Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1978-02-22
1979-09-04
Claffy, Kathleen H.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307237, 328165, H04B 1500
Patent
active
041669240
ABSTRACT:
A system is disclosed for automatically reducing reverberation in typical voice telecommunications systems. This system uses center clipping levels adaptive to the level of reverberation input speech. In one configuration, the voiceband is divided into two sub-bands and center clipping occurs only for the lower band; costs are reduced with surprisingly little transmission quality sacrifice. Clipping-level holdover circuitry with exponential decay appears to work well for a large variety of reverberant enclosures.
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O. Mitchell, G. Yates, T. Bateman; "Reduction of Long-Time Reverberation by Center Clipping," Journal of the Acoustical Society of America; Fall 1975; p. S130.
D. Berkley, M. Mitchell; "Seeking the Ideal in Hands-Free Telephony;" Bell Labs Record; Nov. 1974; pp. 318-325.
Berkley David A.
Mitchell Olga M. M.
Bell Telephone Laboratories Incorporated
Claffy Kathleen H.
Logan H. L.
Myers Randall P.
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