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Troubleshooting and Solution for Meeting Hall Sound System

Apr 23-2024

What Should We Pay Attention to When Matching Noise-Canceling Microphone Array?


Choosing the right microphone is essential in presentation settings. Various types of microphones such as desktop microphones, handheld microphones, ceiling microphones, as well as clip-on and head-worn microphones each have their unique designs and uses. However, regardless of the type, podium microphones stand out with their elegant design and emphasis on the importance of the speaker.


The Uniqueness of Noise-Canceling Microphone Array


It is worth noting that, as a special type of microphone device, noise-canceling microphone array has slightly different functions from regular microphones. It is not only one microphone responsible for recording sound input, but it utilizes the design of multiple microphones. Typically, this microphone array is a device consisting of two microphones placed on the left and right sides. This layout allows for recording from different directions in the room, achieving dynamic stereo recording.


Key Issues in Matching Noise-Canceling Microphone Array


One of the key issues in selecting and using noise-canceling microphone array is the matching of the microphones. All microphones in the array must be similar and closely matched to ensure the quality and balance of the recording. Otherwise, a series of issues may arise:


Microphone Gain Inconsistency


One microphone in the array has higher gain, leading to unbalanced recording.


Microphone Phase Differences


Microphones are out of phase, causing one microphone to record before the other, resulting in unsynchronized recording.


Mismatch in Directionality and Sensitivity


One microphone picks up sound from all directions, while the other microphone only picks up sound from one direction, causing unbalanced recording.


Three Aspects of Matching Noise-Canceling Microphone Array


When addressing matching issues, special attention must be paid to three aspects: directionality, sensitivity, and phase.


Directionality


The microphone array must have the same directionality to ensure they can consistently pick up sound. Different directional microphones will result in unbalanced recording, so consistency must be maintained when constructing the array.


Sensitivity


The sensitivity of the microphones must be closely matched to prevent one microphone from dominating the sound during recording, causing an unbalanced effect. The maximum allowable sensitivity difference is usually ±1.5 dB.


Phase


Phase is crucial in determining when the microphone starts and stops recording. The phase difference between microphones should be kept within an acceptable range, usually ±1.5 degrees, to ensure synchronized and coordinated recording.


Overall, the popularity of noise-canceling microphone arrays in the audio industry is inseparable from high requirements for matching. By focusing on directionality, sensitivity, and phase, ensure that the microphone array can provide high-quality, balanced, and coordinated recording effects to meet the needs of different occasions.

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