CN2426998Y - Infrared radio bidirectional languages teaching apparatus - Google Patents

Abstract

The utility model discloses an infrared radio bidirectional language teaching device. Infrared signals received by an earphone of the utility model are treated through photoelectric conversion and preamplification, then input for killer amplification, FM demodulation and power amplification by a demodulating input foot of an infrared receiving special IC UE706 or UE705 or UE706A, and finally sent by a power output foot to a speaker for sounding. The utility model has the advantages of no need of wiring indoors, low cost, low investment, convenient installation and operation, stable and reliable performance, little power consumption, voice bidirectional transmission, good teaching effect, etc.

Description

Infrared radio bi-directional language instructional device

The utility model relates to a kind of audiovisual teaching equipment, relates in particular to a kind of electrochemical language teaching equipment.

Existing language teaching equipment adopts wire transmission mode mostly, and inside plant is grown thickly, and the mounting arrangements complexity needs decoration renovation to be carried out in the classroom, the expense costliness.And equipment self is complex structure also, and cost height, power consumption are big, and can not realize the transmitted in both directions voice between student, teacher, has significant limitation.

But the purpose of this utility model just provides transmitted in both directions language between a kind of teacher, student, does not need in indoor a large amount of wirings, and cost is low, cost saving, power consumption new infrared wireless two-way language teaching few, easy to install.

For achieving the above object, the technical solution adopted in the utility model is: a kind of infrared radio bi-directional language instructional device, by infrared transmitter, the teacher uses earphone and wireless microphone, compositions such as earphone that several students use and wireless microphone, its design feature is: the infrared signal that earphone is received is after opto-electronic conversion, preposition amplification, demodulation input pin input the carrying out amplitude limit that meets infrared reception special IC UE706 or UE705 or UE706A amplifies, and connects the loudspeaker sounding by the power output pin after FM demodulation, the power amplification.

The infrared reception special IC of above-mentioned earphone also is connected the deaccentuator that become by resistance, capacitance series through the demodulation output pin with the power amplification input pin.

The infrared reception special IC of above-mentioned earphone also is connected to peripheral squelch circuit, the formation of this squelch circuit is mainly: the noise elimination of integrated circuit suppresses the charge-discharge circuit of pin connecting resistance, electric capacity parallel connection, noise elimination suppresses pin simultaneously through two detector diode ground connection, connect coupling capacitance between two detections, two utmost points, another utmost point of this electric capacity connects the noise voltage output pin of integrated circuit.

Above-mentioned student has a controlled switch that is controlled by teacher's telechiric device in the infrared transmitter with microphone, after teacher's telechiric device send the BCD encoder encodes by numeric keypad key entry coded signal, be modulated into infrared signal by infrared driver, by the luminous outside propagation of infraluminescence pipe; Controlled switch on student's microphone receives that this coding infrared signal is converted to the binary-coded decimal electric signal by photoelectric conversion tube, after amplifier amplifies, send comparer relatively, the output terminal of comparer and the base stage of electronic switch are joined, and the two poles of the earth in addition of electronic switch are serially connected with in the power supply supply lines of microphone.

The BCD scrambler of above-mentioned telechiric device is special IC UE1601, and the comparer of controlled switch is special IC UE1602.

Below in conjunction with the drawings and specific embodiments the utility model is done to describe in further detail.

Fig. 1 is the utility model one-piece construction block diagram.

Fig. 2 is that the infrared reception special IC of the utility model adopts the earphone of the embodiment of UE706 to form circuit diagram.

Fig. 3 is the built-up circuit block diagram of the utility model one embodiment student's microphone controlled switch and teacher's telechiric device.

Fig. 1 and Fig. 2 illustrate, the utility model one embodiment specifically constitutes: a kind of by infrared transmitter 1, the teacher uses earphone 2 and wireless microphone 3, in the infrared radio bi-directional language instructional device that earphone 2 that several students use and wireless microphone 3a etc. constitute, the infrared signal that earphone 2 is received is after (opto-electronic conversion and pre-amplification circuit 20 carry out) opto-electronic conversion and preposition amplification, the demodulation input pin that connects infrared reception special IC 17 (UE706) is 3. imported and is carried out amplitude limit and amplify, the FM demodulation connects loudspeaker 4 sounding by power output pin , after the power amplification.

Fig. 2 illustrates, and 8. the infrared reception special IC 17 of the earphone 2 of the utility model embodiment also is connected by resistance R with power amplification input pin through the demodulation output pin ₁₆Capacitor C ₃₁The deaccentuator 5 that is concatenated into.

Fig. 2 also illustrates, and the infrared reception special IC 17 of the earphone 2 of the utility model embodiment also is connected to peripheral squelch circuit 6, and the formation of this squelch circuit 6 is mainly: the noise elimination of integrated circuit 17 suppresses pin Connecting resistance R ₁₉, capacitor C ₁₁Charge-discharge circuit in parallel, noise elimination suppresses pin Simultaneously through two detector diode D ₆, D ₇Ground connection, two detector diode D ₆, D ₇Between connect coupling capacitance C ₂₀, C ₂₀Another utmost point of electric capacity connects the noise voltage output pin of integrated circuit 17

The principle that noise elimination suppresses is: when no infrared signal is launched, infrared reception special IC 17 no signals input will have noise to produce in the circuit 17.When having big noise to occur,

One noise voltage is arranged, D on the pin ₆During conducting, make the capacitor C of charge-discharge circuit ₁₁Discharge, noise elimination suppresses pin

Voltage descends, and the interior switch of sheet (integrated circuit 17) disconnects, and power amplification quits work, and suppresses noise and produces.And during operate as normal, the noise voltage output pin

Switch closure in the last voltage free from noise, sheet enters normal power amplifier state.

Pin also can be through a potentiometer RW ₃Connect direct supply V _CCPositive pole passes through RW ₃To regulate its initial DC voltage, make squelch circuit work in better state.

Recited above is that infrared reception special IC is when adopting UE706, its concrete formation and method of attachment, when adopting UE705 or UE706A if the infrared in force reception special IC of the utility model does not adopt UE706, above-mentioned congenerous pin is identical with the connection of other circuit, peripheral circuit, and just the numbering of pin changes to some extent.

The utility model can be combined into an ear receiver with teacher, student's earphone 2 and microphone 3,3a in force, uses very convenient.

When transmitter 1 connects source of sound 21 (teaching material of broadcasts such as sound-track engraving apparatus, CD or teacher are by the microphone explanation or read aloud text), voice signal is handled emission through transmitter 1, after earphone 2 receives and handles, all students all can know the sound that the loudspeaker 4 of hearing earphone 2 sends, and teacher also can be from the 2 li monitorings of earphone of oneself.The student can answer a question or reads aloud text by teacher's requirement by wireless microphone, and teacher and school (comprising this life) can hear.Can make aural learning, teacher also can in time correct student's pronunciation and intonation.Therefore it is practical two-way voice transmissions instructional device.

The utility model both can use in a classroom, also can be used for the unified audition or the examination in several classrooms, and the infrared transmitter that signal source is transferred to each classroom is issued identical signal to the student and got final product.Certainly also can be used in the school teaching such as non-class of languages courses such as music, song, dramas.

Fig. 1, Fig. 3 illustrate student's microphone 3a of the utility model embodiment, one controlled switch that is controlled by teacher's telechiric device 7 in the infrared transmitter 1 is arranged, the coded signal that teacher's telechiric device 7 is keyed in by numeric keypad 9 is modulated into infrared signal by the 12 luminous outside propagation of infraluminescence pipe by infrared driver 11 after sending BCD scrambler 10 codings; Controlled switch on student's microphone 3a receives that this coding infrared signal is converted to the binary-coded decimal electric signal by photoelectric conversion tube 13, after amplifier 14 amplifies, send comparer 15 relatively, the base stage of the output terminal of comparer 15 and electronic switch 16 is joined, and electronic switch 16 the two poles of the earth in addition is serially connected with in the power supply supply lines of microphone 3a.When the binary-coded decimal electric signal of receiving when comparer 15 was consistent with local coder like this, comparer 15 outputs one high level was to the base stage of electronic switch 16, electronic switch 16 conductings, wireless microphone energized, wireless microphone 3a work; The coding that other student's microphones 3a receives is then inconsistent with local coder, the comparer output low level, and electronic switch can't conducting, and microphone 3a does not work.

By telechiric device 7 and controlled switch, teacher can control student's wireless microphone 3a easily, and for keeping the classroom peace and quiet, teacher can close all microphones; Be a teacher when needing certain learner answering questions problem or reading aloud text, press certain number on the numeric keypad 9 of telechiric device 7, can open corresponding student's letter by telechiric device 7 and controlled switch, also can open two or more students' microphone in case of necessity simultaneously and do the dialogue exercise.Be to talk with mutually between the academics and students, also can talk with mutually between the student.Therefore, it is a controlled two-way voice transmissions device, and teaching efficiency is better.

Fig. 3 also illustrates, and the BCD coding 10 of the telechiric device 7 of the utility model embodiment is special IC UE1601, and the comparer 15 of controlled switch 8 is special IC UE1602.Adopt UE1601 and UE1602 special IC then need not take over what peripheral circuit, working stability, reliable, to make debugging convenient, and power supplys below only adopting 3 volts, voltage is low, power consumption is also extremely low.

The utility model compared with prior art has following obvious advantage:

One, the utility model, does not need to connect up in the classroom as the signal transport vehicle with infrared light, appoints What has the classroom of power supply all can use, and expense only has half of existing wire transmission voice teaching system, Be adapted at promoting in the various kinds of schools of town and country.

Two, both but teacher read the utility model, the student listens, but also the teacher listens, the student reads, also can be complete The full realization talked with between controlled academics and students mutually, and bidirectional dialog between the student is a controllable bidirectional Speech sound teaching apparatus. Student's mispronounce can in time obtain teacher and other students' correction and help, Can keep again the peace and quiet in classroom, teaching efficiency is good.

Three, the ratio of the BCD encoder of earphone infrared signal reception ﹠ disposal, remote control, controlled switch Than device, all adopt special IC, peripheral circuits is made easily this device greatly, transfers Examination is convenient, and stable and reliable for performance, cost is low, and power consumption is low, and operating cost is few.

Claims (5)

1, a kind of infrared radio bi-directional language instructional device, by infrared transmitter (1), the teacher uses earphone (2) and wireless microphone (3), earphone that several students use (2) and wireless microphone formations such as (3a), it is characterized in that: the infrared signal that earphone (2) is received is through opto-electronic conversion, and after the preposition amplification, demodulation input pin input the carrying out amplitude limit that meets infrared reception special IC (17) UE706 or UE705 or UE706A amplifies, the FM demodulation connects loudspeaker (4) sounding by the power output pin after the power amplification.

2, a kind of infrared radio bi-directional language instructional device according to claim 1, it is characterized in that: the infrared reception special IC (17) of earphone (2) also is connected by resistance (R with the power amplification input pin through the demodulation output pin ₁₆), electric capacity (C ₃₁) deaccentuator (5) that is concatenated into.

3, a kind of infrared radio bi-directional language instructional device according to claim 1, it is characterized in that: the infrared reception special IC (17) of earphone (2), be connected to peripheral squelch circuit (6), the formation of this squelch circuit (6) is mainly: the noise elimination of integrated circuit (17) suppresses pin connecting resistance (R ₁₉), electric capacity (C ₁₁) charge-discharge circuit in parallel, noise elimination suppresses pin simultaneously through two detector diode (D ₆, D ₇) ground connection, two detector diode (D ₆, D ₇) between connect coupling capacitance (C ₂₀), this electric capacity (C ₂₀) another utmost point connect the noise voltage output pin of integrated circuit (17).

4, a kind of infrared radio bi-directional language instructional device according to claim 1, it is characterized in that: the student has a controlled switch that is controlled by the interior teacher's telechiric device of infrared transmitter (1) (7) with microphone (3a), teacher's telechiric device (7) is modulated into infrared signal by the luminous outside propagation of infraluminescence pipe (12) by infrared driver (11) after sending BCD scrambler (10) coding by numeric keypad (9) key entry coded signal; Controlled switch on student's microphone (3a) receives that this coding infrared signal is converted to the binary-coded decimal electric signal by photoelectric conversion tube (13), after amplifier (14) amplifies, send comparer (15) relatively, the base stage of the output terminal of comparer (15) and electronic switch (16) is joined, and electronic switch (16) is serially connected with in the power supply supply lines of microphone (3a) at the two poles of the earth in addition.

5, a kind of infrared radio bi-directional language instructional device according to claim 4, it is characterized in that: the BCD scrambler (10) of telechiric device (7) is special IC UE1601, and the comparer of controlled switch (15) is special IC UE1602.

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