Telephone incoming call prompt automatic switching method and telephone set
A technology for prompting incoming calls and automatic switching, applied in telephone communication, devices called number recording/indicating calling party numbers, electrical components, etc., can solve the problems of affecting other people's normal work and missing calls, and achieve humanization, The effect of reducing leakage and simple structure
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Embodiment 1
[0027] Embodiment 1, a telephone set with the function of automatically switching the notification mode of an incoming call, including a ring signal detection circuit as shown in FIG. 2 and an infrared detector circuit as shown in FIG. 3 .
[0028] When the user is called, the telephone exchange sends a ringing signal, wherein the ringing is a sine wave of 25±3Hz, the distortion of the harmonic ring is not more than 10%, and the effective value of the voltage is 90±15V. According to the relatively high voltage of the ringing signal, the ringing signal detection circuit shown in Figure 2 is connected in parallel on the telephone line, that is, the ab terminal is connected to the telephone line in parallel. The a terminal is connected to the b terminal through the filter capacitor C02 and the Zener diode D01 connected in parallel on the one hand through the DC blocking capacitor connected in series; The cathode is connected to terminal B. The emitter of the phototransistor in t...
Embodiment 2
[0038] Embodiment 2, in this embodiment, the ringing signal detection circuit and the human body signal detection device are arranged outside the telephone to form an independent detection device, and then the detection device is connected to the telephone line, which can also assist the present invention. Some telephone sets realize the automatic conversion function of the incoming call prompt mode. Wherein, the ringing signal detection circuit in the detection device can refer to the circuit structure shown in Figure 2, and can also be realized by using other various circuit structures, the present embodiment is not limited thereto; and the human body signal detection device can also adopt The infrared detection circuit shown in 3 is realized, or other existing human body detection devices, etc., which are not specifically limited in this embodiment.
[0039] In this way, when the detection device detects that there is a ringing signal input, it starts the power-on operation...
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