On 5/18/2019 4:01 PM, Phil Kane wrote:
Those of us with engineering backgrounds knew that what I was referring to as "pre-distortion" was the pre-emphasis / de-emphasis curves commonly used in FM broadcast audio chains.
All of which emphasizes the need for using the right words to describe things. The word "distortion" is most commonly used to describe non-linearity, not frequency response. And, BTW, that pre-emphasis/de-emphasis is a Standard, not just "commonly used." You know the Regs far better than I, but I suspect it's there too.
As I'm sure you know, it was also common practice to go FAR beyond that, with multi-band dynamics processing and the tricky stuff that Bob Orban was doing. The engineering "rule of thumb" was that if you could see the modulation monitor needle move, you weren't doing enough.:)
I did some research on the Orban FM processor, which I published as an AES Paper in 1986. http://k9yc.com/AESPaper-TDS.pdf
73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
