| 摘要 |
A remote control system is disclosed which comprises a first pulse generator for producing first pulse signals, a pulse width modulator for varying a pulse width of the first pulse signals in response to a kind of controls and producing second pulse signals as pulse-width-modulated signals, a first detector detecting a rising portion of the second pulse signals and producing third pulse signals having a first pulse width narrower than the pulse width of the second pulse signals, a second detector for detecting a trailing portion of the second pulse signals and producing fourth pulse signals having a second pulse width narrower than the pulse width of the second pulse signals and different from the first pulse width of the third pulse signals, a transmitter for transmitting the third pulse signals and fourth pulse signals sequentially, a receiver for receiving the third and fourth pulse signals, a pulse width discriminator for separating the third pulse signals and fourth pulse signals and producing fifth pulse signals corresponding to the third pulse signals and sixth pulse signals corresponding to the fourth pulse signals, a bistable circuit made into one status by the fifth pulse signals and another status by the sixth pulse signals, a second pulse generator controlled by the output of the bistable circuit, producing seventh pulse signals having a repetitive rate higher than the repetitive rate of the first pulse signals, a first counter for counting a pulse number of the seventh pulse signals from the second pulse generator and producing a first output signal when a content of the first counter becomes a predetermined condition. |
