| 摘要 |
Embodiments of the present invention provide a coding/decoding method, apparatus, and system. According to the coding method, de-emphasis processing is performed on a full band signal by using a de-emphasis parameter determined according to a characteristic factor of an input audio signal, and then the full band signal is coded and sent to a decoder, so that the decoder performs corresponding de-emphasis decoding processing on the full band signal according to the characteristic factor of the input audio signal and restores the input audio signal. This resolves a prior-art problem that an audio signal restored by a decoder is apt to have signal distortion, and implements adaptive de-emphasis processing on the full band signal according to the characteristic factor of the audio signal to enhance coding performance, so that the input audio signal restored by the decoder has relatively high fidelity and is closer to an original signal. |
| 主权项 |
1. A coding method, comprising:
coding, by a coder, a low frequency band signal of an input audio signal to obtain one or more characteristic factors of the input audio signal; performing, by the coding apparatus, coding and spread spectrum prediction on a high frequency band signal of the input audio signal to obtain a first full band signal; performing, by the coder, de-emphasis processing on the first full band signal, wherein a de-emphasis parameter of the de-emphasis processing is determined according to the one or more characteristic factors; calculating, by the coder, a first energy of the first full band signal that has undergone de-emphasis processing; performing, by the coder, band-pass filtering processing on the input audio signal to obtain a second full band signal; calculating, by the coder, a second energy of the second full band signal; calculating, by the coder, an energy ratio of the second energy of the second full band signal to the first energy of the first full band signal; and sending, by the coder to a decoder, a bitstream resulting from coding the input audio signal, wherein the bitstream comprises the one or more characteristic factors, high frequency band coding information, and the energy ratio of the input audio signal. |
