Abstract: A non-contact body temperature measuring device includes a temperature measuring unit, a Doppler radar, a processing unit, and a display unit. The temperature measuring unit measures a temperature of a human body in a non-contact manner. The Doppler radar emits radar waves to the human body and receives reflected radar waves. The processing unit, which is electrically connected to the temperature measuring unit and the Doppler radar, determines measurement spots on the human body based on the reflected radar waves, controls the temperature measuring unit to measure temperatures of the measurement spots, and generates a body temperature measuring value based on the temperatures of the measurement spots. The display unit is electrically connected to the processing unit for displaying the body temperature measuring value.

Abstract: A method for filtering noise of lens operation is applicable to a controller being communicably connected with a video recorder. The method includes: sending, by the controller, a recording instruction configured to control the video recorder to perform a video recording and an audio recording; sending, by the controller, a lens operation instruction configured to control a lens of the video recorder to perform an operation; reading, by the controller, an inverted noise signal associated with the operation receiving, by the controller, an audio recording signal generated by the video recorder when the video recorder performs the operation; and synthesizing, by the controller, the audio recording signal and the inverted noise signal to output a synthesized audio signal.

Abstract: A method for filtering noise of lens operation is applicable to a controller being communicably connected with a video recorder. The method includes: sending, by the controller, a recording instruction configured to control the video recorder to perform a video recording and an audio recording; sending, by the controller, a lens operation instruction configured to control a lens of the video recorder to perform an operation; reading, by the controller, an inverted noise signal associated with the operation receiving, by the controller, an audio recording signal generated by the video recorder when the video recorder performs the operation; and synthesizing, by the controller, the audio recording signal and the inverted noise signal to output a synthesized audio signal.