Spin Semiconductor

Biquads are known to have very poor low frequency performance when the coefficients are quantized to low bit resolutions. Even 32-bit floating point is not good enough for many audiophiles (noticable distortion can result when trying to obtain a tight notch at 50 Hz). Instead of trying to increase t...

Saw on the home page that this is taping out. So...what is it?

Thanks,

Sean Costello

Hi all: From http://www.spinsemi.com/freeform/INST_SYNTAX.htm#JAM "This can be used in pitch transposition to intelligently reset the read pointer when the input and output of the transpose function are highly correlated." 2 questions: - What sort of correlation measure can be performed on...

Hi all: I was reading an interesting article in a 1985 issue of the Computer Music Journal, by Anthony Agnello and Ed Hage, describing the architecture of the Eventide SP-2016. I didn't make a copy of the article, but from what I remember the "DSP" part of the system had a pretty sparse ar...

A bunch of allpasses in series will simply shift the frequencies... is this true also for "staggered" allpasses, like (in the analog world) so-called "univibed" allpasses? (which in fact is what I called: "half a Dome"; i.e.: 1 branch...) It is hard to say. Allpasses i...

BTW, I do hope to port my Csound Dome filter (phase differencing, or Hilbert network) to the FV-1 once I get the development kit. Keith Barr has the code for a 6th order network in the Informal Notes section. Mine would be 12th order, but it remains to be seen how accurate the network will be, due t...

Most of the above mentioned designs use modulated delay lines in the allpasses, so you can listen to the results. It can be hard to tell whether the modulation is very slow versus random when listening to a reverb, due to the modulation being further diffused by the allpasses that follow the modulat...

Thanks! So, it looks like you could use the ramp LFOs to have 2 triangle LFOs. I will be able to use these.

Sean Costello

Hi:

Is there a simple way of generating triangle wave LFOs for delay modulation in the FV-1?

Thanks,

Sean Costello

Hi:

Is there any way of protecting/encrypting the programs that are placed in the external ROM?

Sean Costello

Hi: I am interested in developing some algorithms for the FV-1 (small scale sales - ranging from personal use to boutique level stompboxes), and will have a series of questions as I contemplate algorithms that would work on the architecture. First question: How would you generate random numbers on t...

FDN = Feedback Delay Network. A feedback delay network is the term usually used to describe a bunch of delay lines in parallel, that are combined via a matrix, and the output of the matrix fed back into the intputs. Miller Puckette and John Stautner have generally been credited with first publishing...

Hi Keith, Thanks for the reply! I am mostly interested in the history of such algorithms. I have developed a lot of different reverb algorithms, but as far as I know, none of them have made it into a product (I work for a DSP manufacturer, that does not have a primary focus on MI audio). Interesting...

Hi: I have been studying and implementing digital reverbs since the late 1990's. Most of the articles on digital reverbs have tended to discuss either Schroeder structures, or feedback delay networks (Puckette, Jot). Yet it seems like a large number of commercial reverbs are based around having seve...