PCM receiver with lock state control

Details PCM receiver with lock state control PCM receiver with lock state control

1988-06-30

1990-08-14

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

329306, 375119, H03D 302, H04L 2722

Patent

active

049493566

ABSTRACT:
Lock state control is provided for the demodulator in a PCM receiver, including those demodulators using quadrature frequency shift keying, by selectively incrementally changing the phase of the received modulated carrier or of the "down converting" local oscillator. Switching means are provided to selectively shift the phase in multiples of 360/N degrees, where N is the number of available demodulation lock states, such as the number 4 in a quadri-phase system.

REFERENCES:
patent: 3238459 (1966-03-01), Landee
patent: 3242262 (1966-03-01), Melas
patent: 4027265 (1977-05-01), Kobayashi et al.
patent: 4185273 (1980-01-01), Gowan
patent: 4700347 (1987-10-01), Rettberg et al.

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