INTERACTIVE MONITOR SYSTEM

PURPOSE: To realize the interactive monitor at a low cost in which efficient recording is attained in the case of a small capacity of a recording medium by increasing the compression rate for information with less importance in image and voice information and decreasing the compression rate for information with higher importance for the recording. CONSTITUTION: When a visitor in the usual state enters an installed location of a transmitter side, a sensor senses it that an image signal change amount of the visitor is less. A CPU gives a command of increasing the compression rate to an image coding section 121 and the section 121 changes the image compression rate according to the command and gives an image frame to a frame length detection section 122. The detection section 122 ranks the importance of the image information according to the length of frames and generates a label. A memory control section 110 superimposes the label to a content of a frame memory and stores the result in a loop memory 111 and the data are transferred to an image memory 112, in which the data are tentatively stored. On the occurrence of emergency, an image signal change amount of the visitor is much, the CPU commands the reduction of the compression rate, and the data are transferred up to the image memory 112 similar to that of the usual state and stored tentatively therein. Then the CPU applies transfer control of monitor information to an opposite party terminal equipment.