CN215010694U - Wireless infrared receiving device - Google Patents
Wireless infrared receiving device Download PDFInfo
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- CN215010694U CN215010694U CN202120488204.XU CN202120488204U CN215010694U CN 215010694 U CN215010694 U CN 215010694U CN 202120488204 U CN202120488204 U CN 202120488204U CN 215010694 U CN215010694 U CN 215010694U
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Abstract
The utility model provides a wireless infrared receiving device belongs to the electronic circuit structure field. The utility model discloses an infrared receiving circuit, signal amplification circuit, mixing circuit, crystal oscillator frequency doubling circuit and single chip microcomputer circuit, wherein, infrared receiving circuit is used for receiving infrared signal, the infrared ray signal of signal amplification circuit's input termination infrared receiving circuit output, the output links to each other with mixing circuit's input, single chip microcomputer circuit is equipped with a crystal oscillator, crystal oscillator frequency doubling circuit's input links to each other with the crystal oscillator output, and after the crystal oscillator amplification set multiple, the output gives mixing circuit, mixing circuit exports the mixed back of two tunnel frequencies, exports for the back level and handles. The utility model has the advantages that: the circuit is simple, the product consistency is good, and the reliability is high.
Description
Technical Field
The utility model relates to an electronic circuit structure especially relates to a wireless infrared receiving device.
Background
The infrared receiving device is generally used for convenient wireless transmission of education, television remote control, vehicle-mounted DVD and the like, and has strong privacy while not interfering other people.
Present infrared wireless device, for example, all parameters of infrared wireless earphone are all realized through hardware circuit, adopt a large amount of inductances in the circuit, ceramic filter, adjustable resistance, expensive components and parts such as well week, not only the price is expensive, cause the processing cost to be high at present, and, in the course of working, every all needs artifical adjustment and correction many times, the uniformity of product is poor during production, the reliability is low, the work load of adjustment is big, professional requirement to the processing personnel is higher, seriously restrict the machining efficiency of product, bring harmful effects to the mass production of product.
SUMMERY OF THE UTILITY MODEL
For solving the problem that the product uniformity is poor among the prior art, machining efficiency is low, the utility model provides a wireless infrared receiving device.
The utility model discloses an infrared receiving circuit, signal amplification circuit, mixing circuit, crystal oscillator frequency doubling circuit and single chip microcomputer circuit, wherein, infrared receiving circuit is used for receiving infrared signal, the infrared ray signal of signal amplification circuit's input termination infrared receiving circuit output, the output links to each other with mixing circuit's input, single chip microcomputer circuit is equipped with a crystal oscillator, crystal oscillator frequency doubling circuit's input links to each other with the crystal oscillator output, and after the crystal oscillator amplification set multiple, the output gives mixing circuit, mixing circuit exports the mixed back of two tunnel frequencies, exports for the back level and handles.
The utility model discloses do further improvement, still include intermediate frequency demodulation circuit, be used for following the intermediate frequency infrared signal demodulation of mixing circuit processing output goes out audio signal, then exports for the back stage processing.
The utility model discloses do further improvement, still include volume control circuit and audio power amplifier drive circuit, volume control circuit's input links to each other with intermediate frequency demodulation circuit output, and the volume control end links to each other with the control pin of singlechip circuit, volume control circuit's output links to each other with audio power amplifier drive circuit's input, audio power amplifier drive circuit's output drive signal.
The utility model discloses make further improvement, still include audio output interface, audio output interface links to each other with audio playback equipment for the audio frequency after the output is adjusted.
The utility model discloses make further improvement, audio output interface includes the loudspeaker interface or is used for pegging graft audio playback equipment's socket.
The utility model discloses do further improvement, the signal that infrared receiving circuit received is stereo signal, including left channel infrared signal and right channel infrared signal, intermediate frequency demodulation circuit includes left channel demodulation unit and right channel demodulation unit, the volume control circuit includes two volume control units, links to each other with left channel demodulation unit and right channel demodulation unit respectively, exports left channel audio signal and right channel audio signal behind the two tunnel volume control.
The utility model discloses make further improvement, infrared receiving circuit is binary channels receiving circuit, single chip microcomputer circuit includes singlechip IC5 and the binary channels change over switch SW1 that links to each other with singlechip IC5 input for switch over and receive the infrared signal passageway.
The utility model discloses do further improvement, infrared receiving circuit includes infrared receiving port P1, P2, inductance L1, inductance L2 and triode T3, wherein, infrared receiving port P1 links to each other with inductance L1's one end, inductance L1's other end ground connection, inductance L2's one end links to each other with infrared receiving port P1, and the other end is established ties with triode T3, triode T3's base links to each other with singlechip IC5 control pin 18, and interface P1 and interface P2 link to each other with signal amplification circuit's input respectively.
The utility model discloses do further improvement, crystal oscillator frequency doubling circuit includes triode T5, triode T9, wherein, triode T5's base links to each other with the crystal oscillator output, the projecting pole is through parallelly connected resistance and electric capacity ground connection, triode T5's collecting electrode links to each other with triode T9's base through one concatenating electric capacity, triode T9's projecting pole ground connection, the collecting electrode links to each other with mixing circuit's input.
The utility model discloses do further improvement, mixing circuit includes triode T4, triode T4's base links to each other with signal amplification circuit's output and crystal oscillator frequency doubling circuit's output respectively to connect the collecting electrode through resistance R19, triode T4's projecting pole ground connection, infrared signal after the collecting electrode output mixing.
Compared with the prior art, the beneficial effects of the utility model are that: the circuit is simple, the product consistency is good, and the reliability is high; in the production process, the steps of adjustment and correction are omitted, the requirement on the professional skills of personnel is low, and the production efficiency is greatly improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic diagram of an infrared receiving circuit, a signal amplifying circuit, a mixing circuit and a crystal oscillator frequency doubling circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a frequency demodulation circuit, a single chip circuit, and a power supply circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a volume adjusting circuit and an audio power amplifier driving circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the utility model discloses an infrared receiving circuit, signal amplification circuit, mixing circuit, crystal oscillator frequency doubling circuit and single chip microcomputer circuit, wherein, infrared receiving circuit is used for receiving infrared signal, the infrared signal of signal amplification circuit's input termination infrared receiving circuit output, the output links to each other with mixing circuit's input, single chip microcomputer circuit is equipped with a crystal oscillator, crystal oscillator frequency doubling circuit's input links to each other with the crystal oscillator output, and after the crystal oscillator amplification set multiple, output gives mixing circuit, mixing circuit exports two way frequencies after mixing.
The utility model discloses still include intermediate frequency demodulation circuit, be used for following the intermediate frequency infrared signal demodulation audio signal of mixing circuit processing output, then output.
The utility model discloses do further improvement, still include volume control circuit and audio power amplifier drive circuit, volume control circuit's input links to each other with intermediate frequency demodulation circuit output, and the volume control end links to each other with the control pin of singlechip circuit, volume control circuit's output links to each other with audio power amplifier drive circuit's input, audio power amplifier drive circuit's output drive signal.
The audio output interface of the embodiment can be directly connected with a loudspeaker to output audio signals through the loudspeaker, and can also be arranged as a socket for connecting audio playing equipment such as earphones or sound boxes.
The crystal oscillator in the single chip circuit of the embodiment outputs stable frequency, then the crystal oscillator frequency is amplified to proper frequency through the frequency doubling circuit, and the crystal oscillator frequency is mixed with the originally received infrared frequency to output an accurate frequency signal which can be modulated. The frequency of the crystal oscillator is set by the single chip microcomputer, accurate output of the frequency can be achieved without expensive components such as a specific inductor, an adjustable resistor and a middle frequency, the product processing efficiency is improved, the consistency of the product is good, when the product is tested, only the signal output and the signal frequency and amplitude need to be detected, whether the circuit is qualified can be judged, the frequency of different products is not required to be calibrated one by one, the steps of correction and frequency adjustment are avoided, the production process is greatly simplified, and the mass production of the product is facilitated.
As shown in fig. 2-4, as an embodiment of the utility model, the on-vehicle audio receiving arrangement is applied to this example, the signal that infrared receiving circuit received is stereo signal, including left channel infrared signal and right channel infrared signal, intermediate frequency demodulation circuit includes left channel demodulation unit and right channel demodulation unit, volume control circuit includes two volume control units, links to each other with left channel demodulation unit and right channel demodulation unit respectively, exports two way volume control's left channel audio signal and right channel audio signal after. Similarly, the audio power amplifier driving circuit is also driven by two paths, and then is divided into a left sound channel and a right sound channel to be respectively output to the rear stage for output, and the audio power amplifier driving circuit of the embodiment is provided with a socket J1 for a user to plug in an earphone to listen to an audio signal. In addition, two interfaces P6 and P8 are reserved in the embodiment, and the loudspeaker can be directly connected.
Preferably, the present embodiment can simultaneously receive 2.3M left channel signals and 2.8M right channel signals, can also simultaneously receive 3.2M left channel signals and 3.8M right channel signals, can simultaneously realize the reception of two paths of left and right channel signals, is suitable for simultaneous reception by people in different seats, and does not cause crosstalk.
Specifically, as shown in fig. 2 and 3, the infrared receiving circuit of this embodiment is a dual-channel receiving circuit, and the single chip microcomputer circuit includes a single chip microcomputer IC5 and a dual-channel switch SW1 connected to an input end of a single chip microcomputer IC5, and is configured to switch a channel for receiving an infrared signal. When the dual-channel switch SW1 is switched to the channel A for receiving (the pin 3 of the SW1 is connected with the pin 2), the pin SW of the singlechip IC5 is grounded through the resistor R22, at the moment, the SW is at a low level, and the singlechip IC5 recognizes the channel A for receiving; when the dual-channel switch SW1 is switched to the B-channel for reception (pin 3 of SW1 is connected with pin 4), the SW pin of the singlechip IC5 is suspended, at the moment, SW is high level, and the singlechip IC5 recognizes the B-channel for reception.
The infrared receiving circuit comprises infrared receiving ports P1 and P2, an inductor L1, an inductor L2 and a triode T3, wherein the infrared receiving port P1 is connected with one end of the inductor L1, the other end of the inductor L1 is grounded, one end of the inductor L2 is connected with an infrared receiving port P1, the other end of the inductor L2 is connected with the triode T3 in series, the base of the triode T3 is connected with a control pin 18 of a singlechip IC5, and an interface P1 and an interface P2 are connected with the input end of the signal amplifying circuit respectively. The infrared receiving ports P1 and P2 in this example are infrared receiving tubes for receiving infrared signals of the left and right channels.
The triode T3 is a change-over switch, and is switched on and off by receiving signals of the singlechip IC5, so that the inductor L1(A channel) or the inductor L1 and the inductor L2 are connected in parallel (B channel) for receiving, and the infrared signals with different frequencies are received by switching the two channels.
The crystal oscillator frequency doubling circuit comprises a triode T5 and a triode T9, wherein the base electrode of the triode T5 is connected with the output end of the crystal oscillator, the emitting electrode of the triode T5 is grounded through a resistor and a capacitor which are connected in parallel, the collecting electrode of the triode T5 is connected with the base electrode of the triode T9 through a series capacitor, the emitting electrode of the triode T9 is grounded, and the collecting electrode of the triode T5 is connected with the input end of the frequency mixing circuit. The transistor T5 in this example is used to increase the frequency of the crystal oscillator by multiples, and the transistor T9 is an amplifier tube, which amplifies the signal and outputs it to the mixer circuit.
The mixer circuit of this example includes triode T4 as the mixing tube, the base of triode T4 is connected with the output of the signal amplification circuit and the output of the crystal oscillator frequency doubling circuit respectively, and is connected with the collector through resistor R19, the emitter of triode T4 is grounded, the collector outputs the infrared ray signal after mixing. The mixing tube mixes the low-frequency signal input by the signal amplifying circuit with the frequency signal output by the crystal oscillator frequency doubling circuit and outputs an intermediate-frequency signal meeting the demodulation requirement.
2-4, no matter it is an infrared receiving circuit, a mixing circuit, or a crystal oscillator frequency doubling circuit, it is unnecessary to balance any electronic component in the whole process, and the circuit is simple and reliable. Therefore, the production efficiency of the product is greatly improved, and meanwhile, the circuit is simplified, and the product cost is also greatly reduced.
The above-mentioned embodiments are the preferred embodiments of the present invention, and the scope of the present invention is not limited to the above-mentioned embodiments, and the scope of the present invention includes and is not limited to the above-mentioned embodiments, and all equivalent changes made according to the present invention are within the protection scope of the present invention.
Claims (10)
1. A wireless infrared receiving device is characterized in that: the infrared receiving circuit is used for receiving infrared signals, the input end of the signal amplifying circuit is connected with the infrared signals output by the infrared receiving circuit, the output end of the signal amplifying circuit is connected with the input end of the frequency mixing circuit, the single chip circuit is provided with a crystal oscillator, the input end of the crystal oscillator frequency mixing circuit is connected with the output end of the crystal oscillator, the crystal oscillator is amplified by a set multiple and then output to the frequency mixing circuit, and the frequency mixing circuit mixes two paths of frequencies and outputs the mixed frequency to a post-stage processing.
2. The wireless infrared receiving apparatus according to claim 1, characterized in that: the frequency mixer also comprises an intermediate frequency demodulation circuit which is used for demodulating the audio signal from the intermediate frequency infrared signal processed and output by the frequency mixing circuit and then outputting the audio signal to a post-stage for processing.
3. The wireless infrared receiving apparatus according to claim 2, characterized in that: the volume control circuit is characterized by further comprising a volume adjusting circuit and an audio power amplifier driving circuit, wherein the input end of the volume adjusting circuit is connected with the output end of the intermediate frequency demodulation circuit, the volume control end is connected with a control pin of the single chip microcomputer circuit, the output end of the volume adjusting circuit is connected with the input end of the audio power amplifier driving circuit, and the output end of the audio power amplifier driving circuit outputs a driving signal.
4. The wireless infrared receiving apparatus according to claim 3, characterized in that: the audio output interface is connected with the audio playing equipment and used for outputting the adjusted audio.
5. The wireless infrared receiving apparatus according to claim 4, characterized in that: the audio output interface comprises a loudspeaker interface or a socket for plugging audio playing equipment.
6. The wireless infrared receiving apparatus according to claim 4, characterized in that: the signal that infrared receiving circuit received is the stereo signal, including left channel infrared signal and right channel infrared signal, intermediate frequency demodulation circuit includes left channel demodulation unit and right channel demodulation unit, volume control circuit includes two volume control units, links to each other with left channel demodulation unit and right channel demodulation unit respectively, exports two way volume control's left channel audio signal and right channel audio signal after.
7. The wireless infrared receiving apparatus according to any one of claims 1 to 6, characterized in that: the infrared receiving circuit is a double-channel receiving circuit, and the single chip microcomputer circuit comprises a single chip microcomputer IC5 and a double-channel change-over switch SW1 connected with the input end of the single chip microcomputer IC5 and used for changing over a channel for receiving infrared signals.
8. The wireless infrared receiving apparatus according to claim 7, characterized in that: the infrared receiving circuit comprises infrared receiving ports P1 and P2, an inductor L1, an inductor L2 and a triode T3, wherein the infrared receiving port P1 is connected with one end of the inductor L1, the other end of the inductor L1 is grounded, one end of the inductor L2 is connected with an infrared receiving port P1, the other end of the inductor L2 is connected with the triode T3 in series, the base of the triode T3 is connected with a control pin 18 of a singlechip IC5, and an interface P1 and an interface P2 are connected with the input end of the signal amplifying circuit respectively.
9. The wireless infrared receiving apparatus according to any one of claims 1 to 6, characterized in that: the crystal oscillator frequency doubling circuit comprises a triode T5 and a triode T9, wherein the base electrode of the triode T5 is connected with the output end of the crystal oscillator, the emitting electrode of the triode T5 is grounded through a resistor and a capacitor which are connected in parallel, the collecting electrode of the triode T5 is connected with the base electrode of the triode T9 through a series capacitor, the emitting electrode of the triode T9 is grounded, and the collecting electrode of the triode T5 is connected with the input end of the mixing circuit.
10. The wireless infrared receiving apparatus according to claim 9, characterized in that: the mixing circuit comprises a triode T4, the base electrode of the triode T4 is respectively connected with the output end of the signal amplification circuit and the output end of the crystal oscillator frequency doubling circuit and is connected with the collector electrode through a resistor R19, the emitter electrode of the triode T4 is grounded, and the collector electrode outputs the infrared signal after mixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120488204.XU CN215010694U (en) | 2021-03-05 | 2021-03-05 | Wireless infrared receiving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120488204.XU CN215010694U (en) | 2021-03-05 | 2021-03-05 | Wireless infrared receiving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215010694U true CN215010694U (en) | 2021-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120488204.XU Active CN215010694U (en) | 2021-03-05 | 2021-03-05 | Wireless infrared receiving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215010694U (en) |
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2021
- 2021-03-05 CN CN202120488204.XU patent/CN215010694U/en active Active
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