CN112511962A - Control method of sound amplification system, sound amplification control device and storage medium - Google Patents
Control method of sound amplification system, sound amplification control device and storage medium Download PDFInfo
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- CN112511962A CN112511962A CN202110136889.6A CN202110136889A CN112511962A CN 112511962 A CN112511962 A CN 112511962A CN 202110136889 A CN202110136889 A CN 202110136889A CN 112511962 A CN112511962 A CN 112511962A
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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
- H04R27/00—Public address systems
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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
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/004—Monitoring arrangements; Testing arrangements for microphones
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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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones
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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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
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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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
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Abstract
The invention discloses a control method of a sound amplifying system, which comprises the following steps: when a debugging instruction is received, sequentially controlling each loudspeaker to emit white noise; acquiring a volume value picked up by each microphone when each loudspeaker emits the white noise; and determining the target volume output proportion of each microphone corresponding to each loudspeaker according to the volume value picked up by each microphone when each loudspeaker emits the white noise. The invention also discloses a control device of the sound amplification system and a storage medium. According to the invention, the target volume output proportion ensures that when each loudspeaker in the system normally works, the sound field in the system is balanced, so that the loudspeaker close to the microphone outputs a small volume value without causing feedback whistling to be formed in the system, and the loudspeaker with a large output volume value is far away from the microphone without causing feedback whistling to be formed in the system.
Description
Technical Field
The present invention relates to the field of acoustic technologies, and in particular, to a method for controlling a sound amplification system, a sound amplification control apparatus, and a storage medium.
Background
In the sound amplification system, the sound played by the sound box is picked up by the microphone and is transmitted to the sound box for playing through the microphone. The sound volume emitted by each sound box in the traditional sound reinforcement system for the conference room is the same, and the sound volume of each sound box cannot be controlled, so that the sound volume emitted by the sound box close to the microphone is equal to the sound volume emitted by the sound box far from the microphone in the transmission process of sound, so that when a user speaks at one microphone, the sound volume heard by the user at different positions is different, under the condition that the sound emitted by each sound box in the conference room is ensured, when the microphone is close to the sound box, the sound emitted by the sound box close to the microphone is loud for the microphone, then the sound can be captured by the microphone close to the microphone, at the moment, the microphone transmits the sound to the amplifier, and the amplifier transmits the sound to the sound box, and the sound becomes loud. The amplified sound is again captured by the microphone. The circuit processing is very fast, so that the frequency of howling is high, and the hearing experience of a user is seriously influenced.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a control method of a sound reinforcement system, and aims to solve the technical problem that howling occurs in the sound reinforcement system in a conference room due to unbalanced sound field and too large sound emitted by a sound box which is very close to a microphone.
In order to achieve the above object, the present invention provides a method for controlling a sound reinforcement system, comprising the steps of:
when a debugging instruction is received, sequentially controlling each loudspeaker to emit white noise;
acquiring a volume value picked up by each microphone when each loudspeaker emits the white noise;
determining a target volume output proportion of each microphone corresponding to each loudspeaker according to the volume value picked up by each microphone when each loudspeaker emits the white noise;
when the microphones output the sound volume values to the loudspeakers according to the target sound volume output proportion, the sound volume values picked up by the microphones are the same when the sound volume values corresponding to the sound signals picked up by the microphones are output to the loudspeakers according to the target sound volume output proportion.
Optionally, the step of determining a target volume output proportion of each microphone corresponding to each loudspeaker according to the volume value picked up by each microphone when each loudspeaker emits the white noise comprises:
determining an output volume reference value of each microphone according to the volume value picked up by each microphone when each loudspeaker emits the white noise;
and adjusting the volume output proportion of each microphone to each loudspeaker to ensure that the output volume reference values of the microphones are the same, and taking the volume output proportion adjusted by each microphone as the target volume output proportion of each loudspeaker corresponding to each microphone.
Optionally, the step of determining an output volume reference value of each microphone according to the volume value picked up by each microphone when the white noise is emitted from the loudspeaker comprises:
acquiring a difference value between a volume value picked up by each microphone when each loudspeaker emits the white noise and a preset volume value;
and determining the output volume reference value according to all the difference values corresponding to each microphone.
Optionally, the preset volume value is a minimum volume value among volume values picked up by each microphone when the white noise is emitted from the loudspeaker.
Optionally, the method for controlling the sound reinforcement system further includes:
after the volume value of each loudspeaker picked up by each microphone is obtained, the gain value of the loudspeaker is determined according to the volume value of each loudspeaker picked up by each microphone and the howling critical value.
Optionally, the step of determining the gain value of the loudspeaker according to the volume value of each loudspeaker picked up by each microphone and the howling threshold value includes:
acquiring the sum of the volume values of all the loudspeakers picked up by all the microphones;
determining an average volume value picked up by all the microphones based on the sum of the volume values;
and determining the gain value of the loudspeaker according to the average volume value and the howling critical value.
Optionally, the public address system includes at least two loudspeakers and at least two microphones, each microphone is connected to each loudspeaker, and the control method of the public address system includes:
when a sound signal is received, determining a target microphone for acquiring the sound signal, and acquiring a volume value corresponding to the sound signal;
acquiring a target volume output proportion of each loudspeaker corresponding to the target microphone;
and determining a target volume value output to each loudspeaker according to the volume value and the target volume output proportion.
Optionally, after the step of determining the target volume value output to each loudspeaker according to the volume value and the target volume output ratio, the method further includes:
determining a target output volume value of each loudspeaker according to the target volume value of each loudspeaker and the gain value of each loudspeaker;
and controlling each loudspeaker to output sound according to the target output volume value.
In order to achieve the above-mentioned problem, the present invention further provides a sound amplification control apparatus, including: a memory, a processor and a public address control program stored on the memory and executable on the processor, the public address control program, when executed by the processor, implementing the steps of the control method of the public address system as described above.
Further, to achieve the above object, the present invention also provides a computer-readable storage medium having stored thereon a sound amplification control program which, when executed by a processor, implements the steps of the control method of the sound amplification system as described above.
After the debugging instruction is received, the loudspeakers are controlled to emit white noise in sequence, then each microphone picks up the volume value when each loudspeaker emits white noise, and the target volume output proportion of each microphone corresponding to each loudspeaker is obtained according to the volume value picked up by each microphone when each loudspeaker emits white noise, so that when the volume value corresponding to the sound signal picked up by each microphone is output to each loudspeaker according to the target volume output proportion, the volume values picked up by each microphone are the same, and when each loudspeaker in the system works normally, sound fields in the system are balanced, so that the sound emitted by the loudspeaker close to the microphone is small, feedback howling cannot be formed in the system, and the loudspeaker with large sound is far away from the microphone, so that feedback howling cannot be formed in the system.
Drawings
FIG. 1 is a schematic diagram of an apparatus in a hardware operating environment according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a control method of the sound reinforcement system according to a first embodiment of the present invention;
fig. 3 is a schematic flow chart of a control method of the sound reinforcement system according to a second embodiment of the present invention;
fig. 4 is a schematic flow chart of a control method of the sound reinforcement system according to a third embodiment of the present invention;
fig. 5 is a schematic flow chart of a fourth embodiment of the control method of the sound reinforcement system according to the present invention;
fig. 6 is a schematic flow chart of a fifth embodiment of the control method of the sound reinforcement system according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main solution of the embodiment of the invention is as follows: when a debugging instruction is received, sequentially controlling each loudspeaker to emit white noise; acquiring a volume value picked up by each microphone when each loudspeaker emits the white noise; determining a target volume output proportion of each microphone corresponding to each loudspeaker according to the volume value picked up by each microphone when each loudspeaker emits the white noise; when the microphones output the sound volume values to the loudspeakers according to the target sound volume output proportion, the sound volume values picked up by the microphones are the same when the sound volume values corresponding to the sound signals picked up by the microphones are output to the loudspeakers according to the target sound volume output proportion.
Because the prior art can not realize that the sound intensity is the same when the microphone in the sound amplifying system speaks and the sound can be heard at any position in the system, the howling is easy to generate in the system when the distance between the sound box and the microphone in the system is very close. The invention provides a solution, which ensures that when any microphone in a sound amplifying system speaks, the sound level of any position in the system can be the same when the sound is heard, thereby ensuring the balance of sound fields in the system and ensuring that no howling is generated in the whole using process of the system.
As shown in fig. 1, fig. 1 is a schematic terminal structure diagram of a hardware operating environment according to an embodiment of the present invention.
The application scene of the embodiment of the invention can be occasions with a plurality of microphones and a plurality of sound box devices in a meeting room, various movie theaters, a gymnasium, a dance hall and the like.
As shown in fig. 1, the terminal may include: a processor 1001, such as a CPU, a user interface 1003, a memory 1005, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a voice pickup module, such as a microphone, or the like. The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
It is to be understood that the terminal may further include a network interface 1004, and that the network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). Optionally, the terminal may further include RF (Radio Frequency) circuits, sensors, audio circuits, WiFi modules, and the like.
Those skilled in the art will appreciate that the terminal structure shown in fig. 1 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a public address control program.
In the terminal shown in fig. 1, the network interface 1004 is mainly used for connecting to a backend server and performing data communication with the backend server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be configured to call the public address control program stored in the memory 1005 and perform the following operations:
when a debugging instruction is received, sequentially controlling each loudspeaker to emit white noise;
acquiring a volume value picked up by each microphone when each loudspeaker emits the white noise;
determining a target volume output proportion of each microphone corresponding to each loudspeaker according to the volume value picked up by each microphone when each loudspeaker emits the white noise;
when the microphones output the sound volume values to the loudspeakers according to the target sound volume output proportion, the sound volume values picked up by the microphones are the same when the sound volume values corresponding to the sound signals picked up by the microphones are output to the loudspeakers according to the target sound volume output proportion.
Further, the processor 1001 may call a network operation control application stored in the memory 1005, and also perform the following operations:
determining an output volume reference value of each microphone according to the volume value picked up by each microphone when each loudspeaker emits the white noise;
and adjusting the volume output proportion of each microphone to each loudspeaker to ensure that the output volume reference values of the microphones are the same, and taking the volume output proportion adjusted by each microphone as the target volume output proportion of each loudspeaker corresponding to each microphone.
Further, the processor 1001 may call a network operation control application stored in the memory 1005, and also perform the following operations:
acquiring a difference value between a volume value picked up by each microphone when each loudspeaker emits the white noise and a preset volume value;
and determining the output volume reference value according to all the difference values corresponding to each microphone.
Further, the processor 1001 may call a network operation control application stored in the memory 1005, and also perform the following operations:
after the volume value of each loudspeaker picked up by each microphone is obtained, the gain value of the loudspeaker is determined according to the volume value of each loudspeaker picked up by each microphone and the howling critical value.
Further, the processor 1001 may call a network operation control application stored in the memory 1005, and also perform the following operations:
acquiring the sum of the volume values of all the loudspeakers picked up by all the microphones;
determining an average volume value picked up by all the microphones based on the sum of the volume values;
and determining the gain value of the loudspeaker according to the average volume value and the howling critical value.
Further, the processor 1001 may call a network operation control application stored in the memory 1005, and also perform the following operations:
when a sound signal is received, determining a target microphone for acquiring the sound signal, and acquiring a volume value corresponding to the sound signal;
acquiring a target volume output proportion of each loudspeaker corresponding to the target microphone;
and determining a target volume value output to each loudspeaker according to the volume value and the target volume output proportion.
Further, the processor 1001 may call a network operation control application stored in the memory 1005, and also perform the following operations:
determining a target output volume value of each loudspeaker according to the target volume value of each loudspeaker and the gain value of each loudspeaker;
and controlling each loudspeaker to output sound according to the target output volume value.
Referring to fig. 2, a first embodiment of a method for controlling an acoustic amplification system according to the present invention provides a method for controlling an acoustic amplification system, where the method for controlling an acoustic amplification system includes:
step S10, when a debugging instruction is received, sequentially controlling each loudspeaker to emit white noise;
step S20, acquiring the volume value picked up by each microphone when each loudspeaker emits the white noise;
step S30, determining a target volume output ratio of each microphone corresponding to each loudspeaker according to the volume value picked up by each microphone when each loudspeaker emits the white noise.
When the microphones output the sound volume values to the loudspeakers according to the target sound volume output proportion, the sound volume values picked up by the microphones are the same when the sound volume values corresponding to the sound signals picked up by the microphones are output to the loudspeakers according to the target sound volume output proportion.
The sound signal refers to a sound signal that can be picked up by the microphone in the public address system after the public address system completes debugging, for example: speech sounds, music sounds, etc.
The sound amplification system comprises sound amplification equipment and a sound field, and mainly comprises a sound source and a sound environment around the sound source, a microphone for converting sound into an electric signal, equipment for amplifying and processing the signal, a transmission line, a sound amplifier for converting the signal into the sound signal and an acoustic environment of an audience area. When the loudspeaker system sequentially controls each loudspeaker to emit white noise, each loudspeaker sequentially transmits the white noise, so that the microphone can sequentially receive the white noise emitted by each loudspeaker, wherein the white noise emitted by each loudspeaker is equal in size, but the distances between each loudspeaker and the microphone are different, so that when the white noise emitted by each loudspeaker is collected by the microphone, the white noise collected by the microphone is inversely proportional to the distance between the loudspeaker and the microphone, namely when the microphone is far away from the loudspeaker, the white noise collected by the microphone is smaller; conversely, when the distance between the microphone and the loudspeaker is short, the white noise of the loudspeaker collected by the microphone is large.
Correspondingly, when the loudspeaker is far away from the microphone, the sound volume value corresponding to white noise emitted by the loudspeaker and collected by the microphone is smaller, and when the loudspeaker is close to the microphone, the sound volume value corresponding to white noise emitted by the loudspeaker and collected by the microphone is larger. In order to enable any position in the system to receive sound, when speaking at the microphone, the sound volume emitted by the farthest sound box is required to be determined, so that the sound emitted by the sound box close to the speaking microphone is far larger than the sound emitted by the sound box far away from the speaking microphone, and when the distance between the microphone and the sound box is very close, the microphone receives the sound emitted by the sound box close to the speaking microphone, so that positive feedback is formed, and howling occurs in the system. In this implementation, after the sound amplifying system obtains the volume value picked up by each microphone when each loudspeaker emits the white noise, the sound amplifying system also obtains the relative distance between each microphone and each loudspeaker, and the microphone correspondingly allocates different proportions to each loudspeaker according to the distance between the microphone and each loudspeaker, where the proportion is inversely proportional to the distance between the microphone and each loudspeaker, that is, when the distance between the microphone and each loudspeaker is long, the proportion allocated to the loudspeaker by the microphone is large; when the distance between the microphone and the loudspeaker is relatively short, the proportion of the microphone assigned to the loudspeaker is relatively small. It should be noted that, when each microphone is allocated with a corresponding proportion to each loudspeaker according to a proportional relationship, the proportion is irrelevant to the volume input by the microphone during use, but the number of microphones opened during debugging of the system and the distance between each microphone and each loudspeaker are relevant, when the number of opened microphones in the system increases or the distance between each microphone and each loudspeaker changes, the proportion allocated by each microphone to each loudspeaker needs to be recalculated, and when the number of opened microphones is reduced after debugging of the system, the proportion allocated by each microphone to each loudspeaker does not need to be recalculated, and the proportion is determined according to the original allocation example.
Further, after each microphone determines the target volume output ratio allocated to the corresponding loudspeaker, the volume value corresponding to the sound signal picked up by the microphone will be output by the microphone according to the target volume output ratio. Specifically, after a target volume output ratio is determined, that is, after the sound amplification system is debugged, a volume value corresponding to a sound signal picked up by each microphone represents an overall volume value in the sound amplification system, at this time, each microphone is respectively used as a central point, and when each microphone outputs the overall volume value to each loudspeaker according to the target volume output ratio, the loudspeaker close to each microphone is divided into smaller ratios, so as to output smaller volume values; the loudspeakers distant from each of the microphones are separated into a larger proportion, thereby outputting a larger volume value. And for other microphones except the central point, when the volume value emitted by the microphone at the central point is picked up by other microphones, the volume values picked up by other microphones are the same.
Specifically, when each loudspeaker sends white noise, for the real and stable construction of a sound field, it is to be ensured that signals received by each microphone are white noise which is fully reflected and superimposed by an environment, so each loudspeaker sends white noise lasting for one second, and an action of each microphone to collect white noise starts to collect ten frames before each loudspeaker stops sending, it should be noted that the present invention is not limited to setting a sampling rate and a frame length point number, where the values in this embodiment are sampling rate: 48K, one frame: 256 points. Recording ten frames of signals collected by each microphone, thereby calculating the volume value collected by each microphone when each loudspeaker emits the white noise. And through effect test analysis, the loudness of the frame signals is an RMS level value, and the effect is better when ten frame signals are averaged. The RMS level value represents a root mean square value of the level value.
(1) Calculate the RMS level value:
wherein, F represents the number of frame length points, m is the number of the loudspeaker in the system, n is the number of the microphone in the system, and X is the signal value of the sampling point.
(2) Calculating the volume picked up by the microphone when each loudspeaker emits the white noise:
where i denotes the ith frame signal and SmMn denotes the RMS level value of the frame signal.
According to the above calculation, the volume value picked up by each microphone when each loudspeaker emits white noise can be obtained as follows:
in this embodiment, after receiving the debugging command, the sound amplifier system controls the sound amplifier to emit white noise, then picking up the volume value when each microphone emits white noise, and obtaining the target volume output proportion of each microphone corresponding to each loudspeaker according to the volume value picked up when each microphone emits white noise, when the volume value corresponding to the sound signal picked up by each microphone is output to each loudspeaker according to the target volume output proportion, the volume values picked up by each microphone are the same, so that when each loudspeaker in the system works normally, the sound field in the system is balanced, therefore, the sound emitted by the loudspeaker close to the microphone is small and cannot cause feedback howling in the system, and the sound of the loudspeaker far away from the microphone cannot cause feedback howling in the system.
Further, referring to fig. 3, a second embodiment of the control method of the sound amplifying system according to the present invention provides a control method of the sound amplifying system, and based on the above-mentioned embodiment shown in fig. 2, the step of determining a target volume output ratio of each microphone corresponding to each loudspeaker according to a volume value picked up by each microphone when each loudspeaker emits white noise includes:
step S31, determining the output volume reference value of each microphone according to the volume value picked up by each microphone when each loudspeaker emits the white noise;
step S32, adjusting the volume output ratio of each microphone to each loudspeaker, so that the reference values of the output volume of each microphone are the same, and taking the adjusted volume output ratio of each microphone as the target volume output ratio of each loudspeaker corresponding to each microphone.
Specifically, the loudspeaker system comprises a plurality of microphones and a plurality of loudspeakers, when the target volume output proportion of each microphone corresponding to each loudspeaker is determined according to the volume value picked up by each microphone when each loudspeaker emits white noise, all the microphones are kept in an open state, for each microphone, the sensitivity of each microphone may be different or the white noise emitted by different loudspeakers is different, so that when the volume values picked up by each microphone when all the loudspeakers emit white noise are summed up, the total volume value and the sum of the volume values picked up by each microphone when each loudspeaker emits white noise are not completely equal, therefore, the volume value finally picked up by each microphone is the same, and howling is not generated in the system, and acquiring the sum volume value of the volume values picked up by one of the microphones when the respective loudspeakers emit white noise from the sum volume value of the volume values picked up by the microphones when the respective loudspeakers emit white noise, wherein the acquired sum volume value of the volume values picked up by one of the microphones when the respective loudspeakers emit white noise is the smallest sum volume value among the sum volume values of the volume values picked up by all the microphones when the respective loudspeakers emit white noise, and taking the sum volume value of the volume values picked up by one of the microphones corresponding to the smallest sum volume value when the respective loudspeakers emit white noise as the output volume reference value of each of the microphones. And reducing the total volume of the volume values picked up by the microphones when the loudspeakers emit white noise according to the output volume reference value, so that the total volume value of the volume values picked up by the microphones when the loudspeakers emit white noise is equal to the output volume reference value, ensuring that the total volume emitted by the microphones in the system is equal and not too large, avoiding howling in the system, and adjusting the volume output proportion of each microphone corresponding to each loudspeaker according to the output volume reference value under the condition of ensuring that the output volume reference value is not changed, thereby obtaining the target volume output proportion of each microphone corresponding to each loudspeaker, and further achieving sound field balance. Wherein, the sound field balance formula is:
where Ln denotes a sound pressure and Psum denotes a sum of levels of all the microphones.
Specifically, (1) a sound pressure corresponding to a frame signal of the white noise is calculated:
wherein F1, F2... Fn is the floating point number of the signal.
(2) Calculating a sound field superposition value:
thereby obtaining the sum of the levels of all the microphones.
In this embodiment, after the sound amplifying system receives the debugging instruction, the sound amplifiers are sequentially controlled to emit white noise, then each microphone picks up the volume value when each sound amplifier emits white noise, then the output volume reference value of each microphone is determined according to the volume value, and then the volume output ratio of each microphone to each sound amplifier is adjusted according to the output volume reference value, so that the output volume reference values of the microphones are the same, and the volume output ratio adjusted by each microphone is used as the target volume output ratio of each sound amplifier corresponding to each microphone, so that when the volume value corresponding to the sound signal picked up by each microphone is output to each sound amplifier according to the target volume output ratio, the volume values picked up by the microphones are the same, so that when each sound amplifier in the system is ensured to normally operate, the sound field in the system is balanced, therefore, the sound emitted by the loudspeaker close to the microphone is small and cannot cause feedback howling in the system, and the sound of the loudspeaker far away from the microphone cannot cause feedback howling in the system.
Referring to fig. 4, a first embodiment of the method for controlling a sound amplification system according to the present invention provides a method for controlling a sound amplification system, and based on the embodiment shown in fig. 3, the step of determining an output volume reference value of each microphone according to a volume value picked up by each microphone when each microphone emits white noise includes:
step S41, acquiring the difference value between the volume value picked up by each microphone when each loudspeaker emits the white noise and a preset volume value;
step S42, determining the output volume reference value according to all the differences corresponding to each of the microphones.
Specifically, when the reference value of the output volume of each microphone is determined by obtaining the volume value picked up by each microphone when each loudspeaker emits the white noise, according to the volume value picked up by each microphone when each loudspeaker emits the white noise, only the distance between each microphone and each loudspeaker is not equal, and the difference between the volume values picked up by each microphone when each loudspeaker emits the white noise cannot be determined, so that a preset volume value is set, wherein in this embodiment, the preset volume value is the minimum volume value among the volume values picked up by each microphone when each loudspeaker emits the white noise. Taking the preset volume value as a reference, subtracting the preset volume value from the volume value picked up by each microphone when each loudspeaker emits white noise, wherein the obtained difference is the volume value difference between the volume value picked up by each microphone when each loudspeaker emits white noise and the preset volume value, each volume value difference is the volume output proportion of each loudspeaker in the sound field of each microphone, and in order to ensure that howling does not occur in the system, the volume output proportion of each microphone to each loudspeaker is required to meet the following requirements: in this embodiment, it can be known from a plurality of tests that the effect obtained in the sound amplifying system is better when the sound volume output ratio is distributed quadratically to the floating point values. Further, after obtaining the floating point values, adding all the floating point values corresponding to each of the microphones to obtain an output volume parameter value of each of the microphones, and it is noted that the output volume parameter value is also essentially a sum volume value of volume values picked up by each of the microphones when each of the loudspeakers emits white noise, so as to ensure that a sound field in the system is balanced and no howling occurs in the system, a minimum one of the output parameter values is obtained from all the output parameter values, and the output parameter value is determined as an output volume reference value of each of the microphones.
Specifically, (1) floating point values are calculated:
where Dmn represents a volume value difference between a volume value picked up by each microphone when each loudspeaker emits white noise and a preset volume value.
(2) Calculating an output volume parameter value:
wherein i represents the mth number of the loudspeaker, Fin represents the floating point value corresponding to the volume value difference value between the volume value picked up by the nth microphone when the mth loudspeaker emits white noise and the preset volume value.
In this embodiment, after the sound amplifying system receives the debugging instruction, the sound expanders are sequentially controlled to emit white noise, then each microphone picks up a volume value when each sound expander emits white noise, then an output volume reference value of each microphone is determined according to a difference value between each volume value and a preset volume value, and then a volume output ratio of each microphone to each sound expander is adjusted according to the output volume reference value, so that the output volume reference values of each microphone are the same, and the volume output ratio adjusted by each microphone is used as a target volume output ratio of each sound expander corresponding to each microphone, so that when a volume value corresponding to a sound signal picked up by each microphone is output to each sound expander according to the target volume output ratio, the volume values picked up by each microphone are the same, thereby ensuring that each sound expander in the system works normally, the sound fields in the system are balanced, so that the sound emitted by the loudspeaker close to the microphone is small and cannot cause feedback howling in the system, and the sound emitted by the loudspeaker far away from the microphone is large and cannot cause feedback howling in the system.
Referring to fig. 5, a fourth embodiment of the method for controlling a sound reinforcement system according to the present invention provides a method for controlling a sound reinforcement system, and based on the embodiment shown in fig. 2, the method for controlling a sound reinforcement system further includes:
step S50, after obtaining the volume value of each loudspeaker picked up by each microphone, determining the gain value of the loudspeaker according to the volume value of each loudspeaker picked up by each microphone and the howling critical value.
Due to the uncontrollable property of the equipment, if the system is connected with a high-sensitivity microphone, the system can generate howling; if the system is connected with a microphone with low sensitivity, the sound intensity is not enough, the sound pick-up distance is short, and the whole volume needs to be reduced or increased.
Specifically, the step of determining the gain value of the loudspeaker according to the volume value of each loudspeaker picked up by each microphone and the howling threshold value includes:
step S51, obtaining the sum of the volume values of the loudspeakers picked up by all the microphones;
step S52, determining the average volume value picked up by all the microphones based on the sum of the volume values;
step S53, determining the gain value of the loudspeaker according to the average volume value and the howling critical value;
after multiple tests, after the sound volume values of the loudspeakers picked up by each microphone are obtained, the average sound volume value picked up by all the microphones is obtained by obtaining the sum of the sound volume values of the loudspeakers picked up by all the microphones, and the gain value of the loudspeaker can be determined according to the white noise output level of the loudspeaker. It should be noted that the howling threshold in the system is known from a plurality of tests, and the calculated gain value of the loudspeaker is already the gain value controlled when the system does not reach the howling threshold.
Specifically, (1) calculate the average volume value picked up by all the microphones:
wherein i represents the mth number of the loudspeaker, and j represents the nth number of the microphone.
(2) Calculating a gain value of the loudspeaker:
wherein P represents an average volume value picked up by all the microphones, and S represents an output level of white noise transmitted from the loudspeaker.
In the implementation, after the sound amplifying system receives the debugging instruction, the sound expanders are controlled to emit white noise in sequence, then each microphone picks up the volume value when each sound expander emits white noise, the target volume output proportion of each microphone corresponding to each sound expander is obtained according to the volume value picked up by each microphone when each sound expander emits white noise, the gain value of each sound expander is low according to the volume value and the howling critical value of each sound expander picked up by each microphone, then when the volume value corresponding to the sound signal picked up by each microphone is output to each sound expander according to the target volume output proportion, the volume values picked up by each microphone are the same, so that when each sound expander in the system works normally, the sound field in the system is balanced, and the sound emitted by the sound expanders close to the microphone is small, and feedback howling cannot be formed in the system, loud loudspeakers are far from the microphone without causing feedback howling in the system.
Referring to fig. 6, a fifth embodiment of the control method of an acoustic amplification system according to the present invention provides a control method of an acoustic amplification system, where the acoustic amplification system includes at least two loudspeakers and at least two microphones, and each microphone is connected to each loudspeaker, and the control method of the acoustic amplification system includes:
step S60, when receiving a sound signal, determining a target microphone for collecting the sound signal, and acquiring a volume value corresponding to the sound signal;
step S70, obtaining the target volume output proportion of each loudspeaker corresponding to the target microphone;
step S80, determining a target volume value to be output to each loudspeaker according to the volume value and the target volume output ratio.
Specifically, when the sound amplification system receives the sound signal, the sound amplification system can determine which microphone the sound signal is emitted from according to the volume of the sound signal collected by each microphone in the sound amplification system, so as to determine a target microphone for collecting the sound signal, and acquire and record a volume value corresponding to the sound signal collected by the microphone. Further, a target volume output proportion of the target microphone corresponding to each loudspeaker is obtained, where the target volume output proportion is calculated by each microphone according to white noise emitted by each loudspeaker when the loudspeaker system is debugged, and indicates that after the target microphone picks up a volume value, the loudspeaker system allocates the volume value to each loudspeaker according to the target volume output proportion of the target microphone corresponding to each loudspeaker. That is, when the tuning of the sound amplifying system is completed and the volume value corresponding to the received sound signal in the sound amplifying system is obtained, the sound amplifying system calls the target volume output proportion of each loudspeaker corresponding to the target microphone calculated during tuning, and distributes the volume value obtained corresponding to the sound signal to the corresponding loudspeaker according to the target volume output proportion, so that the corresponding loudspeaker outputs the volume value obtained according to the target volume output proportion.
Further, after the step of determining the target volume value output to each loudspeaker according to the volume value and the target volume output ratio, the method further includes:
step S90, determining the target output volume value of the loudspeaker according to the target volume value of each loudspeaker and the gain value of each loudspeaker;
and step S100, controlling each loudspeaker to output sound according to the target output volume value.
When the sound amplifying system is debugged and used, due to the fact that the sensitivity of each microphone is different or the power of each loudspeaker is different, howling may occur in the sound amplifying system in the using process, specifically, it can be known through multiple tests that the calculated gain adaptive factor can integrally increase or decrease the volume of each loudspeaker in the sound amplifying system under the condition that the sound amplifying system does not generate noise, for example, when the calculated gain adaptive factor is +3, the sound amplifier in the system can integrally increase by 3dB, and when the calculated gain adaptive factor is-3, the sound amplifier in the system can integrally decrease by 3 dB.
That is, when the tuning is completed and the volume value corresponding to the sound signal in the sound amplifier system is received, the volume value is distributed to each corresponding loudspeaker according to the target volume output proportion, and the sound amplifier system further obtains the gain adaptive factor of the loudspeaker through the volume value and the white noise output level of the loudspeaker, so that the volume value distributed to each loudspeaker according to the target volume output proportion is increased or decreased according to the gain adaptive factor to obtain the final output volume value. It should be noted that, when each microphone is allocated with a corresponding proportion to each loudspeaker according to a proportional relationship, the proportion is irrelevant to the volume input by the microphone when in use, but the number of microphones opened by the system during debugging and the distance between each microphone and each loudspeaker are relevant, when the number of opened microphones in the system increases or the distance between each microphone and each loudspeaker changes, the proportion allocated by each microphone to each loudspeaker needs to be recalculated, and when the number of opened microphones is reduced after the system is debugged, the proportion allocated by each microphone to each loudspeaker does not need to be recalculated, according to the original allocation example.
In this embodiment, after determining a target microphone for collecting a sound signal when receiving the sound signal, obtaining a volume value corresponding to the sound signal, a target volume output ratio of each loudspeaker corresponding to the target microphone, and a gain value of the loudspeaker, outputting the volume value corresponding to the received sound signal to each loudspeaker, thereby obtaining the target volume value output by each loudspeaker, so that the volume values collected by each microphone are the same, thereby ensuring that each loudspeaker in the system works normally, sound fields in the system are balanced, so that the sound emitted by the loudspeaker close to the microphone is small and a feedback howling is not formed in the system, and the loudspeaker with large sound is far from the microphone and a feedback howling is not formed in the system.
The embodiment of the present invention further provides a sound amplification control device, where the sound amplification control device includes: a memory, a processor and a public address control program stored on the memory and executable on the processor, the public address control program, when executed by the processor, implementing the steps of the control method of the public address system as described above.
Furthermore, an embodiment of the present invention further provides a computer-readable storage medium, where a sound amplification control program is stored, and when being executed by a processor, the sound amplification control program implements the steps of the control method for a sound amplification system as described above.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for controlling an audio amplification system, wherein the audio amplification system comprises at least two loudspeakers and at least two microphones, each microphone being connected to each loudspeaker, the method for controlling an audio amplification system comprising the steps of:
when a debugging instruction is received, sequentially controlling each loudspeaker to emit white noise;
acquiring a volume value picked up by each microphone when each loudspeaker emits the white noise;
determining a target volume output proportion of each microphone corresponding to each loudspeaker according to the volume value picked up by each microphone when each loudspeaker emits the white noise;
when the microphones output the sound volume values to the loudspeakers according to the target sound volume output proportion, the sound volume values picked up by the microphones are the same when the sound volume values corresponding to the sound signals picked up by the microphones are output to the loudspeakers according to the target sound volume output proportion.
2. The method for controlling a sound amplification system according to claim 1, wherein the step of determining the target volume output ratio of each microphone corresponding to each loudspeaker according to the volume value picked up by each microphone when each loudspeaker emits white noise comprises:
determining an output volume reference value of each microphone according to the volume value picked up by each microphone when each loudspeaker emits the white noise;
and adjusting the volume output proportion of each microphone to each loudspeaker to ensure that the output volume reference values of the microphones are the same, and taking the volume output proportion adjusted by each microphone as the target volume output proportion of each loudspeaker corresponding to each microphone.
3. The sound reinforcement system control method according to claim 2, wherein the step of determining an output volume reference value of each microphone based on a volume value picked up by each microphone when the respective loudspeaker emits the white noise comprises:
acquiring a difference value between a volume value picked up by each microphone when each loudspeaker emits the white noise and a preset volume value;
and determining the output volume reference value according to all the difference values corresponding to each microphone.
4. The sound reinforcement system control method according to claim 3, wherein the preset volume value is a minimum volume value among volume values picked up by each of the microphones when the respective loudspeakers emit the white noise.
5. The method for controlling a sound reinforcement system according to claim 1, wherein the method for controlling a sound reinforcement system further comprises:
after the volume value of each loudspeaker picked up by each microphone is obtained, the gain value of the loudspeaker is determined according to the volume value of each loudspeaker picked up by each microphone and the howling critical value.
6. The method of claim 5, wherein the step of determining the gain values of the loudspeakers according to the volume values of the loudspeakers picked up by each microphone and the howling threshold comprises:
acquiring the sum of the volume values of all the loudspeakers picked up by all the microphones;
determining an average volume value picked up by all the microphones based on the sum of the volume values;
and determining the gain value of the loudspeaker according to the average volume value and the howling critical value.
7. A method for controlling an audio amplification system, wherein the audio amplification system comprises at least two loudspeakers and at least two microphones, and each microphone is connected to each loudspeaker, the method for controlling the audio amplification system comprises:
when a sound signal is received, determining a target microphone for acquiring the sound signal, and acquiring a volume value corresponding to the sound signal;
acquiring a target volume output proportion of each loudspeaker corresponding to the target microphone;
and determining a target volume value output to each loudspeaker according to the volume value and the target volume output proportion.
8. The loudspeaker system control method as claimed in claim 7, wherein, after the step of determining the target volume value to be output to each loudspeaker based on the volume value and the target volume output ratio, further comprising:
determining a target output volume value of each loudspeaker according to the target volume value of each loudspeaker and the gain value of each loudspeaker;
and controlling each loudspeaker to output sound according to the target output volume value.
9. A sound amplification control apparatus, characterized by comprising: memory, a processor and a public address control program stored on the memory and executable on the processor, the public address control program, when executed by the processor, implementing the steps of the control method of the public address system as claimed in any one of claims 1 to 8.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a public address control program which, when executed by a processor, implements the steps of the control method of a public address system as claimed in any one of claims 1 to 8.
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