Method of recording digital audio and video signals in the same

Details Method of recording digital audio and video signals in the same Method of recording digital audio and video signals in the same

1982-05-03

1985-10-15

Richardson, Robert L.

Dynamic magnetic information storage or retrieval

Record editing

360 32, 358343, H04N 5782

Patent

active

045478163

ABSTRACT:
The magnitude of time-compression of audio signals recorded following the recording of video signals in the end portion of the same oblique track on magnetic tape is so related to the bit rate of recording of the video signals, in the recording of digital signals encoded in binary transmission codes, that the minimum interval between successive level changes in the audio signals is greater than the minimum interval between successive level changes in the video signal. This has the advantage of reducing the error rate in the audio signals in order to facilitate processing of digital signals of the audio information and of the video information in common processing channels, the minimum interval between successive level changes in the digital audio signals is made an integral multiple, preferably the double, of the minimum interval between successive level changes in the video signals. It is also advantageous to use different binary transmission codes for audio and video signals, particularly with respect to whether or not a level transition is permitted in the middle of a bit cell. Preferably the digital audio signals are recorded in a transmission code in which level changes are permitted in the middle of a bit cell, and the digital video signals are recorded in a transmission code in which level changes are not permitted in the middle of a bit cell.

REFERENCES:
patent: 4295154 (1981-10-01), Hata et al.
patent: 4303950 (1981-12-01), Taniguchi
patent: 4353098 (1982-10-01), Heinz et al.

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