Full sentences from the TIMIT database69 were synthesized with the harmonics unperturbed or with the third harmonic mistuned upwards by an amount that varied across conditions (0.5, 2, 6, or 20% of the f0, values that pilot demonstrations suggested would span a range of performance levels). Complex tones were synthesized with the first 12 harmonics of an f0 (randomly sampled on a logarithmic scale between 70 and 250 Hz) and were 500 ms in duration. On half the trials, the third harmonic was mistuned (again upwards by 0.5, 2, 6, or 20%). A 10 ms half-Hanning window was applied to the start and end of the tone. All stimuli were presented at 70 dB sound pressure level (SPL) over Sennheiser HD280 headphones via a MacMini with built-in sound card.
Hd 280 headphones
Manufactured by Sennheiser
Sourced in United Kingdom
The HD 280 is a closed-back, circumaural headphone designed for professional audio applications. It features a robust construction, a collapsible design, and a frequency response range of 8 Hz to 25 kHz. The HD 280 is intended for monitoring and critical listening purposes.
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Lab products found in correlation
9 protocols using hd 280 headphones
1
Harmonic Mistuning Effects on Auditory Perception
2
Assessing Auditory Perception and Language Processing
3
QuickSIN Speech-in-Noise Assessment
4
Visual Stimulus Presentation and Validation Protocol
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All visual stimuli were presented on a gamma-corrected Compaq P1220 CRT monitor with a refresh rate of 100 Hz and a resolution of 1280 × 1024. This was connected to a 2 × 2.26 GHz quad-core Apple Mac Pro desktop computer running Mac OS 10.6.8. All stimuli were generated using Matlab v. 7.9.0 (Mathworks, USA) running the Psychtoolbox Extension v. 3.0 (Brainard and Pelli, 1997, www.psychtoolbox.org ). The physical durations of all auditory and visual stimuli were verified using a dual-channel oscilloscope. The auditory stimulus was a 500 Hz tone presented through Sennheiser HD 280 headphones. Visual stimuli were isotropic, luminance-defined Gaussian blobs (mean luminance 77 cd m−2) presented against a uniform grey background of 37 cd m−2, whose luminance (L) profile was defined as follows:
where Lmax is the peak luminance value (set to 94 cd m−2) and σstim is the standard deviation of the Gaussian.
In the initial experiment (figures 2 a–c and 3b) σstim was set to 1°. In subsequent experiments, stimulus size was modified by increasing (σstim = 1.5°, figure 3 c) or decreasing (σstim = 0.5°, figure 3 a) this value.
where Lmax is the peak luminance value (set to 94 cd m−2) and σstim is the standard deviation of the Gaussian.
In the initial experiment (
5
Speech Perception in Noise Evaluation
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Testing was carried out in the same double-walled sound-attenuated chamber that was used for the audiometric testing, but using Sennheiser HD280 headphones. All testing was in the left ear only. As the study consisted of two visits around 1 week apart, the speech perception task was tested in the first session for half of the participants and in the second session for the other half. The overall presentation level of the target stimuli was individually adjusted to be 30 dB above each listener’s speech reception threshold (dB sensation level). This was done to partially account for differences in hearing level. Sentences were presented in blocks of high/low predictability and high/low SNR, with block presentation counterbalanced across participants. The 13 sentences within each block were randomized. For the purpose of the current study, the intelligibility scores for both types of sentences and both types of SNR were averaged to create a single score. Testing was self-paced. Speech perception scores were “rationalized” arcsine (RAU)-transformed (Studebaker 1985 (link)) to linearize the s-shaped psychometric function of normal speech perception.
6
Perception of L1 and L2 Speech Sounds
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For the recording of the speech samples, instructions were presented on a 27-inch computer screen. The acoustic speech signal was recorded at 22.05 kHz with the AAA software package (Articulate Instruments Ltd) and a Shure WH20 XLR headset microphone. Ultrasound imaging data of the speakers’ tongue movements were also simultaneously collected, but these were not analyzed for the present article.
The L1 perception experiment was implemented in PsychoPy (version 1.90.3), and the speech samples were presented through a pair of Sennheiser HD 280 headphones. The L2 perception experiment, developed and executed through the LimeSurvey survey tool (LimeSurvey.org ), took place on the participants’ own computers.
The L1 perception experiment was implemented in PsychoPy (version 1.90.3), and the speech samples were presented through a pair of Sennheiser HD 280 headphones. The L2 perception experiment, developed and executed through the LimeSurvey survey tool (
7
Beat Perception and Production Tasks Using Gold-MSI Stimuli
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Musical stimuli were taken from the Beat Alignment Test of the Goldsmiths Musical Sophistication Index (Gold-MSI) v1.0 [26 (link)] downloaded from https://www.gold.ac.uk/music-mind-brain/gold-msi/download/ . Version 1.0 of the Gold-MSI is optimized relative to the version reported in Müllensiefen et al., (2014) [26 (link)], with 17 items, selected as described in documentation available at https://www.gold.ac.uk/music-mind-brain/gold-msi/download/ (S1 Fig ). Musical excerpts were chosen from a variety of music genres and ranged from 10 to 16 seconds in duration. In the beat perception task, beeps were superimposed on the music excerpts 5 seconds into the music. The BAT was administered on a PC laptop using E-Prime (2.0) software (Psychology Software Tools, 2002). Auditory stimuli were delivered through Sennheiser HD 280 headphones. All participants completed both beat perception and production tasks in one session.
8
Auditory and Visual Cognitive Tasks in Sound-Attenuating Booth
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Testing was carried out in a double-wall sound-attenuating booth (Industrial Acoustics Company (IAC), Winchester, UK) using Sennheiser HD280 headphones. All testing was in the left ear only. The SiN and Stroop tasks formed part of a larger battery of tests, which were administered over the course of two sessions around a week apart. The two SiN tasks (words and sentences) were always tested in different sessions; the two Stroop tasks (auditory and visual) were tested in different sessions wherever possible, which was the majority of cases. The order of SiN tasks was counterbalanced across participants. There was no systematic pairing of SiN and Stroop tasks within sessions.
9
Measuring Speech Onset Latencies
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The visual stimuli were presented on a 19-inch EIZO S1910 computer screen as black line drawings on a light grey background (RGB 244 244 244). Viewing distance was about 60 cm. The presentation of the visual and auditory stimuli and the online collection of the data were controlled by the NESU program (1998, Max Planck Institute for Psycholinguistics, Nijmegen). Auditory distractors were presented with Sennheiser HD 280 headphones at a comfortable volume. Speech onset latencies were measured to the closest millisecond with a Sennheiser ME 64 microphone via a voice-key connected to the computer. Speech errors, dysfluencies, and technical errors were coded online by the experimenter. Responses to the WM task were recorded with a button box connected to the computer.
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