Jump to content

Hades

Member
  • Content Count

    19
  • Joined

  • Last visited

Community Reputation

17

About Hades

  • Rank
    Contributor
  1. Someone posted another one CC can be translated to English.
  2. Iffy Signals Nov 29, 2019 - Minelab Vanquish 540 Depth & Recovery Test with 8" Coil
  3. There should be a slot for 8" floppy somewhere. Or punch cards 🙂
  4. 8051 was my first true love 🙂 It had the whole 128 bytes of RAM
  5. Look, you completely missed what i was saying before. I worked a bit with ultrasound like signals, and all that signal processing stuff is quite similar to what is used in cases like Xterra and Equinox. Same dds-demod-multirate filter etc. So in our case one channel (I or Q) with DDS, demodulator and post demod mutltirate filter was consuming around 50 operations per sample with 32 bit integers. Actually some accumulators were wider than 32 bits, but not that important. Assuming that equinox processing is similar, works with four frequencies, has sampling frequency of 100kHz for simplicity, we are getting 80 millions of these calculations per second. It is already a significant portion of what M7 core can do at 200MHz. You keeps assuming that all it does is scans buttons and lights up segments on display, which is completely wrong.
  6. RTOS and rendering on a fly are not the same thing again.
  7. Things are a little bit different when you need to do it in a real time. And for some reason you switched from amount of calculation to a file size. It's not the same thing.
  8. Lots of other detectors process signals differently. Equinox, and I'm guessing Vanquish, is similar to Xterra. It performs quadrature demodulation and post demod filtering in a digital form. Xterra demodulates and postfilters only one pair of I and Q for receiver and one pair for transmitter, where equinox has to do at least as much for each frequency it processas. On top of that Xterra has a samplig frequency somewhere above 40kHz, where equinox needs to have it at least twice higher (remember highest frequency of 40kHz), which immideatly at least doubles amount of calculations done in processing for each frequency.
  9. It's not exactly clear if Vanquish uses the same CPU or not, but if it does, than I strongly disagree with this statement. No one would use a highly redundant part in a low-ish cost, high volume product.
  10. St32F745 https://www.google.com/search?q=stm32f745&ie=utf-8&oe=utf-8&client=firefox-b-m
×
×
  • Create New...