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A2DP ( Advanced Audio Distribution Profile)This profile defines how high quality audio (stereo or mono) can be streamed from one device to another over a Bluetooth connection. For example, music streamed from a mobile phone to a wireless headset. The two devices must use the same Bluetooth technology.Active filter Air CleanType of electronic filter for vacuum cleaners which sucks away odours.Active loudspeakerA type of speaker that carries its own, built-in power amplification, and so doesn't need to be driven by an external amplifier.ADC (Analogue to Digital Convertor)Electronic device that converts analogue signals into digital signals. Used extensively in the digital TV world. ADSL (Asymmetric Digital Subscriber Line) The system that enables you to get a broadband internet connection over a phone line. The 'Asymmetric' part of its name comes from the fact that while ADSL supports data speeds of more than 7Mbps downstream (to the user), it only supports slower speeds going the other way (up to the Internet).AmplifierElectronic device that increases the voltage, current, or power of a signal. Amplifiers are used in wireless communications and broadcasting, and in all kinds of audio equipment. AnalogueIn telecommunications, an analogue signal is one in which a base carrier's alternating current frequency is modified in some way, such as by amplifying the strength of the signal or varying the frequency, in order to add extra information. Broadcast and telephone transmissions have conventionally used analogue technology. In the AV world, the VHS video cassette is an analogue medium, whereas DVD is a digital medium.Aqua-stopSystem which stops water entering a washing machine when it's not running.Audio/Video Remote Control Profile (AVRCP)Profile designed to provide a standard interface for controlling TVs, Hi-fi equipment, etc. This makes it possible for you to control every component in your system via a single, 'universal' remote control.AVAbbreviation for audio/video that's frequently used as a generic term for audio and video components and home cinema functionality. As in 'that's an AV amplifier', or 'this TV's AV talents are prodigious'.AV receiversThese key components of a home theatre system are primarily designed to amplify sound from multiple audio sources, like a DVD player or Sky receiver. But they can also work as video switching devices, routing video signals through to your TV from a variety of different sources. The advantages of this routing approach are that when you choose, say, the DVD input on your AV receiver, the correct picture and sound immediately appear together on your screen. If you don't connect your video through your AV receiver, you'll have to first choose the right video input on your TV for pictures, and then choose the right audio input on the AV receiver for sound.
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