Voice control circuit for a communication terminal

Details Voice control circuit for a communication terminal Voice control circuit for a communication terminal

H - Electricity

04

B

379/81

H04B 1/62 (2006.01) H04M 9/08 (2006.01)

Patent

CA 1282511

Abstract Voice Control Circuit for a Communication Terminal The circuit arrangement serves to control the volume range of the voice signals in a communication terminal, such as a video telephone with hands-free facility. In a hands-free facility, the signal-to-noise ratio is lower than in telephones with handset. To avoid singing, a prior art hands-free facility includes a volume con- trol circuit which decreases or increases the gain in the receive path as the gain in the set path increases or decreases. The problem to be solved is to utilize the maximum possible loop gain without reducing the gain in the receive path. The idea is to place behind the micro- phone (50) a controllable compandor (52) in which the signal voltages from the microphone (50) are A. compressed if they lie above a predetermined level, B. expanded if they lie below the predetermined level, and C. imparted maximum gain if they have the predetermined level. The predetermined signal level, which corresponds to the compression inset point, is varied by a control circuit (90) as a function of the ambient noise. Fig. 12 M.Walker-G.Kohler 6/7-6/7

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