TH22002B - Methods and equipment for controlling the echo on both sides of the connection. - Google Patents

Abstract

DC60 (04/06/47) A single, double-ended reverberation circuit is provided using an adaptive FIR circuit to model the impulse response of the echo path and suppress the resonance signal. Coming from the PSIN side of the connection. And the non-linear processor that is controlled by Input signal levels to eliminate echo caused by the mobile side of the connection, since the linear processing function has not been used for the echo cancellation of the mobile side. Evaluate and eliminate reflections on two sides of the welding Continues can be treated in a single DSP, with all the advantages the byproduct comes with. A single, double-ended resonance circuit is provided using an adaptive FIR circuit to model the resonance path impulse response and eliminate the resonance coming from the PSIN side of the connection. And the non-linear processor that is controlled by Input signal levels to eliminate echo caused by the mobile side of the connection, since the linear processing function has not been used for the echo cancellation of the mobile side. Evaluate and eliminate reflections on two sides of the welding Continues can be treated in a single DSP, with all the advantages the byproduct comes with.

Claims (9)

1.Dehydration circuit for use in double sided echo cancellation. Side of connection Which consists of The first part, containing the FIR filter circuit, is the basis for any removal application. The network's echo received from one side of the aforementioned connection and the second that was linked to the above. The second part contains With non-linear effects for echo suppression and projectors The delay and the level that has been connected to such nonlinear processors. For use in Eliminate the second echo from the digital cellular side of the said weld. 2. The echo cancellation circuit of claim 1, which the above connections Consists of the name of the switch in the mobile service center. 3. The echo cancellation circuit of claim 1, which the above connections It consists of a switch connection in a remote communication system. 4. The echo cancellation circuit of claim 1, which also includes a Generate a noise for the security received when connected to a non-linear processor. The aforementioned line 5. The echo cancellation circuit of claim 1, which one side of the The connection includes PSTN. 6. The echo cancellation circuit of claim 1, which the digital mobile phone The foregoing of the above connections consists of the digital mobile phone. 7. The echo cancellation circuit of claim 1, which is connected to the foregoing. It consists of a direct connection to the pass line. 8. The echo cancellation circuit of claim 1, in which the delay estimator and Level estimates the echo delay on the digital side of the connection and Estimate the relationship between the signal power of the signal being transmitted to the side. The digital cellular side of the connection and the transmission of the second echo signal. 9. The echo cancellation circuit of claim 1, where the processor is non-linear. Has been activated at the selected interval after the signal in the threshold amount has been changed. A transmission to the digital mobile phone side of the connection has been detected. 0.A device for use in eliminating the echo caused by the digital mobile phone that consists of Non-linear processor Noise generator for the convenience of being linked The above non-linear results For generating noise signal for Comfortable by responding to the aforementioned non-linear processors. The echo delay estimator and the power level linked to the body. Process such nonlinear So at the very least, the relationship between The level of the signal being transmitted to the digital mobile phone and the power of Reflections generated by digital mobile phones 1 1. Device of Clause 10 that also contains Digital Signal Processor 1. 2. The device of claim 11 that also contains an echo cancellation circuit. For use in eliminating echo caused by PSTN 1. 3. A method for eliminating echo from two sides of the switch connection, which consists of the following steps: First signal transmission from one side of the switch connection. Impulse response processing for the first echo caused by one side. Of the aforementioned switch connection Which the first echo consists of reflection Back of the first signal Elimination of the first echo signal mentioned above Second signal transmission from the second side of the switch connection. The second echo is measured on the second side of the switch connection in which the second echo consists of the second echo. Estimation of delay for the aforementioned second echo signal. Estimation of the relationship between the first power signal to the second side mentioned. Then of the aforementioned switch connection and the aforementioned second echo, and the elimination of the aforementioned second echo in response to the delay. The above and the relationship above 1 4. Method of claim No. 13, in which the first echo has been mentioned above. Contains the echo signals generated by PSTN 1. 5. Method of claim No. 13, which echoes the second signal mentioned above. It consists of the reflected signal from the digital mobile phone side. 6. Procedures of Clause 13, whereby the process of eliminating the echo The above two contain episodes of noise input for comfort. 7. Procedures of Clause 13, in which the aforementioned switch connection consists of: Connecting a switch in a mobile service call center 1 8. Method of Clause 13 in which the aforementioned switch connection consists of: Connecting a switch in a long distance communication system 1 9. Method of claim 13, in which the second echo elimination procedure answers Responds to the signal power quantity measurement, threshold for the second aforementioned signal 2. 0. Method of Clause 13, which also includes the procedure for calculating the amount of time. For performing a second echo elimination procedure that responds to such correlation