Multiport conference circuit

Details Multiport conference circuit Multiport conference circuit

1977-12-05

1979-11-20

Caldwell, Sr., John W.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

179 15AT, 340147R, H04M 356

Patent

active

041752155

ABSTRACT:
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.

REFERENCES:
patent: 4007338 (1977-02-01), McLaughlin
patent: 4022981 (1977-05-01), McLaughlin et al.
patent: 4054755 (1977-10-01), Lee et al.

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