Abstract: A voice activity detection method includes a voice pickup module, a processing module coupled to the voice pickup module and a prompt module coupled to the processing module. The processing module is used to perform a voice activity detection method, including: receiving voice information by the voice pickup module; acquiring a volume value of the voice information by the processing module; determining by the processing module whether the volume value is less than or equal to a first volume threshold; when it is determined that the volume value is less than or equal to the first volume threshold, generating by the prompt module a first prompt message for increasing the volume value; and when it is determined that the volume value is more than the first volume threshold, generating by the prompt module a second prompt message that indicates a volume value standard has been satisfied.

Abstract: A method for calculating position coordinates includes obtaining an image by a camera module, obtaining at least one set of angle data of the camera module, obtaining first position data of the camera module, obtaining depth information of an image point in the image, and calculating second position data of the image point according to the depth data, the first position data and the at least one set of angle data.