VideoHelp Forum

+ Reply to Thread
Results 1 to 17 of 17
Thread
  1. I have a low quality mono mp3 voice 24 kHz, 48 kbps CBR, 32 bit float that I use as input for farther audio editing: first convert to pcm_f64le than upsample to 48 kHz, EQ, mixing with other pcm_f64le inputs. There is no noise there.

    Is there anything I can do to make it better? I mean add dithering, audio super resolution or anything else?
    Quote Quote  
  2. Member
    Join Date
    Mar 2008
    Location
    United States
    Search Comp PM
    Post a sample here to the thread
    Quote Quote  
  3. Originally Posted by davexnet View Post
    Post a sample here to the thread
    See the attachment.
    Image Attached Files
    • File Type: mp3 1.mp3 (11.5 KB, 13 views)
    Quote Quote  
  4. Member
    Join Date
    Mar 2008
    Location
    United States
    Search Comp PM
    I heard a little sibilance, what "improvement" do you think it needs?
    Quote Quote  
  5. Ideally, apply a voice super resolution neural net that upsamples it to 48 kHz. Maybe add some dithering, I'm not sure. Reducing that little sibilance can only make it worse.
    Quote Quote  
  6. Member
    Join Date
    Mar 2008
    Location
    United States
    Search Comp PM
    Do you have any software in mind that does this? I've never heard of any software that has 'super resolution neural net" for
    something as basic as increasing the sample rate. Usually the dither is done when the bit depth is downsized,
    for reducing the sample rate, an anti-alias filter is usually applied

    I have an old copy of Sound Forge, I haven't tried it, but I wouldn't expect the up-sample to be detrimental to the sound .
    Last edited by davexnet; 29th Aug 2021 at 18:16.
    Quote Quote  
  7. I'm a Super Moderator johns0's Avatar
    Join Date
    Jun 2002
    Location
    canada
    Search Comp PM
    The voice sounds good enough for me,any adjustments wouldn't give it any difference in quality.
    I think,therefore i am a hamster.
    Quote Quote  
  8. Originally Posted by davexnet View Post
    Do you have any software in mind that does this?
    https://paperswithcode.com/task/audio-super-resolution

    Originally Posted by johns0 View Post
    any adjustments wouldn't give it any difference in quality.
    You're probably right.
    Quote Quote  
  9. Member
    Join Date
    Mar 2008
    Location
    United States
    Search Comp PM
    I don't think there is any working software available yet, might have
    been interesting to play around with.
    Izotope RX are using neural networks in some of their modules,
    such as music rebalancing
    Quote Quote  
  10. Originally Posted by davexnet View Post
    Izotope RX
    Thank you, that's what I need. Their spectral recovery does exactly what I wrote above.
    It turned out to be quite a powerful program. Do you know if they have a tool for removing that "little sibilance"?
    Quote Quote  
  11. Member
    Join Date
    Mar 2011
    Location
    Nova Scotia, Canada
    Search Comp PM
    If the voiccve was recorded with a cheap mic, which is almost always the case, no software is going to make it sound like an audiophile recording.
    Quote Quote  
  12. Member
    Join Date
    Mar 2008
    Location
    United States
    Search Comp PM
    Originally Posted by qo4on View Post
    Originally Posted by davexnet View Post
    Izotope RX
    Thank you, that's what I need. Their spectral recovery does exactly what I wrote above.
    It turned out to be quite a powerful program. Do you know if they have a tool for removing that "little sibilance"?
    Their de-ess module
    Quote Quote  
  13. I used ffmpeg for upsample it to 48 kHz like `aresample=48000:resampler=soxrrecision=33`.
    But Izotope has a curve instead. Do you know what settings should I use in this case?
    Quote Quote  
  14. Member
    Join Date
    Mar 2008
    Location
    United States
    Search Comp PM
    Izotope know what they're doing but I'd like an explanation on that also.
    My understanding was that the anti-aliasing filter was only required when
    when the sample rate was lowered, yet the filter in rx doesn't make it clear
    Quote Quote  
  15. That's what I think too, but I'm not sure. I can't imagine any reason why I should cut off some of the upper frequencies when upsampling. Do you know anything about Pre-ringing?
    Quote Quote  
  16. Member
    Join Date
    Mar 2008
    Location
    United States
    Search Comp PM
    Originally Posted by qo4on View Post
    That's what I think too, but I'm not sure. I can't imagine any reason why I should cut off some of the upper frequencies when upsampling. Do you know anything about Pre-ringing?
    Not really, I'm reaching my limit on this stuff. There are others in the forum who may respond,
    might have to be patient, or start a new thread with a more relevant title
    Quote Quote