Boots – shoes – and leggings
Patent
1978-08-23
1980-03-04
Malzahn, David H.
Boots, shoes, and leggings
G06F 1534, H03H 710
Patent
active
041920082
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.
REFERENCES:
patent: 3919671 (1975-11-01), Fettweis et al.
patent: 3967099 (1976-06-01), Fettweis
patent: 3980872 (1976-09-01), Fettweis et al.
patent: 4095276 (1978-06-01), Verkroost et al.
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.
Bell Telephone Laboratories Incorporated
Gurey Stephen M.
Malzahn David H.
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