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Abstract

In a digital text-to-speech conversion system of the type usually contained in all-software form on a floppy disk, memory requirements are reduced while speech quality is improved, by providing compression techniques and anti-distortion techniques which interact to provide clear speech at widely varying speeds with a minimum of memory. These techniques include using Huffman coding to advantage by encoding only differences between successive waveforms where feasible, relocating delta tables and using them repetitively, using a demi-diphone organization of the speech to allow use of the same instruction lists for several sounds; and combining selective deletion or repetition of waveforms with selective interpolation to vary speed without slurring.

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First Claim