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Topic: Absolute threshold of hearing

Related Topics

Threshold of pain

Psychoacoustic model

Psychoacoustics

Temporal masking

High frequency limit

Subband encoding

Auditory illusion

Acoustics

Sound intensity

Sound pressure level

Reverberation

Audio signal processing

AC3

Sound impedance

Sine

	Tinnitus Archive: Glossary
		For example, a subject with threshold 40 dB higher (worse) than 0 dB at a given frequency would be said to have a threshold of "40 dB HL" at that frequency.
		A wearable device (resembling a hearing aid) that combines both a tinnitus masker and a hearing aid in the same case in order to provide effective masking for individuals who have a hearing loss as well as tinnitus, as is typical for the vast majority of individuals with clinically-significant tinnitus.
		The diagnostic criteria for TMJ syndrome is a topic that is undergoing considerable debate at present, and consequently the prevalence of tinnitus attributable to TMJ syndrome is currently unknown.
	www.tinnitusarchive.org /glossary (1633 words)

	Absolute threshold of hearing - Wikipedia, the free encyclopedia
		The absolute threshold of hearing (ATH) is the minimum amplitude (level or strength) of a pure tone that the average ear with normal hearing can hear in a noiseless environment.
		The threshold of pain is the SPL beyond which sound becomes unbearable for a human listener.
		The absolute threshold of hearing represents the lowest curve amongst the set of equal-loudness contours, with the highest curve representing the threshold of pain.
	en.wikipedia.org /wiki/Absolute_Threshold_of_Hearing (282 words)

	[No title] (Site not responding. Last check: 2007-10-20)
		hearing aid fitting is dependent on many factors, not least of which is prescription of appropriate sound signal processing parameters according to which the hearing aid shall operate.
		absolute threshold of hearing at various frequencies) are often used as input data to a procedure whereby appropriate choices of frequency response and compression parameters are prescribed.
		Also previous hearing aid experience is of importance when prescribing the initial setting of the hearing aid, as the amount of amplification giving optimally intelligible reproduction of speech is often more than can be tolerated by a user unaccustomed to the loudness of sounds provided by hearing aids.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=03/30586.030410&ELEMENT_SET=DECL (2782 words)

	[No title] (Site not responding. Last check: 2007-10-20)
		The absolute threshold of hearing and the equal-loudness contours are among the most fundamental aspects of the human hearing.
		Both the threshold and the equal-loudness contours are frequency dependent, and for the equal-loudness contours, the dependence varies with level, thus reflecting non-linearities of the human hearing.
		Thresholds were measured for the whole auditory range and a fine agreement was seen with previous investigations.
	acoustics.aau.dk /news/ml_phd_announce.html (396 words)

	Speech perception, production and physiology concepts for researchers
		The plot of threshold against frequency for the two ears is called an audiogram, and shows threshold in db (referenced the normal threshold) as a function of frequency.
		The cochlea, or organ of hearing, is a spiral chamber.
		The masking effect of one sound on another is measured as the increase in threshold (in decibels) for the stimulus sound in the presence of the masking sound, compared to the stimulus threshold when the stimulus is presented alone.
	pages.cpsc.ucalgary.ca /~hill/papers/conc/body.htm (15941 words)

	YourArt.com >> Encyclopedia >> ear (Site not responding. Last check: 2007-10-20)
		Audation is the scientific name for the sence of hearing.
		The organ of Corti is the actual organ of hearing.
		The inner ear comprises both the organ of hearing (the cochlea) and the labyrinth or vestibular apparatus, the organ of balance located in the inner ear that consists of three semicircular canals and the vestibule.
	www.yourart.com /research/encyclopedia.cgi?subject=/ear (442 words)

	Untitled Document
		The masking threshold is thus used to remove irrelevant information from the audio signal, and also determines the accuracy with which the remaining parts of the signal are quantized.
		The absolute threshold of hearing at any particular frequency will vary be-tween individuals, but the average value is well documented and can be used as a fixed lower limit in the calculation of the noise masking threshold described above.
		Essentially the mask threshold is only calculated at certain perceptually critical frequencies of the spectrum and the threshold value applied to a larger group of frequency coefficients clustered around this value.
	www.surroundmusic.net /articles/dtsco2.html (4315 words)

	lame(1): create mp3 audio files - Linux man page
		The Absolute Threshold of Hearing is the minimum threshold under which humans are unable to hear any sound.
		In the past, LAME was using ATH shape 0 which is the Painter and Spanias formula.
		Lower the ATH (absolute threshold of hearing) by n dB.
	www.die.net /doc/linux/man/man1/lame.1.html (3174 words)

	Web QnA (Site not responding. Last check: 2007-10-20)
		This is due to the fact that the person may not be detecting the signal in the low-frequency region of the cochlea, because of the upward spread of excitation.
		Thresholds for a 1200 Hz tone were tested in broadband noise and a variable width notched noise centered around 1200 Hz.
		Therefore frequency selectivity is poorer when threshold increases, either by broad band noise in case of normal hearing listeners or by cochlear pathology with the hearing impaired.
	curriculum.calstatela.edu /WebQnA/webqna.pl?module=tbell2-12&action=viewall (2747 words)

	Full command line switch reference
		Lower the ATH (absolute threshold of hearing) by n dB.
		The Absolute Threshold of Hearing is the minimum threshold under which humans are unable to hear any sound.
		Disable any use of the ATH (absolute threshold of hearing) for masking.
	www.roemersoftware.com /help/switchs.html (2432 words)

	[No title] (Site not responding. Last check: 2007-10-20)
		The method of claim 1, wherein each of the plurality of sub-bands correspond to a critical band of a plurality of critical bands of the psycho-acoustic model, and wherein the masking thresholds are a function of the plurality of critical bands.
		The normalizer of claim 8, wherein each of the plurality of sub-bands correspond to a critical band of a plurality of critical bands of the psycho-acoustic model, and wherein the masking thresholds are a function of the plurality of critical bands.
		The computer readable medium of claim 15, wherein each of the plurality of sub-bands correspond to a critical band of a plurality of critical bands of the psycho-acoustic model, and wherein the masking thresholds are a function of the plurality of critical bands.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=03/102924.031211&ELEMENT_SET=DECL (2753 words)

	Threshold_of_Pain (Site not responding. Last check: 2007-10-20)
		At lower levels occur the threshold of feeling (or tickle) and the threshold of discomfort.
		Determination of the threshold of audibility and the threshold of feeling.
		Curves 1 to 6 represent attempts to determine the absolute threshold of hearing at various frequencies by the authors listed.
	www.sfu.ca /sonic-studio/handbook/Threshold_of_Pain.html (198 words)

	lame-3.96.1(1) (Site not responding. Last check: 2007-10-20)
		ATH related: --noath Disable any use of the ATH (absolute threshold of hearing) for masking.
		--athtype shape The Absolute Threshold of Hearing is the minimum threshold under which humans are unable to hear any sound.
		Normally, humans are unable to hear any sound below this threshold, but for music recorded at very low level this option might be usefull.
	hpux.cs.utah.edu /hppd/hpux/X11/Emulators/lame-3.96.1/man.html (3867 words)

	FAA Medical Certification / Headsets / Hearing Protection
		Still, because our hearing is an important defensive tool — for warning of danger — and not just for normal verbal communication, it must detect more than the sound of another human being.
		This small organ of hearing, called the cochlea because of its snail shell shape, is embedded deep in the skull at the end of the inner ear canal.
		Regardless of what hearing protection you choose, the important message to hear is — use it whenever you fly.
	www.leftseat.com /AME/headset.htm (1040 words)

	Refined Audiometrics Laboratory (Site not responding. Last check: 2007-10-20)
		Also shown on the analyzer display are a (generously low) estimated masking threshold in Yellow, and the user's own threshold elevations in Orange.
		The Magenta line is the absolute threshold of perfect hearing, something we never encounter in the real world.
		Instead, the normal audiological threshold of perfect hearing is the horizontal blue'ish line elevated about 20 dB above that absolute threshold.
	refinedaudiometrics.com /sampleresults.shtml (1043 words)

	Absolute Threshold of Hearing (Site not responding. Last check: 2007-10-20)
		The simplest property to exploit is the ATH (Absolute Threshold of Hearing).
		We simply cannot hear sounds which are too weak.
		The ATH varies a lot with the frequency of the test sound, which can be seen in figure 1.
	www-ccrma.stanford.edu /~bosse/proj/node11.html (71 words)

	Hearing
		The mechanics of hearing are straightforward and well understood, but the action of the brain in interpreting sounds is still a matter of dispute among researchers.
		At the low end of the frequency range of hearing, the ear becomes less sensitive to soft sounds, although the pain threshold as well as judgments of relatively loud sounds are not affected much.
		The threshold of hearing for a particular tone can be raised by the presence of another noise or another tone.
	arts.ucsc.edu /EMS/Music/tech_background/TE-03/teces_03.html (2111 words)

	Ear - Voyager, the free encyclopedia (Site not responding. Last check: 2007-10-20)
		The Eustachian tubes are normally pinched off at the nose end, to prevent being clogged with phlegm, but they may be opened by lowering and protruding the jaw; this is why yawning helps relieve the pressure felt in the ears when on board an aircraft.
		The cochlea (latin for "snail") is a spiralled, hollow, conical chamber of bone filled with perilymph and endolymph (in the scala media), a fluid medium that receives the sound vibrations transmitted from the air to the oval window through the ear drum and ossicles of the middle ear (see above).
		This is a common cause of partial hearing loss and is the reason why anyone using firearms or heavy machinery should wear earmuffs or earplugs.
	www.voyager.in /Ear (1229 words)

	Search Results: ath - ABCNEWS.com
		Ath (Dutch: Aat) is a municipality located in the Belgian province of Hainaut.
		The absolute threshold of hearing (ATH) is the minimum amplitude (level or...
		ATh is not a member of any public groups...
	infospace.abcnews.com /_1_ZU5T7O03GG6FHY__info.abcnws/dog/results?otmpl=dog/webresults.htm&qcat=web&ran=&qkw=ath (564 words)

	Psychoacoustics - Music Encyclopedia (Site not responding. Last check: 2007-10-20)
		It is important to note that the question of what humans hear is not only a physiological question of features of the ear but very much also a psychological issue.
		By measuring this minimum intensity for testing tones of various frequencies, a frequency dependent Absolute Threshold of Hearing (ATH) curve may be derived.
		Human hearing is basically like a spectral analyzer, that is, the ear resolves the spectral content of the pressure wave without respect to the phase of the signal.
	www.music.bestdownload.biz /music/index.php?title=Psychoacoustics (1121 words)

	Absolute Threshold of Hearing - Hydrogenaudio Knowledgebase (Site not responding. Last check: 2007-10-20)
		The Absolute Threshold of Hearing (ATH) is the volume level at which one can detect a particular sound 50% of the time.
		If one has a low absolute threshold, it means that he is able to detect small amounts of stimulation, and thus is more sensitive.
		The ATH is the simplest property of human hearing to exploit when designing a psychoacoustics model.
	wiki.hydrogenaudio.org /index.php?title=ATH (129 words)

	[No title]
		Useful Psychoacoustics Concepts In psychoacoustics, a few important concepts that govern human hearing are the absolute threshold of hearing, critical bands, and amplitude masking.
		Absolute threshold of hearing (ATH) is the amount of energy in dB SPL needed for a pure tone to be detected by a listener in a noiseless environment.
		Since the area below the curve represents an inaudible region in human hearing, we may discard the portion of auditory spectrum whose SPL amplitude is below the threshold curve after taking into account the frequency and temporal masking.
	users.ece.gatech.edu /~rmunkong/Weekly_Report_02_13.doc (1360 words)

	Psychoacoustic
		As a reasult of these tests human audiotary system was modeled using two properties: Absolute Threshold of Hearing and Audiotary Masking.
		Humans can hear voices only when these voices are between 64Hz - 23kHz and greater then Absolute Threshold of Hearing (ATH).
		Hear is the masking thresholds for model one (blue), two (red) and power spectrum (green) values for the same frame.
	www.students.itu.edu.tr /~yaslan/psy.htm (181 words)

	Terhardt2000a
		For all frequencies the absolute magnitude of H
		The majority of parameters included in the PET system can be deduced from the absolute threshold of hearing.
		An algorithm is described by which scaling of channel frequencies is obtained such that overlap of frequnency responses is one and the same in all channels.
	www.mmk.e-technik.tu-muenchen.de /persons/ter/ab/105.html (592 words)

	Psychoacoustic Model
		This level was the threshold at which the tone could be heard.
		If a signal has any frequency components with power levels that fall below the absolute threshold of hearing, then these components can be discarded, as the average listener will be unable to hear those frequencies of the signal anyway.
		Determining whether a frequency component is a tone requires knowing whether it has been held constant for a period of time, as well as whether it is a sharp peak in the frequency spectrum, which indicates that it is above the ambient noise of the signal.
	is.rice.edu /~welsh/elec431/psychoAcoustic.html (1133 words)

	Hydrogenaudio Forums -> lame 3.96.1 - new ATH type
		I noticed that the 3.96.1 version of lame uses ATH type 4 by default, the olders versions used ATH type 2 by default.
		i understand that ATH means 'Absolute threshold of hearing' and it means that whats encoded will only be frequencies that humans can hear.
		In current versions every ath curve is internally ran through the ath4 model, with different parameters.
	www.hydrogenaudio.org /forums/index.php?showtopic=31358 (639 words)

	Hydrogenaudio Forums -> stereo vs joint stero / ath
		ATH stands for "absolute threshold of hearing" and is a curve of frequency versus volume.
		It describes the minimum volume needed for sound at a given frequency to be audible.
		Perform a search on "absolute threshold hearing" to read some semi-relevant threads.
	www.hydrogenaudio.org /forums/index.php?showtopic=1387 (355 words)

	Human Hearing: Amplitude Sensitivity Part 1
		Knowing how we hear, as well as understanding the limits that define our auditory mechanism, is essential when rendering subjective judgments on the performance of any piece of audio hardware.
		The resultant range is owing to varying methodologies used by the researchers and, of course, the response of the human hearing apparatus to the applied acoustic signals.
		One of the most difficult aspects of writing about human hearing performance is that there are so few absolutes to be found in the mountains of variables that characterize the process of human hearing.
	www.audioholics.com /techtips/roomacoustics/HumanHearingAmplitude.php (1922 words)

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