NOISE-FEEDBACK FOR SPECTRAL ENVELOPE QUANTIZATION

摘要

A method of transmitting an input audio signal (32) is disclosed. A current spectral magnitude of the input audio signal (32) is quantized. A quantization error of a previous spectral magnitude is fed back to influence quantization of the current spectral magnitude. The feeding back includes adaptively modifying a quantization criterion to form a modified quantization criterion. A current quantization error is minimized by using the modified quantization criterion. A quantized spectral envelope is formed based on the minimizing and the quantized spectral envelope is transmitted.