Patent SG-11201407085U-A (SG)
Title: A universal reconfigurable echo cancellation system
Inventor: VERITY STEVEN
IPC: G10L21/02
Filed: 2013-04-30
Abstract: (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (43) International Publication Date 7 November 2013 (07.11.2013) WIPOIPCT (10) International Publication Number WO 2013/166080 A1 (51) International Patent Classification: G10L 21/02 ( 2013.01) (21) International Application Number: (22) International Filing Date: (25) Filing Language: (26) Publication Language: PCT/US2013/038958 30 April 2013 (30.04.2013) English English (30) Priority Data: 61/640,681 30 April 2012 (30.04.2012) US (71) Applicant: CREATIVE TECHNOLOGY LTD [SG/SG]; 31 International Business Park, #03-01 Creative Resource, Singapore 609921 (SG). (72) Inventors; and (71) Applicants (for US only): YANG, Jun [US/US]; 1144 Little John Way, San Jose, California 95129 (US). MINETT, Ian [GB/US]; 1180 Muriel Ct„ San Jose, Cali­ fornia 95121 (US). RIDDER, Robert [NL/US]; 2339 Muriel Drive, Santa Cruz, California 95062 (US). VER­ ITY, Steven [US/US]; 623 Los Padres Blvd., Santa Clara, California 95050 (US). (74) Agents: GEAN, Desmund et al.; Creative Labs, Inc., (Leg­ al Department), 1901 McCarthy Boulevard, Milpitas, Cali­ fornia 95035 (US). (81) Designated States (unless otherwise indicated, for every kind of national protection available)'. AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available)'. ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG). Published: — with international search report (Art. 21(3)) — before the expiration of the time limit for amending the claims and to be republished in the event of receipt of amendments (Rule 48.2(h)) (54) Title: A UNIVERSAL RECONFIGURABLE ECHO CANCELLATION SYSTEM 511 7^\" 502 51 p AEC Linear Processing Nonlinear Echo Processing 508 514 Echo Leakage Prevention 51.6 518 500 520 HPF TD STFT, FD HPF REC FD NR REC r~ 504 Reference T~ 506 o 00 o i-H en i-H o CJ o & Figure 5 (57) Abstract: A universal reconfigurable system and method are provided for reducing nonlinear echo and residual echo, and for echo leakage prevention in various time-varying and complex environments is proposed in this invention. According to one embodi - ment, an echo cancellation system includes (1) an adaptive linear filter implemented in either time-domain or frequency-domain; (2) a nonlinear echo suppression; (3) echo leakage prevention; (4) direct current (DC), low frequency residual echo and noise reduction; (5) time-domain nonlinear processor (NLP) to reduce the residual echo; and (6) frequency-domain NLP to further reduce the resid­ ual echo. The echo cancellation system is universally applicable to acoustic echo cancellation (AEC) and/or electrical echo cancella­ tion applications. In terms of AEC, this invention reconfigurable is for one or more microphones and/or one or more reference chan - nels. The numbers of microphones and reference channels are user configurable.