Voice band reduction apparatus and method for increasing availab

Details Voice band reduction apparatus and method for increasing availab Voice band reduction apparatus and method for increasing availab

1991-03-28

1992-08-25

Shaw, Dale M.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Hearing aid

333 171, G10L 302, H03F 142

Patent

active

051425807

ABSTRACT:
An apparatus for frequency band reduction of a voice signal having an upper and lower band limit including a voice signal input, a clipping circuit for clipping the positive and negative peaks of the voice signal connected to the voice signal input. A bandpass filter is connected to the clipping circuit for rejecting harmonics created by the clipping circuit. A low and high end roll off filter device is provided for producing a given decibel/octave frequency roll off at the lower band limit; and the geometric mean value of the upper and lower band limit falls within a given lower and a given upper frequency range.

REFERENCES:
patent: 2903515 (1959-09-01), Smith
patent: 3084327 (1963-04-01), Cutler
patent: 3297882 (1967-01-01), Broadhead
patent: 3524081 (1970-08-01), Campanella
patent: 3760196 (1973-09-01), Nomoto et al.
patent: 4166924 (1979-09-01), Berkley et al.
patent: 4255620 (1981-03-01), Harris et al.
patent: 4383229 (1983-05-01), Jones
Horowitz et al., The Art of Electronics, Cambridge University Press, p. 42, 1980.

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