Effects of modulator shape at thresholds and supra-thresholds spectral modulation perception

2021 ◽  
Vol 150 (4) ◽  
pp. A143-A143
Author(s):  
Sittiprapa Isarangura ◽  
Ann C. Eddins ◽  
Aaron Seitz ◽  
Frederick J. Gallun ◽  
David A. Eddins
Keyword(s):  
Spectral Modulation

scholarly journals High power GaN-based blue superluminescent diodes with low spectral modulation

AIP Advances ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 045202
Author(s):  
Wei Xiong ◽  
Lei Hu ◽  
Jianping Liu ◽  
Lingrong Jiang ◽  
Aiqin Tian ◽  
...  
Keyword(s):  
High Power ◽  
Spectral Modulation ◽  
Superluminescent Diodes

scholarly journals How Do Age and Hearing Loss Impact Spectral Envelope Perception?

2018 ◽  
Vol 61 (9) ◽  
pp. 2376-2385 ◽  
Author(s):  
Erol J. Ozmeral ◽  
Ann C. Eddins ◽  
David A. Eddins
Keyword(s):  
Hearing Loss ◽  
Spectral Resolution ◽  
Modulation Frequency ◽  
Normal Hearing ◽  
Frequency Resolution ◽  
Spectral Envelope ◽  
Detection Thresholds ◽  
Spectral Modulation ◽  
Modulation Detection ◽  
Moderate Hearing Loss

Purpose The goal was to evaluate the potential effects of increasing hearing loss and advancing age on spectral envelope perception. Method Spectral modulation detection was measured as a function of spectral modulation frequency from 0.5 to 8.0 cycles/octave. The spectral modulation task involved discrimination of a noise carrier (3 octaves wide from 400 to 3200 Hz) with a flat spectral envelope from a noise having a sinusoidal spectral envelope across a logarithmic audio frequency scale. Spectral modulation transfer functions (SMTFs; modulation threshold vs. modulation frequency) were computed and compared 4 listener groups: young normal hearing, older normal hearing, older with mild hearing loss, and older with moderate hearing loss. Estimates of the internal spectral contrast were obtained by computing excitation patterns. Results SMTFs for young listeners with normal hearing were bandpass with a minimum modulation detection threshold at 2 cycles/octave, and older listeners with normal hearing were remarkably similar to those of the young listeners. SMTFs for older listeners with mild and moderate hearing loss had a low-pass rather than a bandpass shape. Excitation patterns revealed that limited spectral resolution dictated modulation detection thresholds at high but not low spectral modulation frequencies. Even when factoring out (presumed) differences in frequency resolution among groups, the spectral envelope perception was worse for the group with moderate hearing loss than the other 3 groups. Conclusions The spectral envelope perception as measured by spectral modulation detection thresholds is compromised by hearing loss at higher spectral modulation frequencies, consistent with predictions of reduced spectral resolution known to accompany sensorineural hearing loss. Spectral envelope perception is not negatively impacted by advancing age at any spectral modulation frequency between 0.5 and 8.0 cycles/octave.

Spectral modulation sensitivity based perceptual acoustic echo cancellation

2013 ◽  
Author(s):  
Wei-Lun Chuang ◽  
Kah-Meng Cheong ◽  
Chung-Chien Hsu ◽  
Tai-Shih Chi
Keyword(s):  
Echo Cancellation ◽  
Acoustic Echo Cancellation ◽  
Spectral Modulation ◽  
Acoustic Echo

Effects of Spectral Modulation on Time-Domain Characteristics of Pulses in Amplifier

2017 ◽  
Vol 44 (5) ◽  
pp. 0501001
Author(s):  
薛兴泰 Xue Xingtai ◽  
赵研英 Zhao Yanying ◽  
李荣凤 Li Rongfeng ◽  
耿易星 Geng Yixing ◽  
卢海洋 Lu Haiyang ◽  
...  
Keyword(s):  
Time Domain ◽  
Spectral Modulation

Spectral Modulation through the Hybridization of Mie-Scatterers and Quasi-Guided Mode Resonances: Realizing Full and Gradients of Structural Color

ACS Nano ◽  
2020 ◽  
Vol 14 (11) ◽  
pp. 15317-15326 ◽  
Author(s):  
Jaehyuck Jang ◽  
Trevon Badloe ◽  
Younghwan Yang ◽  
Taejun Lee ◽  
Jungho Mun ◽  
...  
Keyword(s):  
Structural Color ◽  
Spectral Modulation ◽  
Guided Mode

scholarly journals Spectral Modulation of Optofluidic Coupled-Microdisk Lasers in Aqueous Media

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1439 ◽  
Author(s):  
Zhihe Guo ◽  
Haotian Wang ◽  
Chenming Zhao ◽  
Lin Chen ◽  
Sheng Liu ◽  
...  
Keyword(s):  
Aqueous Media ◽  
Microfluidic Channel ◽  
Single Mode ◽  
Pump Light ◽  
Laser Spectrum ◽  
Spectral Modulation ◽  
Microcavity Laser ◽  
Potential Applications ◽  
Laser Systems ◽  
Doped Polymer

We present the spectral modulation of an optofluidic microdisk device and investigate the mechanism and characteristics of the microdisk laser in aqueous media. The optofluidic microdisk device combines a solid-state dye-doped polymer microdisk with a microfluidic channel device, whose optical field can interact with the aqueous media. Interesting phenomena, such as mode splitting and single-mode lasing in the laser spectrum, can be observed in two coupled microdisks under the pump laser. We modulated the spectra by changing the gap of the two coupled microdisks, the refractive indices of the aqueous media, and the position of a pump light, namely, selective pumping schemes. This optofluidic microlaser provides a method to modulate the laser spectra precisely and flexibly, which will help to further understand spectral properties of coupled microcavity laser systems and develop potential applications in photobiology and photomedicine.

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