Sharing Bob's thoughts! Philip LaMarche LaMarche Enterprises, Inc. www.instantgourmetspices.com www.w9dvm.com 800-395-7795 pin 02 727-944-3226 FAX 727-937-8834 NASFT 30210 W9DVM
________________________________ From: Bob Heil [mailto:[EMAIL PROTECTED] Sent: Tuesday, June 03, 2008 2:19 AM To: Phil LaMarche Subject: It's all about articulation, Phil Hi Phil Thanks for the note about the FLEX page. Always interesting to read some of these things. . . Articulation is the key. Bandwidth has NOTHING to do with it....no matter what frequency range is, the correct BALANCE of those extended low frequencies against the all important articulate mid range is the key - something learned from good ole Bell Labs decades ago. Articulation is the key to the hundreds of thousands of microphones we have designed and produced at Heil Sound since 1982. Now we have brought it to the PRO SOUND and serious recording industry and are turning the world upside down with beautifully balanced super wide range dynamic microphones with gorgeous articulation. Fun times, Phil. Thanks for keeping me up to date. Hope all is well. Bob Heil, K9EID/6 www.heilsound.com/pro/ from Long Beach ----- Original Message ----- From: Phil LaMarche <mailto:[EMAIL PROTECTED]> To: Bob Heil <mailto:[EMAIL PROTECTED]> Sent: Tuesday, June 03, 2008 11:06 AM Subject: FW: [Flexradio] The inherent muddiness of typical amateur transceiver Philip LaMarche LaMarche Enterprises, Inc. www.instantgourmetspices.com www.w9dvm.com 800-395-7795 pin 02 727-944-3226 FAX 727-937-8834 NASFT 30210 W9DVM -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brian C Sent: Tuesday, June 03, 2008 12:47 PM To: flexradio@flex-radio.biz Subject: Re: [Flexradio] The inherent muddiness of typical amateur transceiver > audio without EQ> > Any thoughts? >Edwin MarzanAB2VW According to hams on both sides of the issue, bandwidth is both the problem and the cure, but you can't argue with the modern science of sound, based on almost 80 years of solid research since those outdated telephone studies were created: "By extending telephone bandwidth to 7 kHz and beyond, it is clear that one can markedly reduce fatigue, improve concentration, and increase intelligibility. It is also clear that this improvement is even more significant in real-world room situations, where the sound is often degraded by reverberation, projector or air conditioner noise, accented speech, and other acoustic problems that are encountered in business telephony. Additionally, extending telephone bandwidth below 300 Hz brings a significant increase in presence and realism. In his 1938 paper discussing the bandwidth of the telephone system, AT&T's Inglis noted that, 'Frequency limitation is essentially an economic one, subject to change as conditions change.' Here in the twenty-first century, economics and conditions have changed as Inglis predicted, and modern telephony is now in a position to deliver on the promises of wider bandwidth and clearer speech." http://www.polycom.com/common/documents/whitepapers/effect_of_bandwidth_on_s peech_intelligibility_1.pdf That said, everyone knows wider bandwidths should not be employed on very crowded amateur bands, nonetheless, the key to intelligibility and fidelity is b a n d w i d t h. About 8 KHz is super and 6 KHz is very good. When transmitting through a 3 KHz filter, some kind of EQ is necessary to relieve muddiness, unless the microphone element attenuates the low end dramatically, beginning at about 150 Hz and as long as it has a corresponding rise of about 6 dB at about 2 KHz. Bob Heil knows this and his mic's are designed accordingly. The EQ built into the PowerSDR software does a great job. If the next hardware edition of Flex-SDR has a preamp and 48v phantom power, I'm there. _________________________________________________________________ Instantly invite friends from Facebook and other social networks to join you on Windows LiveT Messenger. https://www.invite2messenger.net/im/?source=TXT_EML_WLH_InviteFriends _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/ _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kb.flex-radio.com/ Homepage: http://www.flex-radio.com/
