Children's pure‐tone detection: A progress report

1978 ◽  
Vol 63 (S1) ◽  
pp. S64-S64
Author(s):  
L. L. Elliott ◽  
D. R. Katz
Keyword(s):  
Pure Tone ◽  
Progress Report ◽  
Tone Detection

Masked and unmasked pure tone detection thresholds of a harbour seal listening in air

1991 ◽  
Vol 69 (8) ◽  
pp. 2059-2066 ◽  
Author(s):  
J. M. Terhune
Keyword(s):  
White Noise ◽  
Pure Tone ◽  
Phoca Vitulina ◽  
Harbour Seal ◽  
Optimal Conditions ◽  
Vascular Changes ◽  
Detection Thresholds ◽  
Noise Masker ◽  
Auditory Systems ◽  
Tone Detection

In-air pure tone detection thresholds of a harbour seal (Phoca vitulina) were measured using behavioural psychophysical techniques. Thresholds dropped from about 70 dB re 20 μPa at 0.1 kHz to about 35 dB re 20 μ Pa at 4 kHz and then increased to about 45 dB re 20 μPa at 16 kHz. Increased sensitivities at 2 and 8 kHz, which have been reported in other pinnipeds, were not evident. In-air intensity detection thresholds averaged 32 dB above their underwater counterparts (1–16 kHz). Masking studies found the critical ratios at 0.25, 0.5, and 1 kHz to be 24, 15, and 21 dB, respectively (white noise masker). From 0.2 to 1.5 kHz, bandwidths 20 dB below the level of pure tone maskers were 0.16–0.18 kHz. Circumstantial evidence suggests the possibility that blood vascular changes associated with diving might also influence the sensitivity of the auditory systems of seals. Under optimal conditions, a pup's airborne cries may be detected by its mother at ranges of 1 km or more.

Research of Pure Tone Detection for Faulted On-Vehicle Loudspeakers Based on Image Fractal

2014 ◽  
Vol 494-495 ◽  
pp. 171-174 ◽  
Author(s):  
Gui Ling Tan ◽  
Yu Ming Qi ◽  
San Peng Deng ◽  
De Hua Miao ◽  
Wen Hua Gao
Keyword(s):  
Pure Tone ◽  
Wavelet Packet ◽  
Detection Accuracy ◽  
Monitoring Method ◽  
Time Frequency ◽  
Two Dimensional Image ◽  
Box Counting ◽  
Fault Recognition ◽  
Box Counting Dimension ◽  
Tone Detection

At present, the detection accuracy of monitoring method by human ears is not satisfying in the pure tone detection of on-vehicle loudspeakers. To solve this problem, a new method is proposed to convert vehicle loudspeakers response signals into a two-dimensional image signal via wavelet packet analysis, which can increase the time-frequency of malfunction information. Through image binaryzation and pretreatment image-edge detection, the resulting signal would be recognized with box-counting dimension acquired in the process of gaining time-frequency image through fractal dimension as malfunctioned indications. Experiments show a rate of fault recognition as high as 95% , which meet the requirements of online vehicle loudspeaker detection.

Hearing in the ferret (Mustela putorius): Thresholds for pure tone detection

1986 ◽  
Vol 24 (3) ◽  
pp. 269-275 ◽  
Author(s):  
Jack B. Kelly ◽  
Gerard L. Kavanagh ◽  
James C.H. Dalton
Keyword(s):  
Pure Tone ◽  
Mustela Putorius ◽  
Tone Detection

Children’s pure‐tone detection

1980 ◽  
Vol 67 (1) ◽  
pp. 343-344 ◽  
Author(s):  
Lois L. Elliott ◽  
Debra R. Katz
Keyword(s):  
Pure Tone ◽  
Tone Detection

Spectrophotometric measurements of objective-prism spectra

1966 ◽  
Vol 24 ◽  
pp. 118-119
Author(s):  
Th. Schmidt-Kaler
Keyword(s):  
Progress Report ◽  
Two Dimensional ◽  
Objective Prism ◽  
Made In

I should like to give you a very condensed progress report on some spectrophotometric measurements of objective-prism spectra made in collaboration with H. Leicher at Bonn. The procedure used is almost completely automatic. The measurements are made with the help of a semi-automatic fully digitized registering microphotometer constructed by Hög-Hamburg. The reductions are carried out with the aid of a number of interconnected programmes written for the computer IBM 7090, beginning with the output of the photometer in the form of punched cards and ending with the printing-out of the final two-dimensional classifications.

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