H - Electricity – 04 – B
Patent
H - Electricity
04
B
379/65
H04B 3/20 (2006.01) H04M 1/58 (2006.01)
Patent
CA 1099042
SIGNALING TONE TRANSPARENT ECHO SUPPRESSOR Abstract of the Disclosure 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 af- fecting 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 there- through completely without distortion. In another mode of opera- tion, 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 there- after, 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 corres- ponding output therefrom, and the echo suppressor provides voice- switched echo control and accommodates network signaling without interference to either.
314352
Macrae & Co.
Tellabs Incorporated
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