More on frequency interpretation

Archiver

I had asked earlier about a way to get different frequency spectra in an
audio source to 'trigger' different I/O lines if they were excited. I got
some leads, but I now have a more specific question.

There seem to be a number of graphic EQ I/C's with TTL controls, but I
have not as yet found and IC which will allow you to read the per-band
excitation, just change it. . Is there some way of doing this with a
simple IC?


Sean T. Lamont, CTO / Chief NetNerd, Abstract Software, Inc. (ServNet)
Seattle - Bellingham - Vancouver - Portland - Everett - Tacoma - Bremerton
email: lamont@a... WWW: http://www.serv.net
"...There's no moral, it's just a lot of stuff that happens". - H. Simpson

Archiver

At 10/27/2000 -0700 12:00 AM, you wrote:

>I had asked earlier about a way to get different frequency spectra in an
>audio source to 'trigger' different I/O lines if they were excited. I got
>some leads, but I now have a more specific question.
>
>There seem to be a number of graphic EQ I/C's with TTL controls, but I
>have not as yet found and IC which will allow you to read the per-band
>excitation, just change it. . Is there some way of doing this with a
>simple IC?

Sean -

Take a look at the Philips TEA6360 which is an I2C 5-band equalizer.and the
TEA6320 which is an I2C sound fader control circuit. I'm no audiophile, but
this may do what you need. I base this only on the ability to invoke noise
reduction circuits, and the dual control blocks, both of which imply (to
me) changes on-the-fly. Check the Volume II Control Block of the '6320 for
details. The Volume I Control Block seems to be just gross loudness.

I may be mistaken, but couldn't one mute the output, make changes to the
fader (as required) and use the equalizer like a feedback source ? The
output of the equalizer being the basis for future changes to the fader,
until some desired level or condition is met - then turn off mute - etc,
etc, etc.

My apologies if I misunderstood your requirement.

Regards,

Bruce Bates


>Sean T. Lamont, CTO / Chief NetNerd, Abstract Software, Inc. (ServNet)
>Seattle - Bellingham - Vancouver - Portland - Everett - Tacoma - Bremerton
>email: lamont@a... WWW: http://www.serv.net
>"...There's no moral, it's just a lot of stuff that happens". - H. Simpson

Archiver

If you know the fine points of using fft algorithms, microchip has PIC code
on its website.
Dennis

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Original Message

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From: Sean T. Lamont .lost. <lamont@a...>
To: INTERNET:basicstamps@egroups.com <basicstamps@egroups.com>
Date: Friday, October 27, 2000 12:01 AM
Subject: [noparse][[/noparse]basicstamps] More on frequency interpretation


>
>I had asked earlier about a way to get different frequency spectra in an
>audio source to 'trigger' different I/O lines if they were excited. I got
>some leads, but I now have a more specific question.
>
>There seem to be a number of graphic EQ I/C's with TTL controls, but I
>have not as yet found and IC which will allow you to read the per-band
>excitation, just change it. . Is there some way of doing this with a
>simple IC?
>
>
>Sean T. Lamont, CTO / Chief NetNerd, Abstract Software, Inc. (ServNet)
>Seattle - Bellingham - Vancouver - Portland - Everett - Tacoma - Bremerton
>email: lamont@a... WWW: http://www.serv.net
>"...There's no moral, it's just a lot of stuff that happens". - H. Simpson
>
>
>
>