CN1045854C - Infrared two-direction speech sound transmission system - Google Patents
Infrared two-direction speech sound transmission system Download PDFInfo
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- CN1045854C CN1045854C CN95111663A CN95111663A CN1045854C CN 1045854 C CN1045854 C CN 1045854C CN 95111663 A CN95111663 A CN 95111663A CN 95111663 A CN95111663 A CN 95111663A CN 1045854 C CN1045854 C CN 1045854C
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- infrared
- amplifier
- classroom
- transmission system
- speech
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Abstract
The present invention is composed of a plurality of infrared interphones for students and a system host machine. The present invention has the technical scheme that an infrared interphone and an infrared head-phone are arranged on each desk in a classroom; the system host machine transmits teacher's speech signals through infrared transmitters arranged on system installation channel plates in the front of the classroom and at the back of the classroom, and the speech signals are received by the students' infrared head-phones; the system host machine receives students' speech signals transmitted by the students' infrared interphones through a plurality of infrared receiving heads arranged in the middle of the classroom; after the system host machine mixes the received students' speech signals and the teacher's speech signals, the speech signals are transmitted to the students for listening. The two-direction speech sound transmission system of the present invention can greatly improve the teaching effect, and the cost of the two-direction speech sound transmission system is low. The present invention is suitable for classrooms of various areas.
Description
A kind of infrared two-direction speech sound transmission system that is used for audio-visual education programme belongs to electricity basic electronic circuit class.
The present existing voice-transmission system that is used for audio-visual education programme in the classroom, it is wired or employing radio wave technology, the former progressively is eliminated, and the latter also is the one-way transmission voice signal, and owing to the radio wave frequency of utilization is restricted and can not be extensive use of, radio wave particularly, not to be vulnerable to contiguous electromagnetic interference on every side, disturb other people wireless device exactly, so, adopt radiotechnics as audio-visual education programme, significant limitation is arranged.
The objective of the invention is, utilize the means of infrared waves as the audio-visual education programme transferring voice, and make this voice-transmission system realize transmitted in both directions, promptly the voice of Faculty and Students can transmitted in both directions.
The solution of the present invention is, form by infrared intercom and a system host that several students use, each desk is provided with an infrared intercom and infrared head-phone in the classroom, system host is installed the voice signal of the infrared transmitter emission teacher on the frid by system before and after being laid in the classroom, infrared head-phone by the student is listened to, system host receives student's voice signal that the infrared intercom of students is launched by being laid in several middle infrared receiving terminals of classroom, and system host is listened to being transmitted to the student after student's voice signal that receives and number teacher's the voice signal mixing again.
Advantage of the present invention is, uses the infrared waves transferring voice, is not subject to external interference, also do not disturb others' wireless device, particularly two-direction speech sound transmission system, can improve teaching efficiency greatly, and cost is low, is suitable for the classroom of various areas.
The present invention has following accompanying drawing, and accompanying drawing is made brief description:
Accompanying drawing 1 is that the present invention is provided with figure in the classroom.
Accompanying drawing 2 is electrical principle block diagrams of the present invention.
Accompanying drawing 3 is system host infrared transmitter basic circuit diagrams of the present invention.
Accompanying drawing 4 is student's intercom infrared transmitter basic circuit diagrams of the present invention.
Accompanying drawing 5 is basic circuit diagrams of infrared receiving terminal of the present invention.
Accompanying drawing 6 is basic circuit diagrams of infrared head-phone of the present invention.
Describe operation principle of the present invention and embodiment in detail below in conjunction with accompanying drawing:
Accompanying drawing 1 is that the present invention is provided with figure in the classroom, among the figure in the classroom each desk 15 be provided with an infrared intercom 14 and infrared head-phone 16, system host 18 is installed the voice signal of the infrared transmitter 19 emission teachers on the frid 22 by system before and after being laid in the classroom, infrared head-phone 16 by the student is listened to, system host 18 receives student's voice signal that the infrared intercom 14 of students is launched by being laid in several middle infrared receiving terminals 20 of classroom, being transmitted to the student after system host 18 mixes student's voice signal that receives and teacher's voice signal again listens to, 12 is teacher dais among the figure, the 13rd, remote operation console, the 17th, equipment storing compartment, the 21st, system cable; Accompanying drawing 2 is electrical principle block diagrams of the present invention, infrared intercom 14 is made of microphone input audio frequency amplifier 1, speech modulator 2 and infrared transmitter 3 among the figure, system host 18 is by teacher's voice mixing amplifier 5, electronic switch editor 6, the speaker modulates output 7 and infrared transmitter 19 constitutes, infrared receiving terminal 20 receives the signal of infrared transmitter 3, after 5 amplifications of speech mixer amplifier and 7 modulation of speech modulator, launch again by infrared transmitter 19, listen to for all infrared head-phones 16 in the classroom, the 10th, power supply; Accompanying drawing 3 is system host infrared transmitter basic circuit diagrams of the present invention, infrared transmitter 19 is exported modulated voice signal by triode follower Q1 among the figure, one the tunnel send triode Q3 to follow amplification, after amplifying, launches power amplifier Q4 again by four infrared tube D7-D10, another road is having or not by signal indicator tube D5, D6 index signal after triode follower Q2, operational amplifier IC1, IC2 amplify, D11 among the figure is the emission state indicator tube, and IC3 is an integrated stable voltage circuit; Accompanying drawing 4 is student's intercom infrared transmitter basic circuit diagrams of the present invention, infrared intercom 14 send the speech of fork-like farm tool used in ancient China to carry out frequency modulation(FM) by 4 couples of MIC of frequency modulation integrated circuit (IC), after limiting amplifier IC5, IC6 shaping, send amplifier Q4, Q5 to carry out power amplification, after band pass filter BPF1 filtering, launch by infrared tube D11-D13; Accompanying drawing 5 is basic circuit diagrams of infrared receiving terminal of the present invention, infrared receiving terminal 20 receives infrared signal after send impedance matching box Q6 after the band pass filter BPF2 filtering by infrared tube D14-D16, amplifies through amplifier Q7 and delivers to fm demodulation integrated circuit (IC) 7 demodulation output speech; Accompanying drawing 6 is basic circuit diagrams of infrared head-phone of the present invention, infrared head-phone 16 receives infrared signal by infrared tube D17-D19 after amplifier Q8, Q9 amplification and frequency selective amplifier Q10 send fm demodulation integrated circuit (IC) 9 to be demodulated into voice signal after amplifying, and exports voice signal by earphone Y after power amplifier IC10 power amplification; Application-specific integrated circuit (ASIC) used in the present invention all is commercially available, and the capacitance resistance ware in the circuit is that this integrated circuit is needed.
Claims (6)
1, a kind of infrared two-direction speech sound transmission system that is used for audio-visual education programme, form by infrared intercom and a system host that several students use, it is characterized in that, each desk (15) is provided with an infrared intercom (14) and infrared head-phone (16) in the classroom, by system before and after being laid in the classroom voice signal of infrared transmitter (19) the emission teacher on the frid (22) is installed by system host (18), infrared head-phone (16) by the student is listened to, system host (18) receives student's voice signal that the infrared intercoms of student (14) are launched by being laid in middle several infrared receiving terminals (20) in classroom, and system host (18) is transmitted to the student to the mixing of student's voice signal that receives and teacher's voice signal through infrared transmitter (19) more again and listens to.
2, by the described voice-transmission system of claim 1, it is characterized in that, infrared intercom (14) is made of microphone input audio frequency amplifier (1), speech modulator (2) and infrared transmitter (3), system host (18) is made of teacher's voice mixing amplifier (5), electronic switch editor (6) and infrared transmitter (19), infrared receiving terminal (20) receives the signal of infrared transmitter (3), after speech mixer amplifier (5) amplification and speech modulator (7) modulation, launch again, listen to for all infrared head-phones (16) in the classroom by infrared transmitter (19).
3, by the described voice-transmission system of claim 1, it is characterized in that, infrared transmitter (19) is exported modulated voice signal by triode follower Q1, one the tunnel send triode Q3 to follow amplification, amplify the back by four infrared tube D7-D10 emissions through power amplifier Q4 again, another road after triode follower Q2, operational amplifier IC1, IC2 amplification by signal indicator tube D5, D6 index signal.
4, by the described voice-transmission system of claim 1, it is characterized in that, infrared intercom (14) send the speech of fork-like farm tool used in ancient China to carry out frequency modulation(FM) by 4 couples of MIC of frequency modulation integrated circuit (IC), after limiting amplifier IC5, IC6 shaping, send amplifier Q4, Q5 to carry out power amplification, after band pass filter BPF1 filtering, launch by infrared tube D11-D13.
5, by the described voice-transmission system of claim 1, it is characterized in that infrared receiving terminal (20) receives infrared signal by infrared tube D14-D16 and delivers to fm demodulation integrated circuit (IC) 7 demodulation output speech after send impedance matching box Q6 to amplify through amplifier Q7 after the logical Lu ripple device BPF2 filtering of band.
6, by the described voice-transmission system of claim 1, it is characterized in that, infrared head-phone (16) receives infrared signal by infrared tube D17-D19 after amplifier Q8, Q9 amplification and frequency selective amplifier Q10 send fm demodulation integrated circuit (IC) 9 to be demodulated into voice signal after amplifying, and exports voice signal by earphone after power amplifier IC10 power amplification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95111663A CN1045854C (en) | 1995-06-16 | 1995-06-16 | Infrared two-direction speech sound transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95111663A CN1045854C (en) | 1995-06-16 | 1995-06-16 | Infrared two-direction speech sound transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1139847A CN1139847A (en) | 1997-01-08 |
| CN1045854C true CN1045854C (en) | 1999-10-20 |
Family
ID=5078926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95111663A Expired - Fee Related CN1045854C (en) | 1995-06-16 | 1995-06-16 | Infrared two-direction speech sound transmission system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1045854C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104382277B (en) * | 2014-11-24 | 2017-08-25 | 广西大学 | The communication helmet communicated for low-latitude flying |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1101446A (en) * | 1993-01-21 | 1995-04-12 | Dsp飒露神思国际公司 | Computerized system for teching speech |
-
1995
- 1995-06-16 CN CN95111663A patent/CN1045854C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1101446A (en) * | 1993-01-21 | 1995-04-12 | Dsp飒露神思国际公司 | Computerized system for teching speech |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1139847A (en) | 1997-01-08 |
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| 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 |