Patent ID: 8086088

Claim:
A method for recording digital video, comprising: detecting an audio signal by an audio detector of a camera and detecting a motion by a video detector of the camera; recording audio data and video data under an audio detection mode for a first time period in response to the audio signal detected by the camera; determining whether the audio signal exists after the first time period; stopping the recording of the audio data and the video data, if the audio signal does not exist after the first time period; and recording the audio data and the video data under a general mode, if the audio signal exists after the first time period, wherein: recording the audio data and the video data under the general mode comprises recording the video data at a first speed with a first screen quality; and recording audio data and the video data under the audio detection mode comprises recording the video data at a second speed with a second screen quality, the first speed being lower than the second speed and the first screen quality being lower than the second screen quality.