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Class Information
Number: 381/54
Name: Electrical audio signal processing systems and devices > Helium speech
Description: Subject matter where an output speech signal is of differing apparent predominant frequency but of the same duration as the input speech signal.

Patents under this class:

Patent Number Title Of Patent Date Issued
8438033 Voice conversion apparatus and method and speech synthesis apparatus and method May. 7, 2013
RE31614 Decreasing time duration of recorded speech Jun. 26, 1984
4342104 Helium-speech communication Jul. 27, 1982
4271331 Analog processing system for real-time conversion of the frequency of analog signals Jun. 2, 1981
4079197 Voice transcoder in helium atmosphere Mar. 14, 1978
3965298 Deep sea diving speech converter Jun. 22, 1976
3955050 System for audibly recognizing an aurally unclassifiable signal May. 4, 1976
3950617 Helium speech unscrambler with pitch synchronization Apr. 13, 1976

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