BGM

Background Music is Back Ground Music, abbreviated as BGM. Sometimes it is also called the Public Address System, or PA. Its basic function is to store, plaza, hotel, hall, restaurant, residential and other public places provide background music or some necessary information, cover environmental noise, create a relaxed and harmonious atmosphere. In the event of fire and other accidents, emergency broadcast can also be carried out through strong cutting, which is conducive to the full use of equipment and saving investment.

Background music usually use with low level of the plane, without sound field orientation, to let people is not easy to perceive the position of the sound source, do not need the stereo effect, make music and and environment be in harmony are an organic whole, become the "background" music.

The selection of background music requires harmony with the background environment, and different programs should be played according to different occasions and times.

For example, music should be played in the shopping mall with a small dynamic range and a slow rhythm, which makes customers feel relaxed, happy, slow down, arouse the desire to buy and improve the turnover. Music should be played in the restaurant to stimulate the appetite of the guests, more food. Fast food restaurants and shopping supermarkets should play fast music to speed up customers. Used in hospitals to keep patients emotionally stable.

Different music should be played at different times of the day. In the morning, the bright and fresh field park will be played. The night should play easy to fall asleep serenade, lullaby.

Background music broadcast system generally consists of four parts:

Audio source: generally choose CD, cassette holder and receiver

Control part: there are partition, monitor, timer and other intelligent processing equipment.

Amplification: to make use of impedance matching, use constant voltage amplifier, output voltage 70V or 100V.

Output: the input voltage is 70V or 100V. There are suction top, wall hanging sound box, indoor and outdoor sound column, various types of lawn sound box

Selected from liu yu-ming ma huimin. Background research on music broadcasting system. Electroacoustic technology, 1996, 11