CN115776633B - Loudspeaker control method and system for indoor scene - Google Patents

Abstract

The invention discloses a loudspeaker control method and a loudspeaker control system for an indoor scene, which relate to the technical field of loudspeaker signal analysis, and the method comprises the steps of determining a target receiving area of an acoustic signal in the indoor scene and carrying out space segmentation on the indoor scene to obtain a plurality of alternative areas; acquiring first test sound signals from each candidate area to a target receiving area, analyzing reverberation characteristics of all the first test sound signals, and determining an initial placement area; determining at least one alternative point location in the initial placement area, sequentially placing a target loudspeaker in each alternative point location, and transmitting a third test sound signal after determining an angle adjustment strategy each time; the system is realized based on the method. The control method system carries out region selection according to a reverberation characteristic analysis mode aiming at an indoor scene, and places a target loudspeaker at a selection point for acoustic signal testing, so that the target receiving region can obtain better receiving quality in the aspect of acoustic signal physical propagation.

Description

Loudspeaker control method and system for indoor scene

Technical Field

The invention relates to the technical field of loudspeaker signal analysis, in particular to a loudspeaker control method and system for an indoor scene.

Background

With the popularization of intelligent sound boxes, the loudspeaker is visible everywhere in life as a sound energy device. The position of the loudspeaker determines the receiving quality of the sound signals, particularly in an indoor scene, the subjective feeling of a listener is obvious, if the loudspeaker is not placed in place, the listener cannot feel pleasurable, and the received sound signals are disordered and inconspicuous and appear obvious tone quality flaws and the like.

Although some methods for improving the sound quality of speakers have been proposed in the prior art, sound field control is only performed on the sound signals of the speakers, so that the listener can receive sound signals with better quality. The above approach ignores the influence of the position of the loudspeaker on the propagation of the acoustic signal, especially in terms of acoustic signal delay, additional reverberation, etc. caused by physical blocking, reflections, etc. Therefore, the control of the placement position of the speakers can effectively improve the reception quality of the acoustic signal from the aspect of physical propagation.

Disclosure of Invention

The invention aims to provide a loudspeaker control method system for an indoor scene, which carries out region selection according to a reverberation characteristic analysis mode aiming at the indoor scene and places a target loudspeaker at a position of the selected point for sound signal testing, thereby ensuring that a target receiving region can obtain better receiving quality in the aspect of sound signal physical transmission.

The embodiment of the invention is realized by the following steps:

in a first aspect, a method for controlling a speaker for an indoor scene includes the steps of: determining a target receiving area of an acoustic signal in an indoor scene, and performing space segmentation on the indoor scene to obtain a plurality of segmentation areas; screening the plurality of segmentation areas to obtain a plurality of alternative areas; acquiring first test sound signals from each alternative area to a target receiving area, performing reverberation characteristic analysis on all the first test sound signals, and determining an initial placement area based on the result of the reverberation characteristic analysis; wherein the first test acoustic signal is generated by a target speaker; determining at least one test point location in the initial placement area, transmitting a second test sound signal at each test point location, capturing the number of reflected signals of the second test sound signal for the first N times, and taking the test point location as an alternative point location if the number of the captured reflected signals is smaller than a preset threshold value, wherein the second test sound signal is generated by a target loudspeaker; n is a positive integer; and sequentially placing the target loudspeaker in each alternative point, transmitting a third test sound signal after determining an angle adjustment strategy each time, detecting the direct sound signal time and the reflected sound signal time of the third test sound signal to a target receiving area, and taking the angle as the control angle of the target loudspeaker if the difference between the direct sound signal time and the reflected sound signal time is less than 0.05 s.

In an alternative embodiment, the analysis of the reverberation characteristics of all the first test acoustic signals comprises the steps of: determining the reverberation time of the first test sound signal, judging whether the reverberation time is in a first interval, recording the first test sound signal as a check sound signal if the reverberation time is in the first interval, and otherwise, rejecting the first test sound signal; and acquiring the emission sound pressure grade and the receiving sound pressure grade of each check sound signal, substituting the emission sound pressure grade into the sound signal attenuation model to obtain the screening reduction sound pressure grade, and calculating the distance parameter between the screening reduction sound pressure grade and the receiving sound pressure grade.

In an optional embodiment, the emitting sound pressure levels and the receiving sound pressure levels of all the checked sound signals are obtained, and all the emitting sound pressure levels and the receiving sound pressure levels are fitted to obtain the sound signal attenuation model.

In an optional embodiment, after each test point location emits the second test acoustic signal, the method further comprises the following steps: obtaining direction parameters of all first reflected signals of the second test acoustic signal; performing orthogonality judgment on the obtained direction parameters to generate an initial orthogonality value; and eliminating the second test acoustic signals with the orthogonal initial values larger than the initial threshold value.

In an alternative embodiment, the orthogonality judgment includes the following steps: determining a reference reflection signal from all the first reflection signals, and acquiring the emission direction of the reference reflection signal on a first plane as a first reference emission direction; then acquiring the emission directions of other first reflection signals on the first plane as first secondary emission directions; and analyzing the condition of an included angle of each first secondary emission direction relative to the first reference emission direction as a basis for calculating an orthogonal initial value.

In an alternative embodiment, the emission direction of the reference reflection signal on the second plane is acquired as the second reference emission direction; then acquiring the emission direction of the rest of the first reflection signals on a second plane as a second secondary emission direction; analyzing the condition of an included angle of each second secondary ejection direction relative to the second reference ejection direction, and using the condition as the basis for calculating the orthogonal initial value; wherein the second plane is perpendicular to the first plane.

In an optional embodiment, the deviation correction coefficient is generated according to the number of the first secondary emission direction and/or the second secondary emission direction pointing to the target receiving area, and the deviation correction coefficient is given to the orthogonal initial value as the subtraction weight.

In an alternative embodiment, determining the angle adjustment strategy each time comprises the following steps: acquiring a first minimum value of a first reference shooting direction and any first secondary shooting direction and a second minimum value of a second reference shooting direction and any second secondary shooting direction; and comparing the first minimum value with the second minimum value, wherein the smaller one is used as a minimum unit for angle adjustment.

In an optional embodiment, the method further includes a step of determining that the third test acoustic signal is detected abnormally: determining a sample training set and a sample testing set, and carrying out model training; and recognizing the abnormal condition of the third test acoustic signal by using the trained model to obtain a recognition result.

In a second aspect, a speaker control system for an indoor scene includes:

the device comprises a first determining unit, a second determining unit and a third determining unit, wherein the first determining unit is used for determining a target receiving area of an acoustic signal in an indoor scene and performing space division on the indoor scene to obtain a plurality of divided areas; screening the plurality of divided regions to obtain a plurality of alternative regions;

the first screening unit is used for acquiring first test sound signals from each candidate area to the target receiving area, performing reverberation characteristic analysis on all the first test sound signals, and determining an initial placement area based on the result of the reverberation characteristic analysis; wherein the first test acoustic signal is generated by a target speaker;

the second screening unit is used for determining at least one test point location in the initial placement area, emitting a second test sound signal at each test point location, capturing the number of reflected signals of the second test sound signal for the first N times, and taking the test point potential as an alternative point location if the number of the captured reflected signals is smaller than a preset threshold, wherein the second test sound signal is generated by a target loudspeaker; n is a positive integer;

the first control unit is used for placing the target loudspeaker in each alternative point position in sequence, determining an angle adjustment strategy each time, then transmitting a third test sound signal, and detecting the direct sound signal time and the reflected sound signal time of the third test sound signal to a target receiving area;

a first judgment unit for realizing the following judgment: and if the difference between the time of the direct sound signal and the time of the reflected sound signal is less than 0.05s, taking the angle as the control angle of the target loudspeaker.

The embodiment of the invention has the beneficial effects that:

according to the loudspeaker control method and system for the indoor scene, provided by the embodiment of the invention, the indoor scene is divided, a plurality of alternative areas are obtained, then the reverberation characteristic of each alternative area is analyzed, and an initial placement area with higher sound signal receiving quality on the physical level is determined based on the result of the reverberation characteristic analysis; and then testing the sound signals of the test point positions in the initial placement area, wherein on one hand, the number of the reflected signals of the sound signals at the point positions is tested, the test point positions with a small number are selected as alternative point positions, on the other hand, the test of the propagation path of the target loudspeaker is carried out at the alternative point positions, and at least one angle capable of being used as placement control is obtained, so that the placement control operation of the target loudspeaker in an indoor scene is completed.

In summary, the method and the system for controlling the loudspeaker for the indoor scene according to the embodiments of the present invention select the candidate region by considering the reverberation effect, and select the candidate point and the placement angle by determining whether the intelligibility is low or whether an echo is generated, so that an adjustment strategy for high-quality reception of an acoustic signal can be obtained through a series of reference indexes in physical transmission, and finally a target receiving region can receive the acoustic transmission signal from a physical layer with high quality.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a flowchart illustrating major steps of a speaker control method according to an embodiment of the present invention;

FIG. 2 is a flow chart of sub-steps of one step S200 of the main steps shown in FIG. 1;

FIG. 3 is a flow chart of sub-steps of a step S500 of the main steps shown in FIG. 1;

fig. 4 is a flowchart illustrating major steps of a speaker control method according to another embodiment of the present invention;

FIG. 5 is a flow chart of sub-steps of one step S600 of the main steps shown in FIG. 4;

fig. 6 is an exemplary block diagram of a system 700 for receiving station position determination according to an embodiment of the present invention.

Detailed description of the preferred embodiments

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be understood that "system," "device," and/or "module" as used herein is a method for distinguishing different components, elements, components, parts, or assemblies at different levels. However, other words may be substituted by other expressions if they accomplish the same purpose.

As used herein and in the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.

Flow charts are used in the present invention to illustrate the operations performed by a system according to embodiments of the present application. It should be understood that the preceding or following operations are not necessarily performed in the exact order in which they are performed. Rather, the steps may be processed in reverse order or simultaneously. Meanwhile, other operations may be added to the processes, or a certain step or operations may be removed from the processes.

Examples

The placement positions of the flat-type, wall-mounted and lying-type sound boxes are more and more elaborated, and particularly, the placed sound boxes cannot be adjusted and controlled strategically, so that the purpose of improving the sound quality receiving quality is achieved. In order to solve the problem that the high-quality receiving of the sound signals is achieved from the electromagnetic signal layer only by controlling the sound field of the sound signals, and the aspect of receiving the high-quality signals for the physical propagation layer is ignored, so that a control layer capable of being further improved always exists for receiving the sound signals. Referring to fig. 1, a method for controlling a speaker for an indoor scene according to the present embodiment includes the following steps:

s100: determining a target receiving area of an acoustic signal in an indoor scene, and performing space segmentation on the indoor scene to obtain a plurality of segmentation areas; and screening the plurality of segmentation areas to obtain a plurality of candidate areas. Firstly, determining the position where a listener regularly receives acoustic signals as a target receiving area; dividing an indoor scene, wherein the division principle is to divide the indoor scene by taking a plane map as a reference to obtain a plurality of vertically presented three-dimensional spaces, and the division mode is, for example, an average equal grid division mode, and is also, for example, a mode of dividing based on a heat map, and areas displayed by different grades of heat are taken as separate areas; for example, the division is performed by using the degree of physical obstruction, that is, the division is performed according to the fact that the region includes at least one and at most three through holes (gaps communicating with the rest of the regions) on the plane.

The present embodiment is explained in a manner of grid-type division, and each obtained grid is used as a division region, and each division region is a columnar space parallel to each other (vertically presented). And further screening all the segmentation areas to remove invalid or undesirable areas so as to obtain a plurality of candidate areas. The screening method is to remove areas with high environmental noise and areas with difficult physical propagation, such as windows or doors, areas where other sound energy devices are placed, areas with three walls surrounding and small openings, and the like, so as to obtain areas with normal and qualified sound signal propagation in terms of physical propagation.

A first round of test, namely, a reverberation characteristic analysis test, is performed on the candidate region obtained after the preliminary screening, and step S200 is performed: acquiring first test sound signals from each candidate area to the target receiving area, performing reverberation characteristic analysis on all the first test sound signals, and determining an initial placement area based on the result of the reverberation characteristic analysis; wherein the first test acoustic signal is generated by a target speaker. The method comprises the steps of analyzing a first test sound signal generated by a target loudspeaker, namely a loudspeaker needing to be adjusted, carrying out initial propagation on the sound signal in each alternative region, then carrying out ordered reception on the first test sound signal in a target receiving region, finally carrying out reverberation characteristic analysis on the first test sound signal propagated to different alternative regions each time, and determining an initial placement region from all the alternative regions according to the final reverberation characteristic analysis result.

Through the technical scheme, the initial placement area where the target loudspeaker can be placed is determined by using the reverberation effect, and the target receiving area can receive high-quality sound signals from the initial level. It should be noted that, the reverberation characteristic analysis mainly analyzes the reverberation time of the acoustic signal, and since the reverberation time is an important index of the acoustic quality reference coefficient, a qualified reverberation time range needs to be obtained in the indoor environment, so that an indoor sound field with a good acoustic quality effect can be achieved. The reverberation is the attribute with the highest frequency in the acoustic field, and after the sound source continuously occurs for a period of time, the sound source is cut off after the absorption energy and the emission energy of the sound wave reach a dynamic balance, and the acoustic effect still exists in a certain time. The presence of reverberation gives a sense of stereo from the auditory sense, and thus, controlling the appropriate reverberation time can improve the quality level of the sound in the room. In the former mode, for example, the reverberation time is changed or prolonged by optimizing the frequency characteristic of the reverberation time, and for example, acoustic components convenient for conversion are installed on a part of wall surface and ceiling, or various indexes of indoor sound quality are flexibly controlled and adjusted by electroacoustic control.

The above-described manner of adjusting the reverberation time indicates the importance of the influence of the reverberation time on the sound quality in the room. In this embodiment, referring to fig. 2, the analyzing the reverberation characteristics of all the first test acoustic signals includes the following steps:

s210: and determining the reverberation time of the first test sound signal, judging whether the reverberation time is in a first interval, marking the first test sound signal as a check sound signal if the reverberation time is in the first interval, and rejecting the first test sound signal if the reverberation time is not in the first interval. This step determines the further operation by obtaining the reverberation time of each first test acoustic signal and determining the reverberation time range, for example, the reverberation time range, i.e. the first interval, is 0.5 to 1.5 seconds, and of course, the adaptive adjustment of the first interval may be performed according to the actual scene size in different time modes, but generally, the range of the first interval is within 0.03 to 5 seconds. Taking the first interval as 0.5-1.5 seconds as an example, if the reverberation time of the received first test sound signal is determined to be within the interval, the received first test sound signal is marked as a check sound signal, and waiting for further determination, if the reverberation time of the received first test sound signal is determined not to be within the interval, the received first test sound signal is rejected, and the corresponding alternative area is also rejected, so that the purpose of screening the alternative area in the second step is achieved.

A further determination is made as to the check sound signal falling in the first section, that is, step S220 is performed: and acquiring the emission sound pressure grade and the receiving sound pressure grade of each check sound signal, substituting the emission sound pressure grade into an acoustic signal attenuation model, and acquiring the screening reduction sound pressure grade. This step indicates that sound pressure determination is continued on the first test sound signal that has been determined to be acceptable after the reverberation time determination, and is intended to ensure that the sound pressure level cannot be attenuated too quickly or severely attenuated even if the reverberation time is determined to be acceptable, resulting in a severe loudness reduction even though the sound quality is improved. Through the technical scheme, the transmitting sound pressure grade and the receiving sound pressure grade of the checked sound signals are compared, whether the phenomenon that the sound signal energy value is seriously attenuated exists is further discriminated, wherein the sound signal attenuation model can be a calculation model for measuring the sound energy through a sensor, and the calculation model is realized by adopting a maximum likelihood method, an energy circle crossing method or a least square method. In this embodiment, a regression fitting manner is adopted to construct a model, that is, the emission sound pressure levels and the reception sound pressure levels of all the check sound signals are obtained, and all the emission sound pressure levels and the reception sound pressure levels are fitted to obtain the sound signal attenuation model. Through the method, the rules of the emission sound pressure level and the receiving sound pressure level of all the checked sound signals to be tested can be found in the current testing environment, so that the regression model built through fitting can exclude error factors outside the testing environment, and the environment matching performance is stronger.

S230: and calculating a distance parameter between the screening reduction sound pressure grade and the receiving sound pressure grade. After the sound signal attenuation model is obtained, the checked sound signals to be tested are substituted into the model, the screened sound pressure reduction grade calculated theoretically is obtained, then the screened sound pressure reduction grade is compared with the actually detected received sound pressure grade, namely, the difference degree is known by judging the numerical distance between the screened sound pressure reduction grade and the actually detected received sound pressure grade, the checked sound signals with overlarge differences are removed, and therefore the purpose of screening the alternative area in the third step is achieved. Through the technical scheme, the check sound signal with the minimum difference between the final screening sound pressure level and the received sound pressure level can be effectively selected, and the alternative area corresponding to the check sound signal is used as the initial placement area and also represents the initial placement area determined based on the optimal result of the reverberation characteristic analysis.

After the initial placement area is determined, the actual size of the area may be large or small, for example, the area is larger as the grid is selected to be larger, and in some embodiments, the initial placement area may be a plurality of very similar characteristic areas, which may be used as the area where the target speaker is placed, and no matter how many the placement areas are, a specific placement point needs to be selected for each initial placement area, that is, step S300 is performed: determining at least one test point location in the initial placement area, emitting a second test sound signal at each test point location, capturing the number of reflected signals of the second test sound signal for the first N times, and taking the potential of the test point as an alternative point location if the number of the captured reflected signals is smaller than a preset threshold, wherein the second test sound signal is generated by a target loudspeaker; n is a positive integer. In this step, first, one or more placement points are determined in an initial placement area, for example, when the floor area of the initial placement area is large, the number of placement points can be increased by a proper amount, that is, the number of placement points changes in direct proportion to the floor area of the initial placement area, for example, 10 to 50.

In this embodiment, the number of reflected signals obtained by the second test acoustic signal is used as a screening criterion, that is, a criterion for screening a specific point location in the fourth step. In an indoor scene, sound touches a wall and is easy to reflect for multiple times, and various sound waves are overlapped and interfered with each other after being reflected, so that the sound quality, particularly the definition, is seriously influenced, and whether the sound waves are subjected to multiple times of disordered transmission needs to be further judged. It should be noted that the second test acoustic signal is also generated by the target speaker, the target speaker is sequentially placed at each test point location, the first N times of reflected signals in the second test acoustic signal generated by the target speaker in each test point location are captured, for example, the first three times of reflected signals are captured, and finally, the number of reflected signals generated by the second test acoustic signal at the test point location is counted to represent whether the point location can generate a relatively clear acoustic receiving signal.

After multiple reflections, the sound can be delayed to be reverberant sound, so that the sound quality of orderly reflected sound signals can be enhanced. In order to realize the detection of the number of the reflected signals generated by the second test acoustic signal in the fourth step, the condition of orderly reflection is not eliminated in advance, and the rationality of test point position screening is increased. After each of the test site locations emits the second test acoustic signal, the following steps S310-S330 are also included (this group of steps may be performed before or after the number of N times of reflected signals before capturing the second test acoustic signal):

s310: obtaining direction parameters of all first reflected signals of the second test acoustic signal; this step represents to judge the directions of all first reflected signals of the second test sound signal, i.e. to obtain the directions of all first transmitted signals of the second test sound signal except the direct sound, and then to perform step S320: performing orthogonality judgment on the obtained direction parameters to generate an initial orthogonality value; that is, the orthogonality determination is performed on all directions of the primary reflection signals, the orthogonality is represented in a numerical manner, and the point with better orthogonality is further removed, that is, the step S330 is performed: and eliminating the second test acoustic signals with the orthogonal initial values larger than the initial threshold value. Through above technical scheme, can reject the crossing mixed and disorderly point location of first reflection signal among the second test acoustic signal of test, the acoustic signal definition that this test point location produced promptly is lower, and less and the more unanimous test point location of reflection direction of the condition of will intersecting remain, carries out subsequent test to reach the clear purpose of guaranteeing the acoustic signal propagation.

The above-mentioned orthogonality initial value represents the intersection of the directivities of all the first-reflected signals, and since some signals are in the intersection of different planes, in order to make the determination more directly, in this embodiment, the orthogonality determination includes the following steps S321 to S323:

s321: determining a reference reflection signal from all the first reflection signals, and acquiring the emission direction of the reference reflection signal on a first plane as a first reference emission direction; this step means that a reference reflection signal is determined from all the first reflection signals, and the determination rule may be a random determination or a concentration determination. Taking random determination as an example, step S322 is performed: then acquiring the emitting directions of other first reflection signals on the first plane as first secondary emitting directions; this step represents determining the emitting directions of the remaining first-time reflected signals in the same plane, so as to facilitate the judgment of the orthogonality, i.e. performing step S323: analyzing the condition of an included angle of each first secondary ejection direction relative to the first reference ejection direction, and using the condition as the basis for calculating the orthogonal initial value; the step is to obtain the included angle values of all the other first reflection signals and the first reflection signals on the first plane, each included angle is represented by a numerical value as the basis for calculating the orthogonal initial value, such as the basis for summation calculation, or as the basis for equalization, taking summation calculation as an example, all included angles are added to obtain the orthogonal initial value, and the larger the orthogonal initial value is, the more the first reflection signals at the test point intersect with each other relatively disorderly, and the phenomenon of reducing the definition of the acoustic signals is more easily generated.

Considering the case that the propagation direction of the acoustic signal is vector and the orthogonal initial value calculated in the first plane is only one projection direction, in order to improve the reasonable degree of the calculation of the orthogonal initial value, the method further includes the following steps S324-S326:

s324: and acquiring the emission direction of the reference reflection signal on a second plane as a second reference emission direction, wherein the second plane is perpendicular to the first plane. Similarly, this step represents the determination from the other plane, and the projection of the reference reflection signal on the two planes can be obtained by the second plane being perpendicular to the first plane, so that the directivity of the reference reflection signal can be more reasonably represented.

S325: then acquiring the emission direction of the rest of the first reflection signals on a second plane as a second secondary emission direction; similarly, the remaining first reflected signals are represented on the second plane, and then step S326 is performed: analyzing the condition of an included angle of each second secondary emission direction relative to the second reference emission direction to serve as a basis for calculating the orthogonal initial value, wherein a summation mode can be used as the basis for the orthogonal initial value, and then the summation values respectively calculated by the two planes are mutually combined; for example, the combination may be a sum combination, or a weight combination may be separately given, for example, if the sum value of the first plane and the sum value of the second plane are each 50% as a basic weight, and when there is a height difference between the source and the sink, the weight of the plane that is relatively vertical may be appropriately increased, and in a real-time scenario, the second plane may be a vertical plane, and the weight may be given to 70% or more, because the ceiling has the largest influence on the sound quality, and after being excessively mixed in this direction, a phenomenon of resonance coloration and sound quality degradation is likely to occur.

In an actual detection scene, because some first reflection signals can be directly reflected to a target receiving area, the type of the reflection sound signals belongs to effective reflection sound signals, and a coordinated sound receiving effect can be formed after absorption and reflection, the first reflection signals of the type need to be reserved, namely, elimination or noise reduction is carried out when an orthogonal initial value is calculated, so that the calculation of the orthogonal initial value is more reasonable. Namely, in the present embodiment, step S327 is performed: and generating a deviation correction coefficient according to the number of the first secondary ejection direction and/or the second secondary ejection direction pointing to the target receiving area, and giving the deviation correction coefficient as a subtraction weight to the orthogonal initial value. Through the above technical solution, it means that the fifth screening test is performed, after the orthogonality condition of several planes (the first plane and/or the second plane) is determined, the secondary emission direction pointing to (meaning that the direction passes through the target receiving area) the target receiving area is subjected to quantity statistics, and the secondary emission direction is increased in the calculated value every time, so that the final orthogonal initial value is subtracted, and certainly, in different embodiments, the effective primary reflection signal can be removed from the orthogonal initial value by an equal proportion removal or progressive subtraction mode, and the method is not limited herein.

Through the above step S300, one or more candidate points that are relatively reasonable and reliable can be obtained from all the test points, and then the target speaker angle is controlled and adjusted based on the candidate points, that is, steps S400 and S500 are performed.

S400: sequentially placing a target loudspeaker in each alternative point position, determining an angle adjustment strategy each time, then transmitting a third test sound signal, and detecting the time of a direct sound signal and the time of a reflected sound signal from the third test sound signal to the target receiving area; this step represents placing the target speaker in the candidate point location for the sixth step of testing to detect whether there is an obvious echo condition. The third test sound signal is also generated by the target speaker, and after the target speaker is adjusted by a certain angle each time, the difference between two sound signals at the receiving position of the target speaker, namely the difference between the time of the direct sound signal and the time of the reflected sound signal, is detected and is judged through the step S500: and if the difference between the time of the direct sound signal and the time of the reflected sound signal is less than 0.05s, taking the angle as the control angle of the target loudspeaker. Through the technical scheme, whether the obvious echo phenomenon exists in the alternative point position or not can be judged in the last step, if the obvious echo phenomenon does not exist in the alternative point position, the alternative point position and the placing angle are recorded and used as one of the adjustment targets of the target loudspeaker, corresponding adjustment can be selected under different scenes, for example, an intelligent sound box with a rotating or swinging function loads an angle adjustment strategy into an internal control program, the angle can be converted into the angle in a periodic motion, and therefore the high sound signal receiving quality can be guaranteed in the whole periodic process.

Because effective delay time does not exist between the direct sound and the emitted sound, the strength of the sound level heard is enhanced, however, if the time difference between the reflected sound and the direct sound in the sound field is too large due to the addition of the shielding object, an echo effect can be formed, and if the difference between the time of the direct sound signal and the time of the reflected sound signal is less than 0.05s, the reflected sound signal does not have an obvious delay phenomenon and can be used as a reverberation effect to achieve the effect of improving the sound quality.

It should be noted that, to obtain a reasonable and effective number of control angles of the target speakers, a suitable angle adjustment strategy needs to be selected, and referring to fig. 3, the determining the angle adjustment strategy each time includes the following steps S510 to S30:

s510: acquiring a first minimum value of the first reference emission direction and any first secondary emission direction; s520: a second minimum value of the second reference emission direction and any one of the second secondary emission directions; s530: and comparing the first minimum value with the second minimum value, and taking the smaller of the first minimum value and the second minimum value as a minimum unit of the angle adjustment. Through above technical scheme to the less one in first minimum and the second minimum is as angle adjustment unit at every turn, can carry out the sixth step test when sound signal change is great at every turn, can not appear dividing and cause more calculation burdens behind the unit undersize, adjusts with the minimum node that sound signal takes place obvious change simultaneously, and not only quantity is reasonable, can not omit every node that takes place obvious change in addition, reaches the better purpose of test validity. Of course, after the minimum unit of angle adjustment is determined each time, horizontal adjustment may be selected for the direction of angle adjustment, and a plane where a connection line between a sound source and a receiving source is located may be used as the adjustment direction in this embodiment.

Through the six steps of tests, better point positions and angles can be selected from the physical propagation layer to ensure higher receiving quality, and on the basis, the seventh step of test, namely the test of abnormal sound signals, is performed, so that the aim of ensuring higher-quality receiving of the sound signals is fulfilled. Referring to fig. 4 and 5, after the step S500, a step S600 of determining an abnormality of the third test acoustic signal is further included, where the step S600 specifically includes the following sub-steps S610 to S620:

s610: determining a sample training set and a sample testing set, and performing model training; the method mainly comprises the steps of dividing collected data into sample sets, wherein the collected data mainly come from measured data or historical data, preprocessing the data and dividing the data into two independent sample sets, namely a sample training set and a sample testing set, and then performing model training, wherein the most important is to select a training algorithm, such as algorithms of decision trees, random forests and the like. In the embodiment, an algorithm of the support vector machine can be adopted, and the algorithm of the support vector machine has better generalization capability on a plurality of classification tasks, namely the support vector machine has better identification effect on samples which are difficult to distinguish by searching for the separation hyperplane with the largest geometric interval. The following principles may be specifically referred to:

take training sample set D as an example, wherein

Then, a hyperplane for division is found, and the hyperplane is expressed as follows:

（1）

in the formula (1), the first and second groups,

represents the normal vector, and b represents the distance of the hyperplane from the origin. x is a point in sample space whose distance from the hyperplane is expressed as follows:

（2）

the definition that enables the hyperplane to correctly classify samples is as follows:

（3）

according to the above formulas (1) to (3), when

At this time, the distance between the sample point and the hyperplane is minimum, and the interval between the two types of points is represented as follows:

（4）

if the generalization capability of the hyperplane is maximized, the spacing should be maximized, which can be expressed as follows:

（5）

as can be seen from equations (4) and (5), if the interval is maximized, it should be made

At maximum, can be equivalently made

And is minimal. Then equation (5) can be equivalent to:

（6）

the point where the equation holds true in the constraint satisfied by equation (6) is closest to the separating hyperplane (w, b), and this type of point becomes the support vector. Support vectors are distributed in

On a hyperplane of (c), a separating hyperplane is located->

At the very center of (c). Aiming at more complicated nonlinear problems, in order to be suitable for the method, a kernel function can be introduced, and the kernel function carries out nonlinear transformation on input from low dimensionAnd mapping to a high-dimensional linear space, so as to solve in the high-dimensional linear space, which is not described in detail herein.

S620: and (5) recognizing the abnormal condition by using the trained model to obtain a recognition result. The step is mainly to apply the trained model, substitute the actually measured loudspeaker signal parameters into the model, and judge whether the abnormal condition exists according to the recognition result. Through the technical scheme, the abnormity of the target loudspeaker acoustic signal can be identified in the seventh step, so that the target receiving area can receive the acoustic signal with higher quality from both the physical propagation layer and the electromagnetic signal layer.

Please refer to the schematic block diagram of the speaker control system 700 for indoor scene in fig. 6, which is mainly used for dividing the functional blocks of the speaker control system 700 for indoor scene according to the foregoing method embodiment. For example, each functional module may be divided, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that the division of the modules in the present invention is illustrative, and is only a logical function division, and there may be another division manner in actual implementation. For example, in the case of dividing each function module according to each function, fig. 6 is a schematic system/apparatus diagram, wherein the speaker control system 700 for an indoor scene may include a first determining unit 710, a first screening unit 720, a second screening unit 730, a first control unit 740, and a first determining unit 750. The functions of the respective unit modules are explained below.

The first determining unit 710 is configured to determine a target receiving area of an acoustic signal in an indoor scene, and perform spatial segmentation on the indoor scene to obtain a plurality of segmented areas; and screening the plurality of the segmentation areas to obtain a plurality of candidate areas. The first screening unit 720 is configured to obtain first test acoustic signals from each candidate region to the target receiving region, perform reverberation characteristic analysis on all the first test acoustic signals, and determine an initial placement region based on a result of the reverberation characteristic analysis; wherein the first test acoustic signal is generated by a target speaker. The second screening unit 730 is configured to determine at least one test point location in the initial placement area, emit a second test acoustic signal at each test point location, capture the number of reflected signals N times before the second test acoustic signal, and if the number of captured reflected signals is smaller than a preset threshold, take the test point location as an alternative point location, where the second test acoustic signal is generated by a target speaker; n is a positive integer. The first control unit 740 is configured to sequentially place a target speaker in each of the candidate points, determine an angle adjustment strategy each time, transmit a third test sound signal, and detect a direct sound signal time and a reflected sound signal time of the third test sound signal to the target receiving area. The first judgment unit 750 is configured to realize the following judgment: and if the difference between the time of the direct sound signal and the time of the reflected sound signal is less than 0.05s, taking the angle as the control angle of the target loudspeaker.

In some embodiments, the first screening unit 720 is further configured to determine a reverberation time of the first test sound signal, determine whether the reverberation time is within a first interval, mark the first test sound signal as a check sound signal if the reverberation time is within the first interval, and reject the first test sound signal if the reverberation time is not within the first interval; and acquiring the transmitting sound pressure grade and the receiving sound pressure grade of each checked sound signal, substituting the transmitting sound pressure grade into an acoustic signal attenuation model to acquire a screening sound pressure grade, and calculating the distance parameter between the screening sound pressure grade and the receiving sound pressure grade.

In some embodiments, the second screening unit 730 is further configured to obtain the direction parameters of all first reflection signals of the second test acoustic signal; judging the orthogonality of the obtained direction parameters to generate an orthogonal initial value; and eliminating the second test acoustic signals with the orthogonal initial values larger than the initial threshold value. The second screening unit 730 is further configured to determine a reference reflection signal from all the first reflection signals, and obtain an emitting direction of the reference reflection signal on the first plane as a first reference emitting direction; then acquiring the emission directions of other first reflection signals on the first plane as first secondary emission directions; and analyzing the condition of an included angle between each first secondary ejection direction and the first reference ejection direction to serve as a basis for calculating the orthogonal initial value. The reference reflection signal is used for being reflected on a first plane and used as a reference reflection signal; then acquiring the emission direction of the rest of the first reflection signals on a second plane as a second secondary emission direction; analyzing the condition of an included angle of each second secondary ejection direction relative to the second reference ejection direction, and using the condition as a basis for calculating the orthogonal initial value; wherein the second plane is perpendicular to the first plane. And the deviation rectifying device is also used for generating deviation rectifying coefficients according to the quantity of the first secondary emission direction and/or the second secondary emission direction pointing to the target receiving area, and endowing the deviation rectifying coefficients to the orthogonal initial values as subtraction weights.

In some embodiments, the first control unit 740 is further configured to obtain a first minimum value of the first reference emitting direction and any of the first secondary emitting directions and a second minimum value of the second reference emitting direction and any of the second secondary emitting directions; and comparing the first minimum value with the second minimum value, and taking the smaller of the first minimum value and the second minimum value as a minimum unit of the angle adjustment.

The loudspeaker control system 700 for indoor scene provided in this embodiment further includes a first anomaly detection unit, configured to determine a sample training set and a sample test set, and perform model training; and identifying the abnormal condition of the third test acoustic signal by using the trained model to obtain an identification result.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, 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 instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optics, speaker-controlled power supply (DSL) for indoor scenes), or wireless (e.g., infrared, wireless, microwave, etc.) means. 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, a data center, etc., that includes one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), among others.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

Claims (10)

1. A method for controlling a loudspeaker for an indoor scene, comprising the steps of:

determining a target receiving area of an acoustic signal in an indoor scene, and performing space segmentation on the indoor scene to obtain a plurality of segmentation areas; screening the plurality of segmentation areas to obtain a plurality of alternative areas;

acquiring first test sound signals from each candidate area to the target receiving area, performing reverberation characteristic analysis on all the first test sound signals, and determining an initial placement area based on the result of the reverberation characteristic analysis; wherein the first test acoustic signal is produced by a target speaker;

determining at least one test point location in the initial placement area, emitting a second test sound signal at each test point location, capturing the number of reflected signals of the second test sound signal for the first N times, and taking the test point location as an alternative point location if the number of the captured reflected signals is smaller than a preset threshold value, wherein the second test sound signal is generated by a target loudspeaker; n is a positive integer;

and sequentially placing a target loudspeaker in each alternative point position, transmitting a third test sound signal after determining an angle adjustment strategy each time, detecting the time of a direct sound signal and the time of a reflected sound signal of the third test sound signal to the target receiving area, and taking the angle as the control angle of the target loudspeaker if the difference between the time of the direct sound signal and the time of the reflected sound signal is less than 0.05 s.

2. The method of controlling a loudspeaker for an indoor scene according to claim 1, wherein the analyzing the reverberation characteristic of all the first test sound signals includes the steps of:

determining the reverberation time of the first test sound signal, judging whether the reverberation time is in a first interval, recording the first test sound signal as a check sound signal if the reverberation time is in the first interval, and otherwise, rejecting the first test sound signal; and acquiring the emission sound pressure grade and the receiving sound pressure grade of each check sound signal, substituting the emission sound pressure grade into an acoustic signal attenuation model to obtain a screened sound pressure grade, and calculating the distance parameter between the screened sound pressure grade and the receiving sound pressure grade.

3. The method of controlling a speaker for an indoor scene according to claim 2, wherein the emission sound pressure level and the reception sound pressure level of all the check sound signals are obtained, and the sound signal attenuation model is obtained by fitting all the emission sound pressure levels and the reception sound pressure levels.

4. The method for controlling a loudspeaker for an indoor scene according to claim 1, further comprising the following steps after each of the test points emits the second test sound signal:

obtaining direction parameters of all first reflected signals of the second test acoustic signal; performing orthogonality judgment on the obtained direction parameters to generate an initial orthogonality value; and eliminating the second test acoustic signals with the orthogonal initial values larger than the initial threshold value.

5. The method of controlling a speaker for an indoor scene according to claim 4, wherein the orthogonality judgment includes the steps of:

determining a reference reflection signal from all the first reflection signals, and acquiring the emission direction of the reference reflection signal on a first plane as a first reference emission direction; then acquiring the emitting directions of other first reflection signals on the first plane as first secondary emitting directions; and analyzing the condition of an included angle between each first secondary ejection direction and the first reference ejection direction to serve as a basis for calculating the orthogonal initial value.

6. The method of controlling a speaker for an indoor scene according to claim 5, wherein an emission direction of the reference reflected signal on a second plane is acquired as a second reference emission direction; then acquiring the emission direction of the rest of the first reflection signals on a second plane as a second secondary emission direction; analyzing the condition of an included angle of each second secondary ejection direction relative to the second reference ejection direction, and using the condition as the basis for calculating the orthogonal initial value; wherein the second plane is perpendicular to the first plane.

7. The method of claim 6, wherein a rectification coefficient is generated according to the number of the first secondary emission direction and/or the second secondary emission direction pointing to the target receiving area, and the rectification coefficient is given to the orthogonal initial value as a subtraction weight.

8. The method of controlling speakers for indoor scenes of claim 7, wherein the determining the angle adjustment strategy each time comprises the steps of:

acquiring a first minimum value of the first reference shooting direction and any first secondary shooting direction and a second minimum value of the second reference shooting direction and any second secondary shooting direction; and comparing the first minimum value with the second minimum value, and taking the smaller of the first minimum value and the second minimum value as a minimum unit of the angle adjustment.

9. The method of controlling a speaker for an indoor scene according to claim 1, further comprising a step of determining abnormality detection of the third test sound signal:

determining a sample training set and a sample testing set, and performing model training; and recognizing the abnormal condition of the third test acoustic signal by using the trained model to obtain a recognition result.

10. A speaker control system for an indoor scene, comprising:

a first determining unit, configured to determine a target receiving area of an acoustic signal in an indoor scene, and perform spatial segmentation on the indoor scene to obtain a plurality of segmented areas; screening the plurality of segmentation areas to obtain a plurality of alternative areas;

the first screening unit is used for acquiring first test sound signals from each candidate area to the target receiving area, performing reverberation characteristic analysis on all the first test sound signals, and determining an initial placement area based on the result of the reverberation characteristic analysis; wherein the first test acoustic signal is produced by a target speaker;

the second screening unit is used for determining at least one test point location in the initial placement area, emitting a second test sound signal at each test point location, capturing the number of reflected signals of the second test sound signal for the first N times, and taking the test point location as an alternative point location if the number of the captured reflected signals is smaller than a preset threshold value, wherein the second test sound signal is generated by a target loudspeaker; n is a positive integer;

the first control unit is used for sequentially placing a target loudspeaker in each candidate point, determining an angle adjustment strategy each time, then transmitting a third test sound signal, and detecting the direct sound signal time and the reflected sound signal time of the third test sound signal to the target receiving area;

a first judgment unit for realizing the following judgment: and if the difference between the time of the direct sound signal and the time of the reflected sound signal is less than 0.05s, taking the angle as the control angle of the target loudspeaker.

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