Audio signal enhancement method and apparatus, computer device, storage medium and computer program product

A computer device, comprising a memory and a processor, the memory storing a computer program, and the processor, when executing the computer program, implementing operations comprising:

• decoding received speech packets sequentially to obtain a residual signal, long term filtering parameters and linear filtering parameters;
• filtering the residual signal to obtain an audio signal;
• extracting a feature parameter from the audio signal, when the audio signal is a feedforward error correction frame signal;
• converting the audio signal into a filter speech excitation signal based on the linear filtering parameters;
• performing speech enhancement on the filter speech excitation signal according to the feature parameter, the long term filtering parameters and the linear filtering parameters to obtain an enhanced speech excitation signal, comprising:
• vectorizing the feature parameter, the long term filtering parameters and the linear filtering parameters, and concatenating the vectorization results to obtain a feature vector;
• inputting the feature vector and the filter speech excitation signal into a pre-trained signal enhancement model;
• performing feature extraction on the feature vector by the pre-trained signal enhancement model to obtain a target feature vector;
• and
• enhancing the filter speech excitation signal based on the target feature vector to obtain the enhanced speech excitation signal;
• and
• performing speech synthesis to obtain an enhanced speech signal based on the enhanced speech excitation signal and the linear filtering parameters.

A non-transitory computer-readable storage medium, storing a computer program, the computer program, when executed by a processor, causing the processor to implement:

• decoding received speech packets sequentially to obtain a residual signal, long term filtering parameters and linear filtering parameters;
• filtering the residual signal to obtain an audio signal;
• extracting a feature parameter from the audio signal, when the audio signal is a feedforward error correction frame signal;
• converting the audio signal into a filter speech excitation signal based on the linear filtering parameters;
• performing speech enhancement on the filter speech excitation signal according to the feature parameter, the long term filtering parameters and the linear filtering parameters to obtain an enhanced speech excitation signal, comprising:
• vectorizing the feature parameter, the long term filtering parameters and the linear filtering parameters, and concatenating the vectorization results to obtain a feature vector;
• inputting the feature vector and the filter speech excitation signal into a pre-trained signal enhancement model;
• performing feature extraction on the feature vector by the pre-trained signal enhancement model to obtain a target feature vector;
• and
• enhancing the filter speech excitation signal based on the target feature vector to obtain the enhanced speech excitation signal;
• and
• performing speech synthesis to obtain an enhanced speech signal based on the enhanced speech excitation signal and the linear filtering parameters.