AV-Receiver

AV receiver (also A / V receiver ) are multi-channel hi-fi amplifier, the different audio and video sources can switch to their analog and digital outputs. To the outputs of an AV receiver TV sets, video projectors or even additional amplifier stages are as speakers connected. The inputs on an AV receiver allow you to connect many different audio and video equipment, such as players for CDs, DVDs or Blu-ray discs, video and digital cameras and storage media on which audio and video files are stored.

Some AV receivers have a network connection, via the additional multimedia files from the local network or the Internet can be reproduced.

AV receiver equipped with multi-channel amplifier with at least 5 sound and a subwoofer channel (5.1 ) up to models with 11 clay and 2 subwoofer channels ( 11.2). You are able to decode various surround sound audio formats and converting them into surround sound.

In addition, some models have on image processors, which processes the input video signals and for high-resolution output devices ( FullHD) can be processed. AV receivers because of their versatility and the ability to implement surround sound, a key component for home theaters.

Audio and video switcher

AV receiver serve as a control center in the home theater and connect the different devices together so that both for listening to audio sources ( eg radio, CD, tape recorders, record players and portable audio devices ) as well as for watching video sources (eg. of video recorders or Blu -ray disc players ) no different amplifier and speaker sets are needed. Thus, for example, be connected to a single cable to the AV receiver and optionally ( eg VHS or DVD recorders, Blu -ray Disc player) to display the image of various input devices, an integrated in the home theater video projector, while the connected speakers to play back its audio.

For the implementation of these tasks, an AV receiver is equipped with interfaces of different number and different formats (such as HDMI, S-Video, Toslink ) for each of its inputs and outputs. The more numerous the connections offered and supported formats, the more versatile the AV receiver can be used.

Multi-channel sound decoder

A built-in Dolby decoder, a matrix -encoded stereo sound can again be transformed into a 5.1 signal (Dolby Pro Logic II and IIx ); often those sounds are encoded space in video signals namely, instead of a pure stereo sound transports, which then can be converted into sound information on all six audio outputs, for example, despite playing a video with only two audio channels.

Today's models can continuously decode different variations of digital sound formats, which (TOSLINK) can be played back via a RCA cable (S / PDIF) or an optical waveguide.

Blu -ray discs, DVD-Audio and SACD discs often also include, in particular high-quality digital sound formats (eg DTS HD Master Audio, Dolby TrueHD, DSD), which must be leaked to the AV receiver via its HDMI inputs, because only HDMI interfaces can transfer the necessary high data rates from the player to the AV receiver.

Construction of the amplifier part

An AV receiver is usually designed as integrated amplifier, so has both preamplifiers for each audio output channel, and the corresponding power amplifier. While most satellite speakers are connected directly to the output stages of the AV receiver, the supply of one or more active subwoofer takes place ( with integrated power amplifier ) via one or more own preamp outputs which are separately provided for this purpose. Passive subwoofers are generally supplied on the speaker terminals of the amplifier.

Radio Tuner

The fact that a radio receiver in the device is present, mainly has the reason that such a production cost of an audio amplifier is increased only insignificantly, whereas a separate FM tuner as hi-fi component with its own housing fails with a minimum of about 50 euros. DAB tuners are rare, since this distribution channel is not generally established, well-equipped models have, however, often about the possibility of Internet radio reception.

Differences between current models

The various AV receiver models differ with respect to

  • Number and variety of inputs and outputs,
  • Number of supported media formats,
  • Equipment for surround sound enhancement,
  • Power outputs (music performance, better power rating ),
  • Number of supported speakers and subwoofer channels (from 01.05 to 02.11 or even more )
  • Capabilities for image processing and enhancement (eg deinterlacer )
  • Capabilities for image scaling (Video Scaler )
  • Built-in network connection and internet capability,
  • Possibility of connecting storage devices ( eg hard disks, USB sticks, memory cards )
  • Radio reception
  • Network capability (DLNA )
  • Automatic adjustment of the delay between each speaker setup microphone means ( instead of manual specification of the speaker distances from the listening position)

The price range for the various configurations and range in size from just 100 Euros to several thousand Euros for top models in the consumer sector. Exotic high-end devices can also cost tens of thousands of euros.

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