High accuracy digital to analog resolver converter
AssigneeThe Singer Company
InventorsWilliam Joseph Glennon, Alfred Douglas Gronner, David Julian Simon
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Abstract
A high accuracy digital to analog resolver converter uses a read only memory device (PROM) programmed to generate a digital signal proportional to the inherent systematic error of a digital to analog resolver converter. This signal is then converted to analog form by conventional means and combined with the primary signal in analog form thereby substantially increasing the accuracy of a digital to analog resolver converter.
Claims14
A method for enhancing the accuracy of a digital to analog resolver converter of the type which first converts a primary n bit digital input to a corresponding analog value and then converts the analog value to outputs for resolver use having a known variable error for each desired angle comprising the steps:
- a. storing in a read only memory device having a y bit output the known variable error for each desired angle;
- b. addressing the read only memory device with the bits of the primary n bit digital input representing the magnitude of each desired angle;
- c. converting the output of the read only memory device to analog form with a digital to analog converter;
- d. summing the variable error output converted to analog form and analog value of the primary digital input resulting in a corrected signal;
- and
- e. using said corrected signal to develop the outputs for resolver use corresponding to each desired angle.
A device for enhancing the accuracy of a digital to analog resolver converter of the type in which a first digital to analog converter converts a primary n bit digital input to a corresponding analog value and then converts the analog value to resolver outputs having a known variable error for each desired angle which comprises:
- a. a read only memory device having its address inputs coupled to the bits of the primary n bit digital input representing the magnitude of each desired angle and having been programmed with the known variable error for each desired angle and having a y bit output containing the known variable error for each angle;
- b. a second digital to analog converter having its inputs coupled to the outputs of said read only memory device and having as its output the variable error for each desired angle in analog form;
- c. means, having as inputs the outputs of said first and second digital to analog converters, for summing the known variable error for each desired angle and the analog value of the primary digital input which results in a corrected signal said signal then being used in said converter for generating said outputs for resolver use corresponding to each desired angle.
In a digital to analog resolver converter comprising:
- a. a first digital to analog converter having as inputs a primary n bit digital signal;
- and
- b. means to convert the output of said first digital to analog converter to resolver outputs having a known variable error for each angle, the improvement comprising:
- c. a read only memory device having its address inputs coupled to the bits of the primary n bits digital input representing the magnitude of each desired angle and having been programmed with the known variable error for each desired angle and having a y bit output containing the known variable error for each angle;
- d. a second digital to analog converter having its inputs coupled to the outputs of said read only memory device and having as its output the variable error for each desired angle in analog form;
- e. means, having as inputs the outputs of said first and second digital to analog converters, for summing the known variable error for each desired angle and the analog value of the primary digital input which results in a corrected signal which signal is provided to said means to convert.
Dependencies are inferred from the claim text.