Free space voice communication device and method

Abstract

The invention provides a free space voice communication device and method, and the device converts an obtained voice signal into a corresponding sound laser, and remotely transmits the sound laser to the ear of a target human body in the space. And the sound-inducing laser can excite the vibration of ear tissue cells and generate sound corresponding to the voice signal content to be independently acquired by a target human body. One-way transmission of the voice signal to the target human body is realized, the voice signal is prevented from being acquired by other people near the target human body, the target human body does not need to accept equipment, and the method can be applied to special scenes such as hostage rescue.

Description

Technical Field

[0001] The present invention relates to the field of laser-induced acoustic technology, and in particular to a free-space voice communication device and method. Background Art

[0002] Free space voice communication technology is an important branch of wireless communication, which can achieve high-quality voice communication without physical barriers (such as cables and base stations). Existing free space voice communication technologies all use radio waves as the carrier of information transmission, and realize voice communication services through signal processing, encoding and decoding algorithms, and antenna design technologies.

[0003] Existing spatial voice communication technologies mainly include the following aspects:

[0004] 1. Adaptive beamforming: By intelligently adjusting the beam direction of the antenna array, maximum reception of the target signal and effective suppression of interference signals are achieved, thereby improving the signal-to-noise ratio.

[0005] 2. Efficient encoding and decoding: Using advanced voice encoding technologies, such as Adaptive Multi-Rate (AMR) and EVS (Enhanced Voice Services), effectively reducing data transmission rate and saving bandwidth resources while ensuring voice quality.

[0006] 3. Channel coding and error correction: Channel coding technologies, such as Turbo codes and LDPC (Low-Density Parity-Check Codes), are used to enhance the error resistance of data during transmission and maintain communication stability even in environments with severe signal attenuation or interference.

[0007] 4. Spatial diversity and multipath utilization: Use a multi-antenna system to capture signals from different paths, combine these signals through signal processing technology, and improve the strength and reliability of the received signal.

[0008] Although the existing free space voice communication technology has made significant progress, there are still problems in the following aspects:

[0009] 1. Poor adaptability to complex environments: In complex environments such as extreme weather and urban canyons, radio signal attenuation and interference are very serious and effective voice communication cannot be guaranteed.

[0010] 2. Poor privacy and security: Radio signals can be easily intercepted and eavesdropped, and cannot effectively protect user privacy and data security.

[0011] 3. Dependence on communication equipment: Both the sender and the receiver need radio communication equipment to conduct voice communication. In particular, the receiver cannot conduct voice communication when the radio communication equipment he holds runs out of power or is lost.

[0012] Therefore, it is necessary to invent a communication method in which the receiver can receive private voice messages without relying on any communication equipment, while other people around the receiver cannot receive them. Summary of the invention

[0013] In view of the defects in the prior art, an object of the present invention is to provide a free space voice communication device and method.

[0014] According to a free space voice communication device provided by the present invention, the free space voice communication device converts the acquired voice signal into a corresponding acoustic laser, and remotely transmits the acoustic laser to the ear of a target human body in space;

[0015] The acoustic laser can stimulate the vibration of ear tissue cells, generating sounds corresponding to the content of the voice signal for the target human body to acquire separately.

[0016] Furthermore, the free space voice communication device comprises: a microphone 1, a voice signal modulator 2, an acoustic laser 3, a laser emission lens 4 and a manual regulator 5;

[0017] The microphone 1 is used to collect voice signals;

[0018] The voice signal modulator 2 is electrically connected to the microphone 1, and obtains a control signal for controlling the acoustic laser 3 according to the collected voice signal;

[0019] The acoustic laser 3 is electrically connected to the voice signal modulator 2, and outputs the acoustic laser according to the control signal;

[0020] The laser emitting lens 4 is connected to the acoustic laser 3 via an optical fiber;

[0021] The manual regulator 5 is connected to the acoustic laser 3 and is used to adjust the pulse on / off, pulse energy and / or laser spot size of the acoustic laser output by the acoustic laser 3 .

[0022] Furthermore, the free space voice communication device further comprises: an aiming and tracking mechanism 6;

[0023] The laser emitting lens 4 is connected to the aiming and tracking mechanism 6, and is used to automatically align the laser emitting lens 4 with the ear of the target human body.

[0024] Furthermore, the aiming and tracking mechanism 6 includes a distance detection module for detecting the distance between the target human body and the free space voice communication device.

[0025] Furthermore, the free space voice communication device further comprises: a sight 7;

[0026] The sighting mirror 7 is connected to the laser emitting lens 4 and shares the same optical path with the laser emitting lens 4 .

[0027] Furthermore, the free space voice communication device further comprises: an external power source 8, an internal battery 9;

[0028] The external power source 8 and the internal battery 9 are electrically connected to the acoustic laser 3 .

[0029] Furthermore, the wavelength of the acoustic laser is in the infrared band.

[0030] Furthermore, the infrared band includes 1000nm-2000nm.

[0031] A free space voice communication method provided by the present invention comprises: converting an acquired voice signal into a corresponding acoustic laser, and remotely transmitting the acoustic laser to the ear of a target human body in space;

[0032] The acoustic laser can stimulate the vibration of ear tissue cells, generating sounds corresponding to the content of the voice signal for the target human body to acquire separately.

[0033] Furthermore, the free space voice communication method adopts the free space voice communication device.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The present invention utilizes the principle of laser thermal expansion-induced sound to establish a one-way voice transmission channel from the transmitting device to the receiver, thereby realizing one-way transmission of voice signals to the target person, thereby preventing the voice signals from being obtained by other people near the target person. The target person does not need to receive the equipment, and can be applied to special scenarios such as hostage rescue. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0037] Figure 1 It is a structural diagram of free space voice communication equipment. DETAILED DESCRIPTION

[0038] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0039] like Figure 1 As shown, the present invention provides a free space voice communication device, comprising a microphone 1, a voice signal modulator 2, an acoustic laser 3, a laser emission lens 4 and a manual adjuster 5.

[0040] Microphone 1 is used to collect voice signals, which include the language of the user. The microphone can be a single microphone or a microphone array installed inside the device, or it can be an external wired or wireless microphone, which converts the collected voice signals into electrical signals. The microphone is preferably a micro-electromechanical system (MEMS) type microphone. The microphone can capture a frequency range of at least 200 Hz to 20 kHz corresponding to the frequency range of the hearing spectrum, and can capture a frequency range exceeding this range. In addition, the dynamic range of the microphone can be from 75 dB to 115 dB, preferably from 85 dB to 105 dB, and more preferably from 90 dB to 100 dB.

[0041] The speech signal modulator 2 is electrically connected to the microphone 1 , processes the electrical signal output by the microphone 1 , and modulates the signal to generate a control signal for controlling the acoustic laser 3 .

[0042] The process of converting electrical signals into laser control signals includes:

[0043] Step S1, obtaining the electrical signal of the sound signal.

[0044] Step S2: performing time-frequency analysis on the electrical signal.

[0045] Step S3: extracting acoustic signal features according to the time-frequency analysis results.

[0046] Step S4: Generate a control signal by modulating the extracted acoustic signal features.

[0047] Step S5, controlling the laser to output acoustic laser according to the control signal.

[0048] In step S1, the method for acquiring the electrical signal includes receiving the electrical signal in real time, amplifying the signal strength as required, and then outputting the electrical signal to a time-frequency analysis.

[0049] In step S2, the time-frequency analysis method includes analyzing the electrical signal in the time domain and the frequency domain, with the time domain focusing on analyzing the signal strength and the frequency domain focusing on analyzing the signal spectrum, and the maximum processing delay time of this step is 1 millisecond.

[0050] In step S3, the method for extracting the characteristics of the electrical signal includes filtering the acoustic signal, and the filtering range can be set, and the typical value can refer to the normal human hearing range, that is, 20Hz-20000Hz. The characteristics of the filtered electrical signal are extracted, and the characteristics include the start time of the positive pulse of the electrical signal, the time when the positive pulse reaches the maximum amplitude, the maximum amplitude, and the spectrum of the electrical signal, and the maximum amplitude is a voltage value.

[0051] In step S4, the control signal generated by modulation includes a pulse sequence. In the pulse sequence, the start time of each pulse is the start time of the positive pulse of the electrical signal, and the end time is the time when the positive pulse of the electrical signal reaches the maximum amplitude. In the pulse sequence, the amplitude of each pulse is the normalized amplitude of the positive pulse of the electrical signal multiplied by an amplification parameter. The normalized amplitude can be the normalized result of the maximum amplitude of the positive pulse of the electrical signal, the normalized result of the peak signal amplitude on the electrical signal spectrum, or the normalized result of the control voltage corresponding to the maximum output amplitude of the acoustic laser. The amplification parameter is adjusted according to the type of laser that specifically outputs the acoustic laser.

[0052] The acoustic laser 3 is electrically connected to the voice signal modulator 2, and controls the pulse on and off, pulse energy, and laser spot size according to the control signal, and outputs the corresponding acoustic laser. The wavelength of the acoustic laser is in the infrared band, and the preferred infrared band includes 1000nm-2000nm.

[0053] The laser emitting lens 4 is connected to the acoustic laser 3 via an optical fiber. The manual regulator 5 is connected to the acoustic laser 3 and is used to adjust the pulse on and off, pulse energy and / or laser spot size of the acoustic laser output by the acoustic laser 3. The manual regulator 54 can be in the form of a knob, a button, etc., and the present invention is not limited to this.

[0054] The equation for thermal expansion laser-induced acoustics is as follows:

[0055]

[0056] In the above formula, p is the sound pressure caused by laser thermal expansion, c is the sound speed, C p is the specific heat capacity of the medium, I(x,y,z,t) is the laser energy absorbed by the medium, where x, y, z are the three-dimensional coordinates of the acoustic signal receiving point, t is the time, and β is the expansion coefficient of the medium.

[0057] The above equation is a partial differential equation. One solution of this equation can be written as follows:

[0058]

[0059] In the above formula, P(ω) is the spectrum intensity of the photoacoustic signal, ω is the laser angular frequency, I0(ω) is the spectrum function of the laser pulse, A is the refractive index of the laser in the medium, P0 is the laser energy, β is the expansion coefficient of the medium, and C p is the specific heat capacity of the medium, H(ω) represents the transfer function from the laser signal to the acoustic signal, and its expression is as follows:

[0060]

[0061] In the above formula, e is a natural constant, j is an imaginary unit, r is the distance from the receiving end to the sound source, θ is the observation angle of the receiving end, ω is the laser angular frequency, μ is the laser absorption coefficient of the medium, and a is the radius of the laser spot.

[0062] The free space voice communication device converts the acquired voice signal into a corresponding acoustic laser, and transmits the acoustic laser to the ear of the target person remotely in space. The acoustic laser can stimulate the vibration of ear tissue cells and generate sound corresponding to the voice signal content for the target person to obtain separately.

[0063] Preferably, the free space voice communication device further comprises a sighting and tracking mechanism 6, in which the laser emission lens 4 is connected, and is used to automatically aim the laser emission lens 4 at the ear of the target human body. The sighting and tracking mechanism 6 comprises a distance detection module, which is used to detect the distance between the target human body and the free space voice communication device, so as to adjust the acoustic laser according to the distance. The pointing accuracy index of the sighting and tracking mechanism 6 at a communication distance of 100 meters is better than 0.005°, and the sighting and tracking accuracy is better than 0.005°.

[0064] In other embodiments, the free space voice communication device further includes: a sight 7, which is connected to the laser emitting lens 4 and shares an optical path with the laser emitting lens 4 to facilitate manual aiming.

[0065] The free space voice communication device further comprises an external power source 8 and an internal battery 9, and the external power source 8 and the internal battery 9 are electrically connected to the acoustic laser 3 for supplying power to the device.

[0066] The present invention also provides a free space voice communication method, using the above-mentioned free space voice communication device, the method comprising: acquiring a voice signal, converting the voice signal into an electrical signal. Converting the electrical signal into a laser control signal. Controlling the laser to output a laser pulse according to the laser control signal. Aiming at the ear of the target human body, the acoustic laser is remotely transmitted to the ear of the target human body in space. The acoustic laser can stimulate the vibration of ear tissue cells, and generate sound corresponding to the content of the voice signal for the target human body to acquire separately.

[0067] Those skilled in the art know that, in addition to realizing the system and its various devices, modules, and units provided by the present invention in a purely computer-readable program code, it is entirely possible to realize the same functions in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system and its various devices, modules, and units provided by the present invention can be considered as a hardware component, and the devices, modules, and units included therein for realizing various functions can also be regarded as structures within the hardware component; the devices, modules, and units for realizing various functions can also be regarded as both software modules for realizing the method and structures within the hardware component.

[0068] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A free space voice communication device, characterized in that: The free space voice communication device converts the acquired voice signal into a corresponding acoustic laser, and remotely transmits the acoustic laser to the ear of the target human body in space; The acoustic laser can stimulate the vibration of ear tissue cells, generating sounds corresponding to the content of the voice signal for the target human body to acquire separately.

2. The free space voice communication device according to claim 1, characterized in that: The free space voice communication device comprises: a microphone (1), a voice signal modulator (2), an acoustic laser (3), a laser emission lens (4) and a manual regulator (5); The microphone (1) is used to collect voice signals; The voice signal modulator (2) is electrically connected to the microphone (1) and obtains a control signal for controlling the acoustic laser (3) according to the collected voice signal; The acoustic laser (3) is electrically connected to the voice signal modulator (2) and outputs the acoustic laser according to the control signal; The laser emission lens (4) is connected to the acoustic laser (3) via an optical fiber; The manual regulator (5) is connected to the acoustic laser (3) and is used to adjust the pulse on / off, pulse energy and / or laser spot size of the acoustic laser output by the acoustic laser (3).

3. The free space voice communication device according to claim 2, characterized in that: The free space voice communication device further comprises: an aiming and tracking mechanism (6); The laser emitting lens (4) is connected to the aiming and tracking mechanism (6) and is used to automatically aim the laser emitting lens (4) at the ear of the target human body.

4. The free space voice communication device according to claim 3, characterized in that: The aiming and tracking mechanism (6) comprises a distance detection module, which is used to detect the distance between the target human body and the free space voice communication device.

5. The free space voice communication device according to claim 2, characterized in that: The free space voice communication device further comprises: a sight (7); The sighting mirror (7) is connected to the laser emitting lens (4) and shares an optical path with the laser emitting lens (4).

6. The free space voice communication device according to claim 2, characterized in that: The free space voice communication device further comprises: an external power source (8) and an internal battery (9); The external power source (8) and the internal battery (9) are electrically connected to the acoustic laser (3).

7. The free space voice communication device according to claim 1, characterized in that: The wavelength of the acoustic laser is in the infrared band.

8. The free space voice communication device according to claim 7, characterized in that: The infrared band includes 1000nm-2000nm.

9. A free space voice communication method, characterized in that: include: The acquired voice signal is converted into a corresponding acoustic laser, and the acoustic laser is remotely transmitted to the ear of the target human body in space; The acoustic laser can stimulate the vibration of ear tissue cells, generating sounds corresponding to the content of the voice signal for the target human body to acquire separately.

10. The free space voice communication method according to claim 9, characterized in that: The free space voice communication method adopts the free space voice communication device according to any one of claims 1-8.

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