To improve a feeling of break that occurs when the signal, which has received non-linear quantization through the echo canceller of a digital mobile phone or the like, is outputted as voice.

A digital voice processing device has a non-linear processing means which generates and outputs a non-linear quantizing signal by removing minute noise having a low amplitude level from an inputted quantizing signal based on a quantization level. In this case, a correspondence-noise generating means 103, a operational state-indicating means which outputs the operational state of the non-linear quantizing means, a voice route parameter-memorizing means 107, a synthesis-filtering means 108 and an adding means 110 are provided. The feeling of break is improved by adjusting the tone color of a background noise before and behind the part from which the minute noise is removed by the non-linear processing means.