Using Spek to see if an audio file is really lossless after doing noise reduction.


I digitized several vinyl LP’s and couldn’t figure out why some FLAC files do not pass the Spek test for lossless. Then I saw that if I do noise reduction based on the vinyl noise between tracks, the Khz of the whole file drops and it looks like it’s not lossless anymore. Do I have to stop getting rid of vinyl noise to have a lossless file? The file sounds cleaner with the noise out but then it looks like an MP3 on Spek!

rff000

I am a semi-professional audio restoration technician.

I hear bright noises from speakers in below. Why the bright noise? Can you make it better?

Acora speaker

Similar noise on the left speaker below.

https://youtu.be/IHf_FSa8amE?si=V9rQePsCBUEkBD8O

Alex/Wavetouch audio

I am a semi-professional audio restoration technician. I have for close to two decades used the following programs-

iZotopeRx Advanced- unparalleled at removing static and impulsive disturbances, some quite gross in nature.

Pristine Sounds 2005- great for spot-clean up

Sound Forge- best all-round digital audio editor lets me perform magic on audio

Acoustica Advanced- has a "remix" function that lets me dodge around some problems.

That doesn't surprise me. I use an older version of Adobe Audition for LP transfers and other audio editing work (though I don't do much these days) and the level of complexity and number of settings in these programs can be staggering.

To answer my own question, I now see that Goldwave noise reduction has many parameters that I don’t completely understand. Each one ends up influencing the results on Spek, so I’ll have to try different settings of Scale, Overlap, FFT size, etc., to make things work.