In the context of meetings, it’s common to encounter situations where speakers either move closer or further from the microphone, causing fluctuations in volume levels. This can disrupt the flow of communication, especially in noisy environments where background sounds can mask the intended message. To address these issues, the LY controllable audio and video system features two critical components: an Automatic Gain Controller (AGC) and an Ambient Noise Compensator. These tools help maintain consistent audio quality regardless of the speaker's proximity to the mic or the ambient noise level.
Firstly, let’s discuss the Automatic Gain Controller (AGC). Its primary objective is to stabilize fluctuating audio signals, ensuring they remain at a consistent level. For instance, when multiple individuals speak into the same microphone, their voices may vary significantly in volume. The AGC adjusts these variations by applying appropriate gain levels to keep the output at a desirable level. Key parameters include:
1. **Expected Output Level**: This sets the desired volume level, ranging from -40dB to 0dB.
2. **Detection Threshold**: This determines when the AGC should activate, based on signal strength.
3. **Response Time**: How quickly the AGC reacts once the signal reaches the threshold.
4. **Recovery Time**: The time taken for the system to return to normal levels after the signal stabilizes.
5. **Gain Ratio**: Determines the degree of amplification or attenuation, ensuring smooth transitions.
6. **Noise Threshold**: Filters out unwanted noise below a certain level.
7. **Leakage Enable**: Allows temporary bypassing of AGC under specific conditions.
8. **Leakage Time**: Sets the duration during which the system operates outside AGC control.
Next, the Ambient Noise Compensator plays a vital role in environments with fluctuating background noise. Human ears are sensitive to noise masking effects, meaning louder ambient noises can obscure softer sounds. The Ambient Noise Compensator monitors changes in background noise using a dedicated microphone and adjusts the output gain accordingly. This ensures that the audience hears the main audio signal clearly, regardless of the surrounding noise.
Key settings for the Ambient Noise Compensator include:
1. **Maximum and Minimum Output Gain**: Limits the range of output levels to ensure they align with system capabilities.
2. **Gain Speed**: Controls the rate of gain adjustments, allowing for gradual or rapid responses.
3. **Gap Sampling Threshold**: Defines the level at which ambient noise sampling begins.
4. **Gain-Sense Ratio**: Establishes how much the gain increases relative to the noise level.
5. **Gap Time**: Specifies the duration of silence needed before sampling ambient noise.
6. **Average Weighting**: Averages multiple noise samples for more precise adjustments.
7. **Noise Standard Sampling Value**: Adjusts gain based on the current ambient noise level.
8. **Manual Output Gain**: Manually updates the output gain before automatic sampling.
9. **Get Threshold**: Resets the system to normal conditions by recalibrating the ambient noise level.
These sophisticated features enable the LY system to deliver clear and consistent audio experiences, even in challenging environments. By combining AGC and Ambient Noise Compensation, the system ensures that every participant receives an optimal listening experience, enhancing overall meeting productivity.
As noted by Chief Engineer of Li Yun Institute, Zhuang Jinkui, "Our system is designed to adapt seamlessly to dynamic audio scenarios, providing reliable performance across diverse settings." With such advanced technology, the LY controllable audio and video system stands out as a leader in its field, offering solutions tailored to modern communication needs.
[Source: Chief Engineer of Li Yun Institute: Zhuang Jinkui]
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