WO2013064933A2 - An apparatus and a method for eliminating the intensity variance of a snoring sound signal due to a subject's head movement during sleep - Google Patents

An apparatus and a method for eliminating the intensity variance of a snoring sound signal due to a subject's head movement during sleep Download PDF

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Publication number
WO2013064933A2
WO2013064933A2 PCT/IB2012/055635 IB2012055635W WO2013064933A2 WO 2013064933 A2 WO2013064933 A2 WO 2013064933A2 IB 2012055635 W IB2012055635 W IB 2012055635W WO 2013064933 A2 WO2013064933 A2 WO 2013064933A2
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subject
sound signal
intensity
detected
head
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PCT/IB2012/055635
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French (fr)
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WO2013064933A3 (en
Inventor
Juan JDU
Sheng Jin
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Koninklijke Philips Electronics N.V.
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Publication of WO2013064933A2 publication Critical patent/WO2013064933A2/en
Publication of WO2013064933A3 publication Critical patent/WO2013064933A3/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/48—Other medical applications
    • A61B5/4806—Sleep evaluation
    • A61B5/4818—Sleep apnoea
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
    • A61B5/0826—Detecting or evaluating apnoea events
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
    • A61B5/1116—Determining posture transitions
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6813—Specially adapted to be attached to a specific body part
    • A61B5/6814—Head
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2505/00—Evaluating, monitoring or diagnosing in the context of a particular type of medical care
    • A61B2505/07—Home care
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
    • A61B5/7207—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise induced by motion artifacts
    • A61B5/721—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise induced by motion artifacts using a separate sensor to detect motion or using motion information derived from signals other than the physiological signal to be measured
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7271—Specific aspects of physiological measurement analysis
    • A61B5/7285—Specific aspects of physiological measurement analysis for synchronising or triggering a physiological measurement or image acquisition with a physiological event or waveform, e.g. an ECG signal

Abstract

The present invention provides an apparatus and a method for eliminating the intensity variance of a snoring sound signal due to a subject's head movement during sleep. The apparatus according to an embodiment of the present invention comprises a sound detection unit for detecting the intensity of the snoring sound signal of the subject, the sound detection unit being placed at a fixed position; a head posture detection unit, which is placed on the head of the subject and which is used for detecting the head posture of the subject at the time the intensity of the snoring sound signal is detected; and a processing unit for calibrating the detected intensity of the snoring sound signal in accordance with the detected head posture of the subject.In this way,irrespective of the head posture of the subject, the calibrated intensity of the snoring sound will be kept at a same level in order to be used for a correct analysis later on.

Description

AN APPARATUS AND A METHOD FOR ELIMINATING THE INTENSITY VARIANCE OF A SNORING SOUND SIGNAL DUE TO A SUBJECT'S HEAD MOVEMENT DURING SLEEP FIELD OF THE INVENTION
The invention relates to snoring sound detection, and particularly to an apparatus and a method for eliminating the intensity variance of a snoring sound signal due to a subject's head movement during sleep. BACKGROUND OF THE INVENTION
Obstructive Sleep Apnea (OSA) is a serious sleep disorder caused by repeated collapse of the upper airway during sleep. Currently the standard diagnosis of OSA is Polysomnography (PSG) which involves recording multiple channels of physiological signals such as: electroencephalogram (EEG), electrooculomotogram (EOG), electromyogram (EMG), electrocardiogram (ECG), air flow, respiratory effort, snoring sound, and blood oxygen saturation (Sp02), etc. Normally the PSG recorder is a large machine accommodated in a sleep lab in the hospital. A patient needs to sleep in the sleep lab for one or more nights with all kinds of wires attached to his body to record all the signals. The results are subsequently analyzed and scored by experts in respiratory diagnosis. PSG is expensive and inconvenient. The limited PSG facilities around the world have resulted in long waiting lists: around 93% of women and 82% of men remain undiagnosed at present.
Efforts are made to simplify the diagnostic method of OSA for home monitoring. Snoring almost always accompanies OSA and is recognized as its earliest symptom. Researchers have attempted to analyze snoring sounds associated with OSA using techniques such as sound intensity calculations, power spectrum estimation and numberof snores in a given time interval. These efforts provided strong evidence that snoring carries information on OSA. Snoring sound analysis enables to distinguish between OSA and simple snoring without OSA. It looks promising to make use of snoring information in a one-channel, contactless way for home monitoring of OSA patients or suspected OSA patients. A snoring sound is one of the most important signals to evaluate obstructive sleep apnea.
Generally, the pathological importance of snoring has been related to its intensity (dB), maximal and mean snoring intensity (dBmax and dBmean, respectively), timing (continuous or interrupted), etc. Snoring sounds are recorded by sound detection means, such as a microphone, which is hung in front of a subject's mouth or nose.
However, during sleep, subjects will turn about now and then, so the snoring sound intensities acquired by the microphone will vary due to the distance change between mouth/nose and microphone. Such variance will make signal processing and signal analysis more complicated.
SUMMARY OF THE INVENTION
In view of the above disadvantages of the prior art, the inventors of the present invention propose a new method and apparatus for snoring sound detection, which eliminate the intensity variance of the snoring sound signal due to a subject's head movement during sleep.
The basic idea of the present invention lies in that a head posture detection unit is introduced in the apparatus of the present invention, and thus the head posture of the subject at the time the snoring sound signal is detected may be identified, for example, face up, face turned left or face turned right.
Thereby, based on the detected head posture of the subject, the detected intensity of the snoring sound can be calibrated and accordingly the calibrated intensity of the snoring sound may be used in the subsequent snoring sound analysis. In this way, irrespective of the head posture of the subject, the calibrated intensity of the snoring sound will be kept at a same level in order to be used for a correct analysis later on. Specifically, according to one aspect of the present invention, there is provided an apparatus for eliminating the intensity variance of the snoring sound signal due to a subject's head movement during sleep, comprising:
a sound detection unit for detecting the intensity of the snoring sound signal of the subject, the sound detection unit being placed at a fixed position;
a head posture detection unit, which is placed on the head of the subject and used for detecting the head posture of the subject at the time the intensity of the snoring sound signal is detected; and
a processing unit for calibrating the detected intensity of the snoring sound signal in accordance with the detected head posture of the subject.
According to an embodiment of the present invention, the processing unit is configured for calibrating the detected intensity of the snoring sound signal by means of the following method.
Specifically, the processing unit may firstly map the detected head posture of the subject to a pre-built look-up table in order to obtain a factor in the table which corresponds to the detected head posture, and then the processing unit may calibrate the detected intensity of the snoring sound signal in accordance with the factor obtained.
The look-up table may pre-establish the one-to-one relationship between a factor and each head posture. In this way, the accuracy of the calibration will be improved.
As for how to establish the look-up table in detail, in an embodiment of the present invention, the pre-built look-up table may be generated by detecting the intensity of a standard sound signal of fixed frequency and fixed duration, which is emitted at different positions around the subject's head so as to simulate the snoring sound signal emitted at different head postures of the subject, and normalizing the detected intensity to the actual intensity of the standard sound signal so that the factor for each head posture is obtained, and wherein the intensity of the standard sound signal is detected by the sound detection unit placed at said fixed position.
In practice, since the detected sound may be variable due to the size of the head of different subjects and different environments (or bedrooms) accommodating the subjects, the inventors of the present invention have found that there is no fixed look-up table for various subjects and environments. Therefore, in an embodiment of the present invention, the pre-built look-up table is generated for different subjects at different environments, so that the accuracy of the calibration can be further improved. The researchers have found that the frequency range of the human snoring sound is normally under 1200Hz, with the peak below 500Hz, and the snoring duration range is 0.3 - 2.3 seconds.
Therefore, in an embodiment of the present invention, the standard sound signal used has a fixed frequency within the range of 300Hz to 500Hz and a fixed duration within the range of 0.3 to 2.3 seconds. In this way, a standard sound, which is quite similar to the human snoring sound in terms of sound characteristics, is adopted and therefore the factors in the look-up table can be more reliable and hence the accuracy of the calibration can be further improved.
In a further embodiment of the present invention, the fixed frequency is selected to be 320Hz and the fixed duration is selected to be 2 seconds.
In an embodiment of the present invention, the sound detection unit is a microphone, the head posture detection unit is an accelerometer, and the distance between the microphone and the accelerometer is selected to be about 15cm-30cm in order to get a clear sound.
Please note that the sound detection unit and the head posture detection unit are not restricted to being a microphone and an accelerometer, respectively. It is easily understood by those skilled in the art that any other sound detection unit and head posture detection unit may be utilized as long as they can detect the snoring sound and the head posture. In an embodiment of the present invention, the accelerometer is placed on the forehead of the subject so that it is in the same plane as the nose or mouth of the subject. In this case, the accelerometer may follow the rotation of the nose or mouth where the snoring sound is emitted in a more accurate manner, so that the accuracy of the calibration can be further improved.
In an embodiment of the present invention, the apparatus further comprises an output unit for outputting the calibrated intensity for snoring analysis.
According to another aspect of the present invention, there is provided a method of eliminating the intensity variance of a snoring sound signal due to the subject's head movement during sleep, comprising:
detecting the intensity of the snoring sound signal of the subject by means of a sound detection unit, which is placed at a fixed position;
detecting the head posture of the subject at the time the intensity of the snoring sound signal is detected; and
calibrating the detected intensity of the snoring sound signal in accordance with the detected head posture of the subject.
According to an embodiment of the present invention, the step of calibrating comprises: mapping the detected head posture of the subject to a pre-built look-up table, which pre-establishes the one-to-one relationship between a factor and each head posture; and
calibrating the detected intensity of the snoring sound signal in accordance with the factor corresponding to the detected head posture,
wherein the each head posture corresponds to each angle within 180°from face turned left to face turned right sleeping postures.
Other objects and advantages of the present invention will become more apparent and will be easily understood with reference to the description given in combination with the accompanying drawings.
DESCRIPTION OF THE DRAWINGS
The present invention will be described and explained hereinafter in more detail in combination with embodiments and with reference to the drawings, in which:
Fig. 1 is a block diagram of the apparatus for eliminating the intensity variance of a snoring sound signal due to a subject's head movement during sleep in accordance with an embodiment of the present invention;
Fig. 2 shows the basic idea of the present invention; and
Fig. 3 is a flowchart of the method of eliminating the intensity variance of a snoring sound signal due to a subject's head movement during sleep in accordance with an embodiment of the present invention.
The same reference signs in the figures indicate similar or corresponding features and/or functionalities.
DETAILED DESCRIPTION
An embodiment of the present invention will be described hereinafter in more detail with reference to the drawings.
Fig. 1 is a block diagram of the apparatus for eliminating the intensity variance of a snoring sound signal due to a subject's head movement during sleep in accordance with an embodiment of the present invention. The working principle of the apparatus shown in Fig. 1 is described in detail in combination with Fig. 2, which shows the basic idea of the present invention.
As shown in Fig. 1, an apparatus 10 for eliminating the intensity variance of a snoring sound signal due to a subject's head movement during sleep is proposed. Specifically, this apparatus 10 comprises a sound detection unit 11, a head posture detection unit 12 and a processing unit 13.
The sound detection unit 11 in Fig. 1 is configured for detecting the intensity of the snoring sound signal of the subject. The head posture detection unit 12 in Fig. 1 is placed on the head of the subject and used for detecting the head posture of the subject at the time the intensity of the snoring sound signal is detected.
As shown in Fig. 2, the sound detection unit 11 is placed at a fixed position. In an embodiment of the present invention, the sound detection unit 11 is a microphone and the head posture detection unit 12 is an accelero meter. The distance between the microphone and the accelerometer should not be too small or too large. If the distance between the microphone and the accelerometer is too small, it may influence a subject's body movement during sleep. If they are too far apart, however, the sound detected may be unclear. Therefore, the distance between the microphone and the accelerometer is usually selected to be about 15cm-30cm in order to get a clear sound and no interference with the subject.
On the other hand, hanging the microphone in front of the head is not convenient, since the subject may touch the microphone when he wants to get out of bed. Therefore, it is better to place the microphone at the side of the bed, as shown in Fig. 2.
Please note that the sound detection unit 11 and the head posture detection unit 12 are not restricted to being a microphone and an accelerometer, respectively. It is easily understood by the skilled in the art that any other sound detection unit and head posture detection unit may be utilized as long as they can detect the snoring sound and the head posture.
As shown in Fig. 2 and as will be easily understood by those skilled in the art, the detected intensity of the snoring sound signal is higher when the subject turns his head to the left and is smaller when the subject turns his head to the right.
The processing unit 13 in Fig. 1 is configured for calibrating the detected intensity of the snoring sound signal in accordance with the detected head posture of the subject.
As for the calibrating process performed by the processing unit 13, it can be performed in many ways. For example, the detected intensity of the snoring sound signal may be calibrated in accordance with the empirical values which have been preset for the head postures. However, this approach may not be accurate enough.
According to an embodiment of the present invention, the processing unit 13 is configured for calibrating the detected intensity of the snoring sound signal by means of the following method.
Specifically, the processing unit 13 may first map the detected head posture of the subject to a pre-built look-up table in order to obtain a factor in the table, which corresponds to the detected head posture, and then the processing unit 13 may calibrate the detected intensity of the snoring sound signal in accordance with the factor obtained.
The look-up table may pre-establish the one-to-one relationship between a factor and each head posture. In a preferred embodiment, to improve the calibration accuracy, the head posture should be identified as clearly as possible.
For example, compared with a look-up table which pre-establishes the one-to-one relationship between a factor and only face up, face turned left or face turned right postures, respectively, it is preferred that the relationship between the factor and each head posture corresponding to each angle within 180°from face turned left to face turned right sleeping postures can be established. In this way, the accuracy of the calibration can be further improved. In the following, a detailed description will be given of how to establish the look-up table.
In an embodiment of the present invention, a standard sound signal of fixed frequency and fixed length was generated and recorded in a device which can both record and reproduce sound. While the subject is lying on the bed, the sound reproduction device will be placed close to the subject's head, first at one site, i.e., the left side close to the bed, and reproduce the sound, and then the device will be moved to another site around the head, and reproduce the sound again. In such a way, the standard sound signal will be reproduced at different sites around the head. By detecting the intensity of the standard sound signal, which is emitted at different positions around the subject's head so as to simulate the snoring sound signal emitted at different head postures of the subject, and normalizing the detected intensity to the actual intensity of the standard sound signal, the factor for each head posture is obtained. It should be noted that the intensity of the standard sound signal is detected by the sound detection unit placed at the same fixed position as where the sound detection unit is placed to detect the snoring sound signal.
The distance intervals between any two sites are equal or not, e.g. 1 radian, 5 radians or 10 radians according to how detailed the look-up table should be established according to the user. In such a way, the relationship between the factor and each head posture could be established.
The researchers have found that the frequency range of a human's snoring sound is normally under 1200Hz, with the peak below 500Hz, and the snoring duration range is 0.3 - 2.3 seconds.
Therefore, in an embodiment of the present invention, the standard sound signal used has a fixed frequency within the range of 300Hz to 500Hz and a fixed duration within the range of 0.3 to 2.3 seconds. In this way, a standard sound signal, which is quite similar to the human snoring sound in terms of sound characteristics, is adopted and therefore the factors in the look-up table can be more reliable and hence the accuracy of the calibration is further improved.
In a further embodiment of the present invention, the fixed frequency is selected to be 320Hz and the fixed duration is selected to be 2 seconds. In practice, since the detected sound signal may be variable due to the head size of different subjects and different environments (or bedrooms) accommodating the subjects, the inventors of the present invention have found that there is no fixed look-up table for various subjects and environments. Therefore, in an embodiment of the present invention, the pre-built look-up table is generated for different subjects at different environments, so that the calibration accuracy can be further improved.
In an embodiment of the present invention, the accelerometer is placed on the forehead of the subject as shown in Fig. 2, so that it is in the same plane as the nose or the mouth of the subject. In this case, the accelerometer may follow the rotation of the nose or mouth where the snoring sound is emitted in a more accurate manner, so that the calibration accuracy can be further improved. In an embodiment of the present invention, although not shown in Fig. 1, the apparatus
10 may further comprise an output unit for outputting the calibrated intensity for snoring analysis.
Fig. 3 is a flowchart of the method of eliminating the intensity variance of the snoring sound signal due to a subject's head movement during sleep in accordance with an embodiment of the present invention.
As shown in Fig. 3, the method 30 comprises a detecting step 31, a detecting step 32 and a calibrating step 33.
First, the intensity of the snoring sound signal of the subject is detected by the sound detection unit 11 , which is placed at a fixed position (step 31).
Further, the head posture of the subject at the time the intensity of the snoring sound signal is detected must be detected (step 32).
Afterwards, the detected intensity of the snoring sound signal is calibrated in accordance with the detected head posture of the subject (step 33).
In accordance with an embodiment of the present invention, the step of calibrating comprises: mapping the detected head posture of the subject to a pre-built look-up table, which pre-establishes the one-to-one relationship between a factor and each head posture; and calibrating the detected intensity of the snoring sound signal in accordance with the factor corresponding to the detected head posture.
Details of the calibrating process will be dispensed with here, since the procedure has been described above in combination with the apparatus of the present invention.
As for how to establish the look-up table, in accordance with a preferred embodiment of the present invention, the pre-built look-up table is generated by the steps of: detecting the intensity of a standard sound signal of fixed frequency and fixed duration, which is emitted at different positions around the subject's head so as to simulate the snoring sound signal emitted at different head postures of the subject; and normalizing the detected intensity to the actual intensity of the standard sound signal, so that a factor for each head posture is obtained, wherein the intensity of the standard sound signal is detected by the sound detection unit placed at said fixed position.
It should be noted that although Fig. 3 shows the flowchart of the method, it is only an illustrative embodiment and the sequence of the steps in the method may be different in other embodiments.
For example, it can be easily understood by those skilled in the art that the detecting step 31 and the detecting step 32 in Fig. 3 may be performed in a reversed sequence.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim or in the description. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. In the system claims enumerating several units, several of these units can be embodied by one and the same item of software and/or hardware. The usage of the words first, second and third, et cetera, does not indicate any ordering. These words are to be interpreted as names.

Claims

CLAIMS:
1. An apparatus for eliminating the intensity variance of a snoring sound signal due to a subject's head movement during sleep, comprising:
a sound detection unit for detecting the intensity of the snoring sound signal of the subject, the sound detection unit being placed at a fixed position;
a head posture detection unit, which is placed on the head of the subject and which is used for detecting the head posture of the subject at the time the intensity of the snoring sound signal is detected; and
a processing unit for calibrating the detected intensity of the snoring sound signal in accordance with the detected head posture of the subject.
2. The apparatus according to claim 1, wherein
the processing unit calibrates the detected intensity of the snoring sound signal by mapping the detected head posture of the subject to a pre-built look-up table, which pre-establishes the one-to-one relationship between a factor and each head posture, and calibrating the detected intensity of the snoring sound signal in accordance with the factor corresponding to the detected head posture, and
wherein the each head posture corresponds to each angle within 180°from face turned left to face turned right sleeping postures.
3. The apparatus according to claim 2, wherein
the pre-built look-up table is generated by detecting the intensity of a standard sound signal of fixed frequency and fixed duration, which is emitted at different positions around the subject's head so as to simulate the snoring sound signal emitted at different head postures of the subject, and normalizing the detected intensity to the actual intensity of the standard sound signal, so that the factor for each head posture is obtained, and wherein
the intensity of the standard sound signal is detected by the sound detection unit placed at said fixed position.
4. The apparatus according to claim 3, wherein
the pre-built look-up table is generated for different subjects at different environments.
5. The apparatus according to claim 3, wherein
the standard sound signal has a fixed frequency within the range of 300Hz to 500Hz and a fixed duration within the range of 0.3 to 2.3 seconds.
6. The apparatus according to claim 1, wherein
the sound detection unit is a microphone,
the head posture detection unit is an accelerometer, and
the distance between the microphone and the accelerometer is about 15cm-30cm.
7. The apparatus according to claim 6, wherein
the accelerometer is placed on the forehead of the subject so that it is in the same plane as the nose or mouth of the subject.
8. The apparatus according to claim 1, further comprising:
an output unit for outputting the calibrated intensity for snoring analysis.
9. A method of eliminating the intensity variance of a snoring sound signal due to a subject's head movement during sleep, comprising:
detecting the intensity of the snoring sound signal of the subject by a sound detection unit, which is placed at a fixed position;
detecting the head posture of the subject at the time the intensity of the snoring sound signal is detected; and
calibrating the detected intensity of the snoring sound signal in accordance with the detected head posture of the subject.
10. The method according to claim 9, wherein the step of calibrating comprises: mapping the detected head posture of the subject to a pre-built look-up table, which pre-establishes the one-to-one relationship between a factor and each head posture; and
calibrating the detected intensity of the snoring sound signal in accordance with the factor corresponding to the detected head posture,
wherein the each head posture corresponds to each angle within 180°from face turned left to face turned right sleeping postures.
11. The method according to claim 10, wherein the pre-built look-up table is generated by the steps of:
detecting the intensity of a standard sound signal of fixed frequency and fixed duration, which is emitted at different positions around the subject's head so as to simulate the snoring sound signal emitted at different head postures of the subject; and normalizing the detected intensity to the actual intensity of the standard sound signal so that a factor for each head posture is obtained,
wherein the intensity of the standard sound signal is detected by the sound detection unit placed at said fixed position.
12. The method according to claim 11, wherein
the pre-built look-up table is generated for different subjects at different environments.
13. The method according to claim 11, wherein
the standard sound signal has a fixed frequency within the range of 300Hz to 500Hz and a fixed duration within the range of 0.3 to 2.3 seconds.
14. The method according to claim 9, wherein
the sound detection unit is a microphone,
the head posture of the subject is detected by an accelero meter, and the distance between the microphone and the accelerometer is about 15cm-30cm.
15. The method according to claim 14, wherein
the accelerometer is placed on the forehead of the subject so that it is in the same plane as the nose or mouth of the subject.
PCT/IB2012/055635 2011-11-02 2012-10-17 An apparatus and a method for eliminating the intensity variance of a snoring sound signal due to a subject's head movement during sleep WO2013064933A2 (en)

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