Echo cancelling device for data transmission over two-wire lines

Details Echo cancelling device for data transmission over two-wire lines Echo cancelling device for data transmission over two-wire lines

1988-03-07

1989-12-12

Ng, Jin F.

Multiplex communications

Wide area network

Packet switching

379410, H04B 323

Patent

active

048872571

ABSTRACT:
Echo cancelling device for cancelling echoes affecting the incoming signal received over a two-wire telephone line, comprising near echo canceller 20, far echo canceller 22 and an adder 26 providing the estimated echo signal. A circuit path including a digital-to-analog converter 48 for converting the digital estimated echo signal into analog form and a subtracter 52 for subtracting the resulting analog signal from the analog incoming signal, is separated from a circuit path including an analog-to-digital converter 42 for converting the analog incoming signal into digital form and a subtracter 44 for subtracting the digital estimated echo signal from the resulting digital incoming signal thereby providing a digital signal used as a control signal for adjusting the echo cancellers 20 and 22.

REFERENCES:
patent: 4232400 (1980-11-01), Yamamoto et al.
patent: 4577309 (1986-03-01), Barazeche et al.
patent: 4669116 (1987-05-01), Agazzi et al.

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