US 9,812,143 B2
Audio coding method and apparatus
Zexin Liu, Beijing (CN); Bin Wang, Beijing (CN); and Lei Miao, Beijing (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed on Nov. 28, 2016, as Appl. No. 15/362,443.
Application 15/362,443 is a continuation of application No. PCT/CN2015/074850, filed on Mar. 23, 2015.
Claims priority of application No. 2014 1 0299590 (CN), filed on Jun. 27, 2014; and application No. 2014 1 0426046 (CN), filed on Aug. 26, 2014.
Prior Publication US 2017/0076732 A1, Mar. 16, 2017
Int. Cl. G10L 19/00 (2013.01); G10L 21/00 (2013.01); G10L 19/08 (2013.01); G10L 19/12 (2013.01); G10L 19/06 (2013.01); G10L 19/025 (2013.01)
CPC G10L 19/12 (2013.01) [G10L 19/025 (2013.01); G10L 19/06 (2013.01)] 25 Claims
OG exemplary drawing
 
1. An audio coding method comprising:
obtaining an audio signal;
performing linear prediction analysis on the audio signal to obtain a linear predictive parameter of a current frame of the audio signal;
determining a first modification weight according to linear spectral frequency (LSF) differences of the current frame of the audio signal and LSF differences of a previous frame of the current frame of the audio signal, when a signal characteristic of the current frame and a signal characteristic of the previous frame meet a preset modification condition, wherein determining the first modification weight according to LSF differences of the current frame and LSF differences of the previous frame of the current frame of the audio signal comprises determining the first modification weight according to the LSF differences of the current frame and the LSF differences of the previous frame according to

OG Complex Work Unit Drawing
wherein w[i] is the first modification weight, wherein lsf_new_diff[i] is the LSF differences of the current frame, wherein lsf_old_diff[i] is the LSF differences of the previous frame, wherein a value of i ranges from 1 to M−2, and wherein M is an order of the linear predictive parameter;
modifying the linear predictive parameter of the current frame according to the determined first modification weight; and
coding the current frame according to the modified linear predictive parameter.