Electronic editing apparatus

Claim 2

An edit control system comprising: a playback-side video tape recorder loaded thereon a playback-side video tape with video information including time code signals and color subcarrier which has a phase variation cycle to return an initial phase through a given number of frames; a recording-side video tape recorder loaded thereon a recording-side video tape recorded thereon video information including time code signals and color subcarrier which has a phase variation cycle corresponding to that recorded on said playback-side video tape; means for detecting a first color subcarrier phase in said video information recorded on said playback-side video tape, relative to said time code signals reproduced from said playback-side video tape recorder; means for detecting a second color subcarrier phase in said video information recorded on said recording-side video tape, relative to said time code signals reproduced from said recording-side video tape recorder; means for setting first and second editing points on said playback-side and recording-side video tapes; and means for deriving said first and second subcarrier phases based on said time code signals reproduced at said first and second editing points, comparing derived first and second subcarrier phases at said first and second editing points, and shifting one of said first and second editing points so that said first and second subcarrier phases at said first and second editing points match.

Claim 3

An edit control system as set forth in claim l, which further comprises means for producing a reference synchronizing signal based on which a reference color frame phase can be derived, and said playback-side and recording-side video tape recorder periodically reproduce first and second color framing pulses at given timings relative to picture frames on said playback-side and recording-side video tape, which first and second color framing pulses are locked with said reference synchronizing signal at timings independent of each other.

Claim 4

An edit control system as set forth in claim 2, wherein said playback-side video tape recorder is responsive to locking of said first color framing pulse with said reference synchronizing signal to output a first locking condition indicative signal, and said recording-side video tape recorder is responsive to locking of said second color framing pulse with said reference synchronizing signal to output a second locking condition indicative signal, and said means for detecting a first color subcarrier phase and means for detecting a second color subcarrier phase are responsive to said first and second locking condition indicative signals for deriving said first and second color subcarrier pahses relative to said first and second time code signals.

Claim 5

An edit control system as set forth in claim 3, wherein said means for detecting said first color subcarrier phase is responsive to said first locking condition indicative signal for detecting first phase difference of said first color framing pulses relative to said reference color frame phase at the timing of said first time code signal, and detects second phase difference between said first color framing pulse and a first color frame phase representative of said first subcarrier phase in said video information recorded on said playback-side video tape recorder, and whereby detecting said color frame phase relative to said first time code signal based on said first and second phase differences.

Claim 6

An edit control system as set forth in claim 3, wherein said means for detecting said second color subcarrier phase is responsive to said second locking condition indicative signal for detecting first phase difference of said second color framing pulses relative to said reference color frame phase at the timing of said second time code signal, and detects second phase difference between said second color framing pulse and a second color frame phase representative of said second subcarrier phase in said video information recorded on said recording-side video tape recorder, and whereby detecting said color frame phase relative to said second time code signal based on said second and second phase differences.

Claim 7

An edit control system as set forth in claim 4, wherein said means for detecting said second color subcarrier phase is responsive to said second locking condition indicative signal for detecting first phase difference of said second color framing pulses relative to said reference color frame phase at the timing of said second time code signal, and detects second phase difference between said second color framing pulse and a color frame phase in said video information recorded on said recording-side video tape recorder, and whereby detecting said color frame phase relative to said second time code signal based on said second and second phase differences.

Claim 8

An edit control system as set forth in claim 6, wherein said playback-side and recording-side video tape recorders are driven in test modes in advance of editing operation, and said said means for detecting a first color subcarrier phase and means for detecting a second color subcarrier phase are active during said test mode operation for detecting said first and second color frame phases relative to said first and second time code signals.

Claim 9

An electronic edit control system comprising: a playback-side video tape recorder loaded thereon a playback-side video tape with video information including a first color framing pulse, a first time code signal and a first color subcarrier which has a phase variation cycle to return an initial phase through a given number of frames; a recording-side video tape recorder loaded thereon a recording-side video tape recorded thereon video information including a second color framing pulse, a second time code signals and a second color subcarrier which has a phase variation cycle corresponding to that recorded on said playback-side video tape; and a microprocessor-based edit control apparatus including first means for operating said playback-side and recording-side video tape recorders in a test mode, second means, active during said test mode operation, for detecting a first color subcarrier phase in said video information recorded on said playback-side video tape, relative to said time code signals reproduced from said playback-side video tape recorder, third means, also active during said test mode operation, for detecting a second color subcarrier phase in said video information recorded on said recording-side video tape, relative to said time code signals reproduced from said recording-side video tape recorder; fourth means, manually operable, for setting first and second editing points on said playback-side and recording-side video tapes, and fifth means, active during an edit mode operation, for deriving said first and second subcarrier phases based on said time code signals reproduced at said first and second editing points, comparing derived first and second subcarrier phases at said first and second editing points, and shifting one of said first and second editing points so that said first and second subcarrier phases at said first and second editing points match.

Claim 10

An electronic edit control system comprising: a playback-side video tape recorder loaded thereon a playback-side video tape with video information including a first color framing pulse, a first time code signal and a first color subcarrier which has a phase variation cycle to return an initial phase through a given number of frames; a recording-side video tape recorder loaded thereon a recording-side video tape recorded thereon video information including a second color framing pulse, a second time code signals and a second color subcarrier which has a phase variation cycle corresponding to that recorded on said playback-side video tape; and a microprocessor-based edit control apparatus including first means for operating said playback-side and recording-side video tape recorders in a test mode, second means, active during said test mode operation, for detecting a first color subcarrier phase in said video information recorded on said playback-side video tape, relative to said time code signals reproduced from said playback-side video tape recorder, third means, also active during said test mode operation, for detecting a second color subcarrier phase in said video information recorded on said recording-side video tape, relative to said time code signals reproduced from said recording-side video tape recorder; fourth means, manually operable, for setting first and second editing points on said playback-side and recording-side video tapes, and fifth means, active during an edit mode operation, for deriving said first and second subcarrier phases based on said time code signals reproduced at said first and second editing points, comparing derived first and second subcarrier phases at said first and second editing points, and shifting one of said first and second editing points so that said first and second subcarrier phases at said first and second editing points match.

Claim 11

An electronic edit control system as set forth in claim 8, which further comprises means for producing a reference synchronizing signal based on which a reference color frame phase can be derived, said playback-side and recording side video tape recorders are detective of locking of first and second color framing pulses with said reference synchronizing signal at timings independent of each other to produce first and second locking condition indicative signals.

Claim 12

l0. An electronic edit control system as set forth in claim 9, wherein said second and third means are responsive to said first and second locking condition indicative signals for deriving said first and second color subcarrier pahses relative to said first and second time code signals.

Claim 13

An electronic edit control system as set forth in claim l0, wherein said second means is responsive to said first locking condition indicative signal for arithmetically deriving a first value indicative of a first phase difference of said first color framing pulses relative to said reference color frame phase at the timing of said first time code signal, and a second value representive of second phase difference between said first color framing pulse and a first color frame phase representative of said first subcarrier phase in said video information recorded on said playback-side video tape recorder, and whereby deriving a third value indicative of a thid phase difference of said first color frame phase relative to said first time code signal based on said first and second values.

Claim 14

An electronic edit control system as set forth in claim ll, wherein said third means is responsive to said second locking condition indicative signal for arithmetically deriving a fourth value indicative of a fourth phase difference of said second color framing pulses relative to said reference color frame phase at the timing of said second time code signal, and a fifth value representive of fifth phase difference between said second color framing pulse and a second color frame phase representative of said second subcarrier phase in said video information recorded on said recording-side video tape recorder, and whereby deriving a sixth value indicative of a sixth phase difference of said second color frame phase relative to said second time code signal based on said fourth and fifth values.

Claim 15

An electronic edit control system as set forth in claim l2, wherein said fifth mmeans of said edit control apparatus derives said first and second subcarrier phases at said first and second edit points based on said first and second time code signals at said first and second edit points and said third and sixth values.

Claim 16

An edit control system comprising: a playback-side video tape recorder loaded thereon a playback-side video tape with color video information to be reproduced with control signals containing periodically superimposed color framing data and color subcarrier which has a phase variation cycle to return an initial phase through a given number of frames; a recording-side video tape recorder loaded thereon a recording-side video tape recorded thereon video information to be reproduced with control signals containing periodically superimposed color framing data and color subcarrier which has a phase variation cycle corresponding to that recorded on said playback-side video tape; means for detecting a first color subcarrier phase in said video information recorded on said playback-side video tape, relative to said time code signals reproduced from said playback-side video tape recorder; means for detecting a second color subcarrier phase in said video information recorded on said recording-side video tape, relative to said time code signals reproduced from said recording-side video tape recorder; means for setting first and second editing points on said playback-side and recording-side video tapes; and means for deriving said first and second subcarrier phases based on said color framing data corresponding to at said first and second editing points, comparing derived first and second subcarrier phases at said first and second editing points, and shifting one of said first and second editing points so that said first and second subcarrier phases at said first and second editing points match.

Claim 17

An edit control system comprising: a playback-side video tape recorder loaded thereon a playback-side video tape with color video information to be reproduced with control signals containing periodically superimposed color framing data and color subcarrier which has a phase variation cycle to return an initial phase through a given number of frames; a recording-side video tape recorder loaded thereon a recording-side video tape recorded thereon video information to be reproduced with control signals containing periodically superimposed color framing data and color subcarrier which has a phase variation cycle corresponding to that recorded on said playback-side video tape; means for detecting a first color subcarrier phase in said video information recorded on said playback-side video tape, relative to said time code signals reproduced from said playback-side video tape recorder; means for detecting a second color subcarrier phase in said video information recorded on said recording-side video tape, relative to said time code signals reproduced from said recording-side video tape recorder; means for setting first and second editing points on said playback-side and recording-side video tapes; and means for deriving said first and second subcarrier phases based on said color framing data corresponding to at said first and second editing points, comparing derived first and second subcarrier phases at said first and second editing points, and shifting one of said first and second editing points so that said first and second subcarrier phases at said first and second editing points match.