Method for forecasting bandwidth expansion frequency band signal and decoding device

Abstract

Provided in embodiments of the present invention are a prediction method and decoding device for a bandwidth expansion frequency band signal. The method comprises: demultiplexing a received bitstream to acquire a frequency domain signal; determining whether or not the highest frequency point having bits allocated of the frequency domain signal is less than a predetermined starting frequency of a bandwidth expansion frequency band; if yes, predicting an excitation signal of the bandwidth expansion frequency band on the basis of excitation signals in a predetermined frequency band range of the frequency domain signal and of the predetermined starting frequency point of the bandwidth expansion frequency band; otherwise, predicting the excitation signal of the bandwidth expansion frequency band on the basis of the excitation signals in the predetermined frequency band range of the frequency domain signal, of the predetermined starting frequency point of the bandwidth expansion frequency band, and of the highest frequency point having bits allocated; and, predicting a bandwidth expansion frequency band signal on the basis of the predicted excitation signal of the bandwidth expansion frequency band and of a frequency domain envelope of the bandwidth expansion frequency band. The technical solution of embodiments of the present invention is capable of effectively ensuring between preceding and subsequent frames the continuity of the excitation signals predicted for the bandwidth expansion frequency band signal, thus ensuring the auditory quality of a restored bandwidth expansion frequency band signal.

Description

technical field [0001] The embodiment of the present invention relates to the field of communication technologies, and in particular to a prediction method and a decoding device for a bandwidth extension frequency band signal. Background technique [0002] In the field of digital communication, the transmission of voice, image, audio, and video has a very wide range of application requirements, such as mobile phone calls, audio and video conferences, radio and television, and multimedia entertainment. In order to reduce the resources occupied in the process of audio and video signal storage or transmission, audio and video compression coding technology emerges as the times require. In the development of audio and video compression coding technology, many different technical branches have emerged. Among them, the technology of transforming the signal from the time domain to the frequency domain and then encoding it, also known as the transform domain coding technology, has go...

AI Technical Summary

Problems solved by technology

[0008] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: use the prediction bandwidth of the prior art to expand the frequency band signal, predict the excitation signal of the high frequency band signal according to the excitation signal of the low frequency band signal, and the The excitation signals of different low-frequency band signals may be copied on the same high-frequency band signal, resulting in discontinuity of excitation, reducing the quality of the predicted bandwidth extension frequency band signal, thereby reducing the auditory quality of the audio signal

Images