PIC doing sound equalising?

curt2go · Joined: 21 Nov 2003 Posts: 200

I am using a 16bit dac into an amplifier. My processor is a 24EP256GP206 running at 140MHz. I am wondering if anyone has ever done any equaliser type stuff with a pic. Is it even possible to boost some frequencies and lower others or is it all just happening way to fast. I am using an interrupt to run the sound file from an SD card.

Let me know if you have any thoughts.

temtronic · Posted: Sat Nov 12, 2016 6:14 am

While it _might_ be possible, it 'd take a lot of code, so I hope you have LOTS of 'free' time.....
What I had a PIC do was control a SB IDE (8 bit) sound card Mind you this was 2 decades ago when the 16F877 was 'the' pick of PICs, board was wirewrapped and it did work, rather well. All the hard 'analog control' was done in the SB card, PIC just diddled it's registers.....,
The key to coding, is to focus on one feature, get it working, then recode to make as small and fast a function as possible, building your 'library' of features as you go. Not too sure how you tackle the 'tone' control, bass boost, equailzer features but start with say just 'bass bost', learn and proceed.
I can see a LOT of reading, Googling and code cutting for sure !!

Jay

Ttelmah · Joined: 11 Mar 2010 Posts: 19338

I'd have to suggest that it'd be far easier to use a simpler/slower PIC, and do the equaliser function externally using something like an LMC835. To actually do simultaneous processing on multiple bands, is going to be a lot of code (allow several months of development....).

curt2go · Joined: 21 Nov 2003 Posts: 200

LOL. That's what I thought. Next revision I will just use a DAC that has it built in. Far easier to write a register. Funny thing is I found one same specs as what i'm using essentially but with the added mixing functions.. Crazy.

Thanx for your input guys as always.