Patent
1977-12-14
1979-12-04
Konick, Bernard
1791708, H04B 320
Patent
active
041773616
ABSTRACT:
An improved echo suppressor for use at intermediate points in a telephone transmission facility, whereat both speech signals and single frequency signaling tones may simultaneously be present, provides voice-switched echo control without affecting network signaling. In one mode of operation, during periods of critical signaling tone transmission and while high level or augmented tone is present, such as during dial pulsing, the echo suppressor is automatically disabled and completely transparent to the tone, whereby the signaling tone may pass therethrough completely without distortion. In another mode of operation, during periods of continuous low level signaling tone, the tone is blocked from an attenuation control portion of the echo suppressor and is reinserted into the transmission facility thereafter, irrespective of the presence or absence of speech energy in the facility. In this manner, whenever SF signaling tone is present at an input to the detector it is present at a corresponding output therefrom, and the echo suppressor provides voice-switched echo control and accommodates network signaling without interference to either.
REFERENCES:
patent: 3069501 (1962-12-01), Gilman et al.
patent: 3280274 (1966-10-01), Schoeffler
patent: 3349191 (1967-10-01), Mann
patent: 3769466 (1973-10-01), Von Pfeil et al.
patent: 4018996 (1977-04-01), Kahn
patent: 4115668 (1978-09-01), Skrovanek et al.
Konick Bernard
Myers Randall P.
Tellabs Inc.
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