| 摘要 |
A device is provided for remotely controlling an electrically activated unit, such as a camera or appliance receptacle, by utilizing a conventional infrared transmitter. The device includes an infrared detector for detecting an infrared signal pulse from the conventional transmitter and which produces an electrical output pulse signal for each detected infrared pulse. A counter counts the output signal pulses from the infrared detector while a timer periodically resets the counter to zero. Whenever the count in the counter exceeds a predetermined number before being reset by the timer, an output signal is generated which activates the remote unit. The counter and the timer thus prevent unintended activation of the remote unit by ambient infrared radiation.
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