CN2100064U - Passive fm/am tv musical accompany translator - Google Patents
Passive fm/am tv musical accompany translator Download PDFInfo
- Publication number
- CN2100064U CN2100064U CN 91209382 CN91209382U CN2100064U CN 2100064 U CN2100064 U CN 2100064U CN 91209382 CN91209382 CN 91209382 CN 91209382 U CN91209382 U CN 91209382U CN 2100064 U CN2100064 U CN 2100064U
- Authority
- CN
- China
- Prior art keywords
- field frame
- signal
- modulation
- television field
- television
- 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.)
- Withdrawn
Links
Images
Landscapes
- Details Of Television Systems (AREA)
Abstract
A passive FM/AM TV accompanying sound transmitting device belongs to a small-size radio transmitting device. The utility model is composed of a purpose-made modulation transformer and a multi-vibrator. Accompanying sound signals of TV are divided into two channels. One channel serves as power supply of the machine after voltage commutation filtering. The other channel is inputted into the multi-vibrator for frequency mixing and modulation. Frequency and amplitude modulation signals are transmitted by antennas then. Transmitting distance is more than 8 meters. Radio earphones and common radios can be used for listening. The utility model has small volume and no special power supply, and is a good TV accompanying sound transmitting device for electrified education and households.
Description
The utility model belongs to the compact radio emitter.
The television field frame transponder of present plant produced and market sale, majority is the frequency modulation transponder.It needs the dry cell of number joint 1.5V to make the work power supply, and volume is big, the cost height, and the general semiconductor broadcast receiver can't be listened to, and only is applicable to fm-tv sound accompaniment wireless headset, is applied to television teaching system, and the scope of application is narrow.And its operating distance of amplitude modulation transponder has only about 2 meters, more difficult promoting the use of.
The purpose of this utility model is to adopt a kind of special modulation transformer and a multivibrator, do not need special power supply, and can transfer the Frequency And Amplitude Modulation signal, and fm-tv sound accompaniment wireless headset is received, ordinary amplitude modulation companion conductor broadcast receiver is received.
For this reason, ad hocly counted a kind of special modulation transformer B, after its an elementary end boosts the sound accompaniment of television set for fast number, through capacitor C
1Lotus root is closed, diode D
1, D
2, resistance R
2, capacitor C
2, C
3, the power supply that a direct current voltage is made this machine is obtained in filtering to the public domain voltage multiplying rectifier, fast number of the sound accompaniment of secondary still exportable television set.With one by triode T
1, T
2, resistance R
3, R
4, capacitor C
6, C
7, C
5The multivibrator of forming with inductance L, the local frequency that produces by its and after the sound accompaniment fast mixing of the television set of the secondary output of modulation transformer, launch frequency modulation through antenna TX again, fast number of amplitude modulation is the sound accompaniment that available receiver receives television set in 8-10 rice.
Embodiment of the present utility model is as shown in drawings: CZ is the 3.5mm plug, directly insert television audio, the earphone jack of output, television field frame enters the modulation transformer of this machine through the CZ plug elementary winding is divided into two-way, after the one tunnel elementary winding one end self coupling at modulation transformer boosts, through capacitor C
1, to this machine public domain, by diode D
1, D
2, capacitor C
1, C
2, resistance R
2Carry out voltage multiplying rectifier filtering and obtain a direct current voltage, as localpower.Through the secondary winding of special modulation transformer, deliver on the inductance L, for multivibrator provides supply voltage, another road television field frame signal is coupled to secondary through modulation transformer, also deliver to the multivibrator mixed modulated through inductance L again.Multivibrator is by two triode T
1, T
2, resistance R
3, R
4, capacitor C
6, C
7Form, the television field frame signal is after the high frequency mixed modulated that multivibrator produces, through capacitor C
8Be coupled to antenna TX and launch high frequency Frequency And Amplitude Modulation signal.Reduce inductance L, capacitor C
6, C
7, can change tranmitting frequency, the carrier frequency of the frequency modulation signal of emission is changed in the 88-108MHZ scope, transmitting range can receive with the television field frame wireless headset greater than 10 meters.Increase inductance L, capacitor C
6, C
7, promptly reduce tranmitting frequency, the carrier frequency of the amplitude modulation signal of emission is changed in the 525-1605KHZ scope.Transmitting range is greater than 8 meters, and available general semiconductor broadcast receiver receives.Capacitor C
4For the tonequality of improving the emission signal is provided with capacitor C
5Be trimmer, resistance R
1Be impedance matching resistance, complete machine input impedance is greater than 8 Ω.
The utility model has adopted special modulation transformer, do not need to supply with specially the DC power supply of this machine, this body is long-pending little by (70 * 52 * 22mm), cost is low, and can launch Frequency And Amplitude Modulation television field frame signal, wide application, both available television sound accompaniment wireless headset received, and also available general semiconductor broadcast receiver receives.It is that audio-visual education programme and family transmit comparatively ideal transponder as television field frame.
Claims (3)
1, a kind of sound accompaniment signal with television set is transmitted into aerial passive FM/AM television field frame transponder again through the local oscillator mixed modulated, it is characterized in that it has a sound accompaniment signal with television set to be divided into two the tunnel, one road self coupling output voltage multiplying rectifier is made power supply, the modulation transformer B of the secondary output television field frame of another route signal and a multivibrator with television field frame signal and local oscillator mixed modulated.
2, television field frame transponder according to claim 1, an elementary end self coupling that it is characterized in that its modulation transformer B boost the television field frame signal of output through capacitor C
1Coupling, diode D
1, D
2, resistance R
2, capacitor C
2, C
3, to making localpower after the filtering of public domain voltage multiplying rectifier, the secondary output television field frame signal of modulation transformer is delivered to multivibrator.
3, television field frame transponder according to claim 1 is characterized in that triode T
1, T
2, resistance R
3, R
4, capacitor C
6, C
7, C
5Forming one with inductance L can make the carrier frequency of the frequency modulation signal of emission change the multivibrator that the carrier frequency that the amplitude modulation of emission is fast number changes in the 88-108MHZ scope in the 525-1605KHZ scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91209382 CN2100064U (en) | 1991-06-05 | 1991-06-05 | Passive fm/am tv musical accompany translator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91209382 CN2100064U (en) | 1991-06-05 | 1991-06-05 | Passive fm/am tv musical accompany translator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2100064U true CN2100064U (en) | 1992-03-25 |
Family
ID=4918366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91209382 Withdrawn CN2100064U (en) | 1991-06-05 | 1991-06-05 | Passive fm/am tv musical accompany translator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2100064U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106896458A (en) * | 2017-03-08 | 2017-06-27 | 深圳市晓控通信科技有限公司 | A kind of optical cable branch box of use telecommunication technique |
-
1991
- 1991-06-05 CN CN 91209382 patent/CN2100064U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106896458A (en) * | 2017-03-08 | 2017-06-27 | 深圳市晓控通信科技有限公司 | A kind of optical cable branch box of use telecommunication technique |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB1487404A (en) | Data communication system | |
| CN105813183A (en) | Wireless communication system with energy transmission | |
| CN201608898U (en) | Microphone wireless sound transmission system | |
| CN2100064U (en) | Passive fm/am tv musical accompany translator | |
| CN211403420U (en) | Wireless screen transmission device | |
| CN206004650U (en) | A kind of phaselocked loop frequency modulation broadcasting emitter | |
| CN2418633Y (en) | Television sound-accompaniment far-transmission machine | |
| CN205356537U (en) | Public television audio and automatic switch machine | |
| CN2248426Y (en) | Micro-wireless earphone | |
| CN2208299Y (en) | Wireless earphone of TV set | |
| CN211557253U (en) | Audio wireless transmitting device | |
| CN2250615Y (en) | infrared wireless loudspeaker box | |
| CN220067416U (en) | FM stereo receiving and transmitting circuit and receiving and transmitting device | |
| CN2159084Y (en) | Television audio-frequency infrared transmitting and receiving device | |
| CN201726359U (en) | Digital signal amplitude modulating circuit | |
| CN2055654U (en) | Delivering equipment for radio earphone | |
| CN201290121Y (en) | Satellite digital broadcast receiver with words information broadcast receiving function | |
| CN2118370U (en) | Household totipotent wireless transmitter | |
| CN2129497Y (en) | Pocket recording-reproducing machine phone transmitter | |
| CN2079836U (en) | Intercom with radio | |
| CN2336482Y (en) | All-channel TV receiving antenna | |
| CN2301818Y (en) | 550 MHZ cable TV channel adding device | |
| CN2788478Y (en) | Remote-control type audio/video frequency information transferring device | |
| CN2110321U (en) | Infrared frequency modulation wireless earphone | |
| CN2150688Y (en) | Sound accompaniment infra-red tele-listening device for television |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| 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 |