Abstract: A remotely operated wireless video/audio hand-held monitoring system comprises a central station having a display and a speaker, and at least one remote terminal having a camera and a microphone. The central station is adapted to send out control command data containing a remote terminal identifier, a communication frequency channel number and any one of a test command, a power on command and a power off command, to receive response data corresponding to the control command data and to reproduce video and audio signals transmitted at a frequency corresponding to the communication frequency channel number, respectively, through the display and speaker in response to the received response data.

Abstract: A two-way wireless personal video/audio communication system comprises a microprocessor unit for controlling the overall operation of the system. Audio and video transmission/reception circuits are responsive to audio and video channel control signals and audio and video transmission control signals from the microprocessor unit, for adjusting audio and video transmission/reception channel frequencies and driving audio and video power amplifiers, respectively. A video path control circuit acts to transfer a video signal from a camera circuit to a display circuit in an N mode, a video signal from a remote terminal, received through the video transmission/reception circuit, to the display circuit in an R mode and the video signal from the camera circuit to both the display circuit and video transmission/reception circuit in an X mode.