Brrrrwwwwaaaawwwrrrrrwwwaaar!

This might be harder to find at a thrift store than at an electronics or hobby store, but there are a large number of ultra-small toy helicopters on the market that can be had for not a lot of dosh. They’re flimsy. They don’t fly well. But they do scare the hell out of family pets, which instantly makes them entertaining, and they do make pretty cool sounds.

So, imagine this: You’re only one person with no assistants nearby. These helicopters, well, they fly erratically. How do you keep a mic trained on it to get a good recording? I solved this problem before by putting wireless mics on moving objects, but they’re far to heavy for something like this. Well, let’s just take advantage of the toy’s weak flying ability: Why not just hold the stupid thing while the rotors rotate? The rotors, however, rotate really quickly, and move a surprising amount of air. The body of the helicopter is so teensy that I couldn’t find a good mic position that blocked the air being moved around, which of course creates a lot of distortion and rumble.

Rather than futz around with a bulky windscreen and furry windjammer, I decided to just attach a contact microphone to the helicopter with gaffer’s tape. This worked reasonably well, especially after a quick equalization adjustment to overcome the somewhat dull midrange response of the mic itself. The sound that was transmitted through the high-density foam body was actually more interesting and full than the rotor’s sound in the free air, anyway. Besides the aforementioned EQ pass, this recording is unaltered. Recorded at 192kHz, this could provide all manner of mechanical effects if pitched down or processed further!

[Contact microphone into Sound Devices 702 recorder]

Meet Zippi: Suitable for propeller sounds of all kinds!

It’s been a long time since I’ve done a Thrift Store Sounds post, so let’s take a look at the nifty Vornado Zippi desktop fan!

It features soft cloth blades, a safety feature given the lack of a cage around the hub and its inevitable placement next to coffee mugs, iPads, and human fingers.

The motor’s not very powerful, and that’s really perfect for sound design. You can put your hand on the hub to slow it down. The soft blades let you stick all manner of wacky things in them without damaging the objects or the blades.

Today’s sound, then, is a short takes of sticking a ball-point pen into the fan blades. I think it’s great as a layering element for propeller sounds, be it a steampunk zeppelin or a toy/cartoon aircraft.

(If you want to hear more Thrift Store Sounds, be sure to check out recordings of a wicker basket and a shoe stretcher, or just use the Search too!)

[OktavaMod MK-012 with cardioid cap, inside Rycote Baby Ball Gag windshield, into Sound Devices 702 recorder]

Noise Jockey: Taking the "E" out of "e-bow."

Almost exactly one year ago, I played a steel cable on a gate with an eBow, recorded with contact microphones. I decided to give it a go with a regular bow when I realized that this gate was basically a one-stringed guitar.

Think about it: Wound metal string under tension, wooden resonator. That’s all a guitar really is. What a wooden gate lacks is thickness, like a guitar, but at more than a meter in width and height, that’s a broad-enough surface to send air molecules running for cover.

I had to rosin the hell out of the bow to make it tacky enough to grip this oversized “string.” I found that also spreading rosin on the wrapped steel cable was helpful. I tuned the cable, as much as one can, by adjusting a turnbuckle.

I recorded in mid-side stereo. Today’s sample features is comprised of one mono track totally dry, one mono track run through Michael Norris’ Spectral Blurring effect, one mono track pitch-shifted down by 1.5 octaves, and the one stereo track pitch-shifted down by three octaves. Recording at 192Hz helps for such tomfoolery.

I apologize to my neighbhors for the unholy racket that I’m sure they thought was a demonic violin 101 class.

[Sennheiser MKH 50 and MKH 30 recorded as mid-side stereo into Sound Devices 702 recorder]

Today's lesson: Channelling resonance through a vibrationally conductive chamber!

[This post's title not ringing a bell? Read more.]

As regular visitors to Noise Jockey have read before, I’m pro-drone, and I vote.

Any rich, enveloping tone is like audio heroin to me. Why? It’s definitely psychoacoustic, possibly all alignin’ my chakras ‘n’ such, maybe it’s the resonant frequency of my skull…I have no idea. While they’re easy to synthesize, they’re harder to record in the real world, but can be much richer and full of sonic surprises.

But it’s not like they’re rare. Quite the contrary: Almost anything will resonate under the right circumstances, but thin metals seems to be the best, including commonplace wire shelving units.

In trying to record a set of metal wire shelves in my shed, I started with contact mics, figuring there’d be subtleties to be captured…but putting mics on the thin rods of the shelves prevented them from moving as freely, and it just lacked the character that my ears heard. I ditched the contact mics and moved a large, polycarbonate bear-proof food canister onto a shelf and stuck a hypercardioid mic right at the mouth of the canister. This amplified the sound, added more of overtones, and increased the sound’s sustain.

Today’s sound is an edit of decays and tones from striking these metal shelves with a hammer. I simply edited out all of the transients of the actual hammer falls, and layered many sequences of these resonant tones together, “boomerang-reversing” some of them to get more consistent volume and tone. However, no plugins have been used.

[Sennheiser MKH 50 into Sound Devices 702 recorder]

Sunshine on his shoulder makes him jumpy...

No sound designer can resist sound-making objects, so I did some recent damage at ThinkGeek for some small, inexpensive musical items…but then I noticed the robots.

Sadly,  buying a spendy mechanical robot arm just to record servo sounds seemed like a horrible investment. I learned this lesson last year. ;-)

However, I did get a tiny solar-powered grasshopper kit. An offset actuator in its abdomen makes the whole thing vibrate on tiny wire legs when it’s solar-cell carapace is hit with sunlight or a strong halogen source.

Of course, that would sound tiny and delicate. Which is OK. But how to make that sound bigger? Well, you put it on something that will resonate: Something with air around it that will conduct vibrations easily. (I’ve had loud, racous luck with this before.)

Being a hot, sunny Sunday, I chose the top of my closed Weber grill. I tested the sound with contact mics, but the steel was too thick. Truly, and unusually, where my ears were – close to the top of the grill – was where the best sound was. I switched to a hypercardioid mic in a windscreen, and captured today’s sound.

To accentuate the lovely low-mid resonant tones, I applied a huge -24dB cut at 5.5kHz , where the metallic feet where vibrating against the grill (I still wanted a tiny hint of chatter  in there), tand a +9dB boost at 180Hz. Could make for a nice layer with some other design elements.

[Sennheiser MKH 50 into Sound Devices 702 recorder]

European Starling, hero mutterer and goer-on-forever.

[Photo by donjd2 (CC)]

The European Starling is a common bird that yammers like a manic street preacher. They have a really varied voice, quite expressive for standard birdsong.

I recorded one in my backyard and found that the frequency content really held up well under creative processing (unlike the raspy, high-mid-peaked calls of crows). Today’s sample is a continuous utterance from a starling that’s been pitched down 800 cents and run through the GRM Tools PitchAccum filter, which I just adore for thickening sounds in unusual ways.

For me, it’s evocative of an exotic or alien ecosystem, especially with those other weird R2-D2-like tones in the background…but, again, the vast majority of those tones are being made by a single Starling.

[Sennheiser MKH 50 into Sound Devices 702 recorder]

Magnet + Hydrophone from Noise Jockey on Vimeo. [Did you miss my first video?]

It is what is says, people! ;-) I ducked out some handling noise, but for the most part the audio is unaltered. Enjoy.

I'm killing this platter slowly with a screwdriver, and it never sounded so good.

Nothing puts Moore’s Law in perspective like ripping an 80 gigabyte hard drive out of an enclosure and swapping with a 2 terabyte drive. 80GB isn’t even big enough to act as a Photoshop scratch disk in 2010.

It’s not new ground by any means, but I did get some pretty interesting results, ranging from IDM-like chirps and squeaks to all sorts of weird drive vocalizations when I slowed the platter down with a screwdriver – much to my surprise, the damn thing came to a stop, jittered around, and then spun right back up again. Most of the sounds were pretty subtle (perfect for the MKH 50), surprisingly, but with lots of surprises. [I shot video of the whole thing, a still of which can be seen above, but really, a hard drive spinning is not that interesting. Trust me on this one.]

I had a great time until Chuck Russom suggested on Twitter what might happen if the 7200rpm drive would have come loose…

These sounds have only been normalized and no sound processing has been applied.

[Sennheiser MKH 50 microphone into Sound Devices 702 recorder]

"Sump pump." I mean, ewww. What is "sump," anyway? Sure sounds like it's something in need of pumping!

Our house is very poorly placed on its lot. Since our place is downslope from the street, water runs down the driveway towards the house.  Thankfully, someone long ago put a pretty good drainage system with an electric pump that pumps the water back to the curb, where it can run to a drainage grate in the street.

In the midst of a week of spring rain, I decided to toss the ol’ hydrophone into the drain box and record the pump, which is activated when a bobber reaches a certain height. The drain box is poured concrete, so it’s acoustically reflective. The pump kicking in is my favorite part, sure to be used for something later on. The big dropoff in volume is where the hydrophone was left high and dry when the water level dropped. Notice how the sound of air bubbles become more pronounced as the water level meets the capsule, and then passes by it. Water turbulence right on the capsule tends to be very loud, as it imparts direct mechanical vibrations to the mic element itself.

[Aquarian Audio H2a-XLR hydrophone into Sound Devices 702 field recorder]

I’m pleased to offer the first video content on Noise Jockey, and outgrowth of an earlier post on recording bicycles. More to come.

Audio nerd bonus quiz: This was recorded double system with two microphones. The visible one was for the sound effect itself, aimed at the bike wheel. Where’s the other mic?