Curious spectral analysis

[mas52indy 82]

Just for kicks the other day, I was looking at the frequency spectrum of various tracks from some albums I have in the electronic genre. One particular album had a curious line at around 19.2 kHz in each and every track. Has anyone ever seen anything like that? Since that is way up in the audible spectrum (especially for us old guys), it struck me as somewhat odd. Any speculation as to why that is? Below is a screen shot of one track:

 

 

[dennismiller55 4,812]

This is just speculation on my part.  Computer CRT monitors have a sync frequency is 19.2 KHz.  Do you have a PC monitor close by?

[kve777 6,888]

Subliminal advertising?

[UncleMeat 1,173]

Recorded incorrectly with FM equipment, or is it possible that it's a quadraphonic recording?

 

Quoting Wikipedia on FM Stereo:

 

A 19 kHz pilot tone, at exactly half the 38 kHz sub-carrier frequency and with a precise phase relationship to it, is also generated. This is transmitted at 8–10% of overall modulation level and used by the receiver to regenerate the 38 kHz sub-carrier with the correct phase.

 

The final multiplex signal from the stereo generator contains the Main Channel (L+R), the pilot tone, and the sub-channel (L−R). This composite signal, along with any other sub-carriers, modulates the FM transmitter.

[mas52indy 82]

This is just speculation on my part.  Computer CRT monitors have a sync frequency is 19.2 KHz.  Do you have a PC monitor close by?

 

The analysis was done on a lossless audio file that I didn't rip. I suppose it's possible that the origin rip was accomplished with a CRT (although how many people actually use CRTs on their computers nowadays?) in close proximity. Since I don't know the origin of this file, I will never know. 

[mas52indy 82]

Recorded incorrectly with FM equipment, or is it possible that it's a quadraphonic recording?

 

Quoting Wikipedia on FM Stereo:

 

A 19 kHz pilot tone, at exactly half the 38 kHz sub-carrier frequency and with a precise phase relationship to it, is also generated. This is transmitted at 8–10% of overall modulation level and used by the receiver to regenerate the 38 kHz sub-carrier with the correct phase.

 

The final multiplex signal from the stereo generator contains the Main Channel (L+R), the pilot tone, and the sub-channel (L−R). This composite signal, along with any other sub-carriers, modulates the FM transmitter.

 

 Although this sounds like it could be a plausible explanation, I am pretty sure the source file was CD and not an FM signal. 

[mas52indy 82]

Subliminal advertising?

 

This is a potential concern, not so much advertising but maybe something more sinister. I haven't seen this "phenomenon" on any other albums by this artist. I did notice that this album is a remix of an earlier release. Perhaps the "remixer" inserted something there?