CN204929141U - Campus broadcasting is talkbacked and monitor system - Google Patents
Campus broadcasting is talkbacked and monitor system Download PDFInfo
- Publication number
- CN204929141U CN204929141U CN201520623245.XU CN201520623245U CN204929141U CN 204929141 U CN204929141 U CN 204929141U CN 201520623245 U CN201520623245 U CN 201520623245U CN 204929141 U CN204929141 U CN 204929141U
- Authority
- CN
- China
- Prior art keywords
- relay
- broadcast
- amplification circuit
- broadcast singal
- broadcasting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Telephonic Communication Services (AREA)
Abstract
Campus broadcasting is talkbacked and monitor system be one kind for can the monitoring of school and enterprise design, can two -wayly telephone again, can also realize the multifunction system of single -point, subregion or comprehensive broadcasting, mainly include capacitor microphone, preamplification circuit, relay, broadcast singal feed through capacitor, broadcast audio -frequency transformer, select switch, double pole double throw functional switch and level pressure power amplifier are thrown to hilted broadsword no. 3, establish ties with broadcasting audio -frequency transformer after preamplification circuit, relay and broadcast singal bypass capacitor three in the audio amplifier of classroom are parallelly connected, alternating current signal and D. C. Current detecting circuit are constituteed to they, can adapt to alternating current signal and direct current on the transmission line automatically again, make preamplification circuit and the work in turn of broadcasting audio -frequency transformer, broadcasting of completion system and monitor process.
Description
Technical field
The present invention relates to wired broadcasting technical field, particularly a kind of containing locellus broadcast and the classroom broadcast system of monitor function, be a kind of use in school or enterprise locellus broadcast, two-way intercommunication and sound monitoring teaching and manage auxiliary equipment.
Background technology
In school's teaching management, often relate to the situation such as quality of instruction inspection or classroom instruction inspection, whether such as each class attends class on time, and whether the classroom instruction time is utilized effectively, the LOGO of teacher whether specification, science.Conventional method has three kinds: the first is listened to the teacher to scene; Second method adopts wireless microphone to monitor; The third method adopts cable microphone to carry out acoustic.Wherein, first method fixedly can only listen a class, can not understand the classroom instruction situation of each class of whole school in time; Second method troublesome poeration, needs frequent mobile microphone and receiver, also needs often to change battery, constantly adjustment receiver frequency, and tone color is poor, and noise is large.The third method talker can not be far from microphone, otherwise sound is little, and noise is large.Also have a kind of bus type addressing broadcasting system at present, can sectorization broadcast and spot radio be carried out, but do not possess fixed point to monitor function of making peace.
Utility model content
The object of this invention is to provide broadcast intercommunication and the monitoring system of a kind of school or enterprise's use, this system can solve locellus broadcast, the two-way technical problem to indoor sound monitoring of making peace.
Technical problem to be solved by this invention is achieved through the following technical solutions: system comprises capacitor microphone, pre-amplification circuit, relay, broadcast singal shunt capacitance, broadcast audio transformer, SP3T selector switch, dpdt double-pole double-throw (DPDT) functional switch and level pressure power amplifier part; Pre-amplification circuit, relay, broadcast singal by-pass capacitor and broadcast audio transformer are set in the audio amplifier of classroom, after pre-amplification circuit, relay and broadcast singal by-pass capacitor three parallel connection again with broadcast audio transformer series, composition AC signal and D.C. current detecting circuit, AC signal on automatic adaptation transmission line and direct current, make pre-amplification circuit and broadcast audio transformer take turns to operate; During system use broadcast capability, it transmission line is AC signal, broadcast singal by-pass capacitor bypasses the operating voltage of pre-amplification circuit and relay, pre-amplification circuit and relay quit work, monitor function stops, and relay normally open contact disconnects, and broadcast singal is all carried on broadcast audio transformer, the normal work of broadcast, classroom speaker can pronounce; During system use monitor function, main signal on transmission line is direct current, the operating voltage of broadcast singal by-pass capacitor to pre-amplification circuit and relay does not play short circuit effect, pre-amplification circuit works, and relay adhesive, relay normally open contact path, classroom speaker can not sounding, monitoring signal is added on transmission line by the normally opened contact of relay, and then be transported to the input jack of level pressure power amplifier, by monitoring sound horn after level pressure power amplifier amplifies, complete snoop procedure.
Technique scheme has following beneficial effect: for school and enterprise provide simple electronic circuit, and realizing one can monitor, again can two-way call, can also realize the multifunction system of single-point or subregion or broadcast comprehensively.
Accompanying drawing explanation
The present invention has following 2 width accompanying drawings:
Fig. 1 is pre-amplification circuit and the classroom audio amplifier internal circuit configuration figure thereof of native system;
Fig. 2 is the circuit diagram of native system.
Marked each numeral is expressed as follows respectively in the accompanying drawings:
1, capacitor microphone; 2, input coupling capacitance; 3, polarization resistance; 4, biasing resistor; 5, transistor one; 6, transistor two; 7, collector resistance; 8, decoupling resistance; 9, output coupling capacitance; 10, directed diode; 11, monitoring signal output; 12, decoupling capacitance; 13, emitter resistance one; 14, emitter bypass electric capacity; 15, emitter resistance two; 16, filter capacitor; 17, pre-amplification circuit; 18, relay; 19, audio amplifier positive terminal; 20, broadcast audio transformer; 21, classroom speaker; 22, relay normally open contact; 23, broadcast singal shunt capacitance; 24, audio amplifier negative terminal; 25, classroom audio amplifier part; 26, transmission line; 27, SP3T selector switch; 28, same line omission mark; 29, light-emitting diode; 30, monitoring signal shunt capacitance; 31, current-limiting resistance; 32, choking-winding; 33, double-point double-throw switch upper contact; 34, dpdt double-pole double-throw (DPDT) functional switch; 35, double-point double-throw switch lower contact; 36, DC power supply exit; 37, broadcast singal output; 38, loudspeaker are monitored; 39, audio frequency transformer; 40, volume knob; 41, system host; 42, level pressure power amplifier; 43, power amplifier input jack; 44, transmission line output; 45, transmission line common ground end.
Embodiment
1, according to Fig. 2, system mainly comprises capacitor microphone (1), pre-amplification circuit (17), relay (18), broadcast singal shunt capacitance (23), broadcast audio transformer (20), SP3T selector switch (27), dpdt double-pole double-throw (DPDT) functional switch (34) and level pressure power amplifier (42) part; Connect with broadcast audio transformer (20) again after pre-amplification circuit (17), relay (18) and broadcast singal by-pass capacitor (23) three's parallel connection, the operating voltage of relay (18) i.e. the operating voltage of pre-amplification circuit (17), when system uses monitor function, main signal on transmission line is direct current, and the operating voltage of pre-amplification circuit (17) and relay (18) provides by after the primary coil step-down of broadcast audio transformer (20).
2, when one or many or all SP3T selector switches (27) dial at upper contact, and dpdt double-pole double-throw (DPDT) functional switch (34) is also dialled when upper contact, the broadcast output signal of level pressure power amplifier (42) delivers to one or more or whole classroom audio amplifier part (25), because broadcast singal is AC signal, broadcast singal shunt capacitance (23) is unimpeded to broadcast singal, broadcast singal shunt capacitance (23) falls the operating voltage short circuit of relay (18) and pre-amplification circuit (17), relay (18) does not work, normally opened contact (22) is opened a way, broadcast singal is all carried on broadcast audio transformer (22), the normal work of broadcast, now, by the operation of SP3T selector switch (27) quantity, system can realize single-point or subregion or broadcast capability comprehensively.
3, when a SP3T selector switch (27) is dialled at lower contact, remaining SP3T selector switch (27) is all dialled at intermediate contact, and double-point double-throw switch (34) is also dialled when lower contact, the direct current of DC power supply exit (36) is through choking-winding (32), current-limiting resistance (31), light-emitting diode (29), transmission line (26), relay (18) and pre-amplification circuit (17) is delivered to after broadcast audio transformer (20) step-down, for pre-amplification circuit (17) and relay (18) provide power supply, now light-emitting diode (29) is lighted, show that foldback circuit is logical, due to transmission line (26) being direct current, broadcast singal shunt capacitance (23) is not smooth to direct current, so the operating voltage of broadcast singal shunt capacitance (23) to relay (18) and pre-amplification circuit (26) does not play short circuit effect, relay (18) and pre-amplification circuit (26) normally work, relay adhesive (18), normally opened contact (22) path, capacitor microphone (1) receives sound in classroom, monitoring signal after pre-amplification circuit (17) amplifies is loaded on transmission line (26) by relay normally open contact (22), superpose with the direct voltage on transmission line (26), monitoring signal is coupled to power amplifier input jack (43) through monitoring signal shunt capacitance (30), monitoring signal passes through broadcast singal output (37) after level pressure power amplifier (42) amplifies, double-point double-throw switch (34) signal loading on audio frequency transformer (39), by making monitoring loudspeaker (38) work after transformation, realize monitor function.
4, utilize point cast function and monitor function, by converting SP3T selector switch (27) and dpdt double-pole double-throw (DPDT) functional switch (34) simultaneously, the intercommunication function between classroom and control room can be realized.
5, when system is in broadcast state, monitor loudspeaker (38) to use as microphone, monitor after loudspeaker (38) receive the voice signal of announcer and convert the signal of telecommunication to, after audio frequency transformer (39) boosting, broadcast signal is transported to power amplifier input jack (43) by double-point double-throw switch upper contact (33) left side contact, be transported on transmission line by double-point double-throw switch upper contact (33) right side contact after level pressure power amplifier (42) amplifies, then be transported to each classroom audio amplifier sounding.
6, due to the classroom of actual school or operating room's quantity of enterprise more, all do not draw with transmission line (26), SP3T selector switch (27), light-emitting diode (29) and monitoring signal shunt capacitance (30) same line part in Fig. 2, replace with same line omission mark (28).
7, according to Fig. 1, the effect of directed diode (10) ensures that the electric power polarity of pre-amplification circuit (17) is upper just lower negative, when audio amplifier positive terminal (19) and audio amplifier negative terminal (24) connect inverse time with transmission line, pre-amplification circuit (17) also can normally work.
8, all adopt electrolytic capacitor according to the capacitor in Fig. 1, figure, input coupling capacitance (2) is 2.2 μ F/25V; Output coupling capacitance (9) adopts 22 μ F/25V two; Decoupling capacitance (12) is 100 μ F/25V; Emitter bypass electric capacity (14) is 220 μ F/10V; Filter capacitor (16) is 220 μ F/25V; Broadcast singal shunt capacitance (23) adopts 22 μ F/250V two; Resistor all adopts 1/8W carbon film resistor, and polarization resistance (3) is 47K; Biasing resistor (4) is 2.2M; Collector resistance (7) is 10K; Decoupling resistance (8) is 1K; Emitter resistance one (13) is 5.1K; Emitter resistance two (15) 2.2K; Transistor one (5) and transistor two (6) use epoxy transistor, and model is 9013; The model of 4 directed diodes (10) is 1N4007; JRX-13F type direct current 12V relay selected by relay (18), and coil D.C. resistance is 600 Ω; Relay normally open contact (22) operating voltage is alternating current 220V, and contact operating current is greater than interchange 1A; The elementary operating voltage of broadcast audio transformer (20) is 120V, and D.C. resistance is 600 Ω, and secondary output impedance is 8 Ω; Classroom speaker (21) impedance is 8 Ω, and power is 5W, and bore is 120mm.
9, according to Fig. 2, SP3T selector switch (27) is miniature third gear toggle switch; Light-emitting diode (29) is φ 3 green LED; Monitoring signal shunt capacitance (30) is 22 μ F/25V electrochemical capacitors; Current-limiting resistance (31) is 2W100 Ω metalfilmresistor; Choking-winding (32) is 0.2H; Dpdt double-pole double-throw (DPDT) functional switch (34) is toggle switch; The voltage of DC power supply exit (36) is 24V; The voltage of broadcast singal output (37) is 0-120V; Monitoring loudspeaker (38) is 0.5W8 Ω; Audio frequency transformer (39) elementary operating voltage is 120V; Level pressure power amplifier (42) is 100W, and level pressure value is 120V.
10, according to Fig. 2, transmission line (26) adopts super Category-5 twisted pair, 7 cores in its 8 core are applied to 7 classrooms respectively, be connected on classroom audio amplifier positive terminal (19), last root uses as common ground line, be connected on audio amplifier negative terminal (24), on the transmission line output (44) that the other end of twisted-pair feeder is connected on system host (41) respectively and transmission line common ground end (45).
11, the mode of connection in other classrooms is identical with embodiment 10.
Claims (3)
1. campus broadcasting intercommunication and a monitoring system, comprises capacitor microphone, pre-amplification circuit, relay, broadcast singal shunt capacitance, broadcast audio transformer, SP3T selector switch, dpdt double-pole double-throw (DPDT) functional switch and level pressure power amplifier part; Pre-amplification circuit, relay, broadcast singal by-pass capacitor and broadcast audio transformer are set in the audio amplifier of classroom, their composition AC signal and D.C. current detecting circuits, AC signal on automatic adaptation transmission line and direct current, pre-amplification circuit and broadcast audio transformer are taken turns to operate, it is characterized in that: after pre-amplification circuit, relay and broadcast singal by-pass capacitor three parallel connection again with broadcast audio transformer series.
2. campus broadcasting intercommunication according to claim 1 and monitoring system, it is characterized in that: during system use broadcast capability, broadcast singal by-pass capacitor bypasses the operating voltage of pre-amplification circuit and relay, pre-amplification circuit and relay quit work, monitor function stops, relay normally open contact is opened a way, and broadcast audio transformer normally works, and classroom speaker is sound.
3. campus broadcasting intercommunication according to claim 1 and monitoring system, it is characterized in that: during system use monitor function, main signal on transmission line is direct current, broadcast singal by-pass capacitor can not short circuit to the operating voltage of pre-amplification circuit and relay, pre-amplification circuit works, relay adhesive, relay normally open contact path, monitor function is normal, and classroom speaker is noiseless.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520623245.XU CN204929141U (en) | 2015-08-14 | 2015-08-14 | Campus broadcasting is talkbacked and monitor system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520623245.XU CN204929141U (en) | 2015-08-14 | 2015-08-14 | Campus broadcasting is talkbacked and monitor system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204929141U true CN204929141U (en) | 2015-12-30 |
Family
ID=54978234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520623245.XU Expired - Fee Related CN204929141U (en) | 2015-08-14 | 2015-08-14 | Campus broadcasting is talkbacked and monitor system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204929141U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022156153A1 (en) * | 2021-01-19 | 2022-07-28 | 广州市保伦电子有限公司 | Remote broadcast line detection apparatus |
-
2015
- 2015-08-14 CN CN201520623245.XU patent/CN204929141U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022156153A1 (en) * | 2021-01-19 | 2022-07-28 | 广州市保伦电子有限公司 | Remote broadcast line detection apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103260105B (en) | A kind of method and apparatus utilizing the power supply of electronic equipment to power to ANC earphone | |
| CN103237281B (en) | The earphone line control circuit of a kind of mobile terminal and line control method | |
| CN203251411U (en) | Active noise cancellation (ANC) earphone | |
| CN203251412U (en) | Device capable of using power source of electronic equipment to supply power to automatic noise cancellation (ANC) earphone | |
| CN204929141U (en) | Campus broadcasting is talkbacked and monitor system | |
| CN201216024Y (en) | Microphone set device having chairman function | |
| CN208509242U (en) | A kind of voice-grade channel switching realization circuit of digital walkie-talkie | |
| CN204795237U (en) | Intercom system isolation transformer antisidetone circuit | |
| CN206042133U (en) | Key face can number of depositing command telephone | |
| CN203872338U (en) | Electronic switching circuit and portable audio play device | |
| CN203251413U (en) | Electronic apparatus capable of supplying power for automatic noise cancellation (ANC) earphone | |
| CN203492082U (en) | Telephone synchronous bell device | |
| CN201001191Y (en) | Control circuit for automatic mute main external power amplifier by earphone insertion | |
| CN100418113C (en) | Indoor alarm device using wireld TV network as media | |
| CN205039780U (en) | Take dual power supply's dual track audio power amplifier circuit | |
| CN204810528U (en) | Converting circuit based on input of bluetooth audio frequency source | |
| CN206135895U (en) | Intercom terminal's switching device , intercom terminal and intercom system | |
| CN212484514U (en) | Intelligent alarm of dull and stereotyped | |
| CN203761453U (en) | Dual-mode telephone possessing power-off escape function and capable of establishing tripartite conference | |
| CN204616000U (en) | With transformer coupled anti-sidetone duplex intercom | |
| CN202617332U (en) | Network digital audio transmission board and audio network system | |
| CN208386860U (en) | A kind of intelligent earphone for teaching foreign spoken language learning | |
| CN2290152Y (en) | Multichannel bidirection sound transmission machine | |
| CN211181634U (en) | K sings recording equipment with USB interface carries out audio transmission | |
| CN205912243U (en) | Circuit of rapid elimination TV noise |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20161202 Address after: 224002 Yancheng City open road, Jiangsu, No. 50 Patentee after: Yancheng Normal College Address before: 224002 Yancheng City open road, Yancheng Teachers University, Jiangsu, Information Center Patentee before: Feng Yue |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151230 Termination date: 20170814 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |