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Topic: Extremely weird spectrogram of a purchased FLAC file (Read 502 times) previous topic - next topic
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Extremely weird spectrogram of a purchased FLAC file

I've purchased a FLAC album from 7digital. Every single track has a spectrogram that looks like the one attached here (created with Spek). I have never seen anything like it.

Does anyone have an idea what might explain that white noise-like band between 17kHz and 22kHz?



Re: Extremely weird spectrogram of a purchased FLAC file

Reply #1
Probably dithering.

Re: Extremely weird spectrogram of a purchased FLAC file

Reply #2
Considering the sampling is 16-bit, it's most likely from noise-shaping — via dithering or modulation (e.g., DSD, but not likely in this case) for the desired effect of maximizing depth of the audible frequencies.

Re: Extremely weird spectrogram of a purchased FLAC file

Reply #3
I also think it's normal. I join the graph from the same track seen in Audition (also coming from a digital service): the noise is here but seems lighter (probably due to colour scheme).

Re: Extremely weird spectrogram of a purchased FLAC file

Reply #4
Here's another vote for dithering, for whatever it's worth.

Re: Extremely weird spectrogram of a purchased FLAC file

Reply #5
Looks like Izotope MBIT+ or GoodHertz dither. Their noise-shaping has a flat shelf and adjustable strength.

Re: Extremely weird spectrogram of a purchased FLAC file

Reply #6
Thank you all for your responses. There's obviously so much to learn about the topic. Much appreciated.

 
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