Control circuit for use with a time-compression/time-expansion s

Details Control circuit for use with a time-compression/time-expansion s Control circuit for use with a time-compression/time-expansion s

1978-11-21

1980-06-03

Konick, Bernard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

360 8, 179 1555T, 365230, 360 32, 360 36, H04N 576

Patent

active

042064767

ABSTRACT:
A system for using a video signal recorder/playback device of the type normally adapted to record and/or reproduce video signals on a record medium, for recording and/or reproducing pulse signals on the record medium. The system includes time-compression/time-expansion apparatus for compressing the time domain of the pulse signals which are to be recorded and for expanding the time domain of the pulse signals which are reproduced. The time-compression/time-expansion apparatus includes a memory having addressable storage locations for temporarily storing pulse signals therein; write-in circuitry for writing pulse signals into the addressable storage locations at a first rate; read-out circuitry for reading out the stored pulse signals at a second rate, the write-in and read-out circuitry operating substantially independently of each other and at the same time; and an address generator for generating selected write-in and read-out addresses corresponding to the storage locations into which the pulse signals are written and from which the pulse signals are read. The apparatus also includes a detector for selectively detecting when all of the storage locations are filled or are empty, in which the detector includes an address comparator for comparing each bit in the write-in address code to each corresponding bit in the read-out address code to detect when all of the compared bits represent the same storage location. For time-compression, the read-out rate is faster than the write-in rate. For time-expansion, the read-out rate is slower than the write-in rate. The apparatus further includes a pulse generator coupled to the address comparator for generating a reset pulse when the address codes generated by the write-in and read-out address generators are equal.

REFERENCES:
patent: 3651276 (1972-03-01), Clark
patent: 3789137 (1974-01-01), Newell
patent: 3860952 (1975-01-01), Tallent
patent: 3900887 (1975-08-01), Soga
patent: 3962689 (1976-06-01), Brunson
patent: 4030129 (1977-06-01), Whitlock
"Pulse Code Modulation Recording System", by Iwamura et al, J. Audio Eng. Society, Sep. 1973, vol. 21, No. 7, pp. 535-541.
"PCM Recorder-A New Type of Audio Magnetic Tape Recorder", by Sato, J. Audio Eng. Society, Sep., 1973, vol. 21, No. 7. pp. 542-548.

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