Search found 1244 matches
- Mon Oct 11, 2021 7:24 am
- Forum: FV-1 hardware questions
- Topic: Ground separation
- Replies: 3
- Views: 7869
Re: Ground separation
Ground is tied together in the chip so it doesn't matter. What is important is to have a good, solid ground plane.
- Wed Oct 06, 2021 7:35 am
- Forum: Algorithm development
- Topic: DDS frequency formula and sin generating
- Replies: 19
- Views: 22241
Re: DDS frequency formula and sin generating
Similar but not the same. You will have to review the languages to see how difficult it will be for your programs.
- Tue Oct 05, 2021 11:31 am
- Forum: Algorithm development
- Topic: DDS frequency formula and sin generating
- Replies: 19
- Views: 22241
Re: DDS frequency formula and sin generating
Let me ask you one more question, unrelated to the topic. Is there any way to prevent the eeprom contents from being decompiled? You know, I'm afraid now I can buy any FV-1 based product, make the memory dump and decompile bin with shift-line's docompiler. Is there any way to "crypt" it? ...
- Tue Oct 05, 2021 7:43 am
- Forum: Algorithm development
- Topic: DDS frequency formula and sin generating
- Replies: 19
- Views: 22241
Re: DDS frequency formula and sin generating
Just set COS and SIN to the proper starting points. As long as COS leads SIN by 90 degrees it should work. So any of the following should work (values in degrees not actual SIN and COS values):
S=0, C=90
S=0, C=-90
S=C=45
S=0, C=90
S=0, C=-90
S=C=45
- Mon Oct 04, 2021 11:10 am
- Forum: Algorithm development
- Topic: DDS frequency formula and sin generating
- Replies: 19
- Views: 22241
Re: DDS frequency formula and sin generating
Probably a bit width issue, MULX is a 16-bit coefficient so losing the lower 8-bits of the value used for the coefficient.
- Mon Oct 04, 2021 9:01 am
- Forum: Algorithm development
- Topic: DDS frequency formula and sin generating
- Replies: 19
- Views: 22241
Re: DDS frequency formula and sin generating
That was a reply intended for another person who is using the h/w LFOs. To answer you, don't use SOF. SOF only takes a S1.14 format 16-bit value and you are trying to put in too small a number. So your choices are to use a larger value and shift the result down like you are with the SOF 0.1, 0 instr...
- Sun Oct 03, 2021 1:07 pm
- Forum: Algorithm development
- Topic: DDS frequency formula and sin generating
- Replies: 19
- Views: 22241
Re: DDS frequency formula and sin generating
You will have to do the LFO in code, there are examples in the forum.
- Sun Oct 03, 2021 10:50 am
- Forum: Algorithm development
- Topic: DDS frequency formula and sin generating
- Replies: 19
- Views: 22241
- Sun Oct 03, 2021 10:31 am
- Forum: FV-1 software questions
- Topic: Problem with controlling LFO
- Replies: 5
- Views: 8004
Re: Problem with controlling LFO
Then you will probably need to code it by hand to get the desired range and resolution and not use the built in LFOs.
- Sun Oct 03, 2021 10:10 am
- Forum: Algorithm development
- Topic: DDS frequency formula and sin generating
- Replies: 19
- Views: 22241
Re: DDS frequency formula and sin generating
SOF takes a 16-bit C value, 0.00028095 is 1,000 times smaller (about 11 bits) than 0.28095 so you lose 11-bits of resolution.
Just look at the assembled code:
0000 0004000D :sof 0.00028095, 0
0001 11FB000D :sof 0.28095, 0
Just look at the assembled code:
0000 0004000D :sof 0.00028095, 0
0001 11FB000D :sof 0.28095, 0
- Sun Oct 03, 2021 9:58 am
- Forum: FV-1 software questions
- Topic: Problem with controlling LFO
- Replies: 5
- Views: 8004
Re: Problem with controlling LFO
It is a limited range LFO designed for things like chorus, etc. If you want a really wide ranging sin generator with lots of resolution you will have to code it up by hand and maybe use 2 POTs for a coarse and fine adjustment. In most effects the absolute frequency is unimportant, it is what sounds ...
- Sun Oct 03, 2021 9:47 am
- Forum: Algorithm development
- Topic: DDS frequency formula and sin generating
- Replies: 19
- Views: 22241
Re: DDS frequency formula and sin generating
Maybe different sample rates?
- Sat Oct 02, 2021 2:15 pm
- Forum: Algorithm development
- Topic: DDS frequency formula and sin generating
- Replies: 19
- Views: 22241
Re: DDS frequency formula and sin generating
See this thread, the code in it show how the SIN algo works: http://www.spinsemi.com/forum/viewtopic.php?t=28
- Sat Oct 02, 2021 2:10 pm
- Forum: FV-1 software questions
- Topic: Problem with controlling LFO
- Replies: 5
- Views: 8004
Re: Problem with controlling LFO
Have you looked at the equations and mapping of bits for sinX_rate in AN-0001?
- Mon Sep 20, 2021 4:16 pm
- Forum: FV-1 software questions
- Topic: Pseudo-stereo alghritm?
- Replies: 13
- Views: 29625
Re: Pseudo-stereo alghritm?
Couple of different ways google it to show you some of them. Basically delays and filtering.