CN114760562A - Digital sound reconstruction method, equipment, storage medium and digital loudspeaker - Google Patents

Digital sound reconstruction method, equipment, storage medium and digital loudspeaker Download PDF

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Publication number
CN114760562A
CN114760562A CN202210389776.1A CN202210389776A CN114760562A CN 114760562 A CN114760562 A CN 114760562A CN 202210389776 A CN202210389776 A CN 202210389776A CN 114760562 A CN114760562 A CN 114760562A
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control ports
element array
elements
transducing elements
transduction
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刘长华
袁飞洋
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Earth Mountain Suzhou Microelectronics Technology Co ltd
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Earth Mountain Suzhou Microelectronics Technology Co ltd
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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
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
    • 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
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/16—Vocoder architecture
    • G10L19/167—Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/40—Details of arrangements for obtaining desired directional characteristic by combining a number of identical transducers covered by H04R1/40 but not provided for in any of its subgroups
    • H04R2201/401—2D or 3D arrays of transducers

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Computational Linguistics (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

The invention discloses a digital sound reconstruction method, digital sound reconstruction equipment, a storage medium and a digital loudspeaker, relates to the technical field of sound reconstruction, and aims to solve the technical problems that digital sound production cannot be realized and commercial mass production manufacturing of the digital sound production cannot be realized in the prior art. The digital loudspeaker comprises a transduction element array circuit and a transduction element array which are electrically connected; the digital sound reconstruction method comprises the following steps: acquiring a preprocessed audio data stream; determining the number of transducer elements matched with the sound pressure value based on the sound pressure value of the current audio data in the audio data stream; generating a circuit switched digital signal stream based on the transducer element array circuit and the number of transducer elements; and controlling the transduction element array circuit by using the circuit switch digital signal flow so as to drive the transduction elements at the corresponding positions in the transduction element array to vibrate, reconstructing the acoustic signal of the current audio data and realizing digital sound production.

Description

Digital sound reconstruction method, equipment, storage medium and digital loudspeaker
Technical Field
The present invention relates to the field of sound reconstruction technologies, and in particular, to a digital sound reconstruction method, digital sound reconstruction equipment, storage medium, and digital speaker.
Background
At present, the reproduction of sound by a loudspeaker is still on the analog sounding technology. The analog loudspeaker realizes digitization on all links of sound collection, storage, processing and the like, but the final sound production end still produces analog sound. Specifically, the analog loudspeaker firstly transmits digital audio data stored in a computer to a digital-to-analog conversion (DAC) decoding chip, the digital audio data is converted into analog voltage through the DAC and then is input to a power amplifier, and an electric signal amplified by the power amplifier is loaded to the loudspeaker so as to drive the vibrating diaphragm to move and push air to sound.
The analog loudspeaker converts a digital sound source into analog motion sound production of the diaphragm, the digital sound source has high precision in storage, and in the process from digital to analog sound production, the precision of sound reduction depends on the mechanical system of the analog loudspeaker. Therefore, the mode of simulating sound production is limited by the inherent properties of mechanical vibration, such as frequency response and harmonic distortion, and the improvement of the sound quality of the recovered sound is hindered.
Disclosure of Invention
Based on the above, the invention discloses a digital sound reconstruction method, a device, a storage medium and a digital loudspeaker, which are used for solving the technical problems that the prior art can not realize digital sound production and the commercial mass production of the digital sound production can not be realized.
In a first aspect, the present invention provides a digital sound reconstruction method, applied to a digital speaker, wherein the digital speaker includes a transducer element array circuit and a transducer element array which are electrically connected; the digital sound reconstruction method comprises the following steps:
acquiring a preprocessed audio data stream;
determining the number of transducer elements matched with the sound pressure value based on the sound pressure value of the current audio data in the audio data stream;
generating a circuit switched digital signal stream based on the transducer element array circuit and the number of transducer elements;
and controlling the transduction element array circuit by using the circuit switch digital signal flow so as to drive the transduction elements at the corresponding positions in the transduction element array to vibrate, reconstructing the acoustic signal of the current audio data and realizing digital sound production.
Under the condition of adopting the technical scheme, the invention determines the number of the transducer elements matched with the current audio data by utilizing the sound pressure value of the current audio data in the audio data stream, and generates the circuit switch digital signal stream based on the transducer element array circuit and the number of the transducer elements. Furthermore, the circuit switch digital signal flow is used for controlling the transduction element array circuit so as to drive the transduction elements at the corresponding positions in the transduction element array to vibrate, reconstruct the sound signals of the current audio data and realize digital sound production. It can be seen that, in the digital sound reconstruction method provided by the present invention, the sound pressure value of the audio data is not converted into a corresponding analog signal, but the sound pressure value of the current audio data in the audio data stream is directly utilized to determine the number of the transduction elements matched with the sound pressure value, so as to generate a circuit switch digital signal stream, and finally, the circuit switch digital signal stream is utilized to control the transduction element array circuit, so as to drive the transduction elements at the corresponding positions in the transduction element array to vibrate, reconstruct the sound signal of the current audio data, and implement digital sound production. Therefore, the digital sound reconstruction method can provide a technical scheme for realizing digital sound production and commercial mass production of the digital sound production.
In a second aspect, an embodiment of the present invention provides a digital sound reconstruction apparatus, including a processor and a communication interface coupled to the processor; the processor is used to run a computer program or instructions to implement the digital sound reconstruction method.
In a third aspect, an embodiment of the present invention provides a computer storage medium having instructions stored therein, where the instructions, when executed, implement a digital sound reconstruction method.
In a fourth aspect, an embodiment of the present invention provides a digital speaker, including a transduction element array circuit, a transduction element array digital sound reconstruction apparatus; the digital sound reconstruction device is electrically connected to the transducer element array circuit, which is electrically connected to the transducer element array;
the transduction element array circuit is used for driving the transduction elements at a plurality of positions in the transduction element array to vibrate according to a circuit switch digital signal flow which is provided by the digital sound reconstruction equipment and is matched with the sound pressure value of the current audio data in the audio data flow, reconstructing sound signals meeting the current audio data and realizing digital sound production.
Compared with the prior art, the beneficial effects of the second aspect, the third aspect and the fourth aspect of the invention are the same as those of the assessment and evaluation method of the technical scheme, and are not repeated herein.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not limit the invention. In the drawings:
fig. 1 is a flowchart illustrating steps of a digital sound reconstruction method according to an embodiment of the present invention;
fig. 2 is a flowchart of a digital sound reconstruction method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a transducer array circuit and a transducer array in a digital speaker according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a distortion and signal-to-noise ratio simulation of a digital loudspeaker based on the structure of fig. 3 according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a transducing element array circuit and a transducing element array in another digital speaker according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a transducer array circuit and a transducer array in another digital speaker according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a digital loudspeaker distortion and signal-to-noise ratio simulation based on the structure of fig. 6 according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a transducer array circuit and a transducer array in another digital speaker according to an embodiment of the present invention;
Fig. 9 is a schematic diagram of a hardware structure of a digital sound reconstruction apparatus according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a chip according to an embodiment of the present invention.
Detailed Description
In order to facilitate clear description of technical solutions of the embodiments of the present invention, in the embodiments of the present invention, terms such as "first" and "second" are used to distinguish the same items or similar items having substantially the same functions and actions. For example, the first threshold and the second threshold are only used for distinguishing different thresholds, and the sequence order of the thresholds is not limited. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.
It is to be understood that the terms "exemplary" or "such as" are used herein to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
In the present invention, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a alone, A and B together, and B alone, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a and b combination, a and c combination, b and c combination, or a, b and c combination, wherein a, b and c can be single or multiple.
The invention discloses a digital sound reconstruction method, digital sound reconstruction equipment, a storage medium and a digital loudspeaker, which are used for solving the technical problems that digital sound production cannot be realized and commercial mass production of the digital sound production cannot be realized in the prior art.
Digital speakers produce sound directly using digital audio data without the need for a D/a (digital to analog) conversion unit. Different completely in the vocal principle with traditional analog loudspeaker, digital loudspeaker direct control transducer element array sends discrete acoustic pulse, and the acoustic pulse superposes in the sound field in the air, realizes low pass filtering through the hearing characteristic of people's ear, and consequently digital loudspeaker's structure is simpler, and the sound is restored and is no longer limited by analog loudspeaker's vibration characteristic, and sound restoration tone quality is higher.
Pulse Code Modulation (PCM) is a common format for audio data stream storage that samples, quantizes, and encodes the amplitude of the sound pressure waveform into a 0-1 digital form for storage in a computer. PCM-based digital loudspeaker sound production techniques directly use stored audio digital to directly drive electro-acoustic transducing elements. The electroacoustic transducer elements emit sound pressure pulses of a switching sequence, and digital pulse sound waves of the sound emitting arrays of the transducer elements realize sound field recombination and superposition to realize sound production.
The digital sound reconstruction method provided by the embodiment of the invention is applied to a digital loudspeaker, and the digital loudspeaker comprises a transduction element array circuit and a transduction element array which are electrically connected.
Referring to fig. 1, the digital sound reconstruction method includes the steps of:
and S100, acquiring the preprocessed audio data stream.
In practice, the preprocessed audio data stream may be obtained by preprocessing any audio data stream, and this is not particularly limited in the embodiment of the present invention.
Before acquiring the pre-processed audio data stream, the method for reconstructing digital sound according to the embodiment of the present invention further includes: an audio data stream is obtained. The audio data stream is audio data without any compression, and can be directly transmitted to the digital loudspeaker through the I2S.
And then, in a digital loudspeaker, carrying out format conversion, Bit conversion, noise reduction processing and noise shaping processing on the audio data stream to obtain the preprocessed audio data stream.
Based on this, the digital loudspeaker comprises an audio format converter, a Bit converter, a noise reduction processor and a noise shaper, so as to respectively realize format conversion, Bit conversion, noise reduction processing and noise shaping processing of the audio data stream, and obtain the preprocessed audio data stream.
And S200, determining the number of the transduction elements matched with the sound pressure value based on the sound pressure value of the current audio data in the audio data stream.
It should be understood that the sound production accuracy of the digital loudspeaker and the number of the transducing elements of the digital loudspeaker array are in positive correlation, and the higher the number of the transducing elements is, the higher the accuracy of the sound reproduction is.
For a digital speaker to reconstruct a sound with k Bit accuracy based on the PCM method, about 2 is requiredkA transducing element. Here, k is 10, that is, the sounding array includes 1024 transducer elements. If each transducer element can be independently controlled and the working frequency of the transducer element is close to the PCM sampling frequency, digital sound with 10-Bit precision can be reconstructed by 1024 transducer element arrays theoretically.
For example, a 16Bit 44.1kHz audio sound pressure data Y is selected, the range of Y is between 0 and 65536, and the number of driving speakers is N. 10000 loudspeakers in number are 1024. The sound pressure value Y corresponds to 156.25 of loudspeakers to be driven, wherein the fractional part influence is not considered, i.e. the number of loudspeakers to be driven is 156.
And S300, generating a circuit switch digital signal stream based on the transduction element array circuit and the number of the transduction elements.
In the embodiment of the invention, after the number of the transducer elements to be driven is obtained, according to the circuit structure of the transducer element array circuit, a circuit switch digital signal stream capable of driving the corresponding transducer elements satisfying the number of the transducer elements to vibrate is determined. Wherein each circuit switch digital signal is used to drive at least one transducing element drive.
Wherein, before generating a circuit switched digital signal stream based on the transducer element array circuit and the number of transducer elements, the digital sound reconstruction method further comprises:
first, the built-in parameters of the transducer element array circuit are prestored. Specifically, the built-in parameters include: a number of driven transducing elements and a switch address corresponding to the number of driven transducing elements.
In practice, the built-in parameters of the transducer element array circuit are pre-stored in the memory of the digital speaker, and when the number of transducer elements to be driven is determined, the corresponding switch addresses are matched in the memory of the digital speaker. Based on this, the digital loudspeaker can quickly respond to the acquired audio data stream to reconstruct the acoustic signal of the current audio data.
For example, when 1024 transducing elements need to be driven to vibrate, the switch addresses corresponding to the 1024 transducing elements are looked up in the memory of the digital speaker.
A circuit switched digital signal stream is then generated based on the number of transducing elements and the switch address corresponding to the number of transducing elements.
It should be understood that the circuit switch digital signal streams generated as described above include switch digital signals for controlling the vibration of the respective transducer elements, each switch digital signal corresponding to a switch address for opening a corresponding switch in the transducer element array circuit to drive the vibration of the corresponding transducer element in the transducer element array.
And S400, controlling the transduction element array circuit by using the circuit switch digital signal flow so as to drive the transduction elements at the corresponding positions in the transduction element array to vibrate and reconstruct the sound signals of the current audio data to realize digital sound production.
Under the control of the circuit switch digital signal flow, the transduction element array circuit is used for driving the transduction elements at the corresponding positions in the transduction element array to vibrate, and reconstructing the sound signals of the current audio data so as to realize digital sound production.
It will be appreciated that in practice it is often necessary to reconstruct the audio data stream to enable digital sound production. The audio data stream comprises a plurality of audio data, and at the moment, a plurality of circuit switch digital signal streams can be generated according to the relation among the audio data, and the plurality of circuit switch digital signal streams are sequentially utilized to control the transduction element array circuit so as to drive the transduction elements at the corresponding positions in the transduction element array to vibrate for a plurality of times, so that the audio data stream is reconstructed, and digital sound production is realized.
Fig. 2 is a flowchart illustrating a digital sound reconstruction method according to an embodiment of the present invention, and referring to fig. 2, the acquired PCM audio data stream enters a circulator, and the circulator traverses pre-stored built-in parameters of the transducer array circuit according to the PCM audio data stream to determine, from the pre-stored built-in parameters of the transducer array circuit, a number of transducer elements closest to a sound pressure value of current audio data of the PCM audio data stream.
And then shaping, filtering and the like the jitter and noise existing in the PCM audio data stream, and then enabling the PCM audio data stream to enter a subtracter, wherein the subtracter is used for carrying out subtraction operation on the number of the transduction elements determined according to the sound pressure value of the current audio data of the PCM audio data stream and the number of the transduction elements determined from the pre-stored built-in parameters of the transduction element array circuit to obtain an operation result. The operation result is input into a judger, and the judger also stores the operation result of the subtracter in the previous cycle. And the judger compares the two operation results, and if the operation result obtained by the current iteration is closest to the number of the transduction elements determined according to the sound pressure value of the current audio data of the PCM audio data stream, the original optimal driving information in the storage is replaced by the current traversal parameter. Wherein the memory pre-stores circuit parameters of the array of transducer elements and stores optimal drive information for the current cycle. And after traversing all built-in parameters, ending circulation, outputting an optimal drive circuit signal in the memory, and generating a corresponding 01 control switch signal flow.
In an embodiment of the present invention, the transduction element array circuit includes a plurality of control ports, and the circuit switches digital signal streams to control corresponding ones of the control ports, so as to drive the transduction elements at corresponding positions in the transduction element array to vibrate, reconstruct an acoustic signal satisfying the current audio data, and implement digital sound production.
As a specific example, referring to fig. 3, the transducer element array is an m row by m column transducer element array. The transducer element array circuit comprises m first control ports and m second control ports; wherein each first control port and the corresponding second control port form a group of row and column control ports.
The x group of row and column control ports are electrically connected with part of the transduction elements in the x row and part of the transduction elements in the x column in the transduction element array so as to drive 2x-1 transduction elements to vibrate, x is a positive integer, and x is smaller than or equal to m.
In the digital loudspeaker configuration shown in fig. 3, the first set of row and column control ports is capable of controlling 1 transducer element to vibrate. The second set of row and column control ports is capable of controlling the 3 transducing elements to vibrate. The third set of row and column control ports is capable of controlling the 5 transducing elements to vibrate. The fourth set of row and column control ports can control the 7 transducer elements to vibrate. It will be appreciated that the loudspeaker shown in figure 3 comprises a transducer element array circuit of 4 rows and 4 columns of transducer elements, and 4 first control ports and 4 second control ports, that is, where m is 4, m in practice may be any value in embodiments of the invention.
In the digital loudspeaker configuration shown in fig. 3, the number of transducer elements that can be driven by the multiple sets of row and column control ports is increased in the form of 1,3,5,7, 2x-1, 2 m-1. Since the row and column control ports of the transducer element array circuit control 2x n-1 transducer elements at a time, the amplitude of the recovered sound is the combined number of 2x n-1. And the above-mentioned transduction component array circuit and transduction component array can connect more transduction components through fewer lines, it is simpler in manufacture and design.
Based on the transduction element array circuit and the transduction element array, 1000Hz sine wave sound reconstruction is simulated, the precision of a PCM control sequence under the control can be calculated, referring to FIG. 4, 1024 transduction elements are taken as an example, the signal-to-noise ratio is displayed to be 62dB, the total distortion is less than minus 60dB, the control precision is consistent with the PCM full control precision, and the validity of the transduction element array circuit structure is verified.
As another example, referring to fig. 5, the array of transducing elements is an array of m rows and m columns of transducing elements; the transducer element array circuit comprises m first control ports and m second control ports; wherein each first control port and the corresponding second control port form a group of row and column control ports.
The x group of row and column control ports are electrically connected with the transduction elements in the x row or x column in the transduction element array so as to drive the x transduction elements to vibrate, wherein x is a positive integer and is less than or equal to m.
The x-th set of row and column control ports in the digital loudspeaker of fig. 5 is used to drive the x transducing elements to vibrate. That is, the 1 st group of row and column control ports is used for driving 1 transducer element to vibrate, and the 3 rd group of row and column control ports is used for driving 3 transducer elements to vibrate. If 1024 transducer elements need to be driven to vibrate, the numbers of the transducer elements which can be driven by the multiple groups of row and column control ports can be superposed, and if 1024 are obtained, the 1024 transducer elements in the transducer array can be driven to vibrate by driving the transducer element array circuit through the multiple groups of row and column control ports.
As another example, the array of transducing elements is an array of m rows and m columns of transducing elements; the transducer element array circuit comprises m first control ports and m second control ports; wherein each first control port and the corresponding second control port form a group of row and column control ports.
The x group of row and column control ports are electrically connected with the transduction elements in the x row or the x column in the transduction element array so as to drive 2x transduction elements to vibrate, x is a positive integer, and x is smaller than or equal to m.
It is understood that in this example, 2x number of transducer elements can be driven to vibrate through the x-th group of row and column control ports. That is, the 1 st group of row and column control ports is used for driving 2 transducer elements to vibrate, and the 3 rd group of row and column control ports is used for driving 6 transducer elements to vibrate. If 1024 transducer elements need to be driven to vibrate, the number of the transducer elements which can be driven by the multiple groups of row and column control ports can be superposed, and if 1024 transducer elements are obtained, the 1024 transducer elements in the transducer element array can be driven to vibrate by driving the transducer element array circuit through the multiple groups of row and column control ports. If 1024 cannot be obtained by superposing the numbers of the transducer elements which can be driven by the sets of row and column control ports, the transducer element array circuit can be driven according to the sets of row and column control ports which are closest to 1024 so as to drive 1024 transducer elements to vibrate.
As yet another example, referring to fig. 6, the array of transducing elements is an array of n rows and k columns of transducing elements; the transducer element array circuit comprises n first control ports and k second control ports; n may be equal to k, or may be greater than or less than k, which is not specifically limited in this embodiment of the present invention.
Each of the first control ports is electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports is electrically connected to each of the transducing elements in a corresponding column of transducing elements.
In this regard, each first control port is for controlling each of the transducing elements in the corresponding row of transducing elements to vibrate and each second control port is for controlling each of the transducing elements in the corresponding column of transducing elements to vibrate.
Referring to fig. 6, the structure of the digital loudspeaker is simpler, but the circuit of the transducer element array cannot control a single element precisely due to the limitation of the series connection of rows and columns, and the quantization distortion of the loudspeaker is larger. Similarly, we simulate a 1000Hz sine wave sound reconstruction and can calculate the accuracy of the PCM control sequence under this control. Referring to fig. 7, the 1024 transducer elements are taken as an example and obtained through analog calculation, wherein the digital sounding signal-to-noise ratio of the 1024 transducer elements is 38dB and the total distortion is-38 dB based on the digital loudspeaker in fig. 6. The method can reduce the manufacturing cost of the digital loudspeaker by reducing the signal-to-noise ratio, reduce the sensitivity to random pixel damage, and ensure higher performance reliability of the digital loudspeaker under the control of the type, thereby being suitable for loudspeaker application markets with higher reliability requirements.
As yet another example, referring to fig. 8, the array of transducing elements includes a first array of transducing elements and a second array of transducing elements; the first transduction element array is an a-row and c-column transduction element array, and the second transduction element array is a b-row and c-column transduction element array; the first transduction element array circuit includes a first control ports and c second control ports, and the second transduction element array circuit includes b first control ports and c second control ports; wherein b < a; in the first array of transducing elements, each of the first control ports is electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports is electrically connected to each of the transducing elements in a corresponding column of transducing elements; in the second array of transducing elements, each of the first control ports is electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports is electrically connected to each of the transducing elements in a corresponding column of transducing elements.
In this example, the array of transducing elements consists of a + b rows of transducing elements. The transducer is divided into two parts, namely a row of transducer units and b row of transducer units. The row a of transduction unit areas are low-precision control unit areas, the row b of transduction unit areas are high-precision control unit areas, and each unit is independently controlled. In the actual sound production process, the high-precision control unit is used for making up for the error of the unquantized part of the low-precision unit, and the error amount of the original low-precision unit simulation is reduced through the participation of the high-precision unit.
For example, 1024 transducer cells may be divided into 32 × 31 low-precision cells, 1 × 32 high-precision cells. The sound quality of the sound restored by the combined digital loudspeaker obtained by analog calculation is consistent with the full-control quantization precision of 1024 units, and the signal-to-noise ratio is 62 dB.
As yet another example, the array of transducing elements includes a first array of transducing elements and a second array of transducing elements; the first transduction element array is an a-row and b-column transduction element array, and the second transduction element array is an a-row and c-column transduction element array; the first transduction element array circuit includes a first control ports and b second control ports, and the second transduction element array circuit includes a first control ports and c second control ports;
In the first array of transducing elements, each of the first control ports is electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports is electrically connected to each of the transducing elements in a corresponding column of transducing elements;
in the second array of transducing elements, each of the first control ports is electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports is electrically connected to each of the transducing elements in a corresponding column of transducing elements; wherein c < b.
In this example, the array of transducing elements consists of b + c columns of transducing cells. The transducer is divided into two parts, namely b columns of transducer units and c columns of transducer units. The transducer unit area in the b column is a low-precision control unit area, the transducer unit area in the c column is a high-precision control unit area, and each unit is independently controlled. In the actual sound production process, the high-precision control unit is used for making up for the error of the unquantized part of the low-precision unit, and the error amount of the original low-precision unit simulation is reduced through the participation of the high-precision unit.
For example, 1024 transducer cells may be divided into 31 × 32 low-precision cells, 32 × 1 high-precision cells. The sound quality of the sound restored by the combined digital loudspeaker obtained by analog calculation is consistent with the full-control quantization precision of 1024 units, and the signal-to-noise ratio is 62 dB.
Fig. 9 is a schematic diagram illustrating a hardware structure of a digital sound reconstruction apparatus according to an embodiment of the present invention. As shown in fig. 9, the digital sound based reconstruction device 80 includes a processor 801 and a communication interface 802.
As shown in fig. 9, the processor may be a general processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more ics for controlling the execution of programs according to the present invention. The number of the communication interfaces may be one or more. The communication interface may use any transceiver or the like for communicating with other devices or communication networks.
As shown in fig. 9, the above-described digital sound reconstruction apparatus may further include a communication line 803. The communication link may include a path for transmitting information between the aforementioned components.
Optionally, as shown in fig. 9, the digital sound reconstruction apparatus may further include a memory 804. The memory is used for storing computer-executable instructions for implementing the inventive arrangements and is controlled by the processor for execution. The processor is used for executing the computer execution instructions stored in the memory, thereby realizing the method provided by the embodiment of the invention.
As shown in fig. 9, the memory may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a Random Access Memory (RAM) or other types of dynamic storage devices that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), but is not limited to, magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory may be self-contained and coupled to the processor via a communication link. The memory may also be integrated with the processor.
Optionally, the computer execution instruction in the embodiment of the present invention may also be referred to as an application program code, which is not specifically limited in the embodiment of the present invention.
In particular implementations, as one embodiment, processor 801 may include one or more CPUs, such as CPU0 and CPU1 in fig. 9, as shown in fig. 9.
In a specific implementation, as an example, as shown in fig. 9, the digital sound reconstruction apparatus may include a plurality of processors, such as the processor 801-1 and the processor 801-2 in fig. 9. Each of these processors may be a single-core processor or a multi-core processor.
The embodiment of the invention also discloses a digital loudspeaker, which comprises a transduction element array circuit, a transduction element array and the digital sound reconstruction equipment; the digital sound reconstruction device is electrically connected to the transducer element array circuit, which is electrically connected to the transducer element array;
the transduction element array circuit is used for driving the transduction elements at a plurality of positions in the transduction element array to vibrate according to a circuit switch digital signal flow which is provided by the digital sound reconstruction equipment and is matched with the sound pressure value of the current audio data in the audio data flow, reconstructing sound signals meeting the current audio data and realizing digital sound production.
The transducer element array is an m-row and m-column transducer element array;
the transducer element array circuit comprises m first control ports and m second control ports; each first control port and the corresponding second control port form a group of row and column control ports;
The x group of row and column control ports are electrically connected with part of the transduction elements in the x row and part of the transduction elements in the x column in the transduction element array so as to drive 2x-1 transduction elements to vibrate, x is a positive integer and is less than or equal to m;
or the transduction element array is an m-row m-column transduction element array; the transducer element array circuit comprises m first control ports and m second control ports; each first control port and the corresponding second control port form a group of row and column control ports;
the x group of row and column control ports are electrically connected with the transduction elements in the x row or x column in the transduction element array so as to drive the x transduction elements to vibrate, wherein x is a positive integer and is less than or equal to m;
or the transduction element array is an m-row m-column transduction element array; the transducer element array circuit comprises m first control ports and m second control ports; each first control port and the corresponding second control port form a group of row and column control ports;
the x group of row and column control ports are electrically connected with the transduction elements in the x row or x column in the transduction element array so as to drive 2x transduction elements to vibrate, x is a positive integer, and x is smaller than or equal to m.
Or, the transduction element array is an n-row and k-column transduction element array;
the transducer element array circuit comprises n first control ports and k second control ports;
each of the first control ports is electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports is electrically connected to each of the transducing elements in a corresponding column of transducing elements;
or, the array of transducing elements comprises a first array of transducing elements and a second array of transducing elements; the first transduction element array is an a-row and c-column transduction element array, and the second transduction element array is a b-row and c-column transduction element array; the first transducer element array circuit comprises a first control ports and c second control ports, and the second transducer element array circuit comprises b first control ports and c second control ports; wherein b < a;
in the first array of transducing elements, each of the first control ports is electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports is electrically connected to each of the transducing elements in a corresponding column of transducing elements;
in the second array of transducing elements, each of the first control ports is electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports is electrically connected to each of the transducing elements in a corresponding column of transducing elements;
Or, the array of transducing elements comprises a first array of transducing elements and a second array of transducing elements; the first transduction element array is an a-row and b-column transduction element array, and the second transduction element array is an a-row and c-column transduction element array; the first transducer element array circuit comprises a first control ports and b second control ports, the second transducer element array circuit comprises a first control ports and c second control ports;
in the first array of transducing elements, each of the first control ports is electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports is electrically connected to each of the transducing elements in a corresponding column of transducing elements;
in the second array of transducing elements, each of the first control ports being electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports being electrically connected to each of the transducing elements in a corresponding column of transducing elements; wherein c < b.
Fig. 10 is a schematic structural diagram of a chip according to an embodiment of the present invention. As shown in fig. 10, the chip 90 includes one or more than two (including two) processors 801 and a communication interface 802.
Optionally, as shown in FIG. 10, the chip also includes a memory 804, which may include read-only memory and random access memory, and provides operating instructions and data to the processor. The portion of memory may also include non-volatile random access memory (NVRAM).
In some embodiments, as shown in FIG. 10, the memory stores elements, execution modules or data structures, or a subset thereof, or an expanded set thereof.
In the embodiment of the present invention, as shown in fig. 10, by calling an operation instruction stored in the memory (the operation instruction may be stored in the operating system), a corresponding operation is performed.
As shown in fig. 10, a processor, which may also be referred to as a Central Processing Unit (CPU), controls the processing operations of any one of the digital sound reconstruction devices.
As shown in fig. 10, the memory may include both read-only memory and random access memory and provide instructions and data to the processor. The portion of memory may also include NVRAM. For example, in applications where the memory, communication interface, and memory are coupled together by a bus system that may include a power bus, a control bus, a status signal bus, etc., in addition to a data bus. For clarity of illustration, however, the various buses are designated as bus system 805 in fig. 10.
As shown in fig. 10, the method disclosed in the above embodiment of the present invention can be applied to a processor, or implemented by a processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The processor may be a general purpose processor, a Digital Signal Processor (DSP), an ASIC, an FPGA (field-programmable gate array) or other programmable logic device, discrete gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.
In one possible implementation, as shown in fig. 10, the communication interface is used to obtain images captured by a camera. The processor is used for executing steps 101 to 103 of the assessment evaluation method in the embodiment shown in fig. 1.
In one aspect, a computer-readable storage medium is provided, in which instructions are stored, and when executed, implement the functions performed by the digital sound reconstruction device in the above embodiments.
In one aspect, a chip is provided, the chip is applied to a digital sound reconstruction device, the chip includes at least one processor and a communication interface, the communication interface is coupled to the at least one processor, and the processor is configured to execute instructions to implement the functions performed by the digital sound reconstruction device in the foregoing embodiments.
In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present invention are performed in whole or in part. The computer may be a general purpose computer, special purpose computer, computer network, terminal, user equipment, or other programmable device. The computer program or instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer program or instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire or wirelessly. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that integrates one or more available media. The usable medium may be a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape; or optical media such as Digital Video Disks (DVDs); it may also be a semiconductor medium, such as a Solid State Drive (SSD).
While the invention has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Although the present invention has been described in connection with the specific features and embodiments thereof, it is apparent that various modifications and combinations can be made thereto without departing from the spirit and scope of the invention. Accordingly, the specification and drawings are merely illustrative of the invention as defined by the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (12)

1. A digital sound reconstruction method is characterized in that the method is applied to a digital loudspeaker, and the digital loudspeaker comprises a transduction element array circuit and a transduction element array which are electrically connected; the digital sound reconstruction method comprises the following steps:
acquiring a preprocessed audio data stream;
determining the number of transduction elements matched with the sound pressure value based on the sound pressure value of the current audio data in the audio data stream;
generating a circuit switched digital signal stream based on the array of transducing elements circuit and the number of transducing elements;
and controlling the transduction element array circuit by using the circuit switch digital signal flow, and driving the transduction elements at corresponding positions in the transduction element array to vibrate so as to reconstruct the sound signal of the current audio data and realize digital sound production.
2. The method of claim 1, wherein prior to said obtaining the pre-processed audio data stream, the method further comprises:
acquiring an audio data stream;
and carrying out format conversion, Bit conversion, noise reduction processing and noise shaping processing on the audio data stream to obtain the preprocessed audio data stream.
3. The digital sound reconstruction method of claim 1, wherein prior to generating a circuit switched digital signal stream based on the array of transducing elements circuit and the number of transducing elements, the digital sound reconstruction method further comprises:
pre-storing built-in parameters of the transducer element array circuit, wherein the built-in parameters include: the number of driven transducing elements and switch addresses corresponding to the number of driven transducing elements;
the generating a circuit switched digital signal stream based on the array of transducing elements circuit and the number of transducing elements includes:
determining, in the transducing element array circuit, a switch address corresponding to the number of transducing elements based on the number of transducing elements;
generating a circuit switch digital signal stream based on the number of transducing elements and a switch address corresponding to the number of transducing elements.
4. The method according to claim 1, wherein the transducer array circuit comprises a plurality of control ports, and the circuit switches a digital signal stream to control corresponding ones of the control ports to drive the transducers at corresponding positions in the transducer array to vibrate to reconstruct the acoustic signal satisfying the current audio data, thereby realizing digital sound generation.
5. The digital sound reconstruction method of claim 4, wherein the array of transducer elements is an array of m rows and m columns of transducer elements;
the transducer element array circuit comprises m first control ports and m second control ports; each first control port and the corresponding second control port form a group of row and column control ports;
the x group of row and column control ports are electrically connected with part of the transduction elements in the x row and part of the transduction elements in the x column in the transduction element array so as to drive 2x-1 transduction elements to vibrate, x is a positive integer, and x is smaller than or equal to m.
6. The digital sound reconstruction method of claim 4, wherein the array of transducer elements is an array of m rows and m columns of transducer elements; the transducer element array circuit comprises m first control ports and m second control ports; each first control port and the corresponding second control port form a group of row and column control ports;
the x group of row and column control ports are electrically connected with the transduction elements in the x row or x column in the transduction element array so as to drive the x transduction elements to vibrate, wherein x is a positive integer and is less than or equal to m;
Or, the transducer element array is an m-row and m-column transducer element array; the transducer element array circuit comprises m first control ports and m second control ports; each first control port and the corresponding second control port form a group of row and column control ports;
the x group of row and column control ports are electrically connected with the transduction elements in the x row or x column in the transduction element array so as to drive 2x transduction elements to vibrate, x is a positive integer, and x is smaller than or equal to m.
7. The digital sound reconstruction method of claim 4, wherein the array of transducing elements is an array of n rows and k columns of transducing elements;
the transducer element array circuit comprises n first control ports and k second control ports;
each of the first control ports is electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports is electrically connected to each of the transducing elements in a corresponding column of transducing elements.
8. The digital sound reconstruction method of claim 4, wherein the array of transducing elements includes a first array of transducing elements and a second array of transducing elements; the first transduction element array is an a-row and c-column transduction element array, and the second transduction element array is a b-row and c-column transduction element array; the first transduction element array circuit includes a first control ports and c second control ports, and the second transduction element array circuit includes b first control ports and c second control ports; wherein b < a;
In the first array of transducing elements, each of the first control ports is electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports is electrically connected to each of the transducing elements in a corresponding column of transducing elements;
in the second array of transducing elements, each of the first control ports is electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports is electrically connected to each of the transducing elements in a corresponding column of transducing elements; wherein c < b
Or, the array of transducing elements comprises a first array of transducing elements and a second array of transducing elements; the first transduction element array is an a-row and b-column transduction element array, and the second transduction element array is an a-row and c-column transduction element array; the first transduction element array circuit includes a first control ports and b second control ports, and the second transduction element array circuit includes a first control ports and c second control ports;
in the first array of transducing elements, each of the first control ports is electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports is electrically connected to each of the transducing elements in a corresponding column of transducing elements;
In the second array of transducing elements, each of the first control ports is electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports is electrically connected to each of the transducing elements in a corresponding column of transducing elements.
9. A digital sound reconstruction device comprising a processor and a communication interface coupled to the processor; the processor is adapted to run a computer program or instructions to implement the digital sound reconstruction method of any one of claims 1 to 8.
10. A computer storage medium having stored therein instructions which, when executed, implement the digital sound reconstruction method of any of claims 1 to 8.
11. A digital loudspeaker comprising a transducer element array circuit, an array of transducer elements, and the digital sound reconstruction device of claim 9; the digital sound reconstruction device is in electrical connection with the array of transducing elements circuit, which is in electrical connection with the array of transducing elements;
the transduction element array circuit is used for driving the transduction elements at a plurality of positions in the transduction element array to vibrate according to a circuit switch digital signal flow which is provided by the digital sound reconstruction equipment and is matched with the sound pressure value of the current audio data in the audio data flow, reconstructing sound signals meeting the current audio data and realizing digital sound production.
12. The digital loudspeaker of claim 11, wherein the array of transducing elements is an m row by m column array of transducing elements;
the transducer element array circuit comprises m first control ports and m second control ports; each first control port and the corresponding second control port form a group of row and column control ports;
the x group of row and column control ports are electrically connected with part of the transduction elements in the x row and part of the transduction elements in the x column in the transduction element array so as to drive 2x-1 transduction elements to vibrate, x is a positive integer and is smaller than or equal to m;
or, the transducer element array is an m-row and m-column transducer element array; the transducer element array circuit comprises m first control ports and m second control ports; each first control port and the corresponding second control port form a group of row and column control ports;
the x group of row and column control ports are electrically connected with the transduction elements in the x row or x column in the transduction element array so as to drive the x transduction elements to vibrate, wherein x is a positive integer and is less than or equal to m;
or, the transducer element array is an m-row and m-column transducer element array; the transducer element array circuit comprises m first control ports and m second control ports; each first control port and the corresponding second control port form a group of row and column control ports;
The x group of row and column control ports is electrically connected with the transduction elements in the x row or x column in the transduction element array so as to drive 2x transduction elements to vibrate, x is a positive integer, and x is smaller than or equal to m.
Or, the transduction element array is an n-row and k-column transduction element array;
the transducer element array circuit comprises n first control ports and k second control ports;
each of the first control ports is electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports is electrically connected to each of the transducing elements in a corresponding column of transducing elements;
or, the array of transducing elements comprises a first array of transducing elements and a second array of transducing elements; the first transduction element array is an a-row and c-column transduction element array, and the second transduction element array is a b-row and c-column transduction element array; the first transduction element array circuit includes a first control ports and c second control ports, and the second transduction element array circuit includes b first control ports and c second control ports; wherein b < a;
in the first array of transducing elements, each of the first control ports is electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports is electrically connected to each of the transducing elements in a corresponding column of transducing elements;
In the second array of transducing elements, each of the first control ports being electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports being electrically connected to each of the transducing elements in a corresponding column of transducing elements;
or, the array of transducing elements comprises a first array of transducing elements and a second array of transducing elements; the first transduction element array is an a-row and b-column transduction element array, and the second transduction element array is an a-row and c-column transduction element array; the first transducer element array circuit comprises a first control ports and b second control ports, the second transducer element array circuit comprises a first control ports and c second control ports;
in the first array of transducing elements, each of the first control ports is electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports is electrically connected to each of the transducing elements in a corresponding column of transducing elements;
in the second array of transducing elements, each of the first control ports being electrically connected to each of the transducing elements in a corresponding row of transducing elements and each of the second control ports being electrically connected to each of the transducing elements in a corresponding column of transducing elements; wherein c < b.
CN202210389776.1A 2022-04-13 2022-04-13 Digital sound reconstruction method, equipment, storage medium and digital loudspeaker Pending CN114760562A (en)

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