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Thread: Converting DSD to Flac?

  1. #16
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    40,648

    Re: Converting DSD to Flac?

    1. 88KHz is a non standard audio frequency, not everything plays it in comparison to 96KHz
    2. You would choose the option in dBpoweramp Control Center: Audio Codecs 'List / Options'

    DSD Decoder >> Decoding Down Sampling

    3. It is possible it will be looked at in the future, I am not aware of any complaints for the quality of DSD decoding.

  2. #17
    dBpoweramp Enthusiast
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    Sep 2007
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    67

    Re: Converting DSD to Flac?

    Quote Originally Posted by Kempy View Post
    in truth it is fs/2 (nyquist theorem)

    With source DSD64 and target fs at 44.1kHz or 48kHz there is no need for a seperate lowpass filter as the signal is steep lowpassed at fs/2 in the SRC process.

    For target fs 88.2kHz and above a steep lowpass filter starting at 30kHz in front of SRC is advisable. I did a little research and found above 26kHz you can't distinguish the music signal from the noise shaped noise, so I lowpassing at 26kHz with a steep filter min. 48dB/octave.

    Advisable free lowpass filters are

    - TDR Ultrasonic Filter (VST2 32 and 64 bit, alpha state but great working, parameters 25kHz, 100%, 100%)
    - sox with: gain +6 sinc -L -26k, also good for SRC, -b 24 rate -v -a 88.2k dither (complete cmd: >source file< -b 24 <target file> gain +6 sinc -L -26k rate -v -a 88.2k dither)

    If you don't want to burn a CD I would stay at 24bit. I'm usually doing DSD64 to PCM 24bit-88.2kHz.

    Don't forget to dither to the final wordlength (16bit or 24bit) as final step.

    G.

    I just saw your response. Thank you.

    Is it safe to assume that the record company that produced the original DSD, 96/24, or 192/24 files filtered out harmful frequencies? Otherwise, buyers could be subjecting themselves or others to potential harm just by playing what they purchased.

  3. #18

    Join Date
    Aug 2020
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    Re: Converting DSD to Flac?

    Quote Originally Posted by Spoon View Post
    1. 88KHz is a non standard audio frequency, not everything plays it in comparison to 96KHz
    2. You would choose the option in dBpoweramp Control Center: Audio Codecs 'List / Options'

    DSD Decoder >> Decoding Down Sampling

    3. It is possible it will be looked at in the future, I am not aware of any complaints for the quality of DSD decoding.
    A few years ago, I used dbPoweramp to convert several DSF files to 88khz pcm files. (I was following advice I saw elsewhere to stick with an even multiple of the DSD frequency - 88khz, 176khz, etc.). But I noticed they did not sound as good as some 96khz flac files of the same recordings that I acquired elsewhere. So, I used dbPoweramp once again to convert from DSF to 96khz 24 bit flacs. Better! To my ears, it seems like there's less of that edgy digital sound in the 96khz FLACs.

    Spoon, I'm curious. Is there an obvious explanation? Or, is this Listener and Sound System dependent?

    Thanks,

    Hugh

  4. #19
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    Re: Converting DSD to Flac?

    Possibly your sound system is better at playing back standard frequencies, ie: 44.1KHz, 48KHz, 96KHz, 176KHz, 192KHz

  5. #20

    Join Date
    Aug 2020
    Posts
    2

    Re: Converting DSD to Flac?

    That sounds like a reasonable explanation. Maybe I'll try recording some LPs at 88khz and 96khz and see if I get the same thing on playback.
    Thanks Spoon.
    Hugh

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