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  1. Thread: Fft

    by jremington
    Replies
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    413

    To me, the terms magnitude and amplitude, as...

    To me, the terms magnitude and amplitude, as applied to Fourier coefficients, mean the same thing. What do they mean to you?


    mag[i] = sqrt(vReal[i]*vReal[i] + vImag[i]*vImag[i]);
  2. You will most likely need to wire up the...

    You will most likely need to wire up the connectors yourself. Buy them from distributors like DigiKey, Mouser, etc.

    The UART serial radio modules I have in mind do not come with connectors, for...
  3. 1) You may need a particular connector for the...

    1) You may need a particular connector for the sensor. Check the sensor data sheet.

    2) The Teensy 4.1 has 8 hardware serial ports.

    3) You will probably need to build your own filter. So far,...
  4. If you don't have specific requirements, forum...

    If you don't have specific requirements, forum members can't offer informed advice.

    I suggest to start with the ADC built into any of the Teensies and determine whether that is satisfactory.
    ...
  5. The sensor has a frequency response extending to...

    The sensor has a frequency response extending to over 22 kHz

    With a sample rate of 20 kHz you will need a "brick wall" 10 kHz low pass filter between the sensor and the ADC. Otherwise the data...
  6. Looks good! I recommend to give bicubic...

    Looks good!

    I recommend to give bicubic interpolation a try (it is correctly coded in the driver for the Adafruit AMG8333 module). It is slow, but image appearance is vastly improved over...
  7. Replies
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    5,601

    Hi, All: I recovered a TCD1304DG on separate...

    Hi, All:

    I recovered a TCD1304DG on separate small interface board (standard 74HC04 circuit but with MCP6002 buffer/inverter on the analog output) from a discarded Milwaukee Seawater...
  8. In case anyone is interested, after a number of...

    In case anyone is interested, after a number of experiments I decided that 12 bits/VERY_HIGH_SPEED/100 kHz was too noisy, with obvious sampling artifacts, and settled on 10 bits/HIGH_SPEED.

    I'm...
  9. sample rate jitter with modified adc_pdb example, Teensy 3.2

    I would like to sample a single ADC channel at a constant frequency of about 100 kHz and began with the adc_pdb example.

    I've simplified the example code as well as I understand it, and it seems...
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