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Sampling rates restriction to 96 kHz?

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  • HWin

    • Feb 2020
    • 3

    #1

    Sampling rates restriction to 96 kHz?

    I tried Asset UPnP @ Raspi 4 B (8 GB RAM, OS: 64 bit Bookworm light) to feed a network player (only capable of PCM up to 192 kHz, 24 bit, no DSD) with DSD 64 files from Synology NAS. Works well, i.e. Asset UPnP handles transcoding of DSD stream into PCM, but resulting stream is 96 kHz 24 bit. Is there a possibility to set PCM sampling frequency greater than 96 kHz? Goal would be 176,4 kHz for DSD64 stream. How to achieve this?
    Thanks in advance and kind regards
  • Spoon-
    Administrator
    • Apr 2002
    • 46046

    #2
    As DSD is mainly high frequency noise, 96Khz is perfect as the nyquist (of half 96khz) filters it out. I would not use 192khz as you just inject HF noise to the speakers.

    The design of DSD players have to have a low pass filter:

    For Direct Stream Digital (DSD) playback, the Low Pass Filter (LPF) typically has a cutoff frequency set between 30 kHz and 50 kHz, with a steep roll-off (often 48 dB/octave). This specific range is chosen to block the heavy ultrasonic quantization noise inherent to DSD's 1-bit encoding without interfering with the audible frequency spectrum
    Spoon-
    www.dbpoweramp.com

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