Abstract:
The invention concerns a method of detecting a reflex of the human stapedius muscle (4), in particular for a hearing test. According to the method, the reflex is triggered by means of an acoustic signal, and the impedance or the variation in impedance brought about by means of the reflex at the eardrum (1) is measured by means of a further acoustic signal. The object of the invention is to further improve the stapedius reflex audiometry method so that it can be applied in practice. To that end, at least two chronologically successive or mutually overlapping substantially identical acoustic signals (11, 12) are used. The information concerning a possible impedance variation at the eardrum (1) is obtained by forming the difference between the acoustic characteristics produced and registered by the signals.
Abstract:
The invention concerns a device for determining data on auditory capacity, the device having preferably non-contact means for measuring vibrations of the middle-ear ossicles (22, 23, 24) and/or the tympanic membrane (21) by means of electromagnetic waves. The electromagnetic waves used for the measurement are input by means of a microscope (3), in particular an optical microscope (3). This microscope can be modular in design, and a module (5) can be provided for the input of a laser beam (9). The invention also concerns a method of determining data on auditory capacity, the method calling for the vibration of the middle ear and/or the eardrum to be measured by means of electromagnetic waves and, from the measurement signals thus obtained, the contributions to the total signal by the middle ear and/or the eardrum determined in at least one processing step.
Abstract:
Probe (1) for an audiometric apparatus (3) to which the probe is coupled by means of a cable (4) and a tube (5). On the tip of the probe there is placed a sealing plug (6) so that the open end (7) of the probe can have acoustic and pressure communication with the blocked area of the person's ear canal (2). The probe (1) comprises a number of parts which can be separated from one another, including the probe tip, which in a simple manner can be removed for replacement or cleaning without this having any influence on the transducers in the probe.
Abstract:
The invention relates to an apparatus for measuring the sensitivity of a subject's perception of vibration, for example an audiometer. It comprises: a vibration emitter (1), signalling means (2) activated by the subject when the detection threshold is exceeded, an electronic processing unit (3) which memorizes the frequency and level of vibration each time a subject's detection threshold is exceeded and controls the frequency and level of the vibration emitted. According to the invention, the processing unit (3) explores a vibration reference level by a frequency sweep, then searches for detection thresholds corresponding to vibration levels which are different to the reference level by means of a series of iterative sweeps.
Abstract:
A probe tube (17) is inserted into the ear canal (11) of a patient to a first position in which the probe tube tip (35) is spaced well away from the ear drum. A broad band sound signal is provided to the patient's ear and a frequency response of sound detected at the probe tube tip (35) is taken. The probe tube tip (35) is then moved a known distance to a second position within the ear canal, the broad band sound stimulus signal is again applied, and the frequency response of sound detected by the probe tube tip (35) is taken. The distance of the probe tube tip (35) from the ear drum can be determined from the two frequency responses, particularly by subtracting the frequency response in dB at one position from the frequency response in dB at the other position, and the difference frequency response will show a distinct peak at a quarter wavelength null frequency, which allows the distance of the probe tube tip (35) from the ear drum to be estimated based on the relationship. The frequency responses measured with the probe tube (17) at the two positions can further be used to estimate the actual sound pressure at the ear drum and the impedance of the ear drum by using relationships derived from models of the ear canal. The probe tube (17) may be utilized with either an unoccluded ear or with an ear occluded by an ear mold (14); if the ear is occluded, a hearing aid (19) delivers the sound to the ear canal through a delivery tube (18) passing through the ear mold (14). A pair of probe tubes (17, 36) having tips (35, 37) spaced a known distance from one another may be used in place of the single probe tube (17), allowing frequency responses to be taken from both tubes (17, 36) simultaneously to a sound stimulus signal.
Abstract:
A noninvasive apparatus for detecting and analyzing joint disorders utilizing an acoustic signal processing technique. The diagnostic apparatus graphically correlates joint induced sound patterns (12) relative to the joint position in time and space (10) thereby providing a quantitative approach for the diagnosis of specific joint disorders. The present invention, termed Arthrophonometry, is particularly well suited for differential diagnosis of the temporomandibular (TMJ) joint. A microphone (28) detects the joint positions. An oscilloscope (34) graphically correlates the joint induced sound patterns and joint positions.