Quote:
Originally Posted by Five
what year is this one? seems like FM>analog>fx>silver>?extraction>flac kind of thing. doesn't resemble MD, only LP4 cuts off like that but if that were the case there would be big rectangles missing below 15kHz (see here). |
I'd go with FM broadcast, just from looking at it. The FM transmission system is limited to 15kHz and it brickwalls. There's never much above that anyway... try filtering to get just 15k-20k from a CD one day and listen to it... if you can hear it. Hardly anything up there. Strictly icing on the case for the main audio. Analog transmission would be so noisy up there, they just decided to lop it off when FM Stereo was created.
Usually, you'd see the 19kHz pilot tone (sinusoidal) there that tells the receivers to decode the differential mux into L and R... but not if the station switched the pilot off.. also, some (good) receivers will filter the 19kHz before output.. so you'd have all that noise up there from the demuxing process if the signal was poor.
No members have liked this post.