Receivers

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A radio receiver is an electronic circuit that receives its input from an antenna, uses electronic filters to separate a wanted radio signal from all other signals picked up by this antenna, amplifies it to a level suitable for further processing, and finally converts through demodulation and decoding the signal into a form usable for the consumer, such as sound, pictures, digital data, measurement values, navigational positions, etc.

In consumer electronics, the terms radio and radio receiver are often used specifically for receivers designed for the sound signals transmitted by radio broadcasting services – historically the first mass-market radio application.

Types of radio receivers

Various types of radio receivers may include:

Consumer audio and high fidelity audio receivers and AV receivers used by home stereo listeners and audio and home theatre system enthusiasts.;

Communications receivers, used as a component of a radio communication link, characterized by high stability and reliability of performance.;

Simple crystal radio receivers (also known as a crystal set) which operate using the power received from radio waves.;

Satellite television receivers, used to receive television programming from communication satellites in geosynchronous orbit.;

Specialized-use receivers such as telemetry receivers that allow the remote measurement and reporting of information.;

Measuring receivers, laboratory grade devices also known as "measurement receivers", used to perform traceable calibration of RF attenuators and RF signal generators.;

Consumer audio receivers

In the context of home audio systems, the term "receiver" often refers to a combination of a tuner, a preamplifier, and a power amplifier all on the same chassis. Audiophiles will refer to such a device as an integrated receiver, while a single chassis that implements only one of the three component functions is called a discrete component. Some audio purists still prefer three discreet units - tuner, preamplifier and power amplifier - but the integrated receiver has, for some years, been the mainstream choice for music listening. The first integrated stereo receiver was made by the Harman Kardon company, and came onto the market in 1958. It had undistinguished performance, but it represented a breakthrough to the "all in one" concept of a receiver, and rapidly improving designs gradually made the receiver the mainstay of the marketplace. Many radio receivers also include a loudspeaker.

Read more at Wikipedia.org