Canceller device and data transmission system
AssigneeNEC Electronics Corporation
InventorYasunari Shida
Life of this patent
Estimating the term…
Abstract
Disclosed is a canceller device comprising a subcanceller for compensating the sampling phase shift of a plurality of analog-to-digital convert circuits for receiving a common input analog signal, converting the analog signal into digital signals responsive to respective sampling clock signals with different phases to each other, and for outputting the digital signals, a main canceller for canceling echo/cross-talk from the signal output from analog-to-digital convert circuits whose the sampling phase shifts have been compensated, and a compensation range selection circuit for determining the range of the sampling phase shift for being compensated by the subcanceller based on the tap coefficients of the main canceller.
Claims18
A canceller device for canceling echo and/or cross-talk from a signal output from an interleaved analog-to-digital converter circuit, said canceller device comprising:
- a first canceller for compensating a sampling phase shift of said interleaved analog-to-digital converter circuit;
- and
- a second canceller for canceling echo and/or cross-talk from the signal, output from an interleaved analog-to-digital converter circuit, whose sampling phase shift has been compensated.
A canceller device that, based on a prescribed training algorithm, carries out cancellation of echo and/or cross-talk from signals output from a plurality of analog-to-digital converter circuits, said plurality of analog-to-digital converter circuits having input terminals for receiving an analog input signal connected in common and converting said analog input signal into digital signals to output the resultant digital signals, responsive to respective sampling clock signals having respective phase spaced apart, said canceller device comprising:
- a first canceller for receiving a digital transmission signal and an error signal, outputting a replica of echo and/or cross-talk, and for compensating a sampling phase shift of said plurality of analog-to-digital converter circuits;
- a second canceller for receiving said digital transmission signal and said error signal, and canceling echo and/or cross-talk from signals, output from said plurality of analog-to-digital converter circuits, each of said signals having the sampling phase shift compensated;
- and
- a compensation range selection circuit for controlling to select a position of the sampling phase shift for being subjected to compensation by said first canceller;
- wherein
- said compensation range selection circuit estimates a tap position at which the sampling phase shift needs to be compensated based on tap coefficients of said second canceller after training, and selects taps used by said first canceller.
A canceller device for canceling a noise from a signal output from an interleaved analog-to-digital converter circuit, said canceller device comprising:
- a first canceller for compensating a sampling phase shift of said interleaved analog-to-digital converter circuit;
- and
- a second canceller for canceling the noise from the signal, output from an interleaved analog-to-digital converter circuit, whose sampling phase shift has been compensated.
Dependencies are inferred from the claim text.