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Re: Screen Readers | Rate = Words Per Minute

From: Christophe Strobbe <strobbe@hdm-stuttgart.de>
Date: Thu, 11 May 2017 20:12:57 +0200
To: w3c-wai-ig@w3.org
Message-ID: <a94ae200-ecf3-b3ac-c261-19552f09ec71@hdm-stuttgart.de>

On 11/05/2017 19:42, Wright, Isaiah wrote:
>
> This is great Christophe. If I understand the formulas correctly –
> then the fastest rate (100%) for NVDA using eSpeak is 310 WPM (of
> course, that is you are not using the rate boost check box)?
>
I ignored rateboost (which only applies to eSpeak, as far as I know).
Also, when I was looking for conversion formulas, I found different
values for eSpeak's minRate and maxRate. One document said 80 and 390,
respectively, while another said 80 and 450, respectively. With the
first set of values, you reach 310 wpm when the NVDA rate is set to 75.
I can send a spreaksheet (ODF format) off-list if you like.

Best regards,

Christophe


>  
>
> Thanks!
>
>  
>
> *Isaiah M. Wright*
>
> Usability Research  | Integrated Channels & Experience
>
> 440 S. Church St., Charlotte NC 28202
>
> T + 704 444 4694  |  isaiah.wright@ally.com
>
> image001.gif
>
>  
>
> *From:*Christophe Strobbe [mailto:strobbe@hdm-stuttgart.de]
> *Sent:* Thursday, May 11, 2017 11:55 AM
> *To:* w3c-wai-ig@w3.org
> *Subject:* Re: Screen Readers | Rate = Words Per Minute
>
>  
>
> Hi,
>
> On 9/05/2017 16:51, Wright, Isaiah wrote:
>
>     (...)* *
>
>     I have access to NVDA but the rate is by percentage instead of
>     words per minute. Is there a chart out there that translates rate
>     percentage into words per minute?
>
>
> If you really need conversion formulas, here is the best I found for NVDA:
>
> (nvdaRate / 100) * (maxRate - minRate) + minRate = wpm (with with
> maxrate = 390 and minrate = 80)
> This formula assumes eSpeak; it may not be a very good approximation
> for other TTS engines.
>
> For Orca, I have used the following two formulas:
> (1) wpm = eSpeakNormalRate + (eSpeakNormalRate - eSpeakMinRate) *
> (r-50) / 50
> (2) wpm = eSpeakNormalRate + (eSpeakMaxRate - eSpeakNormalRate) *
> (r-50) / 50
> where:
> * r = Orca’s speech rate value
> * eSpeakNormalRate = eSpeak’s normal speed on GNOME; here = 160
> * eSpeakMinRate = eSpeak’s minimum speed on GNOME; here = 80
> * eSpeakMaxRate = eSpeak’s maximum speed on GNOME; here = 310
>
> The first formula is used for Orca speech rates lower than 50; the
> second is used when Orca's speech rate is 50 or higher.
>
> Warning: I have not checked the accuracy of these formulas since April
> 2014.
>
> Best regards,
>
> Christophe Strobbe
>
>
>      
>
>     Cheers,
>
>     *Isaiah M. Wright*
>
>     Usability Research  | Integrated Channels & Experience
>
>     440 S. Church St., Charlotte NC 28202
>
>     T + 704 444 4694  |  isaiah.wright@ally.com
>     <mailto:isaiah.wright@ally.com>
>
>     image001.gif
>
>  
>
>  
>
> -- 
> Christophe Strobbe
> Akademischer Mitarbeiter
> Responsive Media Experience Research Group (REMEX)
> Hochschule der Medien
> Nobelstraße 10
> 70569 Stuttgart
> Tel. +49 711 8923 2749
>  
> “I drink tea and I know things.” 
> Falsely attributed to Christophe Lannister.


-- 
Christophe Strobbe
Akademischer Mitarbeiter
Responsive Media Experience Research Group (REMEX)
Hochschule der Medien
Nobelstraße 10
70569 Stuttgart
Tel. +49 711 8923 2749

“I drink tea and I know things.” 
Falsely attributed to Christophe Lannister.
Received on Thursday, 11 May 2017 18:13:35 UTC

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