CN112995840A - Sound transmission method, device and equipment based on ultrasonic waves and readable storage medium - Google Patents
Sound transmission method, device and equipment based on ultrasonic waves and readable storage medium Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for microphones
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L21/0216—Noise filtering characterised by the method used for estimating noise
- G10L21/0232—Processing in the frequency domain
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- G—PHYSICS
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- H04B—TRANSMISSION
- H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves
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- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
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Abstract
The invention discloses a sound transmission method, a sound transmission device, sound transmission equipment and a computer readable storage medium based on ultrasonic waves. Then another path of common-frequency ultrasonic waves are radiated to the space at the same time, and the ultrasonic waves have strong directivity and can not be heard by human ears, so that the ultrasonic waves can be transmitted at fixed points and the privacy of the ultrasonic waves in a transmission path is ensured; by positioning the target sound transmission position and determining the emission angle according to the target sound transmission position, the intersection position of two ultrasonic waves can be controlled at the target sound transmission position, and the original voice or sound signal can be analyzed by utilizing the difference frequency and sum frequency characteristics of sound waves at the intersection, so that the fixed-point private transmission of sound is realized, and the safety of outdoor use is ensured; meanwhile, ears can be liberated, and a user does not need to additionally wear equipment such as earphones, so that the technical problem that the privacy and the comfort are difficult to be considered in the conventional sound transmission method is solved.
Description
Technical Field
The present invention relates to the field of sound wave transmission technologies, and in particular, to a sound transmission method, device, and apparatus based on ultrasonic waves, and a computer-readable storage medium.
Background
With the continuous development of communication technology, audio communication has become an important component of human-to-human interaction. People communicate with each other through the telephone; various audios are listened through a walkman, a computer and the like, and the transmission of the sound is reflected in the aspects of daily life of people.
At present, sound is generally transmitted through a loudspeaker, once the sound is played, other bystanders except a sound receiver can also hear the sound, and therefore the privacy of sound playing cannot be guaranteed; the method for protecting the privacy of sound playing generally needs people to wear earphones, but no matter what type of earphones is used, uncomfortable experience can be brought to people due to long-time wearing, and therefore the technical problem that the privacy and the comfort are difficult to take into account in the existing sound transmission method is caused.
Disclosure of Invention
The invention mainly aims to provide a sound transmission method based on ultrasonic waves, and aims to solve the technical problem that privacy and comfort are difficult to take into account in the existing sound transmission method.
In order to achieve the above object, the present invention provides an ultrasonic-based sound transmission method, including:
acquiring a to-be-transmitted acoustic signal and two paths of same-frequency ultrasonic signals, mixing and filtering a first path of same-frequency ultrasonic signal in the two paths of same-frequency ultrasonic signals and the to-be-transmitted acoustic signal to filter out a sum frequency ultrasonic signal on which the first path of same-frequency ultrasonic signal and the to-be-transmitted acoustic signal are superposed;
positioning a target sound transmission position, and determining a first emission angle of the sum frequency ultrasonic signal and a second emission angle of a second channel of common frequency ultrasonic signals in the two channels of common frequency ultrasonic signals based on the target sound transmission position, wherein the first emission angle and the second emission angle are intersected at the target sound transmission position;
and simultaneously transmitting the sum frequency ultrasonic signal and the second channel of common frequency ultrasonic signal according to the first transmitting angle and the second transmitting angle so as to restore the acoustic signal to be transmitted when the sum frequency ultrasonic signal and the second channel of common frequency ultrasonic signal intersect at the target sound transmission position.
Optionally, the step of simultaneously transmitting the sum frequency ultrasonic signal and the second channel of common frequency ultrasonic signal according to the first transmission angle and the second transmission angle to restore the to-be-transmitted acoustic signal when the sum frequency ultrasonic signal intersects with the second channel of common frequency ultrasonic signal at the target sound transmission position includes:
utilizing an electroacoustic transducer to convert and focus the sum frequency ultrasonic signal and the second path of common frequency ultrasonic signal;
and simultaneously transmitting the focused sum frequency ultrasonic signal and a second path of common frequency ultrasonic signal according to the first transmitting angle and the second generating angle so as to enable the focused sum frequency ultrasonic signal and the second path of common frequency ultrasonic signal to be intersected at the target sound transmission position, wherein a difference frequency signal generated when the sum frequency ultrasonic signal is intersected with the second path of common frequency ultrasonic signal is equivalent to the sound signal to be transmitted.
Optionally, the step of locating the target sound transmission position, and determining the first emission angle of the sum frequency ultrasonic signal and the second emission angle of the second co-frequency ultrasonic signal in the two co-frequency ultrasonic signals based on the target sound transmission position, includes:
positioning the ear position of the receiver as the target sound transmission position;
and acquiring a first transmitting position of the sum frequency ultrasonic signal and a second transmitting position of the second path of co-frequency ultrasonic signal, and determining the first transmitting angle and the second transmitting angle by combining the first transmitting position, the second transmitting position and the ear position.
Optionally, the step of determining the first and second transmission angles in combination with the first and second transmission positions and the ear position comprises:
obtaining a first transmitting path according to the first transmitting position and the ear position, and obtaining a second transmitting path according to the second transmitting position and the ear position;
and determining a transmission reference plane, so as to obtain the first transmission angle based on an included angle between the first transmission path and the transmission reference plane, and obtain the second transmission angle based on an included angle between the second transmission path and the transmission reference plane.
Optionally, the step of locating the ear position of the recipient comprises:
and based on an infrared or ultrasonic positioning mode, positioning the ear position of the receiver.
Optionally, the step of mixing and filtering a first path of common-frequency ultrasonic signal in the two paths of common-frequency ultrasonic signals and the to-be-transmitted acoustic signal to filter out a sum-frequency ultrasonic signal on which the first path of common-frequency ultrasonic signal and the to-be-transmitted acoustic signal are superimposed includes:
mixing a first path of common-frequency ultrasonic signal and the to-be-transmitted sound signal by using a mixer so as to mix a sum frequency ultrasonic signal and a difference frequency signal of the to-be-transmitted sound signal and the first path of common-frequency ultrasonic signal;
and filtering the acoustic signal to be transmitted, the first path of common-frequency ultrasonic signal, the sum-frequency ultrasonic signal and the difference-frequency signal by using a filter to filter out the sum-frequency ultrasonic signal.
Optionally, the step of acquiring the to-be-transmitted acoustic signal and the two same-frequency ultrasonic signals includes:
acquiring an initial to-be-transmitted sound signal, and amplifying the initial to-be-transmitted sound signal by using an amplifier to obtain the to-be-transmitted sound signal;
two paths of same-frequency ultrasonic signals are sent out by an ultrasonic oscillator.
In order to achieve the above object, the present invention also provides an ultrasonic-based sound transmission device including:
the sum frequency signal filtering module is used for acquiring a to-be-transmitted acoustic signal and two paths of same frequency ultrasonic signals, mixing and filtering a first path of same frequency ultrasonic signal in the two paths of same frequency ultrasonic signals with the to-be-transmitted acoustic signal, and filtering out a sum frequency ultrasonic signal on which the first path of same frequency ultrasonic signal and the to-be-transmitted acoustic signal are superposed;
the transmitting angle determining module is used for positioning a target sound transmission position, and determining a first transmitting angle of the sum frequency ultrasonic signal and a second transmitting angle of a second channel of common frequency ultrasonic signal in the two channels of common frequency ultrasonic signals based on the target sound transmission position, wherein the first transmitting angle and the second transmitting angle are intersected at the target sound transmission position;
and the to-be-transmitted sound wave restoration module is used for simultaneously transmitting the sum frequency ultrasonic signal and the second channel of common frequency ultrasonic signal according to the first transmission angle and the second transmission angle so as to restore the to-be-transmitted sound signal when the sum frequency ultrasonic signal and the second channel of common frequency ultrasonic signal intersect at the target sound transmission position.
Optionally, the module for restoring the to-be-transmitted acoustic wave includes:
the conversion focusing unit is used for converting and focusing the sum frequency ultrasonic signal and the second path of same frequency ultrasonic signal by using an electroacoustic transducer;
and the intersection analysis unit is used for simultaneously transmitting the focused sum frequency ultrasonic signal and the second path of common frequency ultrasonic signal according to the first transmission angle and the second generation angle so as to intersect the focused sum frequency ultrasonic signal and the second path of common frequency ultrasonic signal at the target sound transmission position, wherein a difference frequency signal generated when the sum frequency ultrasonic signal intersects the second path of common frequency ultrasonic signal is equivalent to the sound signal to be transmitted.
Optionally, the transmission angle determining module includes:
an ear position locating unit for locating an ear position of the receiver as the target sound transmission position;
and the transmitting angle determining unit is used for acquiring a first transmitting position of the sum frequency ultrasonic signal and a second transmitting position of the second path of co-frequency ultrasonic signal, and determining the first transmitting angle and the second transmitting angle by combining the first transmitting position, the second transmitting position and the ear position.
Optionally, the transmission angle determining unit is further configured to:
obtaining a first transmitting path according to the first transmitting position and the ear position, and obtaining a second transmitting path according to the second transmitting position and the ear position;
and determining a transmission reference plane, so as to obtain the first transmission angle based on an included angle between the first transmission path and the transmission reference plane, and obtain the second transmission angle based on an included angle between the second transmission path and the transmission reference plane.
Optionally, the ear position locating unit is further configured to:
and based on an infrared or ultrasonic positioning mode, positioning the ear position of the receiver.
Optionally, the sum frequency ultrasonic signal filtering module includes:
a mixing signal obtaining unit, configured to mix a first channel of common-frequency ultrasonic signals and the to-be-transmitted acoustic signals by using a mixer, so as to mix sum-frequency ultrasonic signals and difference-frequency signals of the to-be-transmitted acoustic signals and the first channel of common-frequency ultrasonic signals;
and the sum frequency signal filtering unit is used for filtering the acoustic signal to be transmitted, the first path of common frequency ultrasonic signal, the sum frequency ultrasonic signal and the difference frequency signal by using a filter so as to filter out the sum frequency ultrasonic signal.
Optionally, the sum frequency ultrasonic signal filtering module further includes:
the device comprises a to-be-transmitted signal amplifying unit, a transmitting unit and a transmitting unit, wherein the to-be-transmitted signal amplifying unit is used for acquiring an initial to-be-transmitted acoustic signal and amplifying the initial to-be-transmitted acoustic signal by using an amplifier to obtain the to-be-transmitted acoustic signal;
and the same-frequency signal generating unit is used for sending two paths of same-frequency ultrasonic signals by utilizing the ultrasonic oscillator.
In addition, to achieve the above object, the present invention also provides an ultrasonic-based sound transmission apparatus including: a memory, a processor and an ultrasound-based sonogram stored on the memory and executable on the processor, the ultrasound-based sonogram when executed by the processor implementing the steps of the method as described above.
Furthermore, to achieve the above object, the present invention also provides a computer-readable storage medium having stored thereon an ultrasound-based acoustic program, which when executed by a processor, implements the steps of the method as described above.
The invention provides a sound transmission method, a sound transmission device, sound transmission equipment and a computer readable storage medium based on ultrasonic waves. The ultrasonic-based acoustic transmission method filters out a desired sum frequency ultrasonic signal by mixing an acoustic signal to be transmitted with ultrasonic waves. Then another path of common-frequency ultrasonic waves are radiated to the space at the same time, and the ultrasonic waves have strong directivity and can not be heard by human ears, so that the ultrasonic waves can be transmitted at fixed points and the privacy of the ultrasonic waves in a transmission path is ensured; by positioning the target sound transmission position and determining the emission angle according to the target sound transmission position, the intersection position of two ultrasonic waves can be controlled at the target sound transmission position, and the original voice or sound signal can be analyzed by utilizing the difference frequency and sum frequency characteristics of sound waves at the intersection, so that the fixed-point private transmission of sound is realized, and the safety of outdoor use is ensured; meanwhile, ears can be liberated, and a user does not need to additionally wear equipment such as earphones, so that the technical problem that the privacy and the comfort are difficult to be considered in the conventional sound transmission method is solved. In addition, the method also avoids the attenuation of the sound signal to be transmitted in the transmission process, and ensures the transmission integrity of the sound signal.
Drawings
Fig. 1 is a schematic structural diagram of an ultrasonic-based sound transmission device in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a first embodiment of the method for transmitting sound based on ultrasonic waves according to the present invention;
fig. 3 is a schematic view showing the position of an ear part in a second embodiment of the ultrasonic-based sound transmission method of the present invention;
FIG. 4 is a schematic flow chart of a third embodiment of the method for transmitting sound based on ultrasonic waves according to the present invention;
fig. 5 is a schematic view of functional modules of the ultrasonic-based sound transmission device according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, fig. 1 is a schematic structural diagram of an ultrasonic-based sound transmission device in a hardware operating environment according to an embodiment of the present invention. The ultrasonic-based sound transmission device may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The optional user interface 1003 may include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (non-volatile memory). The memory 1005 may alternatively be a memory device separate from the processor 1001 described above.
It will be understood by those skilled in the art that the ultrasonic-based acoustic transmission device structure shown in fig. 1 does not constitute a limitation of the ultrasonic-based acoustic transmission device, and may include more or less components than those shown, or some components in combination, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and an ultrasonic-based transaudient program.
In the ultrasound-based microphone device shown in fig. 1, the network interface 1004 is mainly used for connecting to a background server and communicating with the background server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be configured to call the ultrasound-based microphone program stored in the memory 1005 and perform the following operations:
acquiring a to-be-transmitted acoustic signal and two paths of same-frequency ultrasonic signals, mixing and filtering a first path of same-frequency ultrasonic signal in the two paths of same-frequency ultrasonic signals and the to-be-transmitted acoustic signal to filter out a sum frequency ultrasonic signal on which the first path of same-frequency ultrasonic signal and the to-be-transmitted acoustic signal are superposed;
positioning a target sound transmission position, and determining a first emission angle of the sum frequency ultrasonic signal and a second emission angle of a second channel of common frequency ultrasonic signals in the two channels of common frequency ultrasonic signals based on the target sound transmission position, wherein the first emission angle and the second emission angle are intersected at the target sound transmission position;
and simultaneously transmitting the sum frequency ultrasonic signal and the second channel of common frequency ultrasonic signal according to the first transmitting angle and the second transmitting angle so as to restore the acoustic signal to be transmitted when the sum frequency ultrasonic signal and the second channel of common frequency ultrasonic signal intersect at the target sound transmission position.
Further, the step of simultaneously transmitting the sum frequency ultrasonic signal and the second channel of common frequency ultrasonic signal according to the first transmission angle and the second transmission angle to restore the to-be-transmitted acoustic signal when the sum frequency ultrasonic signal and the second channel of common frequency ultrasonic signal intersect at the target sound transmission position includes:
utilizing an electroacoustic transducer to convert and focus the sum frequency ultrasonic signal and the second path of common frequency ultrasonic signal;
and simultaneously transmitting the focused sum frequency ultrasonic signal and a second path of common frequency ultrasonic signal according to the first transmitting angle and the second generating angle so as to enable the focused sum frequency ultrasonic signal and the second path of common frequency ultrasonic signal to be intersected at the target sound transmission position, wherein a difference frequency signal generated when the sum frequency ultrasonic signal is intersected with the second path of common frequency ultrasonic signal is equivalent to the sound signal to be transmitted.
Further, the step of locating a target sound transmission position, and determining a first emission angle of the sum frequency ultrasonic signal and a second emission angle of a second channel of common frequency ultrasonic signal in the two channels of common frequency ultrasonic signals based on the target sound transmission position includes:
positioning the ear position of the receiver as the target sound transmission position;
and acquiring a first transmitting position of the sum frequency ultrasonic signal and a second transmitting position of the second path of co-frequency ultrasonic signal, and determining the first transmitting angle and the second transmitting angle by combining the first transmitting position, the second transmitting position and the ear position.
Further, the step of determining the first and second transmission angles in conjunction with the first, second and ear positions comprises:
obtaining a first transmitting path according to the first transmitting position and the ear position, and obtaining a second transmitting path according to the second transmitting position and the ear position;
and determining a transmission reference plane, so as to obtain the first transmission angle based on an included angle between the first transmission path and the transmission reference plane, and obtain the second transmission angle based on an included angle between the second transmission path and the transmission reference plane.
Further, the step of locating the position of the ear of the recipient comprises:
and based on an infrared or ultrasonic positioning mode, positioning the ear position of the receiver.
Further, the step of mixing and filtering a first path of common-frequency ultrasonic signal in the two paths of common-frequency ultrasonic signals and the to-be-transmitted acoustic signal to filter out a sum frequency ultrasonic signal on which the first path of common-frequency ultrasonic signal and the to-be-transmitted acoustic signal are superimposed includes:
mixing a first path of common-frequency ultrasonic signal and the to-be-transmitted sound signal by using a mixer so as to mix a sum frequency ultrasonic signal and a difference frequency signal of the to-be-transmitted sound signal and the first path of common-frequency ultrasonic signal;
and filtering the acoustic signal to be transmitted, the first path of common-frequency ultrasonic signal, the sum-frequency ultrasonic signal and the difference-frequency signal by using a filter to filter out the sum-frequency ultrasonic signal.
Further, the step of acquiring the to-be-transmitted acoustic signal and the two paths of same-frequency ultrasonic signals includes:
acquiring an initial to-be-transmitted sound signal, and amplifying the initial to-be-transmitted sound signal by using an amplifier to obtain the to-be-transmitted sound signal;
two paths of same-frequency ultrasonic signals are sent out by an ultrasonic oscillator.
Based on the above hardware structure, various embodiments of the ultrasound-based sound transmission method of the present invention are proposed.
In order to solve the above-described problems, the present invention provides a sound transmission method using ultrasonic waves, in which a desired sum frequency ultrasonic signal is filtered out by mixing an acoustic signal to be transmitted with ultrasonic waves. Then another path of common-frequency ultrasonic waves are radiated to the space at the same time, and the ultrasonic waves have strong directivity and can not be heard by human ears, so that the ultrasonic waves can be transmitted at fixed points and the privacy of the ultrasonic waves in a transmission path is ensured; by positioning the target sound transmission position and determining the emission angle according to the target sound transmission position, the intersection position of two ultrasonic waves can be controlled at the target sound transmission position, and the original voice or sound signal can be analyzed by utilizing the difference frequency and sum frequency characteristics of sound waves at the intersection, so that the fixed-point private transmission of sound is realized, and the safety of outdoor use is ensured; meanwhile, ears can be liberated, and a user does not need to additionally wear equipment such as earphones, so that the technical problem that the privacy and the comfort are difficult to be considered in the conventional sound transmission method is solved. In addition, the method also avoids the attenuation of the sound signal to be transmitted in the transmission process, and ensures the transmission integrity of the sound signal.
Referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the acoustic transmission method based on ultrasonic waves.
A first embodiment of the present invention provides an ultrasonic-based sound transmission method, including:
step S10, obtaining a to-be-transmitted acoustic signal and two paths of same-frequency ultrasonic signals, mixing and filtering a first path of same-frequency ultrasonic signal in the two paths of same-frequency ultrasonic signals and the to-be-transmitted acoustic signal to filter out a sum frequency ultrasonic signal on which the first path of same-frequency ultrasonic signal and the to-be-transmitted acoustic signal are superimposed;
in this embodiment, the method is applied to the terminal device. The sound signal to be transmitted refers to a sound signal to be transmitted in the sound transmission task, such as a voice signal audible to human ears, a music signal, and the like, and the frequency of the sound signal is usually not a specific numerical value but a certain frequency band. The first common-frequency ultrasonic signal refers to an ultrasonic signal which is not audible to human ears and is used for mixing the sound signal to be transmitted, and the ultrasonic signal is usually generated by an ultrasonic oscillator. Mixing refers to a mixing operation for sound waves with different frequencies, and mixing refers to a process of mixing two electric signals with different frequencies by using a nonlinear element and obtaining signals with different frequencies from the original two frequencies through a frequency selection loop. Filtering refers to a process of screening a plurality of sound waves with different frequencies to screen out sound waves at a certain frequency. The sum frequency ultrasonic signal refers to a new ultrasonic signal which is generated after two rows of sound waves are mixed and has the frequency superposed with the original two frequencies.
Specifically, when receiving a voice transmission instruction sent by a user, the terminal acquires a section of audio to be transmitted currently based on the voice transmission instruction, and uses the section of audio as the voice signal to be transmitted. The terminal utilizes the ultrasonic oscillator to generate two paths of ultrasonic signals with the same frequency, and one path of ultrasonic signals is taken as a first path of ultrasonic signals randomly. The terminal mixes the audio signal with the first ultrasonic signal to obtain a new mixing signal except the original two signals, wherein the new mixing signal at least comprises a sum frequency signal obtained by superposing the frequencies of the audio signal and the first ultrasonic signal. The terminal then filters the signals of the multiple frequencies to separately filter out the sum frequency signal. Since the sum frequency signal is obtained by superimposing ultrasonic signals, the sum frequency signal also belongs to the ultrasonic signals and cannot be heard by human ears.
Step S20, positioning a target sound transmission position, and determining a first emission angle of the sum frequency ultrasonic signal and a second emission angle of a second path of common frequency ultrasonic signal in the two paths of common frequency ultrasonic signals based on the target sound transmission position, wherein the first emission angle and the second emission angle are intersected at the target sound transmission position;
in the present embodiment, the target sound transmission position refers to a destination to which a sound signal to be transmitted needs to be transmitted, and generally refers to a position of a human ear of a person to be received. The first transmission angle refers to an angle at which a sum frequency signal is transmitted; the second emission angle refers to the angle of emitting the second path of co-frequency ultrasonic signals. The first and second transmission angles may be the same or different.
The terminal firstly needs to locate a target sound transmission position to which a sound signal to be transmitted needs to be transmitted, and then the target sound transmission position is used as an intersection point of two paths of sound waves (sum frequency signals and a second path of common frequency ultrasonic signals) so as to adjust the emission angles of the two paths of sound waves. The angle of emission is relative to a reference line or plane.
For example, if the emission positions of the sum frequency signal and the second path of common-frequency ultrasonic signal are on the same vertical line, taking the emission position of the sum frequency signal as a vertex, and an acute angle formed by a line segment from the emission position of the sum frequency signal to the target sound transmission position and the vertical line is the first emission angle; and taking the emission position of the second path of co-frequency ultrasonic signals as a vertex, wherein an acute angle formed by a line segment from the emission position of the second path of co-frequency ultrasonic signals to the target sound transmission position and the vertical line is the second emission angle.
If the emission positions of the sum frequency signal and the second path of co-frequency ultrasonic signal are on the same horizontal line, taking the emission position of the sum frequency signal as a vertex, and an acute angle formed by a line segment from the emission position of the sum frequency signal to the second sound transmission position and the horizontal line is the first emission angle; and taking the emission position of the second path of co-frequency ultrasonic signals as a vertex, wherein an acute angle formed by a line segment from the emission position of the second path of co-frequency ultrasonic signals to the target sound transmission position and the horizontal line is the second emission angle.
Step S30, the sum frequency ultrasonic signal and the second channel of common frequency ultrasonic signal are transmitted simultaneously according to the first transmission angle and the second transmission angle, so as to restore the to-be-transmitted acoustic signal when the sum frequency ultrasonic signal intersects with the second channel of common frequency ultrasonic signal at the target acoustic transmission position.
In this embodiment, after determining the emission angles of the two paths of sound waves, the terminal controls the two paths of sound waves to be emitted simultaneously according to the first emission angle and the second emission angle, so that the two paths of sound waves intersect at the target sound transmission position. Due to the difference frequency characteristic of the waves, the frequency of the difference frequency signal obtained when the two paths of sound waves interact is just consistent with the sound signal to be transmitted, and therefore the method is equivalent to the reproduction of the original sound signal. And other sound wave signals existing at the target sound transmission position are all ultrasonic wave signals and cannot be heard by human ears, so that the sound wave signals which can be heard by the human ears at the target sound transmission position are only the sound signals to be transmitted.
In this embodiment, by obtaining an acoustic signal to be transmitted and two channels of common-frequency ultrasonic signals, a first channel of common-frequency ultrasonic signal in the two channels of common-frequency ultrasonic signals and the acoustic signal to be transmitted are mixed and filtered to filter out a sum-frequency ultrasonic signal on which the first channel of common-frequency ultrasonic signal and the acoustic signal to be transmitted are superimposed; positioning a target sound transmission position, and determining a first emission angle of the sum frequency ultrasonic signal and a second emission angle of a second channel of common frequency ultrasonic signals in the two channels of common frequency ultrasonic signals based on the target sound transmission position, wherein the first emission angle and the second emission angle are intersected at the target sound transmission position; and simultaneously transmitting the sum frequency ultrasonic signal and the second channel of common frequency ultrasonic signal according to the first transmitting angle and the second transmitting angle so as to restore the acoustic signal to be transmitted when the sum frequency ultrasonic signal and the second channel of common frequency ultrasonic signal intersect at the target sound transmission position. In this way, the present invention filters out the desired sum frequency ultrasonic signal by mixing the acoustic signal to be propagated with the ultrasonic wave. Then another path of common-frequency ultrasonic waves are radiated to the space at the same time, and the ultrasonic waves have strong directivity and can not be heard by human ears, so that the ultrasonic waves can be transmitted at fixed points and the privacy of the ultrasonic waves in a transmission path is ensured; by positioning the target sound transmission position and determining the emission angle according to the target sound transmission position, the intersection position of two ultrasonic waves can be controlled at the target sound transmission position, and the original voice or sound signal can be analyzed by utilizing the difference frequency and sum frequency characteristics of sound waves at the intersection, so that the fixed-point private transmission of sound is realized, and the safety of outdoor use is ensured; meanwhile, ears can be liberated, and a user does not need to additionally wear equipment such as earphones, so that the technical problem that the privacy and the comfort are difficult to be considered in the conventional sound transmission method is solved. In addition, the method also avoids the attenuation of the sound signal to be transmitted in the transmission process, and ensures the transmission integrity of the sound signal.
Further, a second embodiment of the ultrasonic-based sound transmission method of the present invention is proposed based on the first embodiment shown in fig. 2, and in this embodiment, step S30 includes:
utilizing an electroacoustic transducer to convert and focus the sum frequency ultrasonic signal and the second path of common frequency ultrasonic signal;
and simultaneously transmitting the focused sum frequency ultrasonic signal and a second path of common frequency ultrasonic signal according to the first transmitting angle and the second generating angle so as to enable the focused sum frequency ultrasonic signal and the second path of common frequency ultrasonic signal to be intersected at the target sound transmission position, wherein a difference frequency signal generated when the sum frequency ultrasonic signal is intersected with the second path of common frequency ultrasonic signal is equivalent to the sound signal to be transmitted.
Further, step S20 includes:
positioning the ear position of the receiver as the target sound transmission position;
and acquiring a first transmitting position of the sum frequency ultrasonic signal and a second transmitting position of the second path of co-frequency ultrasonic signal, and determining the first transmitting angle and the second transmitting angle by combining the first transmitting position, the second transmitting position and the ear position.
In the present embodiment, the receiver refers to a target object that needs to transmit the acoustic signal to be transmitted. The first transmission position refers to a position where a sum frequency signal is transmitted; the second transmitting position refers to the position for transmitting the second path of the same-frequency ultrasonic signals.
As shown in fig. 3, the position pointed by "Ear Location" in fig. 3 is the Ear position of the target user. The terminal needs to combine the first transmitting position, the second transmitting position and the ear position obtained by positioning, and determines a first transmitting angle and a second transmitting angle which can be the intersection of the transmitted sum frequency signal and the second path of ultrasonic signal and the target sound transmission position.
Further, the step of determining the first and second transmission angles in conjunction with the first, second and ear positions comprises:
obtaining a first transmitting path according to the first transmitting position and the ear position, and obtaining a second transmitting path according to the second transmitting position and the ear position;
and determining a transmission reference plane, so as to obtain the first transmission angle based on an included angle between the first transmission path and the transmission reference plane, and obtain the second transmission angle based on an included angle between the second transmission path and the transmission reference plane.
In the present embodiment, the first transmission path refers to a line segment from the first transmission position to the ear position, and the second transmission path refers to a line segment from the second transmission position to the ear position. The reference plane is generally taken to be a vertical plane or a horizontal plane. The first emission angle is obtained by the terminal by detecting an acute angle formed between the first emission path and the vertical reference plane or the horizontal reference plane, and the acute angle can be directly regarded as the first emission angle; the second transmission angle is obtained by the terminal by detecting an acute angle formed between the second transmission path and the vertical reference plane or the horizontal reference plane, and the acute angle can be directly regarded as the second transmission angle.
Further, the step of locating the position of the ear of the recipient comprises:
and based on an infrared or ultrasonic positioning mode, positioning the ear position of the receiver.
In this embodiment, the infrared positioning technology and the ultrasonic positioning technology are conventional technical means in the art, and the detailed positioning process is not described herein. In addition, the ear position may specifically refer to the left ear or the right ear of the recipient alone, or may refer to the left ear and the right ear. The above description is given for a single ear position, and if the ear position in actual practice is referred to as the left and right ears, the above operations may be performed simultaneously for different ears.
Furthermore, by utilizing the characteristics of strong ultrasonic directivity and the difference frequency and sum frequency of waves, two ultrasonic waves are radiated to the space at the same time, the intersection position of the two ultrasonic waves can be controlled by adjusting the emission angle, and original voice or sound signals can be analyzed at the intersection position due to the characteristics of the difference frequency and sum frequency of the sound waves.
Further, based on the first embodiment shown in fig. 2, a third embodiment of the sound transmission method based on ultrasonic waves is provided, in this embodiment, the step of mixing and filtering the first path of common-frequency ultrasonic signal in the two paths of common-frequency ultrasonic signals and the to-be-transmitted sound signal to filter out a sum frequency ultrasonic signal on which the first path of common-frequency ultrasonic signal and the to-be-transmitted sound signal are superimposed includes:
mixing a first path of common-frequency ultrasonic signal and the to-be-transmitted sound signal by using a mixer so as to mix a sum frequency ultrasonic signal and a difference frequency signal of the to-be-transmitted sound signal and the first path of common-frequency ultrasonic signal;
and filtering the acoustic signal to be transmitted, the first path of common-frequency ultrasonic signal, the sum-frequency ultrasonic signal and the difference-frequency signal by using a filter to filter out the sum-frequency ultrasonic signal.
In this embodiment, the terminal mixes the first channel of common-frequency ultrasonic signal and the to-be-transmitted acoustic signal by using a mixer to obtain a sum frequency signal and a difference frequency signal of the first channel of common-frequency ultrasonic signal and the to-be-transmitted acoustic signal, where the sum frequency signal is an ultrasonic signal. And then the terminal filters four sound wave signals existing after frequency mixing by using a filter, and separately filters out sum frequency ultrasonic signals.
Further, the step of acquiring the to-be-transmitted acoustic signal and the two paths of same-frequency ultrasonic signals includes:
acquiring an initial to-be-transmitted sound signal, and amplifying the initial to-be-transmitted sound signal by using an amplifier to obtain the to-be-transmitted sound signal;
two paths of same-frequency ultrasonic signals are sent out by an ultrasonic oscillator.
In this embodiment, when receiving a sound transmission instruction, the terminal acquires an initial to-be-transmitted sound signal from the sound transmission instruction, and then, in order to strengthen the sound signal, an amplifier is required to amplify the sound signal, and the amplified initial to-be-transmitted sound signal is used as the to-be-transmitted sound signal. Meanwhile, the terminal utilizes the ultrasonic oscillator to generate two paths of ultrasonic signals with the same frequency.
As a specific example, as shown in fig. 4.
First, the terminal sends out an Ultrasonic wave of 20K Hz through an Ultrasonic oscillator (viberator ultrasonics in the figure), and then amplifies the Acoustic Signal (which can range from 100Hz to 15K Hz, and takes Acoustic Signal 3K Hz as an example in the figure) to be transmitted through an Amplifier (Amplifier in the figure). Then, the two waves are mixed in a Mixer (Mixer in the figure), and due to the sum frequency and difference frequency characteristics of the waves, two new frequencies of waves are obtained, one is sum frequency (20K HZ + (100HZ to 15K HZ) ═ 20.1 to 35K HZ), and the other is difference frequency (20K HZ- (100HZ to 15K HZ) ═ 5 to 19.9K HZ)), and the original 20K HZ and 100HZ to 15K HZ sound waves are added, so that the waves with four frequencies (i.e., "3K HZ", "20K HZ", "17K HZ", "23K HZ" in the figure) are shared.
Then, the terminal passes through a Filter (Filter in the figure) for filtering, and only the mixed 20.1-35 KHZ ultrasonic waves are allowed to pass through (23K Hz is taken as an example in the figure). This ultrasonic wave is focused by an Electroacoustic transducer (Electroacoustic transducer in the figure) and emitted. The ultrasonic waves are very directional and easy to focus, and can be emitted like the speed of light. In the other path, a 20KHZ ultrasonic wave oscillator is used for generating a 20KHZ ultrasonic wave, and the ultrasonic wave is converted and focused by an electroacoustic transducer and then emitted. The ultrasonic waves are very directional and easy to focus, and can be emitted like the speed of light.
And finally, the terminal can transmit the two paths of sound waves at different angles by adjusting the transmitting angle. The two arrays of sound waves are made to intersect at a point remote from the ear, and the Angle (denoted as Emission Angle in the figure) is controlled to control the distance and orientation of the intersection point to be exactly at the position of the human ear. Because the two sound waves are ultrasonic waves, the sound waves cannot be heard by human ears. Even if a person is in the beam range of the two sound waves, no sound can be heard. At the intersection point of the two acoustic waves, due to the sum frequency and difference frequency characteristics of the waves, two new frequencies of waves are obtained, one is sum frequency (20KHZ + (20.1-35 KHZ) ═ 40.1-55 KHZ), and the other is difference frequency ((20.1-35 KHZ) -20KHZ) ═ 100HZ-15 KHZ)) plus the original 20KHZ and 20.1-35 KHZ acoustic waves, and there are four frequencies of waves (i.e., "43K HZ", "20K HZ", "23K HZ", "3K HZ" in the figure). Wherein, only the sound wave of 3KHZ is in the audible range, which is equivalent to the reproduction of the original sound signal and can be heard by people. The other three sound waves belong to ultrasonic waves, are out of the audible range and cannot be heard.
Further, the original acoustic signal to be transmitted is amplified, so that the original acoustic signal to be transmitted is enhanced; by mixing the acoustic signal to be transmitted with the ultrasonic waves, the desired sum frequency ultrasonic signal is filtered out, so that it is subsequently combined with the same ultrasonic signal to obtain a difference frequency signal equivalent to the acoustic signal to be transmitted.
As shown in fig. 5, the present invention also provides an ultrasonic-based sound transmission device.
The ultrasonic wave-based sound transmission device includes:
a sum frequency signal filtering module 10, configured to obtain a to-be-transmitted acoustic signal and two channels of common frequency ultrasonic signals, mix and filter a first channel of common frequency ultrasonic signals in the two channels of common frequency ultrasonic signals and the to-be-transmitted acoustic signal, so as to filter out a sum frequency ultrasonic signal on which the first channel of common frequency ultrasonic signals and the to-be-transmitted acoustic signal are superimposed;
the emission angle determining module 20 is configured to locate a target sound transmission position, and determine a first emission angle of the sum frequency ultrasonic signal and a second emission angle of a second channel of common frequency ultrasonic signals in the two channels of common frequency ultrasonic signals based on the target sound transmission position, where the first emission angle and the second emission angle intersect at the target sound transmission position;
the to-be-transmitted sound wave restoring module 30 is configured to simultaneously transmit the sum frequency ultrasonic signal and the second channel of common frequency ultrasonic signal according to the first transmission angle and the second transmission angle, so as to restore the to-be-transmitted sound signal when the sum frequency ultrasonic signal and the second channel of common frequency ultrasonic signal intersect at the target sound transmission position.
The invention also provides a sound transmission device based on the ultrasonic wave.
The ultrasonic wave-based sound transmission device comprises a processor, a memory and an ultrasonic wave-based sound transmission program which is stored on the memory and can run on the processor, wherein when the ultrasonic wave-based sound transmission program is executed by the processor, the steps of the ultrasonic wave-based sound transmission method are realized.
The method implemented when the sound transmission program based on ultrasonic wave is executed may refer to each embodiment of the sound transmission method based on ultrasonic wave of the present invention, and details are not repeated here.
The invention also provides a computer readable storage medium.
The computer-readable storage medium of the present invention stores thereon an ultrasonic-based acoustic transmission program that realizes the steps of the ultrasonic-based acoustic transmission method as described above when executed by a processor.
The method implemented when the sound transmission program based on ultrasonic wave is executed may refer to each embodiment of the sound transmission method based on ultrasonic wave of the present invention, and details are not repeated here.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on this understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for causing an ultrasound-based sound transmission apparatus to perform the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An ultrasonic-based sound transmission method, characterized by comprising:
acquiring a to-be-transmitted acoustic signal and two paths of same-frequency ultrasonic signals, mixing and filtering a first path of same-frequency ultrasonic signal in the two paths of same-frequency ultrasonic signals and the to-be-transmitted acoustic signal to filter out a sum frequency ultrasonic signal on which the first path of same-frequency ultrasonic signal and the to-be-transmitted acoustic signal are superposed;
positioning a target sound transmission position, and determining a first emission angle of the sum frequency ultrasonic signal and a second emission angle of a second channel of common frequency ultrasonic signals in the two channels of common frequency ultrasonic signals based on the target sound transmission position, wherein the first emission angle and the second emission angle are intersected at the target sound transmission position;
and simultaneously transmitting the sum frequency ultrasonic signal and the second channel of common frequency ultrasonic signal according to the first transmitting angle and the second transmitting angle so as to restore the acoustic signal to be transmitted when the sum frequency ultrasonic signal and the second channel of common frequency ultrasonic signal intersect at the target sound transmission position.
2. The ultrasound-based sound transmission method according to claim 1, wherein the step of simultaneously transmitting the sum frequency ultrasound signal and the second channel of common-frequency ultrasound signals according to the first transmission angle and the second transmission angle to recover the sound signal to be transmitted when the sum frequency ultrasound signals intersect with the second channel of common-frequency ultrasound signals at the target sound transmission position comprises:
utilizing an electroacoustic transducer to convert and focus the sum frequency ultrasonic signal and the second path of common frequency ultrasonic signal;
and simultaneously transmitting the focused sum frequency ultrasonic signal and a second path of common frequency ultrasonic signal according to the first transmitting angle and the second generating angle so as to enable the focused sum frequency ultrasonic signal and the second path of common frequency ultrasonic signal to be intersected at the target sound transmission position, wherein a difference frequency signal generated when the sum frequency ultrasonic signal is intersected with the second path of common frequency ultrasonic signal is equivalent to the sound signal to be transmitted.
3. The ultrasound-based sound transmission method according to claim 1, wherein the step of locating a target sound transmission position, determining a first emission angle of the sum frequency ultrasound signal and a second emission angle of a second one of the two same frequency ultrasound signals based on the target sound transmission position comprises:
positioning the ear position of the receiver as the target sound transmission position;
and acquiring a first transmitting position of the sum frequency ultrasonic signal and a second transmitting position of the second path of co-frequency ultrasonic signal, and determining the first transmitting angle and the second transmitting angle by combining the first transmitting position, the second transmitting position and the ear position.
4. The ultrasound-based acoustic transmission method of claim 3, wherein the step of determining the first and second transmission angles in combination with the first transmission location, the second transmission location, and the ear location comprises:
obtaining a first transmitting path according to the first transmitting position and the ear position, and obtaining a second transmitting path according to the second transmitting position and the ear position;
and determining a transmission reference plane, so as to obtain the first transmission angle based on an included angle between the first transmission path and the transmission reference plane, and obtain the second transmission angle based on an included angle between the second transmission path and the transmission reference plane.
5. The ultrasound-based acoustic transmission method of claim 3, wherein the step of locating the ear position of the recipient comprises:
and based on an infrared or ultrasonic positioning mode, positioning the ear position of the receiver.
6. The ultrasound-based sound transmission method according to claim 1, wherein the step of mixing and filtering a first co-frequency ultrasound signal of the two co-frequency ultrasound signals with the to-be-transmitted sound signal to filter out a sum frequency ultrasound signal on which the first co-frequency ultrasound signal and the to-be-transmitted sound signal are superimposed includes:
mixing a first path of common-frequency ultrasonic signal and the to-be-transmitted sound signal by using a mixer so as to mix a sum frequency ultrasonic signal and a difference frequency signal of the to-be-transmitted sound signal and the first path of common-frequency ultrasonic signal;
and filtering the acoustic signal to be transmitted, the first path of common-frequency ultrasonic signal, the sum-frequency ultrasonic signal and the difference-frequency signal by using a filter to filter out the sum-frequency ultrasonic signal.
7. The ultrasound-based acoustic transmission method according to any one of claims 1 to 6, wherein the step of obtaining the acoustic signal to be transmitted and the two co-frequency ultrasound signals comprises:
acquiring an initial to-be-transmitted sound signal, and amplifying the initial to-be-transmitted sound signal by using an amplifier to obtain the to-be-transmitted sound signal;
two paths of same-frequency ultrasonic signals are sent out by an ultrasonic oscillator.
8. An ultrasonic-based sound transmission device, characterized by comprising:
the sum frequency signal filtering module is used for acquiring a to-be-transmitted acoustic signal and two paths of same frequency ultrasonic signals, mixing and filtering a first path of same frequency ultrasonic signal in the two paths of same frequency ultrasonic signals with the to-be-transmitted acoustic signal, and filtering out a sum frequency ultrasonic signal on which the first path of same frequency ultrasonic signal and the to-be-transmitted acoustic signal are superposed;
the transmitting angle determining module is used for positioning a target sound transmission position, and determining a first transmitting angle of the sum frequency ultrasonic signal and a second transmitting angle of a second channel of common frequency ultrasonic signal in the two channels of common frequency ultrasonic signals based on the target sound transmission position, wherein the first transmitting angle and the second transmitting angle are intersected at the target sound transmission position;
and the to-be-transmitted sound wave restoration module is used for simultaneously transmitting the sum frequency ultrasonic signal and the second channel of common frequency ultrasonic signal according to the first transmission angle and the second transmission angle so as to restore the to-be-transmitted sound signal when the sum frequency ultrasonic signal and the second channel of common frequency ultrasonic signal intersect at the target sound transmission position.
9. An ultrasonic-based sound transmission apparatus, characterized in that it comprises: a memory, a processor and an ultrasound-based acoustic program stored on the memory and executable on the processor, the ultrasound-based acoustic program, when executed by the processor, implementing the steps of the ultrasound-based acoustic method according to any one of claims 1 to 7.
10. A computer-readable storage medium, in which an ultrasound-based sound transmission program is stored, which, when executed by a processor, implements the steps of the ultrasound-based sound transmission method according to any one of claims 1 to 7.
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