Wired Headsets: A Tutorial on Connectors, Cables & Pinouts

Headset DevicesPrior to smart phones life was much simpler…at least with respect to the wiring for headsets used with portable music players vs cell phones. A recent project has me dealing with some wired headsets. I thought it worth sharing some of the things that I’ve noted along the way, along with just a bit of the history.

What I’m describing relates to the various ways in which the common headset connector has been used over time and across a number of application contexts, including:

  • Music players
  • Desk phones
  • Smart phones
  • Computers

In the beginning there was the pocket transistor radio. When Sony got around to it some transistor radios featured a 3.5mm (1/8”) 2-conductor jack. This was intended to receive an earphone for private listening. It was also called a “mini-jack” since stereo headphones for listening to music used the full-sized, 1/4”  phone plug.

It’s unclear if the creation of the earphone feature was motivated by the desire to listen to the radio after bedtime, or avoid aggravating the Mrs with the play-by-play of the baseball game.

…time passes, until…
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Blue Jeans Network: H.323 & Skype Video Conferencing

A couple of weeks ago I started to play with a new service called Blue Jeans Network. This startup offers a cloud-based video conferencing service, effectively a cloud-based MCU. The service is presently free as it’s in a limited beta program. The beta program, originally set to expire this month, was just extended until June 15th.

At present their service supports connectivity via H.323, Skype and the PSTN. Of course,the PSTN dial-up means voice conferencing only…and thus only G.711. Clients connected via Skype get VGA resolution video and nice SILK-encoded audio.

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LifeSize Passport Now Supports Video Calling Skype Users

LifeSize-Passport-300In a most interesting press release LifeSize has announced support for video calling to/from Skype user from the LifeSize Passport end-point. The new capability is projected for release in the coming v4.8 software. It will be interesting it give this a try.

It happens that I have a Passport in my home office at the moment. It was acquired earlier this year in the process of my failed attempt to entice LifeSize to join a VUC call using their video conference bridge. In my office the Passport is connected to a Sony 26” Bravia HDTV via HDMI. The camera connects to the Passport device via a Firewire cable.

The Passport is a small device. It’s small enough to be portable. I’m told that some people carry it around as they travel, using it over hotel broadband. The camera includes a built-in microphone array. The video quality presented is quite good, especially in light of the rather modest cost of the device.

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