Recorder memory with variable read and write rates

Details Recorder memory with variable read and write rates Recorder memory with variable read and write rates

1977-02-08

1979-02-20

Fears, Terrell W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

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

Patent

active

041410394

ABSTRACT:
An addressable memory is supplied with pulse coded data at a first rate for writing such data into addressable locations in the memory; and stored data is read out from addressable locations at another rate different from the write-in rate. One advantageous application of such a memory is for changing the time-axis parameter, such as the repetition rate, of data so as to effect time compression and/or expansion. Control over the memory is achieved by generating write clock pulses and read clock pulses at different repetition rates. Data, such as a pulse data bit, is written into an addressable location in the memory during the interval between successive write clock pulses. A data pulse bit is read out of the memory during the interval between successive read clock pulses. The read operation is delayed in the event that it coincides with a write operation. The resultant asynchronous pulse bits which are read out of the memory are reclocked, or synchronized, with the read clock pulses so as to form a synchronous pulse train at the read clock pulse repetition rate.

REFERENCES:
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. Soc.; vol. 21, No. 7, Sep. 1973; pp. 535-541.
"PCM Recorder--A New Type of Audio Magnetic Tape Recorder", by Sato; J. Audio Eng. Soc.; vol. 21, No. 7; Sep. 1973; pp. 542-548.

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