Digital filter

Details Digital filter Digital filter

1975-03-17

1976-05-25

Morrison, Malcolm A.

Registers

Transfer mechanism

Traveling pawl

325 38B, 328167, 333 18, G06F 102, G06F 1534

Patent

active

039596370

ABSTRACT:
A digital filter for a plural digitally expressed pulse code modulated (PCM) signal utilizes a storage register to retain several samples of the signal and obviates the need for digital multiplication circuits by using a delta coding for the filter coefficients. Processing steps are at a multiple of the sampling rate and at each step, the value of one stored sample is combined additively or subtractively with previously stored sample values as determined by stored delta coefficient values. The summed values are periodically transmitted as output samples of a filtered PCM signal.

REFERENCES:
patent: 3633105 (1972-04-01), Lender et al.
patent: 3633170 (1972-01-01), Jones, Jr.
patent: 3639848 (1972-02-01), Elliott
patent: 3699321 (1972-10-01), Gibson
patent: 3777130 (1973-12-01), Croisier et al.
patent: 3794816 (1974-02-01), Esteban
patent: 3822404 (1974-07-01), Croisier et al.

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