What is a walkie-talkie and how does a walkie-talkie work?

A walkie-talkie is a portable wireless communication device, also known as a wireless walkie-talkie or intercom. It can carry out two-way real-time communication within a certain range without complicated operations such as dialing, and is very suitable for occasions that require frequent communication, such as construction sites, outdoor expeditions, commercial places, etc.

The working principle of the intercom is as follows:

1. Voice input: The user inputs voice signals through the microphone on the intercom. The microphone converts the sound into electrical signals.

2. Signal processing: The signal processor inside the walkie-talkie will process the input voice signal and convert it into a signal format suitable for wireless transmission.

3. Signal transmission: The processed signals are transmitted to the receiver via radio frequencies. These signals can be analog or digital, depending on the type of walkie-talkie.

4. Reception and decoding: After the receiving intercom receives the transmitted signal, it decodes and processes the signal and converts it into an audible voice signal.

5. Speaker output: The decoded voice signal is output through the speaker of the intercom, so that the receiver can hear the sender's voice.

The working principle of walkie-talkies is similar to a simplified wireless telephone system, but unlike mobile phone communications, walkie-talkies are a point-to-point or one-to-many communication method, where users can directly conduct real-time two-way conversations without having to perform operations such as dialing.

In general, walkie-talkies realize voice communication between users through radio signals. Their simple and convenient working principle makes them widely used in many occasions.