Patent SG-11201906584W-A (SG)
Title: Inter-channel bandwidth extension spectral mapping and adjustment
Inventor: CHEBIYYAM VENKATA SUBRAHMANYAM CHANDRA SEKHAR
IPC: G10L21/038
Filed: 2018-02-08
Abstract: OGC ' 00 O N O (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (43) International Publication Date 13 September 2018 (13.09.2018) WIP0 I PCT 0111111010 0111 °nolo Oil ioo IH 01O 0111 IIII iflo oimIE (10) International Publication Number WO 2018/164805 Al 212, (51) International Patent Classification: G10L 19/008 (2013.01) GlOL 21/038 (2013.01) GlOL 19/02 (2013.01) (21) International Application Number: PCT/US2018/017359 (22) International Filing Date: 08 February 2018 (08.02.2018) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: 62/469,432 09 March 2017 (09.03.2017) US 15/890,670 07 February 2018 (07.02.2018) US (71) Applicant: QUALCOMM INCORPORATED [US/US]; ATTN: International IP Administration, 5775 Morehouse Drive, San Diego, California 92121-1714 (US). (72) Inventors: CHEBIYYAM, Venkata Subrahmanyam Chandra Sekhar; 5775 Morehouse Drive, San Diego, California 92121-1714 (US). ATTI, Venkatraman; 5775 Morehouse Drive, San Diego, California 92121-1714 (US). (74) Agent: TOLER, JEFFREY G.; 8500 Bluffstone Cove, Suite A201, Austin, Texas 78759 (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, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, (54) Title: INTER-CHANNEL BANDWIDTH EXTENSION SPECTRAL MAPPING AND ADJUSTMENT 212 440 442 High-Band Reference Channel Determination High-Band Reference High-Band Reference Channel Indicator High-Band Reference Channel Channel Indientor Channel Indicator RiKhe Unit 404 Encoder as Ch cl I r Eitatream 214 '234 liattnr _ieL 4. Non-Rcloronco High-Band Excitation Generator Quantized High-Band LPG 457 tAugiet 452 High-Band Excitation SignA Linear Prediction 454 Combiner 422 Coefficient (LPC) Synthesis Fiter High-Band Modula,od Multiplier 410 Spectral Noise Mapping Synthesized Bitstream 482 Gain(b) -__on-Reference HIgh-Band 45R Non-Reference High-Band 424 Excitation 456 High-Bnd Target Channel Generator 412 Spectral Mapping Estimator 414 Spectral Mapping Qua finer rh 't 214 Spectral ) i on-Ref erence Non-Reference High-Band (]tame) Mapping Channel 459 460 Parameters High-Band Reference 462 Quantized Spectral flannel Indicator 440 FIG. 4 Mapping Pansmeters 466 (57) : A method includes selecting, at an encoder of a first device, a left channel or a right channel as a non-reference target channel based on a high-band reference channel indicator. The method also includes generating a synthesized non-reference high-band channel based on a non-reference high-band excitation corresponding to the non-reference target channel. The method also includes generating a high-band portion of the non-reference target channel. The method further includes estimating one or more spectral mapping parameters based on the synthesized non-reference high-band channel and the high-band portion of the non-reference target channel. The method also includes applying the one or more spectral mapping parameters to the synthesized non-reference high-band channel to generate a spectrally shaped synthesized non-reference high-band channel. The method further includes generating an encoded bitstream based on the one or more spectral mapping parameters and the spectrally shaped synthesized non-reference high-band channel. [Continued on next page] WO 2018/164805 Al MIDEDIMOMOIDEIREEMOMOHINIUMOIREOMEEN MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, 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, ST, 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, KM, ML, MR, NE, SN, TD, TG). Published: — with international search report (Art. 21(3))