Apparatus for recording and/or reproducing digital video and audio signals operable in an after-recording mode

Digital video tape recording apparatus for recording digital video and digital audio signals in separate portions of a record track, comprising:

• digital video processing means for processing the digital video signal supplied thereto for recording and for reproduction, said digital video processing means exhibiting an inherent time delay t.sub.1 ;
• digital audio processing means for processing the digital audio signal associated with said digital video signal and supplied thereto for recording and for reproduction, said digital audio processing means exhibiting an inherent time delay t.sub.11, where t.sub.1 >t.sub.11 ;
• delay means for delaying the digital audio signal that is reproduced by an amount of delay so that during a reproduction operation, the reproduced digital video and digital audio signals are recovered in synchronism;
• supplying means operable in an after-recording mode for supplying the digital video signal to said digital video processing means, for recording the same in said after-recording mode substantially immediately after the digital audio signal associated with the supplied digital video signal is reproduced and recovered, the recording of the digital video signal in said after-recording mode being carried out without re-recording the digital audio signal;
• delay adjustment means for increasing the amount of delay of said delay means by an amount sufficient to match a cumulative inherent delay in the supply, processing, after-recording, and reproduction of said digital video signal such that the associated digital audio signal and the digital video signal recorded in said after-recording mode are reproduced in synchronism;
• and
• wherein said digital video processing means includes means for recording an ID signal representing said after-recording mode and means for detecting said ID signal when the after-recorded digital video signal is reproduced;
• and said delay adjustment means comprises means responsive to the detected ID signal to control said delay adjustment means.

Digital video tape recording apparatus for recording and reproducing digital video and digital audio signals in separate portions of at least one common record track and operable in an after-recording mode to record a digital audio signal that is associated with a previously recorded digital video signal in separate portions of different record tracks without re-recording the digital video signal, said apparatus comprising:

• digital video processing means for processing a digital video signal reproduced from a record track, said digital video processing means exhibiting an inherent time delay t.sub.2 ;
• digital audio processing means for processing a digital audio signal reproduced from a record track, said digital audio processing means exhibiting an inherent time delay t.sub.21 where t.sub.21 <t.sub.2 ;
• delay means for delaying the reproduced digital audio signal by an amount of delay substantially equal to t.sub.2 -t.sub.21 so that the reproduced digital video and digital audio signals are recovered in synchronism;
• and
• delay adjustment means operable during the reproduction of the digital audio signal that had been recorded in said after-recording mode to adjust the amount of delay of said delay means to a minimal amount, said delay adjustment means comprising bypass means for bypassing said delay means when the digital audio signal that had been recorded in said after-recording mode is reproduced from a track which differs from the track from which the associated digital video signal is reproduced.

Digital video tape recording apparatus for recording and reproducing digital video and digital audio signals in separate portions of at least one common record track and operable in an after-recording mode to record a digital video signal that is associated with a previously recorded digital audio signal in record tracks that differ from the record tracks in which said associated digital audio signal is recorded without re-recording the digital audio signal, said apparatus comprising:

• digital video processing means for processing a digital video signal reproduced from a record track, said digital video processing means exhibiting an inherent time delay t.sub.2 ;
• digital audio processing means for processing a digital audio signal reproduced from a record track, said digital audio processing means exhibiting an inherent time delay t.sub.21, where t.sub.21 <t.sub.2 ;
• variable delay means for delaying the reproduced digital audio signal by an amount of delay substantially equal to t.sub.2 -t.sub.21 so that when the digital video and digital audio signals are recorded concurrently, said digital video and digital audio signals are reproduced and recovered in synchronism;
• and
• delay adjustment means operable when said digital video signals had been after-recorded to increase the amount of delay of said delay means;
• and
• wherein the digital video signal is supplied for recording in said after-recording mode substantially immediately after the associated digital audio signal is reproduced, and is recorded after a time delay t.sub.1 ;
• and wherein said delay adjustment means is operable to increase the amount of delay of said delay means until it reaches t.sub.1 +(t.sub.2 -t.sub.21)+T, where T is the cumulative delay in supplying the digital video signal for recording in said after-recording mode and in reproducing the digital video signal recorded in said after-recording mode.

Digital video tape recording apparatus for recording and reproducing digital video and digital audio signals in separate portions of at least one common record track and operable in an after-recording mode to record a digital video signal that is associated with a previously recorded digital audio signal in record tracks that differ from the record tracks in which said associated digital audio signal is recorded without re-recording the digital audio signal, said apparatus comprising:

• digital video processing means for processing a digital video signal reproduced from a record track, said digital video processing means exhibiting an inherent time delay t.sub.2 ;
• digital audio processing means for processing a digital audio signal reproduced from a record track, said digital audio processing means exhibiting an inherent time delay t.sub.21, where t.sub.21 <t.sub.2 ;
• variable delay means for delaying the reproduced digital audio signal by an amount of delay substantially equal to t.sub.2 -t.sub.21 so that when the digital video and digital audio signals are recorded concurrently, said digital video and digital audio signals are reproduced and recovered in synchronism;
• and
• delay adjustment means operable when said digital video signals had been after-recorded to increase the amount of delay of said delay means;
• and
• wherein the digital video signal recorded in said after-recording mode includes an ID signal representing the after-recording mode, said digital video processing means includes means for detecting said ID signal;
• and said delay adjustment means includes means responsive to the detected ID signal to increase the amount of delay of said delay means.