Dual phase pulse modulation decoder circuit

Details Dual phase pulse modulation decoder circuit Dual phase pulse modulation decoder circuit

2005-09-20

2005-09-20

Chin, Stephen (Department: 2634)

Pulse or digital communications

Transmitters

C341S053000, C341S068000

Reexamination Certificate

active

06947493

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 using the delayed outputs to clock flip-flop registers to sample the non-delayed signal. The registered output is interpreted by logic gates to obtain the corresponding M-bit groups. The decoder circuit may have two substantially identical pulse width determining blocks, one receiving the DPPM signal for measuring high pulses, and the other receiving an inverted DPPM signal for measuring the low pulses.

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