Novel programmable wave-SC filter structure for pole-zero modelling of vocal tract

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Novel programmable wave-SC filter structure for pole-zero modelling of vocal tract

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Published

In the letter a novel programmable wave-SC filter structure is presented which is suitable for implementation of a LPC vocoder including transmission zeros. Owing to distributed arithmetic five basic cells and two new slightly modified cells, which correspond to the nasal branch, are required for the entire SC vocoder. Each cell contains one programmable capacitor array and the capacitive loading of all op-amps is constant. The latter essentially simplifies the op-amp design and allows the use of low-power dynamic amplifiers. The presented structure employs only fully stray-insensitive SC-amphfier and integrator circuits and offers a low sensitivity to coefficient quantisation.

Inspec keywords: vocoders; switched capacitor networks; speech synthesis; switched filters; poles and zeros

Other keywords: switched-capacitor filters; programmable capacitor array; distributed arithmetic; capacitive loading; stray-insensitive SC-amplifier; programmable wave-SC filter; coefficient quantisation; low-power dynamic amplifiers; LPC vocoder; transmission zeros

Subjects: Active filters and other active networks; Speech and audio signal processing; Speech recognition and synthesis equipment

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