CN211403420U - Wireless screen transmission device - Google Patents
Wireless screen transmission device Download PDFInfo
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- CN211403420U CN211403420U CN201921603180.7U CN201921603180U CN211403420U CN 211403420 U CN211403420 U CN 211403420U CN 201921603180 U CN201921603180 U CN 201921603180U CN 211403420 U CN211403420 U CN 211403420U
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Abstract
The utility model relates to a wireless screen transmitter, which comprises an audio modulation circuit and a video carrier frequency generation circuit; the audio modulation circuit modulates the input audio signal into an audio signal of 6.5MHz, and the video carrier frequency generation circuit generates a video carrier frequency signal of 38.625 MHz; the audio signal of 6.5MHz is modulated into an audio signal of 83.75MHz and the video carrier frequency signal of 38.625MHz is modulated into a video carrier frequency signal of 77.25MHz through an audio and video mixed transmitting circuit, and then the audio and video mixed transmitting circuit further mixes the audio signal of 83.75MHz, the video carrier frequency signal of 77.25MHz and the input video signal to form an audio and video signal which is transmitted to the air and received by an antenna of a television; the wireless screen transmission is realized, the circuit is simple, the cost is low, the size is small, and the practicability is wide.
Description
Technical Field
The utility model relates to a wireless biography screen technical field, more specifically say, relate to a wireless biography screen ware.
Background
With the continuous improvement of the living standard of people, the demand of people on wireless screen transmission is more and more increased; wireless screen transmission, namely converting wired audio and video signals into radio frequency signals for transmission, and receiving the radio frequency signals by an antenna of a television to realize wireless screen transmission; most of the existing wireless screen transmission devices are complex in circuit structure, high in cost and large in size, and cannot meet the use requirements of people.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, it is simple to provide a circuit, and is with low costs, small wireless biography screen ware.
The utility model provides a technical scheme that its technical problem adopted is:
constructing a wireless screen transmitter, which comprises an audio modulation circuit and a video carrier frequency generation circuit; the audio modulation circuit is used for modulating an input audio signal into an audio signal of 6.5MHz, and the video carrier frequency generation circuit is used for generating a video carrier frequency signal of 38.625 MHz; the audio modulation circuit and the video carrier frequency generation circuit are connected with an audio and video mixed transmitting circuit, the audio and video mixed transmitting circuit is used for modulating the 6.5MHz audio signal into an 83.75MHz audio signal and modulating the 38.625MHz video carrier frequency signal into a 77.25MHz video carrier frequency signal, and the audio and video mixed transmitting circuit is further used for mixing the 83.75MHz audio signal, the 77.25MHz video carrier frequency signal and an input video signal to form an audio and video signal and transmitting the audio and video signal to the air.
The utility model discloses a wireless pass screen ware, wherein, audio frequency modulation circuit includes first triode and middle week transformer; the base electrode of the first triode is connected with a first capacitor, and the other end of the first capacitor is the input end of the audio signal; the base electrode of the first triode is also linked with a first resistor, a second resistor and a second capacitor, the other end of the first resistor is connected with the anode of a power supply, and the other ends of the second resistor and the second capacitor are both grounded; a collector of the first triode is connected with a pin 2 of the middle-period transformer, a pin 1 of the middle-period transformer is connected with the positive electrode of the power supply, a pin 1 and a pin 2 of the middle-period transformer are connected in parallel with a third capacitor, and a collector and an emitter of the first triode are connected in parallel with a fourth capacitor; the emitter of the first triode is also connected with a fifth capacitor and a third resistor, and the other ends of the fifth capacitor and the third resistor are grounded; and 4 pins of the middle transformer are grounded, and 3 pins of the middle transformer are connected with the audio and video hybrid transmitting circuit.
The utility model discloses a wireless pass screen ware, wherein, video carrier frequency generating circuit includes second triode, non-polar electric capacity, sixth electric capacity, seventh electric capacity and eighth electric capacity and first inductance; the non-polar capacitor and the first inductor are both connected with the positive electrode of the power supply, and the other ends of the non-polar capacitor and the first inductor are both connected with the collector electrode of the second triode; the sixth capacitor is connected with the base electrode of the second triode, and the other end of the sixth capacitor is grounded; a base electrode of the second triode is connected with a fourth resistor and a fifth resistor, the other end of the fourth resistor is connected with the anode of the power supply, and the other end of the fifth resistor is grounded; the seventh capacitor is connected with the collector and the emitter of the second triode in parallel; the eighth capacitor is connected with the emitter of the second triode, and the other end of the eighth capacitor is grounded; the emitter of the second triode is also connected with a sixth resistor, and the other end of the sixth resistor is grounded; and the collector of the second triode is connected with the audio and video mixed emission circuit.
The utility model discloses a wireless pass screen ware, wherein, audio frequency and video mixed transmitting circuit includes third triode, ninth electric capacity, tenth electric capacity, eleventh electric capacity and twelfth electric capacity and three-pin inductance; the ninth capacitor and the tenth capacitor are both connected with the base electrode of the third triode, the other end of the ninth capacitor is connected with the collector electrode of the second triode, and the other end of the tenth capacitor is connected with the pin 3 of the middle transformer; the base electrode of the third triode is also connected with a seventh resistor and an eighth resistor, the other end of the seventh resistor is connected with the anode of the power supply, and the other end of the eighth resistor is grounded; the eleventh capacitor is connected with the positive electrode of the power supply, the other end of the eleventh capacitor is connected with the collector electrode of the third triode, pin 1 of the three-pin inductor is connected with the positive electrode of the power supply, pin 3 of the three-pin inductor is connected with the collector electrode of the third triode, pin 2 of the three-pin inductor is connected with the twelfth capacitor, and the other end of the twelfth capacitor is the transmitting end of the audio and video signals of the audio and video mixed transmitting circuit; and the emitter of the third triode is also connected with a thirteenth capacitor, and the other end of the thirteenth capacitor is grounded.
Wireless pass screen ware, wherein, the projecting pole of third triode still is connected with adjustable resistance, 2 pins of adjustable resistance with the projecting pole of third triode is connected, 1 pin ground connection of adjustable resistance, 3 pins of adjustable resistance are connected with fourteenth electric capacity and fifteenth electric capacity, the other end ground connection of fourteenth electric capacity, the other end of fifteenth electric capacity does video signal's input.
The beneficial effects of the utility model reside in that: the audio modulation circuit modulates the input audio signal into an audio signal of 6.5MHz, and the video carrier frequency generation circuit generates a video carrier frequency signal of 38.625 MHz; the audio signal of 6.5MHz is modulated into an audio signal of 83.75MHz and the video carrier frequency signal of 38.625MHz is modulated into a video carrier frequency signal of 77.25MHz through an audio and video mixed transmitting circuit, and then the audio and video mixed transmitting circuit further mixes the audio signal of 83.75MHz, the video carrier frequency signal of 77.25MHz and the input video signal to form an audio and video signal which is transmitted to the air and received by an antenna of a television; the wireless screen transmission is realized, the circuit is simple, the cost is low, the size is small, and the practicability is wide.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work according to the drawings:
fig. 1 is a schematic circuit diagram of a wireless screen transmitter according to a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, a clear and complete description will be given below with reference to the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
The wireless screen transmitter of the preferred embodiment of the present invention is shown in fig. 1; comprises an audio modulation circuit 100 and a video carrier frequency generation circuit 200; the audio modulation circuit 100 is used for modulating an input audio signal into an audio signal of 6.5MHz, and the video carrier frequency generation circuit 200 is used for generating a video carrier frequency signal of 38.625 MHz; the audio modulation circuit 100 and the video carrier frequency generation circuit 200 are connected with an audio and video mixed transmitting circuit 300, the audio and video mixed transmitting circuit 300 is used for modulating an audio signal of 6.5MHz into an audio signal of 83.75MHz and modulating a video carrier frequency signal of 38.625MHz into a video carrier frequency signal of 77.25MHz, and the audio and video mixed transmitting circuit 300 is also used for mixing the audio signal of 83.75MHz, the video carrier frequency signal of 77.25MHz and an input video signal to form an audio and video signal and transmitting the audio and video signal to the air;
the audio modulation circuit 100 modulates the input audio signal into an audio signal of 6.5MHz, and the video carrier frequency generation circuit 200 generates a video carrier frequency signal of 38.625 MHz; the audio-video mixed transmitting circuit 300 modulates the 6.5MHz audio signal into 83.75MHz audio signal and modulates the 38.625MHz video carrier frequency signal into 77.25MHz video carrier frequency signal, then the audio-video mixed transmitting circuit 300 mixes the 83.75MHz audio signal, the 77.25MHz video carrier frequency signal and the input video signal to form audio-video signal, and transmits the audio-video signal to the air for the antenna of the television to receive; the wireless screen transmission is realized, the circuit is simple, the cost is low, the size is small, the practicability is wide, wherein, the 83.75MHz audio signal and the 77.25MHz video carrier frequency signal just fall into the 4 channels of the television specified by the national standard, and the transmitted audio and video can be watched by adjusting the frequency of the television to 4.
As shown in fig. 1, the audio modulation circuit 100 includes a first transistor Q3 and a middle transformer B1; the base electrode of the first triode Q3 is connected with a first capacitor C10, and the other end of the first capacitor C10 is the input end of an audio signal; the base of the first triode Q3 is also linked with a first resistor R6, a second resistor R7 and a second capacitor C11, the other end of the first resistor R6 is connected with the anode of a power supply, and the other ends of the second resistor R7 and the second capacitor C11 are both grounded; a collector of the first triode Q3 is connected with a pin 2 of a middle-period transformer B1, a pin 1 of a middle-period transformer B1 is connected with the positive electrode of a power supply, a pin 1 and a pin 2 of the middle-period transformer B1 are connected in parallel with a third capacitor C12, and a collector and an emitter of the first triode Q3 are connected in parallel with a fourth capacitor C14; the emitter of the first triode Q3 is also connected with a fifth capacitor C13 and a third resistor R8, and the other ends of the fifth capacitor C13 and the third resistor R8 are both grounded; the pin 4 of the middle transformer B1 is grounded and the pin 3 is connected with the audio and video mixed transmitting circuit 300; if the accompanying sound (audio) is not clear, the magnetic core of the middle transformer B1 can be adjusted to change the audio quality.
As shown in fig. 1, the video carrier frequency generating circuit 200 includes a second transistor Q1, a non-polar capacitor C2, a sixth capacitor C1, a seventh capacitor C4, an eighth capacitor C3, and a first inductor L1; the non-polar capacitor C2 and the first inductor L1 are both connected with the positive electrode of the power supply, and the other ends of the non-polar capacitor C2 and the first inductor L1 are both connected with the collector electrode of the second triode Q1; the sixth capacitor C1 is connected with the base of the second triode Q1, and the other end of the sixth capacitor C1 is grounded; the base electrode of the second triode Q1 is connected with a fourth resistor R1 and a fifth resistor R2, the other end of the fourth resistor R1 is connected with the positive electrode of the power supply, and the other end of the fifth resistor R2 is grounded; the seventh capacitor C4 is connected in parallel with the collector and the emitter of the second triode Q1; the eighth capacitor C3 is connected with the emitter of the second triode Q1, and the other end of the eighth capacitor C3 is grounded; the emitter of the second triode Q1 is also connected with a sixth resistor R3, and the other end of the sixth resistor R3 is grounded; the collector of the second triode Q1 is connected with the audio and video mixed emission circuit 300; the second transistor Q1, the non-polar capacitor C2, the sixth capacitor C1, the seventh capacitor C4, the eighth capacitor C3 and the first inductor L1 form a modified parallel capacitor three-point oscillator (i.e., a tin pull oscillator) to generate a video carrier signal.
As shown in fig. 1, the audio/video hybrid transmitting circuit 300 includes a third transistor Q2, a ninth capacitor C5, a tenth capacitor C6, an eleventh capacitor C8, a twelfth capacitor C9, and a three-pin inductor L2; a ninth capacitor C5 and a tenth capacitor C6 are both connected with the base of the third triode Q2, the other end of the ninth capacitor C5 is connected with the collector of the second triode Q1, and the other end of the tenth capacitor C6 is connected with the 3-pin of the middle-period transformer B1; the base electrode of the third triode Q2 is also connected with a seventh resistor R4 and an eighth resistor R5, the other end of the seventh resistor R4 is connected with the positive electrode of the power supply, and the other end of the eighth resistor R5 is grounded; the eleventh capacitor C8 is connected with the positive electrode of the power supply, the other end of the eleventh capacitor C8 is connected with the collector of the third triode Q2, pin 1 of the three-pin inductor L2 is connected with the positive electrode of the power supply, pin 3 of the three-pin inductor L2 is connected with the collector of the third triode Q2, pin 2 of the three-pin inductor L2 is connected with the twelfth capacitor C9, and the other end of the twelfth capacitor C9 is the transmitting end of the audio/video signal of the audio/video hybrid transmitting circuit 300; the emitter of the third triode Q2 is also connected with a thirteenth capacitor C7, and the other end of the thirteenth capacitor C7 is grounded; the circuit is simple, the cost is low, and the volume is small.
As shown in fig. 1, an emitter of the third transistor Q2 is further connected to an adjustable resistor VR1, a pin 2 of the adjustable resistor VR1 is connected to an emitter of the third transistor Q2, a pin 1 of the adjustable resistor VR1 is grounded, a pin 3 of the adjustable resistor VR1 is connected to a fourteenth capacitor C15 and a fifteenth capacitor C16, the other end of the fourteenth capacitor C15 is grounded, and the other end of the fifteenth capacitor C16 is an input end of a video signal; wherein the image quality can be changed by adjusting the adjustable resistor VR 1.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (5)
1. A wireless screen transmitter comprises an audio modulation circuit and a video carrier frequency generation circuit; the audio frequency modulation circuit is used for modulating an input audio signal into an audio signal of 6.5MHz, and the video carrier frequency generation circuit is used for generating a video carrier frequency signal of 38.625 MHz; the audio modulation circuit and the video carrier frequency generation circuit are connected with an audio and video mixed transmitting circuit, the audio and video mixed transmitting circuit is used for modulating the 6.5MHz audio signal into an 83.75MHz audio signal and modulating the 38.625MHz video carrier frequency signal into a 77.25MHz video carrier frequency signal, and the audio and video mixed transmitting circuit is further used for mixing the 83.75MHz audio signal, the 77.25MHz video carrier frequency signal and an input video signal to form an audio and video signal and transmitting the audio and video signal to the air.
2. The wireless screen reader of claim 1, wherein the audio modulation circuit comprises a first triode and a mid-cycle transformer; the base electrode of the first triode is connected with a first capacitor, and the other end of the first capacitor is the input end of the audio signal; the base electrode of the first triode is also linked with a first resistor, a second resistor and a second capacitor, the other end of the first resistor is connected with the anode of a power supply, and the other ends of the second resistor and the second capacitor are both grounded; a collector of the first triode is connected with a pin 2 of the middle-period transformer, a pin 1 of the middle-period transformer is connected with the positive electrode of the power supply, a pin 1 and a pin 2 of the middle-period transformer are connected in parallel with a third capacitor, and a collector and an emitter of the first triode are connected in parallel with a fourth capacitor; the emitter of the first triode is also connected with a fifth capacitor and a third resistor, and the other ends of the fifth capacitor and the third resistor are grounded; and 4 pins of the middle transformer are grounded, and 3 pins of the middle transformer are connected with the audio and video hybrid transmitting circuit.
3. The wireless screen transmitter according to claim 2, wherein the video carrier frequency generating circuit comprises a second triode, a non-polar capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor and a first inductor; the non-polar capacitor and the first inductor are both connected with the positive electrode of the power supply, and the other ends of the non-polar capacitor and the first inductor are both connected with the collector electrode of the second triode; the sixth capacitor is connected with the base electrode of the second triode, and the other end of the sixth capacitor is grounded; a base electrode of the second triode is connected with a fourth resistor and a fifth resistor, the other end of the fourth resistor is connected with the anode of the power supply, and the other end of the fifth resistor is grounded; the seventh capacitor is connected with the collector and the emitter of the second triode in parallel; the eighth capacitor is connected with the emitter of the second triode, and the other end of the eighth capacitor is grounded; the emitter of the second triode is also connected with a sixth resistor, and the other end of the sixth resistor is grounded; and the collector of the second triode is connected with the audio and video mixed emission circuit.
4. The wireless screen transmitter according to claim 3, wherein the audio/video hybrid transmitting circuit comprises a third triode, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor and a three-pin inductor; the ninth capacitor and the tenth capacitor are both connected with the base electrode of the third triode, the other end of the ninth capacitor is connected with the collector electrode of the second triode, and the other end of the tenth capacitor is connected with the pin 3 of the middle transformer; the base electrode of the third triode is also connected with a seventh resistor and an eighth resistor, the other end of the seventh resistor is connected with the anode of the power supply, and the other end of the eighth resistor is grounded; the eleventh capacitor is connected with the positive electrode of the power supply, the other end of the eleventh capacitor is connected with the collector electrode of the third triode, pin 1 of the three-pin inductor is connected with the positive electrode of the power supply, pin 3 of the three-pin inductor is connected with the collector electrode of the third triode, pin 2 of the three-pin inductor is connected with the twelfth capacitor, and the other end of the twelfth capacitor is the transmitting end of the audio and video signals of the audio and video mixed transmitting circuit; and the emitter of the third triode is also connected with a thirteenth capacitor, and the other end of the thirteenth capacitor is grounded.
5. The wireless screen transmitter according to claim 4, wherein an adjustable resistor is further connected to an emitter of the third transistor, pin 2 of the adjustable resistor is connected to the emitter of the third transistor, pin 1 of the adjustable resistor is grounded, pin 3 of the adjustable resistor is connected to a fourteenth capacitor and a fifteenth capacitor, the other end of the fourteenth capacitor is grounded, and the other end of the fifteenth capacitor is an input end of the video signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921603180.7U CN211403420U (en) | 2019-09-25 | 2019-09-25 | Wireless screen transmission device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921603180.7U CN211403420U (en) | 2019-09-25 | 2019-09-25 | Wireless screen transmission device |
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| CN211403420U true CN211403420U (en) | 2020-09-01 |
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| CN201921603180.7U Active CN211403420U (en) | 2019-09-25 | 2019-09-25 | Wireless screen transmission device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117052380A (en) * | 2023-10-10 | 2023-11-14 | 四川宏大安全技术服务有限公司 | Wireless pressure measurement device and method |
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2019
- 2019-09-25 CN CN201921603180.7U patent/CN211403420U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117052380A (en) * | 2023-10-10 | 2023-11-14 | 四川宏大安全技术服务有限公司 | Wireless pressure measurement device and method |
| CN117052380B (en) * | 2023-10-10 | 2024-01-02 | 四川宏大安全技术服务有限公司 | Wireless pressure measurement device and method |
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