In the early stages, to ensure the sound quality of the entire conference system, it is necessary to comprehensively and meticulously collect and analyze user requirements and venue information. By appropriately integrating and configuring equipment at all levels, it is possible to meet diverse needs arising from different venue conditions, user groups, and usage habits. However, a well-designed system configuration and proper installation alone are not sufficient to guarantee optimal conference sound reinforcement. Ultimately, professional system calibration is crucial for achieving the desired conference sound reinforcement results.
Compared to the calibration of other sound reinforcement systems, conference systems have their own specific focus.
First, a conference system must prioritize voice clarity and volume balance. Since meetings typically involve multiple speakers, it is essential to ensure that everyone can clearly hear their own voice and that volume remains balanced throughout the entire meeting.
Second, a conference system must also address issues such as noise suppression and echo cancellation. In indoor environments, various factors can easily lead to noise and echoes, which can negatively impact the effectiveness of the meeting.
Therefore, a conference system must implement appropriate measures to reduce noise and eliminate echoes.
I. Audio Quality Processing
In conference systems, voice signals are the primary audio source. Since most microphones are condenser microphones, it is necessary to selectively remove low-frequency sounds that affect speech intelligibility; this is achieved using a high-pass filter (HPF). This effectively eliminates the proximity effect of condenser microphones and improves speech intelligibility.
In addition, controlling the microphone’s tone and volume is crucial. If the mid-to-high frequencies are too pronounced or the volume is too high, it can cause auditory discomfort and may even damage hearing. Therefore, when adjusting the microphone, it is important to set the tone and volume appropriately to ensure that attendees can hear the meeting content comfortably.
In addition to microphones, loudspeakers are also a crucial component of a conference system. The sound quality and volume of the loudspeakers have a critical impact on the overall sound reinforcement performance of the system. Therefore, when configuring loudspeakers, it is necessary to select the appropriate models and quantities based on the size and shape of the venue, as well as the audience’s seating arrangement. At the same time, proper calibration and optimization are required to ensure that the sound quality and volume of the loudspeakers are optimized.
II. Feedback Suppression
To fundamentally suppress feedback, in addition to carefully selecting speaker models and planning their installation layout based on the actual conditions of the meeting space during the initial planning phase, it is also necessary to make corresponding fine-tuning adjustments to the conference system. For example, bidirectional feedback suppression technology can be employed to reduce the occurrence of feedback by detecting and suppressing feedback signals. Additionally, adaptive feedback control technology can be used to automatically adjust feedback suppression parameters based on the conditions at the meeting site.
III. Filtering Out Ambient Noise
In a conference system, in addition to human voices and external audio sources, other ambient noises—such as footsteps, air conditioning fan noise, the clinking of cups, and the rustling of paper—must also be isolated as much as possible. When amplified by the sound reinforcement system, these noises can be transmitted outward, affecting the quality of the conference audio and even disrupting the atmosphere of the meeting. Therefore, it is essential to consider microphone pickup patterns and equipment selection during the initial stages of system design.
To filter out the aforementioned ambient noise as much as possible, it is necessary to optimize the system based on the specific environment while integrating existing equipment. First, appropriate microphones must be selected and positioned strategically to ensure that all required sounds are captured. Second, the noise sampling and synchronous filtering functions of peripheral control devices are also crucial; optimal noise reduction can be achieved by analyzing and processing the frequency and amplitude of different sounds. Additionally, it is necessary to consider connecting external devices equipped with noise-gating functions—such as noise-canceling headphones or microphones—to better control the impact of ambient noise.
In practical applications, adjustments and optimizations must be made according to different scenarios and requirements. For example, installing sound-absorbing materials inside a conference room can effectively reduce noise such as footsteps and the scraping of furniture; whereas in large conference halls, more complex audio control systems are needed to achieve comprehensive noise reduction.
IV. Selection of the Meeting Format
When selecting a conference system configuration, it is necessary to refine the settings for conference modes based on actual usage scenarios and user needs. For example, conference speaking modes such as automatic mixing, highest priority, first-in-first-out, request-to-speak, and ID card authentication can be appropriately configured according to different meeting formats to fully leverage the features and performance of each conference system.
Automatic mixing is a common conference speaking mode that automatically blends audio from multiple microphones to ensure the speaker’s voice is clear and distinct. The “highest authority” mode controls speaking privileges; typically, the chairperson or administrator holds the highest authority, and other participants must wait for permission from the chairperson or administrator before speaking. The “first-in, first-out” (FIFO) mode is a queuing system for speaking, typically used to limit the number of speakers and their speaking time to ensure every participant has sufficient opportunity to speak.
“Request to Speak” and “ID Card Authentication” are two more specialized conference speaking modes. In the “Request to Speak” mode, participants can request permission to speak by pressing a button or raising their hand, and the moderator can decide whether to approve the request based on the situation; “ID Card Authentication” is an identity verification mode that confirms a participant’s identity by inserting a specific ID card.
