Abstract: An electronic apparatus wherein a remote control signal received via a filter is decoded and, upon deciding that the control signal is a power cutoff instruction, a controlling microcomputer outputs a filter control signal for actuating the filter to place the apparatus in a reception standby mode while the microcomputer itself is also set in its low power state, hence preventing a malfunction that some noise derived from external light of a fluorescent lamp or the like is recognized erroneously as a remote control signal and that the apparatus is shifted in error from the low power state to its wake-up mode. Consequently, the power consumption can be reduced in the standby mode. The remote control signal consists of a fixed-width pulse and a succeeding control code, and upon detection of the fixed-width pulse, the controlling microcomputer is released from the low power state to wake up and then halts the operation of the filter.

Abstract: An electronic apparatus wherein a remote control signal received via a filter is decoded and, upon decision that the control signal is a power cutoff instruction, a controlling microcomputer outputs a filter control signal for actuating the filter to place the apparatus in a reception standby mode while the microcomputer itself is also set in its low power state, hence preventing a malfunction that some noise derived from external light of a fluorescent lamp or the like is recognized erroneously as a remote control signal and that the apparatus is shifted in error from the low power state to its wake-up mode. Consequently, the power consumption can be reduced in the standby mode. The remote control signal is composed of a fixed-width pulse and a succeeding control code, and upon detection of the fixed-width pulse, the controlling microcomputer is released from the low power state to wake up and then halts the operation of the filter.

Abstract: An IR keyboard 1 generates key code information corresponding to key operated to add break flag information indicating distinction between in-operation and operation release to the key code information as operation status information of the key to add terminator code information indicating that the key code information corresponding to key operation every once is completed to the last portion of the key code information to transmit, as key operation information, the key code information, the break flag information and the key code information by an infrared ray signal from a light emitting unit 11. Further, a light receiving unit 2 receives the infrared ray signal transmitted from the light emitting unit 11 to input key operation information of the IR keyboard 1 to a computer unit 3.