Adaptive identification method and device, and adaptive echo canceller implementing such method
US6895094B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 2000 |
| Grant date | May 17, 2005 |
| Priority date | — |
| Expiry date | Mar 20, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The device receives an input signal xt and an observation signal yt, one component of which is the response of a system to the input signal. It determines an error signal et at an instant t in accordance with the equation et=yt−XtTHt−1, where Ht−1 is a vector made up of L coefficients of an identification filter having a finite impulse response representative of the impulse response of the system and XtT=(xt, xt−1, . . . , xt−L+1). A predictive analysis of the input signal is performed by a computation applied to frames of the input signal. The L coefficients of the identification filter are adapted by adding to the vector Ht−1 a vector proportional to where Ut is a vector made up of the L values of a prediction residue of the input signal at the instant t and at the preceding L−1 instants, and λ is a positive or zero coefficient.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.