Carlos Jurado

Carlos Jurado
Universidad de Las Américas | UDLA · Facultad de Ingeniería

Acoustic Engineer, MSc. PhD.

About

24
Publications
6,902
Reads
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143
Citations
Additional affiliations
April 2018 - present
Universidad de Las Américas
Position
  • Professor (Associate)
April 2018 - present
Universidad de Las Américas
Position
  • Professor (Associate)
April 2017 - February 2018
University College London
Position
  • Research Associate

Publications

Publications (24)
Article
Full-text available
We investigated the effect of a biasing tone close to 5, 15, or 30 Hz on the response to higher-frequency probe tones, behaviorally, and by measuring distortion-product otoacoustic emissions (DPOAEs). The amplitude of the biasing tone was adjusted for criterion suppression of cubic DPOAE elicited by probe tones presented between 0.7 and 8 kHz, or c...
Article
Full-text available
The lower limit of pitch (LLP) perception was explored for pure tones, sinusoidally amplitude-modulated (SAM) tones with a carrier frequency of 125 Hz, and trains of 125-Hz tone pips, using an adaptive procedure to estimate the lowest repetition rate for which a tonal/humming quality was heard. The LLP was similar for the three stimulus types, aver...
Article
Full-text available
What sound quality has led to exclude infrasound from sound in the conventional hearing range? We examined whether temporal segregation of pressure pulses is a distinctive property and evaluated this perceptual limit via an adaptive psychophysical procedure for pure tones and carriers of different envelopes. Further, to examine across-domain simila...
Article
Full-text available
Many environmental sounds contain significant energy in the infrasonic and low-frequency (ISLF) ranges that have been associated with cases of annoyance and noise complaints. This study assessed the effect of sound duration on audibility and loudness of ISLF sounds. A first experiment evaluated detection thresholds for tones of 4, 16, and 32 Hz wit...
Article
Full-text available
Complaints and awareness about environmental low-frequency (LF) noise and infrasound (IS) have increased in recent years, but knowledge about perceptual mechanisms is limited. To evaluate the use of the brain’s frequency-following response (FFR) as an objective correlate of individual sensitivity to IS and LF, we recorded the FFR to monaurally pres...
Article
The loudness of two-tone complexes (TTCs) with center frequencies (fc) of 40, 63, 80, and 1000 Hz was matched with that of unmodulated tones (UTs). Frequency differences between the TTC components, corresponding to beat frequencies, fb, were 1, 2, 5, and 12 Hz. To compensate for the steep decline in hearing sensitivity below 100 Hz, prior to the lo...
Article
Full-text available
Some environmental sounds have strong amplitude fluctuations that may affect their perceived loudness and annoyance. This study assessed the effect of beat rate (fb) and center frequency (fc) on the loudness of low-frequency beating tones. The loudness of two-tone complexes (TTCs) with fc = 40, 63, 80, and 1000 Hz was matched with that of unmodulat...
Article
Full-text available
The use of airborne infrasound and other stimuli to elicit (cervical) vestibular-evoked myogenic potentials (cVEMPs) was studied to address the common proposition that infrasound may efficiently stimulate the vestibular system, an effect which may underlie the so-called wind-turbine syndrome. cVEMPs were measured for both ears of 15 normal-hearing...
Article
Full-text available
Environmental infrasound is usually accompanied by low-frequency (LF) sounds. Considering that inner hair cell transduction equals half-wave rectification, activity of low-frequency auditory nerve fibres may be indistinguishable whether elicited by LF sound that is amplitude-modulated at an infrasonic rate, or LF sound that is superimposed onto infra...
Article
Full-text available
High-resolution equal-loudness-level contours (ELCs) were measured over the frequency range 10−250 Hz using 19 normal-hearing subjects. Three levels of the 50-Hz reference sound were used, corresponding to the levels at 50 Hz of the 30-, 50-, and 70-phon standardized ELCs given in ISO-226:2003. The dynamic range of the contours generally decreased...
Presentation
Full-text available
Auditory-evoked potentials in response to direct infrasound and low-frequency stimulation are introduced. Preliminary findings and methodological aspects of the measurement are discussed.
Presentation
Full-text available
New data on low-frequency loudness perception and complementary physiological data are introduced. Physiological mechanisms and their possible influence on individual differences in sound perception are discussed.
Article
Full-text available
Below approximately 40 Hz, the cochlear travelling wave reaches the apex, and differential pressure is shunted through the helicotrema, reducing hearing sensitivity. Just above this corner frequency, a resonance feature is often observed in objectively measured middle-ear-transfer functions (METFs). This study inquires whether overall and fine stru...
Article
Full-text available
At very low frequencies, when the travelling wave reaches the apical end of the cochlea, perilymph is forced through the helicotrema. Iso-modulation curves of distortion product otoacoustic emissions (DPIMCs) reveal non-invasively the frequency-dependence of low-frequency sound transmission onto the basilar membrane, and demonstrate that this shunt...
Thesis
Full-text available
A fundamental property of the auditory system is its frequency resolving power. This allows us to process sound in such a way as to provide an effective frequency analysis of it. Understanding the properties of specific filtering units, the auditory filters, across frequency, has been essential in the development of auditory models that describe ou...
Article
Full-text available
Psychophysical tuning curves (PTCs) were measured for sinusoidal signals with frequency f(s) = 31.5, 40, 50, 63, and 80 Hz, using sinusoidal and narrowband-noise maskers. For the former, conditions were included where a pair of beating tones was added to reduce the use of cues related to beats. Estimates of each subject's middle-ear transfer functi...
Article
Full-text available
Auditory filter shapes were derived for signal frequencies (f(s)) between 50 and 1000 Hz, using the notched-noise method. The masker spectrum level (N(0)) was 50 dB (re 20 μPa). For f(s) = 63 and 50 Hz, measurements were also made with N(0) = 62 dB for the lower band. The data were fitted using a rounded-exponential filter model, with special consi...
Conference Paper
Full-text available
Noise with energy in the low-frequency range (i.e. below 200 Hz) is known to produce problems with annoyance and represents an environmental problem (Leventhall, 2004). Attempts to understand and predict problems produced by low-frequency noise require information about human frequency selectivity in the low-frequency range. However, there are few...
Conference Paper
Full-text available
A significant factor in the decrease of sensitivity to low-frequency sound is the helicotrema shunt effect. In humans, it causes a slope increase of the middle-ear transfer function (METF) from 6 dB/oct to 12 dB/oct below approximately 50 Hz [Marquardt et al., J.Acoust. Soc. Am. 121, 3628-3638 (2007)]. Recent experiments showed that the exact frequ...
Conference Paper
Full-text available
Prediction and asessment of low-frequency noise problems requires information about the auditory filter characteristics at low-frequencies. Unfortunately, data at low frequencies is scarce and practically no information exists for frequencies below 100 Hz. Extrapolation of previous results indicates the filter bandwidth would keep decreasing below...
Article
In order to evaluate loudness or audibility of complex sounds, knowledge of the auditory filter characteristics is necessary. At low frequencies, where both the threshold of hearing and dynamic range become considerably frequency dependent, care must be taken to account for this both in the psycho-acoustical model and the methodological approach. T...
Thesis
Full-text available
Exposure and effects of low frequency noises demand a better understanding of auditory filtering at low frequencies. Given that below 100 Hz, auditory filters have not been systematically studied, an effort was done in this project to better describe auditory filters in this less inspected frequency region. Therefore, filter shapes and ERBs of the...
Article
Full-text available
Noise with energy in the low-frequency range (i.e. below 200 Hz) is known to produce problems with annoyance and represents an environmental problem (Leventhall, 2004). Attempts to understand and predict problems produced by low-frequency noise require information about human frequency selectivity in the low-frequency range. However, there are few...

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Projects

Project (1)
Project
The main aim of this project is to describe quantitatively the human perception of low-frequency sound and infrasound. Psychoacoustic experiments will be carried out using a purpose built insert-earphone.