Multi-channel digital speech synthesizer

Details Multi-channel digital speech synthesizer Multi-channel digital speech synthesizer

G - Physics

10

L

354/47

G10L 19/00 (2006.01) G10L 11/00 (2006.01)

Patent

CA 1127763

ABSTRACT OF THE DISCLOSURE A multi-channel digital speech-synthesizer comprises a lattice filter simulating the vocal tract and generating speech samples by processing samples of periodic or random waveforms, supplied by respective generators, dependent on whether the vocal-tract configuration is in respect of a voi- ced or an unvoiced sound. Such processing occurs on the basis of co-efficients supplied by an external unit which stores a set of parameters which characterize elements permitting the build-up of a dictionary that can be synthesized. The para- meters comprise, besides the co-efficients, the duration of the respective validity intervals, information on whether the sound is voiced or unvoiced, the pitch period in the case of periodic excitation, and the intensity of the sound to be syn- thesized. The generators and filter are connected with the external unit through a plurality of input modules, and a con- trol unit acting as an interface towards the external unit. The input modules control the transfer of the parameters from the external unit to the generators, by requesting the external unit for a set of parameters at the end of each validity inter- val, temporarily storing the set of parameters, and updating the filter co-efficients at the beginning of every pitch period of a voiced sound, and at the beginning of a validity interval following an unvoiced sound. The control unit is able to se- lect the input module for which the set of parameters is inten- ded and to store the requests for new parameters coming from the various channels and send them to the external unit.

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