US 12,217,764 B2
Encoding method, decoding method, encoding apparatus, and decoding apparatus
Bin Wang, Shenzhen (CN); Zexin Liu, 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. 30, 2023, as Appl. No. 18/524,654.
Application 18/524,654 is a continuation of application No. 17/868,879, filed on Jul. 20, 2022, granted, now 11,869,520.
Application 17/868,879 is a continuation of application No. 16/999,448, filed on Aug. 21, 2020, granted, now 11,430,456, issued on Aug. 30, 2022.
Application 16/999,448 is a continuation of application No. 16/238,797, filed on Jan. 3, 2019, granted, now 10,770,085, issued on Sep. 8, 2020.
Application 16/238,797 is a continuation of application No. 15/677,324, filed on Aug. 15, 2017, granted, now 10,210,880, issued on Feb. 19, 2019.
Application 15/677,324 is a continuation of application No. 14/721,606, filed on May 26, 2015, granted, now 9,761,235, issued on Sep. 12, 2017.
Application 14/721,606 is a continuation of application No. PCT/CN2013/080061, filed on Jul. 25, 2013.
Claims priority of application No. 201310014342.4 (CN), filed on Jan. 15, 2013.
Prior Publication US 2024/0177722 A1, May 30, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G10L 19/03 (2013.01); G10L 19/12 (2013.01); G10L 19/26 (2013.01); G10L 21/038 (2013.01); G10L 19/00 (2013.01); G10L 19/02 (2013.01)
CPC G10L 19/03 (2013.01) [G10L 19/12 (2013.01); G10L 19/26 (2013.01); G10L 19/265 (2013.01); G10L 21/038 (2013.01); G10L 2019/0016 (2013.01); G10L 19/0204 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An encoding method, comprising:
dividing an input time domain signal into a low band signal and a high band signal;
encoding, using an algebraic code excited linear prediction (ACELP) encoder, the low band signal to obtain a low frequency encoding parameter;
obtaining an excitation signal according to the low frequency encoding parameter;
encoding the high band signal to obtain a high frequency encoding parameter;
obtaining, by passing the excitation signal through a linear predictive coding (LPC) synthesis filter, a synthesized high band signal, wherein coefficients of the LPC synthesis filter are based on the high frequency encoding parameter;
performing, using a short-term post-filter, filtering processing on the synthesized high band signal to obtain a short-time filtered signal, wherein the short-term post-filter comprises a pole-zero filter, and wherein a coefficient of the pole-zero filter is based on the high frequency encoding parameter;
calculating a z-domain transfer function of the pole-zero filter using the following formula:

OG Complex Work Unit Math
wherein Hs(z) is the z-domain transfer function, wherein a1, a2, . . . aM is an LPC coefficient, wherein M represents a quantity of the LPC coefficient, and wherein β and γ are constants that satisfy a condition 0<β<γ<1; and
calculating a high frequency gain based on the high band signal and the short-time filtered signal.