Coded data generation or conversion – Digital code to digital code converters – To or from particular bit symbol
Patent
1990-02-12
1991-10-01
Pellinen, A. D.
Coded data generation or conversion
Digital code to digital code converters
To or from particular bit symbol
341 52, H03M 58
Patent
active
050537695
ABSTRACT:
The digital interface divides a digital number (N.sub.o) representing the sensor reading into a most significant part (MSB) and a least significant part (LSB). The most significant part is used to determine the pulse width of a sequence of pulses and the least significant part is used to selectively modify the pulses by increasing the pulse width of selected ones of the pulses. A lookup table (54) is used to evenly distribute the lengthened pulses throughout the pulse train. The resulting waveform has a DC component representative of the original digital number which is extracted by low pass filtering. The energy in the non-DC spectral components is appreciably attenuated as compared to the spectrum of a standard pulse width modulated waveform. This makes it possible to use a filter (28) with considerably higher cutoff frequency and with considerably improved response time for a given resolution.
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Borg-Warner Automotive Inc.
Pellinen A. D.
Young Brian K.
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