Search found 74 matches

by seancostello
Tue Aug 08, 2017 3:45 pm
Forum: Algorithm development
Topic: Changing Hall Reverb size
Replies: 4
Views: 10153

OK, just took a closer look at the code, and it looks like the tapped early reflections delay line has the output tap code commented out. So, all of the ld1, rd1, etc. values don't actually do anything in this code. The early reflection delay line has several points that are read, diffused with an a...
by seancostello
Tue Aug 08, 2017 1:44 pm
Forum: Algorithm development
Topic: Changing Hall Reverb size
Replies: 4
Views: 10153

The "size" of a reverb is typically determined from the early reflections, so if you push those things further out you are likely to get a subjective impression of increased size. This would be my suggestion as well. I would scale up all the mem values associated with the input (idel, iap...
by seancostello
Tue Jul 18, 2017 11:22 am
Forum: FV-1 hardware questions
Topic: NAMM 2017
Replies: 41
Views: 64503

Will the FXCore run at sampling rates other than 48 kHz?
by seancostello
Tue Jul 18, 2017 10:15 am
Forum: FV-1 hardware questions
Topic: Using a microcontroller to clock the FV-1?
Replies: 3
Views: 7243

Re: Using a microcontroller to clock the FV-1?

If you feel like checking it out I have a ZDSP card (or several) in progress. https://www.instagram.com/p/BNf9BNIAS4j/ Not sure why it took me 6 months to see this, but it sounds INCREDIBLE! That is some amazing time stretching/scrubbing going on there. Very Gantz Graf. also assumably have a Z-DSP,...
by seancostello
Thu Jul 06, 2017 2:01 pm
Forum: FV-1 hardware questions
Topic: NAMM 2017
Replies: 41
Views: 64503

Any more news on the new DSP?
by seancostello
Wed Aug 17, 2016 10:51 am
Forum: FV-1 hardware questions
Topic: Using a microcontroller to clock the FV-1?
Replies: 3
Views: 7243

Using a microcontroller to clock the FV-1?

Hi all,

Has anyone used a microcontroller to send a clock signal to the FV-1? Is this doable with something like an ATMega328?

Thanks,

Sean Costello
by seancostello
Wed Aug 17, 2016 10:35 am
Forum: FV-1 hardware questions
Topic: more than 8 programs?
Replies: 13
Views: 28018

Just saw that the ATMega328 is available in SMD: http://www.mouser.com/ProductDetail/Atmel/ATMEGA328P-AU/?qs=K8BHR703ZXiCmmgp6%2FGNmQ%3D%3D Question: If the FV-1 ROMs were part of a program that was flashed to the ATMega328, and I2C was used to write the programs directly to the FV-1 (i.e. no interm...
by seancostello
Thu Aug 11, 2016 10:43 pm
Forum: Algorithm development
Topic: Frank's delay time pot smoothing technique
Replies: 9
Views: 13647

Do you guys experiment a high pitch whining with the ramping using this code?, I can't get rid of that!. The whining noise is due to the lack of interpolation when changing the delay length. The delay length change is being smoothed out, but it is still quantized to integer sample delays. Sean Cost...
by seancostello
Thu Mar 31, 2016 10:17 am
Forum: Algorithm development
Topic: HIgher-order filters?
Replies: 3
Views: 5920

Re: HIgher-order filters?

I was looking at some analog SVF designs today and saw a couple where there are a few more integrators inside the loop, for example to make it a 4th order filter. Up to now if I wanted a 4th order filter (which is not very often, for guitar) I just cascade 2 2nd order blocks. But if you want LP and...
by seancostello
Thu Oct 02, 2014 10:25 am
Forum: FV-1 hardware questions
Topic: Question on noise.
Replies: 8
Views: 10614

Thanks for the info Frank, I dodn't have a quality scope at my disposal anymore to use but have managed to get the result in the end. The power lines are clean and no noise on the inputs to the FV-1, so I tried a program with just a freq generator to output to the DAC's which still produced the whi...
by seancostello
Tue Jun 17, 2014 10:18 am
Forum: FV-1 hardware questions
Topic: Delay RAM floating point format?
Replies: 1
Views: 4996

Delay RAM floating point format?

I read in the manual that the FV-1 delay RAM is 32k by 14 bits. What is the floating point breakdown for the delay RAM? In other words, how is the 14-bit word divided between mantissa, exponent, and sign?

Thanks,

Sean Costello
by seancostello
Wed Jun 04, 2014 1:38 am
Forum: Algorithm development
Topic: Noise Generation?
Replies: 3
Views: 6971

The code listed above works very well! Earlier this week, I had implemented randomness using the "grab the lowest bits of the ADC" method. This generates noise, but the noise is not random, in that it is correlated to the input signal running through the ADC. In addition, you need to use a...
by seancostello
Sun May 11, 2014 6:17 pm
Forum: FV-1 hardware questions
Topic: FCC Compliance tips?
Replies: 3
Views: 6921

Thanks, Frank!

Sean Costello
by seancostello
Sun May 11, 2014 12:40 pm
Forum: FV-1 hardware questions
Topic: FCC Compliance tips?
Replies: 3
Views: 6921

FCC Compliance tips?

I just came across this article: http://www.effectsbay.com/2014/05/fcc-regulations-for-pedals/ $450K is a pretty significant penalty. Any tips for designing circuits with the FV-1 that would be compliant with the FCC regulations? Obviously, the circuit itself would have to be tested - just wondering...
by seancostello
Thu Sep 12, 2013 1:23 pm
Forum: FV-1 software questions
Topic: Quantizing pitch control to semitones?
Replies: 7
Views: 10486

As a DSP of friend of mine once told a more senior DSP fellow that was trying to explain a difficult concept, "I don't want you to teach me how to fish. I just want a fish." :D I'll do some Excel work tonight, and see if I can get the math to work. I may hit you up with some EXP/LOG questi...