Choosing a DSP for Audio Spectrum Display

[HamiltonHipster]

Hello eevForum,
  I'm trying my hand at designing a 10 band Audio Spectrum, using DSP.
I have already designed the 11 x 10 display logic for an ATF2500c i have lying around, and i want to communicate to it using SPI.

  Does anybody know of any (relatively cheap) audio DSP i can use to sample, process, and send out using SPI?
DIP or surface mount, i don't mind.

Cheers

[HamiltonHipster]

  Wow fast response!

These chips look good, Thanks Pippy.

I will need to do a lot of datasheet reading to figure out which one will be adequate... I really just want a light show on the front of an amp

Thanks a bunch

[HamiltonHipster]

I have book marked the chips you've found for me, they quite powerful.

I did have ideas of making 80 or 160 band displays, but a simpler 10 band one will get me in the game. I'm taking classes for DSP at the moment, and i'm working on this as a side project. An AVR looks like the way to go for a simple project like this.

Thanks for being patient

FFT = Fast Fourier Transform?

[dannyf]

An AVR looks like the way to go for a simple project like this.

That would be SFT: slow fourier transformation,

Seriously, it has been done with 8051s - but that chip has a significant math advantage over most 8-bit mcus.

[ve7xen]

Seriously, it has been done with 8051s - but that chip has a significant math advantage over most 8-bit mcus.

http://elm-chan.org/works/akilcd/report_e.html

[elektronchika]

Texas Instruments Tiva C Launchpad - $13 with free worldwide shipping

[tehmeme]

This may be a little overkill for your needs, but have a look at this thread:
https://www.eevblog.com/forum/projects/3d-pov-display-full-design/msg246708/#msg246708

and his youtube channel is:
https://www.youtube.com/user/jfghvljgvktgvlkhvgyv/videos

This is his second thread showing a time lapse of his PCB construction for this project:
https://www.eevblog.com/forum/projects/pcb-construction-time-lapse/msg275174/#msg275174

[maros]

If you want to start doing projects related with DSP, I'd reccomend C2000 Piccolo LaunchPad. It's cheap and have it's own integrated isolated XDS100 JTAG emulator on board. You could download complete IDE for it (Code Composer Studio) and lot of example projects.

[HamiltonHipster]

Good stuff!

Thanks a lot guys!

When i've finished i'll post a thread on how it went 

[tszaboo]

What is usually forgotten, that audio Spectrum is displayed in LOG scale. so if you want to display 20Hz and 16000 Hz, than you need to make a 8000 point FFT at least, and throw away (ok, not exactly) most of the points. But huge computing power is required. That AVR display is completely linear, in both ways. It is still impressive, but completely useless.

[nctnico]

Goertzel is the magic word here.

[kripton2035]

Microchip 16-bit Embedded Control Design Contest, entry MT1750
with a dsPIC30F6012A

http://www.circuitlib.com/index.php/library/product/9-audio-spectrum-analyzer/category_pathway-24