Method and apparatus for repetitively producing a noise-like aud

Details Method and apparatus for repetitively producing a noise-like aud Method and apparatus for repetitively producing a noise-like aud

1978-01-16

1980-03-04

Kamm, William E.

Surgery

Truss

Perineal

A61B 1900

Patent

active

041911750

ABSTRACT:
A digital pulse generator and shift register repetitively produce bursts of digital pulses at a first adjustable repetition frequency. The repetition frequency of the pulses in each burst is also adjustable. A pink noise filter accentuates the lower burst frequency components near 7 hz and substantially attenuates all frequency components of the bursts above a first cut-off point near 10 Khz. A tunable band pass amplifier having a center frequency adjustable over a preselected range of frequencies optimally detectable by the average human ear accentuates the pink noise filter output near 2.6 Khz. The tunable amplifier drives an audible signal source with noise-like pulses of varying amplitudes and frequency components. A low pass amplifier may be connected to the pink noise filter to generate a train of pulses having a repetition frequency near 7 hz which pulses a light source in synchronism with the audible noise-like signal.

REFERENCES:
patent: 3576185 (1971-04-01), Schulz et al.
patent: 4034741 (1977-07-01), Adams et al.
Faran "The General Radio Experimenter" vol. 36, No. 7, Jul., 1962, pp. 4-5, 331/78.

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