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Primary Examiner: Malzahn, David H.
Assistant Examiner:
Attorney: Gurey; Stephen M.

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Title: Wave digital filter with multiplexed arithmetic hardware

Abstract: The wave digital filter derived from a symmetric lattice reference filter includes two one-port networks each of which consists of storage elements interconnected by arithmetic units. Each arithmetic unit comprises a digital multiplier and three digital adders. Higher order filters thus require a substantial amount of arithmetic hardware. In accordance with the present invention, the amount of arithmetic hardware in the wave digital filter derived from a symmetric lattice filter is substantially reduced by multiplexing an arithmetic unit in each one-port network. In particular, a single arithmetic unit in each one-port is successively configured as each individual arithmetic unit of the non-multiplexed one-port. Intermediate output signals are stored in temporarily vacant storage elements. In one described embodiment of the present invention, the two multiplexed one-port networks of the wave digital filter are further multiplexed to require only one arithmetic unit.

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Inventors: Mandeville, Gordon J. (Lawrence, MA, US)

Application Number: 935873
Filing Date: 1978-08-23
Publication_date: 1980-03-04
Assignee: Bell Telephone Laboratories, Incorporated (Murray Hill, NJ)
Primary Class(es): 708/317
Other Classes:
US Patent Ref:

3919671	Nov, 1975	Fettweis et al.	333/70.
3967099	Jun, 1976	Fettweis	364/724.
3980872	Sep, 1976	Fettweis et al.	364/724.
4095276	Jun, 1978	Verkroost et al.	364/724.

Other Refs: Other References: Fettweis et al., "On Adaptors for Wave Digital Filters," IEEE Trans. on Acoustics, Speech & Signal Processing, vol. ASSP-23, No. 6, Dec. 1975, pp. 516-525.
Nouta, "Class of Wave Digital Filters Consisting Only of Address & Multipliers" Electronics Letters, vol. 12, No. 19, Sep. 1976, pp. 500-501.