Methods and apparatus for acoustic event detection

• US 9,218,728 B2
• Filed: 02/02/2012
• Issued: 12/22/2015
• Est. Priority Date: 02/02/2012
• Status: Active Grant

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Bickel, Brady R., Cole, Robert J., Roberts, Megan J., Glick, Bryan D., Staph, Jason A., James, David C., Comi, Gabriel D., Schadler, Stephen
• Primary Examiner(s): Chin, Vivian
• Assistant Examiner(s): ODUNUKWE, UBACHUKWU A
• Application Number:
  US13/364,862
• Publication Number:
  US 20130202120A1
• Time in Patent Office: 1,419 Days
• Field of Search: 381/56, 381/58, 340/605, 340/500, 704/275, 704/256.1, 704/254, 704/246, 704/241, 704/236, 704/235, 704/233, 704/205, 367/124, 345/169, 846/08, 846/68, 846/16, 846/09, 846/12
• US Class Current: 1/1
• CPC Class Codes: G01S 5/20 Position of source determined by a plurality of spaced direction-finders
• CPC Class Codes: G01S 5/22 Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements G01S5/28 takes precedence
• CPC Class Codes: G08B 13/1672 using sonic detecting means, e.g. a microphone operating in the audio frequency range
• CPC Class Codes: G10H 2210/00 Aspects or methods of musical processing having intrinsic musical character, i.e. involving musical theory or musical parameters or relying on musical knowledge, as applied in electrophonic musical tools or instruments processing aspects without intrinsic musical character G10H2250/00
• CPC Class Codes: G10H 2210/041 based on mfcc [mel -frequency spectral coefficients]
• CPC Class Codes: H04R 2410/00 Microphones
• CPC Class Codes: H04R 2499/11 Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
• CPC Class Codes: H04R 3/00 Circuits for transducers , loudspeakers or microphones

Abstract

Methods and apparatus to identify a type of acoustic event Mel Frequency Cepstral Coefficients (MFCCs). In one embodiment, received sound is processed using the MFCCs to locate a peak for comparison with a stored event to determine if the peak corresponds to the acoustic event.

Claims

1. A method to identify a type of acoustic event, comprising:

receiving sound;

using the received sound to generate Mel Frequency Cepstral Coefficients (MFCCs);

processing, using a computer processor, the received sound using the MFCCs to locate a peak;

comparing the peak to a stored event to determine if the peak corresponds to the acoustic event; and

generating an indication that the acoustic event has been detected.

2. The method according to claim 1, wherein the acoustic event comprises a gunshot.

3. The method according to claim 1, further including controlling a microphone based on the amplitude of an expected type of acoustic event.

4. The method according to claim 1, further including performing geolocation processing for the acoustic event.

5. The method according to claim 1, wherein the step comparing the peak to a stored event is performed by a mobile device, which received the sound.

6. The method according to claim 1, further including establishing an ad hoc network with other mobile devices to correlate and geolocate the acoustic event.

7. An article, comprising:

a non-transitory computer readable medium having stored instructions that enable a machine to identify a type of acoustic event by;

using received sound to generate Mel Frequency Cepstral Coefficients (MFCCs);

processing the received sound using the MFCCs locate a peak;

comparing the peak to a stored event to determine if the peak corresponds to the acoustic event; and

generating an indication that the acoustic event has been detected.

8. The article according to claim 7, wherein the acoustic event comprises a gunshot.

9. The article according to claim 7, further including instructions for controlling a microphone based on the amplitude of an expected type of acoustic event.

10. The article according to claim 7, further including instructions for performing geolocation processing for the acoustic event.

11. The article according to claim 7, wherein the step comparing the peak to a stored event is performed by a mobile device, which received the sound.

12. The article according to claim 7, further including instructions for establishing an ad hoc network with other mobile devices to correlate and geolocate the acoustic event.

13. A system, comprising:

a means for generating Mel Frequency Cepstral Coefficients (MFCCs) from received sound

a processing means including a computer processor to process the received sound using the MFCCs locate a peak;

a comparison means to compare the peak to a stored event to determine if the peak corresponds to the acoustic event; and

generator means to generate an indication that the acoustic event has been detected.

14. A system to identify a type of acoustic event, comprising:

a memory and a processor configured to;

generate Mel Frequency Cepstral Coefficients (MFCCs) from received sound;

locate a peak in the received sound using the MFCCs;

compare the peak to a stored event to determine if the peak corresponds to the acoustic event; and

generate an indication that the acoustic event has been detected.