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

H - Electricity

03

M

354/68

H03M 5/12 (2006.01) G11B 20/14 (2006.01) H04L 25/48 (2006.01)

Patent

CA 1289664

ABSTRACT OF THE DISCLOSURE 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.

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