| 摘要 |
A speech coding transmission equipment including a voiced/unvoiced detection unit (10) for distinguishing whether a speech signal is in a voiced speech or an unvoiced speech period, time domain harmonic compression and expansion units (1, 6) which, when the speech signal is in a voiced speech period, compress and expand, in the time domain, the speech signal using a pitch period of the speech signal extracted by a pitch period extraction unit (2); and decimation and interpolation units (7, 8) which, when the speech signal is in an unvoiced speech period, compress and expand, in the time domain, the speech signal using a sample period in the equipment, thus carrying out an appropriate time domain harmonic compression and expansion of the speech signal and increasing the clarity of the reproduced speech as a whole. |
