Interface circuit of voice recorder

Abstract

The invention discloses an interface circuit of a voice recorder. The interface circuit is characterized by comprising a socket, a horn, a double-controlled switch K, a bridge type rectifier diode D,a voltage-regulator diode D1, resistors R2, R3, R4, and R5, capacitors C1, C2, C3, and C4, and triodes T1 and T2. A port 1 of the socket is connected with a port 1 of the bridge type rectifier diode D; a port 2 of the socket is connected with a port 3 of the bridge type rectifier diode D; a port 2 of the bridge type rectifier diode D is connected in series with the capacitor C2 and a fixed terminal C of the double-controlled switch K successively; a port 4 of the bridge type rectifier diode D is connected in series with the resistor R3, an emitter of the triode T1,a collector of the triode T1,a collector of the triode T2, an emitter of the triode T2, and the resistor R2 successively; and the resistor R2 is also connected with a port 2 of the bridge type rectifier diode D. A moving terminal a of the bridge type rectifier diode D is connected with an IO port 1 of the horn; a fixed terminal b of the double-controlled switch K is connected with an IO port 1 of the horn; and an IO port 2 of the horn is connected with the capacitor C1. On the basis of the principle, the circuit has advantages of high reliability and low price and can be used as an interface circuit of an automatic phoneinquiring or dialing control system; and the usage is flexible.

Description

Technical field [0001] The invention relates to an interface circuit, in particular to an interface circuit of a voice recorder. Background technique [0002] With the development of digital signal processing chip (DSP), voice codec technology is increasingly widely used in military, civilian and surveillance fields. As far as the voice digital recorder is concerned, it can also be widely used in many fields such as transportation, public security, fire protection, telephone service quality supervision and so on. However, the recorder is usually placed near the work site. If you want to know the working status of the recorder or query the recorded data in it, the maintenance personnel must go to the site, which is a huge workload. The recorder can provide a remote telephone query interface, and maintenance personnel can query the working status and data records of the recorder by relying on the phone in hand. The system needs to monopolize a phone number. After the call is conn...

AI Technical Summary

Problems solved by technology

Among them, a highly reliable, flexible and convenient interface circuit is required, but the existing circuit cannot meet the needs

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