Graves On SOHO Technology

While I travel I like to listen to podcasts. While there are a variety of podcasts that are routinely found on my cell phone, I also try new things from The Conversations Network and similar sites.

This evening as I’m on a flight to Raleigh-Durham NC I happened to give a listen to a short podcast from IBM. It was The IBM Institute For Business Value podcast entitled, “The Changing Face Of Communication.” It’s an older podcast, from June 2009.

While this file had been on my phone a while I had thought that it still might be interesting. IBM certainly knows a thing or two about communications. I was at Astricon 2009 when IBM had a keynote address. They also announced a partnership of some sort with Digium.

However, I was startled to hear the audio quality of this podcast. It’s simply atrocious. Seriously. It’s really bad.

Remember Marshall McLuhan? The medium is the message. In this case the medium, poor quality podcast audio, completely destroys the message…and along with it the credibility of the participants.

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Earlier today Doug Mohney of HDVoiceNews issued an interesting tweet;

Briefing with Tier 1 telco on #HDvoice. Product manager started using the useless marketing term #HDaudio. Maybe should use #HDtelephony?

I find myself agreeing with Doug’s assertion that “HD Audio” is not appropriate terminology. “HD Audio” is way too broad a term, and more appropriate used with respect to entertainment than telephony.

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This morning’s news dump finds me distracted by an Engadget story about Audyssey releasing a new AirPlay-capable powered speaker system called “Lower East Side Air.”

This is the second time such an announcement from this company has caused my brow to wrinkle. The first time the company caught my attention was when Tech Crunch reviewed their Lower East Side Media Speakers.

Going beyond the press release I had a look at the companies’ web site for some greater depth on the Lower East Side Air product. I was surprised to find that there really wasn’t anything more to be had.

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Have you ever encountered something that seems a little odd, then find that you are in fact surrounded by examples if it in your daily life. So it is with “Beam Forming.” You may never have heard of it, but it’s all around you, and it’s more than a little interesting.

Wikipedia tells use that, “Beam forming is a signal processing technique used in sensor arrays for directional signal transmission or reception.” It is essentially a way of using an array of omnidirectional sensors to synthesize directionality.

Cast into the audio domain beam forming is a way to use the signals from multiple omnidirectional microphones to create the equivalent of a direction microphone. Further, since the process is based upon signal processing, it can be variable. It can create the equivalent of an electronically steerable microphone, complete with the ability to “zoom” in or out. It’s not unlike a zoom lens for sound.

Sounds cool, right?

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The xiph.org foundation have just released a 30 minute video that they call A Digital Media Primer For Geeks. This video is a great overview of the basics of digital media. It’s nicely written and very clearly stated.

Given my interest in IP telephony and background in production/broadcasting I find that there’s a lot to like in this introduction. It nicely describes such things as; digital vs analog signals, audio sampling rates and alaw vs ulaw encoding….all good stuff to know. It even includes a few rudimentary examples of audio at different sample rates.

Available in a variety of formats up to 720p HD, I think that this primer is a great offering. It makes clear what might be for some fuzzy concepts in digital media. Highly recommended viewing!

BTW – I get a kick when someone actually says “Google is your friend” in such a presentation. It’s so true, but rarely said without being crude.

Sometimes the simplest questions result in the most interesting path of investigation. So it has been with Soljon’s initial question;

I am looking for an IP phone that supports G.722 and has audio inputs / outputs so I can connect it to my mixer. We are trying to connect two studios together for an online radio station. I have yet to find anything other than high end Polycom gear that has something like RCA in/out jacks. Have you by any chance come across anything?

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