CN2318771Y - Wire duplex loud-speaker intercome telephone switchboard - Google Patents
Wire duplex loud-speaker intercome telephone switchboard Download PDFInfo
- Publication number
- CN2318771Y CN2318771Y CN 97224824 CN97224824U CN2318771Y CN 2318771 Y CN2318771 Y CN 2318771Y CN 97224824 CN97224824 CN 97224824 CN 97224824 U CN97224824 U CN 97224824U CN 2318771 Y CN2318771 Y CN 2318771Y
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- circuit
- send
- words
- amplifier
- talked
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Abstract
The utility model relates to a wired duplex loud-speaker intercom telephone switchboard, provided with an antijamming thick film circuit which is controlled by a transmitting-receiving state control switch circuit. The switch circuit is a sound control thick film circuit cascaded by a negative-feedback logarithm detection amplifier which is connected with the input port of a transmitting preamplifier and is bridged with a transmitting locking circuit, a voltage doubling rectifying circuit, an electronic switch whose input port is connected in series with a clamping voltage stabilizing diode and a two-stage inverter. The utility model has the advantages of novel design, practicality and reliability, free talk, complete syllable and strong antijamming ability and uses the duplex talk mode. The wired duplex loud-speaker intercom telephone switchboard is especially suitable for the telephone switchboards for the railway telegraphing signal maintenance in railway stations or electrification sectors which have the disadvantages of big line jamming and big ambient noise.
Description
The utility model relates to the telephone communication set that comprises voice amplifier, relates in particular to a kind of wired duplex intercommunication telephone exchange that amplifies.
Exist serious supply harmonic interference and frequency-shift signaling interference and communication environment also to have the occasion of serious noise jamming at communication line, when for example adopting phone contact maintenance station field electric equipment between rail yard and station or the signal box, existing telephone communication set speech quality is too poor, often hear overcast, stiff beeping sound, when pulling in, also can hear frequency-shift signaling back drops such as 650,750 or 850 hertz, thereby seriously influence speech quality.
The purpose of this utility model is to remedy the deficiencies in the prior art, proposes a kind of wired duplex intercommunication telephone exchange that amplifies.
The purpose of this utility model is achieved by the following technical programs.
This wired duplex intercommunication telephone exchange that amplifies, by insert two ends be parallel with the microphone of normally closed push button switch handset transmitter, send the words preamplifier, send the words power amplifier, send and be subjected to speech phase control switch circuit, talked about amplifier and stabilized voltage power supply is formed, it is characterized in that:
At talk line and talked about and be provided with one between the amplifier and be controlled by and send the anti-interference thick film circuit that is subjected to speech phase control switch circuit, the coupling circuit that it is connected to talk line by the input output of connecting is connected to and is talked about amplifier and cross-over connection is formed by an electronic switch of being talked about locking circuit of speech phase control switch circuit by being controlled by to send, and this electronic switch also is controlled by a end span that input is connected to talk line and is connected to be controlled by and send another that be subjected to speech phase control switch circuit to be talked about the negative feedback logarithm detecting amplifier of locking circuit and the circuit of voltage doubling rectifing circuit cascade;
Above-mentionedly send that to be subjected to speech phase control switch circuit be one to have and send negative feedback logarithm detecting amplifier, voltage doubling rectifing circuit, the input of words locking circuit to be serially connected with the sound control thick film circuit that the electronic switch of clamp voltage stabilizing didoe becomes with two-stage inverter stage joint group by being connected to the input cross-over connection of sending the words preamplifier, the output of its prime inverter is connected to the control end of anti-interference thick film circuit, and the output of back level inverter is connected to the electronic switch that the control locking send words power amplifier input.
Further feature of the present utility model is, send formed by the voltage doubling rectifing circuit and an electronic switch cascade of band T type resistance attenuator by the words locking circuit that send of speech phase control switch circuit, and another input that is not connected to the negative feedback logarithm detecting amplifier that send the words locking circuit is circumscribed with adjustable resistance.
The utility model modern design, practical reliable, adopt duplexing talking mode, can eliminate single worker incident leakage words drawback when conversing, conversation freely, syllable is complete, and has very strong antijamming capability, can suppress to set 150 millivolts enter with interfering signal and to be subjected to the talking path, are particularly suitable for disturbing big, that environmental noise is also big railway station or electrified section to make railway electrical signal maintenance telephone exchange at circuit, also can be widely used between each workshop of factory or each section office of office and make the talk-back exchange.
The utility model has the following drawings:
Fig. 1 is circuit theory diagrams of the present utility model;
Fig. 2 is a sound control thick film circuit schematic diagram of the present utility model;
Fig. 3 is an anti-interference thick film circuit schematic diagram of the present utility model.
Below in conjunction with embodiment and contrast accompanying drawing the utility model is made an explanation.
Wired duplex of embodiment expands end intercommunication telephone exchange can connect four pairs of outside lines, every pair of outside line can connect many extension sets, this exchange by insert two ends be parallel with the microphone BM of normally closed push button switch K handset transmitter, send words preamplifier IC 1 (LM386), send words power amplifier IC2 (TDA2003), send and be subjected to speech phase control switch IC circuit 3, talked about amplifier IC5 (LM386) and stabilized voltage power supply is formed, wherein stabilized voltage power supply is made up of power transformer T1, rectifier bridge ZL and integrated regulator IC0 (7806), IC6 (7812).At talk line L1, L2 and being talked about is provided with one and is controlled by and send the anti-interference thick film circuit IC4 that is subjected to speech phase control switch IC circuit 3 between the amplifier IC5, it is connected to talk line L1 by an input, the coupling capacitance C1 of L2, resistance R 1 series connection one output is connected to be talked about amplifier IC5 and cross-over connection and has to be controlled by and send the electronic switch VT3 (9013) that is subjected to one of speech phase control switch IC circuit 3 to be talked about locking circuit to form, this electronic switch VT3 also is controlled by input and is connected to talk line L1, the end span of L2 is connected to be controlled by and send another that be subjected to speech phase control switch IC circuit 3 to be talked about the negative feedback logarithm detecting amplifier IC4-1 (LM386) of locking circuit and the circuit of voltage doubling rectifing circuit cascade, above-mentioned two are talked about locking circuit is respectively electronic switch VT4, VT5 (being 9013), voltage doubling rectifing circuit is by diode VD5, VD6, capacitor C 2 and resistance R 2 are formed.And send be subjected to speech phase control switch IC circuit 3 be one by be connected to send words preamplifier IC 1 input 2 cross-over connections have send words locking circuit negative feedback logarithm detecting amplifier IC3-1 (LM741), voltage doubling rectifing circuit, input is serially connected with electronic switch VT1 (LM9013) and the two-stage inverter ic 3-2 of clamp voltage stabilizing didoe VD0, the sound control thick film circuit that IC3-3 (being CD4069) cascade is formed, above-mentioned voltage doubling rectifing circuit is by diode VD1, VD2, capacitor C 0 and resistance R 0 are formed, the output 8 of prime inverter ic 3-2 is connected to the control end 2 of anti-interference thick film circuit IC4, the output 9 of back level inverter ic 3-3 is connected to the electronic switch VT0 (9013) that the control locking send words power amplifier IC2 input 2, send the words locking circuit to be made up of the voltage doubling rectifing circuit and electronic switch VT2 (9013) cascade of band T type resistance attenuator, voltage doubling rectifing circuit is by diode VD3, VD4, capacitor C 3 and resistance R 3, R4, R5 forms.Send another input of the negative feedback logarithm detecting amplifier IC3-1 that be not connected to by speech phase control switch IC circuit 3 to send the words locking circuit to be circumscribed with adjustable resistance RP2, guaranteeing to send under the complete prerequisite of speech joint, adjust the detection sensitivity that adjustable resistance RP2 reduces negative feedback logarithm detecting amplifier IC3-1 as far as possible, can relatively reduce the environmental noise influence of sending the talking path.And clamp voltage stabilizing didoe VD0 is set, can suppress to set of the work influence of the environmental noise of level to electronic switch VT1 among the sound control thick film circuit IC3.
When exchange is static, normally closed push button switch K seals microphone BM, any noise all can not enter and send the talking path, do not seal microphone BM even press normally closed push button switch K, when exchange is static, sending and being subjected to speech phase control switch circuit is that electronic switch VT1 among the sound control thick film circuit IC3 is in cut-off state all the time, sound control thick film circuit IC3 the 8th pin output low level is to anti-interference thick film circuit IC4 the 2nd pin, make and talked about locking circuit VT4, VT5 is in cut-off state, unlatching is subjected to the talking path, simultaneously, sound control thick film circuit IC3 the 9th pin output high level is to controlling the electronic switch VT0 that locking send words power amplifier IC2 input 1, make electronic switch VT0 be in conducting state, locking send the talking path.Be in when being exchange static state and talked about listening state, can receive ext instruction at any time and call out.At this moment, if being arranged on talk line L1, the L2, the interference signal voltage below 150 millivolts transports to anti-interference thick film circuit IC4 the 5th pin, through negative feedback logarithm detecting amplifier IC4-1 detect to amplify and diode VD5, VD6, capacitor C 2 and resistance R 2 voltage multiplying rectifiers after direct voltage can not unlocking electronic switch VT3, interference signal is suppressed effectively.Adjust adjustable resistance RP3, can adjust interference signal and suppress level threshold.
In case extension set is sent the voice signal voltage about 2 volts here, transport to anti-interference thick film circuit IC4 the 5th pin behind the interference signal voltage superposition below 150 millivolts on it and circuit L1, the L2, amplify the direct voltage unlocking electronic switch VT3 after the rectification after testing, voice signal voltage and interference signal voltage are transported to through coupling capacitance C1, resistance R 1 and the electronic switch VT3 that opens with big signal to noise ratio and entered by speech amount potentiometer RP1 to be talked about path, are amplified the back and promote loud speaker BL sounding by talking about amplifier IC5.Because signal to noise ratio is big, interference signal be can't hear.Suitably adjust the time constant that parameter determined of resistance R 2 and capacitor C 2, can make electronic switch VT3 be lower than to be in conducting state and to allow it to enter when 150 millivolts or frequency are lower than 300 hertz and be subjected to the talking path in the voice signal voltage instantaneous, to keep the conversation syllable complete, audio voltage on the loud speaker BL is also transported to sound control thick film circuit IC3 the 6th pin simultaneously, make the electronic switch VT2 conducting of being talked about locking circuit, short circuit negative feedback logarithm detecting amplifier IC3-1 input, making inverter ic 3-3 is sound control thick film circuit IC3 the 9th pin output high level, make electronic switch VT0 be in conducting state, locking send the talking path reliably, the sound of being talked about that prevents effectively that loud speaker BL from sending enters through exchange microphone BM and send the talking path, opens reliably simultaneously and is subjected to the talking path.The extension set speech finishes, and electronic switch VT3 is in cut-off state immediately, and loud speaker BL is sounding not.
In exchange and extension set communication process, normally closed push button switch K presses all the time.The voice signal that exchange send when words microphone BM picks up one the tunnel is transported to sound control thick film circuit IC3 the 2nd pin after sending words preamplifier IC 1 and amplifying, make electronic switch VT1 conducting, inverter ic 3-2 is sound control thick film circuit IC3 the 8th a pin output high level, by being talked about locking circuit VT4, the VT5 locking is subjected to the talking path, in fact be subjected to the unlatching of talking path and locking by sending talking path control, simultaneously, inverter ic 3-3 is sound control thick film circuit IC3 the 9th a pin output low level, the talking path is sent in unlatching, another road voice signal voltage that send after words preamplifier IC 1 is amplified is amplified, by the voice signal voltage via line L1 of line transformer T2 with the 15-20 volt through sending words power amplifier IC2, L2 transports to extension set.After exchange had been said in short, exchange was in static state again, promptly was in to be talked about listening state, opened and was subjected to the talking path, and locking send the talking path, guaranteed to realize the duplex conversation between exchange and the extension set.
Claims (2)
1, a kind of wired duplex intercommunication telephone exchange that amplifies, by insert two ends be parallel with the microphone of normally closed push button switch handset transmitter, send the words preamplifier, send the words power amplifier, send and be subjected to speech phase control switch circuit, talked about amplifier and stabilized voltage power supply is formed, it is characterized in that:
1.1 at talk line and talked about and be provided with one between the amplifier and be controlled by and send the anti-interference thick film circuit that is subjected to speech phase control switch circuit, the coupling circuit that it is connected to talk line by the input output of connecting is connected to and is talked about amplifier and cross-over connection is formed by an electronic switch of being talked about locking circuit of speech phase control switch circuit by being controlled by to send, and this electronic switch also is controlled by a end span that input is connected to talk line and is connected to be controlled by and send another that be subjected to speech phase control switch circuit to be talked about the negative feedback logarithm detecting amplifier of locking circuit and the circuit of voltage doubling rectifing circuit cascade;
1.2 above-mentionedly send that to be subjected to speech phase control switch circuit be one to have and send negative feedback logarithm detecting amplifier, voltage doubling rectifing circuit, the input of words locking circuit to be serially connected with the sound control thick film circuit that the electronic switch of clamp voltage stabilizing didoe becomes with two-stage inverter stage joint group by being connected to the input cross-over connection of sending the words preamplifier, the output of its prime inverter is connected to the control end of anti-interference thick film circuit, and the output of back level inverter is connected to the electronic switch that the control locking send words power amplifier input.
2, wired duplex as claimed in claim 1 intercommunication telephone exchange that amplifies, it is characterized in that sending formed by the voltage doubling rectifing circuit and an electronic switch cascade of band T type resistance attenuator by the words locking circuit that send of speech phase control switch circuit, and another input that is not connected to the negative feedback logarithm detecting amplifier that send the words locking circuit is circumscribed with adjustable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97224824 CN2318771Y (en) | 1997-08-22 | 1997-08-22 | Wire duplex loud-speaker intercome telephone switchboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97224824 CN2318771Y (en) | 1997-08-22 | 1997-08-22 | Wire duplex loud-speaker intercome telephone switchboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2318771Y true CN2318771Y (en) | 1999-05-12 |
Family
ID=33939041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97224824 Expired - Fee Related CN2318771Y (en) | 1997-08-22 | 1997-08-22 | Wire duplex loud-speaker intercome telephone switchboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2318771Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112713777A (en) * | 2021-01-15 | 2021-04-27 | 赣州市正途科技有限公司 | Hydroelectric power supply low-voltage load working circuit |
-
1997
- 1997-08-22 CN CN 97224824 patent/CN2318771Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112713777A (en) * | 2021-01-15 | 2021-04-27 | 赣州市正途科技有限公司 | Hydroelectric power supply low-voltage load working circuit |
| CN112713777B (en) * | 2021-01-15 | 2022-09-16 | 国网上海市电力公司 | Hydroelectric power supply low-voltage load working circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |