A Comparison between Horizontal and Vertical Interchannel Decorrelation

Christopher Gribben, Hyunkook Lee

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The perceptual effects of interchannel decorrelation on perceived image spread have been investigated subjectively in both horizontal and vertical stereophonic reproductions, looking specifically at the frequency dependency of decorrelation. Fourteen and thirteen subjects graded the horizontal and vertical image spreads of a pink noise sample, respectively. The pink noise signal had been decorrelated by a complementary comb-filter decorrelation algorithm, varying the frequency-band, time-delay and decorrelation factor for each sample. Results generally indicated that interchannel decorrelation had a significant effect on auditory image spread both horizontally and vertically, with spread increasing as correlation decreases. However, it was found that the effect of vertical decorrelation was less effective than that of horizontal decorrelation. The results also suggest that the decorrelation effect was frequency-dependent; changes in horizontal image spread were more apparent in the high frequency band, whereas those in vertical image spread were in the low band. Furthermore, objective analysis suggests that the perception of vertical image spread for the low and middle frequency bands could be associated with a floor reflection; whereas for the high band, the results appear to be related to spectral notches in the ear input signals.
Original languageEnglish
Article number1202
Number of pages21
JournalApplied Sciences
Volume7
Issue number11
DOIs
Publication statusPublished - 22 Nov 2017

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Frequency bands
Comb filters
Time delay
stereophonics
ear
notches
time lag
low frequencies
filters

Cite this

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title = "A Comparison between Horizontal and Vertical Interchannel Decorrelation",
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A Comparison between Horizontal and Vertical Interchannel Decorrelation. / Gribben, Christopher; Lee, Hyunkook.

In: Applied Sciences, Vol. 7, No. 11, 1202, 22.11.2017.

Research output: Contribution to journalArticle

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T1 - A Comparison between Horizontal and Vertical Interchannel Decorrelation

AU - Gribben, Christopher

AU - Lee, Hyunkook

PY - 2017/11/22

Y1 - 2017/11/22

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AB - The perceptual effects of interchannel decorrelation on perceived image spread have been investigated subjectively in both horizontal and vertical stereophonic reproductions, looking specifically at the frequency dependency of decorrelation. Fourteen and thirteen subjects graded the horizontal and vertical image spreads of a pink noise sample, respectively. The pink noise signal had been decorrelated by a complementary comb-filter decorrelation algorithm, varying the frequency-band, time-delay and decorrelation factor for each sample. Results generally indicated that interchannel decorrelation had a significant effect on auditory image spread both horizontally and vertically, with spread increasing as correlation decreases. However, it was found that the effect of vertical decorrelation was less effective than that of horizontal decorrelation. The results also suggest that the decorrelation effect was frequency-dependent; changes in horizontal image spread were more apparent in the high frequency band, whereas those in vertical image spread were in the low band. Furthermore, objective analysis suggests that the perception of vertical image spread for the low and middle frequency bands could be associated with a floor reflection; whereas for the high band, the results appear to be related to spectral notches in the ear input signals.

KW - 3D audio

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KW - vertical image spread

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