Echo cancellation device for cancelling echos in a transceiver unit

  • US 6,597,787 B1
  • Filed: 07/28/2000
  • Issued: 07/22/2003
  • Est. Priority Date: 07/29/1999
  • Status: Expired due to Term
First Claim
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1. An echo cancellation device (ECD) for canceling echoes caused by a coupling of a reception signal (RFE) received by a receiving unit (RX) of a transceiver unit (TRU) of a telecommunication system (TELE) to a transmitting unit (TR) thereof, comprising:

  • a) a transfer function estimator (EST, H) adapted to estimate the coupling transfer function (H) from the receiving unit (RC, SP, RCRT) to the transmitting unit (TR, MC, TCRT) and for processing the reception signal (RFE) with the estimated coupling transfer function (H);

    b) a subtractor (ADD) adapted to subtract from the transmission signal (TNE) which includes an echo signal due to the coupling of the received signal (RFE) to the transmitting unit (MC, TCRT) the processed reception signal (RFE′

    ); and

    c) a residual echo suppression device for suppressing residual echoes in the subtractor output signal (ADD);

    wherein d) the residual echo suppression device comprises a residual echo filter (G) having an adjustable filter function (g) adapted to remove from the subtractor output signal (TNE′

    ) of the subtractor (ADD) the spectral characteristics relating to the reception signal (RFE).

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