| US 7,403,608 B2 | ||
| Echo processing devices for single-channel or multichannel communication systems | ||
| Monique Auvray, Lannion (France); Grégoire Le Tourneur, St Quay-Perros (France); and Jean-Philippe Thomas, Trevou Treguignec (France) | ||
| Assigned to France Telecom, Paris (France) | ||
| Appl. No. 10/519,744 PCT Filed Jun. 18, 2003, PCT No. PCT/FR03/01874 § 371(c)(1), (2), (4) Date Dec. 28, 2004, PCT Pub. No. WO2004/004298, PCT Pub. Date Jan. 08, 2004. |
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| Claims priority of application No. 02 08056 (FR), filed on Jun. 28, 2002. | ||
| Prior Publication US 2006/0034355 A1, Feb. 16, 2006 | ||
| Int. Cl. H03M 9/08 (2006.01) | ||
| U.S. Cl. 379—406 [379/406.02] | 35 Claims |
| 1. An echo processing device for attenuating echo components of a direct signal X1n in a return signal Y2n, said device comprising:
means for calculating a receive gain Grn and a send gain Gen;
first gain application means for applying the receive gain Grn to the direct signal and producing an input signal X2n emitted into an echo generator system;
second gain application means for applying the send gain Gen to an output signal Y1n from the echo generator system and producing the return signal Y2n; and
means for obtaining a coupling variable COR characteristic of the acoustic coupling between the direct signal X1n or the input signal X2n and the output signal Y1n, by calculating a correlation between the direct signal X1n or the input signal X2n and the output signal Y1n;
wherein said gain calculation means is configured to calculate the receive gain Grn and the send gain Gen based on said coupling variable.
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