Hysteresis characteristic setting device and hysteresis characteristic setting method

A device for setting a hysteresis characteristic with respect to an input signal, said device comprising:

• a pre-processing section for reducing a noise of said input signal;
• a voltage dividing section for dividing a voltage of said pre-processed input signal into a first signal and a second signal;
• a characteristic setting section including
• a first comparator for comparing said first signal with a predetermined threshold, and
• a second comparator for comparing said second signal with said predetermined threshold, for setting a hysteresis characteristic based on results of said first comparator and second comparator;
• wherein said voltage dividing section divides said pre-processed input signal so that a voltage of said second signal is lower than a voltage of said first signal, and
• wherein said setting section sets a hysteresis characteristic in such manner that:
• when both of said first signal and said second signal are equal to or higher than said predetermined threshold, said setting section outputs a high level signal;
• when both of said first signal and said second signal are lower than said predetermined threshold, said setting section outputs a low level signal;
• and
• when said first signal is equal to or higher than said predetermined threshold and said second signal is lower than said predetermined threshold, said setting section outputs a same level signal as an earlier output signal.

A method for setting a hysteresis characteristic in respect to an input signal, said method comprising:

• pre-processing for reducing a noise of said input signal;
• voltage dividing for dividing said pre-processed input signal into a first signal and a second signal, which is lower than said first signal;
• first comparing for comparing said first signal with a predetermined threshold;
• second comparing for comparing said second signal with said predetermined threshold;
• and
• characteristic setting for setting a hysteresis characteristic based on said first comparing and second comparing;
• wherein said characteristic setting comprises:
• said hysteresis characteristic of said input signal is defined as a high level of output signal in a case that said first signal is equal to or higher than said predetermined signal in a result of said first comparing and said second signal is equal to or higher than said predetermined threshold in a result of said second comparing,
• said hysteresis characteristic of said input signal is defined as a low level of output signal in a case that said first signal is lower than said predetermined threshold in the result of said first comparing and said second signal is lower than said predetermined threshold in the result of said second comparing, and
• said hysteresis characteristic of said input signal is defined as the same as an earlier output signal in a case that said first signal is equal to or higher than said predetermined threshold in the result of said first comparing and said second signal is lower than said predetermined threshold in the result of said second comparing.

A device for setting a hysteresis characteristic with respect to an input signal, said device comprising:

• a voltage divider receiving said input signal and outputting said input signal as a first voltage and outputting a second voltage that is less than said first voltage;
• and
• a computer that:
• determines a high level exists when said first voltage and said second voltage are both equal to or higher than a predetermined threshold,
• determines a low level exists when said first voltage and said second voltage are both lower than said predetermined threshold, and
• determines a same level as an earlier determination exists when said first voltage is equal to or higher than said predetermined threshold and said second voltage is lower than said predetermined threshold.

A method for setting a hysteresis characteristic with respect to an input signal, the method comprising:

• dividing said input signal, using a voltage divider circuit, into a first signal and a second signal;
• determining that a high level exists when said first signal and said second signal are equal to or higher than said predetermined threshold;
• determining that a low level exists when said first signal and said second signal are less than said predetermined threshold;
• and
• determining that a same level as an earlier determination exists when said first voltage is equal to or higher than said predetermined threshold and said second voltage is lower than said predetermined threshold.