CN113098628A - Structural sound field communication method and system - Google Patents
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Abstract
The invention discloses a structural sound field communication method and system, and belongs to the field of sound field communication. The method utilizes an array sound source to generate structural sound field coding information which changes along with time, and utilizes an array sound field receiver to detect structural sound field decoding information which changes along with time after transmission, thereby realizing structural sound field communication. The system comprises a signal source, a transmitting end programmable control panel, a digital-to-analog conversion module array, an electroacoustic converter array, a transmission medium, an acoustoelectric converter array, an amplification module array, an analog-to-digital conversion module array, a receiving end programmable control panel and a signal processor, and realizes the transmission, transmission and detection of a structural sound field changing along with time. The invention breaks through the limitation that the traditional sound field communication is mainly based on the Gaussian sound field, provides a new way for sustainable capacity expansion of the sound field communication by introducing the structural sound field, effectively improves the flexibility of receiving and transmitting the structural sound field by the array sound source and the array sound field receiver, and has wide application prospect in the aspect of high-speed large-capacity intelligent sound field communication.
Description
Technical Field
The invention belongs to the field of sound field communication, and particularly relates to a structural sound field communication method and system.
Background
The 21 st century has entered the information age and the network age. Terrestrial communications have changed from cable to cable, from analog to digital, from wired to wireless networks, and from 1G to 5G today, with ever-upgraded communication network approaches linking the world tightly. The communication technology changes the production and living modes of people from industries such as network shopping, research and development of 5G mobile phones, intelligent home interconnection and the like in daily life to the fields such as medical treatment, military affairs and the like. However, abundant natural resources are contained in vast oceans, efficient and reliable exploration and communication are difficult to realize, and the development of oceans in the world is obviously lagged behind land communication at present. With the frequent and rapid development of global marine activities, the development of modern marine communication networks and technologies has become a focus problem in the academic and industrial fields of China. Electromagnetic waves and light waves are transmitted underwater, and the transmission distance is limited to a short distance (not more than 200m) due to various influences of attenuation, scattering and absorption. In contrast, the sound field is currently the only way to transmit information underwater over long distances. The transmission characteristics of the sound field in air are similar to those of the sound field in water, so that some sound field communication researches are also carried out in air.
It is worth noting that the traditional sound field communication mode mainly uses a gaussian sound field, and due to the fact that the traditional sound field communication mode is limited by a single gaussian sound field and the sound field frequency is very low, the sound field communication capacity is limited, and the increasing underwater data communication requirements cannot be met more and more. The Gaussian light field corresponds to the Gaussian sound field, in the field of optical communication, except the Gaussian light field, in recent years, more and more attention is paid to a vortex light field, a vector light field and a structural light field which fully utilize the dimension of a light wave space, and because the novel dimension of the light wave space is utilized, the capacity bottleneck of the prior art of optical communication can be broken through. Compared with the similar sound field, in the field of acoustic communication, by utilizing the new dimension of the sound field space, a vortex sound field (spiral phase distribution) and a structural sound field (space change amplitude and phase distribution) are introduced into the acoustic communication, and a new way for sustainable capacity expansion of the acoustic communication is hopefully provided. In the past, there are few reports on sound fields with generalized structures for acoustic communication, and meanwhile, a method generally adopted in sound field receiving is to receive a sound field at a certain specific position by using a single microphone and then obtain the sound field by scanning the whole plane space. In order to realize the structural sound field communication more flexibly and efficiently, efficient generation and detection of the structural sound field at the transmitting end and the receiving end are required to be realized at the same time, but at present, the research on the aspect is less. In view of this, the method and the system for flexible and efficient structural sound field communication are provided, and have great significance for sustainable capacity-expansion sound communication development in the future.
Disclosure of Invention
Aiming at the defects of the existing acoustic communication technology, the invention provides a structural sound field communication method and a structural sound field communication system, aiming at providing a flexible and efficient transmitting and receiving method of a generalized structural sound field (with space variation amplitude and phase distribution) and constructing a corresponding structural sound field communication system, realizing the generation, transmission and detection of a structural sound field varying along with time, further realizing the structural sound field communication and filling the blank of the related technology.
In order to achieve the above object, according to an aspect of the present invention, a structural sound field communication method is provided, in which an array sound source is used at a transmitting end to generate a structural sound field, each array unit of the array sound source can independently adjust and control the amplitude and phase of the transmitted sound field, so as to obtain a structural sound field with spatially varying amplitude and phase distribution, and different structural sound fields can be generated at different times by controlling the array sound source to encode information; transmitting the structural sound field of the transmitting end changing along with the time to the receiving end; and detecting the structural sound field by using an array sound field receiver at a receiving end, wherein the array sound field receiver can detect the amplitude and the phase of the sound field at the position of each array unit, so that the structural sound field changing along with time is restored to decode information. And generating structural sound field coding information changing along with time by using the array sound source, and detecting structural sound field decoding information changing along with time by using the array sound field receiver, thereby realizing structural sound field communication.
Preferably, the array sound source can be a ring array, a square array or other geometrically arranged arrays, each array unit is driven by a simulated sine signal, the frequency of the array unit corresponds to the frequency of a sound field, and the amplitude and the phase of each array unit can be regulated and controlled freely and independently. Through electroacoustic conversion, an array sound source generates a time-varying structural sound field which carries different encoded information, and when 2N time-varying structural sound fields are generated, an N-bit binary information (N is a positive integer) can be encoded.
Preferably, the array sound field receiver may be an annular array, a square array, or other geometrically arranged arrays, each array sound field receiver detects amplitude and phase information of a sound field at a position where the array sound field receiver is located, through acoustoelectric conversion, the array sound field receiver recovers a structural sound field changing with time, the structural sound field carries different decoding information, and when 2N structural sound fields changing with time are detected, N-bit binary information (N is a positive integer) corresponding to the transmitting end can be decoded.
According to another aspect of the present invention, there is provided a structured sound field communication system comprising: the device comprises a signal source, a transmitting end programmable control panel, a digital-to-analog conversion module array, an electroacoustic converter array, a transmission medium, an acoustoelectric converter array, an amplification module array, an analog-to-digital conversion module array, a receiving end programmable control panel and a signal processor. The signal source is combined with the programmable control panel at the transmitting end to generate a plurality of digital sine wave signals with randomly and independently adjustable amplitudes and phases, the digital-to-analog conversion module array converts the plurality of digital sine wave signals into a plurality of analog sine signals with randomly and independently adjustable amplitudes and phases, each analog sine signal can regulate and control the amplitude and the phase of a sound field generated by an electroacoustic converter driven by the analog sine signal, the electroacoustic converter array generates a structural sound field with spatially variable amplitudes and phases under the driving of the plurality of analog sine signals, the signal source, the programmable control panel at the transmitting end, the digital-to-analog conversion module array and the electroacoustic converter array generate different structural sound fields at different times to realize information coding, the sound field of the structure is detected by the electroacoustic converter array to obtain a plurality of analog electric signals after the structural sound field changing along with the time is transmitted by a complex medium, and, the analog-to-digital conversion module array converts a plurality of analog electric signals into a plurality of digital signals, the receiving end programmable control panel collects the plurality of digital signals, the signal processor analyzes and processes the collected plurality of digital signals to restore the plurality of analog electric signals and finally recover a structural sound field changing along with time to decode information, and therefore structural sound field communication is achieved.
Preferably, the programmable control board at the transmitting end is a plurality of integrated circuit logic arrays, which can be a core board of a logic gate circuit (FPGA, STM circuit, etc.) and an expansion board circuit thereof, and realizes synchronous output of digital signals by sharing one clock circuit. Logic gate development software programs control the logic gates to generate a plurality of sinusoidal digital signals. The digital-to-analog conversion module array comprises a plurality of digital-to-analog conversion chips and a peripheral control circuit, wherein the peripheral control circuit is generally a double operational amplifier circuit, a first operational amplifier circuit converts a differential analog signal into a single-ended analog signal for output, and a second operational amplifier circuit adopts a power amplifier to improve the driving capability. The phase of each path of sinusoidal signal can be independently controlled through logic gate circuit development software, and the dual-operation amplifying circuit can realize independent regulation and control of the amplitude of the sinusoidal signal through a regulation and control potentiometer, so that an analog sinusoidal signal with the amplitude and the phase being independently adjustable at will can be generated.
Preferably, the electroacoustic transducer array is generally a speaker array, which converts an analog sinusoidal electrical signal into an acoustic signal (i.e., sound field), where the frequency of the electrical signal corresponds to the frequency of the sound field, and the array may be a circular array, a square array, or other geometrically arranged arrays. The transmission medium can be air, underwater or other sound field transmission media.
Preferably, the sound-electricity converter array is generally a microphone array, which converts a sound signal (i.e. sound field) into an analog sinusoidal electric signal, the frequency of the sound field corresponds to the frequency of the electric signal, and the array may be a circular array, a square array, or other geometric arrangement array.
Preferably, the amplifying module array is used for amplifying the weak analog signals received by the acoustic-electric converter array, and comprises a low-noise pre-amplifying circuit, a variable gain amplifying circuit and an automatic gain control circuit.
Preferably, the analog-to-digital conversion module array converts the analog signal into a sine wave digital signal, and comprises an analog-to-digital conversion chip and a peripheral control circuit thereof. The programmable control board at the receiving end is a plurality of integrated circuit logic arrays, can be a logic gate circuit (FPGA, STM circuit, etc.) core board and an expansion board circuit thereof, and realizes synchronous acquisition of a plurality of digital signals output by the analog-to-digital conversion module array by sharing one clock circuit.
Preferably, the signal processor may be a computer or other microprocessors in combination with programmable software and data processing software, the programmable software controls the receiving end programmable control board to collect digital signals onto the computer (or other microprocessors), and the data processing software is combined to recover amplitude and phase information of analog signals received by each of the acoustic-electric converters (microphones), so as to detect structural sound field information of the position where the acoustic-electric converter array (microphone array) is located. At a transmitting end, each unit of the array sound source can independently regulate and control the amplitude and the phase of a sound field transmitted by the unit, so that a structural sound field can be generated, the structural sound field changing along with time reaches a receiving end after being transmitted for a period of time, and an array sound field receiver can recover the amplitude and the phase of the sound field at the position of each unit, so that sound field information changing along with time can be recovered at the receiving end. Information can be coded by utilizing a structural sound field which changes along with time, and the structural sound field carrying the coded information is recovered in real time through an array sound field receiver at a receiving end after being transmitted for a period of time, so that the real-time transmission and receiving of structural sound field communication are realized.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the invention discloses a structural sound field communication method and a structural sound field communication system, which utilize new dimensional resources of a light wave space, particularly fully utilize the dimensional resources of the amplitude and the phase of the light wave space, have generality compared with a traditional Gaussian sound field and a recent vortex sound field, and provide a brand new idea for sustainable capacity expansion of sound communication.
2. The invention utilizes the structural sound field to carry out communication, and because the structural sound field theoretically has infinite values, the structural sound field can have a plurality of values even in practical application, so that the structural sound field communication can effectively improve the sound communication efficiency, such as bit number information transmitted by unit code elements.
3. The invention realizes communication by utilizing the array sound source and the array sound field receiver to generate and detect the structural sound field which changes along with time, the array generation and detection mode of the structural sound field is efficient and has expandability, especially, the array detection mode can effectively reduce the receiving processing delay and is beneficial to realizing the real-time structural sound field communication.
4. The invention realizes communication by utilizing the structural sound field coding and decoding information, the communication speed is directly related to the response time of the array sound source and the array sound field receiver, and the high-speed structural sound field coding and decoding can be realized by using the high-speed integrated circuit logic array, thereby realizing the high-speed structural sound field communication.
5. The method has universality by utilizing the idea of realizing the structure sound field communication by array transmitting and receiving, and can be also suitable for the structure light field communication and even the structure electromagnetic field communication in the general sense.
Drawings
FIG. 1 is a schematic diagram of a structural sound field communication method provided by the invention.
Fig. 2 is a schematic structural diagram of a structural sound field communication system provided by the present invention.
Fig. 3 is a schematic diagram of a structural sound field communication array sound source device provided by an embodiment of the invention.
Fig. 4 is a schematic diagram of a structural sound field communication array sound field receiver device provided by an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a structural sound field communication method, which is characterized in that a structural sound field is generated by utilizing an array sound source at a transmitting end, the amplitude and the phase of the transmitted sound field can be freely and independently regulated and controlled by each array unit of the array sound source, so that the structural sound field with space variation amplitude and phase distribution is obtained, and different structural sound fields can be generated at different time by controlling the array sound source to encode information; transmitting the structural sound field of the transmitting end changing along with the time to the receiving end; and detecting the structural sound field by using an array sound field receiver at a receiving end, wherein the array sound field receiver can detect the amplitude and the phase of the sound field at the position of each array unit, so that the structural sound field changing along with time is restored to decode information. And generating structural sound field coding information changing along with time by using the array sound source, and detecting structural sound field decoding information changing along with time by using the array sound field receiver, thereby realizing structural sound field communication.
Specifically, the array sound source may be an annular array, a square array, or other geometrically arranged arrays, each array unit is driven by a simulated sinusoidal signal, the frequency of the array unit corresponds to the frequency of a sound field, and the amplitude and phase of each array unit can be independently regulated and controlled at will. By electroacoustic conversion, the array sound source generates a time-varying structural sound field carrying different encoded information when generating 2NWhen the structural sound field changes along with time, N bits of binary information (N is a positive integer) can be coded.
Specifically, the array sound field receiver may be an annular array, a square array, or other geometrically arranged arrays, each array sound field receiver detects amplitude and phase information of a sound field at a position where the array sound field receiver is located, through acousto-electric conversion, the array sound field receiver recovers a structural sound field changing with time, the structural sound field carries different decoding information, and when 2, the array sound field receiver detects that the structural sound field changes with timeNWhen the structural sound field changes along with time, N-bit binary information (N is a positive integer) corresponding to a transmitting end can be decoded.
The invention also provides a structural sound field communication system, comprising: the device comprises a signal source, a transmitting end programmable control panel, a digital-to-analog conversion module array, an electroacoustic converter array, a transmission medium, an acoustoelectric converter array, an amplification module array, an analog-to-digital conversion module array, a receiving end programmable control panel and a signal processor. The signal source is combined with the programmable control panel at the transmitting end to generate a plurality of digital sine wave signals with randomly and independently adjustable amplitudes and phases, the digital-to-analog conversion module array converts the plurality of digital sine wave signals into a plurality of analog sine signals with randomly and independently adjustable amplitudes and phases, each analog sine signal can regulate and control the amplitude and the phase of a sound field generated by an electroacoustic converter driven by the analog sine signal, the electroacoustic converter array generates a structural sound field with spatially variable amplitudes and phases under the driving of the plurality of analog sine signals, the signal source, the programmable control panel at the transmitting end, the digital-to-analog conversion module array and the electroacoustic converter array generate different structural sound fields at different times to realize information coding, the sound field of the structure is detected by the electroacoustic converter array to obtain a plurality of analog electric signals after the structural sound field changing along with the time is transmitted by a complex medium, and, the analog-to-digital conversion module array converts a plurality of analog electric signals into a plurality of digital signals, the receiving end programmable control panel collects the plurality of digital signals, the signal processor analyzes and processes the collected plurality of digital signals to restore the plurality of analog electric signals and finally recover a structural sound field changing along with time to decode information, and therefore structural sound field communication is achieved.
Specifically, the programmable control board at the transmitting end is a plurality of integrated circuit logic arrays, which can be a core board of a logic gate circuit (FPGA, STM circuit, etc.) and an expansion board circuit thereof, and realizes synchronous output of digital signals by sharing one clock circuit. Logic gate development software programs control the logic gates to generate a plurality of sinusoidal digital signals. The digital-to-analog conversion module array comprises a plurality of digital-to-analog conversion chips and a peripheral control circuit, wherein the peripheral control circuit is generally a double operational amplifier circuit, a first operational amplifier circuit converts a differential analog signal into a single-ended analog signal for output, and a second operational amplifier circuit adopts a power amplifier to improve the driving capability. The phase of each path of sinusoidal signal can be independently controlled through logic gate circuit development software, and the dual-operation amplifying circuit can realize independent regulation and control of the amplitude of the sinusoidal signal through a regulation and control potentiometer, so that an analog sinusoidal signal with the amplitude and the phase being independently adjustable at will can be generated.
Specifically, the electroacoustic transducer array is generally a speaker array, which converts an analog sinusoidal electrical signal into an acoustic signal (i.e., a sound field), where the frequency of the electrical signal corresponds to the frequency of the sound field, and the array may be a circular array, a square array, or other geometrically arranged arrays. The transmission medium can be air, underwater or other sound field transmission media.
Specifically, the acoustic-electric converter array is generally a microphone array, which converts an acoustic signal (i.e., a sound field) into an analog sinusoidal electrical signal, where the sound field frequency corresponds to the electrical signal frequency, and the array may be a circular array, a square array, or other geometrically arranged arrays.
Specifically, the amplification module array is used for amplifying a weak analog signal received by the acoustic-electric converter array and comprises a low-noise pre-amplification circuit, a variable gain amplification circuit and an automatic gain control circuit.
Specifically, the analog-to-digital conversion module array converts an analog signal into a sine wave digital signal, and comprises an analog-to-digital conversion chip and a peripheral control circuit thereof. The programmable control board at the receiving end is a plurality of integrated circuit logic arrays, can be a logic gate circuit (FPGA, STM circuit, etc.) core board and an expansion board circuit thereof, and realizes synchronous acquisition of a plurality of digital signals output by the analog-to-digital conversion module array by sharing one clock circuit.
Specifically, the signal processor may be a computer or other microprocessors in combination with programmable software and data processing software, the programmable software controls the receiving end programmable control board to collect digital signals to the computer (or other microprocessors), and the data processing software recovers amplitude and phase information of analog signals received by each of the acoustic-electric converters (microphones) so as to detect structural sound field information of the positions where the acoustic-electric converter arrays (microphone arrays) are located. At a transmitting end, each unit of the array sound source can independently regulate and control the amplitude and the phase of a sound field transmitted by the unit, so that a structural sound field can be generated, the structural sound field changing along with time reaches a receiving end after being transmitted for a period of time, and an array sound field receiver can recover the amplitude and the phase of the sound field at the position of each unit, so that sound field information changing along with time can be recovered at the receiving end. Information can be coded by utilizing a structural sound field which changes along with time, and the structural sound field carrying the coded information is recovered in real time through an array sound field receiver at a receiving end after being transmitted for a period of time, so that the real-time transmission and receiving of structural sound field communication are realized.
The following description is made with reference to the embodiments and the accompanying drawings.
As shown in fig. 1, which is a schematic diagram of a structural sound field communication method provided by the present invention, an array sound source is used at a transmitting end to generate a structural sound field, each array unit of the array sound source can independently regulate and control the amplitude and phase of the transmitted sound field, so as to obtain a structural sound field with spatially varying amplitude and phase distribution, and different structural sound fields can be generated at different times by controlling the array sound source to encode information; transmitting the structural sound field of the transmitting end changing along with the time to the receiving end; and detecting the structural sound field by using an array sound field receiver at a receiving end, wherein the array sound field receiver can detect the amplitude and the phase of the sound field at the position of each array unit, so that the structural sound field changing along with time is restored to decode information. And generating structural sound field coding information changing along with time by using the array sound source, and detecting structural sound field decoding information changing along with time by using the array sound field receiver, thereby realizing structural sound field communication.
Fig. 2 is a schematic structural diagram of a structural sound field communication system provided by the present invention. The method comprises the following steps: the device comprises a signal source 1, a transmitting end programmable control board 2, a digital-to-analog conversion circuit module 3, an electroacoustic converter array 4, a transmission medium 5, an acoustoelectric converter array 6, an amplification module array 7, an analog-to-digital conversion module array 8, a receiving end programmable control board 9 and a signal processor 10. The signal source 1 is combined with the programmable control panel 2 at the transmitting end to generate sine wave digital signals with adjustable phases, the digital-to-analog conversion module array 3 converts the digital signals into analog sine signals, the electroacoustic converter array 4 converts the analog signals into sound field signals, the transmission medium 5 is the propagation environment of the sound field signals, the electroacoustic converter array 6 receives the sound field signals and converts the sound field signals into analog electric signals, the amplification module array 7 is used for amplifying weak analog signals received by a microphone, the analog-to-digital conversion module array 8 converts the analog signals into the digital signals, the programmable control panel 9 at the receiving end collects the signals, and the signal processor 10 processes the collected data and restores the sound field information.
Fig. 3 is a schematic diagram of a sound source device of a structural sound field communication array according to the present invention. The device comprises a signal source 1, a transmitting end programmable control board 2, a digital-to-analog conversion module array 3 and an electroacoustic converter array 4. The signal source 1 is generally a computer, the programmable control board 2 is generally a plurality of logic gate circuit expansion boards, including a logic gate circuit 21, a power supply circuit 22, a reset circuit 23, a configuration/download interface 24 and an expansion board interface 25, and the extension I/O that the logic gate circuit can be drawn out is limited, so a plurality of logic gate circuit development boards are required. The clocks on each logic gate circuit development board have slight difference, a method of sharing the same clock circuit 26 is adopted to generate multiple paths of synchronous sine wave digital signals, and logic gate circuit development software is combined to control the logic gate circuits to output sine wave digital signal phases at different moments. The digital-to-analog conversion module array 3 comprises a digital-to-analog conversion chip, a peripheral control circuit 31 of the digital-to-analog conversion chip and a double operational amplifier circuit 32, wherein the digital-to-analog conversion chip adopts a high-speed and 8-bit DAC chip and outputs two paths of differential sinusoidal analog signals, the first operational amplifier circuit of the double operational amplifier circuit converts the differential analog signals into single-ended analog signals to be output, the second operational amplifier circuit adopts a power amplifier to improve the driving capability, and the double operational amplifier circuit can realize independent regulation and control of the amplitude of the sinusoidal signals through a regulation potentiometer. Through the design, a plurality of groups of analog sinusoidal signals with time-varying and independently adjustable amplitude and phase can be generated. A plurality of sinusoidal signals are connected with an electroacoustic transducer array 4 one by one, generally a loudspeaker array, analog signals are converted into sound field signals, the array can be annular or square, and the number, the size and the interval of the array are set by combining simulation software. The sound field signals emitted by the loudspeaker array carry amplitude phase information of the analog sinusoidal signals, and a sound field with any structure changing along with time is formed.
Fig. 4 is a schematic diagram of a structural sound field communication array sound field receiver apparatus according to the present invention. The device comprises an acoustic-electric converter array 6, an amplification module array 7, an analog-digital conversion module array 8, a receiving end programmable control board 9 and a signal processor 10. The sound-electricity converter array is generally a microphone array, converts received sound field signals into analog signals, is generally a square array, represents a receiving plane, and combines with simulation to calculate the size of the array, so that the received sound field information is incomplete due to too small size, and the detection resolution is reduced due to too large size, thereby reducing the sound field recovery accuracy. After the sound field signals received by the microphone are converted into analog signals, the signal intensity is weak, and the signals can be identified only after being filtered and amplified. The amplification module array 7 includes a low-noise pre-amplification circuit 71, a variable gain amplification circuit 72, and an automatic gain control circuit 73, and amplifies weak analog signals to several hundred millivolts or more as the input of the analog-to-digital conversion module array 8. The analog-to-digital conversion module comprises a high-speed and high-sampling rate analog-to-digital conversion chip ADC and a peripheral control circuit 81 thereof, and a voltage conversion circuit module 82, and converts an analog signal into a digital signal for output. The receiving-end programmable control board 9 is generally a plurality of logic gate circuit development boards, including a logic gate circuit 91, a power supply circuit 92, a reset circuit 93, a configuration/download interface 94 and an expansion board interface 95, where the number of expansion I/O ports that can be drawn by the logic gate circuit is limited, and 1I/O port collects one digital signal, so that a plurality of logic gate circuit development boards are required. The clocks on each logic gate circuit development board have slight difference, a common clock circuit is adopted to generate multiple paths of synchronous sine wave digital signals, and the logic gate circuit development software is combined to control the logic gate circuit to acquire the digital signals output by the digital-to-analog conversion chip. The signal processor 10 restores the digital signals acquired by the logic gate circuit development software into analog signals, and calculates the amplitude and phase information of the analog signals, thereby restoring sound field information of a plane where the microphone array is located at different moments and decoding information carried by incident signals.
The present invention is not limited to the above embodiments, and those skilled in the art can implement the present invention in other various embodiments according to the disclosure of the present invention, so that all designs and concepts of the present invention can be changed or modified without departing from the scope of the present invention.
Claims (10)
1. A structural sound field communication method is characterized in that,
generating a structural sound field with spatially-varying amplitude and phase distribution by using an array sound source at a transmitting end, wherein each transmitting array unit of the array sound source can independently regulate and control the amplitude and phase of the transmitted sound field at will, and is used for generating different structural sound fields at different times to encode information;
and detecting the amplitude and the phase of the structural sound field at the position of each receiving array unit by using an array sound field receiver at a receiving end, and recovering the structural sound field changing along with time to decode information, thereby realizing structural sound field communication.
2. The method according to claim 1, wherein the array sound source is a circular array or a square array, each emitting array unit is driven by an analog sine signal, and the frequency of each emitting array unit corresponds to the sound field frequency; by electroacoustic conversion, the array sound source generates a time-varying structural sound field carrying different encoded information when generating 2NAnd when the structural sound field changes along with time, encoding N-bit binary information, wherein N is a positive integer.
3. The method of claim 2, wherein the array sound field receiver is a circular array or a square array, each receiving array unit detects the amplitude and phase information of the sound field at the position, the array sound field receiver recovers a structural sound field changing with time through acoustoelectric conversion, and the structural sound field carries different decoding information when 2. the array sound field receiver detects the amplitude and phase information of the sound field at the position, and when the array sound field receiver detects the amplitude and phase information, the array sound field receiver recovers the structural sound field and theNAnd when the structural sound field changes along with time, decoding N-bit binary information corresponding to the transmitting terminal, wherein N is a positive integer.
4. A structure sound field communication system is characterized by comprising a signal source, a transmitting end programmable control panel, a digital-to-analog conversion module array, an electroacoustic converter array, a transmission medium, an acoustoelectric converter array, an amplification module array, an analog-to-digital conversion module array, a receiving end programmable control panel and a signal processor which are sequentially connected; the signal source is used for combining with the transmitting end programmable control panel to generate a plurality of digital sine wave signals with randomly and independently adjustable amplitudes and phases, the digital-to-analog conversion module array is used for converting the plurality of digital sine wave signals into a plurality of analog sine signals with randomly and independently adjustable amplitudes and phases, each analog sine signal is used for regulating and controlling the amplitude and the phase of a sound field generated by an electroacoustic converter driven by the analog sine module array, the electroacoustic converter array is used for generating a structural sound field with spatially-changed amplitudes and phases under the driving of the plurality of analog sine signals, the signal source, the transmitting end programmable control panel, the digital-to-analog conversion module array and the electroacoustic converter array generate different structural sound fields at different times to realize information coding, the transmission medium is used for transmitting the structural sound field changing along with time, and the acousto-electric converter array is used for detecting the structural sound, the amplification module array is used for amplifying a plurality of analog electric signals, the analog-to-digital conversion module array is used for converting the amplified analog electric signals into a plurality of digital signals, the receiving end programmable control panel is used for collecting the digital signals, and the signal processor is used for analyzing and processing the collected digital signals to restore the analog electric signals and finally restoring a structural sound field changing along with time to decode information, so that structural sound field communication is realized.
5. The system of claim 4, wherein the programmable control board at the transmitting end is a plurality of integrated circuit logic arrays, and the synchronous output of sinusoidal digital signals is realized by sharing one clock circuit, and the amplitude and the phase of the sinusoidal digital signals are independently adjustable; the digital-to-analog conversion module array comprises a plurality of digital-to-analog conversion chips and a peripheral control circuit, wherein the peripheral control circuit is a double operational amplifier circuit, the first operational amplifier circuit is used for converting differential analog signals into single-ended analog signals to be output, and the second operational amplifier circuit is used for improving the driving capability by adopting a power amplifier.
6. The system of claim 4, wherein said array of electro-acoustic transducers is an array of circular or square loudspeakers that convert analog sinusoidal electrical signals into sound signals, the frequencies of the electrical signals corresponding to the frequencies of the sound field.
7. The system of claim 4, wherein the acousto-electric converter array is a ring or square microphone array that converts sound signals into analog sinusoidal electrical signals, the sound field frequencies corresponding to the electrical signal frequencies.
8. The system of claim 4, wherein the amplifying module array is configured to amplify the analog signals received by the acousto-electric transducer array, and comprises a low-noise pre-amplifying circuit, a variable gain amplifying circuit, and an automatic gain control circuit, which are connected in sequence.
9. The system of claim 4, wherein the analog-to-digital conversion module array converts an analog signal into a sine wave digital signal, and comprises an analog-to-digital conversion chip and a peripheral control circuit thereof; the receiving end programmable control board is a plurality of integrated circuit logic arrays, and a plurality of digital signals output by the analog-to-digital conversion module array are synchronously acquired by sharing one clock circuit.
10. The system according to claim 4, wherein the signal processor is a computer or other microprocessor, and combines a programmable software and a data processing software, the programmable software controls the receiving end programmable control board to collect digital signals to the computer or other microprocessor, and combines the data processing software to recover amplitude and phase information of each sound-electricity converter receiving analog signals, so as to detect structural sound field information of the position where the sound-electricity converter array is located.
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