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Typically, a call is caused by the person's movement changing the shape of the pocket in a person's clothing in such a way that a small amount of pressure is applied to some of the buttons, or in the case of a touch screen phone, a call can also be caused by the screen of the phone facing the person's body and a small amount of perspiration ...
Listening devices of the East German security services A microphone disguised as a power outlet plate. A covert listening device, more commonly known as a bug or a wire, is usually a combination of a miniature radio transmitter with a microphone.
For this reason, so-called comfort noise needs to be generated to compensate for the lack of background noise. The ingress end must therefore signal the egress end that silence suppression is in effect. For best results, the level of comfort noise being generated on egress should match that of the background noise at the ingress end.
Some central office switches in the United States, notably older GTD-5 EAX systems, utilize a single frequency tone, 480 Hz, known as High Tone for this purpose. In either case, the tone is substantially louder than any other signal transmitted over a copper POTS circuit; loud enough to be heard across a room from an unused off-hook telephone.
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the speech may sound "choppy" (see noise gate) and difficult to understand; the sudden change in sound level can be jarring to the listener. To counteract these effects, comfort noise is added, usually on the receiving end in wireless or VoIP systems, to fill in the silent portions of transmissions with artificial noise.
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The iPhone Stereo Headset was introduced in 2007 and was bundled with the original iPhone and iPhone 3G, and featured a control capsule in-line with the left earbud's wire with a microphone and a single button, actuated by squeezing the unit, which can be programmed to control calls, presentations, music and video playback, launch Siri, or take ...