Forums

Automatic Gain Control

Started by shiv8groups March 4, 2002
Hi friends,

Can anybody tell me how to implement
-Automatic Gain Control
-Pre-emphasis

Any help will be highly appreciated.
Best Regards,
Shiv




Hi
A simple Pre-emphasis filter as implemented in GSM 06.10 is as follows:
y(n) = x(n) - 0.8599 * x(n-1)
regards,
satheesh.s -----Original Message-----
From: shiv8groups [mailto:]
Sent: Monday, March 04, 2002 9:19 PM
To:
Subject: [echocancel] Automatic Gain Control Hi friends,

Can anybody tell me how to implement
-Automatic Gain Control
-Pre-emphasis

Any help will be highly appreciated.
Best Regards,
Shiv

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AGC implementation varies application to application. Can you elaberate
for what application you want to implement and what is input.
AGC generally have a algo for average power detection and a loop filter.
Pre-emphasis is a filter which boost up the higher frequencies. You can
refer any FIR filter implementation. ----- Original Message -----
From: "shiv8groups" <>
To: <>
Sent: Monday, March 04, 2002 9:18 PM
Subject: [echocancel] Automatic Gain Control > Hi friends,
>
> Can anybody tell me how to implement
> -Automatic Gain Control
> -Pre-emphasis
>
> Any help will be highly appreciated.
> Best Regards,
> Shiv >
>
> _____________________________________
> Note: If you do a simple "reply" with your email client, only the author
of this message will receive your answer. You need to do a "reply all" if
you want your answer to be distributed to the entire group.
>
> _____________________________________
> About this discussion group:
>
> To Join:
>
> To Post:
>
> To Leave:
>
> Archives: http://www.yahoogroups.com/group/echocancel
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Hi satish, and Singh,

Thanks for your responses.
I want to implement AGC for a hands-free speakerphone, where Echo
Cancellation and, Noise Cancellation/suppression algorithms will be
implemented. Now I wanted to implement an AGC there, so that, speech signal,
can be brought in the range of proper hearing level.

Is there any algo available specifically for this kind of application.

Any help will be highly appreciated.
Best Regards,
Shiv
-----Original Message-----
From: S Singh [mailto:]
Sent: Wednesday, March 06, 2002 9:38 AM
To:
Subject: Re: [echocancel] Automatic Gain Control AGC implementation varies application to application. Can you elaberate
for what application you want to implement and what is input.
AGC generally have a algo for average power detection and a loop filter.
Pre-emphasis is a filter which boost up the higher frequencies. You can
refer any FIR filter implementation. ----- Original Message -----
From: "shiv8groups" <>
To: <>
Sent: Monday, March 04, 2002 9:18 PM
Subject: [echocancel] Automatic Gain Control > Hi friends,
>
> Can anybody tell me how to implement
> -Automatic Gain Control
> -Pre-emphasis
>
> Any help will be highly appreciated.
> Best Regards,
> Shiv >
>
> _____________________________________
> Note: If you do a simple "reply" with your email client, only the author
of this message will receive your answer. You need to do a "reply all" if
you want your answer to be distributed to the entire group.
>
> _____________________________________
> About this discussion group:
>
> To Join:
>
> To Post:
>
> To Leave:
>
> Archives: http://www.yahoogroups.com/group/echocancel
>
> Other DSP-Related Groups: http://www.dsprelated.com > ">http://docs.yahoo.com/info/terms/ >
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want your answer to be distributed to the entire group.

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