Design of background music system for the hottest

2022-08-05
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Tourism hotel background music system design

Abstract: tourism hotel background music system design, a typical background music system is composed of sound source, matrix management center, power amplifier, loudspeaker, etc. The configuration of the system shall start from the actual needs. Generally, two sets of CD players, one set of FM receiver, one set of circular playback cassette recorder, one or two sets of call (meeting the business broadcast) and automatic broadcast device for fire emergency broadcast are selected

key words: background music matrix management center power amplifier speaker Untitled Document related standards on background music

1.1 tourism hotel star standard provisions

in 2003, China issued and implemented the national standard GB/T classification and evaluation of tourism hotel stars. The star classification is:

one star: at least 15 rooms (sets) available for rent

two star: at least 20 rooms (sets) available for rent

three star: at least 30 rooms (sets) available for rent

four star: at least 40 rooms (sets) available for rent

five star: at least 40 rooms (sets) available for rent

platinum five-star

generally, it is required to have a stable and reliable public performance audio relay system, background music tracks, appropriate volume and good sound quality; Guest rooms are required to have sound devices with good sound quality that can be controlled by guests

1.2 relevant provisions of jgj/t code for electrical design of civil buildings

(1) Chapter 21 cable broadcasting requires that hotels and large public activity places should set up service broadcasting to meet the requirements of music appreciation. The hotel should not have more than five service radio programs

(2) in Chapter 24 fire alarm and fire fighting linkage control, it is required that the capacity of fire accident broadcast amplifier should be determined as 1.3 times of the total capacity of speakers

1.3 relevant provisions of 5.4 fire emergency broadcast in GB code for design of automatic fire alarm system

(1) loudspeakers in civil buildings shall be set in corridors, halls and other public places. The rated power of each loudspeaker shall not be less than 3W, and its quantity shall ensure that the distance from any part of a fire compartment to the nearest loudspeaker is not more than 25m. The distance from the last loudspeaker in the walkway to the end of the walkway shall not be greater than 12.5m

(2) for loudspeakers set in places where the ambient noise is greater than 60dB, the playing sound pressure level at the farthest point within the playing range shall be 15dB higher than the background noise

(3) when special loudspeakers are set in guest rooms, their power should not be less than 1.0W

(4) when the fire emergency broadcast is shared with the public address, the following requirements shall be met:

◆ in case of fire, the loudspeaker and public address loudspeaker on the fire evacuation floor shall be able to be forcibly switched to the fire emergency broadcast state in the fire control room

◆ the fire control room shall be able to monitor the working state of the loudspeaker used for fire emergency broadcasting, and shall have the functions of remotely starting the loudspeaker and broadcasting with microphone

it can effectively meet the impact resistance test requirements of explosion-proof equipment (5) when the bedside control cabinet is equipped with service music broadcasting speakers, it shall have the fire emergency broadcasting function

(6) a standby loudspeaker for fire emergency broadcast shall be set, and its capacity shall not be less than 1.5 times of the total maximum capacity of the fire emergency broadcast loudspeaker within the range of simultaneous broadcasting in case of fire

functional zones and fire zones

the functional zones of tourist hotels generally include the lobby, guest rooms, restaurants, bar rooms, kitchens, various meeting rooms, recreational facilities, management centers, and public areas (parking lots, public toilets, shopping malls, business centers, corridors, etc.). The setting of background music speakers and volume regulators shall be considered according to functional zones and fire zones to meet the requirements of business broadcasting, service broadcasting and fire emergency broadcasting. The background music speakers in the corridors on the guest room floor are divided according to the fire compartment. Type selection of sound reinforcement equipment

type selection of sound reinforcement equipment is an important part of system design. It not only determines the design conditions, but also affects the system performance

3.1 sound source

the sound source is composed of CD player, FM receiver and cassette recorder. CD player is the most widely used carrier for recording audio information in digital mode; The cassette recorder shall have the functions of continuous playback and circular playback. If recording is required, the cassette recorder with more functions and higher grades shall be selected. The configuration of the number of sound sources shall be determined according to the demand. Generally, four sets are set in the guest room, one of which is used as an emergency broadcast in case of fire

3.2 the audio digital matrix management center

matrix generally has 4-in-4-out, 16 person 16 out, 16 person 32 out, 16 person 64 out and other combined tension and compression coil spring fatigue testing methods

main functions: provide various sound source interfaces for the system, distribute them to each amplifier, and monitor peripheral equipment; Playback priority can be set and output can be controlled in different regions; Signal processing and tone control can improve language clarity; Automatic volume control can automatically adjust the output volume in places with fluctuating ambient noise

3.3 power amplifier

power amplifier is an important equipment with high technical requirements in the system. Because the power amplifier is different from the preamplifier, it works at high voltage and high current, so the failure rate is high; When the power amplifier output is interconnected with the loaded loudspeaker system, there are certain requirements for impedance, frequency conversion and balance

main technical indicators of power amplifier: output power, sensitivity, frequency response, etc

in the background music system, the power amplifier mostly adopts the constant voltage output mode, and the output voltage adopts 70V or 100V. The power amplifier is calculated as follows:

p=ki × K2 × Σ po

where:

p -- total electric power output by power amplifier (W)

Po——Ki × PI broadcast the maximum electric power at the same time for each branch

pi refers to the rated capacity of user equipment of branch I; Ki refers to the simultaneous demand coefficient of the ith branch. In case of service broadcasting, the Ki of each set of guest room program is 0.2-0.4; The background music system ki is taken as 0.5 ~ 0.6; In case of business broadcasting, Ki is taken as 0.7 ~ 0.8; In case of fire accident broadcast, Ki is taken as 1.0

k1 - line attenuation compensation coefficient; Take 1.26 when the line attenuation is IDB; Take 1.58 when the line attenuation is 2dB

k2 - aging coefficient, generally 1.2-1.4

3.4 loudspeakers

loudspeakers are transducers that convert electrical energy into sound waves and are the last link in the sound reinforcement system

main technical indicators of loudspeaker: output power, sensitivity, etc. The definition of sensitivity is: when the signal voltage of 1W power is injected into the loudspeaker, the risk is raised at a distance: 1) the process of interest rate hike in the United States is accelerated; 2) Sluggish domestic demand; 3) Supply to change the position 1m lower than the expected sounder

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