Communication apparatus for adjusting a voice signal

A communication apparatus for adjusting a voice signal received from another communication apparatus in accordance with an ambient noise, the communication apparatus comprising:

• a microphone for receiving the ambient noise and input voice and outputting a voice input signal corresponding to a level of the input voice and the ambient noise;
• a receiver for receiving the voice signal from the another communication apparatus;
• a processer for extracting, from the voice input signal, a voice component originated by a sender and an ambient noise component originated by the ambient noise, determining a ratio between the voice component and the ambient noise component, and adjusting an amplitude of the received voice signal in accordance with the ratio;
• and
• a speaker for outputting a reception voice corresponding to the adjusted reception voice signal,
• wherein the processer judges presence or absence of a difference between an average of a normal statistic and an average of a deterioration statistic, and calculates the difference in a characteristic amount characterizing the voice input signal between cases where a ratio is larger than a predetermined threshold value and smaller than the predetermined threshold value depending on the presence or absence of the difference, the normal statistic and the deterioration statistic being determined based on a normal status and a deterioration status of the received voice signal.