Analog signal processing system
First Claim
Patent Images
1. An analog signal processing system comprising:
- a comparator receiving an input analog signal as one input thereof;
a processor receiving the output of said comparator and having a digital output and a control signal output, said processor performing a first analog/digital conversion operation and a second digital operation during first and second parts of each of successive operating cycles;
a digital/analog converter for converting the digital output of said processor to an output analog signal,circuit means feeding said output analog signal as a second input to said comparator; and
an analog signal sample and hold circuit receiving said output analog signal and responsive to a control signal from said processor to sample said output analog signal.
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Abstract
Computations are performed on the digital representation of an analog signal in a digital processor. The output of the processor is applied through a digital/analog converter to a sample and hold circuit. The analog signal is applied to the processor through a comparator which receives at a second input the output of the digital/analog converter. In a mode other than the computation mode the processor controls an analog/digital conversion by means of a loop including the processor, the digital/analog converter, and the comparator.
20 Citations
10 Claims
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1. An analog signal processing system comprising:
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a comparator receiving an input analog signal as one input thereof; a processor receiving the output of said comparator and having a digital output and a control signal output, said processor performing a first analog/digital conversion operation and a second digital operation during first and second parts of each of successive operating cycles; a digital/analog converter for converting the digital output of said processor to an output analog signal, circuit means feeding said output analog signal as a second input to said comparator; and an analog signal sample and hold circuit receiving said output analog signal and responsive to a control signal from said processor to sample said output analog signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. In an analog signal processing system comprising a comparator, a processor, and a digital/analog converter, the method of making digital computations with the digital representation of an input analog signal applied to the comparator input and of supply an output analog signal, said method comprising the steps of:
1. converting said input analog signal to a digital signal by means of the following sub-steps; a. applying a predetermined digital signal from said digital processor to said digital/analog converter, b. applying the output analog signal from the digital/analog converter to an input to the comparator; c. detecting the comparator output, and varying the digital representation of the input analog signal and the predetermined digital input to the digital/analog converter in accordance with the comparator output; d. continuing steps (b) and (c) until a predetermined resolution in the digital representation of the analog input is reached;
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10. performing computations in said processor with the digital representation of the analog input;
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3. applying a digital signal resulting from said computations to said digital/analog converter and sampling the output analog signal from the digital/analog converter by an analog signal sample and hold circuit.
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Specification