Patent ID: 6134519
Filing Date: 2000-10-17
Classification: G10L

Abstract:
A voice encoder comprising:a voiced-unvoiced detector for judging whether or not an input audio signal includes voice in each frame of the input audio signal to output a voiced-unvoiced signal,a pitch analyzer for extracting pitch information from the input audio signal,a signal selector for receiving said voiced-unvoiced signal and said pitch information and, in response to said voiced-unvoiced signal, selectively outputting either a first signal including the input audio signal and the pitch information or a second signal including the input audio signal with at least a part of the pitch information being invalidated depending on said voiced-unvoiced signal,a high-efficiency encoder for encoding the first signal or the second signal to generate first data or second data, anda data selector for selectively transmitting either said first data during a voiced state of the input audio signal, or said second data and subsequently stopping transmission when an unvoiced state of the input audio signal is detected subsequent to a voiced state.