Effects of envelope bandwidth on the intelligibility of sine- and noise-vocoded speech.

Pamela Souza*, Stuart Rosen

*Corresponding author for this work

Research output: Contribution to journalArticle

66 Scopus citations

Abstract

The choice of processing parameters for vocoded signals may have an important effect on the availability of various auditory features. Experiment 1 varied envelope cutoff frequency (30 and 300 Hz), carrier type (sine and noise), and number of bands (2-5) for vocoded speech presented to normal-hearing listeners. Performance was better with a high cutoff for sine-vocoding, with no effect of cutoff for noise-vocoding. With a low cutoff, performance was better for noise-vocoding than for sine-vocoding. With a high cutoff, performance was better for sine-vocoding. Experiment 2 measured perceptibility of cues to voice pitch variations. A noise carrier combined with a high cutoff allowed intonation to be perceived to some degree but performance was best in high-cutoff sine conditions. A low cutoff led to poorest performance, regardless of carrier. Experiment 3 tested the relative contributions of co-modulation across bands and spectral density to improved performance with a sine carrier and high cutoff. Co-modulation across bands had no effect so it appears that sidebands providing a denser spectrum improved performance. These results indicate that carrier type in combination with envelope cutoff can alter the available cues in vocoded speech, factors which must be considered in interpreting results with vocoded signals.

Original languageEnglish (US)
Pages (from-to)792-805
Number of pages14
JournalThe Journal of the Acoustical Society of America
Volume126
Issue number2
DOIs
StatePublished - Aug 2009

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

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