Audio issues for external cam set up at DVinfo.net

Mark Jackson · October 21st, 2003, 06:37 PM

First time poster...so here goes.

I'm running a SONY DCR-TRV-340.

The 'external' or 'helmet' cam is by www.jonescam.tv
The 480EX Pro. It's about 3-times the size of a lipstick
case. The 'mic' they sent was a lapel type mic. Using the
a/v in-out mini-plug from the Sony, I plug the yellow
composite RCA and use the Red for audio(per Jones).
Both require battery power, which is supplied. Switch
the camera to VCR and voi-la! You've got vid and....ugh!
some very distorted sound.

I'm recording moving automobile on race-track. The sound
of wind noise, motor, and most notably the exhaust, just
pounds the lapel mic into submission.

Without getting into cumbersome mixers, I'm wondering
if it's a line level problem in the mic vs. Sony issue. I've
brought mixers into the equation with directional and
condensor mics to no avail. I can limit the distortion by
operating the mic channel to just at 1, and the mixer output
to barely one as well, but what's the point? A mixer that is
almost turned off...? Furthermore, I really can't have a mixer
sized piece of gear in the car. The tracks I race on won't allow
it. It's got to be small and secure to the car. Just trying achieve
some semblence of decent audio. There's GOT to be an easier
(and cheaper) way.

This is pretty much the same idea/set-up that NASCAR, Formula
One, and a host of other 'Race' types use that I watch on
SpeedTV, but without distortion.

Any and all input/ideas are welcome.

Mark in sunny Florida

Jeff Donald · October 21st, 2003, 09:59 PM

Where is the lapel mic mounted?

Mark Jackson · October 22nd, 2003, 07:40 AM

I've tried numerous locations. Always inside the car, but in the
back, behind the seat, on the floorboard.

The distortion is not so much as if you had the volume too loud
to cause it, but rather that serious 'break-up' distortion.

Jon McLean · October 22nd, 2003, 02:07 PM

If the problem is overloading of the mic, I wonder if a dynamic mic might fair better with loud noises(such as a V8 doing 6500rpm :) ).
You might have to insulate from the car body using soft foam so its not in 'direct' contact with the car body and locate it away from any air flow sources.

Mike Rehmus · October 22nd, 2003, 09:16 PM

Having driven a race car a few times, the problem is, well, you are in a race car. No way around that.

A lavaliere microphone unless it is a dynamic unit, just cannot cope with the noise and vibration. If you could borrow something like a Shure SM58 or similar dynamic microphone, get a fuzzy windscreen around it and mount it in a shock mount, you might get some acceptable sound. The double shock mount (the microphone capsule is internally shock mounted will probably take care of the vibration issue.

The only problem with the microphone might be if you stop suddenly, it may continue on and they are fairly heavy.

Which might point you towards a dynamic lavaliere like a Shure Model 11.

October 21st, 2003, 06:37 PM	#1
Mark Jackson Tourist Join Date: Oct 2003 Location: St. Petersburg, Florida Posts: 2	Audio issues for external cam set up First time poster...so here goes. I'm running a SONY DCR-TRV-340. The 'external' or 'helmet' cam is by www.jonescam.tv The 480EX Pro. It's about 3-times the size of a lipstick case. The 'mic' they sent was a lapel type mic. Using the a/v in-out mini-plug from the Sony, I plug the yellow composite RCA and use the Red for audio(per Jones). Both require battery power, which is supplied. Switch the camera to VCR and voi-la! You've got vid and....ugh! some very distorted sound. I'm recording moving automobile on race-track. The sound of wind noise, motor, and most notably the exhaust, just pounds the lapel mic into submission. Without getting into cumbersome mixers, I'm wondering if it's a line level problem in the mic vs. Sony issue. I've brought mixers into the equation with directional and condensor mics to no avail. I can limit the distortion by operating the mic channel to just at 1, and the mixer output to barely one as well, but what's the point? A mixer that is almost turned off...? Furthermore, I really can't have a mixer sized piece of gear in the car. The tracks I race on won't allow it. It's got to be small and secure to the car. Just trying achieve some semblence of decent audio. There's GOT to be an easier (and cheaper) way. This is pretty much the same idea/set-up that NASCAR, Formula One, and a host of other 'Race' types use that I watch on SpeedTV, but without distortion. Any and all input/ideas are welcome. Mark in sunny Florida

October 21st, 2003, 09:59 PM	#2
Jeff Donald Warden Join Date: Mar 2002 Location: Clearwater, FL Posts: 8,287	Where is the lapel mic mounted? __________________ Jeff Donald Carpe Diem Search DVinfo.net for quick answers \| Where to Buy? From the best in the business: DVinfo.net sponsors

October 22nd, 2003, 09:16 PM	#5
Mike Rehmus Wrangler Join Date: May 2002 Location: Vallejo, California Posts: 4,049	Having driven a race car a few times, the problem is, well, you are in a race car. No way around that. A lavaliere microphone unless it is a dynamic unit, just cannot cope with the noise and vibration. If you could borrow something like a Shure SM58 or similar dynamic microphone, get a fuzzy windscreen around it and mount it in a shock mount, you might get some acceptable sound. The double shock mount (the microphone capsule is internally shock mounted will probably take care of the vibration issue. The only problem with the microphone might be if you stop suddenly, it may continue on and they are fairly heavy. Which might point you towards a dynamic lavaliere like a Shure Model 11. __________________ Mike Rehmus Hey, I can see the carrot at the end of the tunnel!

October 22nd, 2003, 07:40 AM	#3
Mark Jackson Tourist Join Date: Oct 2003 Location: St. Petersburg, Florida Posts: 2	I've tried numerous locations. Always inside the car, but in the back, behind the seat, on the floorboard. The distortion is not so much as if you had the volume too loud to cause it, but rather that serious 'break-up' distortion.

October 22nd, 2003, 02:07 PM	#4
Jon McLean Regular Crew Join Date: Feb 2003 Location: Palmerston North New Zealand Posts: 44	If the problem is overloading of the mic, I wonder if a dynamic mic might fair better with loud noises(such as a V8 doing 6500rpm :) ). You might have to insulate from the car body using soft foam so its not in 'direct' contact with the car body and locate it away from any air flow sources.