Patent SG-11201907670U-A (SG)
Title: Inter-channel bandwidth extension
Inventor: CHEBIYYAM VENKATA SUBRAHMANYAM CHANDRA SEKHAR
IPC: G10L21/038
Filed: 2018-03-27
Abstract: AnalysisData Final Shift Value 116 First Device 104 Memory 153 Transmitter 110 Input Interface(s) 112 Encoder 114 First Audio Channel 130 First Microphone 146 Second Audio Channel 132 Second Microphone 148 Sound Source 152 Second Device r 118 Decoder ICBWE Spatial Gain Mapping Parameter Generator M 106 N. First Output Channel 126 First Loudspeaker 142 Seco d Loudspeaker 144 Second Output — Channel 128 (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (43) International Publication Date 11 October 2018 (11.10.2018) WIPO I PCT olimion °nolo mol mons mionflom oimIE (10) International Publication Number WO 2018/187082 Al (51) International Patent Classification: G10L 19/008 (2013.01) G1 0L 21/038 (2013.01) (21) International Application Number: PCT/US2018/024500 (22) International Filing Date: 27 March 2018 (27.03.2018) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: 62/482,150 05 April 2017 (05.04.2017) US 15/935,952 26 March 2018 (26.03.2018) 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; 590 Mill Creek Lane, #205, Santa Clara, California 95054 (US). ATTI, Venkatraman; 5775 More- house Drive, San Diego, California 92121-1714 (US). (74) Agent: TOLER, Jeffrey G. et al.; Toler Law Group, PC, 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, 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, (54) Title: INTER-CHANNEL BANDWIDTH EXTENSION 100 Stereo Downmix/Upmix Parameter Bitstream 290 Low-Band Mid Channel Bitstream 292 High-Band Mid Channel BWE Bitstream 294 Stereo Downmix/Upmix Parameter Bitstream 290 Low-Band Mid Channel Bitstream 292 High-Band Mid Channel BWE Bitstream 294 1-1 N GC O N GC 1-1 00 O 1-1 N O FIG. 1 (57) : A method includes decoding a low-band mid channel bitstream to generate a low-band mid signal and a low-band mid excitation signal. The method further includes decoding a high-band mid channel bandwidth extension bitstream to generate a synthesized high-band mid signal. The method also includes determining an inter-channel bandwidth extension (ICBWE) gain mapping parameter corresponding to the synthesized high-band mid signal. The ICBWE gain mapping parameter is based on a selected frequen- cy-domain gain parameter that is extracted from a stereo downmix/upmix parameter bitstream. The method further includes performing a gain scaling operation on the synthesized high-band mid signal based on the ICBWE gain mapping parameter to generate a reference high-band channel and a target high-band channel. The method includes outputting a first audio channel and a second audio channel. The first audio channel is based on the reference high-band channel, and the second audio channel is based on target high-band channel. [Continued on next page] WO 2018/187082 Al 0 1OIIIIIII 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))