Abstract: A notification device includes a pressure sensor, a microcontroller and an output device. The pressure sensor is used to detect the environment to provide a plurality of sound signals in time domain. The microcontroller is used to calculate a dynamic threshold corresponding to a current time point based on the sound signals in time domain during a first time period prior the current time point. of the pressure signal in a period of time. When a magnitude of the sound signal in time domain at the current time point is greater than the dynamic threshold, the microcontroller sends a feedback signal to the output device. The output device is connected to the microcontroller. The output device is used to provide a feedback action according to the feedback signal.

Abstract: A notification device includes a pressure sensor, a microcontroller and an output device. The pressure sensor is used to detect the environment to provide a pressure signal. The microcontroller is connected to the pressure sensor to receive the pressure signal. The microcontroller is used to calculate a dynamic threshold of the pressure signal in a period of time. When a magnitude of the pressure signal is greater than the dynamic threshold, the microcontroller sends a first feedback signal to the output device. The output device is connected to the microcontroller. The output device is used to provide a first feedback action according to the first feedback signal.