| 摘要 |
<p>A speech vocoder device and corresponding method parameterizes speech excitation waveforms. An analysis portion performs an excitation pulse compression process (46) which filters (64, 66, 68) an excitation template to produce compressed excitation from which excitation parameters are estimated (74). An optimal excitation target is selected using a closed-loop process (48) that selects the target based on a minimum error (158) between the original waveform and waveforms created by interpolating (156) between candidate targets. An adaptive excitation weighting function is created (178) based on the excitation target's features and a preselected characterization methodology, and the function is applied (180) to the excitation target. The excitation is characterized (52) and encoded (54) for digital transmission.</p> |
