Delta-modulation signal processors: linear, nonlinear and mixed
OwnerDjuro Zrilicinventor
Life of this patent
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Abstract
Disclosed are nine functional circuits for the direct processing of a delta-modulated pulse stream. These circuits can be integrated separately, as standalone circuits, or integrated into a programmable, functional unit to form a system on chip (SoC). Disclosed functional units are low-power consuming, simple, reliable and inexpensive. Because of the non-positional nature of delta-sigma modulated (DSM) pulses and the averaging nature of the demodulator, disclosed circuits are tolerant to catastrophic errors, which is not the case with ordinary n-bit DSP hardware.
Claims10
FIG. 10 presents a delta-sigma (DS) modulated digital signal processor (DSP) chip which is comprised of independent inventions shown in FIGS. 1A, 2A, 3A, 4A, 5A, 6A, 7A, 8A, and 9A. These inventions can be integrated on the single integrated circuit (IC) chip as shown in FIG. 10. This DS modulated DSP chip comprises of interface unit (multiplexed sensor network);
- low-pass or band-pass DS modulator;
- and functional unit for direct processing of a low-pass or band-pass DS modulated pulse stream. The functional unit comprises of:
- digital circuit for squaring or rectifying operation of delta modulated pulse stream;
- mixed analog/digital circuit for squaring operation of delta modulated pulse stream;
- digital rectifying circuit for alternate current-to-direct current (AC-to-DC) conversion;
- multiplier of two delta modulated pulse streams with analog addition and subtraction of two signals at the input of DS modulator;
- digital multiplier of two DS modulated sequences;
- root-mean square to direct current (RMS-to-DC) converter;
- digital circuit for multiplication of DS modulated pulse streams with a constant greater or less than one;
- circuit for addition three or more DS modulated sequences;
- digital correlator circuit for correlation of two DS modulated sequences.
Dependencies are inferred from the claim text.