# Hartley transform

> English word · Noun

## Definitions
1. An integral transform closely related to the Fourier transform, but which transforms real-valued functions to real-valued functions.

## Etymology
It was proposed as an alternative to the Fourier transform in 1942 by American engineer Ralph Hartley.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/hartley-transform