Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating
Patent
1996-03-20
1998-11-24
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
327 18, 327 37, H03K 501
Patent
active
058413014
ABSTRACT:
A waveform shaping apparatus includes a comparing device for comparing a sensor output signal with a threshold voltage to convert the sensor output signal into a waveform shaped signal. The comparing device outputs the waveform shaped signal. The waveform shaping apparatus also includes a frequency-to-voltage converting device for generating the threshold voltage in response to a frequency of the output signal from the comparing device. In the frequency-to-voltage converting device, a clock signal is generated in response to the output signal from the comparing device. The clock signal has a period proportional to a period of the output signal from the comparing device. A counting device is operative for counting pulses in the clock signal generated by the clock signal generating device for every given period, and outputting a signal representing a counted pulse number depending on the frequency of the output signal from the comparing device. A D/A converting device is operative for converting the output signal from the counting device into a voltage signal which depends on the counted pulse number. The threshold voltage is generated in response to the voltage signal generated by the D/A converting device.
REFERENCES:
patent: 5019936 (1991-05-01), Zylstra et al.
patent: 5357147 (1994-10-01), Ina et al.
patent: 5396109 (1995-03-01), Oshiba
patent: 5406132 (1995-04-01), Housako
patent: 5576658 (1996-11-01), Hushimi et al.
Harada Takuya
Horie Masakiyo
Callahan Timothy P.
Nippondenso Co. Ltd.
Nu Ton My-Trang
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