Voice amplification system and voice amplification method

Abstract

To provide a voice amplification system which resolves a difficulty of exerting a warning effect on an intruder such as a thief and a robber by performing such a warning broadcast that only a determined sound source is amplified for the intruder.SOLUTION: A voice amplification system (1) includes: a speaker (11) for amplifying voice toward a security area; intrusion detection means (21) for detecting an intrusion of an intruder into the security area; and voice amplification control means (30) for responding to the detection of the intruder by the intrusion detection means (21) so as to amplify voice messages for the intruder with the speaker (11). The voice amplification control means (30) plurally amplifies the voice messages having a dramatic effect with time.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to public address systems. [Background technology]

[0002] In modern society, crimes such as theft and robbery occur every year, and the demand for security systems is increasing. For example, in Patent Document 1, the intrusion of a burglar is detected by an infrared sensor or a shock sensor. Then, an alarm sound is output from a speaker and broadcast to the intruder. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-032377 A Summary of the Invention [Problem to be solved by the invention]

[0004] It is difficult to have a threatening effect on intruders such as thieves and robbers by broadcasting a warning broadcast that only amplifies a fixed sound source. Therefore, the present disclosure aims to perform a loudspeaker broadcast that has at least some threatening effect on intruders. [Means for solving the problem]

[0005] The public address system of the present disclosure comprises: A speaker that amplifies the sound towards the security area, an intrusion detection means for detecting an intrusion of an intruder into the security area; a loudspeaker control means for loudspeaking a voice message addressed to the intruder from the speaker in response to the detection of the intruder by the intrusion detection means, The loudspeaker control means loudspeaks a voice message having a dramatic effect a plurality of times with the passage of time.

[0006] The multiple voice messages having a dramatic effect over time may be multiple message voices having a story-like nature that represents a specific scenario. The voice messages are broadcast two or more times with a time interval. Each voice message may be a voice with no meaning or a voice with meaning. The voice with no meaning may be a sound effect. The voice with meaning may be a natural language. The voice message used for a single intruder may be only a voice with no meaning, only a voice with meaning, or a combination of a voice with no meaning and a voice with meaning. It is sufficient that the combination of multiple voice messages used for a single intruder creates a dramatic effect.

[0007] The sound amplification method of the present disclosure further comprises: Detecting an intruder into the security area by an intruder detection means; a voice amplification method for amplifying a voice message addressed to the intruder from a speaker in response to the detection of the intruder by the intruder detection means, The method for amplifying a voice message having a dramatic effect is performed a plurality of times over time. Effect of the Invention

[0008] The loudspeaker system of the present disclosure provides a loudspeaker broadcast with dramatic effect to an intruder who has entered a security area, thereby discouraging the intruder from trying to expand his or her crime. [Brief description of the drawings]

[0009] [Figure 1A] FIG. 1A is a diagram showing the configuration of a loudspeaker system 1 of the first embodiment. [Figure 1B] FIG. 1B is a diagram showing another configuration of the loudspeaker system 1 of the first embodiment. [Figure 1C] FIG. 1C is a diagram showing another configuration of the loudspeaker system 1 according to the first embodiment. [Diagram 2] FIG. 2 is a flowchart showing the sound amplification method of the first embodiment. [Diagram 3] FIG. 3 is a diagram showing a specific example of a series of voice messages of (3-1). [Figure 4] FIG. 4 is a diagram showing a specific example of a series of voice messages in (3-2). [Diagram 5] FIG. 5 is a diagram showing a specific example of a series of voice messages of (3-3). [Figure 6] FIG. 6 is a diagram showing a specific example of a series of voice messages of (3-4). [Figure 7] FIG. 7 is a diagram showing a specific example of a series of voice messages of (3-5). [Figure 8] FIG. 8 is a diagram showing a specific example of a series of voice messages of (3-6). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] 1. First embodiment (1) Configuration of the Public Address System 1 of the First Embodiment The loudspeaker system 1 of the present disclosure is a system that detects an intruder who has illegally entered a security area and broadcasts a loudspeaker message to the intruder. The security area may be a store or an office. Examples of stores include jewelry stores and watch stores.

[0011] The loudspeaker system 1 of the present disclosure includes a speaker 11, an intrusion detection means 21, and a loudspeaker control means 30, as shown in FIG. 1A.

[0012] The intrusion detection means 21 may be a camera, an infrared sensor, a window sensor, or the like. The camera may be a security camera. The imaging range of the camera may be the entire security area, or may be near a door or window that is an entrance to the security area from the outside. The camera may be a video camera. The camera detects an intruder by image sensing. The camera may send the captured image to the loudspeaker control means 30, which may analyze the image and determine the presence or absence of an intruder.

[0013] Infrared sensors are installed near the entrance to security areas. Infrared sensors include an infrared emitting section and an infrared receiving section. The infrared ray is normally allowed to pass between the light emitting section and the light receiving section, and when an intruder passes between the light emitting section and the light receiving section, the infrared ray is blocked and the intrusion is detected.

[0014] Window sensors are installed on windows in security areas and detect the vibrations that occur when the window is opened, closed, or broken to detect the intrusion of an intruder.

[0015] The intrusion detection means 21 is connected to the loudspeaker control means 30 by wire or wirelessly. When the intrusion detection means 21 detects an intrusion of an intruder into the security area, it is transmitted to the loudspeaker control means 30. Alternatively, for example, the intrusion detection means 21 may be a security camera, and the image of the security camera is transmitted to the loudspeaker control means 30, which learns that an intruder has intruded by analyzing the image of the security camera. A person such as a security guard may detect the intrusion of an intruder by judging the image acquired by the intrusion detection means 21 (security camera) and displayed by the loudspeaker control means 30.

[0016] The loudspeaker system 1 of the present disclosure may further include an event detection means 22. The event detection means 22 detects the occurrence of an event within the security area. An event means an act by an intruder, such as destruction of a case containing precious metals or theft. An event may also be called a criminal act. An example of the event detection means 22 is a security camera. The event detection means 22 may be shared with the intrusion detection means 21. In another embodiment, the event detection means 22 may be arranged separately from the intrusion detection means 21, as shown in FIG. 1B.

[0017] The event detection means 22 may be a sound collection device 23 as shown in Fig. 1C. The sound collection device 23 collects sound within the security area. The sound collection device 23 may be a security camera. It is preferable that the sound amplification control means 30 can analyze the sounds of intruders collected by the sound collection device 23 and determine how many intruders were present. It is more preferable that when there are multiple intruders, the sound amplification control means 30 can synthesize sounds similar to the sounds of each intruder and broadcast the sounds from the speaker 11.

[0018] The loudspeaker control means 30 is a computer. The computer includes a processor such as a CPU and a memory. The memory includes a RAM, a ROM, an external storage device, and the like. The memory may store a computer program or a voice message. The memory may store a program for executing the loudspeaker method using the loudspeaker system 1. The processor reads the program from the memory and executes it. The loudspeaker control means 30 is connected to the intrusion detection means 21 and the speakers 11a to 11d by wire or wirelessly. The loudspeaker control means 30 controls the speakers 11a to 11d. The loudspeaker control means 30 is usually placed in a security room or the like of a building including a security area. The loudspeaker control means 30 may be placed in the security area. The loudspeaker control means 30 may be composed of a plurality of computers. For example, a computer that controls the security system of the entire building, a computer that controls the speaker 11, and a computer that receives a signal from the intrusion detection means 21 may be separate computers, and they may be configured to operate in conjunction with each other.

[0019] The speaker 11 is arranged so as to amplify the sound within the security area. There may be one or more speakers 11 for one security area. In the case of FIG. 1, there are four speakers 11a to 11d. The speaker 11 amplifies the voice message under the control of the voice amplification control means 30. The speaker 11 may be an IP speaker. The speaker 11 may include a voice amplification unit and a storage unit. The voice message may be stored in the storage unit.

[0020] The voice message may be stored in a memory unit of each speaker 11 and played back by a command from the loudspeaker control means 30. Alternatively, the voice message may be transmitted from the loudspeaker control means 30 and played back by each speaker 11.

[0021] The speaker 11 may be dedicated to the public address system 1 (dedicated to the security system) or may be a speaker used for other purposes. The speaker 11 may be a part of an emergency broadcast system and may be a speaker for amplifying an emergency broadcast message.

[0022] A plurality of speakers 11 may be provided as shown in Fig. 1. When a plurality of speakers 11 are provided, the same message may be amplified, or different messages may be amplified respectively.

[0023] The speakers 11a to 11d may sequentially broadcast different audio messages. For example, by generating meaningless sound effects and meaningful audio messages from the different speakers 11a to 11d, an intruder may have the illusion that a person is moving around within the security area.

[0024] (2) Sound amplification method using the sound amplification system 1 of the first embodiment A method for amplifying sounds using the sound amplification system 1 of this embodiment will be described with reference to the flowchart of FIG.

[0025] This loudspeaker method is triggered by the intrusion detection means 21 detecting an intrusion of an intruder into the security area (step S101). If the intrusion detection means 21 does not detect an intrusion, the process returns to step S101 again. If the intrusion detection means 21 detects an intrusion, the intrusion detection means 21 notifies the loudspeaker control means 30 that it has detected an intrusion of an intruder into the security area, and the process proceeds to step S102.

[0026] In step S102, the voice amplification control means 30 sends a command to the speaker 11 to amplify a first voice message addressed to the intruder from the speaker 11. Then, after waiting for a predetermined time to elapse (S103), the means 30 causes the speaker 11 to amplify a second voice message addressed to the intruder (S104). Although not shown in the flowchart of FIG. 2, a third voice message, a fourth voice message, a fifth voice message and so on may be sent successively after a predetermined time has elapsed. It is sufficient that the multiple messages create a dramatic effect as a whole. Furthermore, it is preferable that the messages have a story-like quality that represents a specific scenario.

[0027] Various voice messages are possible. Each voice message may be a voice with no meaning or a voice with meaning. The voice with no meaning may be a sound effect. The voice with meaning may be a natural language. A voice message used for a single intruder may be only a voice with no meaning, only a voice with meaning, or a combination of a voice with no meaning and a voice with meaning. It is sufficient that a combination of multiple voice messages used for a single intruder creates a dramatic effect.

[0028] In steps S102 and S104, the voice message to be amplified is the one stored in the memory of the voice amplification control means 30. The voice message to be amplified may be the one recorded in the memory unit of the speaker 11.

[0029] The loudspeaker voice message may be prepared in advance by creating a series of voice messages before an intruder enters the security area, and may be stored in the memory of the loudspeaker control means 30 for use. A plurality of types of voice message series may be prepared. When the intrusion detection means 21 detects an intruder and transmits the detection to the loudspeaker control means 30, the loudspeaker control means 30 selects and executes an appropriate series of voice messages from among the plurality of series of voice messages, which is the most appropriate series of voice messages, depending on the number of intruders, the time of occurrence of the event, the occurrence status of the event, and the like. Alternatively, the loudspeaker control means 30 may use an appropriate series of voice messages by arranging and combining them depending on the occurrence status of the event. Alternatively, the loudspeaker control means 30 may prepare and execute a series of voice messages every time an intruder enters the security area.

[0030] When the first voice message, the second voice message, etc. are successively amplified at a predetermined time interval, each voice message may be amplified from the same speaker 11 or from a different speaker 11. For example, all voice messages may be amplified from all speakers 11. For example, each voice message may be amplified from a different speaker 11 in order. For example, each voice message may be amplified from adjacent speakers 11 in the order in which it is amplified (for example, the first voice message may be amplified from speaker 11a, the second voice message from speaker 11b, the third voice message from speaker 11c, and the fourth voice message from speaker 11d). For example, each voice message may be amplified from a randomly selected speaker 11.

[0031] (3) Specific examples of a series of voice messages A specific example of a series of voice messages will now be described.

[0032] (3-1) A voice message telling a story from the time of the call to the arrival of the police This specific example is composed of the first to seventh voice messages as shown in Fig. 3. Overall, the messages convey to the intruder that an intruder has been detected, the police have been notified, and the police have arrived, regardless of the facts.

[0033] The first voice message is "An abnormality has been detected. An abnormality will be reported." By amplifying the first voice message, the intruder is warned that an intrusion has been detected, and further, that a report has been made to the police or the like.

[0034] An audible alarm may or may not be sounded in the security area together with the first voice message. If the first voice message is amplified together with the audible alarm, it will provide a double warning to intruders, and the warning that a report has been made will contain information that would not be conveyed to intruders by the audible alarm alone.

[0035] Next, a meaningless sound effect of "clack" is generated as the second voice message. This sound effect is not intended to mean anything in particular, but is intended to suggest that there is a person in the room and that the person has moved. Alternatively, the sound effect may be a sound effect indicating that a person is opening and closing a door in a security area.

[0036] Next, the third voice message is the "shutter sound" of a camera. This sound is intended to indicate that a camera is installed in the security area and that the camera is taking pictures of intruders by human operation or remote control. The third voice message is a meaningful sound effect.

[0037] Following the third voice message, the fourth voice message is "A photo of the scene has been sent. Please check the scene." The fourth voice message is intended to clarify the meaning of the third voice message and to warn the intruder that a photo has been taken. Regardless of whether a photo of the security area has actually been taken or not, the third and fourth voice messages are amplified to scare off the intruder. More generally, the third and fourth voice messages are amplified as voice messages that are short, meaningless sound effects, and then, after a predetermined time has elapsed, a voice message containing natural language that expresses a situation related to the sound effects is amplified.

[0038] The fifth voice message is "Five minutes have passed since the abnormality was detected." The fifth voice message is amplified after a predetermined time, shorter than five minutes, has elapsed after the first voice message. The predetermined time is, for example, two minutes. In this way, false information is broadcast to the intruder that a longer time has passed than actually has, giving the intruder the illusion that a longer time has passed than actually has.

[0039] The sixth audio message is a "siren sound," which alerts intruders to the approach of police.

[0040] The seventh voice message is, "Arrived on scene. Patrol commencing. Come on in." This, along with the sixth voice message, indicates that police have arrived and are approaching the security area. The sixth and seventh voice messages are broadcast regardless of the facts. Their purpose is to warn potential perpetrators. The sixth and seventh voice messages are used in conjunction with the first voice message.

[0041] In this specific example, among the first to seventh voice messages, the first, fourth, fifth and seventh voice messages are natural language messages. They are spoken by a person. Or, they are synthesized to imitate a human voice. In contrast, the second, third and sixth voices are sounds generated by the movement of an object, or sounds that were originally musical instruments such as a siren, or sounds that were created to imitate such instruments.

[0042] The first to seventh voice messages may be amplified from the same speaker 11, as described above, or may be amplified from different speakers 11, respectively.

[0043] (3-2) Sound messages that mainly consist of meaningless sound effects and meaningful sounds This specific example is composed of first to fifth voice messages as shown in Fig. 4. The voice messages are mainly composed of meaningless sound effects and meaningful sounds.

[0044] The first to third voice messages are exactly the same as in case (3-1). However, the "shutter sound" in the third voice message is used together with the fourth voice message in case (3-1) as a meaningful sound effect. However, in this specific example, it is used independently of the other messages as a meaningless sound effect. However, the "shutter sound" in the third voice message may also be understood as a meaningful sound. (In other words, it is a message to the intruder that a photo of the intruder has been taken.)

[0045] As the fourth voice message, a meaningless sound effect of "clack" is played. Like the second voice message, this does not have any particular intention, but it is reminiscent of a person in the room and that person moving. The fifth voice message is the "sound of a door opening and closing." The fifth voice message may be interpreted as a meaningful sound.

[0046] In this specific example, the first voice message is a natural language message, and the second to fifth voice messages are meaningless sound effects or meaningful sounds. By repeating meaningless sound effects or meaningful sounds like the second to fifth voice messages, a warning is continuously sent to the intruder that someone is constantly watching.

[0047] The first to fifth voice messages may be amplified from the same speaker 11, as described above, or may be amplified from different speakers 11, respectively.

[0048] In this way, by alternating between meaningless sound effects (the second and fourth voice messages) and meaningful sound effects (the third and fifth voice messages), it is possible to give the intruder a psychological sense of discomfort and anxiety.

[0049] (3-3) Voice messages to inform police of their gradual approach using location and map information The series of voice messages in this example notifies the police and conveys the police's gradual approach using location information, as shown in Figure 5. In other words, taking into consideration the location of the security area, the points where the police will pass on their way from the police station to the security area are broadcast to the intruder as voice messages in stages, providing a realistic warning to the intruder.

[0050] The series of voice messages may be created in advance based on the position information of the security area and map information of the vicinity of the security area, and may be stored in the memory of the loudspeaker control means 30.

[0051] Alternatively, the location information of the security area and map information around the security area may be stored in the memory of the loudspeaker control means 30, and in response to the occurrence of an event in the security area, the loudspeaker control means 30 may create and use a series of voice messages.

[0052] The map information includes location information of the security area and location information of one or more landmark locations (buildings, stores, public institutions, private companies, etc.) in the vicinity.

[0053] In either case, the location of the police broadcast in the series of voice messages is not related to the actual location of the police. In either case, it is preferable to update map information around the security area to the latest information and to update the voice messages based on the latest map information.

[0054] In the series of messages in FIG. 5, the location of the security area is set to be the Takarazuka office of TOA Corporation in Takarazuka city, Hyogo prefecture.

[0055] In FIG. 5, the first voice message is "An abnormality has been detected. We will report it." This is the same as the cases (3-1) and (3-2). The second voice message is "Patrol team. Rush immediately. Currently near Special Nursing Home AAA." This is an example in which "Special Nursing Home AAA," a landmark in the vicinity of the location of the TOA Corporation Takarazuka Office, is selected based on map information of Takarazuka City, Hyogo Prefecture, and the second voice message is a voice message including the voice of "Special Nursing Home AAA." The third voice message is "Support from Mukogawa Police Box. We will arrive at the TOA Takarazuka Office shortly." This is an example in which "Mukogawa Police Box," a landmark in the vicinity of the location of the TOA Corporation Takarazuka Office, is selected based on map information of Takarazuka City, Hyogo Prefecture, and the third voice message is a voice message including the voice of "Mukogawa Police Box." For example, the landmark related to the third voice message ("Mukogawa Police Box") may be selected from landmarks closer to the location of the Takarazuka Office of TOA Corporation than the landmark related to the second voice message ("Nursing Home AAA"). For example, the landmark related to the third voice message ("Mukogawa Police Box") may be selected from landmarks located on a route different from the route from the landmark related to the second voice message ("Nursing Home AAA") to the Takarazuka Office of TOA Corporation. For example, the landmark related to the third voice message ("Mukogawa Police Box") may be selected from landmarks located in a direction different from the direction of the landmark related to the second voice message ("Nursing Home AAA") from the location of the Takarazuka Office of TOA Corporation. The second and third voice messages incorporate specific place names to realistically inform the intruder that the police are approaching. The fourth voice message is "Patrol team will arrive shortly. Be on alert," and the fifth voice message is "siren sound." The first to fourth voice messages are amplified at appropriate time intervals, so that an intruder can be warned with a sense of realism that the police are approaching.

[0056] (3-4) A voice message that identifies the nature of the crime and informs the offender of the criminal punishment according to the nature of the crime As shown in FIG. 6, the series of voice messages in this example are intended to grasp the nature of the crime and, as the crime progresses, inform the intruder of criminal penalties appropriate to the nature of the crime.

[0057] For this purpose, the event detection means 22 installed in the security area continuously detects the nature of the crime and transmits it to the loudspeaker control means 30. The loudspeaker control means 30 stores a criminal penalty database in its memory. The criminal penalty database is a table showing which crime corresponds to which penalty. The loudspeaker control means 30 refers to the criminal penalty database according to the crime nature detected by the event detection means 22, learns the criminal penalty, and loudspeaks the crime nature and the criminal penalty as an audio message from the speaker 11 to the intruder.

[0058] The first voice message in FIG. 6 is the same as the cases (3-1) to (3-3). The second voice message is "You're committing trespass. Are you prepared to serve three years in prison?" The third voice message is "You committed theft in addition to vandalism? You could get up to 10 years in prison! Are you still going to do it?!" The fourth voice message is "What are you planning on doing by threatening someone? Your sentence will be extended even more, isn't it?!" The second to fourth voice messages warn the intruder of the crime type detected by the event detection means 22 and the corresponding criminal penalty. This shows an example in which the event detection means 22 detects the crime type of trespass, then the crime types of vandalism and theft, and then the crime type of threat over time, and accordingly selects the second to fourth voice messages which read out the criminal penalty associated with each crime type in sequence. By broadcasting voice messages detailing criminal penalties according to the type of crime, it is expected that the effect of discouraging intruders from committing increasingly more crimes can be expected.

[0059] (3-5) Detect multiple intruders and send voice messages to cause conflict among them In this specific example, when there are multiple intruders, the voice of each intruder is acquired and a voice message using a voice similar to that of the acquired individual intruder is broadcast over loudspeakers, causing the intruders to mistakenly believe that the words were spoken by another intruder, with the aim of causing rifts between the intruders.

[0060] Specifically, as shown in Figure 7, the first voice message imitates the voice of one of the intruders and says, "I'm keeping all the money for myself! I'll kill my friends." Next, the second voice message imitates the voice of another intruder and says, "This is bad, I can't do this. Let's stop now. I'm getting off."

[0061] For example, the loudspeaker control means 30 or the speaker 11 holds a plurality of voice messages obtained by sampling the voices of different speakers for the first voice message. For example, the loudspeaker control means 30 or the speaker 11 holds a plurality of voice messages obtained by sampling the voices of different speakers for the second voice message. The loudspeaker control means 30 analyzes the voice of one criminal collected by the sound collection device 23, and selects and loudspeaks the first voice message and the second voice message sampled with a voice closest to the voice of the criminal. The first voice message and the second voice message may be selected based on the analysis result of the voice of the same criminal, or the first voice message sampled with a voice closest to the voice of one criminal and the second voice message sampled with a voice closest to the voice of the other criminal may be selected based on the analysis result of the voices of different criminals.

[0062] In this specific example, the intended effect is to mislead the intruders into believing that the words were spoken by another intruder among multiple intruders, causing rifts between the intruders and resulting in the failure of the crime.

[0063] (3-6) Voice message disguised as a fire The series of messages in this example are voice messages disguised as a fire, which has not actually occurred, in order to confuse the intruder by making him believe that a fire has broken out.

[0064] In this specific example, the loudspeaker system 1 may include an emergency broadcast facility. In other words, if emergency broadcast facilities for fires and the like can be used as a part of the loudspeaker system 1, the sensor alarm messages, fire broadcast messages, and the like stored in the emergency broadcast facility may be used as they are.

[0065] However, when no actual fire has occurred, it may be difficult to use emergency broadcast equipment to broadcast a false fire announcement, both from a legal and equipment operational standpoint.

[0066] Therefore, in such a case, the public address system 1 may be configured independently of the emergency broadcast equipment, and sensor alarm messages, fire broadcast messages, etc. may be created to be identical to or similar to the messages stored in the emergency broadcast equipment and stored in the memory of the public address control means 30.

[0067] FIG. 8 shows an example of a voice message in this specific example. The first voice message is "The fire detector on the XX floor has just been activated. An attendant is checking it, so please pay attention to the next announcement." The first voice message is a detector alarm broadcast message stored in the emergency broadcast equipment. After the first voice message is amplified, the second voice message is amplified after an appropriate time has elapsed. The second voice message is "There's a fire! There's a fire on the XX floor. Please remain calm and evacuate." The second voice message is a fire broadcast message stored in the emergency broadcast equipment. In addition to the first and second voice messages, a voice message such as "siren" may be broadcast together with the first and second voice messages or separately from the first and second voice messages.

[0068] (4) Summary of the First Embodiment The public address system 1 of this embodiment comprises a speaker 11 that amplifies a sound toward the security area, intrusion detection means 21 that detects the intrusion of an intruder into the security area, and public address control means 30 that causes the speaker 11 to amplify an audio message addressed to the intruder in response to the detection of the intruder by the intrusion detection means 21. The public address system 1 may further comprise event detection means 22 that detects the occurrence of an event within the security area. The event detection means 22 may also serve as the intrusion detection means 21.

[0069] The method of amplifying sounds using the public address system 1 of this embodiment is as follows. First, the intrusion of an intruder into the security area is detected by the intrusion detection means 21 (S101). Next, in response to the detection of the intruder by the intrusion detection means 21, a voice message addressed to the intruder is amplified multiple times from the speaker 11 (S102, S104). The multiple voice messages are multiple voice messages that have a dramatic effect over time. The multiple voice messages may have a story-like quality according to a scenario.

[0070] The multiple voice messages used in this embodiment have a dramatic effect, and therefore can effectively warn intruders. Compared to a simple warning, this has a greater crime deterrent effect on intruders. [Industrial Applicability]

[0071] The public address system of the present disclosure is applicable to a security system. [Explanation of symbols]

[0072] 1 Public address system 11 Speakers 21 Intrusion detection methods 22 Event detection methods 23 Sound recording device 30 Amplification control means

Claims

1. A speaker that amplifies the sound towards the security area, an intrusion detection means for detecting an intrusion of an intruder into the security area; a loudspeaker control means for loudspeaking a voice message addressed to the intruder from the speaker in response to the detection of the intruder by the intrusion detection means, The loudspeaker control means loudspeaks a voice message having a dramatic effect a plurality of times over time in a loudspeaker system.

2. 2. The loudspeaker system according to claim 1, wherein said loudspeaker control means loudspeaks a voice message which is a meaningless sound effect, and then, after a predetermined time has elapsed, loudspeaks a voice message which has meaning.

3. 3. The loudspeaker system according to claim 2, wherein the loudspeaker control means loudspeaks, after the meaningful voice message, a voice message which is a short, meaningless sound effect, which is the same as or different from the meaningful sound effect voice message, and then, after a predetermined time has elapsed, loudspeaks a meaningful voice message which is the same as or different from the meaningful voice message.

4. 2. The loudspeaker system according to claim 1, wherein the loudspeaker control means loudspeaks a voice message which is a short, meaningless sound effect, and then, after a predetermined time has elapsed, loudspeaks a voice message which includes natural language expressing a situation related to the sound effect.

5. 2. The public address system according to claim 1, wherein said public address control means amplifies a voice message representing a sound, and then, after a predetermined time has elapsed, amplifies a voice message representing a camera shutter sound.

6. 2. The loudspeaker system according to claim 1, wherein the loudspeaker control means loudspeaks a voice message indicating that an intrusion of an intruder has been detected, and then, after a predetermined time has elapsed, loudspeaks a voice message indicating the passage of a longer time than an actual elapsed time.

7. the loudspeaker control means sequentially loudspeaks a plurality of voice messages each having a story characteristic representing a specific scenario; The public address system of claim 1 , wherein the scenario is that a report is made regarding the detection of an intruder, and then, based on the report, a third party is approaching the security area.

8. The public address system according to claim 7 , wherein the scenario is one in which a third party approaches a landmark near the security area based on location information of the security area.

9. further comprising an event detection means for detecting an occurrence of an event within the security area; The loudspeaker control means determines a manner in which the intruder has committed a crime based on the detection of the event by the event detection means, The loudspeaker control means acquires information regarding criminal penalties corresponding to the type of crime, 2. The public address system according to claim 1, wherein said public address control means amplifies a plurality of voice messages informing said intruder of a corresponding criminal penalty based on the type of crime detected over time.

10. The loudspeaker control means determines the number of intruders based on the detection by the intrusion detection means, 2. The loudspeaker system according to claim 1, wherein, when there are a plurality of intruders, said loudspeaker control means loudspeaks a plurality of message voices intended to cause conflict among the intruders.

11. Further comprising a sound collection device for collecting sound within the security area, 11. The loudspeaker system according to claim 10, wherein when the loudspeaker control means is able to pick up the voice of one of the plurality of intruders, the loudspeaker control means generates and loudspeaks a message voice by a synthetic voice similar to the picked-up voice.

12. an event detection means for detecting an event within the security area; The speaker and an emergency broadcasting system for amplifying an emergency broadcasting message from the speaker in response to a notification signal from an automatic fire alarm system are further provided. The emergency broadcast message includes a detector alarm broadcast message and a fire broadcast message, 2. The public address system according to claim 1, wherein the loudspeaker control means loudspeaks a sensor alarm broadcast related to the sensor alarm broadcast message and, following the sensor alarm broadcast, a fire broadcast related to a fire broadcast message, regardless of the alarm transfer signal.

13. The speaker is a plurality of speakers, 2. The public address system according to claim 1, wherein said public address control means causes different voice messages to be sequentially publicized from different speakers over time.

14. Detecting an intruder into the security area by an intruder detection means; a voice amplification method for amplifying a voice message addressed to the intruder from a speaker in response to the detection of the intruder by the intruder detection means, The sound amplification method includes amplifying a voice message having a dramatic effect a plurality of times over time.

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