Home / Publications / E-library page
Only AES members and Institutional Journal Subscribers can download
A fast Fourier transform (FFT) spectrum analyzer, especially a dual-channel device, can furnish increased measurement capabilities if its data can be sent to a microcomputer for postprocessing. Some of the additional capabilities that the authors have achieved are illustrated, their usefulness in audio measurement is discussed, and their theoretical basis and the means by which they are computed are outlined. The FFT analyzer, in addition to acquiring the data, functions essentially as a rapid Fourier transform calculator and flexible display unit, while the data are suitably reconfigured in the microcomputer and shuttled forward and backward between them. The computation is shown of 1) the analytic signal and its envelope (that is, the "energy-time curve"), 2) the minimum-phase and excess-phase portions of a system`s phase response, 3) constant relative bandwidth smoothing (such as one-third-octave smoothing) of FFT spectral data, and 4) the cumulative spectral decay plot (that is, the "waterfall" plot of power versus frequency versus time).
Author (s): Lipshitz, Stanley P.; Scott, Tony C.; Vanderkooy, John
Affiliation:
University of Waterloo, Waterloo, Ont., N2L 3G! Canada
(See document for exact affiliation information.)
Publication Date:
1985-09-06
Import into BibTeX
Permalink: https://aes2.org/publications/elibrary-page/?id=4433
(1734KB)
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member Join the AES. If you need to check your member status, login to the Member Portal.
Lipshitz, Stanley P.; Scott, Tony C.; Vanderkooy, John; 1985; Increasing the Audio Measurement Capability of FFT Analyzers by Microcomputer Postprocessing [PDF]; University of Waterloo, Waterloo, Ont., N2L 3G! Canada; Paper ; Available from: https://aes2.org/publications/elibrary-page/?id=4433
Lipshitz, Stanley P.; Scott, Tony C.; Vanderkooy, John; Increasing the Audio Measurement Capability of FFT Analyzers by Microcomputer Postprocessing [PDF]; University of Waterloo, Waterloo, Ont., N2L 3G! Canada; Paper ; 1985 Available: https://aes2.org/publications/elibrary-page/?id=4433
@article{lipshitz1985increasing,
author={lipshitz stanley p. and scott tony c. and vanderkooy john},
journal={journal of the audio engineering society},
title={increasing the audio measurement capability of fft analyzers by microcomputer postprocessing},
year={1985},
volume={33},
issue={9},
pages={626-648},
month={september},}