As a lover of radio, are you very curious about how radio works? In fact, the working principle of the radio is that the high-frequency signal received by the antenna is sent to the frequency conversion tube together with the local oscillation frequency of the radio through the input circuit (its frequency is a fixed intermediate frequency higher than the foreign high-frequency signal, and the intermediate frequency standard in China is 465khz), and a new frequency is generated in the load circuit (frequency selection) of the frequency conversion level, that is, the intermediate frequency generated by the differential frequency, the intermediate frequency only changes the frequency of the carrier, the original audio envelope has not changed, the intermediate frequency signal can be better amplified, and the intermediate frequency signal is detected and filtered out of the high-frequency signal。 After low playing, the power is amplified, and the speaker is pushed to produce sound.
The detailed steps for the radio to work are as follows:
1.Received signal: The antenna receives the radio signal and then transmits it to the tuning circuit.
2.Select Signal: The tuning circuit selects and filters out the desired radio signal based on the channel selected by the user. This process is usually achieved through the use of inductance coils and capacitors.
3.Convert to audio signal: The geophone converts the radio signal received by the tuning circuit into an audio signal. This is achieved by removing the high-frequency part of the radio signal and leaving only the audio part.
4.Amplify the audio signal: The audio signal is amplified by an amplifier so that the sound is loud enough to be heard by the human ear.
5.Output Sound: The amplified audio signal drives the speaker to produce sound.
The above information is for reference only, it is recommended to consult the relevant books on the working principle of the radio or consult professional technicians.
Demo environment. Hardware Model: None.
Software Version: None.
App version: None.