H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/64, 379/81
H04M 9/08 (2006.01) H04B 3/20 (2006.01)
Patent
CA 1288186
DESCRIPTIVE ABSTRACT Device for performing the "hands-free" function in a telephone set associating the gain switching and echo suppression functions. This device is characterized in that it comprises a gain switch and an echo suppression means (20), said switch having in the emission and reception channels means (10,11) for measuring the amplitude of the signals present on these channels, a circuit (12) for determining the state of the telephone set (emission, reception, rest, a calculating member (13) controlled by circuit (12), variable attenuators (14,15) controlled by the calculating member (13), said calculating member evaluating, as a function of the relative ampli- tudes of the signals in emission and in reception, the echo suppres- sion performances obtained by the device and adjusting as a function thereof the attenuators (14,15) in each channel, so that the overall attenuation in the loop always assumes the minimum value ensuring the stability of the system. Application in telephony. Figure 2 B 9251.C RS
560300
Connan Jean-Louis
Huiban Jean-Yves
Pinaud Serge
Connan Jean-Louis
Goudreau Gage Dubuc
Huiban Jean-Yves
Pinaud Serge
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