Method and apparatus for reproducing independently recorded mult

Details Method and apparatus for reproducing independently recorded mult Method and apparatus for reproducing independently recorded mult

1992-07-28

1995-01-31

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Record editing

360 27, 360 51, G11B 502, G11B 509, H04N 578

Patent

active

053863232

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.

REFERENCES:
patent: 4772959 (1988-09-01), Amano et al.
patent: 4819088 (1989-04-01), Higurashi
patent: 4823207 (1989-04-01), Kobayashi et al.
"Design Considerations for the D-2 NTSC Composite DVTR" by K. Inagaki; ITEJ Technical Report vol. 11, No. 24, pp. 13-18 (Oct. 1987) (Partial English translation is attached).
"Helical-scan Digital Composite Video Cassette Recording System Using 19mm Magnetic Tape, Format D-2 (NTSC, PAL, PAL-M)"; Draft International Standard: Nov. 18, 1991; pp. 97-102, 113-134.

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