PREDICTION METHOD AND DECODING DEVICE FOR BANDWIDTH EXPANSION BAND SIGNAL

摘要

Embodiments of the present invention provide a method for predicting a bandwidth extension frequency band signal, and a decoding device. The method includes: demultiplexing a received bitstream to obtain a frequency domain signal; determining whether a highest frequency bin, to which a bit is allocated, of the frequency domain signal is less than a preset start frequency bin of a bandwidth extension frequency band; when it is less, predicting an excitation signal of the bandwidth extension frequency band according to an excitation signal within a predetermined frequency band range of the frequency domain signal and the preset start frequency bin of the bandwidth extension frequency band; otherwise, predicting the excitation signal of the bandwidth extension frequency band according to the excitation signal within the predetermined frequency band range of the frequency domain signal, the preset start frequency bin of the bandwidth extension frequency band, and the highest frequency bin to which a bit is allocated; and predicting the bandwidth extension frequency band signal according to the predicted excitation signal of the bandwidth extension frequency band and a frequency envelope of the bandwidth extension frequency band. The technical solutions of the embodiments of the present invention can effectively ensure continuity of predicted excitation signals that are of a bandwidth extension frequency band signal and between a former frame and a latter frame, thereby ensuring auditory quality of a restored bandwidth extension frequency band signal.