	US 11,869,520 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 Jul. 20, 2022, as Appl. No. 17/868,879.
Application 17/868,879 is a continuation of application No. 16/999,448, filed on Aug. 21, 2020, granted, now 11,430,456.
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 2022/0366922 A1, Nov. 17, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G10L 17/22 (2013.01); G10L 19/03 (2013.01); G10L 19/26 (2013.01); G10L 21/038 (2013.01); G10L 19/12 (2013.01); G10L 19/02 (2013.01); G10L 19/00 (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 19/0204 (2013.01); G10L 2019/0016 (2013.01)]

20 Claims

7. A computer program product comprising instructions stored on a non-transitory computer-readable medium that, when executed by one or more processing devices, cause the one or more processing devices to:

obtain, from encoded information corresponding to a speech signal, a low frequency encoding parameter, a linear predictive coding (LPC) parameter, and a high frequency gain;

obtain, according to the low frequency encoding parameter, a low band signal of the speech signal;

obtain, according to the low frequency encoding parameter and the LPC parameter, a synthesized high-band signal;

perform, using a pole-zero filter, filtering processing on the synthesized high-band signal, to obtain a processed synthesized high-band signal, wherein a coefficient of the pole-zero filter is based on the LPC parameter;

perform, using a first-order filter, filtering processing on the processed synthesized high-band signal to obtain a short-time filtered signal;

adjust, using the high frequency gain, the short-time filtered signal to obtain a high-band signal; and

combine the low band signal and the high-band signal to obtain a decoded signal, wherein a z-domain transfer function of the first-order filter is H_t(z)=1−μz⁻¹.