Pulse width decoder for double frequency encoded serial data

Details Pulse width decoder for double frequency encoded serial data Pulse width decoder for double frequency encoded serial data

1983-10-31

1985-10-15

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

375110, H03K 1324

Patent

active

045477647

ABSTRACT:
Disclosed is a pulse width decoder which receives a double frequency modulated (DFM) waveform and recovers therefrom the contained NRZ-L data and clock information. Basically, the decoder looks for long and short pulses in the DFM waveform. A long pulse is decoded as a "0", while a pair of short, opposite polarity pulses are decoded as a "1". In addition, in order to allow for pulse shortening in the DFM waveform, a short pulse followed by a long pulse is interpreted as a "1". The clock signal is primarily derived from two delayed versions of the DFM waveform to create one clock edge every bit time.

REFERENCES:
patent: 3237176 (1966-02-01), Jenkins
patent: 3448445 (1969-06-01), Vallee
patent: 4320525 (1982-03-01), Woodward
patent: 4344039 (1982-08-01), Sugiura
Brown, "IBM Technical Disclosure Bulletin", vol. 21, No. 11, Apr. 1979, pp. 4611-4613.

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