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    For this I have been working on Ethernet. A UDP...

    For this I have been working on Ethernet. A UDP connection via the Ethernet breakout board.
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    THD of audio equipment is measured by rejecting...

    THD of audio equipment is measured by rejecting the fundamental. That way a scope is fine too.
  3. That would be great.

    That would be great.
  4. Somehow I missed this topic, but this looks...

    Somehow I missed this topic, but this looks great!

    Are these PCBs for sale, or even the ready made populated PCB. I would like to buy a handful.
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    High quality audio codecs are benificial for...

    High quality audio codecs are benificial for non-music project too! Like ultrasoon, active noise cancelation and hydrophone projects.
  6. This would be great. LabVIEW is a great way to...

    This would be great. LabVIEW is a great way to program DAQ programs. It looks a bit like the sound toolbox for teensy. These days there is a free version of LabVIEW availed and I can’t wait to use...
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    Yeh, thanks for updating this lib��

    Yeh, thanks for updating this lib��
  8. Very cool��

    Very cool��
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    No. The adc shouldn’t increase current...

    No. The adc shouldn’t increase current consumption but only draw a few uA.
  10. Thread: Audio to UDP

    by tschrama
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    Any progress on this? Please let me know if...

    Any progress on this?

    Please let me know if you succeed!
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    True, better use 3.3V supply to stay save.

    True, better use 3.3V supply to stay save.
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    Or 6V via 180R to the sensor, to gnd. The ADC...

    Or 6V via 180R to the sensor, to gnd. The ADC connected to the sensor will give readings between 0.3 and 3.0 Volt.
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    I would asume you would. need a constant current...

    I would asume you would. need a constant current source to feed the sensor. The voltage across the senaor will then be lineairy depended on the sensors resistance.. being 20R to 180R. A constant...
  14. I would model it as a series of impulses, being...

    I would model it as a series of impulses, being the explosions in the the cylinders. Then a whole lot of high Q filter to model the transfer function of the cylinder + exhaust. Then increase the...
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    I see no problem with averaging 4000 samples,...

    I see no problem with averaging 4000 samples, allthough 256 should be enough to get the StDev down to 2^-15 FS . I regulairy average traces of 40e3 samples, sampled at 200MHz with a 14bit ADC,...
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    When I mean 16bit performance, I mean performance...

    When I mean 16bit performance, I mean performance equivalent to a typical 16bit ADC IC. Once you get standard deviation of about 2^-15 FullScale, by averaging multiple sample, (e.g. 256 or so) you...
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    I am sure you can get St.Dev down to 1 with a...

    I am sure you can get St.Dev down to 1 with a larger oversampling number, like 128 or so. Then you would have 16bit performace.
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    Great work, but I am very curious how the ADC...

    Great work, but I am very curious how the ADC performs with a low impedance source, likr 10R or so. A real low noise stable, low impedance source..... cannt you repeat this with a much larger...
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    Thanks Jnor! For a measure of DC value, I...

    Thanks Jnor!

    For a measure of DC value, I would definitely choose Median.

    You might get a more realistic value by averaging the centre 3, 4, 5, bins or so.

    But excluding those single count...
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    Thanks for sharing, that is good work! And I...

    Thanks for sharing, that is good work! And I agree, there isnot enough noise at the ADC input. Too bad there is no 16bit mode.

    Do you have a teensy 3.2, 3.6 with which you could repeat this...
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    A histogram of the raw ADC values, with that...

    A histogram of the raw ADC values, with that 1000uF in place would tell alot about the ADC performance.
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    You could put large capacitor from ADC input to...

    You could put large capacitor from ADC input to gnd, e. g. 1000uF. That would provide a low impedance to the ADC input for audio frequencies.
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    How 'better' exactly? PS, did you bandwidth...

    How 'better' exactly?

    PS, did you bandwidth limit the adc input?
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    THx, will look at this!

    THx, will look at this!
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    'To get from 12 bits to 16, I multiply by 16 and...

    'To get from 12 bits to 16, I multiply by 16 and add dither.'


    Adding noise after an ADC does no good, but increasing noise.
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    This: 'Median and mode are better measures of...

    This:

    'Median and mode are better measures of central tendency in those cases---although neither increases the resolution of the data. Instead, they act to reduce the noise level in relation to...
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    Median is a non-linear operation and therefore...

    Median is a non-linear operation and therefore cannt be used in system-analysis. But it is a excelent method to ignore large sudden signal deviations originating form an intefering process.

    So for...
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    This has nothing to do with teensy. It is very...

    This has nothing to do with teensy. It is very basic signal. processing material. I am not going to do your homework and I am certainly not to put any efforts in teaching you.
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    Where did you get that from? Not only are you...

    Where did you get that from? Not only are you contradicting your self (HF noise is by definition not white). But it is nonsense too.

    I do it every day.
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    you sum all 256 measurement values, and divide by...

    you sum all 256 measurement values, and divide by 256.
    conviniently, dividing by 256 is the same as bitshifting by 8 which is mucj faster then actual division.
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    if you average 256 times, you gain 4 bits. 16...

    if you average 256 times, you gain 4 bits. 16 bits dynamic range from a 12bit ADC really is no problem at all at low sample rates.
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    Then it is correlated to the signal. of interest.

    Then it is correlated to the signal. of interest.
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    inteference will average out, unless it is...

    inteference will average out, unless it is correlated to the signal. of interest.
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    You can easely average out a couple of thousand...

    You can easely average out a couple of thousand onbaord teensy ADC readings to get the resolution and noise kevel you require.
  35. Following!

    Following!
  36. awesome. Great news!

    awesome. Great news!
  37. Oh, wait. I see this is for Teensy 3.6, while am...

    Oh, wait. I see this is for Teensy 3.6, while am building uppn the teensy 4.1
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    This looks great. Would you mind sharing Gerber...

    This looks great. Would you mind sharing Gerber files?

    My context is: building a 8 channel, simmultanious 24bit, 96kHz, ADC to Ethernet bridge.

    Ultimat3ly I want to use the ADS1278 ADC, but...
  39. Did you het the PCM1808 ADC working on the teensy...

    Did you het the PCM1808 ADC working on the teensy 4? I am. interested because I am workong on an Audio to ethernet brdge and would like to exoerimemt with the PCM1808 before I go to some multichannel...
  40. OK, got it working. First, I had to bridge my...

    OK, got it working.

    First, I had to bridge my ethernet in my computer, so the teensy sees my DHCP from my home-internet-provider-modem(?)
    Second, I had to change the ethernet library to the...
  41. Today I started experimenting. This code...

    Today I started experimenting.

    This code compiles fine, but halts the ethernet configuration. Do any of you know why?




    / MATLABUDPBroadcastExample.ino
    // Copyright 2016 The MathWorks,...
  42. Just Bumping.... I am about to start working on...

    Just Bumping.... I am about to start working on this task. Any warning, remarks, opinions are welcome.
  43. Audio bridge to Ethernet, is it possible?

    Hi all,

    Your options are welcome on this idea:
    Would it be possible to make a Audio to ethernet bridge on a teensy 4.1?

    Audio will be send from an external ADC using TDM, 100kHz, 24 bits, 4...
  44. That circuit cant work. What opamp are you using?

    That circuit cant work.
    What opamp are you using?
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    Thank you all, that really helps for me to...

    Thank you all, that really helps for me to understand teensy a bit more.
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    Thanks, found it at Line 3071 (omg :eek:) So...

    Thanks, found it at Line 3071 (omg :eek:)

    So part of teensyduino, is making these names available for us to use, instead having to look up the register adress in the MCU manual ?
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    Thanks. I found "PDB0_MOD" section 44.4, on...

    Thanks.

    I found "PDB0_MOD" section 44.4, on page 1111 (no less :eek: )

    So I guess that somewhere, the statement "PDB0_MOD" must be translated to adress " hex 4003_6004" .

    Is this adress...
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    Functions, or statements like 'PDB0_MOD', is...

    Functions, or statements like 'PDB0_MOD', is that arduino langauge?

    Or is that teensyduino?

    How does the compiler know what register to write by PDB0_MOD for a particular MCU chip?
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    Cool project, interested and subscribed!

    Cool project, interested and subscribed!
  50. Thx manituo.

    Thx manituo.
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