US 9,871,649 B2Granted

Real time subsample time resolution signal alignment in time domain

AssigneeNational Instruments Corporation

InventorsAditya Chopra, Sean P. Ferguson

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Abstract

System and method for subsample time resolution signal alignment. First and second signals may be aligned by iteratively performing the following until a termination condition is met: current samples of the first and second signals may be acquired, a delayed copy of the current samples of the first signal may be generated and subtracted from the current samples of the first signal to generate a third signal, a delayed copy of the current samples of the second signal may be generated with a current subsample delay and subtracted from the current samples of the first signal to generate a fourth signal, and an alignment error may be generated based on the third and fourth signals and the current subsample may be delay adjusted accordingly. The iteratively adjusting may generate a subsample resolution delay aligning the second signal to the first signal. Subsequent samples the first signal and the second signal may be aligned and output per the subsample resolution delay.

Claims19

Dependent claims

A system, comprising:

an input;
a functional unit, coupled to the input;
and
an output, coupled to the functional unit;
wherein the functional unit is configured to:
a) acquire, via the input, a current set of samples of a first signal and a second signal;
b) generate a delayed copy of the current set of samples of the first signal using a first delay;
c) subtract the delayed copy of the current set of samples of the first signal from the current set of samples of the first signal, thereby generating a third signal;
d) generate a delayed copy of the current set of samples of the second signal using a second delay, wherein the second delay has a current subsample resolution time duration;
e) subtract the delayed copy of the current set of samples of the second signal from the current set of samples of the first signal, thereby generating a fourth signal;
f) generate an error in alignment of the first and second signals based on a product of the third and fourth signals;
and
g) adjust the current subsample resolution time duration based on the error in alignment;
perform a)-g) one or more times in an iterative manner, wherein iteratively adjusting the current subsample resolution time duration generates a subsample resolution delay that aligns the second signal to the first signal;
and
output, via the output, subsequent sets of samples of the first signal and the second signal in accordance with the subsample resolution delay, wherein the subsequent sets of samples of the second signal are aligned with the subsequent sets of samples of the first signal.

13 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/194,800Filed 28 Jun 2016 · us provisional application
Priority: 29 Jun 2015
Published: US 2016/0380756 A129 Dec 2016
Granted: 16 Jan 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

H04L 7/02
Arrangements for synchronising receiver with transmitter: speed or phase control by the received code signals, the signals containing no special…
G06F 9/44
Using stored programs, i.e. using an internal store of processing equipment to receive or retain programs: arrangements for executing specific…
G06F 13/28
For access to input/output bus: using burst mode transfer, e.g. direct memory access DMA, cycle steal
G06F 30/33
Circuit design at the digital level: design verification, e.g. functional simulation or model checking