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Topic: Question about Frecuencies (Read 1292 times) previous topic - next topic
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Question about Frecuencies

Hi everybody,

hopefully I'm posting on the right part of the forum. I'm new here and have a question.

I have the Bob Marley Legend disc downloaded from HDTracks and something is bothering me. When I see at the spectogram, there's a line between the 75 - 80 KHz and also the frequencies only go till the 85 kHz mark. Shouldn't it get to 96 kHz? And what about the line at the 75 - 80 mark. Is there something wrong with the track?

I'm attaching a picture to illustrate.



Hope someone can share some knowledge with me.

Thanks in advanced

Question about Frecuencies

Reply #1 –
Quote from: danieltips on
When I see at the spectogram, there's a line between the 75 - 80 KHz and also the frequencies only go till the 85 kHz mark.


The high frequency tone is some kind of electrical interference, probably during mastering. 

That album doesn't really have much high frequency content.  It looks like the source material was probably low pass filtered at 20kHz. 

Question about Frecuencies

Reply #2 –
Nothing's wrong with the track. You can't hear above 20 KHz anyway. Those lines extending upward well beyond that are artifacts of the randomness of white noise-like sound (snares, cymbals) ... not music. They're also deep purple on the spectrogram, meaning they're at least 110 dB below peak...so even if they weren't being masked by all the content in the lower frequencies you can hear, and even if your ears didn't have frequency limits, those upward-reaching frequency components would still be absolutely inaudible even if you've got the volume cranked loud enough to cause physical pain.

You may want to give http://people.xiph.org/~xiphmont/demo/neil-young.html a read.