US 12,136,430 B2
Audio coding method and apparatus
Zexin Liu, Beijing (CN); Bin Wang, Shenzhen (CN); and Lei Miao, Beijing (CN)
Assigned to Top Quality Telephony, LLC, Austin, TX (US)
Filed by Top Quality Telephony, LLC, Austin, TX (US)
Filed on Aug. 27, 2021, as Appl. No. 17/458,879.
Application 17/458,879 is a continuation of application No. 16/588,064, filed on Sep. 30, 2019, granted, now 11,133,016.
Application 16/588,064 is a continuation of application No. 15/699,694, filed on Sep. 8, 2017, granted, now 10,460,741, issued on Oct. 29, 2019.
Application 15/699,694 is a continuation of application No. 15/362,443, filed on Nov. 28, 2016, granted, now 9,812,143, issued on Nov. 7, 2017.
Application 15/362,443 is a continuation of application No. PCT/CN2015/074850, filed on Mar. 23, 2015.
Claims priority of application No. 201410299590.2 (CN), filed on Jun. 27, 2014; and application No. 201410426046.X (CN), filed on Aug. 26, 2014.
Prior Publication US 2021/0390968 A1, Dec. 16, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G10L 19/032 (2013.01); G10L 19/025 (2013.01); G10L 19/06 (2013.01); G10L 19/12 (2013.01)
CPC G10L 19/12 (2013.01) [G10L 19/025 (2013.01); G10L 19/06 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An audio coding method comprising:
determining a first modification weight according to linear spectral frequency (LSF) differences of an audio frame and LSF differences of a previous audio frame of the audio frame when the audio frame is not a transition frame;
modifying a linear predictive parameter of the audio frame according to the first modification weight to generate a modified linear predictive parameter of the audio frame, wherein the first modification weight satisfies the following formula:

OG Complex Work Unit Math
wherein w[i] is the first modification weight, wherein lsf_new_diff[i] is the LSF differences of the audio frame, wherein lsf_old_diff[i] is the LSF differences of the previous audio frame, wherein i is an order of the LSF differences of the audio frame and the LSF differences of the previous audio frame, wherein a value of i ranges from 0 to M−1, and wherein M is an order of the linear predictive parameter; and
coding the audio frame according to the modified linear predictive parameter.