In the late 1930s broadcasters, motion picture companies, and the telephone industry all got together to hammer out a standard that could be used for all audio signal measurement needs.

With an FM broadcast, slight changes in amplitude don't matter -- since the audio signal is conveyed through changes in frequency, the FM receiver can just ignore changes in amplitude. The result ...

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Others are vast, stretching out to space itself. The Signal, an eight-part audio drama from Audible and Fresh Produce Media that debuted on Audible in December, is somewhere in between.