PULSE WIDTH DECODER FOR DOUBLE FREQUENCY ENCODED SERIAL DATA

PULSE WIDTH DECODER FOR DOUBLE FREQUENCY ENCODED SERIAL DATA 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...

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Bibliographische Detailangaben
Hauptverfasser:	SYLVERNALE, ENSI P, LEVY-NAVARRO, BERNARDO A/K/A LEVY, BERNARDO
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	BASIC ELECTRONIC CIRCUITRY CODE CONVERSION IN GENERAL CODING DECODING ELECTRICITY INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER PHYSICS
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Beschreibung
Zusammenfassung:	PULSE WIDTH DECODER FOR DOUBLE FREQUENCY ENCODED SERIAL DATA 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.