US 6,983,047 B1 | ||
Echo canceling system for a bit pump and method of operating the same | ||
Mandeep Singh Chadha, Austin, Tex. (US); Shawn Robert McCaslin, Buda, Tex. (US); and Mile Milisavljevic, Austin, Tex. (US) | ||
Assigned to Lucent Technologies Inc., Murray Hill, N.J. (US) | ||
Filed on Aug. 29, 2000, as Appl. No. 9/650,853. | ||
Int. Cl. H04M 9/08 (2006.01) |
U.S. Cl. 379—406.01 | 14 Claims |
1. A bit pump having a transmit path and a receive path, comprising:
a precoder, coupled to said transmit path, to precondition a transmit signal propagating along said transmit path;
a modulator, coupled to said precoder, to reduce a noise associated with said transmit signal;
an analog-to-digital converter, coupled to said receive path, to convert a receive signal received at said bit pump into a
digital format;
a decimator, coupled to said analog-to-digital converter, to downsample said receive signal propagating along said receive
path; and
an echo canceling system, coupled between said transmit and receive path, to attenuate an echo in said receive signal, including:
a slave echo canceling stage to employ a filter coefficient to attenuate said echo,
a separation circuit, coupled to said slave echo canceling stage, to generate data representing a residual echo substantially
exclusive of said receive signal, and
a master echo canceling stage, coupled to said separation circuit, to receive said data and modify said filter coefficient
based thereon.
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