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Radio is a small radio receiver, also known as radio and broadcast. It is composed of mechanical devices, electronic devices, magnets, etc. It is mainly used to receive radio programs and listen to Radio transmitter.

The advent of DSP technology radio marks the gradual withdrawal of traditional analog radio from the stage of history, and the digital era of radio has arrived.

Construction principle:

A radio is composed of mechanical devices, electronic devices, magnets, etc. It uses electrical energy to convert radio wave signals and can listen to audio signals emitted by radio stations. kind of machine. Also known as radio, broadcast, etc. The advent of DSP technology radio marks that traditional analog radio will gradually withdraw from the stage of history, and the digital era of radio has arrived.

It is to convert the high-frequency signal received from the antenna into an audio signal through detection (demodulation), and send it to the earphones or speakers to become sound waves.

Due to technological advancement, there are many radio waves of different frequencies in the sky. If all these radio waves are received, the audio signal will be like being in a busy city, with many sounds mixed together, resulting in nothing being heard clearly.

In order to try to select the required program, there is a selective circuit behind the receiving antenna. Its function is to select the required signals (stations) and "filter out" the unwanted signals. , to avoid interference. This is the "Channel Select" button we use when listening to the radio.

The output of the selective circuit is to select the high-frequency AM signal of a certain radio station. It is not possible to use it to directly drive the earphones (electroacoustic device). It must be restored to the original audio signal. This This kind of restoration circuit is called demodulation. If the demodulated audio signal is sent to the earphones, the broadcast can be received.