System for recording and/or reproducing an audio signal which ha

Details System for recording and/or reproducing an audio signal which ha System for recording and/or reproducing an audio signal which ha

1978-12-15

1981-01-20

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Recording for changing duration, frequency or redundant...

358145, 360 19, 360 32, H04N 576, H04N 704

Patent

active

042466156

ABSTRACT:
A composite video signal recording and reproducing system also records and reproduces an audio signal after their conversion into a digital signal. The recording system converts an input analog audio signal into a digital signal and generates a synchronizing signal corresponding to a synchronizing signal of the composite video signal. There is a time-axis compression of the converted digital signal so that they do not exist in the period corresponding to the synchronizing signal. A level-setter sets the level of the digital signal which has been compressed at a value which is lower than the white peak level of the composite video signal. A mixer mixes the level set digital signal and the generated synchronizing signal, to obtain a composite digital signal. The composite digital signal is supplied to the recording and/or reproducing apparatus and recorded on a recording medium. The level-setter sets the amplitude of the digital signal at a magnitude such that the overshoots and undershoots occurring as a result of the passage of the digital signal through a pre-emphasis circuit of the recording and/or reproducing apparatus will not be clipped by a clipping circuit of the recording and/or reproducing apparatus.

REFERENCES:
patent: 2550821 (1951-05-01), Kharbanda
patent: 2624797 (1953-01-01), Lawson et al.
patent: 3748381 (1973-07-01), Strobele et al.
patent: 3980815 (1976-09-01), Kaneko
patent: 4141039 (1979-02-01), Yamamoto
patent: 4156253 (1979-05-01), Steudel

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