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From: Lucy Greco
Date: Fri, Jan 06 2012 10:00AM
Subject: webanares showing a screen reader problems
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Hello:
I have been asked to give several presentations of how a blind person uses the web. The presentations have both blind and sited participants so I have also been asked to share my screen. Here's where the fun starts. The people that want me to give the presentations use blackboard aluminate. But I think the problem is more systemic then that.
I am using a good hi end mike plugged in to a USB mixer I am also using the same mixer For the screen reader. I am using a second sound card on the same computer. And sending the signal from that sound card to the same mixer. Everything sounds grate the mike is working and the screen reader sounds good and as soon as I open the meeting room I get a horrible hi pitched squeak. That I can't get rid of.
The reason I don't think it is aluminate is that I get the same squeak in sound recorder.

I thought I would see if any of you have ideas how to fix this. I really need to get this worked out as we are going to try and record a event later today.
I am running windows 7 64. The mixer behaves just like a USB sound card and the mixer is only get the mike input form for the meeting the audio is coming out of the head phone of the cpu . thanks Lucy


Lucy Greco
Assistive Technology Specialist
Disabled Student's Program UC Berkeley
(510) 643-7591
http://attlc.berkeley.edu
http://webaccess.berkeley.edu

From: Jared Smith
Date: Fri, Jan 06 2012 10:21AM
Subject: Re: webanares showing a screen reader problems
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On Fri, Jan 6, 2012 at 9:59 AM, Lucy Greco wrote:
> Everything sounds grate the mike is working and the screen reader sounds good and as soon as I open the meeting room I get a horrible hi pitched squeak.

This post is rather off-topic, but...

It sounds like a basic feedback loop to me. The microphone is picking
up the audio, and when the presentation software opens, it plays the
microphone audio, which the microphone then picks up again and
amplifies over and over until it's just a squeal. You might be able to
address this by changing settings to ensure that your own microphone
audio never plays through the speakers. I can't give you specific
directions as you have a fairly complicated set up, but that seems to
be the general issue. Or simply use headphones rather than your
speakers.

Jared

From: Giovanni Duarte
Date: Fri, Jan 06 2012 10:51AM
Subject: Re: webanares showing a screen reader problems
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Jared is right. Another tip is to mute the "speakers" in the Elluminate
platform and try that. I used to be an Elluminate administrator and this was
a common "audio feedback" issue. You mentioned to get the same sound when
you recorded the audio. If this is the case, you may need to tweak the
settings in your mixer.
Giovanni