Lattice filter for waveform or speech synthesis circuits using d

Details Lattice filter for waveform or speech synthesis circuits using d Lattice filter for waveform or speech synthesis circuits using d

1978-05-12

1980-06-24

Smith, Jerry

Boots, shoes, and leggings

179 1SA, 179 1SM, G06F 1534, G10L 100

Patent

active

042098440

ABSTRACT:
A digital filter of the type which may be used in circuits for generating complex waveforms, such as human speech. The filter has a multiplier, an adder coupled to the output of the multiplier and various delay circuits coupled to the output of the adder. A latch memory is coupled to the output of one of the delay circuits. Switching circuits are provided for the output of the delay and the latch memory to inputs of the multiplier and the adder to selected times. Coefficients of the filter are preferably stored in a memory coupled to another input of the multiplier. The excitation signal is coupled to the adder in one embodiment and to the multiplier in another embodiment. In either embodiment, the digital filter may be implemented on a single integrated circuit chip.

REFERENCES:
patent: 3662115 (1972-05-01), Saito et al.
patent: 3908085 (1975-09-01), Gagnon
patent: 3975587 (1976-08-01), Dunn et al.
patent: 4022974 (1977-05-01), Kohut et al.
patent: 4052563 (1977-10-01), Noda et al.
patent: 4058676 (1977-11-01), Wilkes et al.

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