Abstract: An imaging device outputs video data with an image signal obtained from imaging an object, records video data onto a record medium, reproduces video data therefrom, outputs first time information from a clock section, communicates with another device through a first communication interface according to a predetermined protocol, and exchanges video data with the other device. A video-device automatically obtains second time information as reference from the outside of the video-device, processes a video signal, communicates with the other device through a second communication interface according to the protocol, and exchanges video data with the other device. When connected through the first and second communication interfaces, the video-device transmits the second time information to the imaging device. The imaging device receives the second time information and sets a time for the clock section with the received second time information.

Abstract: A constant voltage regulator and registers R1 and R2 generate a reference voltage with at least one of voltages supplied from a battery and an AC adaptor. The reference voltage is supplied to a first input terminal of a comparator. An input voltage supplied from the AC adaptor and divided by registers R3 and R4 is supplied to a second input terminal of the comparator. The comparator compares the reference voltage with the input voltage. When the reference voltage is lower than the input voltage, an FET switch SW1 is turned on and power is supplied from the AC adaptor side. When the reference voltage is higher than the input voltage, an FET switch SW2 is turned on and power is supplied from the battery side.

Abstract: An imaging device outputs video data with an image signal obtained from imaging an object, records video data onto a record medium, reproduces video data therefrom, outputs first time information from a clock section, communicates with another device through a first communication interface according to a predetermined protocol, and exchanges video data with the other device. A video-device automatically obtains second time information as reference from the outside of the video-device, processes a video signal, communicates with the other device through a second communication interface according to the protocol, and exchanges video data with the other device. When connected through the first and second communication interfaces, the video-device transmits the second time information to the imaging device. The imaging device receives the second time information and sets a time for the clock section with the received second time information.

Abstract: A constant voltage regulator and registers R1 and R2 generate a reference voltage with at least one of voltages supplied from a battery and an AC adaptor. The reference voltage is supplied to a first input terminal of a comparator. An input voltage supplied from the AC adaptor and divided by registers R3 and R4 is supplied to a second input terminal of the comparator. The comparator compares the reference voltage with the input voltage. When the reference voltage is lower than the input voltage, an FET switch SW1 is turned on and power is supplied from the AC adaptor side. When the reference voltage is higher than the input voltage, an FET switch SW2 is turned on and power is supplied from the battery side.