[sdiy] Cheap audio spectrum analyzer

[Jean-Pierre Desrochers]

Good points.

In fact I noticed that most analyzers available
as standalone have a 'realtime' screen which has refreshed datas all the 
time
and that's not what I'm looking for. I'm looking for some kind of final 
audio spectrum log
drawn on a screeen after the sweep has been done.
And this curve would stand still until the next sweep call.


  Le 2015-10-26 11:02, Richie Burnett a écrit :

> For a frequency analyser with built-in tracking sinewave generator that 
> price is likely towards the bottom end of the price range.
> 
> You can surely hack something together with a Raspberry PI and a decent 
> external audio interface, with the sinewave sweep generator and FFT all 
> done in software, but it depends what's more important to you: your 
> time or your money. It's also not too difficult to make an audio 
> network analyser with a suitably programmed DSP board, but for a piece 
> of test equipment that you can trust it's results, it will take some 
> real development time. That's what you're paying for in an off the 
> shelf commercial solution.
> 
> Have a think about what you actually want to do with the results once 
> you've got the response on your small VGA screen. Most "network 
> analysers" will assume some sort of PC connectivity to download the 
> detailed measurement data for graphing in Excel, publishing in the spec 
> sheet of the product your working on, or whatever. Something that is 
> truly stand-alone might not be as flexible as you think in the 
> long-run.
> 
> You can easily characterise the frequency response of something by 
> playing out a pre-calculated sinewave sweep from your PC, and capturing 
> the output from whatever system you're trying to characterise. Then run 
> an FFT on the captured wave file to get the frequency response. I'm 
> sure there are loads of bits of software that will do this for you, and 
> help with things like calibration, etc. if you could accept going down 
> the PC software route.
> 
> -Richie,
> 
> -----Original Message----- From: Jean-Pierre Desrochers
> Sent: Monday, October 26, 2015 2:43 PM
> To: Richie Burnett
> Cc: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Cheap audio spectrum analyzer
> 
> Hi Ritchie,
> Did you notice the price tag for these things ??
> $1500 and more...
> 
> I was just thinking of a Raspberry PI DIY audio analyzer project
> that could connect on a small VGA screen. Easy to put around my test
> equipments
> taking lots of place so far ....
> I'll do some looking on the web.
> Thanks anyway.
> 
> Le 2015-10-26 10:34, Richie Burnett a écrit :
> 
>> https://www.omicron-lab.com/bode-100/product-description.html [1] [1 
>> [1]] These are relatively cheap and very capable instruments with a 
>> built-in tracking generator. Any particular reason why you don't want 
>> to use a laptop, audio interface and software bundle? This would 
>> probably represent the best tradeoff between cost/performance with 
>> minimal effort required on your part. -Richie, -----Original 
>> Message----- From: Jean-Pierre Desrochers Sent: Monday, October 26, 
>> 2015 1:58 PM To: synth-diy at dropmix.xs4all.nl Subject: [sdiy] Cheap 
>> audio spectrum analyzer Hi list, Do you know of a cheap audio spectrum 
>> analyzer I could buy to check 20-20khz frequency response on audio 
>> stuff ? That would includes sinus generator + analyzer in the same 
>> box. I checked on eBay and most analyzers are RF band based and are so 
>> $$$$$ expensives. But 2 things: - I don't want to use analysis 
>> software on a separate PC - Any DIY projects with micro/graphic LCD 
>> would do.. I want a standalone analyzer. Thanks 
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