On the use of symmetrized dot patterns for the visual characterization of speech waveforms and other sampled data

Pickover, Clifford A.

doi:10.1121/1.393918

Cited by 61 publications

(23 citation statements)

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“…Among the methods available for the characterization of complicated mathematical and physical phenomena, computers with graphics are emerging as an important tool (see [lo]- [13], [16], [17], [29], and [30]. Computers with graphics have played a critical role in studying iterated sets and in helping mathematicians form the intuitions needed to prove new theorems about convergence of sequences of points in the complex plane [4].…”

Section: Discussionmentioning

confidence: 99%

Pattern formation and chaos in networks

Pickover

1988

Commun. ACM

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Section: Discussionmentioning

confidence: 99%

Pattern formation and chaos in networks

Pickover

1988

Commun. ACM

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“…The last part of the present investigation utilized the 'symmetrized dot pattern' (SDP) technique [26] to conduct a qualitative evaluation of the differences in noise emitted from the different impellers as perceived by the human ear.…”

Section: Symmetrized Dot Pattern Techniquementioning

confidence: 99%

Detection of aerodynamic noise sources in low-speed axial fans with tip end-plates

Bianchi

Corsini

Rispoli

et al. 2009

Proceedings of the Institution of Mechanical Engineers, Part C:

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This article reports on the use of modified blade-tip configurations designed with a view to passive noise control in low-speed fans for compact cooling units. The addition of end-plates at the tip of a datum fan blade is shown to have a positive influence on the fan's rotor-only aero-acoustic signature. The aerodynamic effects of the modified blade tips are experimentally tested in a fully ducted configuration in the near field and far field using a correlation technique. The nature of the flow mechanisms in the blade-tip region are correlated with the specific end-plate design features and their role in the creation of overall acoustic emissions is clarified. The noise emitted by the fans is analysed in terms of coherent vortex structures, tip-leakage flow, and noise sources. Differences in human perception of the noise emitted to the environment are also investigated using a dot-pattern visualization. The study concludes that the modified tip configurations have a marked effect on tip-leakage vortex formation by altering the near-wall fluid paths on blade surfaces. The reduction in rotor noise emission is correlated with the control of tip-leakage flows produced by the tip end-plates

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“…The human auditory system aids thorough technical experimentation and evaluation of methods and settings. The auditory feedback can further be enhanced visually by looking at graphical representations (e.g., spectrograms or speech flakes [13]) of a resynthesized signal, together yielding a toolbox of multi-sensory perceptual analysis instruments. Analysis by perception thus works as a guide in the large, unstructured hypothesis space of speech processing methods.…”

Section: Analysis By Perceptionmentioning

confidence: 99%