1, manual telephone alarm
It is through the reporter to dial the phone, using the telephone exchange network to achieve oral voice alarm, such as 110 alarm, alarm system.
The manual telephone alarm can be done quickly and in a timely manner, but it cannot solve the problem of preventing automatic alarm when the site is unattended.
2, automatic alarm of electronic equipment
When the automatic alarm of electronic equipment is detected by a variety of detectors installed on the user's premises to prevent various abnormal conditions (such as illegal intrusion, theft, destruction, fire, etc.), the detector automatically reports to the alarm controller (or The alarm control/communications host) sends an alarm message, and the alarm controller automatically dials the phone of the alarm center and reports the alarm to the alarm center.
According to the way the alarm signal is transmitted in the telephone line, the method can be divided into two types: the recording voice signal automatic alarm and the digital signal telephone automatic alarm.
1 recording voice signal telephone automatic alarm
In this case, the alarm signal is a recorded voice alarm signal that a previously recorded person or a simulated person speaks into the telephone line and transmits to the alarm receiving center.
The information transmitted by the recording voice signal alarm and the artificial voice signal alarm in the telephone line is the same and all are the people's voice analog signals, except that the former is an automatic alarm and the latter is an artificial alarm. The advantage of recording voice information alarms is that it can be used to make unattended automatic alarms. The equipment is relatively simple and the price is relatively low. The disadvantage is that when there are different types of detectors at the scene of the prevention, the reported situation cannot distinguish between the categories of the police (such as theft, robbery, and fire), and it is not clear which defense area (ie, the specific scene of the police situation). In addition, whether it is a recording voice signal alarm or an artificial voice signal alarm, the common disadvantages are: the speed of voice analog signal transmission is slow, and the amount of information transmitted per unit time is less. Coupled with longer voice alarm information, sometimes it will inevitably have a certain degree of ambiguity (characteristically when the alarm person is extremely nervous), and at the same time when the alarm is still often depends on the telephone listener's reaction, quality, etc., easily mistakenly received And missed. In addition, there are disadvantages such as difficulty in recording, statistics, classification, filing, and other inconvenient post-management of voice alarm content.
2 digital signal telephone automatic alarm
In this method, the alarm information is transmitted in the telephone line as a digital signal, which is not only fast and accurate, but also has a large amount of information transmitted in a unit time, high efficiency, and is convenient for rapid processing by the alarm center. At the same time also has the advantages of alarm data for easy storage, classification, archiving, query, statistics and other convenient.
Although the digital signal telephone automatic alarm system has a variety of networking modes, it is basically an alarm detector, an alarm controller (or alarm control/communication host), a public switched telephone network or a group telephone switching network, and a police officer. The center's alarm receiver, alarm processor and other ancillary equipment (such as map board display, printers and other equipment) are composed of four parts.
The basic working principle of the digital signal telephone automatic alarm system is: on the user's side to prevent the scene, once an emergency such as intrusion, robbery or fire, the corresponding alarm detector (various anti-theft, anti-intrusion, fire detectors and Manual alarm buttons, etc.) immediately send an alarm signal to the alarm control/communications host.
The alarm control/communication host receiver will immediately send an audible and visual alarm immediately after this signal, and display the alarm location and alarm condition to remind the on-duty personnel of the user to perform the processing. At the same time, the alarm control/communications host immediately dials automatically through the telephone line to send a digital alarm signal to the receiving alarm center (some may also send a replay monitoring signal). From the digital alarm receiver or computer screen of the alarm center, the alarm category (theft, robbery, fire alarm, emergency ambulance, etc.) can be accurately displayed, and the unit, address, telephone number, contact person and alarm of the alarm can also be displayed. Send out information such as the unit, and display the location of the alarm on the electronic map board, print out the relevant information of the alarm, and use the recorder to record the sound of the scene.
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