PULSE NOISE REJECTION CIRCUIT AND PULSE NOISE REJECTION METHOD THEREOF

摘要

A circuit for suppressing a pulse noise according to the present invention includes a filter circuit for converting a pulse type input signal into a filter signal of an increasing or decreasing type; a level reset circuit for receiving the input and output signals to reset the filter signal; and an output circuit for converting the filter signal into the output signal having a pulse type. The level reset circuit resets the filter signal into a high level when the input and output signals are high levels and resets the filter signal into a low level when the input and output signals are low levels. When the input and output signals have mutually different levels, the level reset circuit does not reset the filter signal. A method of suppressing a pulse noise according to the present invention includes the steps of converting a pulse type input signal into a filter signal of an increasing or decreasing type; receiving the input and output signals to reset the filter signal; and converting the filter signal into the output signal having a pulse type. According to the reset operation, the filter signal is reset into a high level when the input and output signals are high levels, and the filter signal is reset into a low level when the input and output signals are low levels. When the input and output signals have mutually different levels, the filter signal is not reset.