Glass breakage detection system and method

Patent metadata

Field	Value
Publication number	US-9384641-B2
Application number	US-201414501398-A
Country	US
Kind code	B2
Filing date	Sep 30, 2014
Priority date	Sep 30, 2014
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

A method for detecting a glass breakage event, the method including, responsive to receiving a plurality of acoustic event indications associated with an acoustic event, ascertaining whether the plurality of acoustic event indications together indicate a random nature of at least part of the acoustic event, thereby ascertaining that the acoustic event corresponds to a glass breakage event.

First claim

The invention claimed is:

1. A method for detecting a glass breakage event, said method comprising:
responsive to receiving a plurality of acoustic event indications associated with an acoustic event, ascertaining whether said plurality of acoustic event indications together indicate a random nature of at least part of said acoustic event; and
responsive to said ascertaining that said plurality of acoustic event indications together indicate a random nature of at least part of said acoustic event, ascertaining that said acoustic event corresponds to a glass breakage event;
wherein said ascertaining, whether said plurality of acoustic event indications together indicate a random nature of at least part of said acoustic event comprises transforming said plurality of acoustic event indications into a virtual surface function representing a frequency distribution of said acoustic event and ascertaining a randomness of said virtual surface function representing said frequency distribution of said acoustic event.

2. A method for detecting a glass breakage event according to claim 1 and wherein each acoustic event indication of said plurality of acoustic event indications comprises at least:
an amplitude of a sound wave associated with said acoustic event indication;
a frequency of a sound wave associated with said acoustic event indication; and
a point in time at which said acoustic event indication occurred.

3. A method for detecting a glass breakage event according to claim 1 and wherein each of said plurality of acoustic event indications is associated with one of:
a sound wave corresponding to the smashing of a glass pane;
a sound wave corresponding to the cracking of a glass pane; and
a sound wave corresponding to the falling of glass debris.

4. A method for detecting a glass breakage event according to claim 3 and wherein said random nature of at least part of said acoustic event corresponds to a random nature of at least one of said sound wave corresponding to said falling of glass debris and said sound wave corresponding to the cracking of a glass pane.

5. A glass breakage detection system, said system comprising:
random acoustic event analyzing functionality operable for:
ascertaining, responsive to receiving a plurality of acoustic event indications associated with an acoustic event, whether said plurality of acoustic event indications together indicate a random nature of at least part of said acoustic event; and
responsive to said ascertaining that said plurality of acoustic event indications together indicate a random nature of at least part of said acoustic event, ascertaining that said acoustic event corresponds to a glass breakage event;
wherein said ascertaining whether said plurality of acoustic event indications together indicate a random nature of at least part of said acoustic event comprises transforming said plurality of acoustic event indications into a virtual surface function representing a frequency distribution of said acoustic event and ascertaining a randomness of said virtual surface function representing said frequency distribution of said acoustic event.

6. A glass breakage detection system according to claim 5 and also comprising acoustic event indication receiving functionality operable for receiving said plurality of acoustic event indications associated with said acoustic event.

7. A glass breakage detection system according to claim 5 and wherein each acoustic event indication of said plurality of acoustic event indications comprises at least:
an amplitude of a sound wave associated with said acoustic event indication;
a frequency of a sound wave associated with said acoustic event indication; and
a point in time at which said acoustic event indication occurred.

8. A glass breakage detection system according to claim 5 and wherein each of said plurality of acoustic event indications is associated with one of:
a sound wave corresponding to the smashing of a glass pane;
a sound wave corresponding to the cracking of a glass pane; and
a sound wave corresponding to the falling of glass debris.

9. A glass breakage detection system according to claim 8 and wherein said random nature of at least part of said acoustic event corresponds to a random nature of at least one of said sound wave corresponding to said falling of glass debris and said sound wave corresponding to the cracking of a glass pane.

Assignees

• Tyco Fire & Security Gmbh

Inventors

• Zhevelev Boris

Classifications

• H04R29/00

  Monitoring arrangements; Testing arrangements {(for hearing aids H04R25/30; detection of loudspeaker connection H04R5/04; sound-field adaptation dependent on speaker detection H04S7/308)} · CPC title

• G08B13/04 Primary

  by breaking of glass · CPC title

• G08B13/1672

  using sonic detecting means, e.g. a microphone operating in the audio frequency range · CPC title