Editing Hadamard matrix (section)

==Practical applications==
* [[Olivia MFSK]] – an amateur-radio digital protocol designed to work in difficult (low signal-to-noise ratio plus multipath propagation) conditions on shortwave bands.
* [[Balanced repeated replication]] (BRR) – a technique used by statisticians to estimate the [[variance]] of a [[statistical estimator]].
* [[Coded aperture]] spectrometry – an instrument for measuring the [[spectrum of light]]. The mask element used in coded aperture spectrometers is often a variant of a Hadamard matrix.
* Feedback delay networks – Digital reverberation devices which use Hadamard matrices to blend sample values
* [[Plackett–Burman design]] of experiments for investigating the dependence of some measured quantity on a number of [[independent variable]]s.
* [[Robust parameter design (RPD)|Robust parameter designs]] for investigating noise factor impacts on responses
* [[Compressed sensing]] for [[signal processing]] and under-determined linear systems (inverse problems)
* [[Quantum gate#Hadamard gate|Quantum Hadamard gate]] for [[quantum computing]] and the [[Hadamard transform]] for quantum algorithms.