Sort of a "benchmark" for essential audio bandwidth is to consider the current practice in the A.M. broadcast industry, at least in the USA. A recent report in "Radio World" notes that most analog A.M. broadcast receivers today have a bandwidth of less than 5 kHz.
Listener tests showed that most people were not aware of a difference when the bandwidth of speech or music, including classical music, was reduced from 10kHz to as little as 7 kHz. Of course there is not a lot of classical music broadcast on A.M. these days. So if you enjoy music on your A.M. radio, note that it's unlikely your radio is reproducing much of anything above 5 kHz. That's especially true of car radios that suppress the higher frequencies to reduce background noise on weaker A.M. stations. 73, Ron AC7AC ______________________________________________________________ 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
