Automatic alarm device for non-ring-off

Abstract

The invention discloses an automatic alarm device for non-ring-off, comprising a telephone line access inlet, a telephone line outlet, a busy tone alarming module and a power supply, wherein the telephone line access inlet is connected with the telephone line outlet, the telephone line access inlet is connected with a telephone outside line, the telephone line outlet is connected with a telephone set by the telephone line, the input end of the busy tone alarming module is connected between the telephone line access inlet and the telephone line outlet, the busy tone alarming module is connected with the power supply. When the ring-off of the telephone set fails or a receiver drops, the telephone set is in the off-hook state for a long time, outside line can not enter, while the master do not know that, the invention can automatically alarm and remind the people of ringing off. The invention has simple structure, convenient use and lower cost, and can be matched with any of telephone set, the original telephone set can not be changed when in use; a single power supply, a single loudspeaker and a multiple-color light emitting diode combination are used, the alarming way is diversified and the alarming effect is good.

Description

technical field [0001] The invention relates to a communication device, in particular to an automatic alarm device for a phone not on-hook. Background technique [0002] At present, almost every household has a telephone, and the telephone is also an indispensable communication tool in people's daily life. The current telephone is generally hung on the phone with the handset, because of various reasons, such as the handset falling off after hanging up, the handset slipping out after being touched by children or animals, etc., often cause the phone to be in the off-hook state for a long time, and the outside line cannot Intrusion, but the host does not know, resulting in communication can not be carried out normally. The document of Chinese Utility Model Patent Application No. 94208539.6 discloses a telephone busy tone monitoring alarm and reset device, which provides an automatic on-hook and reset function, accompanied by a ringtone alarm. We can know through analysis that...

AI Technical Summary

Problems solved by technology

[0003] 1. If people have already left the scene and cannot hear the alarm signal, but fail to let people know that the phone is not on-hook, the automatic hang-up function is of little significance

[0004] 2. Whenever people come back to the scene after the automatic hang-up, when the call comes in, people have to press the reset button first, and then they can answer normally, which is inconvenient to use

[0005] 3. The structure is too complicated and the production cost is high

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