Laser wireless sound transmission device

Abstract

The utility model relates to a laser wireless sound transmission device, and the device comprises a sound input unit which is used for inputting a first sound wave signal; the signal amplification unit is connected with the sound input unit and is used for amplifying the first sound wave signal and then outputting a second sound wave signal; the signal transmitting unit is connected with the signal amplifying unit and is used for converting the second sound wave signal into a laser signal and outputting the laser signal; the signal receiving unit is connected with the signal receiving unit and is used for demodulating the laser signal into an analog signal and outputting the analog signal; the power amplification unit is connected with the signal receiving unit and is used for amplifying the output power of the analog signal; and the sound output unit is connected with the power amplification unit and is used for outputting a sound signal loaded by the analog signal. According to the invention, high-definition and low-delay audio transmission can be realized, the stability of signal transmission is improved, and the audio transmission quality is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of light transmission, and in particular to a laser wireless sound transmission device. Background Art

[0002] With the continuous development of science and technology, sound transmission technology is also gradually evolving. In existing technologies, such as laser wireless sound transmission devices using foldable photoelectric films, there are certain bottlenecks in practical applications. When the photoelectric film is folded, compression force will be generated on the inside and tension force will be generated on the outside. Under the repeated action of these external forces, the surface of the photoelectric film may be broken, cracked and wrinkled, affecting the reception and conversion of photoelectric signals, resulting in poor stability of signal transmission and affecting the quality of audio transmission. Utility Model Content

[0003] The present application provides a laser wireless sound transmission device to solve the technical problem that the existing wireless sound transmission system has poor signal transmission stability and affects the audio transmission quality.

[0004] In a first aspect, an embodiment of the present application provides a laser wireless sound transmission device, comprising: a sound input unit for inputting a first sound wave signal; a signal amplifying unit connected to the sound input unit, for amplifying the first sound wave signal and then outputting a second sound wave signal; a signal transmitting unit connected to the signal amplifying unit, for converting the second sound wave signal into a laser signal and then outputting it; a signal receiving unit connected to the signal receiving unit, for demodulating the laser signal into an analog signal and then outputting it; a power amplifying unit connected to the signal receiving unit, for amplifying the output power of the analog signal; and a sound output unit connected to the power amplifying unit, for outputting a sound signal loaded with the analog signal, so as to achieve high-definition and low-latency audio transmission.

[0005] In a possible implementation, the signal amplification unit includes a transistor and an operational amplifier connected to each other, the transistor is used to amplify a weak signal in the first sound wave signal into a second sound wave signal, and the operational amplifier is used to increase the amplification factor of the second sound wave signal.

[0006] In a possible implementation, the signal transmitting unit includes a laser transmitter, which converts the second sound wave signal into a laser signal and transmits the laser signal in a directionally manner to the signal receiving unit.

[0007] In one possible implementation, the signal receiving unit includes a signal transceiver consisting of a laser diode and a photosensor. The photosensor is used to convert the laser signal into an analog signal. When the signal transmitting unit inputs a first sound wave signal with a frequency of 300Hz, 1000Hz, or 3000Hz, the output voltage effective value of the signal receiving unit is greater than or equal to 0.4V.

[0008] In a possible implementation, the energy of the laser signal received by the signal receiving unit is greater than or equal to a preset laser energy threshold to ensure the output power of the photosensitive sensor.

[0009] In a possible implementation, the sound input unit includes any one of a microphone, a Φ3.5mm audio interface, and a signal generator, and the frequency range of the first sound wave signal is 300 Hz to 3400 Hz.

[0010] In a possible implementation manner, the distance between the signal transmitting unit and the signal receiving unit is greater than or equal to 2 m.

[0011] In a possible implementation, the power amplification unit includes a power amplifier and a filter connected to each other, the power amplifier is used to amplify the power of the analog signal, and the filter is used to remove noise and interference signals in the analog signal.

[0012] In a possible implementation, the sound output unit includes a speaker and / or a Φ3.5mm audio interface to achieve speaker playback or 3.5mm audio interface connected to earphone playback.

[0013] In a possible implementation, the signal transmitting unit is provided with a first fixing device, and the signal receiving unit is provided with a second fixing device corresponding to the first fixing device, which is used to direct the transmitting end of the signal transmitting unit toward the receiving end of the signal receiving unit.

[0014] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0015] The embodiment of the present application provides a laser wireless sound transmission device, in which the signal transmitting unit loads a digitized sound wave signal onto a laser signal and transmits it to the signal receiving unit in the form of a laser beam. The signal receiving unit restores the sound wave signal in the laser beam to an analog signal through demodulation technology, and the signal loaded by the laser beam can be directly converted into a corresponding sound signal to achieve wireless transmission of sound. Since laser communication has high bandwidth and high transmission rate, it can support high-quality sound transmission; secondly, the laser beam has strong directionality and strong anti-interference ability, which can improve the stability of signal transmission. Compared with the prior art, the present application can achieve high-definition and low-latency audio transmission, improve the stability of signal transmission, and ensure the quality of audio transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0019] Figure 1 A structural block diagram of a laser wireless sound transmission device provided in an embodiment of the present application, wherein the dotted line indicates transmission with a laser signal;

[0020] Figure 2 An overall circuit diagram of a laser wireless sound transmission device provided in one embodiment of the present application;

[0021] Figure 3 A circuit diagram of a signal amplification unit provided in an embodiment of the present application;

[0022] Figure 4 A power amplifier circuit diagram of a power amplifier unit provided in an embodiment of the present application;

[0023] Figure 5 A filter circuit diagram of a power amplifier unit provided in an embodiment of the present application;

[0024] Figure 6 This is an overall circuit diagram of a laser wireless sound transmission device provided in another embodiment of the present application.

[0025] Description of reference numerals:

[0026] 1. Sound input unit; 2. Signal amplifying unit; 3. Signal transmitting unit; 31. First fixing device; 4. Signal receiving unit; 41. Second fixing device; 5. Power amplifying unit; 6. Sound output unit. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0028] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0029] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0030] In order to solve the technical problem that the existing wireless sound transmission system has poor signal transmission stability and affects the audio transmission quality, the present application provides a laser wireless sound transmission device that can achieve high-definition and low-latency audio transmission, improve the stability of signal transmission, and ensure the audio transmission quality.

[0031] Figure 1 and Figure 2A laser wireless sound transmission device provided in an embodiment of the present application includes a sound input unit 1, a signal amplifying unit 2, a signal transmitting unit 3, a signal receiving unit 4, a power amplifying unit 5 and a sound output unit 6, wherein the sound input unit 1 is used to input a first sound wave signal, and the first sound wave signal is loaded with a sound signal; the signal amplifying unit 2 is connected to the sound input unit 1, and is used to amplify the first sound wave signal and then output a second sound wave signal; the signal transmitting unit 3 is connected to the signal amplifying unit 2, and is used to convert the second sound wave signal into a laser signal and then output it; the signal receiving unit 4 is connected to the signal receiving unit 4, and is used to demodulate the laser signal into an analog signal and then output it; the power amplifying unit 5 is connected to the signal receiving unit 4, and is used to amplify the power of the analog signal; the sound output unit 6 is connected to the power amplifying unit 5, and is used to output the sound signal loaded with the analog signal, so as to achieve high-definition and low-latency audio transmission.

[0032] It can be understood that the signal transmitting unit 3 loads the digitized sound wave signal onto the laser signal and transmits it to the signal receiving unit 4 in the form of a laser beam. The signal receiving unit 4 restores the sound wave signal in the laser beam to an analog signal through demodulation technology. The signal loaded by the laser beam can be directly converted into a corresponding sound signal to achieve wireless transmission of sound. Since laser communication has high bandwidth and high transmission rate, it can support high-quality sound transmission; secondly, the laser beam has strong directionality and strong anti-interference ability, which can improve the stability of signal transmission. Compared with the prior art, the present application can achieve high-definition and low-latency audio transmission, improve the stability of signal transmission, and ensure the quality of audio transmission.

[0033] Since the transistor has the disadvantages of very small input impedance and large input current when conducting, it is difficult to manufacture inductive components in the integrated circuit process; it is also difficult to manufacture capacitors with a capacity greater than 200PF, and the capacitor has a short life and very unstable performance. Therefore, if the capacitor capacity is too large, it will not only increase the cost of circuit components and operation and maintenance, but also reduce circuit efficiency and increase in reactive power. At the same time, using capacitors with too large capacity may cause the frequency response capability of the power system to decrease, especially in low-voltage networks, which may cause harmonics, overvoltage and other problems, resulting in large changes in system load. Capacitors with too large capacity generally cannot flexibly respond to load changes, affecting the compensation effect of the power factor, and bringing potential risks to devices and modules, so capacitors should be avoided in integrated circuits. Therefore, the present application adopts a transistor and an operational amplifier to form a signal amplification unit 2 to solve the problems caused by large-capacity capacitors, and the specific implementation method is described as follows.

[0034] like Figure 3As shown, the signal amplification unit 2 includes a connected transistor and an operational amplifier, the transistor is used to amplify the weak signal in the first sound wave signal into a second sound wave signal with a larger amplitude, and the operational amplifier is used to increase the amplification factor of the second sound wave signal, thereby amplifying the high-frequency signal in the first sound wave signal. The operational amplifier has a very high operational gain, which can effectively amplify the weak signal in the first sound wave signal; at the same time, the operational amplifier has the advantages of high input impedance and low output impedance, which has little effect on the load of the circuit, and can bear a large output current, ensuring the quality and stability of the output signal; in addition, the operational amplifier has a wide frequency band, which is suitable for amplifying high-frequency signals. Within the rated working range, the operational amplifier maintains very good linearity and can maintain a high amplification accuracy. Direct coupling is used between each level, so it is suitable for the requirements of integrated circuits.

[0035] The signal transmitting unit 3 includes a laser transmitter, which converts the second sound wave signal into a laser signal, that is, the sound signal is loaded on the laser beam, and transmits the laser signal in a direction to the signal receiving unit 4. The laser transmitter has the advantage of small divergence, so that the laser signal is transmitted in a direction, thereby improving the stability of signal transmission.

[0036] The signal receiving unit 4 includes a signal transceiver composed of a laser diode and a photosensitive sensor. The photosensitive sensor is a sensitive device that responds to or converts external light signals or light radiation, and is used to convert laser signals into analog signals, thereby receiving laser signals. When the signal transmitting unit 3 inputs the first sound wave signal with a frequency of 300Hz, 1000Hz, and 3000Hz, the output voltage effective value of the signal receiving unit 4 is greater than or equal to 0.4V. The photosensitive sensor can be a photosensitive sensor of model OPT101. The embodiment of the present application uses high-frequency modulation and demodulation technology to ensure the accurate restoration of sound signals and improve the quality and efficiency of sound transmission.

[0037] When the signal receiving unit 4 receives the laser signal, the brightness of the light emitted by the laser diode indicates the strength of the laser signal, thereby simply and intuitively showing the strength of the signal.

[0038] The laser signal energy received by the signal receiving unit 4 is greater than or equal to the preset laser energy threshold to ensure the output power of the photosensor, so as to ensure the accuracy and stability of the laser signal transmission. If the received laser signal energy is too much, it will cause the subsequent power amplification saturation to decrease, reduce the output power, and thus affect the efficiency of the laser wireless sound transmission device. Therefore, preferably, the laser signal energy received by the signal receiving unit 4 is exactly equal to the preset laser energy threshold.

[0039] Optionally, the sound input unit 1 includes any one of a microphone, a Φ3.5mm audio interface and a signal generator. The first sound wave signal is input through the microphone or the Φ3.5mm audio interface connected to the earphone, or a sine wave input is generated by the signal generator. The frequency range of the first sound wave signal is 300Hz to 3400Hz.

[0040] The distance between the signal transmitting unit 3 and the signal receiving unit 4 is greater than or equal to 2 m, which is the minimum transmission distance that the laser wireless sound transmission device can achieve.

[0041] like Figure 4 and Figure 5 As shown, the power amplification unit 5 includes a connected power amplifier and a filter. The power amplifier is used to amplify the power of the analog signal to provide sufficiently large power to the load (sound output unit 6), which can make the sound quality clearer and ensure that the signal can be transmitted to a farther distance; the filter adopts an active filter, which is used to remove noise and interference signals in the analog signal, improve the signal's anti-interference and noise ratio, and can adjust and optimize the signal by changing its amplitude, phase and other characteristics.

[0042] The sound output unit 6 uses a speaker or a Φ3.5mm audio interface, or both a speaker and a Φ3.5mm audio interface are provided to achieve speaker playback or 3.5mm audio interface connected to earphone playback.

[0043] Since the laser beam has a very high directivity, this brings difficulties to the aiming between the signal transmitting unit 3 and the signal receiving unit 4. In order to ensure accurate aiming between the transmitting and receiving points, the device needs to have high stability and precision.

[0044] In an optional embodiment, if Figure 6 As shown, the signal emitting unit 3 is provided with a first fixing device 31, and the signal receiving unit 4 is provided with a second fixing device 41 corresponding to the first fixing device 31, which is used to direct the emitting end of the laser transmitter of the signal emitting unit 3 toward the receiving end of the photosensor of the signal receiving unit 4, so that the laser transmitter of the signal emitting unit 3 can directionally emit the laser signal to the photosensor of the signal receiving unit 4, thereby improving the signal transmission accuracy between the signal emitting unit 3 and the signal receiving unit 4, and reducing the difficulty of aiming.

[0045] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described in the text are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0046] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0047] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A laser wireless sound transmission device, characterized in that: include: A sound input unit (1), used for inputting a first sound wave signal; A signal amplifying unit (2), connected to the sound input unit (1), and configured to amplify the first sound wave signal and output a second sound wave signal; A signal transmitting unit (3), connected to the signal amplifying unit (2), and used for converting the second sound wave signal into a laser signal and then outputting the laser signal; A signal receiving unit (4), connected to the signal receiving unit (4), and used for demodulating the laser signal into an analog signal and then outputting the analog signal; A power amplifying unit (5), connected to the signal receiving unit (4), and used to amplify the output power of the analog signal; as well as A sound output unit (6) is connected to the power amplification unit (5) and is used to output a sound signal loaded by the analog signal.

2. The laser wireless sound transmission device according to claim 1, characterized in that: The signal amplification unit (2) comprises a transistor and an operational amplifier connected to each other, the transistor being used to amplify a weak signal in the first sound wave signal into the second sound wave signal, and the operational amplifier being used to increase the amplification factor of the second sound wave signal.

3. The laser wireless sound transmission device according to claim 1, characterized in that: The signal transmitting unit (3) comprises a laser transmitter, which converts the second sound wave signal into the laser signal and then transmits the laser signal in a directionally directed manner to the signal receiving unit (4).

4. The laser wireless sound transmission device according to claim 1, characterized in that: The signal receiving unit (4) comprises a signal transceiver composed of a laser diode and a photosensor, wherein the photosensor is used to convert a laser signal into an analog signal, and when the signal transmitting unit (3) inputs a first sound wave signal with a frequency of 300 Hz, 1000 Hz, or 3000 Hz, the output voltage effective value of the signal receiving unit (4) is greater than or equal to 0.4 V.

5. The laser wireless sound transmission device according to claim 4, characterized in that: The laser signal energy received by the signal receiving unit (4) is greater than or equal to a preset laser energy threshold value, so as to ensure the output power of the photosensor.

6. The laser wireless sound transmission device according to claim 1, characterized in that: The sound input unit (1) comprises any one of a microphone, a Φ3.5mm audio interface and a signal generator, and the frequency range of the first sound wave signal is 300 Hz to 3400 Hz.

7. The laser wireless sound transmission device according to claim 1, characterized in that: The distance between the signal transmitting unit (3) and the signal receiving unit (4) is greater than or equal to 2 m.

8. The laser wireless sound transmission device according to claim 1, characterized in that: The power amplification unit (5) comprises a power amplifier and a filter connected to each other, the power amplifier is used to perform power amplification on the analog signal, and the filter is used to remove noise and interference signals from the analog signal.

9. The laser wireless sound transmission device according to claim 1, characterized in that: The sound output unit (6) comprises a speaker and / or a Φ3.5mm audio interface to achieve speaker playback or 3.5mm audio interface connected to earphone playback.

10. The laser wireless sound transmission device according to claim 1, characterized in that: The signal transmitting unit (3) is provided with a first fixing device (31), and the signal receiving unit (4) is provided with a second fixing device (41) corresponding to the first fixing device (31), which is used to direct the transmitting end of the signal transmitting unit (3) toward the receiving end of the signal receiving unit (4).

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