Patent ID: 7401021

Claim:
A method for voice modulation in a mobile terminal comprising: generating an analog voice signal after receiving a voice signal of a subscriber; sampling the generated analog voice signal; modulating the sampled voice signal of the subscriber by converting an instantaneous amplitude and pitch period of the sampled analog voice signal; converting the modulated voice signal into a digital signal; and processing the digital signal for compatibility for wireless transmission, wherein the modulating the sampled voice comprises: finding a largest instantaneous amplitude value E n in the sampled signal of respective phoneme; interchanging instantaneous amplitude values E n−1 and E n+1 adjacent to the largest instantaneous amplitude value E n located immediately before and immediately after on opposite sides, respectively, of the largest instantaneous amplitude value E n ; converting the pitch period of the signal; and generating an analog signal according to the converted instantaneous amplitude value and the pitch period value.