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i am using nuance dragon mobile sdk for iPhone, for using text to speech.
The readed text is a little bit to fast and i want to make it slower, so the user can learn the words. My aim is to slow down the text a bit. That works very fine with SSML and prosody tag, see this code: 

<prosody rate="slow">This is the text which is spoken slow,
but the voice sounds distorted/warped/ghastly</prosody>

The voice sounds distorted, warped and ghastly.
Do you understand what i mean?
What can i do to get a clear voice but slow speaked text?

brush51
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  • Is there a way to do this without "nuance dragon mobile sdk"? It appears that SSML is not supported by AVSpeechSynthesizer. – ryanwebjackson Aug 20 '20 at 20:55

1 Answers1

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taken from here: http://www.w3.org/TR/speech-synthesis/#S3.2.4

rate: a change in the speaking rate for the contained text. Legal values are: 
a relative change or "x-slow", "slow", "medium", "fast", "x-fast", or "default". 
Labels "x-slow" through "x-fast" represent a sequence of monotonically non-decreasing
speaking rates. When a number is used to specify a relative change it acts as a 
multiplier of the default rate. For example, a value of 1 means no change in speaking 
rate, a value of 2 means a speaking rate twice the default rate, and a value of 0.5 
means a speaking rate of half the default rate. The default rate for a voice depends on 
the language and dialect and on the personality of the voice. The default rate for a 
voice should be such that it is experienced as a normal speaking rate for the voice when 
reading aloud text. Since voices are processor-specific, the default rate will be as 
well.
brush51
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