Digital video signal reproducing apparatus with compression and

Details Digital video signal reproducing apparatus with compression and Digital video signal reproducing apparatus with compression and

1993-12-06

1995-02-21

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Record editing

360 65, 360 7304, 360 75, H04N 578

Patent

active

053921631

ABSTRACT:
For the purpose of data compression and expansion in the playback mode reproducing data including video data and audio data recorded on a magnetic tape, a relative speed signal is generated from a circuit on the basis of the moving speed of the magnetic tape and the rotation speed of a head drum, and the characteristic of the recorded data is controlled according to this relative speed signal. The tension of the magnetic tape is detected by a circuit, and the phase difference between the detected tape tension signal and a reel rotation speed command signal is detected by a circuit so as to control the tape tension according to the detected phase difference. When a target value of the drum rotation speed is changed, a drum drive signal is changed stepwise at a predetermined time interval, and the amount of delay of a drum rotation reference signal delayed according to a signal indicative of the rotation speed of a capstan is changed, so as to determine the range in which both the capstan rotation speed and the drum rotation speed can be changed. Interfaces are disposed between a system controller and a pitch controller so as to control the tone pitch of the audio signal according to the capstan rotation speed signal.

REFERENCES:
patent: 4463390 (1984-07-01), Koga
patent: 4688115 (1987-08-01), Takahashi et al.
patent: 4942487 (1990-07-01), Noguchi et al.
patent: 5045954 (1991-09-01), Oishi et al.
Inagaki, "D2NTSC composite digital VTR", Television Society Technical Report, vol. 11 No. 24 pp. 13-18, Oct. 1987.

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