Digital phase shifter

Details Digital phase shifter Digital phase shifter

1975-09-05

1976-12-14

Malzahn, David H.

Registers

Transfer mechanism

Traveling pawl

328155, G06F 100

Patent

active

039977722

ABSTRACT:
In many digital processing systems it is necessary to delay an applied signal by a time interval which is not an integer multiple of the system sampling period. Disclosed herein is a digital phase shifter which utilizes a particular digital filtering scheme for supplying virtually any predetermined delay. Although conceptually related to the digital concepts of phase shift by interpolation and decimation in which the sampling rate is first increased and then restored to the original sampling rate after effecting the desired phase shift, the disclosed phase shifter operates entirely at the system sampling rate. This is accomplished by establishing a specific predetermined subset of digital filter coefficients and combining the coefficients with the input signal samples in a multiplier and accumulator circuit.

REFERENCES:
patent: 3755748 (1973-08-01), Carlow et al.
patent: 3825737 (1974-07-01), Croisier
patent: 3833854 (1974-09-01), Schonover
patent: 3835397 (1974-09-01), D'Antonio
patent: 3908896 (1975-09-01), Monrolin

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