sound system
1. Pickup and sound reinforcement in this venue In general, videoconferencing venues must often adapt to two different usage states: speaking on the stage and speaking on the stage. These two use states have a significant impact on the sound reinforcement of the venue. Because the main speakers of small and medium-sized lecture halls are usually installed on the walls on both sides of the booth, when the speakers are on the stage, the microphones are not in the coverage of the main speakers, and a high sound transmission gain can be obtained; when the audience speaks, the microphones have entered the main speakers. Coverage, transmission gain will inevitably decrease.
The solution to this problem is to try to keep the main speaker coverage area from the off-floor speech position while speaking in the audience. There are two methods that can be considered. One method is to make the main speaker mounting bracket with adjustable inclining angle. Turn the main speaker to reduce the inclining angle properly when speaking under the desk; the other method is to install the main speaker without fixed installation. Mount on the speaker stand and move the main speaker and stand upright when speaking under the desk. Both of these methods can make the microphone under the stage avoid the main speaker coverage area.
2. Sound reinforcement of far-end conference sound signals The far-end audio signals actually output by a video conference terminal often have problems such as insufficient sound volume, distortion, and noise (including hum). The audio output level of the videoconferencing terminal should be as large as possible, which can not only increase the volume but also improve the signal-to-noise ratio. Noise, especially communicative sound, is a common problem in videoconferencing audio systems. Most communicative sounds are caused by ground loops that are improperly grounded. The ideal solution is to add an audio isolator between the video conferencing terminal and the console input. The audio isolators preferably have a metal shield box and are grounded to protect the audio isolators from electromagnetic interference. The far-end conference sound signal is preferably sent to the mixing console one channel at a time, rather than using the signal selector and other signals (such as a player) to share one channel of the mixer.
3. Sending local venue sounds Local venue audio signals and local sound reinforcement should not use the same output signal of the mixer, but should be sent from the console auxiliary or grouping output port to the audio input of the video conference terminal. Adjust the level of the sent signal, and the volume of the local sound reinforcement does not affect each other; Moreover, although the echo suppression function has been integrated in most video conferencing terminals, the shunt output is more conducive to suppressing acoustic feedback or echo caused by the far site. .
4. Recording There are now high-priced multi-channel recording and playback equipment specially used for conference recording and recording; home hard disk/CD recorders that can record only one channel of video can also be used. If you only want to record, you can install recording software on your computer. However, some computer (especially mobile computers) sound cards have only microphone input ports and no line input ports. Therefore, you must use the signal from the “recording output†port of the mixer with two The resistive divider is attenuated to the microphone level, otherwise it may overload the sound card input, causing distortion of the recording.
Video system
1. When the camera system multi-channel camera, it is necessary to select the most appropriate screen display or send, so the image of each camera needs to be pre-monitored at the same time. This requires that the output of each camera be distributed first through a video splitter of 1 point, all the way to the video switching device, and the other channel to the monitor. In order to avoid too many monitors, screen segmentation can be used. It is also possible to use multi-channel 1 point 2 video distributors and multi-picture splitter products for video surveillance. If you want the camera to automatically track the spokesperson, it is best to use the "hand-in-hand" conference system to control camera tracking by manually turning on the speaking unit.
2. Display System At present, the main display uses many front projections. Just pay attention to limit the brightness of the environment, you can achieve a more satisfactory display. The "back-look" display set for the spokesperson usually uses a flat panel display. The quality of the image displayed by the plasma display is better than that of the liquid crystal display, but most of the reflections are obvious, but many "hard-screen" liquid crystal displays are also clearly reflective. However, the content of the video conference shows few dark scenes and the reflection may not be very obvious.
<br> <br> lighting system to correct color reproduction of the scene, lighting should use a video conference hall of 3200K trichromatic fluorescent, light, soft, and low-temperature energy. There are now dimmable three-color fluorescent lamps, using more flexible and convenient. Since the color temperature of natural light is much higher than that of three-primary lights, if these two light sources are irradiated at the same time, the image may suffer from color interference, so it is not appropriate to use it and try to avoid natural light.
Power supply and ground <br> <br> because there is often more important video conference meeting venue in order to ensure safe and reliable power supply system, to reduce the interference caused by the power supply, video conferencing equipment, lighting and air conditioning and other electrical power supply should be split , And video conferencing equipment is best installed online UPS. For safety, protective grounding is a must.
The venue was built environment <br> <br> sound problems at the venue in addition to architectural acoustics design of large-scale projects often overlooked. Due to the lack of acoustic concept or design cost savings, other small and medium-sized architectural design departments do not have the ability to build sound design. Therefore, special sound-building design is rarely performed. The decoration department is mainly based on aesthetics, and basically does not have sound design capabilities. Therefore, for a long time, the decorating results have used smooth decorative surfaces such as glass, stone, and metal everywhere. This has caused reverberation time to be too long, resulting in poor resolution and low sound transmission gain. Or, a large number of soft bags have been used to cause mid-range and high-frequency sound absorption. Excessive, dry sound. The videoconferencing venue mainly uses language sound reinforcement. Considering the requirement of speech intelligibility, the full-frequency reverberation time should be between 0.5s and 0.8s. Construction sound plays a pivotal role in sound effects and is particularly important for video conference venues. Therefore, building sound is a very important item. It is even more economical than using expensive equipment, and even has the effect of “doing more with lessâ€.
1. Pickup and sound reinforcement in this venue In general, videoconferencing venues must often adapt to two different usage states: speaking on the stage and speaking on the stage. These two use states have a significant impact on the sound reinforcement of the venue. Because the main speakers of small and medium-sized lecture halls are usually installed on the walls on both sides of the booth, when the speakers are on the stage, the microphones are not in the coverage of the main speakers, and a high sound transmission gain can be obtained; when the audience speaks, the microphones have entered the main speakers. Coverage, transmission gain will inevitably decrease.
The solution to this problem is to try to keep the main speaker coverage area from the off-floor speech position while speaking in the audience. There are two methods that can be considered. One method is to make the main speaker mounting bracket with adjustable inclining angle. Turn the main speaker to reduce the inclining angle properly when speaking under the desk; the other method is to install the main speaker without fixed installation. Mount on the speaker stand and move the main speaker and stand upright when speaking under the desk. Both of these methods can make the microphone under the stage avoid the main speaker coverage area.
2. Sound reinforcement of far-end conference sound signals The far-end audio signals actually output by a video conference terminal often have problems such as insufficient sound volume, distortion, and noise (including hum). The audio output level of the videoconferencing terminal should be as large as possible, which can not only increase the volume but also improve the signal-to-noise ratio. Noise, especially communicative sound, is a common problem in videoconferencing audio systems. Most communicative sounds are caused by ground loops that are improperly grounded. The ideal solution is to add an audio isolator between the video conferencing terminal and the console input. The audio isolators preferably have a metal shield box and are grounded to protect the audio isolators from electromagnetic interference. The far-end conference sound signal is preferably sent to the mixing console one channel at a time, rather than using the signal selector and other signals (such as a player) to share one channel of the mixer.
3. Sending local venue sounds Local venue audio signals and local sound reinforcement should not use the same output signal of the mixer, but should be sent from the console auxiliary or grouping output port to the audio input of the video conference terminal. Adjust the level of the sent signal, and the volume of the local sound reinforcement does not affect each other; Moreover, although the echo suppression function has been integrated in most video conferencing terminals, the shunt output is more conducive to suppressing acoustic feedback or echo caused by the far site. .
4. Recording There are now high-priced multi-channel recording and playback equipment specially used for conference recording and recording; home hard disk/CD recorders that can record only one channel of video can also be used. If you only want to record, you can install recording software on your computer. However, some computer (especially mobile computers) sound cards have only microphone input ports and no line input ports. Therefore, you must use the signal from the “recording output†port of the mixer with two The resistive divider is attenuated to the microphone level, otherwise it may overload the sound card input, causing distortion of the recording.
Video system
1. When the camera system multi-channel camera, it is necessary to select the most appropriate screen display or send, so the image of each camera needs to be pre-monitored at the same time. This requires that the output of each camera be distributed first through a video splitter of 1 point, all the way to the video switching device, and the other channel to the monitor. In order to avoid too many monitors, screen segmentation can be used. It is also possible to use multi-channel 1 point 2 video distributors and multi-picture splitter products for video surveillance. If you want the camera to automatically track the spokesperson, it is best to use the "hand-in-hand" conference system to control camera tracking by manually turning on the speaking unit.
2. Display System At present, the main display uses many front projections. Just pay attention to limit the brightness of the environment, you can achieve a more satisfactory display. The "back-look" display set for the spokesperson usually uses a flat panel display. The quality of the image displayed by the plasma display is better than that of the liquid crystal display, but most of the reflections are obvious, but many "hard-screen" liquid crystal displays are also clearly reflective. However, the content of the video conference shows few dark scenes and the reflection may not be very obvious.
<br> <br> lighting system to correct color reproduction of the scene, lighting should use a video conference hall of 3200K trichromatic fluorescent, light, soft, and low-temperature energy. There are now dimmable three-color fluorescent lamps, using more flexible and convenient. Since the color temperature of natural light is much higher than that of three-primary lights, if these two light sources are irradiated at the same time, the image may suffer from color interference, so it is not appropriate to use it and try to avoid natural light.
Power supply and ground <br> <br> because there is often more important video conference meeting venue in order to ensure safe and reliable power supply system, to reduce the interference caused by the power supply, video conferencing equipment, lighting and air conditioning and other electrical power supply should be split , And video conferencing equipment is best installed online UPS. For safety, protective grounding is a must.
The venue was built environment <br> <br> sound problems at the venue in addition to architectural acoustics design of large-scale projects often overlooked. Due to the lack of acoustic concept or design cost savings, other small and medium-sized architectural design departments do not have the ability to build sound design. Therefore, special sound-building design is rarely performed. The decoration department is mainly based on aesthetics, and basically does not have sound design capabilities. Therefore, for a long time, the decorating results have used smooth decorative surfaces such as glass, stone, and metal everywhere. This has caused reverberation time to be too long, resulting in poor resolution and low sound transmission gain. Or, a large number of soft bags have been used to cause mid-range and high-frequency sound absorption. Excessive, dry sound. The videoconferencing venue mainly uses language sound reinforcement. Considering the requirement of speech intelligibility, the full-frequency reverberation time should be between 0.5s and 0.8s. Construction sound plays a pivotal role in sound effects and is particularly important for video conference venues. Therefore, building sound is a very important item. It is even more economical than using expensive equipment, and even has the effect of “doing more with lessâ€.
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