CN2147694Y - Wire electronic interspeaking device - Google Patents

Abstract

The utility model discloses an improved electronic intercom with two wires. The structure of the utility model comprises a main machine, an accessory machine and a transmission line, wherein, both the main machine and the accessory machine comprise casings and circuits. The circuit comprises a pickup, a resistor, a capacitor, an amplifying circuit, a horn, a power supply, a ringing circuit, a switch and an anti-sidetone circuit. The utility model is characterized in that the anti-sidetone circuit is composed of a transistor, the resistor, the capacitor and an adjustable resistor; the fixed end of the adjustable resistor is respectively connected with a collecting electrode and an emitting electrode of the transistor; the adjustable end of the adjustable resistor is connected with the amplifying circuit, and a positive transmission line is connected between the transistor and the adjustable resistor. Compared with the existing intercom of same type, the utility model has the advantages of no sidetone interference, simple structure, low fabrication cost, etc.

Description

Wire electronic interspeaking device

The utility model belongs to a kind of wired communication device, particularly a kind of two wires transmission that has ringer function and have pick-up, loudspeaker to advancing machine.Can be used as entryphone, short distance intercom, playphone etc.

Intercom is transmitted at present existing similar two wires, and can be divided into has anti-sidetone and do not have two kinds of versions of anti-sidetone, does not have anti-sidetone intercom, relatively simple for structure, but the words of oneself saying are sounded from own loudspeaker simultaneously, form a kind of noise jamming, so speech transmissions is of poor quality; Anti-sidetone intercom is arranged, and the words of oneself saying can not sounded from own loudspeaker, and its speech transmissions quality is good, but structure all more complicated, cost are higher.

The purpose of this utility model provides a kind of two wires hand free interphone machine with improved anti-sidetone structure, and it is simple in structure, cost is lower.

Below in conjunction with accompanying drawing the technical solution of the utility model is described.

Fig. 1 is the circuit diagram of a kind of scheme of the utility model.

Fig. 2 is the circuit diagram of the another kind of scheme of the utility model.

Fig. 1 and Fig. 2 have omitted the main frame of housing parts or the circuit part on the secondary machine.

With reference to Fig. 1, a kind of wired electronic intercommunication machine, comprise main frame, slave and with two transmission lines of its binding, main frame and slave have included housing parts and circuit part, this circuit part includes sound pick-up MIC₁, resistance R₁, capacitor C₁～C ₃, LM386 type integrated amplifier IC₁, loudspeaker SP₁, power supply E₁, by FG04 type integrated oscillator IC₂, triode BG₂, resistance R₆The ringing circuit, the change-over switch K that consist of₁, button switch K₂, anti-side-tone circuit, it is characterized in that described anti-side-tone circuit is by triode BG₁, resistance R₂～R ₄, capacitor C₄～C ₅With adjustable resistance R₅Consist of triode BG₁Base stage and sound pick-up MIC₁Signal output part connect, branch road of its colelctor electrode and a branch road of emitter stage pass through respectively capacitor C₄And C₅With adjustable resistance R₅Two stiff ends connect adjustable resistance R₅Adjustable end and amplifier IC₁Signal input part connect, anodal transmission line is by change-over switch K₁Triode BG with anti-side-tone circuit₁Colelctor electrode is to adjustable resistance R₅Circuit between the stiff end links.

With reference to Fig. 2, a kind of wired electronic intercommunication machine, comprise main frame, slave and with two transmission lines of its binding, main frame and slave have included housing parts and circuit part, this circuit part includes sound pick-up MIC₂, resistance R₇, capacitor C₆、C ₉And C₁₂, by triode BG₄And BG₅, resistance R₁₂～R ₁₅, capacitor C₁₀The second amplifying circuit, the loudspeaker SP that consist of₂, power supply E₂, by FG04 type integrated oscillator IC₃, resistance R₁₆, capacitor C₁₁, diode D₁The ringing circuit, the change-over switch K that consist of₃, button switch K₄, anti-side-tone circuit, it is characterized in that described anti-side-tone circuit is by triode BG₃, resistance R₈～R ₁₀, capacitor C₇And C₈, adjustable resistance R₁₁Consist of triode BG₃Substrate and sound pick-up MIC₂Signal output part connect, branch road of its colelctor electrode and a branch road of emitter stage pass through respectively capacitor C₇And C₈With adjustable resistance R₁₁Two stiff ends connect adjustable resistance R₁₁Adjustable end be connected with the signal input part of second amplifying circuit, anodal transmission line is by change-over switch K₃Triode BG with anti-side-tone circuit₃Colelctor electrode is to adjustable resistance R₁₁Circuit between the stiff end links.

The structure of above-mentioned two kinds of schemes all is that major and minor machine is got illustrated same circuits and connected into symmetrical structure, and its anti-sidetone principle is (as BG by a triode ₁) collector and emitter connect an adjustable resistance respectively (as R ₅) two stiff ends, the adjustable termination amplifying circuit of adjustable resistance, anodal transmission line is connected between transistor collector and the adjustable resistance stiff end, the base stage of triode connects the pickup circuit, like this, can make the audio signal of this machine be output as zero by adjusting adjustable resistance from the adjustable end of adjustable resistance, be that local signal can not imported local amplifier, the signal of this machine then can transfer to the other side's machine by the anodal transmission line that joins with collector electrode, the signal of the other side's machine also can be imported this machine amplifying circuit through this machine adjustable resistance by anodal transmission line, thereby reaches anti-sidetone purpose.The technical conceive of this scheme is an advantages of simple, compares with similar hand free interphone machine, and it has advantages such as the speech transmissions quality is good, simple in structure, cost is low.

Below the behaviour in service of Fig. 1 is described:

The major and minor machine circuit of this intercom is all as Fig. 1, and it is complete symmetrical structure that the major-minor machine is linked by positive and negative two transmission lines.When both sides do not carry machine, K ₁All be in the b position, complete machine is an off position.When we carry machine, our K ₁Promptly be changed to a position, press our K ₂The time, anodal transmission line and negative pole short circuit, the IC of the other side's machine ₂8 ends obtain the BG that zero input signal, its 2 end are promptly exported bell signal, signal bits the other side ₂Amplify the SP of back by the other side ₁Send ringing tone.The other side carries machine after hearing ring, the other side K ₁Also be in a position, at this moment both sides can converse.We's speech transmissions path is by our MIC ₁Pickup is transformed to audio signal, the signal C through we ₁, BG ₁, C ₄, K _1-2A position, anodal transmission line, again through the other side's K _1-2A position, R ₅, C ₂, IC ₁, C ₃To the other side SP ₁Send speech.The other side's speech transmissions path and ring path and roughly the same above-mentioned.

Below the behaviour in service of Fig. 2 is described:

The major and minor machine circuit of this intercom is all as Fig. 2, and it is complete symmetrical structure that the major-minor machine is linked by positive and negative two transmission lines.When both sides do not carry machine, K ₃All be in the d position, complete machine is an off position.When we carry machine, our K ₃Promptly be converted to the C position, press our K ₄The time, anodal transmission line and negative pole short circuit, the IC of the other side's machine ₃8 ends obtain zero input signal, its 2 end and promptly export bell signal, signal D through the other side ₁And C ₁₁Circuit is again through the other side BG ₅Amplify, by the other side SP ₂Send ringing tone.The other side carries machine after hearing ring, the other side K ₃Also be in the C position, at this moment both sides can converse.We's speech transmissions path is the MIC by we ₂Pickup is converted to audio signal, signal through our C ₆, BG ₃, C ₇, K _3-2C position, anodal transmission line, again through the other side's K _3-2C position, R ₁₁, C ₉, BG ₄, C ₁₀, BG ₅, by the other side SP ₂Send speech.The other side's speech transmissions path and ring path and roughly the same above-mentioned.

Claims (1)

1. A kind of wired hand free interphone machine, comprise main frame, secondary machine and with two transmission lines of its binding, main frame and secondary machine have included housing parts and circuit part, this circuit part includes pick-up, resistance, electric capacity, amplifying circuit, loudspeaker, power supply, by FG04 type integrated oscillator, triode, the ringing circuit that resistance constitutes, change over switch, push-button switch, anti-side-tone circuit, it is characterized in that described anti-side-tone circuit is by triode, resistance, electric capacity and adjustable resistance constitute, and the base stage of triode is connected with the signal output part of pick-up, a branch road of its collector electrode and a branch road of emitter are connected with two stiff ends of adjustable resistance by electric capacity respectively, the adjustable end of adjustable resistance is connected with the signal input part of amplifying circuit, and anodal transmission line links by transistor collector to the circuit between the adjustable resistance stiff end of change over switch and anti-side-tone circuit.

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