Pitch detector system and pitch detector and pitch detection method

摘要

An improved pitch detector system for use with speech analysis and synthesis methods having a plurality of identical detectors (107, 108, 109, 110) each responsive to a different portion of a speech signal for estimating a pitch value and a voter circuit (111) responsive to the estimated pitch values for determining a final pitch value. The pitch detectors are identical in design which allows for an efficient software implementation since only one set of program instructions is necessary to implement all of the encoders. The voter subsystem may be implemented by a digital signal processor executing program instructions that calculate a pitch value from the estimated pitch values determined by the pitch detectors and a second set of program instructions for constraining the final pitch value outputted by the voter subsystem so that the calculated pitch value is in agreement with calculated pitch values for previous frames. In addition, the pitch and voters may be implemented by a third set of program instructions executing on the same digital signal processor as the sets of instructions for the voter subsystem.