Method and apparatus for reproducing independently recorded multi-channel digital audio signals simultaneously and in synchronization with video signals

U.S. Patent Number: 5386323

Abstract: Herein disclosed is a method and a system for recording and reproducing digital audio signals which enable simultaneous recording of video signals and audio signals without a synchronous relation, and simultaneous reproducing rerecorded audio signals if a part of channels of the audio signals are rerecorded, since a sample number of the audio signals for each the channel is equal to each other. On rerecording, a modulator 113 demodulates signals and the demodulated signals are separated into audio signals and sample number discriminating signals of the audio signals by a demultiplexor 114. A second counter changes dividing number on the basis of the sample number discriminating signals separated by the demultiplexor 114. A phase comparator 118 compares a phase of a cycle of the second counter 117 and a phase of a video frame cycle. Output signals are limited their band by a low-pass filter 119 and controls an oscillated frequency of a voltage controlled oscillator (VCO) 120. A second switch 106 selects output clock pulses of the VCO so that clock pulses used for A/D conversion are coincided with reproduced clock pulses. A fourth switch 110 selects output signals of a delaying means 115 so that sample number of recorded audio signals and sample number discriminating signals are coincided with reproduced audio signals.

Inventors: Ishiwata; Tetsuo (Osaka, JP), Yamaguchi; Susumu (Nishinomiya, JP)

Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP)

Application Number: 07/920,730

Issued: 1995-01-31

Expired: 2007-01-31

Classes: 386/104 ; 360/27; 360/51

Field of search: 360/19.1,8,27,51,18,13 369/49

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