1. The working principle of the outdoor unit is as follows:

(1) The microphone is used to collect voice and the camera is used to collect image signals, and the collected analog signals are converted into digital signals. The main processor compresses and enhances the voice and digital image signals, and then transmits the compressed signals through the wireless signal transmitter;

(2) transmitting the control signals generated by peripherals, such as doorbell buttons, through a wireless signal transmitter;

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

(4) The wireless signal receiver receives the control signal transmitted by the indoor unit, and the main processor converts the received control signal into a lock control command, which is transmitted to the unlocking controller through a short-distance wireless transmitter (usually adopting Zigbee protocol).

2. The working principle of the indoor unit is as follows:

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

(2) transmitting control signals generated by various peripherals of the indoor unit, such as buttons for talking and unlocking, through a wireless signal transmitter;

(3) The microphone is used to collect voice signals, and the collected analog signals are converted into digital signals. The main processor compresses the voice signals, and then the compressed signals are transmitted through the wireless signal transmitter.

the unlocking controller is mainly used to realize wireless remote unlocking. The unlocking controller is embedded with various intelligent locks (electric lock, magnetic lock, silent lock, fingerprint lock and password lock, etc.). When the unlocking controller receives the wireless control signal from the outdoor unit, it decrypts and decodes to generate a signal whether to unlock, thus remotely unlocking.

Extended information

Common doorbells include ordinary wireless doorbells, wireless doorbells without batteries and wired doorbells.

1. Wireless doorbell

A wireless doorbell without battery means that the transmitter adopts energy capture technology, which can collect the energy when the user presses the doorbell button and convert it into electric energy to drive the doorbell sounder to ring. Its indoor unit, that is, the doorbell sounder, needs to be connected to the mains. The control signal generated by the doorbell button is transmitted by the wireless signal transmitter, and the wireless signal receiver of the indoor unit receives this wireless signal and rings the bell.

2. Active doorbell

An active wireless doorbell is a doorbell that is often seen in daily life. Its transmitter is powered by a 12V battery, and its receiver is powered by a battery or connected to the mains. The doorbell button emits a wireless signal, and the wireless signal receiver of the indoor unit receives this wireless signal and rings the bell.

wireless doorbell can be divided into wireless non-visual doorbell and wireless visual doorbell according to the transmitted content.

3. Wired doorbell

The transmitter and the receiver are connected by wires, and the signal sent by the transmitter is transmitted to the receiver through wires, so the signal is relatively stable and will not sound by mistake. However, wiring is troublesome, and it is likely to be necessary to cut the wall, so it has gradually faded out of the market in recent years.

Baidu encyclopedia-doorbell

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