Spin Semiconductor

Lazy man's answer: Do you really need 3x oversampling? Most of the oversampling SVFs I have seen are for floating point applications, where setting the cutoff above fs/6 results in an almost instant "blowup." Fixed point SVFs don't blow up in the same way as the floating point ones - they ...

Here is my current nested allpass code. Note that it takes 10 instructions for a single allpass nested inside of an outer allpass. Any slight improvement would be helpful. ; outer allpass rda delay+lap3start, kap ; read from the delay buffer at the start of the allpass delay, and scale by kap rda de...

Hi all: I am wondering what the best method is for programming nested allpass filters / lattice allpass filters on the FV-1. I have been working on this, but my current technique is very inefficient (and is on a different computer, so no snippets to post at this time). I am interested in both regist...

Hi: I would like to run the 2 ramp LFOs with a 90 degree phase relationship, but am having problems getting this to work. Two possibilities that I can think of: - Use SKP and JAM to reset the second ramp LFO when the first LFO's value is greater than a preset threshold. This seems like it would work...

Email w/code sent...

How is JAM used? I tried putting the following in some pitch shifter code:

JAM rmp0

If inserted into the main code loop, it seems like this should simply halt any pitch shifting, but it seems to have no effect. Is there some other way of identifying the ramp to be reset?

Thanks,

Sean Costello

Any word yet?

Thanks,

Sean Costello

Thanks for the help. Figured out that delay based allpasses work well enough for my applications.

Sean Costello

Thanks! I tried porting my 12th order phase differencing network over, and it sounds OK, but I am guessing that the coefficient quantization is causing problems. I would like to convert the allpasses to using registers as the sample delay, but my attempts have resulted in horrible noise. What is an ...

Hi: I was looking for the frequency shifter code that used to be linked from the Knowledge Base page, at http://www.spinsemi.com/knowledge_base/pitch_sft.html The link currently produces a 404 error. Quick question: Does the phase differencing network used in the example use delay memory for the all...

Post-NAMM announcement, maybe?

Can the assembler be altered to allow amplitude coefficients less than -16384 for the ramp LFOs? This would be a neat feature.

Sean Costello

Hi: Just started working a bit more seriously with the SpinASM IDE tool, and ran into something annoying: When I am loading a project, it will open a new document window for each file in the project. I tend to do a lot of quick iterations, which means that I get over 10 versions of the file I am wor...

Could you do something along the lines of y[n] = (a*y[n-1] + c) modulo m and implement a linear congruential generator? If so, how do you enter the values of a and c? Is there a way for the compiler to deal with 16 bit ints, or do you have to convert these to the floating point number that correspon...

Any news on this front?