From http://www.w3schools.com (Copyright Refsnes Data)
The pitch property is used only in Aural Stylesheets.
The aural rendering of a document combines sounds and voices to go through the content of a document. Aural presentation occurs often by converting the document to plain text and then feeding this to a screen reader.
Situations and markets for listening to information could be:
The pitch property specifies the average pitch (a frequency) of the speaking voice.
The average pitch depends on the voice family. The average pitch for a male voice is 120Hz, and for a female voice, it's 210Hz.
| Value | Description |
|---|---|
| frequency | The average pitch of the speaking voice is specified in hertz |
| x-low | Defines an extra low frequency (the value depend on the voice family) |
| low | Defines a low frequency (the value depend on the voice family) |
| medium | Default. Defines a medium frequency (the value depend on the voice family) |
| high | Defines a high frequency (the value depend on the voice family) |
| x-high | Defines an extra high frequency (the value depend on the voice family) |
From http://www.w3schools.com (Copyright Refsnes Data)