The composition of the conference sound system
1. Digital conference room sound system system (speaking, voting, simultaneous interpretation, etc.).
2. The conference room audio system field amplification system (the conference room audio system amplification, multi-kinetic amplification).
3. Lighting stage system (environmental lighting, camera lighting, stage lighting, stage machinery).
4. Display system (projection, LCD, etc.).
5. Recording, editing and broadcasting system (monitoring camera, conference room audio system camera, broadcast camera, video recording and processing).
6. Signal processing system (signal distribution, switching, transmission, conversion, image processing, etc.).
7. Integrated system (intelligent linkage control system of AV center).
8. Conference room audio system support system (computer room, network, remote conference room audio system, etc.).
9. Professional digital audio and video wiring system.
Audio configuration for small conference room
1. Attendant microphone
Unidirectional condenser microphone; gooseneck microphone with red speech indication halo; microphone speech status indication; red Lights indicate speaking.
2. Mixing console
The mixing console, also known as the mixing console, will amplify, mix, distribute, and sound quality of multiple input signals. Finishing and sound effects processing, and then through the bus (Master) output. The mixer is an important equipment for broadcasting and recording programs in modern radio broadcasting, stage amplification, audio program production and other systems. Mixers can be divided into analog mixers and digital mixers according to the signal output method.
3. Equalizer
An equalizer is an electronic device that can separately adjust the amount of electrical signal amplification of various frequency components. The adjustment of the frequency of the electrical signal to compensate for the defects of the speaker and the sound field, to compensate and modify various sound sources and other special effects. Generally, the equalizer on the mixer can only perform three frequency electrical signals of high frequency, medium frequency and low frequency respectively. adjust. In a communication system, inserting an equalizer in a tethered system can reduce the effect of intersymbol interference.
4. Power amplifier
The power amplifier is referred to as “power amplifier”, which means that under the condition of a given distortion rate, it can generate the maximum power output to drive a certain Amplifier for a load (such as a speaker). The power amplifier plays a pivotal role of “organization and coordination” in the entire sound system, and to some extent dominates whether the entire system can provide good sound quality output.
5. Speakers
A speaker refers to a device that converts audio signals into sound. In layman’s terms, it means that the speaker box or the subwoofer box has its own power amplifier. After amplifying the audio signal, the speaker itself plays back the sound to make the sound louder.
6. Power sequencer
The power sequencer can start the power one by one from the previous device to the rear device, and when the power supply is turned off, the Turn off all kinds of electrical equipment in sequence from the rear stage to the front stage, so that all kinds of electrical equipment can be effectively managed and controlled in a unified manner, avoiding human error operation, and at the same time reducing the impact of electrical equipment on the power supply grid at the moment of switching. Impact, but also avoid the impact of induced current on the equipment, to ensure the stability of the entire power system.
Audio configuration for medium-sized conference rooms
1. Cabinets
Cabinets are generally made of cold-rolled steel plates or alloys to store computers and related control equipment. It can provide protection for the storage equipment, shield electromagnetic interference, and arrange the equipment in an orderly and neat manner to facilitate the maintenance of the equipment in the future. Cabinets are generally divided into server cabinets, network cabinets, console cabinets, etc.
2. Equalizer
An equalizer is an electronic device that can separately adjust the amount of electrical signal amplification of various frequency components. The adjustment of the frequency of the electrical signal to compensate for the defects of the speaker and the sound field, to compensate and modify various sound sources and other special effects. Generally, the equalizer on the mixer can only perform three frequency electrical signals of high frequency, medium frequency and low frequency respectively. adjust. In a communication system, inserting an equalizer in a tethered system can reduce the effect of intersymbol interference.
3. Feedback suppressor
In the sound reinforcement system, if the volume of the microphone is greatly increased, the sound from the speaker will be reduced. Howling will be transmitted to the microphone, this phenomenon is acoustic feedback. The existence of acoustic feedback not only destroys the sound quality, but also limits the expansion volume of the microphone sound, so that the sound picked up by the microphone cannot be reproduced well; the deep acoustic feedback will also make the system signal too strong, thus burning the power amplifier or speaker (usually burning speaker tweeter), resulting in loss. Therefore, once the sound feedback phenomenon occurs in the sound reinforcement system, we must find ways to stop it, otherwise, it will cause endless harm.
4. Conference host
The conference system host is a control device that can control all conference non-voting units, so as to realize the order of speech, limit speech, and vote in elections data collection statistics and so on. The simple conference host is a pure discussion conference host, with a simple function of limiting speech and volume adjustment. It is better to integrate the video tracking function or voting host function, and the highly integrated one has discussion, voting, video , Simultaneous interpretation function, etc.
5. Mixing console
The mixing console, also known as the mixing console, will amplify, mix, distribute, and sound quality of multiple input signals. Finishing and sound effects processing, and then through the bus (Master) output. The mixer is an important equipment for broadcasting and recording programs in modern radio broadcasting, stage amplification, audio program production and other systems. Mixers can be divided into analog mixers and digital mixers according to the signal output method.
6. Power amplifier
refers to the amplifier that can produce the maximum power output to drive a certain load (such as a speaker) under the condition of a given distortion rate . The power amplifier plays a pivotal role of “organization and coordination” in the entire sound system, and to some extent dominates whether the entire system can provide good sound quality output.
7. Speakers
A speaker refers to a device that converts audio signals into sound. In layman’s terms, it means that the speaker box or the subwoofer box has its own power amplifier. After amplifying the audio signal, the speaker itself plays back the sound to make the sound louder.
8. Wireless Microphone
The wireless microphone is composed of several pocket transmitters (which can be installed in pockets, with an output power of about 0.01W) and a It consists of centralized receivers. Each pocket transmitter has a different working frequency. The centralized receiver can simultaneously receive the voice signals of different working frequencies sent by each pocket transmitter.
9. Conference Phone
The conference phone is a terminal device with stronger full-duplex hands-free function based on ordinary handset phones . Compared with terminals such as ordinary phones and mobile phones, in the hands-free function state, the microphone of the conference phone can reach a distance of 3-5 meters with the conference phone as the center of the circle. Speak freely within an effective distance, and the conference phone can clearly transmit the voice to the other party. The volume of the conference phone speaker can reach 85-92 decibels, and the original sound of the other party can be clearly heard to everyone in the local venue. The conference phone is very simple to use, just connect the power supply and the telephone line to use.
Large conference room audio configuration
1. Speaker
A speaker is a transducer that converts electrical signals into sound signals. Great impact on sound quality. The speaker is a weaker component in the audio equipment, and it is a more important component for the sound effect. There are many types of speakers, and they vary widely in price. Audio electrical energy produces sound through electromagnetic, piezoelectric or electrostatic effects that cause its cone or diaphragm to vibrate and resonate (resonate) with the surrounding air.
2. Power amplifier
refers to an amplifier that can generate high power output to drive a load (such as a speaker) under a given distortion rate . The power amplifier plays a pivotal role of “organization and coordination” in the entire sound system, and to some extent dominates whether the entire system can provide good sound quality output.
3. Mixing console
The mixing console, also known as the mixing console, will amplify, mix, distribute, and sound quality of multiple input signals. Finishing and sound effects processing, and then through the bus (Master) output. The mixer is an important equipment for broadcasting and recording programs in modern radio broadcasting, stage amplification, audio program production and other systems. Mixers can be divided into analog mixers and digital mixers according to the signal output method.
4. Digital audio system processor
A digital audio processor is a digital audio signal processing device. It first converts the multi-channel input analog signal into a digital signal, and then performs a series of tunable algorithm processing on the digital signal to meet the application requirements of improving sound quality, matrix mixing, noise cancellation, echo cancellation, and feedback cancellation. Then output multi-channel analog signal through digital-to-analog conversion.
5. Power sequencer
The power sequencer can start the power supply one by one from the previous device to the rear device, and when the power supply is turned off, the Turn off all kinds of electrical equipment in sequence from the rear stage to the front stage, so that all kinds of electrical equipment can be effectively managed and controlled in a unified manner, avoiding human error operation, and at the same time reducing the impact of electrical equipment on the power supply grid at the moment of switching. It also avoids the impact of the induced current on the equipment and ensures the stability of the entire power system.
6. Feedback suppressor
In the sound reinforcement system, if the volume of the microphone is greatly increased, the sound from the speaker will be reduced. Howling will be transmitted to the microphone, this phenomenon is acoustic feedback. The existence of acoustic feedback not only destroys the sound quality, but also limits the expansion volume of the microphone sound, so that the sound picked up by the microphone cannot be reproduced well; the deep acoustic feedback will also make the system signal too strong, thus burning the power amplifier or speaker (usually burning speaker tweeter), resulting in loss. Therefore, once the sound feedback phenomenon occurs in the sound reinforcement system, we must find ways to stop it, otherwise, it will cause endless harm.
7. Wireless microphone
The wireless microphone is composed of several pocket transmitters (which can be installed in pockets, with an output power of about 0.01W) and a It consists of centralized receivers. Each pocket transmitter has a different working frequency. The centralized receiver can simultaneously receive the voice signals of different working frequencies sent by each pocket transmitter.
8. Conference control host
The conference control host is a control device that can control all conference attendance units, so as to achieve such as speaking order, limiting speech, Election voting data collection statistics and other functions. The simple conference host is a pure discussion conference host, with a simple function of limiting speech and volume adjustment. It is better to integrate the video tracking function or voting host function, and the highly integrated one has discussion, voting, video , Simultaneous interpretation function, etc.
9. Central control system
It is used in multimedia classrooms, multi-functional conference halls, command and control centers, intelligent homes, etc. Control panel, computer monitor, touch screen and wireless remote control and other equipment, through computer and central control system software to control projector, display stand, DVD player, video recorder and other equipment.
Conference audio equipment installation
1. Determine the type of speakers according to the needs, and it is best to use professional ones for conference rooms.
2. The room should be sound-absorbing, such as making some sound-absorbing materials on the walls, and laying some carpets on the ground.
3. Determine the sound pressure level to be achieved, and the number and characteristics of speakers. The sound pressure level of the first class banquet hall and conference room should be greater than or equal to 103dB, and the second class should be greater than or equal to 98dB. The sound power is about 600–800W. Four professional speakers are required, and two can be distributed in the front and rear. It is the best for hoisting, and it is also possible to use ground brackets. Each speaker has 400W—600W, and the sensitivity of each speaker is 98—103dB.
4. Professional speakers should be used with professional equipment, such as mixers, conference microphones, power amplifiers, etc. If you have enough money, you can add equalizers, effects, feedback suppressors, compressors, and more.
5=Connection sequence: microphone→mixer→equalizer→amplifier→speaker or: microphone–equalizer–amplifier–speaker.
Conference audio system operation
1. Control the volume of conference audio system
If you need to increase the volume, you can swipe right; select “Increase Speaker Volume” or “Decrease Speaker Volume”.
2. Play video
Delete the check mark from “Pause Remote Video” in the “Tools” bar, or click “Play” directly .
3. Pause video
Also select “Pause Remote Video” on the “Tools” bar or click “Stop” directly, other participants are still Video can be seen.
4. Floating window
To watch the video in a separate browser window, you can select “floating” to watch, the video floating window can be moved to the computer The current screen comes up.
5. Mute
Select “Speaker Mute” in the toolbar, or select the checkbox of the speaker icon in the system.
Conference audio equipment failure
1. The audio is silent
Check whether all equipment are turned on, and whether the volume control buttons of each equipment are adjusted to the appropriate position , whether the path switch of each channel on the mixer is gated, and check whether each connecting line is connected correctly and reliably. If there is still no sound, it needs to be checked step by step, which can be checked from back to front, or from front to back.
2. The system hums loudly
The hum is often due to poor or incorrect grounding, the equipment of the system is not on the same power grid, and the ground potential is seriously different Caused, and the shielding layer of the connecting wire is desoldered or the shielding wire is connected incorrectly to form a ground current loop, which will also cause a loud hum. Therefore, we should focus on checking these aspects, and if necessary, add an audio transformer for isolation, so as to disconnect the “ground” between the front and rear equipment, and the signal is still smooth.
3. System clipping distortion
First check whether the clipping indicator on each device is on, if it is not found that the clipping indicator is continuous If it is bright, you can choose the system to lower the volume by a few dB by a device in the middle to determine whether there is clipping distortion in front of the device or clipping distortion generated behind the device. In this way, after adjusting the fader a few times, you can tell which level the clipping is coming from. Generally speaking, if it is indeed the clipping caused by the signal being too strong, the volume level should be lowered on the front-end device. Equipment must be replaced.
4. The sound of the audio system is low
The low sound is often caused by cable problems. If the connecting line is short-circuited, the plug and socket are not well matched, and the connecting line is soldered, etc., after judging that there is no problem with the connecting line, suspect the equipment, check which equipment is faulty, and then replace the equipment. If the sound is small and the sound field is seriously uneven, it should be considered whether the phase of the speakers is wrong.
5. System interference noise
When designing the system, pay attention to the balanced connection, and all audio lines up to the input end of the power amplifier should be well shielded the audio cable, and the length of the connecting wire should not be too long, and the grounding is good. When these measures are in place, and interference signals appear, you should consider adding RF filters. View more conference audio system fault knowledge>>
