Active electronic noise suppression system and method for reducing snoring noise

• US 5,844,996 A
• Filed: 05/30/1997
• Issued: 12/01/1998
• Est. Priority Date: 02/04/1993
• Status: Expired due to Fees

• Current Assignee: Sleep, Inc.
• Original Assignee: Sleep Solutions, Inc. (BioSerenity SAS)
• Inventors: Karakasoglu, Ahmet, Abbott, James S., Enzmann, Dieter, Hung, Chin N., Matouk, Anthony F.
• Primary Examiner(s): Kuntz, Curtis A.
• Assistant Examiner(s): LEE, PING
• Application Number:
  US08/866,378
• Time in Patent Office: 550 Days
• Field of Search: 381/71, 381/94, 381/71.6, 381/71.7, 381/71.11, 381/71.12, 381/71.1, 381/72
• US Class Current: 381/71.6
• CPC Class Codes: A47C 21/003 Lighting, radio, telephone or the like connected to the bedstead
• CPC Class Codes: A61B 5/7475 User input or interface means, e.g. keyboard, pointing device, joystick
• CPC Class Codes: A61F 5/56 Devices for preventing snoring by influencing the respiratory system by gas treatment A61M16/00
• CPC Class Codes: G10K 11/17817 between the output signals and the error signals, i.e. secondary path
• CPC Class Codes: G10K 11/17825 Error signals
• CPC Class Codes: G10K 11/17837 by retaining part of the ambient acoustic environment, e.g. speech or alarm signals that the user needs to hear
• CPC Class Codes: G10K 11/17854 the filter being an adaptive filter
• CPC Class Codes: G10K 11/17857 Geometric disposition, e.g. placement of microphones
• CPC Class Codes: G10K 11/17881 the reference signal being an acoustic signal, e.g. recorded with a microphone
• CPC Class Codes: G10K 2210/116 Medical; Dental
• CPC Class Codes: G10K 2210/12 Rooms, e.g. ANC inside a room, office, concert hall or automobile cabin
• CPC Class Codes: G10K 2210/3221 Headrests, seats or the like, for personal ANC systems
• CPC Class Codes: G10L 21/0208 Noise filtering

Abstract

A system for attenuating noise which can be sensed by the auditory nerve comprising a microphone positioned in a first sound region for sensing noise present in the first sound region for creating a first electrical signal having a frequency and amplitude corresponding to the noise sensed in the first sound region. Circuitry is provided for processing the first electrical signal to create a second electrical signal having the same frequency but of opposite amplitude and sign of the first electrical signal. A speaker is provided for converting the second electrical signal to anti-noise for attenuation of the sensed noise in a second sound region spaced from the first sound region. A microphone is disposed in the second sound region for detecting any noise above a predetermined noise level in the second sound region to provide an error correction signal. Circuitry is provided responsive to the error correction signal to modify the second electrical signal to bring the noise in the second sound region so that it is below a predetermined noise level.

Claims

1. A system for use by first and second human beings as bed partners lying in a bed for attenuating noise emanating from the airway of the first human being which can be sensed by the auditory nerves of the second human being, the second human being having a head with first and second ears comprising a modeling noise source, first electromechanical means positioned in a first sound region for sensing involuntary snoring noise emanating from the airway of the first human being for creating a first electrical signal having a frequency and amplitude corresponding to the snoring noise sensed in the first sound region, first electrical means for processing the first electrical signal to create a second electrical signal having the same frequency and opposite phase of the first electrical signal and second electromechanical means including first and second speakers in the vicinity of each of the ears of the second human being for converting the second electrical signal to anti-snoring noise for attenuation of the involuntary snoring noise emanating from the airway of the first human being and present in the vicinity of the ears of the second human being, third electromechanical means mounted on the head of the second human being and including a first error microphone located near the first ear and a second error microphone located near the second ear of the second human being for detecting any noise above a predetermined noise level in the vicinity of the first and second ears of the second human being to provide first and second error correction signals and means responsive to the first and second error correction signals to modify the second electrical signal to bring the involuntary snoring noise in the vicinity of the first and second ears of the second human being so that the involuntary snoring noise is below the predetermined noise level, said first electrical means including modeling means using the source of modeling noise for learning the four acoustical transfer of functions versus frequency between the first and second error microphones and the first and second speakers and producing modeling outputs and noise cancellation means utilizing the modeling outputs to generate anti-noise in the first and second speakers.

2. A system as in claim 1 wherein said processing means includes means for learning from the first electrical signal and predicting in real time a subsequent first electrical signal to create the second electrical signal.

3. A system as in claim 2 wherein said processing means includes means for ascertaining whether there is any error between the predicted first electrical signal and the actual first electrical signal, and means for making a correction in the first electrical signal in accordance with any error ascertained to thereby enhance the capability of predicting in real time a subsequent first electrical signal to be utilized in creating the second electrical signal.

4. A system as in claim 1 wherein said means for processing the first electrical signal to create a second electrical signal includes a variable phase network.

5. A system as in claim 1 wherein said means for processing the first electrical signal to create a second electrical signal includes an analog neural network.

6. A system as in claim 1 wherein said means for processing the first electrical signal to create a second electrical signal includes an A/D converter, a processor connected to the A/D converter and a D/A converter connected to the processor.

7. A system as in claim 6 wherein said processor is a digital signal processor.

8. A system as in claim 6 wherein said processor is a digital neural network.

9. A system as in claim 1 wherein said noise cancellation means includes first and second noise cancellers coupled respectively to the first and second speakers.

10. A method for attenuating involuntary snoring noise emanating from the airway of a first human being as a bed partner sleeping in a bed with a second human being as a second bed partner, the second human being having a head with first and second ears, comprising sensing in the vicinity of the airway of the first human being the involuntary snoring noise emanating from the airway of the first human being, creating a first electrical signal having a frequency and amplitude corresponding to the involuntary snoring noise, processing the first electrical signal to create a second electrical signal having the same frequency and opposite phase of the first electrical signal, converting the second electrical signal to anti-snoring noise to attenuate the involuntary snoring noise present at the first and second ears of the second human being, detecting in close proximity to the first and second ears of the second human being any involuntary snoring noise above a predetermined noise level to provide electrical error correction signals to modify the second electrical signal to bring the involuntary snoring noise present at the first and second ears of the second human being to a level so that it is below the predetermined noise level, said processing of the first electrical signal including utilizing a source of white noise to ascertain the acoustical transfer functions between the detecting in close proximity to the first and second ears of the second human being and the delivery of anti-snoring noise into the vicinity of the first and second ears of the second human being and utilizing the acoustical transfer of functions to generate anti-noise in the vicinity of the first and second ears of the second human being.

11. A method as in claim 10 wherein said processing step includes the steps of learning from the first electrical signals and predicting in real time a subsequent first electrical signal to create the second electrical signal.

12. A method as in claim 10 together with the steps of ascertaining whether there is any error between the predicted subsequent first electrical signal and the actual first electrical signal in making a correction in the first electrical signal in accordance with the error ascertained and thereby enhance the capability of predicting in real time a subsequent first electrical signal.