| 摘要 |
PURPOSE:To input voices in frames and perform waveform thinning processes at every pitch in real time by accumulating the voices after encoding and reading out and decoding the accumulated encoded voices, and then, thinning waveforms at every pitch of the voices. CONSTITUTION:A power process circuit PER reads out the voice waveform of a frame waveform memory M3 and calculates the power of a frame and outputs a voice frame in the form of a flag (VUF) by discriminating that the frame to be outputted is the voice frame when the power exceeds a preset threshold. When the power does not reach the threshold, the circuit PWR outputs a soundless or voiceless frame in the form of the flag (VUH) by discriminating that the frame to be outputted is the soundless or voiceless frame. A thinning process circuit TDS thins the waveforms at every pitch NP by reading out voice waveforms from memories M4 and M3 and restores the remaining reside waveform in the memory M4. Thus the voices are accumulated after encoding and the accumulated encoded voices are read out, decoded, and outputted through a D/A converter circuit 5 after thinning waveforms at every pitch of the voices. Therefore, voices can be inputted in frames and waveform thinning can be performed at every pitch in real time. |
