Transmission apparatus having echo cancellation facility

Details Transmission apparatus having echo cancellation facility Transmission apparatus having echo cancellation facility

1996-11-21

1999-04-20

Le, Amanda T.

Pulse or digital communications

Systems using alternating or pulsating current

Antinoise or distortion

375296, 375346, 370286, 379402, 379406, 379410, H04B 320

Patent

active

058964207

ABSTRACT:
A transmission apparatus, connected via a hybrid circuit to a line, such as a modulator-demodulator which can perform stable echo cancellation, whether the level of the far-end echo is high or not, provided with a transmission unit which generates a transmission signal to be transmitted to the line via the hybrid circuit, a reception unit which receives the reception signal supplied from the line via the hybrid circuit, and a superimposing means for superimposing the reception signal applied to the hybrid circuit onto the transmission signal. The transmission signal onto which the reception signal is superimposed by the superimposing means is transmitted to the line via the hybrid circuit.

REFERENCES:
patent: 4464545 (1984-08-01), Werner
patent: 4652703 (1987-03-01), Lu et al.
patent: 4796296 (1989-01-01), Amada et al.
patent: 5347539 (1994-09-01), Sridhar et al.

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