Title:
【発明の名称】送受信器ユニットにおけるエコーをキャンセルするためのエコーキャンセル装置
Document Type and Number:
Japanese Patent JP2003506924
Kind Code:
A
Abstract:
An echo cancellation device (ECD) comprises an echo canceller (EC) including a transfer function estimator (EST, H) and a subtractor (ADD) and a residual echo suppression device (G, ADD2). The residual echo suppression device (G) comprises a residual echo filter (G) having an adjustable filter function (g). This filter function (g) can be adapted to either remove from the subtractor output (TNE') the spectral characteristics relating to the reception signal (RFE) and/or to emphasize in the subtractor output signal (TNE') a background signal spectral content relating to the transmission signal (TNE). A noise generation means (NGM') can be provided at the output of the adaptable filter (G) for injecting a noise process in to the filter output signal (TNE') prior to a speech coding in a speech coder (COD). The noise process masks in the filter output signal a spectral content relating to the reception signal (RFE).
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Inventors:
Wolf, Lintgren
Mithra, Mohan
Phillipson, Yoon
Mithra, Mohan
Phillipson, Yoon
Application Number:
JP2001513872A
Publication Date:
February 18, 2003
Filing Date:
July 28, 2000
Export Citation:
Assignee:
Telefon Acty Bora Get Elm Ericsson (Pubble)
International Classes:
G10L21/0208; G10L21/0224; H04B3/21; H04B3/23; H04B7/015; H04M1/00; H04M1/60; H04M9/08; (IPC1-7): H04B3/23; G10L21/02; H04B7/015; H04M1/00; H04M1/60
Attorney, Agent or Firm:
Yasunori Otsuka (3 others)