4.3.2 Parameter information:
Tracking Threshold: When it is detected that the microphone input signal is greater than or equal to
the tracking threshold, the system will automatically enable the tracking function.
Response Time: The maximum interruptible time for a valid signal. If you use the microphone to
speak, set the response time to 3 seconds, the signal is still considered to be continuously valid
within 3 seconds of pause during the speech, and the signal is considered invalid if it exceeds 3
Time to Back to Panorama: when no one is speaking, after the time to switching back to panorama,
the camera will be switched back to panorama too.
The parameters are the same as the camera tracking parameters.
4.4 Auto Feedback Control(AFC)
4.4.1 The sound signal collected by the microphone includes the sound signal amplified by the
speaker. The signal is continuously superimposed and amplified in the sound feedback loop, and the
positive feedback generates vibration and howling. AFC obtains the frequency of howling by
analyzing the power spectrum of fixed-size audio frame by frame. After detecting the components,
it uses a notch filter or a frequency shifter to change the amplitude and phase of the audio to
achieve howling suppression.
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