In the selection of equipment need to pay attention to matters Public broadcasting system for the general sound system is a different architectural model, so in the selection of broadcast system equipment, but also need to pay attention to the selected matters, the following is a reference experience 1, power amplification equipment <br> Power amplification equipment is the most important thrust in the entire public broadcasting cabinet. They are responsible for amplifying the audio signal output after the integration of the sound source input equipment and adding it into the carrier, and then become a sound signal output with a carrier wave, so they are choosing to use The following items to be noted on the equipment are: "Whether the power amplifier itself has good heat dissipation" because it will generate high temperature when the signal is amplified and added to the carrier wave. If the heat dissipation condition is not good enough, it cannot be used for a long time; most people often go for convenience. Selectable resettable breakers, but this type of protection device works on the basis of the temperature generated by the passage of current, as a benchmark.
2, audio output device <br> <br> for the broadcast part of the equipment the public address system and sound system in general is very different, thing to note is that auto-play feature, because most of the public broadcasting system The operation is not handled by a dedicated person, so a "main power switch" is set in the system to facilitate the operation of the personnel, and most of the systems also have a timed start-up. The sound source input device is the most difficult device in the public address system. Because general audio input devices are equipped with sound quality adjustment functions, in addition to integrating all audio input signals, it is also responsible for modifying the integrated output signals, and the public broadcasting system seeks to increase the transmission distance of the sound signals. In response to the large number of broadcast horn systems, the low-impedance outputs of 0, 4 Ω, 8 Ω, and 16 Ω cannot be used for general audio systems. Therefore, high-impedance outputs of 0, 70 V, and 100 V with carrier waves were adopted.
3, operation and control equipment
Operation and control equipment is the most complex part of the entire public address system and can be divided into input control and output control. Input control: mainly includes two items of system startup and shutdown control and audio source input option control. These two items can be externally controlled input signals. If the external controller output start signal is a power signal, please convert it to a no-voltage short-circuit signal when you can not confirm When you input and output signals to your equipment, please test it with a three-meter before connecting to avoid damage due to signal conflict.
Output control: The output control in the public broadcasting system is mainly to control the opening and closing of the required broadcasting area horn. This part has been changed to digital transmission control, so it must be noted that the control unit of the digital transmission control signal can load the decoding control box. The number and transmission distance, as well as the specifications of the required transmission wire.
4, <br> <br> speaker sound output device selection the main consideration is the location of different materials and have different types of horn sound characteristics, how to match the sound quality and volume to produce the desired scene, then a test of the designer Experience and wisdom.
Since the public address system uses carrier sound signals, an intermediate transformer must be installed for each speaker. Do not use multiple speakers to share an intermediate transformer in order to save costs or facilitate construction.
2, audio output device <br> <br> for the broadcast part of the equipment the public address system and sound system in general is very different, thing to note is that auto-play feature, because most of the public broadcasting system The operation is not handled by a dedicated person, so a "main power switch" is set in the system to facilitate the operation of the personnel, and most of the systems also have a timed start-up. The sound source input device is the most difficult device in the public address system. Because general audio input devices are equipped with sound quality adjustment functions, in addition to integrating all audio input signals, it is also responsible for modifying the integrated output signals, and the public broadcasting system seeks to increase the transmission distance of the sound signals. In response to the large number of broadcast horn systems, the low-impedance outputs of 0, 4 Ω, 8 Ω, and 16 Ω cannot be used for general audio systems. Therefore, high-impedance outputs of 0, 70 V, and 100 V with carrier waves were adopted.
3, operation and control equipment
Operation and control equipment is the most complex part of the entire public address system and can be divided into input control and output control. Input control: mainly includes two items of system startup and shutdown control and audio source input option control. These two items can be externally controlled input signals. If the external controller output start signal is a power signal, please convert it to a no-voltage short-circuit signal when you can not confirm When you input and output signals to your equipment, please test it with a three-meter before connecting to avoid damage due to signal conflict.
Output control: The output control in the public broadcasting system is mainly to control the opening and closing of the required broadcasting area horn. This part has been changed to digital transmission control, so it must be noted that the control unit of the digital transmission control signal can load the decoding control box. The number and transmission distance, as well as the specifications of the required transmission wire.
4, <br> <br> speaker sound output device selection the main consideration is the location of different materials and have different types of horn sound characteristics, how to match the sound quality and volume to produce the desired scene, then a test of the designer Experience and wisdom.
Since the public address system uses carrier sound signals, an intermediate transformer must be installed for each speaker. Do not use multiple speakers to share an intermediate transformer in order to save costs or facilitate construction.
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