[Lab] Audio Spectrum display

Aurelius R maxrowsell at gmail.com
Mon Feb 10 09:28:31 EST 2014

The keyword is 'attenuation' or 'attenuator'. That's what you'd need, a
switchable attenuator to reduce volume when the signal gets too 'hot'

Peace, Love, Empathy

Alexander Max Rowsell

On 10 February 2014 09:27, Aurelius R <maxrowsell at gmail.com> wrote:

> 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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