On 8/22/2011 3:25 PM, DL5OCD wrote: > It would be a nice feature if the user > could decide by himself if he want to hear down to 0Hz on FM.
Audio down to 0 Hz for speech makes no sense. The lowest frequencies in the human voice are in the 100-200 Hz range (depending on the individual), and frequencies below about 500 Hz make almost no contribution to communications. There are often noise components below 500 Hz, like power supply hum, noise in the shack (or in the car, including wind noise and road noise) microphone handling noise, and breath popping. Not only that, but directional mics EMPHASIZE low frequency sounds very close to the sound source (like the mouth, where pops are generated). For all of these reasons, Elecraft's low frequency rolloff is a good thing, and there are no good reasons not to do it. If Elecraft were to decide to do a setting for hams in areas that don't use low frequency tones, my recommendation would be to move the rolloff down to 150 or 200 Hz. Also, Lyle's suggestion to tweak the rolloff to a steeper slope could be a good idea. 73, Jim K9YC Fellow, Audio Engineering Society ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
