Research article summary:

Spectral and temporal cues to pitch in noise-excited vocoder simulations of continuous-interleaved-sampling cochlear implants.

Abstract Extract:
Four-band and single-band noise-excited vocoders were used in acoustic simulations to investigate spectral and temporal cues to melodic pitch in the output of a cochlear implant speech processor. Noise carriers were modulated by amplitude envelopes ... (Full abstract text below)

Published 2002Nov in Journal: J Acoust Soc Am (Language : eng)

Full Pubmed Extract

This information was retrieved, real-time, on your behalf from the public area of the Pubmed website:

1. J Acoust Soc Am. 2002 Nov;112(5 Pt 1):2155-64

Spectral and temporal cues to pitch in noise-excited vocoder simulations of continuous-interleaved-sampling cochlear implants.

Green T, Faulkner A, Rosen S

Department of Phonetics and Linguistics, University College London, United Kingdom. tim@phon.ucl.ac.uk

Four-band and single-band noise-excited vocoders were used in acoustic simulations to investigate spectral and temporal cues to melodic pitch in the output of a cochlear implant speech processor. Noise carriers were modulated by amplitude envelopes extracted by half-wave rectification and low-pass filtering at 32 or 400 Hz. The four-band, but not the single-band processors, may preserve spectral correlates of fundamental frequency (F0). Envelope smoothing at 400 Hz preserves temporal correlates of F0, which are eliminated with 32-Hz smoothing. Inputs to the processors were sawtooth frequency glides, in which spectral variation is completely determined by F0, or synthetic diphthongal vowel glides, whose spectral shape is dominated by varying formant resonances. Normal listeners labeled the direction of pitch movement of the processed stimuli. For processed sawtooth waves, purely temporal cues led to decreasing performance with increasing F0. With purely spectral cues, performance was above chance despite the limited spectral resolution of the processors. For processed diphthongs, performance with purely spectral cues was at chance, showing that spectral envelope changes due to formant movement obscured spectral cues to F0. Performance with temporal cues was poorer for diphthongs than for sawtooths, with very limited discrimination at higher F0. These data suggest that, for speech signals through a typical cochlear implant processor, spectral cues to pitch are likely to have limited utility, while temporal envelope cues may be useful only at low F0.

PMID : 12430827 [PubMed - Indexed for MEDLINE]

This information is obtained from the National Library of Medicine (NLM). Abstract text and other information may be subject to copyright. Type "NLM copyright" into Google for more information.

Full Author Information

First Name	LastName	Initials
Tim	Green	T
Andrew	Faulkner	A
Stuart	Rosen	S

Affiliation: Department of Phonetics and Linguistics, University College London, United Kingdom. tim@phon.ucl.ac.uk

3rd Party provider links

Click the links below to go to related 3rd party information:

MESH categories and related page links

This article was linked to the MESH categories shown on the left below. The links on the right are related Memletics pages.

Links for this article

For links to places where you can get the full text of this article see links. Note there may be a subscription or fee required for access to the full text.

New! Using similar technology to this site, we have launched find-health-articles.com, targeting over 1 million health research article abstracts.

Here are some articles related to this one (by title keywords):

Auditory temporal gap detection for noise markers with partially overlapping and non-overlapping spectra.

The attention filter for tones in noise has the same shape and effective bandwidth in the elderly as it has in young listeners.

Spatial attention excludes external noise at the target location.

The processing of temporal pitch and melody information in auditory cortex.

Understanding muscle coordination of the human leg with dynamical simulations.

A spectral histogram model for texton modeling and texture discrimination.

The role of spectral change detectors in temporal order judgment of tones.

The regularities of the discrete nature of multi-variability of EEG spectral patterns.

Recognition of notated melodies by possessors and nonpossessors of absolute pitch.

Processing pitch and duration in music reading: a RT-ERP study.

>>> Get more research article abstracts like these, or browse abstracts.

Keywords in this article:

above, acoustic, amplitude, band, carriers, chance, changes, cochlear, completely, correlates, cues, data, decreasing, despite, determined, diphthongal, diphthongs, direction, discrimination, dominated, eliminated, envelopes, excited, extracted, filtering, formant, four, frequency, fundamental, glides, half, higher, hz, implant, increasing, inputs, investigate, labeled, likely, limited, listeners, low, melodic, modulated, movement, noise, normal, not, obscured, only, output, pass, performance, pitch, poorer, preserve, preserves, processed, processor, processors, purely, rectification, resolution, resonances, sawtooth, sawtooths, shape, showing, signals, simulations, single, smoothing, spectral, speech, stimuli, suggest, synthetic, temporal, typical, useful, utility, variation, varying, vocoders, vowel, wave, waves, whose

Also, see our new free speed reading online course (beta version)