At 3/14/2007 10:43 AM, you wrote: >Guys, an observation: > >I hope the "discriminator equals flat" folks appreciate the mess >they've created with our lexicon. > >Rodney has now been forced to say it like this: > >"This chart shows pin 11 as Filtered Audio Out which is de-emphasised >audio >pre-volume control. If you want straight discriminator (flat) audio out >then >I think you can change the setting for this pin via the RSS." > >De-emphasized audio is, of course, flat audio. There is no tilt in its >response.
Correct. >If this is so, then what is "straight discriminator (flat) audio"? Audio recovered from a frequency modulation detector that hasn't been shaped to remove the pre-emphasis from the transmitted modulation. Unshaped, unfiltered, but not flat. >Since de-emphasized audio is different from discriminator audio, they >can't both be flat. Correct. De-emphasized audio is the "flat audio". >Enough revisionism already. Terms like "flat audio repeaters" are >misleading to anyone not intimately involved in their construction. Correct. Instead of "flat audio", a term such as "unshaped", "unprocessed" and/or "direct FM" should be used instead. Bob NO6B
