[oldbrokentapes]

Originally Posted by buzzy

On the contrary, that's pretty much what FM broadcasts look like. It wouldn't take NR to do this.
The frequency cutoff may vary a little, though 15khz is most typical.

I have to disagree, and I think I'm with the majority. An FM signal should always show something across the entire range because of the noise/hiss inherant in the medium. I don't know how the sample this thread is about got so completely killed, but there's no way that's a standard FM capture.

The attached images are SBD > FM > WAV (and then > mp3@160kbps) for reference. There is a dip around 16kHz but nothing close to what is being discussed here.

edit - ok, how do I make my image attachments show automatically rather than needing clicking?

edit again, follow up thought - are there radio stations that apply a high frequency band filter pre-broadcast? I can't figure out how that featureless line stays so high around -96dB