2010.03.07

Audio recording a presentation with a lapel mic

It’s been quite a while since I blogged about audio and video production. So, I’ll take advantage of an email I received from Robin Browne to let this one slip in.

In his email, Robin says he’s been using the internal microphones in his Zoom H2 portable digital recorder to capture presentations with good results and hoping to take it to the next level — excellent audio. He asks for recommendations, perhaps a wireless lapel mic, to get a high quality recording of a speaker at a conference or other such event.

While a wireless lapel mic offers freedom for the speaker, remember that it adds complexity for you as an audio engineer. You’ll need an electrical outlet and an out-of-the-way place to put extra equipment (the receiver station for the wireless mic) in addition to the cabling and audio recorder.

A decent quality wireless lapel mic starts around $500. The good quality ones are more than $800. Contrast that with a good wired lapel mic which is about $300. It’s not ideal to tether the speaker to a spot, however you might be able to work with a willing speaker to limit their movements to a specific area within reach of the cables you buy. By the way, I’m partial to Audio-Technica lapel mics, though I have rented Sennheiser and Shure lapel mics with good results.

Remember that no matter which type of mic system you decide on, always buy good quality cables. This is particularly true if you’re connecting to a mini-plug input like on the Zoom H2 recorder, though it remains true for XLR and quarter-inch inputs as well. Another rule of thumb is to go with the shortest possible cables. Of course, if you think you’ll need a 25 foot reach, don’t restrict yourself to a 10 foot cable — just be sure that you invest in a better quality cable to avoid signal loss.

I’m hoping Bob and I are able to connect to record a new episode of the Canadian Podcast Buffet this week. If so, we’ll talk more about this.

2009.02.11

Do you really know your audio gear?

It’s amazing the thoughts that go through your head when you’re producing audio projects.  As I worked on a project, today, I was transported (for no apparent reason) back to 1995 when Robert Farrell and I were working on demo recordings for what would become his first album.

On one particular occasion, we’d decided to take the quality of our audio recordings to the next level.  I’m not sure how that decision came about.  It was probably me (the Gear-Head that I am) wanting to use some spiffy new equipment even though my own gear was quite good and we’d perfected ways to capture the best sound from various instruments with it.  On the other hand, my tape deck limited us to eight tracks of audio so it may have been that we mapped out the arrangements and decided we needed more tracks.

We regularly rented microphones and effect processors and had on a few occasions even rented ADAT systems — digital tape recording machines that made it possible to record up to eight tracks of audio on each tape.  For this particular demo recording session, we rented a whole mess of equipment including high end Drawmer, dbx and Eventide processors, fantastic mics, preamps and two ADATs.  We made one ADAT system the master and the other the slave which gave us sixteen tracks of audio.

The recording sessions went very well.  Bob’s musical ideas were free flowing.  Combined with my occassional musical idea (or mistake that was turned into an idea) and my lyrics, the sessions were a creative success.  To make the most out of the time with the rented gear, I had programmed the drum machine the night before and then during the session I’d quickly get through my bass parts and then spend my time at the console.

On one particular day, the slave ADAT unit lost its mind.  As we worked on one particular song, the slave unit would get to a certain point in the song and begin rewinding which killed the recording.  It would rewind the entire length of the tape unless we stopped it.  Then I’d have to re-sync the two units and start over, again.  This went on for quite a while — always the exact same moment on the tape, always the same quirky behaviour.  It made recording the song impossible and the session itself amazingly frustrating.

We tried turning the machines off for short periods thinking they needed a break.  Apparently, they didn’t.  This went on for four hours.  Then, just as suddenly as this quirky behaviour had appeared, it stopped and the systems all began to play nicely together.

I’ve always been a Gear-Head.  On reflection, though, despite the improvements in sound quality and sleek new features that new technology offers, the best work I’ve ever done has been with equipment that I’ve spent hours working with.  It’s not just about figuring out what the equipment’s designed to do and how to do it, but how to make the equipment do things the way you want them to be done.

Despite the failings of my M-Audio Firewire 1814 audio card, failings that can only be overcome by using a beta driver that’s two revisions old (M-Audio promised me a fix back in August and fell silent since, which makes sense since it now looks like they’ve discontinued it) and the necessity for a USB dongle to make my Cubase software work, I love my studio.  I love that I’m able to use the same equipment in my home, office and on the road.

Podcasters should be come very close with their audio gear, learn its idiosyncracies, how to work around them and take advantage of them, the sonic qualities of their headphones and speakers and how to refine their production techniques.  Most of all, especially for the important projects, use the gear you know, not the gear that’s cool.

(I may dig through my old tapes and find some recordings I can share.)

2008.04.02

Placing your digital recorder at a remote location

Wired for carcastingHaving a portable digital recorder offers you the freedom to record anywhere you like. This also presents challenges. Nothing ruins a great recording the way electric and radio interference does. These types of interference can overpower what you are actually recording and can sweep across many frequencies including those which are home to voice frequencies. In techie parlance, you’re signal-to-noise ratio will be skewed towards the noise leaving you less signal to work with. You always want strong signal, ideally with no noise. If you have any noise, you want it in the fewest frequencies as with a very low level.

Here are a few pointers for picking a good place to set your sound recorder:

  • Carry an extra set of charged batteries (I use re-chargeables) so that you don’t have to depend on plug-in power. If you record using batteries, warn any guests that you will occasionally be looking at your recorder to make sure it is still running and to make sure the batteries are still strong. Tell them not to be distracted when you do this (some people will think you’re not interested in what they’re saying or that they should be concerned if you’re looking at the equipment). If the batteries do get weak (I wait till my battery light starts flashing since that’s roughly my five minute warning), wait until your guest finishes their current thought before interrupting the session to change the batteries.
  • If you do plug in to the wall at a ‘remote location’, listen to your digital recorder through headphones (if it offers real-time input monitoring) before you start recording to ensure that there are no grounding problems that will impact your recording. If there are grounding problems, unplug your digital recorder and run off the batteries.
  • Don’t place your recorder too close to an electric outlet or electronic equipment.
  • Don’t place your recorder too close to a radio device like a radio or cell phone, or a device that can give off radio interference such as a fluorescent light. If you can’t separate your recorder and cell phone, turn your cell phone completely off. If you can, don’t forget to turn off your cell phone ringer so that it doesn’t interrupt your recording session.
  • In the case of a coffee shop, make sure that your recorder is out of harm’s way. Cups of hot coffee and tea, and glasses of water can really mess up a great electronic device (this is NOT from experience, thankfully).

Do you have any stories about remote recording, problem audio and digital recorders?

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