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  • Bob Larkin's Avatar
    Yesterday, 10:24 PM
    Hi Frank - It appears that there is a small difference. With LineInLevel set to 10, it is the same as before, but with LineInLevel set to 0, the spectrum is now about the same as it was for LineInLevel 10. So, it...
    10 replies | 138 view(s)
  • Bob Larkin's Avatar
    Yesterday, 06:56 PM
    Hi Richard - Thanks for the thoughts. I will explore your idea of probing for spectral stuff associated with the hardware. One way is to use a general purpose spectrum analyzer running in the PC like Spectrum...
    10 replies | 138 view(s)
  • Bob Larkin's Avatar
    Yesterday, 03:37 AM
    @palmerr, It is interesting to see the other data and thanks for posting that. On most of the plots I have shown, there is no input. The signal like spikes are coming from the CODEC board and possibly the T3.6 it is...
    10 replies | 138 view(s)
  • Bob Larkin's Avatar
    03-28-2020, 06:02 PM
    Hello to both Franks!! Good to be in touch again. The DD4WH receiver seems to do somewhat what Frank B is suggesting? I have worked my way through that code and I think Frank DD4WH would agree that there is a...
    33 replies | 7446 view(s)
  • Bob Larkin's Avatar
    03-27-2020, 11:05 PM
    I am exploring the rewrite of an old project, the DSP-10 radio. I have had good experience with the T3.6 floating point radio receiver that Frank DD4WH put together. But, I would also like to build...
    33 replies | 7446 view(s)
  • Bob Larkin's Avatar
    03-25-2020, 12:16 AM
    I was unaware of your CS42488 project, and it looks like fun stuff. You show a couple of spectrum plots on 2-25-2020. The one of noise only is interesting. How many points in the FFT (because, that varies the noise...
    10 replies | 138 view(s)
  • Bob Larkin's Avatar
    03-24-2020, 05:30 PM
    By accident, I discovered that the presence of the square wave in the SGTL5000 depends on the analog audio gain inside the CODEC, as set by lineInLevel(x). Here are two cases for x=10(top) and x=0 (bottom). The...
    10 replies | 138 view(s)
  • Bob Larkin's Avatar
    03-23-2020, 11:45 PM
    Bob Larkin replied to a thread Audio GUI for T4 in Audio Projects
    I notice that "Import" does not bring in the Patch Cords, and not always the objects. This is true for both of the external GUI's. "Export" seems fine.
    7 replies | 261 view(s)
  • Bob Larkin's Avatar
    03-23-2020, 10:35 PM
    Bob Larkin replied to a thread Audio GUI for T4 in Audio Projects
    Having played with this, it seems like a neat thing would be to have only one GUI, with check boxes for including specific libraries, like Chip's floating point, and radio buttons for the processor, T3, T4, etc. The...
    7 replies | 261 view(s)
  • Bob Larkin's Avatar
    03-21-2020, 07:16 PM
    I posted hardware information on a basic WM8731 CODEC board, last summer https://forum.pjrc.com/threads/56331-WM8731-Board-Ideashttps://forum.pjrc.com/threads/41356-Audio-Adapter-ADC-Square-wave-with-no-input. Then we...
    10 replies | 138 view(s)
  • Bob Larkin's Avatar
    02-17-2020, 05:23 PM
    I'm working with a fellow who wrote a VNA control program, the goal being to get compatibility with my AVNA https://forum.pjrc.com/threads/41326-Update-Audio-Vector-Network-Analyzer?highlight=AVNAhttp:// He uses the...
    0 replies | 92 view(s)
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About Bob Larkin

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Measure WM8731 (and SGTL5000) CODEC ADC's Yesterday 10:24 PM
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12-11-2016