CCTV surveillance system has been one of the most important electronic security systems. It is commonly used to protect personal safety and reduce the risk of stolen properties. What it needs is merely a camera for sending signals to monitor and saving the images in the storage device. CCTV surveillance is commonly used in the financial and commercial institutions, as well as daily access to the shops and buildings such as banks, convenience stores, residential buildings etc.
Access control system is an electronic system that is designed to control door locks by door controller. Access Control System recognizes authenticates and authorizes entry of a person to enter the premise thereby giving complete protection ensuring security with the system.
Communal Aerial Broadcast Distribution system is system installed inside a building to receive free-to-air TV/FM signals transmitted via radio frequencies and distribute them to the audience.
Public address system is widely used on many occasions like shopping mall, train station, amusement parks, hotel, etc. It mainly uses for playing announcement or background music. The traditional consists power amplifier, mixer and speaker. Nowadays PA system is digitalized. Speaks can be controlled through a TCP/IP network by using central control software. The speaker zones can be divided easily so that it is very flexible for users.
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