Multiplex communications – Duplex – Transmit/receive interaction control
Reexamination Certificate
2004-10-28
2008-12-23
Singh, Ramnandan (Department: 2614)
Multiplex communications
Duplex
Transmit/receive interaction control
Reexamination Certificate
active
07468957
ABSTRACT:
A canceller circuit includes a subtractor, receiving an analog received signal and a replica signal of noise (e.g., echo and/or crosstalk), for carrying out subtraction on the received signal and the replica signal in a continuous time analog domain, an analog-to-digital converter for converting an analog signal output from the subtractor to a digital signal, an adaptive filter, receiving a noise reference signal and an output signal of the analog-to-digital converter, for outputting the replica signal of noise, as a digital signal, a digital-to-analog converter for receiving and converting a digital signal output from the adaptive filter, to an analog signal, and for supplying the analog signal to the subtractor as the replica signal of noise, and a control circuit for variably controlling the sampling phase in the digital-to-analog converter independently of the sampling phase on the side of the analog-to-digital converter, the phase of the signal waveform of the replica signal of the noise, output from the digital-to-analog converter, being controlled by the control circuit to be coincident with the phase of noise received.
REFERENCES:
patent: 5450457 (1995-09-01), Ito et al.
patent: 5675612 (1997-10-01), Solve et al.
patent: 6028902 (2000-02-01), Kiyanagi et al.
patent: 6236645 (2001-05-01), Agazzi
Kurt H. Mueller, et al., “Timing Recovery in Digital Synchronous Data Receivers”, IEEE Transactions on Communications, vol. COM-24, No. 5, pp. 516-531, May 1976.
Akira Kanemasa, et al., “An ISDN Subscriber Loop Transmission System Based on Echo Cancellation Technique”, IEEE Journal on Selected Areas in Communications, vol. SAC-4, No. 8, pp. 1359-1366, Nov. 1986.
Kurt H. Mueller, et al., “Timing Recovery in Digital Synchronous Data Receivers”, IEEE Transactions on Communications, vol. COM-24, No. 5, pp. 516-531, May 1976.
McGinn IP Law Group PLLC
NEC Electronics Corporation
Singh Ramnandan
LandOfFree
Canceller circuit and controlling method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Canceller circuit and controlling method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Canceller circuit and controlling method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4048220