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dale116dot7 · 10th April 2009

Yes, I did the layout and hand-built two of them. I'm planning on migrating from the AL3201 processor to that 'real' DSP - the DSP56366. I gave it 512k of SRAM, but I mapped it in two chunks with a hole in the middle so the number of address lines on the outside of the chip cause the memory to wrap around so you can use a simple delay line without using the modulus operator, which in the DSP56300 family, is limited to 32k.

Ok, I'll try that probably tomorrow morning. This is getting interesting. The three separate loops are really neat. I am amazed at how the three loop simple 'slapback' delay actually begins to sound like a reverb and not just a simple Sun Records style of delay. I know the original allpass loop arrangement didn't do this, I've not actually seen this sort of arrangement except in the context of an FDN.

Another thing that is popping out at me is to cross-couple the loops a bit to simulate corner modes.

I've also got a pretty big inventory of other DSP's - at least for a hobbyist. I have a few Spartan-3E FPGA's, a tray (60) of the older DSP56002's, and about 20 of the AL3201's in a rail.

10th April 2009	#23
dale116dot7 Lives for gear Joined: Dec 2003 Location: Calgary, Alberta Posts: 816 Thread Starter	Yes, I did the layout and hand-built two of them. I'm planning on migrating from the AL3201 processor to that 'real' DSP - the DSP56366. I gave it 512k of SRAM, but I mapped it in two chunks with a hole in the middle so the number of address lines on the outside of the chip cause the memory to wrap around so you can use a simple delay line without using the modulus operator, which in the DSP56300 family, is limited to 32k. Ok, I'll try that probably tomorrow morning. This is getting interesting. The three separate loops are really neat. I am amazed at how the three loop simple 'slapback' delay actually begins to sound like a reverb and not just a simple Sun Records style of delay. I know the original allpass loop arrangement didn't do this, I've not actually seen this sort of arrangement except in the context of an FDN. Another thing that is popping out at me is to cross-couple the loops a bit to simulate corner modes. I've also got a pretty big inventory of other DSP's - at least for a hobbyist. I have a few Spartan-3E FPGA's, a tray (60) of the older DSP56002's, and about 20 of the AL3201's in a rail.