Signal recording and/or reproducing technique

Details Signal recording and/or reproducing technique Signal recording and/or reproducing technique

1981-10-29

1984-04-10

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358145, 360 191, H04N 704, H04N 576

Patent

active

044424612

ABSTRACT:
A video signal is recorded with the associated audio signal inserted as a PCM digital signal in the back porch portions of the horizontal blanking intervals. In order to prevent the video pre-emphasis that is used in high-density recording from degrading the PCM digital signal, the video signal and the PCM digital signal are provided with separate and independent degrees of pre-emphasis. Upon playback, the video signal and the PCM digital signal are provided with corresponding independent respective amounts for de-emphasis. In order to fit a sufficient number of bits into the blanking intervals to provide high quality audio, the back porch portion is first extended by replacing the standard horizontal synch pulses with narrow pulses, so that the following back porch portions are correspondingly elongated.

REFERENCES:
patent: 3335218 (1967-08-01), Johnson
patent: 4246615 (1981-01-01), Shiaishi et al.

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