Patent ID: 7454072

Claim:
A data compression controller, comprising: a photographing unit for photographing an image of a subject using a pickup device unit and outputting corresponding image signals; an image signal processor for outputting processed digital image data by removing noise from the image signals and amplifying weak signals from the image signals; a sound detector for detecting sound and outputting a sound detection signal to a data recording controller when the sound detector detects a generated sound; the data recording controller for compressing the image data output by the image signal processor when a sound detection signal is received and for determining whether a received sound detection signal is greater than a predetermined sound level, wherein when the received sound detection signal is greater than the predetermined sound level, the data recording controller compares the processed digital image data of a previous frame with the processed digital image data of a present fame and determines whether the processed digital image data has changed, wherein, if the processed digital image data between the processed digital image data of a previous frame and the processed digital image data of a present fame has changed, the data recording controller performs a high quality compression; and a compressed image storage unit for storing the compressed images output by the data recording controller.