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Thread: New to teensy audio, done some audio DIY

  1. #1
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    New to teensy audio, done some audio DIY

    Hi there,

    I feel i am an experienced audio DIY person, but I am new to teensy, and for my first T-A "project" although I guess that's not really a project:

    I got the 4.0 going and recorded some of the audio examples.

    I know this is old hat to a lot of you, but for me, it's been extremely eye opening to start working with this amazing platform.
    I can see almost endless potential here in this extremely affordable rig.

    I mostly blog to help me retain what I think i've learned.....so I'm sure I'll be uploading more soon.

    Please take a look if you have a second.

    https://audiodiwhy.blogspot.com/2020...dio-board.html

    Thanks.Click image for larger version. 

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    Last edited by audiodiwhy; 07-28-2020 at 12:32 AM.

  2. #2
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    Hi good review but I notice you said you had a lot of noise and you are new to Teeny?
    Did you try the HP filter disable? - "adcHighPassFilterDisable();" ?
    Discussed https://forum.pjrc.com/threads/27215...ll=1#post78831
    Last edited by Saibot; 07-28-2020 at 06:44 AM.

  3. #3
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    I also noted you installed the 23LC1024 ram on the audio board for longer delay times.
    It is worth enquiring if it is possible to use PSRAM on a Teensy 4.1 for this, and is it is possible to install PSRAM on the audio board?

    I suspect the info on the PJRC page you referred to needs to be updated for the RAM ratio (1MB vs. 256MB T3x-max) of the new Teensy 4's:
    Alteratively (edit), a 23LC1024 RAM memory chip may be added. The Teensy Audio Library can use the RAM chip for a multi-tap delay line, up to 1.5 seconds. See this demo video for details.
    Last edited by Saibot; 07-28-2020 at 11:02 AM.

  4. #4
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    RAM chip for audio board

    Saibot:

    I have no idea what alternate RAM or FLASH chips will work--I can only say that after installiong the 23LC1024 and increasing the audio memory setting in the "Delay" sketch--and using the ExtDelay object instead of the delay object--1500ms single tap delays seemed to worked fine; for my initial tests I felt that was good enough.

    Beyond that I am afraid I just don't know, I am too new to this platform. Perhaps someone else on the forum or the folks at PJRC would know more.

  5. #5
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    I think the noise was caused by me not setting levels carefully enough, leading to poor headroom, but I will look into the adchighpassfilterdisable() function.

    thanks for the link.

  6. #6
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    Ok I will answer half of my own question - no you cannot use PSRAM on the audioboard because its requires Quad SPI.
    I still do not know if the delay library, with modification, can use the PSRAM on the Teensy 4.1...

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