[Micronet] fun with audio

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[Micronet] fun with audio

Lucy Greco
Hello:
 I have been asked to give several presentations of how a blind person uses
the web. The presentations have both blind and sited partisapents 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 the same wireless mikes that BPAG uses for the mikes . And am
piping it in to a USB mixer. For the  screen reader part 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 scweek in
sound recorder.

I thought I would see if any of you have ideas how to fix this. it is not a
Berkeley project but the seminars could be used by our students in the
future as they will be streamed live for free.
If anyone has an idea about how to fix this I would love to offer dinner if
you could help. thanks Lucy


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



 
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Re: [Micronet] fun with audio

Bruce Satow
Hi Lucy,

I'm not sure about this, but it sounds like a feedback problem.  If you can't adjust the placement of the microphones, it is said that one can use an equalizer to try and lower the frequencies causing the squeak or a noise gate or a filter.  Unfortunately, I'm not an expert on audio engineering, but I hope this might provide some clues on obtaining a solution.  There's also something out there called a "digital feedback eliminator".  I'm not sure how that works, but that might be a clue too...

Good luck,
Bruce.



On 1/6/2012 8:41 AM, lucia greco wrote:
Hello:
 I have been asked to give several presentations of how a blind person uses
the web. The presentations have both blind and sited partisapents 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 the same wireless mikes that BPAG uses for the mikes . And am
piping it in to a USB mixer. For the  screen reader part 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 scweek in
sound recorder. 

I thought I would see if any of you have ideas how to fix this. it is not a
Berkeley project but the seminars could be used by our students in the
future as they will be streamed live for free. 
If anyone has an idea about how to fix this I would love to offer dinner if
you could help. thanks Lucy 


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



 
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Messages you send to this mailing list are public and world-viewable, and the list's archives can be browsed and searched on the Internet.  This means these messages can be viewed by (among others) your bosses, prospective employers, and people who have known you in the past.


--
Bruce Satow
University of California at Berkeley
Space Sciences Laboratory
7 Gauss Way
Berkeley, California 94720-7450
[hidden email]
(510) 643-2348

"If the United States of America or Britain is having elections, they don't ask for observers from Africa or from Asia. But when we have elections, they want observers" - Nelson Mandela



 
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Re: [Micronet] fun with audio

Jay Bryon
In reply to this post by Lucy Greco
Since I'm not sure of what your setup looks like, this is a total guess,
but you may have a configuration problem that is looping your audio from
the meeting back into your pc, which then goes back out to the meeting,
resulting in feedback.

Since you're already using an equalizer, you can try to cut the high end
to see if that helps, but it may be that you need to configure your
sound to break the feedback loop entirely.

-J

On 1/6/12 8:41 AM, lucia greco wrote:

> Hello:
>   I have been asked to give several presentations of how a blind person uses
> the web. The presentations have both blind and sited partisapents 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 the same wireless mikes that BPAG uses for the mikes . And am
> piping it in to a USB mixer. For the  screen reader part 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 scweek in
> sound recorder.
>
> I thought I would see if any of you have ideas how to fix this. it is not a
> Berkeley project but the seminars could be used by our students in the
> future as they will be streamed live for free.
> If anyone has an idea about how to fix this I would love to offer dinner if
> you could help. thanks Lucy
>
>
> Lucy Greco
> Assistive Technology Specialist
> Disabled Student's Program UC Berkeley
> (510) 643-7591
> http://attlc.berkeley.edu
> http://webaccess.berkeley.edu
>
>
>
>
> -------------------------------------------------------------------------
> The following was automatically added to this message by the list server:
>
> To learn more about Micronet, including how to subscribe to or unsubscribe from its mailing list and how to find out about upcoming meetings, please visit the Micronet Web site:
>
> http://micronet.berkeley.edu
>
> Messages you send to this mailing list are public and world-viewable, and the list's archives can be browsed and searched on the Internet.  This means these messages can be viewed by (among others) your bosses, prospective employers, and people who have known you in the past.
>

--
Jay Bryon
Senior Network Engineer, U.C. Berkeley/IST/IS/Network Operations and Services
[hidden email]
2-5636

"An expert is a man who has made all the mistakes which can be made in a very narrow field."
-Niels Bohr,
   Danish physicist

[Unless stated explicitly otherwise, all opinions are my own and do not represent official policy of any part of IST, U.C. Berkeley or the U.C. Regents]


 
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http://micronet.berkeley.edu

Messages you send to this mailing list are public and world-viewable, and the list's archives can be browsed and searched on the Internet.  This means these messages can be viewed by (among others) your bosses, prospective employers, and people who have known you in the past.
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Re: [Micronet] fun with audio

Lucy Greco-2
Hello:
 Thanks to all of you that responded. I was able to get a good sound after about an hour or two more   of fighting with it on Friday. What I needed to do was add a third sound system to the setup. So I added a Logitech USB head set. Now I am getting meeting sound from the Logitech and the system sound for jaws was going in to the  mixer and my mike was plugged in to the mixer. Then I fiddled with the mid and hi ends on the jaws sound and turned the high end down on the mike and at last it was a clean sound. Boy there's a lot more to sound then I knew. The mixer lets me adjust two mids a hi and a low. Then it offers left and write balance and two effect channels . it is way over kill for what I need but it sure helped for trubleshoutting . . thanks every one for all your comments it really helps micronet is one of the best things on campus Lucy


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


-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Jay Bryon
Sent: Friday, January 06, 2012 4:08 PM
To: [hidden email]
Subject: Re: [Micronet] fun with audio

Since I'm not sure of what your setup looks like, this is a total guess,
but you may have a configuration problem that is looping your audio from
the meeting back into your pc, which then goes back out to the meeting,
resulting in feedback.

Since you're already using an equalizer, you can try to cut the high end
to see if that helps, but it may be that you need to configure your
sound to break the feedback loop entirely.

-J

On 1/6/12 8:41 AM, lucia greco wrote:

> Hello:
>   I have been asked to give several presentations of how a blind person uses
> the web. The presentations have both blind and sited partisapents 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 the same wireless mikes that BPAG uses for the mikes . And am
> piping it in to a USB mixer. For the  screen reader part 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 scweek in
> sound recorder.
>
> I thought I would see if any of you have ideas how to fix this. it is not a
> Berkeley project but the seminars could be used by our students in the
> future as they will be streamed live for free.
> If anyone has an idea about how to fix this I would love to offer dinner if
> you could help. thanks Lucy
>
>
> Lucy Greco
> Assistive Technology Specialist
> Disabled Student's Program UC Berkeley
> (510) 643-7591
> http://attlc.berkeley.edu
> http://webaccess.berkeley.edu
>
>
>
>
> -------------------------------------------------------------------------
> The following was automatically added to this message by the list server:
>
> To learn more about Micronet, including how to subscribe to or unsubscribe from its mailing list and how to find out about upcoming meetings, please visit the Micronet Web site:
>
> http://micronet.berkeley.edu
>
> Messages you send to this mailing list are public and world-viewable, and the list's archives can be browsed and searched on the Internet.  This means these messages can be viewed by (among others) your bosses, prospective employers, and people who have known you in the past.
>

--
Jay Bryon
Senior Network Engineer, U.C. Berkeley/IST/IS/Network Operations and Services
[hidden email]
2-5636

"An expert is a man who has made all the mistakes which can be made in a very narrow field."
-Niels Bohr,
   Danish physicist

[Unless stated explicitly otherwise, all opinions are my own and do not represent official policy of any part of IST, U.C. Berkeley or the U.C. Regents]


 
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To learn more about Micronet, including how to subscribe to or unsubscribe from its mailing list and how to find out about upcoming meetings, please visit the Micronet Web site:

http://micronet.berkeley.edu

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Messages you send to this mailing list are public and world-viewable, and the list's archives can be browsed and searched on the Internet.  This means these messages can be viewed by (among others) your bosses, prospective employers, and people who have known you in the past.
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Re: [Micronet] fun with audio

Bruce Satow
Hi Lucy,

Congrats on figuring it out! 
:)
-Bruce



On 1/9/2012 8:28 AM, Lucy Greco wrote:
Hello:
 Thanks to all of you that responded. I was able to get a good sound after about an hour or two more   of fighting with it on Friday. What I needed to do was add a third sound system to the setup. So I added a Logitech USB head set. Now I am getting meeting sound from the Logitech and the system sound for jaws was going in to the  mixer and my mike was plugged in to the mixer. Then I fiddled with the mid and hi ends on the jaws sound and turned the high end down on the mike and at last it was a clean sound. Boy there's a lot more to sound then I knew. The mixer lets me adjust two mids a hi and a low. Then it offers left and write balance and two effect channels . it is way over kill for what I need but it sure helped for trubleshoutting . . thanks every one for all your comments it really helps micronet is one of the best things on campus Lucy 


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


-----Original Message-----
From: [hidden email] [[hidden email]] On Behalf Of Jay Bryon
Sent: Friday, January 06, 2012 4:08 PM
To: [hidden email]
Subject: Re: [Micronet] fun with audio

Since I'm not sure of what your setup looks like, this is a total guess, 
but you may have a configuration problem that is looping your audio from 
the meeting back into your pc, which then goes back out to the meeting, 
resulting in feedback.

Since you're already using an equalizer, you can try to cut the high end 
to see if that helps, but it may be that you need to configure your 
sound to break the feedback loop entirely.

-J

On 1/6/12 8:41 AM, lucia greco wrote:
Hello:
  I have been asked to give several presentations of how a blind person uses
the web. The presentations have both blind and sited partisapents 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 the same wireless mikes that BPAG uses for the mikes . And am
piping it in to a USB mixer. For the  screen reader part 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 scweek in
sound recorder.

I thought I would see if any of you have ideas how to fix this. it is not a
Berkeley project but the seminars could be used by our students in the
future as they will be streamed live for free.
If anyone has an idea about how to fix this I would love to offer dinner if
you could help. thanks Lucy


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




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The following was automatically added to this message by the list server:

To learn more about Micronet, including how to subscribe to or unsubscribe from its mailing list and how to find out about upcoming meetings, please visit the Micronet Web site:

http://micronet.berkeley.edu

Messages you send to this mailing list are public and world-viewable, and the list's archives can be browsed and searched on the Internet.  This means these messages can be viewed by (among others) your bosses, prospective employers, and people who have known you in the past.


    


--
Bruce Satow
University of California at Berkeley
Space Sciences Laboratory
7 Gauss Way
Berkeley, California 94720-7450
[hidden email]
(510) 643-2348

"If the United States of America or Britain is having elections, they don't ask for observers from Africa or from Asia. But when we have elections, they want observers" - Nelson Mandela



 
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The following was automatically added to this message by the list server:

To learn more about Micronet, including how to subscribe to or unsubscribe from its mailing list and how to find out about upcoming meetings, please visit the Micronet Web site:

http://micronet.berkeley.edu

Messages you send to this mailing list are public and world-viewable, and the list's archives can be browsed and searched on the Internet.  This means these messages can be viewed by (among others) your bosses, prospective employers, and people who have known you in the past.