Audio time axis compression device and audio time base expansion device, and audio time axis compression expansion device

摘要

PURPOSE: To develop a voice compression and expansion system by which a voice waveform small in displacement and distortion can be obtained even when the compression/expansion ratio is close to 1. CONSTITUTION: When a voice signal is compressed and voice signal waveforms F and G whose lengths are =2 times as large a pitch cycles and integral multiples are cut from both the position P1 of the current pointer of the inputted voice signal waveform and the position P2 which is one pitch cycle precedent to the pointer, and a couple of cut voice signal waveforms are weighted with proper W1 and W2 and added to generate one signal waveform E by compressing the two voice signal waveforms, and, the current pointer P1 is moved ON the inputted voice signal waveform corresponding to compressibility to obtain a pointer P4 and similar operation is performed to obtain a compressed voice signal.