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A discrete Hartley transform (DHT) is a Fourier-related transform of discrete, periodic data similar to the discrete Fourier transform (DFT), with analogous applications in signal processing and related fields. Its main distinction from the DFT is that it transforms real inputs to real outputs, with no intrinsic involvement of complex numbers. Just as the DFT is the discrete analogue of the continuous Fourier transform (FT), the DHT is the discrete analogue of the continuous Hartley transform (HT), introduced by Ralph V. L. Hartley in 1942.

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  • Discrete Hartley transform (en)
  • Transformada discreta de Hartley (pt)
  • Дискретное преобразование Хартли (ru)
  • 離散哈特利轉換 (zh)
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  • Дискретное преобразование Хартли (сокращённо ДПХ) — разновидность дискретного ортогонального тригонометрического преобразования. Во многих случаях может служить заменой дискретного преобразования Фурье. (ru)
  • 離散哈特利轉換(DHT)是一種與傅立葉變換相關之轉換,類似於離散傅立葉變換(DFT),與傅立葉變換在信號處理及其他相關領域中有類似的應用。與離散傅立葉變換最主要的差異在於哈特利轉換對於實數的輸入,有實數的輸出,並不會牽涉到複數的運算。如同離散傅立葉變換是連續域傅立葉變換的離散類比,離散哈特利轉換亦為連續域哈特利轉換的類比。連續域哈特利轉換於1942年由R. V. Hartley提出。離散哈特利轉換則在1983年由 R. N. Bracewell所提出,由於有相當多類似於快速傅立葉變換(FFT)的快速演算法被提出,於是在一般情況下當欲處理之資料為實數時,成為較傅立葉變換有效率之工具。然而,亦有人認為,特別針對實數輸入或輸出所設計之快速傅立葉變換演算法可以達到較相對應之哈特利轉換演算法而少的運算量(見下文)。 (zh)
  • A discrete Hartley transform (DHT) is a Fourier-related transform of discrete, periodic data similar to the discrete Fourier transform (DFT), with analogous applications in signal processing and related fields. Its main distinction from the DFT is that it transforms real inputs to real outputs, with no intrinsic involvement of complex numbers. Just as the DFT is the discrete analogue of the continuous Fourier transform (FT), the DHT is the discrete analogue of the continuous Hartley transform (HT), introduced by Ralph V. L. Hartley in 1942. (en)
  • A transformada discreta de Hartley (DHT) é a versão da transformada de Hartley aplicável a sequências de valores, da mesma forma que a transformada discreta de Fourier (DFT) é a versão da transformada de Fourier para valores discretos periódicos. A DHT é, por conseguinte, uma transformada integral bastante relacionada às transformadas citadas e encontra aplicações similares. A principal vantagem da DHT sobre a DFT é que ela transforma uma sequência de valores reais em outra sequência de valores reais, evitando a necessidade de se trabalhar com números complexos. (pt)
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  • A discrete Hartley transform (DHT) is a Fourier-related transform of discrete, periodic data similar to the discrete Fourier transform (DFT), with analogous applications in signal processing and related fields. Its main distinction from the DFT is that it transforms real inputs to real outputs, with no intrinsic involvement of complex numbers. Just as the DFT is the discrete analogue of the continuous Fourier transform (FT), the DHT is the discrete analogue of the continuous Hartley transform (HT), introduced by Ralph V. L. Hartley in 1942. Because there are fast algorithms for the DHT analogous to the fast Fourier transform (FFT), the DHT was originally proposed by Ronald N. Bracewell in 1983 as a more efficient computational tool in the common case where the data are purely real. It was subsequently argued, however, that specialized FFT algorithms for real inputs or outputs can ordinarily be found with slightly fewer operations than any corresponding algorithm for the DHT. (en)
  • A transformada discreta de Hartley (DHT) é a versão da transformada de Hartley aplicável a sequências de valores, da mesma forma que a transformada discreta de Fourier (DFT) é a versão da transformada de Fourier para valores discretos periódicos. A DHT é, por conseguinte, uma transformada integral bastante relacionada às transformadas citadas e encontra aplicações similares. A principal vantagem da DHT sobre a DFT é que ela transforma uma sequência de valores reais em outra sequência de valores reais, evitando a necessidade de se trabalhar com números complexos. Como existe um algoritmo bastante eficiente para cálculo da DHT, a transformada rápida de Hartley (FHT), a DHT foi proposta originalmente por em 1983 como uma ferramenta mais eficiente para o tratamento dos casos em que os dados de entrada são puramente reais e periódicos, casos esses muito comuns. Posteriormente, no entanto, descobriu-se que era possível encontrar algoritmos baseados na transformada rápida de Fourier (FFT) um pouco mais eficientes (ver ), o que limitou o uso da DHT. Sequências de valores aparecem quando funções contínuas são amostradas a determinados intervalos, situação frequente em análise harmônica, estatística e campos relacionados. (pt)
  • Дискретное преобразование Хартли (сокращённо ДПХ) — разновидность дискретного ортогонального тригонометрического преобразования. Во многих случаях может служить заменой дискретного преобразования Фурье. (ru)
  • 離散哈特利轉換(DHT)是一種與傅立葉變換相關之轉換,類似於離散傅立葉變換(DFT),與傅立葉變換在信號處理及其他相關領域中有類似的應用。與離散傅立葉變換最主要的差異在於哈特利轉換對於實數的輸入,有實數的輸出,並不會牽涉到複數的運算。如同離散傅立葉變換是連續域傅立葉變換的離散類比,離散哈特利轉換亦為連續域哈特利轉換的類比。連續域哈特利轉換於1942年由R. V. Hartley提出。離散哈特利轉換則在1983年由 R. N. Bracewell所提出,由於有相當多類似於快速傅立葉變換(FFT)的快速演算法被提出,於是在一般情況下當欲處理之資料為實數時,成為較傅立葉變換有效率之工具。然而,亦有人認為,特別針對實數輸入或輸出所設計之快速傅立葉變換演算法可以達到較相對應之哈特利轉換演算法而少的運算量(見下文)。 (zh)
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