Audio

My First Raspberry Pi Project: Using Hifi Berry DAC to Emulate A Squeezebox

RPI-HB-DACRCA-300pxSome time ago I received a Raspberry Pi B+ as a gift. It had been on my amazon wish list, and for good reason. It looked like one practical approach to emulating the venerable Logitech Squeezebox, which to this day serves as the basis for music playback hereabouts.

Since we were not expanding our music playback scheme there was at first little motivation to got ahead with this effort. That is, until the analog outputs of our existing fleet of Squeezeboxes started to fail. Eventually the analog outputs become unusable, the result of failing electrolytic capacitors. Three of our five SB3s now suffer this malady.

So, not long ago I set to the task of emulating a Squeezebox using a Raspberry Pi 2 Model B, a HiFiBerry DAC and a 4 GB micro-SD memory card. To this core I added a suitable case, a power-over-Ethernet splitter and piCorePlayer. All in, this rig cost under $100.

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Recommended Reading: 3D Sound Overview

3D Audio Overview PDFA long time ago, when I was still in school in Toronto, I became fascinated with an obscure form of surround sound recording known as Ambisonics. In researching a paper for school I became smitten by the approach conceived by English mathematician Michael Gerzon. It’s a truly elegant system, something beyond the commercially successful surround sound approaches that we all know.

I was especially impressed with the Cowboys Junkies 1988 album, The Trinity Session. It was recorded in a old church on King Street in Toronto, in a single day. The band played in this place with incredible acoustics, ringed around a single Calrec Soundfield microphone. The Soundfield microphone is the surround microphone design based upon the theory originally published by Michael Gerzon at Oxford University.

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Evaluating USB Headsets for Interpreters

This is admittedly a deep dive into a niche topic. It stems from work done for ZipDX, but is more technical than most audiences can stand. Nonetheless, those of you who frequent these waters may find it interesting.

plantronics-blackwire-c320-usb-headset.jpgWhy Do This?

One of the more fascinating aspects of my work at ZipDX involves the interpreters engaged in the use of our multilingual conference capability. These people, who are located all over the globe, are simply fascinating people. They have incredible skills with languages, and finely tuned sensitivity to the nuance of cross-cultural communication. It’s positively inspirational to hear them at work, and very gratifying to support them in their work.

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Crazybaby Mars Levitation Bluetooth Speaker

Crazybaby-Mars-SmallNormally I would not grace this sort of thing with my time or attention. However, I think that the Mars levitating Bluetooth wireless speaker from Crazybaby is a triumph of style-over-substance. That alone inspires at least a quick examination of the product. I’m curious to ascertain it’s raison d’etre.

Most of the active component of the device seem to be housed in the flying saucer-like part of the system called the “Craft.” It literally levitates on a magnetic field, 20mm above the base, when in operation.

When the device is off the Craft settles down on top of the base, which allows for “Wireless Smart Charging.” When turned on the Craft hovers above the base until the battery fades. It’s quoted as lasting 6 hours.

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The LifeSpan Of A Yeti

Last week my Blue Microphones Yeti became completely unresponsive. A USB-connected microphone, when I connected it to my desktop Windows reported that the device was unrecognized. Digging into the device manager on the OS, I found a device connected, but…

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A Microphone Deep Dive: Part 1 – Frequency Response

Last week, in response to Chris Koehncke’s blog post, I set about creating a couple of sample recordings to support my belief that a headset trumps a laptop’s built-in microphone. Along the way I came to a couple of realizations, or perhaps I should say remembrances, of things that I hadn’t thought about in a long while. There are numerous subtleties to the matter of microphones.

SONY DSC

Microphones, like most things, are built to address specific applications. There are microphones for recording studios. Microphones for stage performers. Microphones for board rooms. Microphones for mobile phones. Even a microphone for that cheesy tape recorder that you bought at Radio Shack back in the 1980’s when it was still a great gadget shop.

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