Re: [MBZ] Looking for audio guy
It seems than at Fri, 7 Sep 2007 17:49:04 -0400, archer wrote: Question: Are there any audio engineers or technicians on this group? Gerry Archer '83 300D and 240D Yeah - why? -- Philip ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Looking for audio guy
It seems than at Fri, 7 Sep 2007 22:37:49 -0400, archer wrote: A microphone array is what I would like to build but I'm not sure about which unidirectional microphones to use. A system of about 12 or 15 microphones which would be positioned around a conference table and connected to a control box with switches that would turn each microphone on and off and control its volume is what I had in mind. I tried cheap microphones but they still picked up too much room noise in addition to the person talking. This is probably mostly a physics problems, so cheap or expensive doesn't matter lots. The very best way is to get the mic closer to the real sound source. Unless you can convince the other folks at the meeting to wear earworn mics (like a Countryman E6, or a similar homebrew), there is a real limit how close you can get to the sources. In order to be sure that a particular microphone would work in these meetings, I would like to buy one, connect it to the headphones via a small amp, and try it in front of the various participants to see if it adequately blocked room noise. If you add one room mic that pics up mostly the room sound, that could then be used by a DSP to subtract much of the room sound - but I'm guessing it would still no be very intelligible _and_ it would probably be pricey. Or I suppose an average of all the off-duty mics could also be used as the room sound. If you could suggest a unidirectional microphone which would eliminate background noise while the person it was sitting in front of was speaking, I'd really appreciate it. I've looked at the websites for unidirectional microphones on the web, but having had little experience, it would be a guess which one to try first; especially since they are fairly expensive; Are you willing to homebrew? Panasonic WM61A is a mic _element_ that's pretty cheap. It is about 0.25 inches (6 mm) in diameter. A stack of these 6 inches long would provide reasonable directional pickup down to about 1 kHz. Good enough for important intelligibility! This line of mic could be position horizontal to isolate a talker from his neighbors. If it is also less than 0.5 inches from the table, it won't be adversely effected by reflection from the table. I have not built such a critter, but some day when I'm bored I would like to. *smile* --Philip ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
[MBZ] Looking for audio guy
Question: Are there any audio engineers or technicians on this group? Gerry Archer '83 300D and 240D ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Looking for audio guy
archer wrote: Question: Are there any audio engineers or technicians on this group? Whatever happened to Jaime? Did he sell his Benz, or just drop off the list? ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Looking for audio guy
On 9/7/07, Mitch Haley [EMAIL PROTECTED] wrote: archer wrote: Question: Are there any audio engineers or technicians on this group? Whatever happened to Jaime? Did he sell his Benz, or just drop off the list? Kopchinski? I wonder that too. His web site http://www.jaimekop.com/ hasn't been updated in years. (Still good reading, though, especially his story of going to fetch the brakeless Saab 96). Alex Chamberlain ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Looking for audio guy
Well I worked for Ericsson for 2-3 years as an audio engineer, but I am no means an audiophile... My former training is signal processing, electrical engineering, computer engineering, and so in statistics and classifier design. My passion is embedded system design and rapid prototyping of electronic gadgets. The last one I just finished was a microphone array. Trampas -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of archer Sent: Friday, September 07, 2007 5:49 PM To: Mercedes Discussion List Subject: [MBZ] Looking for audio guy Question: Are there any audio engineers or technicians on this group? Gerry Archer '83 300D and 240D ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Looking for audio guy
I'm the opposite of Trampas, I'm an audiophile but not an engineer. What's the Q? Jeff Zedic ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Looking for audio guy
I'm neither one, but am full of unfounded opinions on subjects that I know only a little about. Ask away! On 9/7/07, Jeff Zedic [EMAIL PROTECTED] wrote: I'm the opposite of Trampas, I'm an audiophile but not an engineer. What's the Q? Jeff Zedic -- OK Don, KD5NRO Norman, OK There are three kinds of lies: lies, damn lies, and statistics. -Benjamin Disraeli '90 300D, '87 300SDL, '81 240D, '78 450SLC, '97 Ply Grand Voyager ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Looking for audio guy
I sent the question direct to Trampas, thinking he was the only engineer/technician. Here's what I wrote him: A microphone array is what I would like to build but I'm not sure about which unidirectional microphones to use. A system of about 12 or 15 microphones which would be positioned around a conference table and connected to a control box with switches that would turn each microphone on and off and control its volume is what I had in mind. I tried cheap microphones but they still picked up too much room noise in addition to the person talking. I would use a headset and switch between the participants as each spoke. I have a hearing loss which prevents me from understanding the participants at meetings unless they have a loud, distinct voice. In order to be sure that a particular microphone would work in these meetings, I would like to buy one, connect it to the headphones via a small amp, and try it in front of the various participants to see if it adequately blocked room noise. If you could suggest a unidirectional microphone which would eliminate background noise while the person it was sitting in front of was speaking, I'd really appreciate it. I've looked at the websites for unidirectional microphones on the web, but having had little experience, it would be a guess which one to try first; especially since they are fairly expensive; Sennheiser ME66 Short Shotgun Capsule $219.00; for example. Also, if you could suggest an amplifier pc board with a volume and tone control or a schematic for one, that would be a great help. I've been building such things for years so construction would be no problem. I have all the Engineers notebooks from Radio Shack which have circuits that could be used but their frequency ranges may not be broad enough for this project. The entire system would need to fit into a small suitcase or equivalent since it would be carried around to meetings at various places. The typical control box sold at music stores, for example, would probably be too big to carry around and wouldn't have enough circuits for all the microphones. Sincerely, Gerry Archer '83 300D and 240D P.S. If this system solves the problem, I would like to add headphones for other members who cannot attend meetings because of hearing loss. --- - Original Message - From: OK Don [EMAIL PROTECTED] I'm neither one, but am full of unfounded opinions on subjects that I know only a little about. Ask away! On 9/7/07, Jeff Zedic [EMAIL PROTECTED] wrote: I'm the opposite of Trampas, I'm an audiophile but not an engineer. What's the Q? Jeff Zedic ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Looking for audio guy
I run a recording studio on the side...or at least I did before the fuel and utility prices went nuts. Now all the broke musicians are REALLY broke and business is slim at best. We specialize in recording all acoustic stuff so I know very little about noisy distortion effects or any of that midi and loop stuff ( and don't care to ), just seriously clean realistic recording here. What are you needing to find out? Robert archer wrote: Question: Are there any audio engineers or technicians on this group? Gerry Archer '83 300D and 240D ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Looking for audio guy
Sounds like a very worthwhile project. First - (and remember, I'm the one with a little knowledge, and lots of opinions) - you can limit some of the room noise by filtering the audio down to the frequency range needed for voice communication - around 3kHz. Do this in the pre-amp stage. I expect that the current method of resolving the rest of the problem would be a DSP stage to sample and invert the background audio, canceling it out - but that's way beyond me at this point. I wonder if one of the noise canceling headphones could be hacked to remove the same noise from the mike feed that it does from ambient? You were right to ask for an audio engineer - -- OK Don, KD5NRO Norman, OK There are three kinds of lies: lies, damn lies, and statistics. -Benjamin Disraeli '90 300D, '87 300SDL, '81 240D, '78 450SLC, '97 Ply Grand Voyager ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Looking for audio guy
- Original Message - From: OK Don [EMAIL PROTECTED] Sounds like a very worthwhile project. First - (and remember, I'm the one with a little knowledge, and lots of opinions) - you can limit some of the room noise by filtering the audio down to the frequency range needed for voice communication - around 3kHz. Do this in the pre-amp stage. I expect that the current method of resolving the rest of the problem would be a DSP stage to sample and invert the background audio, canceling it out - but that's way beyond me at this point. I wonder if one of the noise canceling headphones could be hacked to remove the same noise from the mike feed that it does from ambient? You were right to ask for an audio engineer - OK Don, KD5NRO - Interesting ideas. Thanks. Gerry ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Looking for audio guy
See posting to the group; OK Don and Jeff. Thanks, Gerry -- - Original Message - From: Robert Tara Ludwick [EMAIL PROTECTED] I run a recording studio on the side...or at least I did before the fuel and utility prices went nuts. Now all the broke musicians are REALLY broke and business is slim at best. We specialize in recording all acoustic stuff so I know very little about noisy distortion effects or any of that midi and loop stuff ( and don't care to ), just seriously clean realistic recording here. What are you needing to find out? Robert archer wrote: Question: Are there any audio engineers or technicians on this group? Gerry Archer '83 300D and 240D ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
