| 摘要 |
PROBLEM TO BE SOLVED: To improve the quality of a reproduced speech signal by controlling a mixed amount of a speech signal received in the case of reproducing a speech and a 3rd signal at a receiver side corresponding to a voiced sound period, a hang-over period and a silence period so as to eliminate unnaturality of switching between the voiced part and the silence part to the utmost. SOLUTION: While voice/hang-over/silence identification 902 indicates a voiced sound, a voice sound level adjustment section 903 gives no loss to a voice digital signal 901 to improve the articulation but gives a large loss to an output of a 3rd signal level adjustment section 905 and mixes both the outputs. On the other hand, the section 903 controls the mixed amount so that the speech signal is smaller gradually and the 3rd signal is increased gradually up to a background noise level so as to smooth a change in a silence during the hand-over period. When the voice/hang-over/silence identification 902 indicates a silence, the section 903 sets the 3rd signal to the background noise level.
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