What is the working principle of wireless doorbell?

A wireless doorbell is typically made up of three main components: the indoor unit, the outdoor unit, and the door lock controller. These elements work together to provide a range of functions, including intercom, video monitoring, photo capture, and remote unlocking. But how exactly do these features come together? Let’s take a closer look at the working principle of a wireless doorbell.

How Does a Wireless Doorbell Work?

Indoor Unit Functionality:

1) The indoor unit's receiver picks up wireless voice or video signals from the outdoor unit. These signals are processed by the main processor, which decodes and removes any redundancy. The decoded video is then displayed on the screen, while the audio is converted from digital to analog through D/A conversion and played through the speaker.

2) When you press buttons like “call” or “unlock,” the indoor unit sends control signals via its wireless transmitter.

3) The microphone in the indoor unit captures your voice, converts it into a digital signal, and the main processor compresses it before sending it over the wireless connection.

Outdoor Unit Functionality:

1) The outdoor unit uses a microphone to record sound and a camera to capture video. These analog signals are converted into digital format, then compressed and enhanced by the main processor before being sent wirelessly.

2) When someone presses the doorbell button, the control signal is transmitted back to the indoor unit through the same wireless channel.

3) The outdoor unit also receives voice signals from the indoor unit. These are decompressed and converted back to analog for playback through the speaker.

4) Additionally, when the indoor unit sends an unlock command, the outdoor unit’s receiver processes this signal, converts it into a lock control instruction, and sends it to the door lock controller using short-range wireless technology, often based on Zigbee protocols.

Understanding the inner workings of a wireless doorbell can help users better utilize its features. If something goes wrong, knowing the basic principles can assist in identifying the issue. If the problem persists, it’s always best to contact a professional for assistance.

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