Suggested Threshold Sound Pressure Levels For Frequency Modulated (Warble) Tones in the Sound Field

Morgan, Donald E.; Dirks, Donald D.; Bower, Deborah R.

doi:10.1044/jshd.4401.37

Cited by 35 publications

(16 citation statements)

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“…Only the hearing of a Pacific walrus ͑Odobenus rosmarus divergens͒ and two Steller sea lions ͑Eumetopias jubatus͒ have been tested with narrowband FM tonal signals ͑Kastelein et al, 2002 to create a more stable received SPL. In humans, FM signals tend to have a slightly higher arousal effect than pure tones, and therefore slightly lower hearing thresholds ͑Ͻ5 dB depending on center frequency and modulation frequency; Morgan et al, 1979͒. However, the use of FM signals instead of pure tones probably had little effect on the thresholds found in the present study.…”

Section: A Evaluation Of the Datacontrasting

confidence: 51%

Underwater detection of tonal signals between 0.125 and 100kHz by harbor seals (Phoca vitulina)

Kastelein¹,

Wensveen²,

Hoek³

et al. 2009

The Journal of the Acoustical Society of America

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The underwater hearing sensitivities of two 1-year-old female harbor seals were quantified in a pool built for acoustic research, using a behavioral psychoacoustic technique. The animals were trained to respond when they detected an acoustic signal and not to respond when they did not (go/no-go response). Pure tones (0.125-0.25 kHz) and narrowband frequency modulated (tonal) signals (center frequencies 0.5-100 kHz) of 900 ms duration were tested. Thresholds at each frequency were measured using the up-down staircase method and defined as the stimulus level resulting in a 50% detection rate. The audiograms of the two seals did not differ statistically: both plots showed the typical mammalian U-shape, but with a wide and flat bottom. Maximum sensitivity (54 dB re 1 microPa, rms) occurred at 1 kHz. The frequency range of best hearing (within 10 dB of maximum sensitivity) was from 0.5 to 40 kHz (6(1/3) octaves). Higher hearing thresholds (indicating poorer sensitivity) were observed below 1 and above 40 kHz. Thresholds below 4 kHz were lower than those previously described for harbor seals, which demonstrates the importance of using quiet facilities, built specifically for acoustic research, for hearing studies in marine mammals. The results suggest that under unmasked conditions many anthropogenic noise sources and sounds from conspecifics are audible to harbor seals at greater ranges than formerly believed.

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Section: A Evaluation Of the Datacontrasting

confidence: 51%

Underwater detection of tonal signals between 0.125 and 100kHz by harbor seals (Phoca vitulina)

Kastelein¹,

Wensveen²,

Hoek³

et al. 2009

The Journal of the Acoustical Society of America

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show abstract

“…Puretone thresholds were obtained using warble tones in sound field. Calibration data were those suggested by Morgan, et al 4 The mean pure-tone performance with one standard deviation is presented in Table II with mean performance graphically depicted in Figure 2. Environmental testing indicated a mean performance of 73% correct, and a range of 40% to 100% (Table III) had CID performance results of less than 20% (Table VI).…”

Section: Resultsmentioning

confidence: 99%

Auditory Performance With simultaneous Intracochlear Multichannel Stimulation

Parkin

Randolph

1991

The Laryngoscope

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Different sound processing strategies are used in the various cochlear implant designs. This report presents auditory data on 35 patients implanted at the University of Utah from April 1984 to April 1989. A multichannel monopolar electrode system is inserted intracochlearly. During daily use and auditory performance testing, four electrodes receive simultaneous input. The incoming acoustic signal is amplified and routed to the different electrodes through a band‐pass filter system. Mean pure‐tone performances were: 500 Hz−29.6 ± 9.4 dB; 1000 Hz−23.5 ± 13.2 dB; 2000 Hz−25.4 ± 9.6 dB; 4000 Hz−32.1 ± 11.5 dB; and 6000 Hz−42.2 ± 7.7 dB. Audio‐only CID sentence testing showed 51.4% of patients scoring better than 60% and 40% scoring better than 80%. The percutaneous pedestal is well tolerated; patients have had the systems in place for 13 and 15 years.

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“…The warble tones used to obtain free field thresholds were generated by a standard audiometer (Interacoustics AC-5, calibrated according to the ISO 389) with a frequency modulation of 5% and were presented by means of a loudspeaker placed in front of the patient. The free field setup was calibrated according to Morgan et al 13 Free field thresholds were determined only for the patients from clinics 1 and 2. Thresholds were obtained at 0.25, 0.5, 1, 2, and 4 kHz.…”

Section: Methodsmentioning

confidence: 99%

Audiological Results of the Bone-Anchored Hearing Aid HC200: Multicenter Results

Mylanus¹,

Snik²,

Jorritsma³

et al. 1994

Ann Otol Rhinol Laryngol

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Sixty-two patients with conductive or mixed hearing loss (average bone conduction threshold at 0.5, 1, and 2 kHz ranged from 1 to 44 dB hearing level) were fitted with a bone-anchored hearing aid (BAHA type HC200). Previously, 52 of them had used a conventional bone conduction hearing aid (CBHA) and 10 of them an air conduction hearing aid (ACHA). Audiological tests were conducted to compare the patients' performance with the BAHA to that with their previous conventional hearing aid. In the speech recognition in quiet test, only 5 patients in the CBHA group improved significantly: the majority had 100% scores with both hearing aids. In the speech recognition in noise test, 28 patients improved significantly. The mean improvement in the signal to noise ratio (S/N) in the CBHA group was -2.3 +/- 2.4 dB. That none of the patients in the CBHA group performed worse with the BAHA led us to the conclusion that the BAHA is superior to the CBHA. None of the patients in the ACHA group achieved a better speech recognition in quiet score using the BAHA. On average, there was no significant improvement in the S/N ratio in the ACHA group, although in 6 patients the S/N ratio improved significantly, and in 1 patient it worsened significantly. From the whole group, the performance of only 2 patients, both in the ACHA group, was significantly worse with the BAHA on one of the speech recognition tests.

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Suggested Threshold Sound Pressure Levels For Frequency Modulated (Warble) Tones in the Sound Field

Cited by 35 publications

References 0 publications

Underwater detection of tonal signals between 0.125 and 100kHz by harbor seals (Phoca vitulina)

Underwater detection of tonal signals between 0.125 and 100kHz by harbor seals (Phoca vitulina)

Auditory Performance With simultaneous Intracochlear Multichannel Stimulation

Audiological Results of the Bone-Anchored Hearing Aid HC200: Multicenter Results

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