at the horizontal line frequency rate, means receiving said clock derived horizontal pulses and said advanced field output pulses for providing a pulse in advance of each frame, means receiving said pulse in advance of each frame and said selectively delayed advanced field output pulses for providing a conditioned frame reference pulse output selectively advanced or delayed in increments of said clock pulse period with reference to said reference field output pulses, means for providing reference synchronous horizontal pulses in synchronism with said reference synchronous field output pulses and said clock pulses and wherein said means for controlling the delay time of said controllable delay means comprises phase comparator means forming a portion of a closed loop, including the head-to-tape interface of said videotape recorder, receiving the off-tape horizontal sync pulses advanced in time by the combined record and playback delays of said videotape recorder and said reference synchronous horizontal pulses, for providing a delay control signal to minimize the phase difference of said pulses.
Claim 24
Dependent Claim
353 words
A synchronizing pulse processor for a video tape recorder wherein synchronizing pulses at the television field rate, frame rate and horizontal line rate are processed, said synchronizing pulse processor normally receiving reference horizontal pulses and reference field pulses normally related to said reference horizontal pulses, the combination comprising means receiving sAid reference horizontal pulses for generating clock pulses having a frequency at a multiple of the reference horizontal pulse frequency, means receiving said reference field pulses and said clock pulses for generating at least two field rate pulse outputs, said field rate pulse outputs spaced in time by an integral number of clock pulse intervals, one of said field rate pulse outputs synchronized to said clock pulses and said reference field pulses as a reference synchronous field output, the other of said field rate pulse outputs occurring before said reference field pulses as an advanced field pulse output, controllable delay means receiving said advanced field pulse for providing a delayed advanced field pulse in response thereto, means for controlling the delay time of said controllable delay means, means receiving said clock pulses for providing clock derived horizontal pulses at the horizontal line frequency rate, means receiving said clock derived horizontal pulses and said advanced field output pulses for providing a pulse in advance of each frame, means receiving said pulse in advance of each frame and said selectively delayed advanced field output pulses for providing a conditioned frame reference pulse output selectively advanced or delayed in increments of said clock pulse period with reference to said reference field output pulses, means for providing reference synchronous horizontal pulses in synchronism with said reference synchronous field output pulses and said clock pulses and wherein said means for controlling the delay time of said controllable delay means comprises phase comparator means forming a portion of a closed loop, including the head-to-tape interface of said videotape recorder, receiving the off-tape horizontal sync pulses advanced in time by the combined record and playback delays of said videotape recorder and said reference synchronous horizontal pulses, for providing a delay control signal to minimize the phase difference of said pulses.
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USPTO Annuity & Maintenance Windows
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| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |