JP2005352838A - Warning sound communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a warning sound transmission system which uses a sensor for raising an alarm to bring out an abnormality detection signal and transmits it to a monitoring device. <P>SOLUTION: The warning sound transmission system comprises at least one sensor 3, 5 which detects the occurrence of a predetermined abnormal event, and a warning sound detection means 7 which transmits an abnormality detection signal upon identifying and detecting the warning sound generated by the sensor. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a system that captures an alarm sound emitted from various abnormality detection sensors installed in a home, office, etc., and communicates to a monitoring device. It relates to the system which transmits.

  Some security systems such as ordinary homes and offices are configured to transmit to a monitoring system via communication means when an abnormality detection sensor performs a detection operation. For this transmission, a wired communication system using an analog or digital signal, or a wireless communication system using electromagnetic waves or the like is used. On the other hand, there are many sensors that generate an alarm sound and do not generate a signal, in addition to those that form the above signal.

  Among those using communication means, in the wired communication system, when the number of sensors is increased, the cable material cost and the construction cost become large, and there are problems in space utilization efficiency and aesthetics. In the wireless communication system, there is a problem that the wireless circuit is expensive in addition to the problem of interference with other wireless signals.

  On the other hand, if the sensor only emits an audible alarm, the presence of a person is a premise and sometimes it cannot be handled.

  The present invention has been made in consideration of the above-described points, and an object thereof is to provide an alarm sound transmission system that takes out an abnormality detection signal using a sensor that emits an alarm sound and transmits it to a monitoring device.

  In order to achieve the above object, the present invention provides the invention described in claims 1 to 5.

  According to the first aspect of the present invention, at least one sensor that detects the occurrence of a predetermined abnormal event and generates an alarm sound, and an abnormality detection signal when the alarm sound generated by the sensor is identified and detected. An alarm sound detecting means for transmitting is provided.

  The invention according to claim 2 is characterized in that the alarm sound detecting device in the alarm sound communication system according to claim 1 performs detection based on a frequency spectrum pattern of the alarm sound.

  The invention described in claim 3 is characterized in that the alarm sound in the alarm sound communication system according to claim 2 is detected when a predetermined sound pressure level in a plurality of predetermined frequency regions is maintained for a predetermined time.

  According to a fourth aspect of the present invention, the alarm sound detecting means in the alarm sound communication system according to the first to third aspects transmits an abnormality detection signal via a telephone network.

  The invention according to claim 5 is characterized in that the alarm sound detecting means in the alarm sound communication system according to any one of claims 1 to 4 has a function of discriminating a damaged sound of a specific material and a specific sound.

  As described above, the present invention transmits a detection signal when an abnormal sound is detected by detecting an alarm sound generated by various sensors, and thus provides an accurate remote monitoring system using a widespread sensor. can do. Moreover, there is no problem in the wired communication system and the wireless communication system, and a highly reliable system can be obtained.

  The embodiment of the present invention will be described below with reference to FIGS.

  FIG. 1 is an explanatory view conceptually showing the present invention. That is, the open / close sensor 3 is attached to the window 2 of a room in the building 1, and the open / close sensor 5 is attached to the window 4. A human sensor 6 is provided at one corner of the room.

  These sensors 3 and 5 emit an alarm sound when the window 2 or the window 4 is opened. Further, the human sensor 6 emits an alarm sound when detecting that a person has entered the room. Both of these alarm sounds are converted from an audio signal to an electric signal by the microphone 8 and given to the signal processing circuit 7.

  The signal processing circuit 7 has a function of discriminating alarm sounds generated by the open / close sensors 3 and 5 and the human sensor 8, and when these sensors generate alarm sounds, the abnormality detection signal is remotely monitored via the communication line 9. Transmit to a device (not shown).

  FIG. 2 is a block diagram showing in detail the configuration of the signal processing circuit 7 shown in FIG. The signal processing circuit 7 processes the signal given from the microphone 8 and sends it to the communication line 9. For this processing, the output of the preamplifier 71 that performs signal amplification is supplied to a processing circuit of a two-channel configuration and processed for each channel, and is then supplied to an AND circuit 77, which outputs the output to the timer circuit 78 and the remote circuit. The data is sent to the communication line 9 via the communication circuit 79.

  The 2-channel processing circuit includes band-pass filters 72A and 72B, absolute value circuits 73A and 73B, smoothing circuits 74A and 74B, comparison circuits 75A and 75B, and reference voltage circuits 76A and 76B. Then, a signal in a predetermined frequency band, for example, an audio frequency region including an audible frequency region is extracted from the audio signal supplied from the preamplifier 71 by the band pass filter 72 and supplied to the absolute value circuit 73. Since the band-pass filters 72A and 72B have different pass bands, signals of two frequency components are taken out by the filters 72A and 72B.

  The absolute value circuit 73 converts the given signal into a direct current signal to convert it into a signal having an absolute value, gives it to the smoothing circuit 74 and removes the superimposed noise, and gives it to the comparison circuit 75. The comparison circuit 75 is supplied with a reference voltage from the reference voltage circuit 76 as a reference signal corresponding to a predetermined sound pressure level, compares the output of the smoothing circuit 74 with the reference voltage, determines the magnitude, and determines the determination result as an AND circuit. Output to 77.

  If both outputs of the comparison circuits 75A and 75B are given, the logical product circuit 77 produces a logical product and produces a "1" output, and otherwise produces a "0" output. If the “1” output of the AND circuit 77 continues for a predetermined time or more set in the timer circuit 78, an output is given from the timer circuit 78 to the remote communication circuit 79, and a signal is sent to the communication line 9. Is sent out. If the signal does not continue for a predetermined time or longer, no signal is transmitted.

  3 is a frequency distribution diagram of the output of the preamplifier 71, FIG. 4 is a frequency distribution diagram of the output of the bandpass filter 72A, and FIG. 5 is a frequency distribution diagram of the output of the bandpass filter 72B.

  As shown in FIG. 3, when the open / close sensors 3 and 5 detect the opening of the window A or B and generate an alarm sound, the output of the preamplifier 71 includes a signal in a frequency band centered on the frequency fA. , And a signal in a frequency band centered on the frequency fB. From the output of the preamplifier 71, a band-pass filter 72A extracts a signal in a frequency band centered on the frequency fA as shown in FIG. If the extracted signal in the frequency band is equal to or higher than a predetermined signal intensity corresponding to a predetermined sound pressure level, the comparison is performed when the signal is given to the comparison circuit 75A via the absolute value circuit 73A and the smoothing circuit 74A. The circuit 75 A is determined to have a predetermined sound pressure level, and the result is output to the AND circuit 77.

  Similarly, as shown in FIG. 5, a signal in the frequency band centered on the frequency fB is extracted from the bandpass filter 72B, and the extracted signal in the frequency band corresponds to a predetermined signal intensity corresponding to a predetermined sound pressure level. If it is above, the judgment result which has predetermined sound pressure level is output with comparison circuit 75B.

  The logic circuit 77 satisfies the output condition of the logic circuit 77 from which the judgment result having a predetermined sound pressure level is output from both the comparison circuits 75A and 75B, operates the timer circuit 78, and connects the communication line from the remote communication circuit 79. Then, a signal is transmitted to a monitoring center (not shown).

  Thus, the alarm sound due to the opening detection of the windows 2 and 4 by the open / close sensors 3 and 5 shown in FIG. 1 and the alarm sound due to human detection by the human sensor 6 are in a specific pattern as shown in FIG. Can be detected and sent to the communication line 9.

  Since other noise generally does not have a pattern identified by the above-described signal circuit, there is usually no malfunction (false alarm) when there is no abnormality (intrusion). If the object to be collected by the microphone 8 is a room in a reinforced concrete building, sound can be propagated well, so that appropriate wireless communication can be expected regardless of the high frequency.

  Further, it is determined that the warning sound is generated when the warning sound includes the frequency fA and the frequency fB, and the sound pressure level in the frequency band centered on these two frequencies exceeds a predetermined value in the determination. Yes. Compared to the probability that a sound of one frequency is included above the predetermined sound pressure level in other noise, the probability that a sound of two frequencies is included above the predetermined sound pressure level is reduced, so the sound pressure of one frequency False alarms can be reduced as compared with the case of determination using levels.

(Other examples)
In the first embodiment, two band pass filters are used in the signal processing circuit. However, the number may be one or three or more. Further, instead of narrowing down the signal in the frequency domain, a sound pressure level fluctuation pattern may be used as the determination condition.

  In any of these cases, it is needless to say that the characteristics of the alarm sound generated by the alarm sound generating means must be matched with the determination conditions.

  On the other hand, in the above-described embodiment, the configuration in which the alarm sound detection or determination in the signal processing circuit is performed by the analog circuit is shown, but it can also be realized by a digital circuit called DSP. In that case, feature extraction using the frequency domain can be performed more flexibly, and a warning sound communication system with fewer false detections can be provided using a sensor that emits a complicated warning sound.

  In the above embodiment, the determination result is transmitted through the communication line. However, the collected sound signal, that is, the detection signal of the microphone itself is transmitted to the receiving side such as a monitoring center, and the signal processing is performed on the receiving side. It may be configured to analyze and issue an alarm.

  Furthermore, in the above embodiment, the detection contents are narrowed down by the frequency domain, but if an event with a very high signal level is targeted for detection, it is possible to detect a sound such as broken glass or a human scream as an abnormal signal. .

Explanatory drawing shown notionally of this invention. The block diagram which showed the structure of the signal processing circuit 7 shown in FIG. 1 in detail. FIG. 3 is a frequency distribution diagram illustrating two frequency components extracted by two band pass filters 72A and 72B in the circuit of FIG. 2; The frequency distribution figure which showed the example of the output signal of 72 A of band pass filters. The frequency distribution figure which showed the example of the output signal of the band pal filter 72B.

Explanation of symbols

1 building, 2, 4 windows, 3, 5 open / close sensor, 6 human sensor,
7 signal processing device, 8 microphone, 9 communication line, 71 preamplifier,
72 band pass filter, 73 absolute value circuit, 74 smoothing circuit, 75 comparison circuit, 76 reference voltage circuit, 77 AND circuit, 78 timer circuit, 79 remote communication circuit.

Claims (5)

At least one sensor that detects the occurrence of a predetermined abnormal event and generates an alarm sound; and
An alarm sound communication system comprising alarm sound detection means for transmitting an abnormality detection signal when an alarm sound generated by the sensor is identified and detected. In the alarm sound communication system according to claim 1,
The warning sound detection device is a warning sound communication system that performs detection based on a frequency spectrum pattern of the warning sound. The alarm sound communication system according to claim 2,
A warning sound communication system that detects when the warning sound has maintained a predetermined sound pressure level in a plurality of predetermined frequency regions for a predetermined time. In the alarm sound communication system according to any one of claims 1 to 3,
The alarm sound detection means is an alarm sound communication system for transmitting an abnormality detection signal via a telephone network. In the alarm sound communication system according to any one of claims 1 to 4,
The alarm sound detection means is an alarm sound communication system having a function of identifying a damaged sound of a specific material and a specific sound.

Images