CN116634328A - Broadband ring type phased array sound box system - Google Patents
Broadband ring type phased array sound box system Download PDFInfo
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- CN116634328A CN116634328A CN202310668539.3A CN202310668539A CN116634328A CN 116634328 A CN116634328 A CN 116634328A CN 202310668539 A CN202310668539 A CN 202310668539A CN 116634328 A CN116634328 A CN 116634328A
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- 238000004364 calculation method Methods 0.000 description 2
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Classifications
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
The invention discloses a broadband ring type phased array loudspeaker box system. The system comprises a broadband signal input module, an ADC (analog to digital converter) module, a primary DSP frequency division module, an MCU (micro control Unit) main controller module, a DSP phase delay device module, an MCU secondary control module, a DA (digital to analog) conversion module, an AMP (analog to digital) amplification module and a loudspeaker, wherein the DSP phase delay device module, the MCU secondary control module, the DA conversion module and the AMP amplification module jointly form a loudspeaker control unit module, and each narrow-band annular phase control subsystem comprises a plurality of loudspeakers and a plurality of loudspeaker control unit modules which are uniformly arranged into an annular ring. The invention can realize wideband voice phase control sounding and three-dimensional sound wave beam pointing adjustment, and can be widely applied to the technical field of sound field control.
Description
Technical Field
The invention relates to the field of audio beam control, in particular to a broadband ring type phased array loudspeaker box system.
Background
In the electroacoustic technical field, research on the sound emission direction control of a loudspeaker has been a leading edge key field. The existing technology for realizing directional emission of the loudspeaker and strong directional audio frequency is generally based on the ultrasonic parametric array difference frequency principle or the phased array principle. The directional sound production effect realized based on the former ultrasonic parametric array is severely limited by the sound energy conversion efficiency, and very high driving voltage and power are often required to generate audible directional audio sound pressure; the strong directional sound box based on the phased array principle is influenced by the number of array elements and the wavelengths of different signal frequencies, and if the distance between the array elements of the loudspeaker exceeds the half wavelength of the center frequency, a large number of side lobes are easy to generate, so that the sound directional effect of the sound box is seriously influenced.
Therefore, the existing phased array loudspeaker box mainly comprises strip-shaped loudspeaker arrays distributed at equal intervals, a stronger sound direction adjusting effect is generally realized only in partial vertical direction and middle frequency narrow frequency band range, a stronger sound wave beam deflection or focusing effect is difficult to form in the rest high-low frequency band range and horizontal direction, the directional emission effect is poor, and the directional emission effect is still limited by various indoor sound field environment conditions.
There is a need for a directional loudspeaker system that enables vertical and horizontal adjustment of an audio beam over a wide frequency band.
Disclosure of Invention
In order to solve the problems, the invention provides a broadband ring type phased array loudspeaker system.
The invention adopts the technical scheme that:
a wideband ring phased array loudspeaker system comprising:
the broadband signal input module is used for accessing a broadband audio analog signal;
the ADC module is used for converting the broadband audio analog signal into a broadband audio digital signal;
the primary DSP frequency dividing module is used for carrying out band-pass filtering processing and dividing on the broadband audio digital signal conversion to obtain multiple paths of frequency-divided narrowband digital audio signals;
the MCU main controller module is used for controlling the band-pass filtering parameters and the frequency division quantity of the primary DSP frequency division module;
a DSP phase delay module for applying a time delay to the narrowband digital audio signal;
the MCU secondary control module is used for controlling the time delay parameter of the DSP phase delay module;
the DA conversion module is used for converting the narrow-band digital audio signal into a narrow-band audio analog signal;
an AMP amplification module for amplifying the narrowband audio analog signal and driving a speaker;
a speaker for outputting the amplified narrowband audio signal as audible sound waves;
the DSP phase delay device module, the MCU secondary control module, the DA conversion module and the AMP amplification module jointly form a loudspeaker control unit module, and each narrow-band annular phase control subsystem comprises a plurality of loudspeakers and a plurality of loudspeaker control unit modules which are uniformly arranged into an annular ring.
Characterized by further comprising: and the MCU secondary control module calculates and adjusts the time delay parameter T of each DSP phase delay device module according to the included angle theta 1 between the projection of the sound wave beam space deflection direction on the loudspeaker plane and the polar axis of the loudspeaker plane, the included angle theta 2 between the sound wave beam space deflection direction and the normal direction of the loudspeaker plane and the loudspeaker distribution radius R.
Preferably, the plurality of narrowband annular phase control subsystems are arranged in concentric circles, and the number of speakers contained in each narrowband annular phase control subsystem is the same as the number of speaker control unit modules.
Preferably, the wideband sound signal is divided into multiple audio signals with different frequency bands, and the frequency bands of the sound played by the multiple narrowband annular phase control subsystems are different.
Preferably, the narrower-band annular phase control subsystem with smaller speaker distribution radius R is responsible for playing higher sound frequency, and the narrower-band annular phase control subsystem with larger speaker distribution radius R is responsible for playing lower sound frequency.
Compared with the prior art, the invention has the beneficial effects that:
the broadband ring-type phased array sound box system adopts a plurality of narrow-band ring-type phase control subsystems with different distribution radiuses R to respectively take charge of audio frequency bands with different center frequencies, and the distance between each loudspeaker of the narrow-band ring-type phase control subsystem with smaller distribution radius R is relatively short, so that the broadband ring-type phased array sound box system is suitable for phase control playing of high-frequency audio signals with relatively short wavelength; the distance between the loudspeakers of the narrow-band annular phase control subsystem with larger distribution radius R is longer, so that the system is suitable for phase control playing of low-frequency audio signals with longer wavelength; finally, the distances from the inner layer to the outer layer of each loudspeaker serving as a phased array element accord with a phased array theory, so that the main lobe sound wave beam pointing effect is effectively enhanced, and the scattering generated by side lobe beams is prevented; and the band-pass filtering effect of the primary DSP frequency division module on the audio of each channel is realized, the independent playing of the high-pitch and low-pitch frequency bands in each narrow-band annular phase control subsystem is realized, and finally, the wideband phase control sound waves with controllable directional of each frequency band are combined and emitted in the air.
The broadband ring-type phased array sound box system is different from a strip-type linear array pointing structure of a conventional phased array sound box, and each narrow-band ring-type phased array sound box system is arranged in concentric circles according to a point sound source theory, so that the equivalent sound source position of each narrow-band ring-type phased array sound box system can be approximately the center of the concentric circles; the MCU secondary control module and the DSP phase delay device module of each narrow-band annular phase control subsystem take the center of a concentric circle as zero phase reference, wave Cheng Cha and time delay parameters T of all loudspeakers distributed in an annular mode in a three-dimensional space at the center of the concentric circle are calculated one by one, and finally the time delay parameters T corresponding to the three-dimensional beam deflection of the designated space angles theta 1 and theta 2 are written into the MCU secondary control module and the DSP phase delay device module respectively, so that more accurate sound image effect and sound image positioning are obtained in playing environments such as a super-near field and a near field; and the deflection control effect of the main lobe beam can be realized in the vertical and horizontal directions by a three-dimensional coordinate transformation mode.
Drawings
FIG. 1 is a schematic diagram of a wideband ring phased array loudspeaker system according to the invention
FIG. 2 is a schematic diagram of a narrow band annular phase control subsystem according to the present invention
Fig. 3 is a schematic structural view of a speaker control unit module according to the present invention
Fig. 4 is a schematic plan view of a speaker arrangement of a narrowband annular phase control subsystem according to the present invention
FIG. 5 is a schematic diagram of phase delay control of a speaker of a narrow band annular phase control subsystem according to the present invention
FIG. 6 is a schematic diagram of beam deflection control of a narrowband annular phased subsystem in accordance with the present invention
FIG. 7 is a schematic view of three-dimensional direction of main lobe sound waves of the narrow-band annular phase control subsystem according to the present invention
FIG. 8 is a schematic view of the projection of the main lobe acoustic wave direction of the narrow band annular phase control subsystem in the X-O-Y plane
FIG. 9 is a schematic plan view of the subsystem configuration of the wideband ring phased array loudspeaker system of the invention
1. A broadband signal input module, 2, an ADC analog-to-digital conversion module, 3, a primary DSP frequency division module, 4, an MCU main controller module, 5, a narrow-band annular phase control subsystem, 6, a DSP phase delay module, 7, an MCU secondary control module, 8, a DA conversion module, 9, an AMP amplifying module, 10, a loudspeaker, 11, a loudspeaker control unit module, 12, a wave front, 13, a main lobe beam, 14, an annular phase control subsystem of a high-frequency band, 15, an annular phase control subsystem of an intermediate-frequency band, 16, an annular phase control subsystem of a low-frequency band
Detailed Description
For ease of illustration, a wideband ring phased array loudspeaker system according to the present invention is described below with reference to FIGS. 1-9. Like parts in the drawings are designated by the same or similar reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
Referring to fig. 1-3, in order to solve the above problems, an embodiment of the present invention provides a wideband ring type phased array speaker system, which includes a wideband signal input module 1 for accessing a wideband audio analog signal; an ADC analog/digital conversion module 2, configured to convert the wideband audio analog signal into a wideband audio digital signal; the primary DSP frequency dividing module 3 is used for carrying out band-pass filtering processing and dividing on the broadband audio digital signal conversion to obtain a plurality of paths of frequency-divided narrowband digital audio signals; the MCU main controller module 4 is used for controlling the band-pass filtering parameters and the frequency division quantity of the primary DSP frequency division module; a DSP phase delay module 6 for applying a time delay to the narrowband digital audio signal; the MCU secondary control module 7 is used for controlling the time delay parameter of the DSP phase delay module 6; a DA conversion module 8, configured to convert the narrowband digital audio signal into a narrowband audio analog signal; AMP amplification block 9 for amplifying the narrowband audio analog signal and driving speaker 10; and a speaker 10 for outputting the amplified narrowband audio signal as audible sound waves.
Wherein, the DSP phase delay module 6, the MCU secondary control module 7, the DA conversion module 8, and the AMP amplification module 9 together form a speaker control unit module 11, and each narrow-band annular phase control subsystem 5 includes the plurality of speakers 10 and the plurality of speaker control unit modules 11 that are uniformly arranged in an annular ring.
The embodiment further includes: the MCU secondary control module 7 forms an included angle theta with the polar axis of the loudspeaker plane according to the projection of the space deflection direction of the sound wave beam on the loudspeaker plane 1 Included angle theta between space deflection direction of sound wave beam and normal direction of loudspeaker plane 2 And the speaker distribution radius R calculates and adjusts the time delay parameter T of each DSP phase delay module 6.
The plurality of narrowband annular phase control subsystems 5 are arranged in concentric circles, and the number of speakers 10 contained in each narrowband annular phase control subsystem 5 is the same as the number of speaker control unit modules 11.
The wideband sound signal is divided into multiple audio signals with different frequency bands, and the frequency bands of the sound played by the plurality of narrowband annular phase control subsystems 5 are different. The smaller the distribution radius R of the speakers 10, the higher the sound frequency that the narrow-band annular-shaped phase control subsystem 5 is responsible for playing, and the larger the distribution radius R of the speakers 10, the lower the sound frequency that the narrow-band annular-shaped phase control subsystem 5 is responsible for playing.
Referring to fig. 4-8, taking a 1-group narrow-band annular phase control subsystem 5 formed by 12 speakers 10 and 12 speaker control unit modules 11 which are uniformly distributed in an annular ring as an example, taking the center of the circle where the speakers 10 are uniformly distributed in the annular ring as a coordinate origin O, taking the vertical direction of the front surface of the speakers 10 as a Z axis, and taking the plane where the speakers 10 are uniformly distributed in the annular ring as an X-O-Y plane, and establishing an X-Y-Z space rectangular coordinate system. The absolute value of the wave Cheng Cha of the deflected main lobe beam and the wave Cheng Cha of the same wave front 12 from the origin O of the loudspeaker 10 positioned on the positive half axis of the Y axis is:
in θ 1 The angle between the projection of the space deflection direction of the sound wave beam on the plane of the loudspeaker 10 and the polar axis of the plane of the loudspeaker 10 is limited to 0-360 degrees; θ 2 The included angle between the space deflection direction of the sound wave beam and the normal direction of the plane of the loudspeaker 10 is defined as 0-90 degrees, and R is the distribution radius of the loudspeaker 10.
It can be derived that the absolute value of the time delay T of the DSP phase delay module 6 in the speaker control unit module 11 corresponding to the speaker 10 is:
where c is the sonic velocity in air.
It should be noted that, in the embodiment, the calculation formula of the absolute value of the wave path difference and the calculation formula of the absolute value of the time delay are scalar parameters, if the wave path length of the main lobe beam 13 after deflection is greater than the wave path length from the origin O to the same wavefront 12, the actual time delay T takes a negative value, and the signal phase is advanced; if the path length of the deflected main lobe beam 13 is smaller than the path length from the origin O to the same wavefront 12, the actual time delay T takes a positive value, and the signal phase is delayed.
The same procedure can calculate the time delay T of the DSP phase delay module 6 in the main lobe beam 13 and the wave Cheng Cha from the origin O to the same wavefront 12 of the other speakers 10 one by one, and write the time delay T into the DSP phase delay module 6 through the corresponding MCU secondary control module 7, so that the corresponding speaker control unit module 11 of each speaker 10 generates a respective delay effect or phase advance effect, and finally the main lobe beam 13 generated by each speaker 10 generates a common wavefront 12.
Referring to fig. 9, a wideband ring-type phased array speaker system comprising three independent narrow-band ring-type phased array subsystems 5 is taken as an example, and the wideband ring-type phased array speaker system is divided into a ring-type phased array subsystem 14 in a high-frequency band, a ring-type phased array subsystem 15 in a medium-frequency band, and a ring-type phased array subsystem 16 in a low-frequency band. Wherein the annular phase control subsystem 14 of the high-frequency band is positioned at the inner ring position of the concentric circle, and receives the high-frequency signal from the primary DSP frequency division module 3, and the range of the audio signal is preferably 4000Hz-15000Hz; the annular phase control subsystem 15 of the intermediate frequency band is positioned in the concentric circle center position and receives the intermediate frequency signal from the primary DSP frequency division module 3, and the range of the intermediate frequency signal is preferably 1000Hz-4000Hz; the annular phase control subsystem 16 of the low frequency band is located at the outer concentric ring position and receives the low frequency signal from the primary DSP crossover module 3, preferably in the range of 250Hz-1000Hz.
Aiming at the existing problems at present, the invention provides a broadband ring type phased array sound box system, which adopts a plurality of narrow-band ring-shaped phase control subsystems 5 with different distribution radiuses R to respectively take charge of audio frequency bands with different center frequencies, and the distances between the loudspeakers 10 of the narrow-band ring-shaped phase control subsystem 5 with smaller distribution radiuses R are smaller, so that the broadband ring-shaped phased array sound box system is suitable for phase control playing of high-frequency audio signals with shorter wavelengths; the distance between the loudspeakers 10 of the narrow-band annular phase control subsystem 5 with larger distribution radius R is longer, so that the phase control playing is suitable for the low-frequency audio signals with longer wavelength; finally, the distances from the inner layer to the outer layer of each loudspeaker 10 as a phased array element accord with the phased array theory, the pointing effect of the main lobe beam 13 is effectively enhanced, and the scattering generated by the side lobe beam is prevented; and the band-pass filtering effect of the primary DSP frequency division module 3 on the audio of each channel is realized, the independent playing of the high-pitch and low-pitch frequency bands in each narrow-band annular phase control subsystem 5 is realized, and finally, the wideband phase control sound waves with controllable directional of each frequency band are combined and emitted in the air.
The broadband ring-type phased array sound box system is different from a strip-type linear array pointing structure of a conventional phased array sound box, and each narrow-band ring-type phased array sound box system 5 is arranged in concentric circles according to a point sound source theory, so that the equivalent sound source position of each narrow-band ring-type phased array sound box system 5 can be approximately the center of the concentric circles; the phase adjustment of the MCU secondary control module 7 and the DSP phase delay module 6 of each narrow-band annular phase control subsystem 5 takes the center of a concentric circle as a zero phase reference, so that waves Cheng Cha and time delay parameters T of the annular distributed speakers 10 in the three-dimensional space relative to the center of the concentric circle are calculated one by one, and finally the specified space angle theta is calculated 1 、θ 2 The time delay parameters T corresponding to the three-dimensional beam deflection are respectively written into each MCU secondary control module 7 and the DSP phase extender module 6, so that more accurate sound image effect and sound image positioning are obtained in the playing environments such as ultra-near field, near field and the like; and the deflection control effect of the main lobe beam 13 can be realized in the vertical and horizontal directions by a three-dimensional coordinate transformation mode, and the method has wide application prospect.
It should be apparent that the foregoing examples of the present invention are merely illustrative of the present invention and not limiting of the embodiments of the present invention, and that various other changes and modifications can be made by one skilled in the art based on the above description, and it is not intended to be exhaustive of all of the embodiments, and all obvious changes and modifications that come within the scope of the invention are still within the scope of the invention.
Claims (5)
1. A wideband ring phased array loudspeaker system comprising:
the broadband signal input module is used for accessing a broadband audio analog signal;
the ADC module is used for converting the broadband audio analog signal into a broadband audio digital signal;
the primary DSP frequency dividing module is used for carrying out band-pass filtering processing and dividing on the broadband audio digital signal conversion to obtain multiple paths of frequency-divided narrowband digital audio signals;
the MCU main controller module is used for controlling the band-pass filtering parameters and the frequency division quantity of the primary DSP frequency division module;
a DSP phase delay module for applying a time delay to the narrowband digital audio signal;
the MCU secondary control module is used for controlling the time delay parameter of the DSP phase delay module;
the DA conversion module is used for converting the narrow-band digital audio signal into a narrow-band audio analog signal;
an AMP amplification module for amplifying the narrowband audio analog signal and driving a speaker;
a speaker for outputting the amplified narrowband audio signal as audible sound waves;
the DSP phase delay device module, the MCU secondary control module, the DA conversion module and the AMP amplification module jointly form a loudspeaker control unit module, and each narrow-band annular phase control subsystem comprises a plurality of loudspeakers and a plurality of loudspeaker control unit modules which are uniformly arranged into an annular ring.
2. The wideband ring phased array loudspeaker system of claim 1, further comprising: the MCU secondary control module forms an included angle theta with the polar axis of the loudspeaker plane according to the projection of the sound wave beam space deflection direction on the loudspeaker plane 1 Included angle theta between space deflection direction of sound wave beam and normal direction of loudspeaker plane 2 LoudspeakerAnd calculating and adjusting the time delay parameters T of the DSP retarder modules by using the distribution radius R.
3. A wideband ring phased array loudspeaker system as claimed in claim 2, wherein the plurality of narrowband ring phase control subsystems are arranged in concentric circles, each narrowband ring phase control subsystem comprising the same number of loudspeakers as the number of loudspeaker control unit modules.
4. A wideband loop phased array loudspeaker system as claimed in claim 3, wherein the wideband sound signal is divided into a plurality of audio signals having different frequency ranges, and the plurality of narrowband loop phased control subsystems each have a different frequency range of sound.
5. The wideband ring phased array loudspeaker system of claim 4, wherein the narrower the speaker distribution radius R, the higher the frequency of sound that the narrowband ring phased array subsystem is responsible for playing.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117098045A (en) * | 2023-09-07 | 2023-11-21 | 广州市声拓电子有限公司 | Array loudspeaker system and implementation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117098045A (en) * | 2023-09-07 | 2023-11-21 | 广州市声拓电子有限公司 | Array loudspeaker system and implementation method |
| CN117098045B (en) * | 2023-09-07 | 2024-04-12 | 广州市声拓电子有限公司 | Array loudspeaker implementation method |
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