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Tips for designing public broadcasts :
(1) Transmission mode: The system's output power feeding method adopts cable broadcast transmission mode.
(2) Line loss requirements: In public broadcasting systems, the attenuation of the line from the output of the power amplifier equipment to the farthest user speaker on the line should meet the following requirements:
· Business broadcasting should not exceed 2dB (at 1kHz)
· Service broadcasts should not be greater than 1 dB (at 1 kHz)
(3) Feed line with constant voltage output, output voltage is 70V or 100V.
(4) Capacity calculation method of power amplifier:
Calculation method for operational broadcast system and operational broadcast system: P=K1×K2×ΣPo
Where: P--power amplifier output total electric power (W);
Po--Ki×Pi, the maximum electric power (W) at the same time when each branch is broadcast;
Pi - the user equipment rating of the i-th split;
Ki - the coefficient of the ith branch needs at the same time;
For service broadcasting, the room program uses 0.2-0.4 for each set of Ki;
Background music program Ki takes 0.7-0.8
K1-line loss compensation factor: 1.26 when the line loss is 1dB; 1.58 when the line loss is 2dB;
K2-- aging coefficient, generally take 1.2-1.4;
· Calculation method for fire accident broadcasting system: The system calculation method has the following two methods:
a. Power amplifier capacity is determined by 1.3 times the total number of speakers in the system.
b. The power amplifier capacity is determined by 1.5 times the total number of the largest 3-layer loudspeakers in the system.
<br> <br> standby power amplifier public broadcasting system (5) should be set to back up the power amplifier PA, a power amplifier can be used to automatically or manually during operation of the power amplifier failure. Power amplifiers used for important broadcasts, such as power amplifiers for fire accident broadcasts, should have standby power amplifiers that can be used immediately when the operational amplifier fails. The number of spare power amplifiers should be determined based on the capacity of the important broadcast payload.
(6) Setting up the speaker • Set up a 3W speaker box in the office, living room, changing room, etc.
· Floor-mounted hallways generally use ceiling-mounted speakers. The distance between the speakers is about 2.5 times the floor height (ceiling height). Use 3-5W ceiling speaker.
• 3-6W speaker boxes should be installed in halls, general meeting rooms, restaurants, shopping malls, and entertainment venues.
· The 1W-2W speaker is used for the bedside control cabinet in the room.
· In the case of architectural decoration and room net height, sound column or combination speaker should be used for large space.
• Horn loudspeakers should be used when setting up speakers in high-noise, damp locations. The horn loudspeakers selected for use in high noise locations should have a sound pressure level 10-15 dB greater than the ambient noise.
(7) Power supply requirements of the broadcasting system • The broadcasting station with small capacity can be directly powered by the outlet; when the capacity is above 500W, the broadcasting control room is set, and the power supply can be powered by the nearest dedicated power controller.
• The AC voltage offset should not be greater than +10% in general. When the voltage offset does not meet the equipment's limit, an automatic voltage regulator should be installed near the equipment.
• The AC power supply capacity for broadcasting is generally 1.5-2 times the AC power consumption of the final broadcasting equipment.
Fire alarm equipment uses fire power.
(8) The choice of transmission cable · Room service broadcast lines should use copper core multi-core cable or copper plastic stranded wire.
• Copper-core plastic twisted wires are preferred for other broadcast circuits.
• Various program signal lines should be shielded.
• Flame-retardant copper core cables or fire-resistant copper core wire and cable should be used for fire accident broadcast lines.
(9) Laying method of the line • The line shall be laid with steel pipe or trunking, and shall not be laid with the same slot as the lighting and power lines.
Fire protection measures should be taken for fire accident radio lines.
Click to view the company's main products: public broadcasting, radio amplifier , broadcasting equipment, lawn speaker, lawn speaker
(1) Transmission mode: The system's output power feeding method adopts cable broadcast transmission mode.
(2) Line loss requirements: In public broadcasting systems, the attenuation of the line from the output of the power amplifier equipment to the farthest user speaker on the line should meet the following requirements:
· Business broadcasting should not exceed 2dB (at 1kHz)
· Service broadcasts should not be greater than 1 dB (at 1 kHz)
(3) Feed line with constant voltage output, output voltage is 70V or 100V.
(4) Capacity calculation method of power amplifier:
Calculation method for operational broadcast system and operational broadcast system: P=K1×K2×ΣPo
Where: P--power amplifier output total electric power (W);
Po--Ki×Pi, the maximum electric power (W) at the same time when each branch is broadcast;
Pi - the user equipment rating of the i-th split;
Ki - the coefficient of the ith branch needs at the same time;
For service broadcasting, the room program uses 0.2-0.4 for each set of Ki;
Background music program Ki takes 0.7-0.8
K1-line loss compensation factor: 1.26 when the line loss is 1dB; 1.58 when the line loss is 2dB;
K2-- aging coefficient, generally take 1.2-1.4;
· Calculation method for fire accident broadcasting system: The system calculation method has the following two methods:
a. Power amplifier capacity is determined by 1.3 times the total number of speakers in the system.
b. The power amplifier capacity is determined by 1.5 times the total number of the largest 3-layer loudspeakers in the system.
<br> <br> standby power amplifier public broadcasting system (5) should be set to back up the power amplifier PA, a power amplifier can be used to automatically or manually during operation of the power amplifier failure. Power amplifiers used for important broadcasts, such as power amplifiers for fire accident broadcasts, should have standby power amplifiers that can be used immediately when the operational amplifier fails. The number of spare power amplifiers should be determined based on the capacity of the important broadcast payload.
(6) Setting up the speaker • Set up a 3W speaker box in the office, living room, changing room, etc.
· Floor-mounted hallways generally use ceiling-mounted speakers. The distance between the speakers is about 2.5 times the floor height (ceiling height). Use 3-5W ceiling speaker.
• 3-6W speaker boxes should be installed in halls, general meeting rooms, restaurants, shopping malls, and entertainment venues.
· The 1W-2W speaker is used for the bedside control cabinet in the room.
· In the case of architectural decoration and room net height, sound column or combination speaker should be used for large space.
• Horn loudspeakers should be used when setting up speakers in high-noise, damp locations. The horn loudspeakers selected for use in high noise locations should have a sound pressure level 10-15 dB greater than the ambient noise.
(7) Power supply requirements of the broadcasting system • The broadcasting station with small capacity can be directly powered by the outlet; when the capacity is above 500W, the broadcasting control room is set, and the power supply can be powered by the nearest dedicated power controller.
• The AC voltage offset should not be greater than +10% in general. When the voltage offset does not meet the equipment's limit, an automatic voltage regulator should be installed near the equipment.
• The AC power supply capacity for broadcasting is generally 1.5-2 times the AC power consumption of the final broadcasting equipment.
Fire alarm equipment uses fire power.
(8) The choice of transmission cable · Room service broadcast lines should use copper core multi-core cable or copper plastic stranded wire.
• Copper-core plastic twisted wires are preferred for other broadcast circuits.
• Various program signal lines should be shielded.
• Flame-retardant copper core cables or fire-resistant copper core wire and cable should be used for fire accident broadcast lines.
(9) Laying method of the line • The line shall be laid with steel pipe or trunking, and shall not be laid with the same slot as the lighting and power lines.
Fire protection measures should be taken for fire accident radio lines.
Click to view the company's main products: public broadcasting, radio amplifier , broadcasting equipment, lawn speaker, lawn speaker
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NINGBO JIMING ELECTRIC APPLIANCE CO., LTD. , https://www.feituosafety.com