Wide window decoder circuit for dual phase pulse modulation

Details Wide window decoder circuit for dual phase pulse modulation Wide window decoder circuit for dual phase pulse modulation

2006-07-18

2006-07-18

Fan, Chieh (Department: 2631)

Pulse or digital communications

Pulse width modulation

C329S345000, C329S312000, C370S205000, C370S212000

Reexamination Certificate

active

07079577

ABSTRACT:
A dual phase pulse modulation (DPPM) decoder circuit processes a DPPM signal, which is in the form of a series of high and low pulses whose pulse widths represent successive groups of M data bits, so as to recover data carried by the signal. Each of the 2Mpossible data values of an M-bit group corresponds to one of 2Mdistinct pulse widths. Circuit blocks determine the width of each pulse by piping the DPPM signal through a short delay chain and inputting the delayed outputs and the non-delayed signal into AND logic gates, whose outputs are used to clock flip-flop registers. The registers are reset to a known state at the start of each signal pulse and toggled to an opposite state if clocked. The registered outputs are interpreted by logic to obtain the corresponding M-bit groups.

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