H04M9/082- Two-way loud-speaking telephone systems with means for conditioning the signal, e.g.for suppressing echoes for one or both directions of traffic H04M9/08- Two-way loud-speaking telephone systems with means for conditioning the signal, e.g.H04M9/00- Arrangements for interconnection not involving centralised switching.H04R3/02- Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e.H04R3/00- Circuits for transducers, loudspeakers or microphones.H04R- LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS DEAF-AID SETS PUBLIC ADDRESS SYSTEMS.Assignors: CHIEN, YING-REN, FANG, SHIH HAU, SHIAO, YAO, SU, YU-CHENG, TSAO, YU Publication of US20160057534A1 publication Critical patent/US20160057534A1/en Publication of US9763005B2 publication Critical patent/US9763005B2/en Application granted granted Critical Status Active legal-status Critical Current Adjusted expiration legal-status Critical Links Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority to TW103128680 priority Critical Priority to TW103128680A priority Priority to TW103128680A priority patent/TWI559297B/en Application filed by Yuan Ze University filed Critical Yuan Ze University Assigned to YUAN ZE UNIVERSITY reassignment YUAN ZE UNIVERSITY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
Original Assignee Yuan Ze University Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) ( en Inventor Yu Tsao Shih Hau Fang Yao Shiao Yu-Cheng Su Ying-Ren Chien Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Granted Application number US14/526,702 Other versions US9763005B2 Google Patents US20160057534A1 - Acoustic echo cancellation method and system using the same US20160057534A1 - Acoustic echo cancellation method and system using the same
#WHERE IS MY ACOUSTIC ECHO CANCELLATION WINDOWS#
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#WHERE IS MY ACOUSTIC ECHO CANCELLATION MANUAL#
There's also another link in the Speex manual that gives a higher level overview of Acoustic Echo Cancellation: If synched clocks are not practical it seems that Speex has other methods of dealing with the delayed sampling. (My explanation is subject to review by someone like TheCPUWizard who has first-hand experience).Ĭritical to implementing a system for cancellation is the ability to sample both the incoming voice and the outgoing microphone signal (which contains the acoustic echo) with minimal delay - and preferably with synched clocks.
This pick-up and retransmission of the delayed voice is the acoustic echo that must be canceled. When the other person speaks, his voice is amplified and reverberates acoustically before being picked up again by the microphone and being retransmitted. From my cursory reading of the Speex documentation it seems that the idea is that you have a microphone for talking and a speaker that amplifies your voice and that of the person on the other end. One critical question you had was where do you get the echo signal. I don't want to appear unwilling to help, but it seems that - unlike uLaw conversion with a lookup table or calculation function - echo cancellation with a third-party library is a project that would be beyond my abilities to offer practical advice.
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