A New Multiplier-Free Structure for DFT Based on Delta Modulation

Abstract

A new implementation of the DFT based on delta modulation (DM) is proposed. It is different from the conventional implementation based on PCM. The hardware structure of the method is constructed without A/D converter and multiplier, so it is simpler and of lower cost. Its SNR can approach that of the conventional one, such as FFT. Computer simulations demonstrate that for deterministic signals, results obtained agree well with theoretical analyses, for band-limited Gaussian signals; if step size is suitably selected, results similar to the conventional DFT can still be obtained. Because of the limitation of the working speed of the device, this method will be suitable for processing speech and seismic signals. Finally, the hardware structure which simply consists of a ROM, an adder and some other auxiliary circuits is given.

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Document Details

Document Type
Technical Report
Publication Date
Aug 29, 1992
Accession Number
ADA255927

Entities

People

  • Huang Shunji
  • Siang Jingcheng
  • Tang Kaijun

Organizations

  • National Air and Space Intelligence Center

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Coding
  • Coefficients
  • Computer Programming
  • Computer Simulations
  • Computers
  • Delta Modulation
  • Digital Signal Processing
  • Engineering
  • Equations
  • Errors
  • Modulation
  • Modulators
  • Signal Processing
  • Simulations
  • Spectrum Analysis
  • Statistical Analysis
  • White Noise

Fields of Study

  • Engineering

Readers

  • Approximation Theory.
  • Computer Programming and Software Development.
  • Radio communications and signal processing.