Some Sources of Characteristic Vocoder Quality

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Abstract
The voice quality typical of channel vocoders has been variously characterized, not always in complimentary terms. A preliminary study has isolated some of the factors which appear to contribute undesirable effects. One of these effects (referred to as roughness) is traceable to low frequency modulation or jitter of the pulses in the buzz signal employed in synthesizing voiced sounds. Another (referred to as reediness) appears to be caused by a general leveling of the instantaneous spectrum of the output speech. Other attributes, which become prominent when a vocoder is used as the synthesizing component of a bandwidth compression system, have been studied also. Experimental results and remedial measures will be discussed and illustrated by recordings. [This work was supported in part by the Carnegie Corporation of New York and in part by the Department of Defense in connection with Contract DA49-170-sc-1642.]

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