Process for the operation of a transversal filter

Details Process for the operation of a transversal filter Process for the operation of a transversal filter

1977-09-12

1980-02-12

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Frequency or time domain filters and delay lines utilizing...

307221D, 333166, 357 24, H03H 728, G11C 2700, H01L 2978

Patent

active

041885970

ABSTRACT:
In an illustrated embodiment, at least one analog shift register has a number of parallel inputs and one series output. A number of individual evaluating circuits receive the signal to be filtered and supply respective output quantities of charge equal to the product of the difference between the relevant signal value and a predetermined minimum or maximum value, and a respective individual evaluation factor. The output of each evaluating circuit can be connected via a switching element to an associated parallel input. According to the present teaching, a considerably lesser space requirement is realized by operating the filter so that for every consecutive scanned value of the signal each evaluating circuit is read in twice consecutively with a charge shift between such read-in processes, no charge shift being effected between the second read-in process and the first read-in process for the next scanned signal value. Read-in of the held signal may be effected more than twice.

REFERENCES:
patent: 3914748 (1975-10-01), Barton et al.
patent: 3999082 (1976-12-01), Early
patent: 4064533 (1977-12-01), Lampe et al.
patent: 4080581 (1978-03-01), Sakue et al.
Buss et al.-"Transversal Filtering using Charge Transfer Devices" in IEEE Journal of Solid-State Circuits, vol. SC8, No. 2, Apr. 1973; pp. 138-146.
Puckette et al. -"Bucket-Brigade Transversal Filters" in IEEE Transactions on Circuits and Systems, vol. CAS-21, No. 4, Jul. 1974; pp. 502-510.

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