Abstract: This invention is intended to be capable of accurately detecting whether an electric device is in a stand-by mode or power stoppage occurs. An electric device 20 includes a power supply circuit 12, a power stoppage detection circuit 15, and a control microcomputer 10. The power stoppage detection circuit 15 generates a detection signal based on a voltage input from the power supply circuit 12. This detection signal is input from the power stoppage detection circuit 15 to the control microcomputer 10. The control microcomputer 10 detects a state of an operation of the power supply circuit 12 based on the detection signal input from the power stoppage detection circuit 15. If the detection signal is not detected for a constant time or more, the control microcomputer 10 determines that the power stoppage occurs to the power supply circuit 12.

Abstract: This invention facilitates an operation after save recording of data in a hard disc if a residual capacity of a DVD is lessened while the data is recorded in the DVD. If it is detected that the residual capacity of the DVD is lessened while a program is recorded in the DVD, then save recording of the program in the hard disc is started, and the recording of the program in the DVD is stopped. If it is detected that the DVD is ejected and exchanged to a new DVD, the recording of the program in the new DVD is automatically started. While continuing the save recording of the program in the hard disc, the save-recorded program is time-shift reproduced from the beginning. The program reproduced from the hard disc is splice-recorded in the DVD.

Abstract: This invention is intended to be capable of accurately detecting whether an electric device is in a stand-by mode or power stoppage occurs. An electric device 20 includes a power supply circuit 12, a power stoppage detection circuit 15, and a control microcomputer 10. The power stoppage detection circuit 15 generates a detection signal based on a voltage input from the power supply circuit 12. This detection signal is input from the power stoppage detection circuit 15 to the control microcomputer 10. The control microcomputer 10 detects a state of an operation of the power supply circuit 12 based on the detection signal input from the power stoppage detection circuit 15. If the detection signal is not detected for a constant time or more, the control microcomputer 10 determines that the power stoppage occurs to the power supply circuit 12.

Abstract: A power supply feedback circuit for detecting a voltage of a secondary side of a transformer provided to a power supply circuit surely and stably and controlling a control microcomputer by supplying a proper voltage from a transformer to a control microcomputer.