Volume buttons on the remote offer a convenient way to control audio while private listening mode is in use.
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Speaking after a 45 minute meeting in Downing Street, Mr Ford said Tony Blair had been "in close listening mode".
He said that view may rely on a partial account of the meeting, where Mr Cameron was "very much in listening mode".
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In previous work, they demonstrated that phones in idle listening mode expend roughly the same amount of power as they do when they're fully awake.
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This video shows even more: Commanding the headset is as easy as uttering the words "OK, Glass, " a clever use of real-world speech to engage the device's listening mode.
The intuitive new interface makes it easy to find movies and shows quickly while the private listening mode is perfect for late-night streamers who don't want to wake up the family.
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For skeptics who still think this kind of music is a dead-white-male cultural relic, we suggest the very profusion of listening options in repertoire, medium, and listening mode tells us classical is not just very much alive, but a great case study in market evolution.
For late night movie and music enjoyment, a Night Listening Enhancer mode allows dialog and quiet passages to be heard clearly, even at low volumes.
It can even generate an offline playlist on the device -- something similar in spirit to a feature I've long wanted on the iPod and other players, which is to be able to "switch gears" while listening in shuffle mode to play more tracks from just that artist, the rest of the album, or other songs like the one I've heard.
My Beam mode focuses the sound at a specific listening position, so the listener can hear all program audio clearly, including dialog, without disturbing others in the room.
In the Wave mode, the transducers create left and right surround fields to maximize the listening area in larger rooms.
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The researchers have found that this kind of energy-taxing "idle listening" is occurring during a large portion of the time phones spend in power-saving mode---as much as 80 percent on busy networks.
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