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Guideline 4
:
Ensure user control of rendering
Checkpoint 4.12 :
Specific synthesized speech characteristics
Allow configuration of synthesized speech pitch. Pitch refers to the average frequency of the speaking voice.
Allow configuration of synthesized speech pitch range. Pitch range specifies a variation in average frequency.
Allow configuration of synthesized speech stress. Stress refers to the height of "local peaks" in the intonation contour of the voice.
Allow configuration of synthesized speech richness. Richness refers to the richness or brightness of the voice.
Normative inclusions and exclusions
Conformance profile labels: Speech