During meetings, we often encounter situations where speakers move closer or further from the microphone, causing fluctuations in volume levels. This inconsistency disrupts the flow of communication and can significantly impact the meeting's progress. Similarly, in crowded environments, the ambient noise can mask the amplified sound, making it difficult for participants to hear clearly. The LY Controllable Audio and Video System addresses these issues using two key components: an Automatic Gain Controller (AGC) and an Environmental Noise Compensator.
The Automatic Gain Controller (AGC) is designed to stabilize sound levels by dynamically adjusting the output gain. Its primary function is to prevent abrupt changes in signal strength, especially when different individuals use the same microphone. For instance, when speakers vary in voice intensity or distance from the mic, the AGC ensures the output remains consistent. Key parameters include:
1. **Target Output Level**: Defines the desired output volume, ranging from -40dB to 0dB.
2. **Detection Threshold**: Sets the point at which the AGC begins to amplify the signal.
3. **Response Time**: Controls how quickly the AGC reacts once the threshold is reached.
4. **Recovery Time**: Dictates how fast the system returns to normal levels after amplification.
5. **Gain Ratio**: Adjusts the extent of amplification or attenuation.
6. **Noise Threshold**: Filters out unwanted noise below a certain level.
7. **Leakage Enable**: Provides exceptions to the AGC control under specific conditions.
8. **Leakage Time**: Specifies the duration during which the AGC is inactive.
Complementing the AGC is the Environmental Noise Compensator, which adjusts the output gain based on detected ambient noise levels. Human ears are sensitive to masking effects, where background noise can distort the clarity of speech. The compensator monitors noise via a dedicated microphone and adjusts the volume to ensure intelligibility regardless of fluctuating environmental conditions.
Key features include:
1. **Maximum and Minimum Output Gains**: Setting limits for the highest and lowest possible outputs.
2. **Gain Speed**: Controls how rapidly the gain adjusts.
3. **Gap Sampling Threshold**: Determines when to sample ambient noise.
4. **Gain-Sense Ratio**: Balances the relationship between noise levels and gain adjustments.
5. **Gap Time**: Defines the silence period required before sampling noise.
6. **Average Weighting**: Averages multiple noise samples for a more precise adjustment.
7. **Noise Standard Sampling Value**: Establishes a baseline noise level for gain adjustments.
8. **Manual Output Gain Update**: Allows users to manually adjust gain settings.
9. **Threshold Calibration**: Resets the system to a normal ambient noise level.
These tools collectively enhance audio quality, ensuring clear communication in diverse environments. As noted by Chief Engineer Zhuang Jinkui from the Li Yun Institute, these innovations represent significant strides in audio technology, offering solutions tailored to real-world challenges.
This text reflects the practical application of advanced audio engineering principles, providing insights into how these systems operate in dynamic settings.
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