Wireless video transmission device and wireless video reception device

摘要

A technique is provided for using, in a wireless video transmission device and a plurality of wireless video reception devices which intermittently perform signal reception processing within standby periods, a human body detection unit to accelerate the start-up of the wireless video transmission and reception devices. When the presence of a person is detected by the human body detector, a person detection signal is sent to a wireless video reception device or the transmission device to thereby limit usable communication channel candidates in number. The limited number of usable channel candidates are then used to perform intermittent signal reception, thereby shortening the searching time cycle of such intermittent reception within a standby period, thus lessening the startup time from the standby state between the wireless video transmission and reception devices and also reducing standby power thereof.

主权项

1. A wireless video reception device configured to receive a video signal sent wirelessly from a wireless video transmission device, said wireless video reception device comprising:
a human detection unit which detects information concerning presence of a person; a transmitter/receiver unit which, by using one of a predetermined number of communication channels, receives the video signal from said wireless video transmission device and performs wireless communication with said wireless video transmission device; and a control unit which is coupled to said human detection unit, wherein said control unit transmits, from said transmitter/receiver unit to said wireless video transmission device, a person-detection signal based on the detected information, by using a preset one of said predetermined number of communication channels, when the presence of the person is detected by said human detection unit while operating in a first standby mode of said wireless video reception device, wherein in the first standby mode, said wireless video reception device intermittently searches all said predetermined number of communications channels to be used for wireless communication, and when said transmitter/receiver unit receives a reply command in response to said person-detection signal from said wireless video transmission device, said wireless video reception device transitions to a second standby mode which intermittently searches selected communication channels selected from and fewer in number than said predetermined number of said communication channels, where the selected communication channels are selected based on a predetermined selection scheme; said control unit, when a control command for starting said wireless video transmission device or said wireless video reception device is received in said second standby mode, sends from said transmitter-receiver unit a startup request signal based on said control command, by using one of said selected communication channels, and wherein said selected communication channels include the communication channel via which said person-detection signal is transmitted.