CN2418633Y - Television sound-accompaniment far-transmission machine - Google Patents
Television sound-accompaniment far-transmission machine Download PDFInfo
- Publication number
- CN2418633Y CN2418633Y CN00214483U CN00214483U CN2418633Y CN 2418633 Y CN2418633 Y CN 2418633Y CN 00214483 U CN00214483 U CN 00214483U CN 00214483 U CN00214483 U CN 00214483U CN 2418633 Y CN2418633 Y CN 2418633Y
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- China
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- master oscillator
- frequency
- voltage divider
- transmission machine
- field frame
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Abstract
The utility model relates to a transmitter which transmits television sound signal in a radio frequency modulation mode, comprising a master oscillator, a frequency modulator, wherein, the frequency modulator is connected with the master oscillator which is a three-point oscillator; the frequency modulator comprises a varactor diode and a resistance voltage divider, an input end of the resistance voltage divider is connected with a television sound output interface, and an output end is connected with the varactor diode; a resistor of the resistance voltage divider is a variable resistor, and the variable resistor and a variable capacitor which is arranged in a main oscillating loop of the master oscillator are arranged on the same frequency selecting axis. The utility model is matched with domestic FM radio sets or analogical receiving equipment, and can solve the contradiction of watching TV, learning, and rest among family members. The utility model has the advantages of small size and low cost.
Description
The utility model relates to the transmitter that a kind of mode with wireless frequency modulation transmits television audio signals.
Because people are when seeing TV, leave the television set certain distance, thereby the contradiction below just producing: loud, can influence study and the rest of other members in the family, sound is little, dulect music effect performance is not come out, and particularly to the elderly of some hearing loss or the crowd a little less than the hearing, sound is little can not heard or can't hear.See that in order to solve the kinsfolk TV influences the contradiction that other people learn, have a rest, the producer that has has released the emitter with far infrared teletransmission television field frame, and each this emitter is only joined an infrared ray and received earphone.The deficiency of this emitter is that infrared ray reception earphone only is furnished with one, can only listen usefulness for a people, can not satisfy the above usefulness of listening of two people, this is an one, two of deficiency is that the transmitter volume is big, price is high, can not receives with FM receiver in the family or similar receiving equipment, and versatility is poor.
The purpose of this utility model provides a kind of television field frame far-transmission machine that can listen to television field frame with FM receiver or similar receiving equipment.
This television field frame far-transmission machine, comprise frequency of oscillation energy continuously adjustable master oscillator and the frequency modulator that is connected with master oscillator, master oscillator is a capacitance connecting three point type oscillator, frequency modulator comprises the resitstance voltage divider that the variable capacitance diode that is connected with the oscillating tube of master oscillator and output are connected with this variable capacitance diode, a resistance in the resitstance voltage divider is variable resistor, the variable capacitance that the master of this variable resistor and master oscillator shakes in the loop is contained on the same frequency-selecting axle, and the input of resitstance voltage divider is connected with the sound accompaniment output interface of television set.
The frequency of oscillation adjustable extent of above-mentioned master oscillator is 64-108MHZ, and the power supply of television field frame far-transmission machine described in the utility model is the battery direct voltage of 3V or the 5V voltage that electric main is exported after step-down, rectification, filtering and voltage stabilizing.
FM receiver in this television field frame far-transmission machine and the family or the similarly supporting use of receiving equipment.During installation, with cable the input of resitstance voltage divider described in the utility model and the sound accompaniment output interface of television set are linked together earlier.During use, earlier FM receiver or similar receiving equipment are placed on the kinsfolk next door of seeing TV programme, energized, and the volume of television field frame turned down, again above-mentioned receiving equipment is transferred to a certain frequency place of no any FM broadcasting, rotate this reality at last and make turn-knob on the novel described frequency-selecting axle, promptly change the centre frequency of master oscillator, it is identical to make it the receive frequency set up with above-mentioned receiving equipment, because master oscillator is that audio frequency by television field frame carries out the frequency-modulated wave that frequency modulation forms through frequency modulator to the centre frequency that master oscillator produces to the signal frequency of spatial emission, utilize existing FM receiver in the family or the similar frequency discriminator in the receiving equipment again, television audio signals is separated from frequency-modulated wave, and amplified, thereby can be from FM receiver or similar receiving equipment uppick television field frame.
From the above mentioned, use this television field frame far-transmission machine, not only can realize utilizing in the family existing FM receiver or similarly receiving equipment listen to television field frame, solve the contradiction of seeing TV and study, rest among the kinsfolk, and can many people listen to sound accompaniment, applicability is strong.This television field frame far-transmission machine, the variable resistor of resitstance voltage divider is coaxial the connection in variable capacitance because the master of master oscillator shakes in the loop and the frequency modulator, rotate the frequency modulation axle, variable capacitance and its capacitance of variable resistor synchronous change and resistance value, when the frequency of oscillation that makes master oscillator changes in the 64-108MHZ scope continuously, guarantee the frequency deviation of maximum frequency modulation≤± 75KMZ, this part is skillfully constructed, simplified circuit structure, thereby with compare with the emitter of far infrared teletransmission television field frame, it is little to have volume, the characteristics that cost is low, cost are the 1/10-1/15 of the emitter of far infrared teletransmission television field frame.
Accompanying drawing shows the embodiment of this television field frame far-transmission machine, and wherein Fig. 1 is the circuit structure schematic diagram of the battery powered television field frame far-transmission machine of 3V, and Fig. 2 is the power circuit principle figure of mains-supplied.
In the present embodiment, the television field frame far-transmission machine comprise frequency of oscillation can be in the 64-108MHZ scope continuously adjustable master oscillator 1 and the frequency modulator 2 that is connected with master oscillator 1, master oscillator 1 is a capacitance connecting three point type oscillator, by triode T, capacitor C 1, C2, C3, C4, C5, resistance R 1, R2 and inductance L 1 constitute, the wherein main loop C2 that shakes, L1 is connected in parallel on the collector electrode of T, L1 double as transmitting antenna, R3, C5 is connected in parallel on the emitter of T, C4 is connected between the collector electrode and emitter of T, R2, C3 is connected in parallel between the common port of the base stage of T and master oscillator 1, R1 is connected between the base stage and power end of T, C1 is connected between the common port of power end and master oscillator 1, frequency modulator 2 comprises variable capacitance diode CD and resitstance voltage divider R4, R5, R6, the end of variable capacitance diode CD is connected with the collector electrode of T by coupling capacitance C6, the common port of another termination master oscillator 1, CD connects the end of C6 by inductance L 3 and resitstance voltage divider R4, R5, the output M of R6 connects, resitstance voltage divider R4, R5, resistance R 5 among the R6 is a variable resistor, this variable resistor and variable capacitance C2 are contained on the same frequency-selecting axle, resitstance voltage divider R4, R5, two input X of R6, Y is connected with the sound accompaniment output interface of television set 3, wherein the X end is connected with the power end of master oscillator 1 by inductance L 2, the power supply of present embodiment is the battery direct voltage of 3V, also can use the civil power of alternating current 220V through step-down, rectification, the 5V power voltage supply of exporting after filtering and the voltage stabilizing, step-down transformer B step-down, the bridge rectifier D rectification, filter capacitor C10, C11 filtering, three terminal regulator Tw voltage stabilizing is a known technology, will not carefully state.
Claims (3)
1, a kind of television field frame far-transmission machine, it is characterized in that comprising frequency of oscillation continuously adjustable master oscillator of energy (1) and the frequency modulator (2) that is connected with master oscillator (1), master oscillator (1) is a capacitance connecting three point type oscillator, frequency modulator (2) comprises the resitstance voltage divider (R4 that the variable capacitance diode (CD) that is connected with the oscillating tube of master oscillator (1) and output (M) are connected with this variable capacitance diode (CD), R5, R6), resitstance voltage divider (R4, R5, R6) resistance (R5) in is variable resistor, the master of this variable resistor and master oscillator (1) loop (C2 that shakes, L1) variable capacitance in (C2) is contained on the same frequency-selecting axle, resitstance voltage divider (R4, R5, R6) input (X, Y) the sound accompaniment output interface with television set (3) is connected.
2, television field frame far-transmission machine according to claim 1, the frequency of oscillation adjustable extent that it is characterized in that master oscillator (1) is 64-108MHZ.
3, television field frame far-transmission machine according to claim 1 is characterized in that power supply is the battery direct voltage of 3V or the 5V voltage that electric main is exported after step-down, rectification, filtering and voltage stabilizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00214483U CN2418633Y (en) | 2000-04-30 | 2000-04-30 | Television sound-accompaniment far-transmission machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00214483U CN2418633Y (en) | 2000-04-30 | 2000-04-30 | Television sound-accompaniment far-transmission machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2418633Y true CN2418633Y (en) | 2001-02-07 |
Family
ID=33580580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00214483U Expired - Fee Related CN2418633Y (en) | 2000-04-30 | 2000-04-30 | Television sound-accompaniment far-transmission machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2418633Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111756332A (en) * | 2020-07-23 | 2020-10-09 | 成都世源频控技术股份有限公司 | Low-noise crystal oscillator based on multiple resonators and implementation method thereof |
-
2000
- 2000-04-30 CN CN00214483U patent/CN2418633Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111756332A (en) * | 2020-07-23 | 2020-10-09 | 成都世源频控技术股份有限公司 | Low-noise crystal oscillator based on multiple resonators and implementation method thereof |
| CN111756332B (en) * | 2020-07-23 | 2021-07-20 | 成都世源频控技术股份有限公司 | Low-noise crystal oscillator based on multiple resonators and implementation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |