Acoustic monitoring system and automatic fire alarm system

Abstract

An acoustic surveillance system is obtained that has the function of identifying the location of a person within a monitored area based on acoustic signals picked up by multiple microphones. [Solution] The system comprises multiple microphones that capture sounds generated in the monitored area as acoustic signals, broadcasting equipment that makes announcements via multiple speakers to prompt voice generation when a person confirmation command is received, and a controller that determines whether or not there is a person in the monitored area based on each acoustic signal. The controller outputs a person confirmation command when a situation arises in which it is desired to determine whether or not there is a person in the monitored area, and promotes the capture of acoustic signals by the multiple microphones. In response to the output of the person confirmation command, the controller determines that there is a person in the monitored area if there are two or more acoustic signals with frequency levels within the allowable frequency difference range for each acoustic signal captured by the multiple microphones.

Claims

1. Multiple microphones are installed at predetermined fixed positions within the monitored area to capture sounds generated in the monitored area as acoustic signals. A broadcasting system that, upon receiving a person identification command, broadcasts an announcement via multiple speakers to prompt people within the monitored area to speak, A controller that determines whether or not there is a person in the monitored area based on the acoustic signals picked up by each of the multiple microphones. Equipped with, The aforementioned controller, When a situation arises in which it is necessary to determine whether or not a person is present within the monitored area, the person confirmation command is output, and the acquisition of the acoustic signal by the multiple microphones is facilitated. In response to the output of the aforementioned person identification command, if there are two or more acoustic signals with frequency levels within a predetermined permissible frequency difference range for each of the acoustic signals picked up by the multiple microphones, it is determined that the voice signals of the same person are included in the two or more acoustic signals, and therefore a person is present within the monitored area. Acoustic monitoring system.

2. The aforementioned controller, The attribute information of the person is estimated from the magnitude of the frequency level contained in the voice signal of the same person. The acoustic monitoring system according to claim 1.

3. The aforementioned controller, If information regarding the location of the fire source within the monitored area is obtained, an announcement prompting the activation of the voice will be played sequentially from the speaker closest to the fire source location. The acoustic monitoring system according to claim 1 or 2.

4. An automatic fire alarm system incorporating the acoustic monitoring system described in claim 1 or 2, The aforementioned automatic fire alarm system comprises a plurality of fire detectors, an emergency broadcasting panel, and a fire alarm receiver. In the aforementioned acoustic monitoring system, The aforementioned multiple microphones are either installed as individual devices or consist of microphones built into each of the aforementioned multiple fire detectors. The aforementioned broadcasting equipment consists of the aforementioned emergency broadcasting panel connected to a plurality of speakers, The controller is incorporated into the fire alarm receiver. Automatic fire alarm system.

5. The aforementioned fire alarm receiver is The location of the fire source is identified based on fire signals collected from multiple fire detectors installed in predetermined locations. The person identification command is output to cause the speaker closest to the identified fire source location to sequentially make the announcement prompting the generation of the sound, In response to the output of the aforementioned person identification command, if, with respect to the acoustic signals picked up by the multiple microphones, there are two or more acoustic signals whose frequency levels are within a predetermined permissible frequency difference range, it is determined that the voice signals of the same person are included in the two or more acoustic signals, and therefore a person is present within the monitored area. The attribute information of the person located within the monitored area is estimated from the magnitude of the frequency level contained in the voice signal of the same person. The automatic fire alarm system according to claim 4.

Images