Digital transmitter with variable resolution as a function of speed
First Claim
1. A transmitter for providing an output signal as a function of a sensed parameter, the transmitter comprising:
- sensing means for providing an analog signal which is a function of the sensed parameter;
integrating analog-to-digital (A/D) converter means for producing a digital signal which is a quasi-continuous, non-rezeroed integrated average of the analog signal;
means for digitally filtering the digital signal to provide a filtered digital signal; and
means for providing the output signal as a function of the filtered digital signal.
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Abstract
A digital transmitter with an analog sensor uses an integrating analog-to-digital (A/D) converter to digitize the analog signal from the sensor. The A/D converter produces a digital output which is a continuous, non-rezeroed integrated average of the analog signal, so that the integrated average of the digital output over time does not contain inherent quantization errors. A microcomputer system digitally filters the signal from the A/D converter, and then uses the digitally filtered signal to produce the transmitter output signal. By varying the response time of the digital filter, the response time and resolution of the transmitter can be varied.
37 Citations
9 Claims
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1. A transmitter for providing an output signal as a function of a sensed parameter, the transmitter comprising:
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sensing means for providing an analog signal which is a function of the sensed parameter; integrating analog-to-digital (A/D) converter means for producing a digital signal which is a quasi-continuous, non-rezeroed integrated average of the analog signal; means for digitally filtering the digital signal to provide a filtered digital signal; and means for providing the output signal as a function of the filtered digital signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification