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US7672839B2 - Detecting audio signal activity in a ...
https://patents.google.com/patent/US7672839B2/en#:~:text=A%20method%20for%20detecting%20the%20presence%20or%20absence,of%20the%20communication%20system%20based%20on%20that%20determination.
A design guide for implementing audio signal detection
https://www.planetanalog.com/a-design-guide-for-implementing-audio-signal-detection/
There may also be no signal at all. These possibilities must be considered when detecting audio signals in order to distinguish noise and no-signals from true audio signals such a human speech, music, and natural sound. Principles of audio signal detection. The human ear can hear frequencies in the approximate range of 20 Hz to 20,000 Hz.
A design guide for implementing audio signal detection ...
https://www.ednasia.com/a-design-guide-for-implementing-audio-signal-detection/
Audio signal presence storage: Audio signal presence storage is carried out by DFF0, as shown in Figure 2. The signal is set using P DLY—mode is both edge delay—and LUT (3-bit LUT13). No-audio signal: If the design doesn’t detect any audio signal during ~5 minutes, then it sets a high level on PIN11 (FiveMinutesAudioPause). Counting this time is carried out with an …
US7672839B2 - Detecting audio signal activity in a ...
https://patents.google.com/patent/US7672839B2/en
A method for detecting the presence or absence of an audio signal in a communications system in which an audio signal is encoded by a delta modulation encoding …
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