H - Electricity – 04 – M
Patent
H - Electricity
04
M
363/12, 344/14,
H04M 3/56 (2006.01)
Patent
CA 1101529
ABSTRACT OF THE DISCLOSURE An improved conference technique whereby a number of channels in a telephone switching system employing pulse code modulation for transmission purposes are combined so that a number of subscribers may participate in a common telephone conversation. The conference circuit is provided with a continuous threshold to pass the primary signal and to exclude the reflection. It is only used in the selection process, and for conditions which do not provide the threshold being met, the previous speaker is retained.
310943
Fetterer Gerald F.
Mclaughlin Donald W.
Gte Automatic Electric Laboratories Incorporated
R. William Wray & Associates
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