[sdiy] For Your Christmas Color Organ/Envelope Follower

[Phillip Gallo]

Yes, a spectrum analyzer is the more apt description.
Since the idea was an "Envelope Follower" that was responsive to frequency
as well as amplitude, it's a good start.
A frequency responsive Env. Follower could just be the control stack from a
Vocoder configuration summed to single output.

The few channels of the chip is coarse (considered against the audio
spectrum) but a great deal less coarse that the usual single band
Rectifier/Filter approach.
Back in the last century Interstate Electronics produced a multi-band
digital filter chip (ASA16) for speech recognition.   I have a single and
wonder if it will ever be used.

Here's an example of it in a DIY project from the interwebs.

http://www.afox-consulting.com/projects/ASA16.html

p


On Mon, Dec 16, 2019 at 1:00 PM mark verbos <markverbos at gmail.com> wrote:

> Wouldn’t this be more of a “seven band spectrum analyzer" than a "seven
> band graphic equalizer"?
>
> just saying.
>
>
>
> Mark
>
>
>
>
> On Dec 16, 2019, at 7:13 PM, MTG <grant at musictechnologiesgroup.com> wrote:
>
> Did we talk about this guy? It's not terribly new, but I'd never heard of
> it.
>
>
> https://mix-sig.com/index.php/msgeq7-seven-band-graphic-equalizer-display-filter
>
> The interface is kind of funky, but here's the scoop:
>
> *The seven band graphic equalizer IC is a CMOS chip that divides the audio
> spectrum into seven bands. 63Hz, 160Hz, 400Hz, 1kHz, 2.5kHz, 6.25kHz and
> 16kHz. The seven frequencies are peak detected and multiplexed to the
> output to provide a DC representation of the amplitude of each band. No
> external components are needed to select the filter responses. Only an off
> chip resistor and capacitor are needed to select the on chip clock
> oscillator frequency. The filter center frequencies track this frequency.*
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