Hilo Loopback (ARTA measurements baseline)

Discussion in 'Audio Science' started by OJneg, Sep 27, 2015.

Tags:
  1. OJneg

    OJneg The Most Insufferable

    Friend BWC
    Joined:
    Sep 25, 2015
    Likes Received:
    3,883
    Trophy Points:
    113
    Location:
    Denver
    Below is an outline of what your measurements should look like (more or less) in ARTA. I'm guessing most will be trying to use ARTA. It does have some quirks. Marv, feel free to add this to Posting Standards as an example.

    BASELINE
    1. 1kHz spectrum -1dBR (from full scale) 48k sampling, linear 0-24k
    2. 1kHz spectrum -90 dBR 48k sampling, linear 0-24k
    3. 1kHz spectrum -60 dBR 48k sampling, linear 0-24k
    4. 1kHz spectrum -1dBr 48k sampling, linear 0-1.1k
    5. 19k + 20k (1:1 -1dbR) -1dBr 48k sampling, linear 0-24k
    6. 19.1kHz -1dBr 192k sampling, linear 0-85k
    7. PN white noise. Wide band view to note extension and nature of filter slope. -4 dBR 192k sampling, linear 0-85k [Does not function with ARTA loopback since A/D and D/A are synced to the same sample rate. A/D ideally needs to be 2x the D/A sample rate to get useful information here]
    OPTIONAL
    1. 700 and 1700Hz two tone -1dBr 48k sampling, log 0-24k
    2. Impulse response [Does not work in ARTA]
    3. 1khz -90dbfs waveform 16 bits make sure software is not dithering [No option in ARTA]
    4. 1khz -90dbfs waveform 24 bits [No option in ARTA]
    5. Jitter JTEST 48k. Please describe output (Windows settings, software used, PCM, nature of signal, sampling rate, etc.) and audio input settings.
    NOTE:

    • For multi-tone measurements, I don't see anyway to set to -1dBFS. It defaults to -6dBFS.
     

    Attached Files:

    Last edited: Sep 27, 2015
  2. Luckbad

    Luckbad Traded in a unicorn for a Corolla

    Friend
    Joined:
    Sep 27, 2015
    Likes Received:
    3,459
    Trophy Points:
    113
    Location:
    Laguna Hills, CA
    Home Page:
    Thank you for this. When I can pick up decent measurement equipment again (TheGame is getting my ZxR and I'm trying to sell my Scarlett 2i4), I'll get the measurements right.
     
  3. firev1

    firev1 Friend

    Friend
    Joined:
    Sep 27, 2015
    Likes Received:
    45
    Trophy Points:
    18
    Location:
    Singapore
    Pointed it out in the other thread but shall do so here too.

    White noise playback is at 44.1khz but sampling for ADC is 192khz
    Same goes for 19.1khz tone so as to look at 25khz aliasing distortion.
     

Share This Page