Patent ID: 8255213

Claim:
A speech decoding apparatus comprising: a decoder, embodied as a processor, that decodes input encoded data to generate a decoded signal; a generator, embodied as a processor, that generates an average waveform pattern of excitation signals in a plurality of frames using an excitation signal obtained in the decoding of the encoded data; a concealed frame generator, embodied as a processor, that generates a concealed frame of a lost frame using the average waveform pattern; a switch that selects one of the decoded signal generated by the decoder and the lost frame signal generated by the concealed frame generator; and a determiner that determines whether or not the lost frame contains a voiced onset signal, wherein, when the determiner determines that the lost frame does not contain a voiced onset signal, the decoder performs CELP excitation signal concealment to generate the decoded signal, and the switch selects the decoded signal generated by the decoder, and when the determiner determines that the lost frame contains a voiced onset signal, switch selects the concealed frame generated by the concealed frame generator.