Pulse or digital communications – Receivers – Angle modulation
Patent
1996-02-06
1997-05-06
Chin, Stephen
Pulse or digital communications
Receivers
Angle modulation
329304, H03D 322, H04L 2722
Patent
active
056278624
ABSTRACT:
An apparatus for demodulating a phase modulation wave reduces an error rate of a demodulating circuit to perform a delay detection of an n-phase shift keying modulation wave without raising a clock frequency. When converting the received n-phase shift keying modulation wave into a rectangular wave, a waveform converting circuit for converting the n-phase shift keying modulation wave into a rectangular wave of a duty ratio which is larger or smaller than 50% is used. The rectangular wave is clocked through parallel registers of different lengths, outputs of the registers being operated on by exclusive-OR gates with the rectangular wave. Outputs of the gates are applied to respective one of a pair of counters, operated by a common clock signal, during periods of equality of outputs signals of the gates to provide a function of discriminating reproduction. A parallel/series converting circuit arranges upper bits and lower bits for reconstruction of each symbol of an original data message.
REFERENCES:
patent: 5355092 (1994-10-01), Kosaka et al.
patent: 5426669 (1995-06-01), Yamamoto et al.
Honda Manabu
Mito Kenji
Chin Stephen
Lee Betsy P.
Pioneer Electronic Corporation
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