CN203574729U

CN203574729U - Teleconference coupler

Info

Publication number: CN203574729U
Application number: CN201320718785.7U
Authority: CN
Inventors: 杨辛林
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-11-13
Filing date: 2013-11-13
Publication date: 2014-04-30
Anticipated expiration: 2023-11-13

Abstract

The utility model discloses a teleconference coupler, comprising a balanced input circuit, a balanced output circuit, a sidetone elimination isolating circuit, an on/off-hook detection circuit, a polarity conversion circuit and a mute control circuit, wherein speech signals are output by a sound mixing console, a power amplifier or a sound box after passing through the balanced input circuit, the sidetone elimination isolating circuit, the polarity conversion circuit, the on/off-hook detection circuit, the mute control circuit and the balanced output circuit in sequence. The teleconference coupler adopts the balanced input circuit and the balanced output circuit, can effectively suppress noise, and can be better matched with other professional audio equipment; good telephone sound quality can be obtained by adopting the sidetone elimination isolating circuit, the harmful acoustic feedback can be avoided, the telephone circuit is isolated from the audio circuit, and the sidetone elimination effect is good; the teleconference coupler facilitates the operation of the workers by adopting the on/off-hook detection circuit, when a parallel port telephone is off-hooked, the audio outputs automatically, and when the telephone is on-hooked, the audio stops output automatically, thereby improving the working efficiency.

Description

A kind of videoconference coupler

Technical field

The utility model relates to videoconference coupler field, the videoconference coupler that especially a kind of telephone sound quality is effective.

Background technology

Videoconference coupler is mainly used in holding videoconference, is particularly suitable for medium-sized and small enterprises, alarm center, training organization, guarantee corporation, logistics company etc. and holds videoconference and use, and can allow people obtain the experience as on the spot in person.Can, for you strengthen cooperation, increase work efficiency, strengthen flexibility, shorten the decision-making time, reduce costs.Although videoconference coupler performance in the market can meet people's the still some shortcomings of its existence of requirement: input and output have certain noise; Can not mate with other equipment well; Have harmful acoustic feedback, telephone sound quality is good not; Its auto-pickup is hung up function automatically, and while just squeezing into according to phone, the pulse of the tinkle of bells is connected, and hangs up, and just cannot automatically connect inefficiency while getting according to blind sound.

Utility model content

The purpose of this utility model is the defect that overcomes above-mentioned prior art, provides a kind of noise little, and audio frequency output, the videoconference coupler that operating efficiency is high are squeezed into, got to the good and phone of tonequality.

The implementation of the technical program is: a kind of videoconference coupler, comprising:

Balance input circuit, for passing through microphone, sound console or mixing source of sound input speech signal;

Balanced output circuit, for exporting voice signal by sound console, power amplifier or audio amplifier;

Eliminate sidetone buffer circuit, for eliminating sidetone and the isolation of telephone audio signal being changed;

Picking/hanging machine detection circuit, for detection of phone off-hook and hook state, and during off-hook, audio frequency is exported automatically, and during on-hook, audio frequency just stops output automatically;

Polarity switching, for anti-phase, positive polarity conversion;

Muting control circuit, for controlling the output of audio signal;

Described voice signal is successively by being exported by sound console, power amplifier or audio amplifier after described balance input circuit, elimination sidetone buffer circuit, polarity switching, picking/hanging machine detection circuit, muting control circuit and balanced output circuit.

Further, between described picking/hanging machine detection circuit and muting control circuit, be connected with meeting, warning and scheduling emergency circuit.

Further, between described balance input circuit and elimination sidetone buffer circuit, be connected with Hybrid amplifier circuit.

Particularly, described balance input circuit comprises microphone balance input circuit and line balance input circuit, and described microphone balance input circuit and line balance input circuit are connected in described Hybrid amplifier circuit side by side.

Further, between described elimination sidetone buffer circuit and muting control circuit, be connected with preamplifying circuit.

Further, described polarity switching is also connected with phone holding circuit.

Particularly, described phone holding circuit is linked in described muting control circuit by connecting control circuit.

Further, described polarity switching is connected with phone external interface and parallel-port electrical phone interface circuit again.

Further, described polarity switching is connected with call reminding circuit.

The utility model has the advantages that: 1. adopt balance input circuit and balanced output circuit, can effectively suppress noise, and can mate with other professional audio equipment better; 2. adopt elimination sidetone buffer circuit can obtain good telephone sound quality, avoid harmful acoustic feedback, and by telephone circuit and voicefrequency circuit isolation, avoid the interference of telephone circuit to voicefrequency circuit, avoid sealing in other noise simultaneously, there is good anti-sidetone effect; 3. adopt picking/hanging machine detection circuit to facilitate staff to work better more easily, when parallel-port electrical receiver off-book, audio frequency is exported automatically, and when the on-hook of parallel-port electrical phone, audio frequency just stops output automatically, has improved operating efficiency.

Accompanying drawing explanation

Fig. 1 is the theory diagram of a kind of videoconference coupler of the utility model;

Fig. 2 is the microphone balance input circuit schematic diagram of a kind of videoconference coupler of the utility model;

Fig. 3 is the Hybrid amplifier circuit diagram of a kind of videoconference coupler of the utility model;

Fig. 4 is the line balance input circuit schematic diagram of a kind of videoconference coupler of the utility model;

Fig. 5 is that the circuit of a kind of videoconference coupler of the utility model is eliminated sidetone buffer circuit schematic diagram;

Fig. 6 is the polarity switching schematic diagram of a kind of videoconference coupler of the utility model;

Fig. 7 is the picking/hanging machine detection circuit schematic diagram of a kind of videoconference coupler of the utility model;

Fig. 8 is the incoming call indicating circuit schematic diagram of a kind of videoconference coupler of the utility model;

Fig. 9 is the preamplifying circuit of a kind of videoconference coupler of the utility model;

Figure 10 is the phone holding circuit of a kind of videoconference coupler of the utility model;

Figure 11 is the electric control circuit that comes of a kind of videoconference coupler of the utility model;

Figure 12 is the outside line interface utmost point parallel port telephone interface circuit of a kind of videoconference coupler of the utility model;

Figure 13 is the muting control circuit of a kind of videoconference coupler of the utility model;

Figure 14 is the line balance output circuit of a kind of videoconference coupler of the utility model.

Embodiment

Below in conjunction with accompanying drawing, concrete case study on implementation of the present utility model is illustrated:

As shown in Figure 1, a kind of videoconference coupler, comprises balance input circuit, and balanced output circuit is eliminated sidetone buffer circuit, picking/hanging machine detection circuit, polarity switching and muting control circuit.Wherein, described balance input circuit, for passing through microphone, sound console or mixing source of sound input speech signal; Balanced output circuit, for exporting voice signal by sound console, power amplifier or audio amplifier; Eliminate sidetone buffer circuit, for eliminating sidetone and the isolation of telephone audio signal being changed; Picking/hanging machine detection circuit, for detection of phone off-hook and hook state, and during off-hook, audio frequency is exported automatically, and during on-hook, audio frequency just stops output automatically; Polarity switching, for anti-phase, positive polarity conversion; Muting control circuit, for controlling the output of audio signal.Described voice signal is successively by being exported by sound console, power amplifier or audio amplifier after described balance input circuit, elimination sidetone buffer circuit, polarity switching, picking/hanging machine detection circuit, muting control circuit and balanced output circuit.

In addition, between described picking/hanging machine detection circuit and muting control circuit, be connected with meeting, warning and scheduling emergency circuit.Between described balance input circuit and elimination sidetone buffer circuit, be connected with Hybrid amplifier circuit, the signal in described balance input circuit enters into elimination sidetone buffer circuit again and processes after Hybrid amplifier circuit amplifies.Described balance input circuit comprises microphone balance input circuit and line balance input circuit, described microphone balance input circuit is by microphone input signal, by sound console, (sound console claims again tuning control desk to described line balance input circuit, it amplifies multichannel input signal, mix, distribute, tonequality is modified and acoustics processing, it is modern station broadcast, stage amplify and the system such as sound equipment program making in broadcasts and the visual plant of program recording) and mixing source of sound input signal, and described microphone balance input circuit and line balance input circuit are connected in described Hybrid amplifier circuit side by side.Between described flat elimination sidetone buffer circuit and muting control circuit, be connected with again preamplifying circuit, described elimination sidetone buffer circuit circuit signal after treatment is input in described muting control circuit after described preamplifying circuit again.

Described polarity switching is also connected with phone holding circuit, and described phone holding circuit is linked in described muting control circuit by connecting control circuit.Described polarity switching is connected with phone external circuits again, and described phone external circuits connects parallel-port electrical phone.Described polarity switching is connected with call reminding circuit.

Fig. 2-Figure 14 is the physical circuit figure of each circuit.

Wherein, Fig. 2 is microphone balance input circuit figure, in described microphone balance input circuit, be connected into a MIC2, two input terminals of described MIC2 divide two-way to connect respectively electrochemical capacitor E6, resistance R 72 and electrochemical capacitor E8, resistance R 73 is linked in operational amplifier IC12B.

Fig. 3 is Hybrid amplifier circuit, and described Hybrid amplifier circuit comprises two operational amplifier IC13B and IC13A.

Fig. 4 is line balance input circuit, a LINEIN2 of described line balance input circuit access, two input terminals of described LINE IN2 divide two-way to connect respectively electrochemical capacitor E19, resistance R 80 and electrochemical capacitor E20, resistance R 81 is linked in operational amplifier IC12A.

Fig. 5 is for eliminating sidetone buffer circuit, and described elimination sidetone buffer circuit mainly comprises two transformer T3 and T4.

Fig. 6 is polarity switching, and described polarity switching mainly comprises two integrated circuit (IC) 17 and IC4.

Fig. 7 is picking/hanging machine detection circuit, and described picking/hanging machine detection circuit mainly comprises two triode Q10 of chain and Q7.

Fig. 8 is incoming call indicating circuit, and described incoming call indicating circuit comprises electrochemical capacitor E35, resistance R 74 and light-emitting diode L4.

Fig. 9 is preamplifying circuit, operational amplifier IC15A and the IC15B of two series connection of described preamplifying circuit.

Figure 10 is phone holding circuit, and described phone holding circuit comprises resistance R 5, triode Q8 and diode D4.

Figure 11 is for connecting control circuit, and described connection control circuit mainly comprises electrochemical capacitor E25, resistance R 54 and single-pole double-throw switch (SPDT) SW2.

Figure 12 is phone external interface and parallel port telephone interface circuit, and described phone external interface and parallel port telephone interface circuit mainly comprise that double-pole multithrow switch JD3, TEL LINE (telephone line) J3 and TEL SET(phone arrange) J4.

Figure 13 is muting control circuit, and described muting control circuit mainly comprises three triode Q12, Q11 and Q9.

Figure 14 is line balance output circuit, described line balance output circuit has access to LINEOUT2, one, two interfaces of described LINE OUT2 are connected with operational amplifier IC14A with R65 by electrochemical capacitor E2, and another interface is connected with operational amplifier IC14B with R66 by electrochemical capacitor E5.

In described off-hook detection circuit when parallel port phone has off-hook, voltage on telephone wire is 24V or 15V from some telephone set of 45V(at once) be down to about 5V, voltage on described this telephone wire of off-hook detection electric circuit inspection: during off-hook, when voltage is reduced to 5v left and right, Q7 collector electrode becomes high level, Q10 penetrates collection and becomes high level output, by R85, and the muting control circuit output audio signal that the control of IC11 optocoupler output high level is comprised of Q9, Q11 and Q12; During on-hook, when voltage is upgraded to 48V left and right, Q7 collector electrode becomes low level, and Q10 emitter-base bandgap grading becomes low level output, and by R85, IC11 optocoupler output low level cannot be got through the muting control circuit being comprised of Q9, Q11 and Q12, therefore now there is no audio signal output.In described elimination sidetone buffer circuit, utilized transformer phase cancellation, regulate P5 and C31 value to reach best anti-sidetone effect, meanwhile, can be by telephone audio signal isolation conversion in described elimination sidetone buffer circuit.

The utility model, according to Principle of Communication, becomes the two-wire system of telephone wire into four-wire system, the bi-directional speech signal of telephone communication is divided into input, output, so that the intercommunication between two control desks.Utilize telephone wire to do intercommunication signal transmission, saved the trouble on another stringing road, and can, by it as phone spot coverage, videoconference, phone scheduling, can complete two/tetra-lines conversions, phone is got and the function such as phone access.Input, output employing standard CANNON socket, be conducive to and the docking of other equipment.

This equipment is mainly for telephone interview, phone scheduling, videoconference, phone are received a crime report and designed.Wherein, described balance input circuit, balanced output circuit can suppress noise effectively, mate better with other professional audio equipment; Sidetone buffer circuit is eliminated in described employing can obtain good telephone sound quality, avoid harmful acoustic feedback, and by telephone circuit and voicefrequency circuit isolation, avoid the interference of telephone circuit to voicefrequency circuit, avoid sealing in other noise simultaneously, thereby reach best anti-sidetone effect; Adopt picking/hanging machine detection circuit to facilitate staff to work better more easily, as long as parallel-port electrical phone one off-hook, audio frequency is exported automatically, on-hook, and audio frequency just stops output automatically, has greatly improved operating efficiency.Auto-pickup on market is hung up automatically, just judges that when phone is squeezed into, the pulse of the tinkle of bells is connected, and judges that blind sound hangs up, and while getting, just cannot automatically connect; The better head it off of this equipment, audio frequency output is squeezed into, got to phone.

As described above, it is only preferred embodiment of the present utility model, when not limiting the scope that the utility model is implemented with this, the simple equivalence of generally doing according to the utility model claim and utility model description changes and modifies, and all still belongs in the scope that the utility model patent contains.

Claims

1. a videoconference coupler, is characterized in that, comprising:

Polarity switching, for anti-phase, positive polarity conversion;

Muting control circuit, for controlling the output of audio signal;

2. a kind of videoconference coupler as claimed in claim 1, is characterized in that, is connected with meeting, warning and scheduling emergency circuit between described picking/hanging machine detection circuit and muting control circuit.

3. a kind of videoconference coupler as claimed in claim 1, is characterized in that, between described balance input circuit and elimination sidetone buffer circuit, is connected with Hybrid amplifier circuit.

4. a kind of videoconference coupler as claimed in claim 1, it is characterized in that, described balance input circuit comprises microphone balance input circuit and line balance input circuit, and described microphone balance input circuit and line balance input circuit are connected in described Hybrid amplifier circuit side by side.

5. a kind of videoconference coupler as claimed in claim 1, is characterized in that, between described elimination sidetone buffer circuit and muting control circuit, is connected with preamplifying circuit.

6. a kind of videoconference coupler as claimed in claim 1, is characterized in that, described polarity switching is also connected with phone holding circuit.

7. a kind of videoconference coupler as claimed in claim 6, is characterized in that, described phone holding circuit is linked in described muting control circuit by connecting control circuit.

8. a kind of videoconference coupler as claimed in claim 1, is characterized in that, described polarity switching is connected with phone external interface and parallel-port electrical phone interface circuit again.

9. a kind of videoconference coupler as claimed in claim 1, is characterized in that, described polarity switching is connected with call reminding circuit.