What is the working principle of wireless doorbell?

December 01, 2022

The wireless doorbell is usually composed of an indoor unit, an outdoor unit, and a door lock controller. These three parts together have the functions of intercom, monitoring, photographing and unlocking. How are these functions implemented? Let us introduce the working principle of the wireless doorbell.

Wireless doorbell working principle

Indoor unit working principle:

1) The wireless signal receiver receives wireless voice or video signals from the outdoor unit, and the main processor processes the received signals such as redundancy and decoding, and then displays the decoded video signals through the display screen, and the decoded voice signals are D/A is converted into analog signal and played through the speaker;

2) The control signal generated by the various peripherals of the indoor unit such as the call, unlock, etc., is transmitted through the wireless signal transmitter;

3) Acquire a speech signal by using a microphone, and convert the collected analog signal to a digital signal. The main processor compresses the speech signal, and then transmits the compressed signal through the wireless signal transmitter.

Outdoor unit working principle:

1) Use a microphone to collect voice and camera to capture image signals, and analog signals are converted to digital signals. The main processor compresses and enhances voice and digital image signals, and then transmits the compressed signal through the wireless signal transmitter.

2) The control signal generated by a peripheral device such as a doorbell button is transmitted through a wireless signal transmitter;

3) The wireless signal receiver receives the wireless voice signal transmitted from the indoor unit, the main processor decompresses the received voice signal, and then converts the analog signal into an analog signal and plays it out through the speaker;

4) The wireless signal receiver receives the control signal transmitted from the indoor unit, and the main processor converts the received control signal into a lock control command and transmits it to the unlock controller through a short-range wireless transmitter (usually a Zigbee protocol).

Understanding the working principle of the wireless doorbell can help us to use it better. When the wireless doorbell is out of order, we can also check the cause of the fault on the basis of these principles. If we can not solve it, we can look for professionals to come and repair.