CN87216712U - Infrared acoustic frequency signal sending machme - Google Patents
Infrared acoustic frequency signal sending machme Download PDFInfo
- Publication number
- CN87216712U CN87216712U CN 87216712 CN87216712U CN87216712U CN 87216712 U CN87216712 U CN 87216712U CN 87216712 CN87216712 CN 87216712 CN 87216712 U CN87216712 U CN 87216712U CN 87216712 U CN87216712 U CN 87216712U
- Authority
- CN
- China
- Prior art keywords
- acoustic frequency
- infrared
- transmitter
- audio signal
- frequency signal
- 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.)
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- 230000005855 radiation Effects 0.000 claims abstract description 5
- 230000005236 sound signal Effects 0.000 claims description 20
- 238000001914 filtration Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- JEDYYFXHPAIBGR-UHFFFAOYSA-N butafenacil Chemical compound O=C1N(C)C(C(F)(F)F)=CC(=O)N1C1=CC=C(Cl)C(C(=O)OC(C)(C)C(=O)OCC=C)=C1 JEDYYFXHPAIBGR-UHFFFAOYSA-N 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
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Abstract
The utility model discloses an infrared acoustic frequency signal transmitter, which is made by that infrared luminous tubes [D1] of circuits can realize the infrared radiation of acoustic frequency signals when acoustic frequency signals of a television set feed in the local circuits. After the existing TV sets are matched with the utility model to use, the work and the rest of other people can not be influenced by the television audience who watch television programs wearing infrared wireless earphones; meanwhile, the utility model is also suitable for the other sounding devices such as radio-receiver recorders. The infrared acoustic frequency signal transmitter and the earphone which is matched with the infrared acoustic frequency signal transmitter to use have the advantages that the structure is simple; the cost of the whole set is low, which is less than 10% of the whole set cost of the existing acoustic frequency transmitter and acoustic frequency receiver which is matched with the acoustic frequency transmitter to use.
Description
The utility model relates to a kind of radio transmitter.
In home A/V equipment popularizes, how to eliminate the interference problem of sound, paid more and more attention to normal life.Scheme commonly used is according to electromagnetic induction principle, in certain space, constitute a loop with lead, with the audio signal feed-in, form an audio frequency alternating magnetic field in the space that this lead centered on, the intensity in magnetic field is relevant with the size of loop coil, shape, the number of turn, relative position, permeability and feed-in loop current size.People utilize the earphone of devices such as induction coil and power amplifier are housed just can receive relevant audio signal in above-mentioned space, thereby avoid interference.
In addition, also adopt modulated electromagnetic wave to transmit and receive device and come transmitting audio signal, but this transmission means has certain interference to other radio waves, application is restricted.
Arrange that radial coil realizes that there is following shortcoming in the scheme of audio signal transmission:
1, must dispose a high power low frequency amplifier and go to promote radial coil, simultaneously an induction coil need be set, the electromagnetic wave of radial coil radiation is reduced to audio signal at receiving terminal.
2, the indoor radial coil of arranging all around is very inconvenient.
3, need to use high power low frequency amplifier, cost height.
4, poor mobility.
Task of the present utility model is to provide a kind of simple in structure, cheap infrared audio signal transmitter.
The drawing explanation:
Fig. 1 is infrared audio signal transmitter circuitry figure.BG-triode among the figure, D
1-infraluminescence pipe, D
2, D
3, D
4, D
5-rectifier diode, B-power transformer, R
1, R
2, R
3-resistance, C
1, C
2, C
3, C
4-electric capacity, A
1, A
2-plug.
Describe the design's particular content in detail below in conjunction with accompanying drawing: as shown in Figure 1, this infrared acoustic frequency signal sending machme circuit contains a fairing, a filter, an isolated amplifier that is used for audio signal modulation. Fairing be one by commutation diode D2～D
5The rectification bridge circuit that forms, two arms in this bridge circuit are connected with the pair end of power transformer (B), apply voltage to be～6V. Filter be one by resistance (R3), electric capacity (C3〕、〔C
4) the π type filter circuit that consists of. Isolated amplifier is by triode (BG), infraluminescence pipe (D1), resistance (R1〕、〔R
2), electric capacity (C2) consist of. A1Electric capacity (C of end serial connection1), be used for isolation from the direct current composition of the audio signal of television set. A1、A
2End consists of plug, inserts in the tv audio output plughole, with this infrared acoustic frequency signal sending machme of audio signal feed-in circuit of television set. The circuit board of arranging this circuit is installed in the casing made from common plastics.
This transmitter circuitry operation principle is: power transformer (B) provides 6V alternating current for the rectification bridge circuit, provides level and smooth direct current for isolated amplifier after the rectification of process rectification bridge circuit and the filtering of π type filter circuit.Isolated amplifier is isolated amplification to the audio signal from television set, and audio signal is modulated the emitter current of triode (BG) in linear modulator zone, makes the infraluminescence pipe (D that is serially connected on triode (BG) emitter
1) electric current produce respective change, infraluminescence pipe (D
1) infrared light brightness also change thereupon, thereby realize the infrared radiation of audio signal.
Utilize infrared audio signal transmitter that the design's circuit makes relatively, have the following advantages with existing audio signal transmitter:
1, structure is the simplest;
2, cheap, only be existing below 10% of transmitter;
3, similar transmitter not being produced any signal disturbs.And existing transmitter all has interference in various degree.
4, volume is little, and mobility is good.
Embodiment:
Use circuit as shown in Figure 1, make EFFECTIVE RANGE and be not less than 20 meters infrared audio signal transmitter, adopt following components and parts just can realize.
BG-3DG12, D
1-GL5 infraluminescence pipe, D
2～D
5-2CZ(10V, 200mA), R
1-10K Ω, R
2, R
3-100 Ω, C
1-100 μ f/6V, C
2-100Pf, C
3-220 μ f/10V, C
4-100 μ f/10V.
By A
1End and A
2The plug that end is formed inserts the tv audio output plughole, infraluminescence pipe (D
1) the generation infrared radiation.Use Infrared wireless earphone and in 20 meters scopes of this transmitter, receiving television field frame.
Claims (2)
1, a kind of infrared audio signal transmitter that is made of circuit and casing is characterized in that the circuit of this transmitter contains a rectification bridge circuit, and one by resistance [R
3] and electric capacity [C
3], [C
4] the π type filter that constitutes, an isolated amplifier that is used for audio signal modulation, a power transformer [B] provide 6V alternating current for the rectification bridge circuit, after rectification bridge path rectification and the filtering of π type filter, for isolated amplifier provides level and smooth direct current, audio signal is by [A
1] end and [A
2] the plug feed-in isolated amplifier formed of end, infraluminescence pipe [D
1] produce the infrared radiation of audio signal.
2,, it is characterized in that described isolated amplifier is by triode (BG), infraluminescence pipe (D according to the described transmitter of claim 1
1) and resistance (R
1), (R
2) and electric capacity (C
2) form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87216712 CN87216712U (en) | 1987-12-19 | 1987-12-19 | Infrared acoustic frequency signal sending machme |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87216712 CN87216712U (en) | 1987-12-19 | 1987-12-19 | Infrared acoustic frequency signal sending machme |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87216712U true CN87216712U (en) | 1988-12-21 |
Family
ID=4830606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87216712 Pending CN87216712U (en) | 1987-12-19 | 1987-12-19 | Infrared acoustic frequency signal sending machme |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87216712U (en) |
-
1987
- 1987-12-19 CN CN 87216712 patent/CN87216712U/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C20 | Patent right or utility model deemed to be abandoned or is abandoned | ||
| WD01 | Invention patent application deemed withdrawn after publication |