Digital synchronization technique

Details Digital synchronization technique Digital synchronization technique

1982-04-20

1984-06-05

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

328 72, H04L 702

Patent

active

044532598

ABSTRACT:
Method and apparatus for providing a sequence of digitized samples to a modem in substantial synchronism with the incoming signal baud rate, but without using a variable sampling frequency. An incoming signal is sampled at a fixed rate, stored temporarily in a buffer memory, and then interpolated using a digital interpolation filter to provide a sequence of interpolated samples that are equivalent to those that would have been obtained if a variable-frequency sampling rate had been used. Any relative delay between the samples supplied to the modem and the baud rate is sensed and accumulated in an up/down counter. Then the accumulated delay stored in the counter is used to control the selection of coefficients for the interpolation filter.

REFERENCES:
patent: 3754098 (1973-08-01), Abramson et al.
patent: 4027100 (1977-05-01), Ishiguro
patent: 4119796 (1978-10-01), Jones
patent: 4181975 (1980-01-01), Jenkins
patent: 4242755 (1980-12-01), Gauzan
patent: 4270183 (1981-05-01), Robinson et al.
patent: 4323790 (1982-04-01), Dunning et al.

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