Direct construction of nonuniform block orthogonal transforms

Takayuki Nagai, Shigeki Obata, Masaaki Ikehara

Research output: Contribution to journalArticle

Abstract

The block orthogonal transforms (BOTS) are widely used as a basic technology for processing of voice and video signals. Many BOTs are known at present. However, most of them are uniform BOTs in which the signals are divided into equally spaced frequency bands such as DCT. In general, if the frequency range is nonuniformly divided, there is a possibility that the signal can be processed more efficiently than the case of uniform spacing. Among the methods of configuration of the nonuniform BOT (NUBOT) in which the frequency band is divided into nonuniform spacing, the easiest realization is to connect uniformly spaced BOTs (filter banks) in a tree fashion. In such a tree configuration, the characteristics of each fillet cannot be controlled directly. Therefore, an optimum NUBOT in terms of coding efficiency cannot be realized. In this paper, a method is proposed to realize an optimum NUBOT by direct configuration without a tree configuration.

Original languageEnglish
Pages (from-to)21-29
Number of pages9
JournalElectronics and Communications in Japan, Part III: Fundamental Electronic Science (English translation of Denshi Tsushin Gakkai Ronbunshi)
Volume84
Issue number4
Publication statusPublished - 2001

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Frequency bands
Filter banks
Processing

Keywords

  • Block orthogonal transform
  • Direct configuration
  • Nonuniform division

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications

Cite this

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abstract = "The block orthogonal transforms (BOTS) are widely used as a basic technology for processing of voice and video signals. Many BOTs are known at present. However, most of them are uniform BOTs in which the signals are divided into equally spaced frequency bands such as DCT. In general, if the frequency range is nonuniformly divided, there is a possibility that the signal can be processed more efficiently than the case of uniform spacing. Among the methods of configuration of the nonuniform BOT (NUBOT) in which the frequency band is divided into nonuniform spacing, the easiest realization is to connect uniformly spaced BOTs (filter banks) in a tree fashion. In such a tree configuration, the characteristics of each fillet cannot be controlled directly. Therefore, an optimum NUBOT in terms of coding efficiency cannot be realized. In this paper, a method is proposed to realize an optimum NUBOT by direct configuration without a tree configuration.",
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AU - Nagai, Takayuki

AU - Obata, Shigeki

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AB - The block orthogonal transforms (BOTS) are widely used as a basic technology for processing of voice and video signals. Many BOTs are known at present. However, most of them are uniform BOTs in which the signals are divided into equally spaced frequency bands such as DCT. In general, if the frequency range is nonuniformly divided, there is a possibility that the signal can be processed more efficiently than the case of uniform spacing. Among the methods of configuration of the nonuniform BOT (NUBOT) in which the frequency band is divided into nonuniform spacing, the easiest realization is to connect uniformly spaced BOTs (filter banks) in a tree fashion. In such a tree configuration, the characteristics of each fillet cannot be controlled directly. Therefore, an optimum NUBOT in terms of coding efficiency cannot be realized. In this paper, a method is proposed to realize an optimum NUBOT by direct configuration without a tree configuration.

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