Patent ID: 11900954
Assignee: TENCENT TECHNOLOGY (SHENZHEN) COMPANY LIMITED
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 2:
3. The method according to claim 2, wherein performing the time-frequency transform comprises:
performing short-term Fourier transform (STFT) on the historical voice frame, to obtain a plurality of sets of STFT coefficients corresponding to the historical voice frame; and
using the frequency-domain coefficient or an amplitude spectrum extracted from the frequency-domain coefficient as the frequency-domain characteristic of the historical voice frame comprises:
performing any one of:
using the plurality of sets of STFT coefficients as the frequency-domain characteristic of the historical voice frame; and
forming an amplitude coefficient sequence according to amplitude spectra corresponding to at least some of the STFT coefficients in each set of STFT coefficients, and using the amplitude coefficient sequence as the frequency-domain characteristic of the historical voice frame.