On Tue, 27 Apr 2010 22:49:14 -0400, Lu Romero wrote: >While I agree in principle, in practice, there are some high >frequency sibilance "formants" that need bandwidth up to and >including 2.8kHz to almost 3kHz to be well understood. >There are also some harmonics, especially in male voices, >that go down below 300-400 Hz.
YES. Because I've made my living designing sound systems for highly reverberant churches, this is something that I've had to carefully study. It is VERY well known that the most important octave bands for speech intelligibilty are the octave bands centered on 1,000 Hz and 2,000 Hz. Those bands range means from about 720 Hz to about 2.8 kHz. The 500 Hz is next most important (extending down to about 350 Hz), followed by the 4000 Hz octave band. Human knowledge about this is VERY well established, and dates back to the earliest days of telephony. That's why it's so important to boost the mic response to compensate for the rolloff by crystal filters between 2 and 3kHz! 73, Jim Brown K9YC ______________________________________________________________ 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
