| 摘要 |
A speech communication unit (100) comprises a speech decoder (134) having a receiver for receiving at least a first substantially periodic waveform and a second non-periodic waveform. An adjustment function 324, operably coupled to the receiver, adjusts an amplitude of the second non-periodic waveform. Preferably, the amplitude adjustment is performed using a high-pass filter and/or a high frequency boost. By adjusting an amplitude of a non-periodic portion of a speech signal, preferably of non-periodic components of a Kalman speech coder, an improvement in the quality of the synthesised speech can be achieved without an increase in delay or bit-rate. Also described is phase adjustment of the non-periodic waveform for smoothing fricatives. |
