1976-11-12
1978-03-14
Claffy, Kathleen H.
179 1555T, 179 1555R, G10L 100
Patent
active
040791971
ABSTRACT:
A voice transcoder for use in compensating for sound distortions in helium speech, including a plurality of audio frequency channels, each defining a particular frequency band, the center frequencies of the channels being logarithmically spaced and frequency bands together covering the helium speech frequency band to be transcoded. Each channel comprises a band-pass filter coupled to a detector, a divider dividing band-pass filter by detector output to provide a signal having the frequency delivered from the band-pass filter at a standard amplitude, and a mutliplier multiplying divider output by another channel detector output to synthesize a part of the transcoded audio signal, the different parts of the transcoded signal being combined in an adder-subtracter. The said multiplier has one input coupled from divider output in the channel of rank i and the other input coupled from rectifier output in the channel of rank i + x, x being the same for any multiplier. x is selected in accordance with the proportion of helium in the gas breathed by the speaker. Each channel comprises a multiplexer selected according to x for performing the adequate connections to the channel multiplier.
REFERENCES:
patent: 3600515 (1971-08-01), Carpenter
patent: 3863026 (1975-01-01), Dildy
Claffy Kathleen H.
Kemeny E. S.
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