Selasa, 28 Januari 2014

What kind of external mic do I need?

Q. I have a Cannon ZR40 camcorder and I would like to have an external microphone of some sort for a movie that I'm shooting outside between two people. I want a better quality microphone when It comes to the sound interference outside that the camcorder microphone would pick up. Yet I'm not sure what kind I need. I'm trying to make a makeshift boom pole with the mic. What would I need that isn't too expensive?

A. There are two ways you can go...

1) a Shotgun mic can work well - but it presumes the two people are pretty close to each other. In addition to the mic and the boom pole, you probably want to use something like a Sabra SMM-1 universal shock mount... and a zeppelin (also known as a "dead cat"). Rykote makes a good one - but they are expensive. You may be able to make one. do a search for "zeppelin". Even if there is NO wind that you can feel outside, there is some wind. Since the distance of the mic cable will probably need to be over 15 feet, you want to use a shotgun mic that uses XLR (balanced) connectors and cabling. Since the ZR40 has a 1/8" jack, an XLR adapter will be needed - I would suggest something like those from BeachTek like the DXA-6vu. I don't know if the ZR40 has manual audio control - if not, then the DXA-6vu will provide it - if so, you might be able to get away with just a XLR-1/8" jack cable adapter. On the affordable side, NRG Reasearch makes a nice unit in the SA-568. Audio Technica makes several good ones... they can get expensive. Sennheisers are my favorite to work with.

2) A wireless lavaliere (clip on) on one or both people speaking would also work well and the mics can go under clothing (but not under heavy jackets). Shure and Sennheiser make good ones. They are expensive. You need to tape the mic to the person's chest (hidden) using moleskin or some other adhesive so their skin does not get torn off. And the body pack slides on a belt on their pants. The base stations can be either 1/8" or XLR, so whether you need the XLR adapter or cable will be dictated by the connectivity the base stations need.


How can I remove microphone hiss?
Q. I am trying to record my friends and I playing board games. I have bought a Sony CX380 camcorder for HD video, CAD GXL3000 condenser microphone (for picking up our voices that are about 3-5 feet away), and a Behringer Xenyx 802 mixer (to power the Microphone through Phantom power). No matter what settings I put my camcorder, microphone, and mixer to, I get a lot of hiss in the recording. Has anyone had this happen and how did you solve this problem? I know the camcorder has plug-in power (PiP) but I can't find evidence on any forums that suggest this could be a problem and there are no settings that I could find in the camcorder to turn off PiP.
Also, I want to fix the problem at the source. Using programs for 'Noise Reduction' alter the sound file slightly and cause de-synching with the video.

A. The problem is in using the microphone jack of the recorder to accept the output from the mixer. The microphone input is designed for the low level signal of a microphone - the mixer is line level. No matter how you adjust the mixer, the camcorder is going to record the noise floor of the mixer.

One work-around would be to use an attenuating patch cord between the mixer and the camcorder.

The other would be to use the external Sony stereo microphone, which is what the PIP is provided for. PIP is not the same as the 48 volt phantom power as provided at the XLR connection at the mixer.





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