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"That’s an amazing invention, but who would ever want to use one of them?"
President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
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| Number | Title | Issue Date |
| 6928406 | Excitation vector generating apparatus and speech coding/decoding apparatus The total number of entries of an algebraic codebook is decreased by liming a random code vector generated from the algebraic codebook, and entries of a random codebook with a large number of pulses are assigned to a decreased portion. Further, the number of entries... | 08/09/2005 |
| 4342104 | Helium-speech communication The invention relates to a novel helium-speech unscrambler which can be located at a diver's location, and enables the helium-speech voiced by the diver to be subjected to waveform time expansion to reduce the bandwidth of the helium speech (e.g. to 2 to ... | 07/27/1982 |
| 4271331 | Analog processing system for real-time conversion of the frequency of analog signals An analog signal processing system is described for changing the frequency of analog signals in a real-time manner. The system includes at least two analog shift registers, (specifically, three analog shift registers), an input circuit connecting the inpu... | 06/02/1981 |
| 4079197 | Voice transcoder in helium atmosphere 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 freque... | 03/14/1978 |
| 3965298 | Deep sea diving speech converter A device having an analog storage for storing in real time an electric analogue signal proportional to vocal tract resonance periods within speech pitch periods of speech in gas in deep sea diving. A clock is used for providing clock pulses proportional t... | 06/22/1976 |
| 3955050 | System for audibly recognizing an aurally unclassifiable signal This invention relates to a system for audibly recognizing a received signal aurally unclassifiable because of its improper (not clearly bearable) time duration and/or the frequency band occupied thereby. The received signal may be a carrier wave, modulat... | 05/04/1976 |
| 3950617 | Helium speech unscrambler with pitch synchronization A pitch synchronized helium speech unscrambler is disclosed as including a air of bucket brigade analog delay lines which are timely and rapidly loaded with the electrical signal equivalents of human voice signals that are effectively supplied thereto by a... | 04/13/1976 |
