W3C home > Mailing lists > Public > www-style@w3.org > July 2011

Re: [css3-speech] voice-pitch

From: Alan Gresley <alan@css-class.com>
Date: Sat, 16 Jul 2011 17:17:20 +1000
Message-ID: <4E213B00.4040003@css-class.com>
To: Daniel Weck <daniel.weck@gmail.com>
CC: www style <www-style@w3.org>, fantasai <fantasai.lists@inkedblade.net>
On 15/07/2011 4:23 AM, Daniel Weck wrote:
> Here's my proposal:
> ---- A semitone interval corresponds to the step between each note on
> a equal temperament chromatic scale. A semitone can therefore be
> quantified as the difference between two consecutive pitch
> frequencies on such scale. The ratio between two consecutive
> frequencies separated by exactly one semitone is the twelfth root of
> two (approximately 1.05946). As a result, the value in Hertz
> corresponding to a semitone offset is relative to the initial
> frequency the offset is applied to (in other words, a semitone
> doesn't correspond to a fixed numerical value in Hertz). ----

I am very happy with this wording. It now makes sense.

Just one note. A better appropriation of the ratio between two 
consecutive frequencies (semitones) is 11011/10393 which is 1.0594631 
(limited to seven decimal places).

Alan Gresley
Received on Saturday, 16 July 2011 07:17:46 UTC

This archive was generated by hypermail 2.4.0 : Friday, 25 March 2022 10:08:02 UTC