Apparatus and methods for synchronizing a digital receiver

Details Apparatus and methods for synchronizing a digital receiver Apparatus and methods for synchronizing a digital receiver

1979-12-26

1981-12-29

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

340310A, 328155, H03B 306

Patent

active

043086195

ABSTRACT:
Apparatus for synchronizing the bit clock in a digital receiver to be in phase with bits of a received data stream, utilizes a frequency source locked to a system-wide frequency and frequency-arithmetic means for providing first and second local frequencies respectively slightly greater and slightly less than a multiple of the system-wide frequency. Countdown circuitry provides a multiplicity of local clock phases at the local clock frequency for phase comparison with the clock frequency derived from the received data stream and for subsequent digital phase adjustment to cause the local baud clock to track the received data stream bit transition frequency.

REFERENCES:
patent: 3731219 (1973-05-01), Mader et al.
patent: 3944723 (1976-03-01), Fong
patent: 3973087 (1976-08-01), Fong
patent: 3973240 (1976-08-01), Fong
patent: 4032858 (1977-06-01), Hargis
patent: 4109204 (1978-08-01), Kincaid
patent: 4119926 (1978-10-01), Frosch
patent: 4135181 (1979-01-01), Bogacki et al.
patent: 4161720 (1979-07-01), Bogacki

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