[Lab] Audio Spectrum display

Aurelius R maxrowsell at gmail.com
Mon Feb 10 09:27:50 EST 2014

Just look into ICs that do audio processing. Or even analog audio
filtering, that reduces the intensity of the audio source before hitting
the meter.

One possible method is the venerable LM3914 dot/bar display driver. You can
connect them in series, and/or in parallel to monitor different
frequencies. They actually make a special version of the LM3914 that has a
log ramp instead of linear, for audio uses. Then all you have to work out
is your analog/digital front-end

Peace, Love, Empathy

Alexander Max Rowsell

On 10 February 2014 08:13, Justin Slootsky <justin at slootsky.org> wrote:

> Do you have any pointers or suggestions on how I would go about doing this
> filtering?  I'm not even sure what keywords to use to start researching it.
> ------------------------------
> *From: *"Ryan Prior" <ryanprior at gmail.com>
> *To: *"Justin Slootsky" <justin at slootsky.org>
> *Sent: *Sunday, February 9, 2014 11:11:49 PM
> *Subject: *Re: [Lab] Audio Spectrum display
> On Sun, Feb 9, 2014 at 9:46 PM, Justin Slootsky <justin at slootsky.org>wrote:
>> I've been thinking about doing something like this, but a completely
>> different display method (individually addressable pixels in a line,
>>  colour to denote frequency,  or if that just works out to too close to all
>> white, then pixels for a frequency, and vary the intensity...  Or something)
> Yeah, you won't need to worry about them ending up all white because you
> can filter and stratify the source signal before sending it to display.
> The bit that I'm wondering / worried about is that I'm planning on using
>> this in a very loud venue,  what microphone choices do I need to make in
>> order for it not to be all blown out and reading 11 the whole time?
> A fancy microphone is not important. You will get your best results by
> carefully choosing how you filter the audio. If there's lots of distortion,
> crash symbol, etc in the venue then you will need to treat that carefully
> to keep it from maxing out your signal. Play around with it and let us know
> if you need help.
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