Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1990-11-20
1992-05-26
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
341 76, 375 27, H03M 302
Patent
active
051172348
ABSTRACT:
A signal modulation system for converting a plural-bit digital input signal to an encoded-bit digital output signal representative of an analog signal having a variable amplitude by employing delta-sigma modulation. The signal modulation system has a quantizer which quantizes the digital input signal and outputs it as the prescribed encoded digital ouput signal, and a control circuit portion which makes the quantizing step width in the quantizer vary corresponding to a control signal indicative of the amplitude of the analog signal to be represented. The quantizing step width is determined by a selection of respective sets of threshold values and quantizing values from memory as determined by the control signal. Comparators then produce comparison results between the digital input signal and each of the threshold values in the selected set, and a selector then selects one quantizing value in the selected set of quantizing values based upon the comparison results.
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Donaldson Richard L.
Hiller William E.
Texas Instruments Incorporated
Williams Howard L.
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