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  • duff's Avatar
    03-12-2019, 03:16 AM
    Also in the bigger picture this library uses double buffering so when one buffer is filling up the other is being worked on, this helps with latency. This algorithm has a high cpu load so I had to split up the...
    3 replies | 95 view(s)
  • duff's Avatar
    03-12-2019, 03:03 AM
    Yes, it was done for performance issues. You also should lowpass filter the data stream before feeding it to notefreq. If you look at my GitHub version I do that for you when decimating the audio buffer using the CMSIS...
    3 replies | 95 view(s)
  • duff's Avatar
    03-11-2019, 08:16 PM
    Where is the 3.3V regulator located on the board?
    2034 replies | 297437 view(s)
  • duff's Avatar
    03-05-2019, 04:39 PM
    I've been working on a phase vocoder off and on for awhile now and I can tell you its not easy, well not easy for realtime pitch shifting using Audio library. First off the q15 data type for CMSIS FFT's will lose to...
    14 replies | 2369 view(s)
  • duff's Avatar
    02-21-2019, 09:11 PM
    Ok so DMAMEM is OCRAM which is 256k makes sense now. I saw this comment on this thread just now that explains that Paul is using fixed memory sections in the linker script and will fix later. Ok I'm moving on to other...
    2034 replies | 297437 view(s)
  • duff's Avatar
    02-21-2019, 08:33 PM
    With beta9 I get the cryptic memory error (section `.bss' is not within region `DTCM') with this sketch: #define BUF_SIZE 30066 uint32_t buffer; void setup() { memset(buffer, 0, BUF_SIZE * sizeof(uint32_t));...
    2034 replies | 297437 view(s)
  • duff's Avatar
    02-20-2019, 10:57 PM
    Thanks I did not see this before it definitely helps. I know what was wrong with my optimized fft issue, had to change define about using Kinetis K chips. Even with dsp v1.5.1 it still beats the stock 1024pt fft...
    2034 replies | 297437 view(s)
  • duff's Avatar
    02-20-2019, 03:29 PM
    Just got my T4 and expansion board yesterday, just been poking around for now. Going to work on the low power stuff soon but it looks like I will have to mess with the cpu speeds, voltages and multiple PLLS + Doze bits...
    2034 replies | 297437 view(s)
  • duff's Avatar
    02-10-2019, 07:42 PM
    Using deepSleep or hibernate will put the boot-loader chip into a low power state that only wakes with the program button push to get it into boot loader mode again. You don't have to use Snooze and roll your own lower...
    3 replies | 101 view(s)
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About duff

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About duff
Location:
Las Vegas
Interests:
Bass Guitar, WSN, Reading, Traveling
Occupation:
Reasearch Tech

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Question regarding notefreq code 03-12-2019 03:16 AM
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03-12-2019 03:16 AM
Join Date
01-31-2013