CN111698633B - Method for measuring TS parameters of loudspeaker - Google Patents
Method for measuring TS parameters of loudspeaker Download PDFInfo
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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
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
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Abstract
The invention is suitable for the technical field of loudspeakers, and provides a loudspeaker TS parameter measuring method, which is applied to a loudspeaker TS parameter measuring device and comprises the following steps: when the loudspeaker is horizontally placed, reading of a pressure sensor when a telescopic rod of the stepping motor is in contact with a vibrating diaphragm of the loudspeaker is obtained and recorded as a first pressure value; after preset pressure is applied to a vibrating diaphragm of a loudspeaker and current is introduced to the loudspeaker through a power supply, current reading of the power supply is obtained when the reading of a pressure sensor is equal to a first pressure value and is recorded as a first current value; and determining the force coefficient of the loudspeaker according to the first current value. The method for measuring the TS parameters of the loudspeaker can accurately measure partial TS parameters of the loudspeaker, has simple measuring process, does not damage a vibrating diaphragm of the loudspeaker and has strong usability.
Description
Technical Field
The invention belongs to the technical field of loudspeakers, and particularly relates to a method for measuring TS parameters of a loudspeaker.
Background
The TS parameter is an important parameter of the loudspeaker, and accurate measurement of the TS parameter has very important significance for design and development of the loudspeaker.
The TS parameters of the loudspeaker comprise force coefficient, vibration quality, compliance and the like, the methods for measuring the parameters in the prior art mainly comprise a mass adding method and a closed volume method, and the mass adding method adopts a glue bonding mode, so that glue marks are easily left on the loudspeaker or the vibration structure of the loudspeaker is easily damaged, and the usability is poor; the closed volume method needs to make a closed box body with equivalent volume similar to that of the loudspeaker, and has complicated measuring steps and low measuring precision.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method for measuring a TS parameter of a speaker, so as to solve the problems of low measurement accuracy and poor usability of the method for measuring a TS parameter of a speaker in the prior art.
The embodiment of the invention provides a method for measuring TS parameters of a loudspeaker, which is applied to a device for measuring the TS parameters of the loudspeaker, wherein the device for measuring the TS parameters of the loudspeaker comprises a bracket, a pressure sensor, a stepping motor and a power supply; the TS parameter measuring device of the loudspeaker is fixed on a frame of the loudspeaker through a bracket; the pressure sensor is fixed on the bracket and connected with the stepping motor and used for collecting pressure data through a telescopic rod of the stepping motor; the power supply is used for supplying power to the loudspeaker.
The method comprises the following steps:
when the loudspeaker is horizontally placed, reading of a pressure sensor when a telescopic rod of the stepping motor is in contact with a vibrating diaphragm of the loudspeaker is obtained and recorded as a first pressure value;
after preset pressure is applied to a vibrating diaphragm of a loudspeaker and current is introduced to the loudspeaker through a power supply, current reading of the power supply is obtained when the reading of a pressure sensor is equal to a first pressure value and is recorded as a first current value;
the force coefficient of the loudspeaker is determined from the first current value.
Optionally, the value range of the first pressure value is 0.01 to 0.05 newton.
Optionally, the preset pressure has a value not less than 0.1 newton.
Specifically, determining the force coefficient of the loudspeaker according to the first current value comprises the following steps:
in the formula, bl represents the force coefficient of the loudspeaker, F represents the preset pressure, I1The first current value is indicated.
Optionally, the method for measuring the TS parameter of the speaker further includes:
when the loudspeaker is placed horizontally downwards, the reading of the pressure sensor when the telescopic rod of the stepping motor is in contact with the vibrating diaphragm of the loudspeaker is obtained and recorded as a second pressure value;
turning the loudspeaker to be horizontal and upward, and introducing current to the loudspeaker through the power supply, and acquiring a current reading of the power supply when the reading of the pressure sensor is equal to a second pressure value, and recording the current reading as a second current value;
and determining the vibration mass of the loudspeaker according to the second current value.
Specifically, determining the vibration mass of the loudspeaker according to the second current value comprises the following steps:
wherein M represents the vibrating mass of the loudspeaker, I2The second current value is represented, bl represents the force coefficient of the speaker, and g is the gravitational acceleration.
Optionally, the method for measuring the TS parameter of the speaker further includes:
when the loudspeaker is placed horizontally upwards, the reading of the pressure sensor when the telescopic rod of the stepping motor is in contact with the vibrating diaphragm of the loudspeaker is obtained and recorded as a third pressure value;
after the telescopic rod of the stepping motor is controlled to retract to a preset length and current is introduced to the loudspeaker through the power supply, acquiring current reading of the power supply when the reading of the pressure sensor is equal to a third pressure value, and recording the current reading as a third current value;
and determining the compliance of the loudspeaker according to the third current value.
Optionally, the preset length is 1-15 mm.
Specifically, determining the compliance of the speaker according to the third current value includes:
wherein cms represents compliance of the loudspeaker, I3Indicates the third current value, bl indicates the force coefficient of the speaker, and L indicates the preset length.
Optionally, the method for measuring the TS parameter of the speaker further includes: determining the equivalent vibration mass of the loudspeaker according to the compliance of the loudspeaker;
the method for determining the equivalent vibration mass comprises the following steps:
in the formula, mms represents the equivalent vibration mass of the loudspeaker, fs represents the resonance frequency of the loudspeaker, and cms represents the compliance of the loudspeaker.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the method for measuring the TS parameters of the loudspeaker based on the TS parameter measuring device of the loudspeaker can accurately measure partial TS parameters of the loudspeaker, has simple measuring process, does not damage a vibrating diaphragm of the loudspeaker, and has strong usability.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a device for measuring TS parameters of a speaker according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating an implementation of a method for measuring TS parameters of a speaker according to an embodiment of the present invention;
fig. 3 is a schematic flow chart illustrating an implementation of measuring a vibration mass of a speaker in a TS parameter measuring method of the speaker according to an embodiment of the present invention;
fig. 4 is a schematic flow chart illustrating an implementation of measuring compliance of a speaker in the method for measuring TS parameters of the speaker according to the embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Referring to fig. 1, which shows a schematic structural diagram of a speaker TS parameter measuring device provided in an embodiment of the present invention, including a bracket 11, a pressure sensor 12, a stepping motor 13, and a power supply 14, where the bracket 11 may be fixed on a speaker frame 15, and the pressure sensor 12 is connected to the stepping motor 13, and is used to collect pressure data through a telescopic rod 16 of the stepping motor 13; the power supply 14 may provide an adjustable magnitude of direct current to the speaker.
Referring to fig. 2, it shows a flowchart of an implementation of the method for measuring the TS parameter of the speaker according to the embodiment of the present invention, which is detailed as follows:
and S101, when the loudspeaker is horizontally placed, reading of the pressure sensor when the telescopic rod of the stepping motor is in contact with the vibrating diaphragm of the loudspeaker is obtained and recorded as a first pressure value.
In the embodiment of the invention, the loudspeaker can be horizontally placed upwards or downwards, then the loudspeaker TS parameter measuring device is fixed on the frame of the loudspeaker through the support, the reading of the pressure sensor is cleared, the pressure is generated by adjusting the contact of the telescopic rod of the stepping motor and the vibrating diaphragm of the loudspeaker, and the reading of the pressure sensor is read and recorded as the first pressure value. In a specific application scene, a mechanical level meter can be arranged on a bracket of the TS parameter measuring device of the loudspeaker to ensure that the loudspeaker is horizontally placed and improve the measuring precision.
And S102, after preset pressure is applied to a vibrating diaphragm of the loudspeaker and current is introduced into the loudspeaker through the power supply, obtaining the current reading of the power supply when the reading of the pressure sensor is equal to a first pressure value, and recording the current reading as a first current value.
In the embodiment of the present invention, after the step S101, a preset pressure is applied to the diaphragm of the speaker, then a direct current is input to the speaker through the power supply, the magnitude of the current is adjusted, the diaphragm is driven to displace until the reading of the pressure sensor is equal to the first pressure value, and the current reading of the power supply at this time is recorded as the first current value. In this way, the electromagnetic force generated by the speaker (the product of the force coefficient of the speaker and the current passing through the speaker) can be equated to the preset pressure, and the force coefficient of the speaker can be calculated.
Optionally, the value range of the first pressure value is 0.01 to 0.05 newton.
In the embodiment of the invention, the first pressure value can be controlled to be between 0.01 and 0.05 Newton, the first pressure value is greater than 0.01 Newton, the telescopic rod of the stepping motor can be ensured to be fully contacted with the diaphragm of the loudspeaker, and the first pressure value is less than 0.05 Newton, so that the diaphragm of the loudspeaker can be prevented from being deformed to influence the measurement precision.
Optionally, the preset pressure has a value not less than 0.1 newton.
In the embodiment of the present invention, the value of the preset pressure applied to the loudspeaker diaphragm cannot be less than 0.1 newton, otherwise the measurement accuracy may be affected. The preset pressure can be applied in various forms, for example, in a specific application scenario of the embodiment of the present invention, the speaker is placed horizontally upward, a plurality of copper weights with equal size are uniformly placed on the diaphragm of the speaker, and the total pressure generated by the plurality of copper weights can be adapted to different speakers by adjusting the number of the copper weights.
Step S103, determining the force coefficient of the loudspeaker according to the first current value.
Optionally, in step S103, the force coefficient of the speaker is determined according to the following formula:
in the formula, bl represents the force coefficient of the loudspeaker, F represents the preset pressure, I1The first current value is indicated.
Optionally, referring to fig. 3, the method for measuring the TS parameter of the speaker may further include:
step S201, when the loudspeaker is placed horizontally downwards, reading of the pressure sensor when the telescopic rod of the stepping motor is in contact with the vibrating diaphragm of the loudspeaker is obtained and recorded as a second pressure value.
In the embodiment of the invention, a loudspeaker is horizontally placed downwards, a loudspeaker TS parameter measuring device is fixed on a frame of the loudspeaker through a support, the reading of a pressure sensor is cleared, the reading of the pressure sensor is read and recorded as a second pressure value by adjusting the contact of a telescopic rod of a stepping motor and a vibrating diaphragm of the loudspeaker, and the value range of the second pressure value is controlled between 0.01 Newton and 0.05 Newton.
And S202, after the loudspeaker is turned to be horizontal and upward and current is introduced into the loudspeaker through the power supply, obtaining the current reading of the power supply when the reading of the pressure sensor is equal to a second pressure value, and recording the current reading as a second current value.
In the embodiment of the present invention, after step S201, the speaker is turned over to be horizontal and upward, the diaphragm of the speaker drops due to the gravity and is separated from the pressure sensor, at this time, the reading of the pressure sensor is cleared, a current is input to the speaker through the power supply, the magnitude of the current is adjusted until the reading of the pressure sensor is equal to the second pressure value, and the current reading of the power supply at this time is recorded as the second current value.
And step S203, determining the vibration mass of the loudspeaker according to the second current value.
In the embodiment of the invention, the measurement result of the vibration mass can be used for checking the vibration mass discreteness of units of the same type.
Optionally, in step S203, the vibration mass of the speaker is determined according to the following formula:
wherein M represents the vibrating mass of the loudspeaker, I2The second current value is represented, bl represents the force coefficient of the speaker, and g is the gravitational acceleration.
Optionally, referring to fig. 4, the method for measuring the TS parameter of the speaker may further include:
step S301, when the loudspeaker is placed horizontally upwards, reading of the pressure sensor when the telescopic rod of the stepping motor is in contact with the vibrating diaphragm of the loudspeaker is obtained and recorded as a third pressure value.
In the embodiment of the invention, a loudspeaker is horizontally and upwards placed, a loudspeaker TS parameter measuring device is fixed on a frame of the loudspeaker through a support, the reading of a pressure sensor is cleared, the reading of the pressure sensor is read and recorded as a third pressure value by adjusting the contact of a telescopic rod of a stepping motor and a vibrating diaphragm of the loudspeaker, and the value range of the third pressure value is controlled between 0.01 Newton and 0.05 Newton.
And S302, after the telescopic rod of the stepping motor is controlled to retract to the preset length and the current is introduced to the loudspeaker through the power supply, acquiring the current reading of the power supply when the reading of the pressure sensor is equal to a third pressure value, and recording the current reading as a third current value.
In the embodiment of the present invention, after step S201, the telescopic rod of the stepping motor is adjusted to retract to the preset length, then the current is input to the speaker through the power supply, the magnitude of the current is adjusted until the reading of the pressure sensor is equal to the third pressure value, and the current reading of the power supply at this time is recorded as the third current value.
Optionally, the preset pressure is 1-15 mm.
In the embodiment of the invention, the retraction length of the telescopic rod of the stepping motor is controlled to be 1-15 mm, if the retraction length is less than 1 mm, the measurement precision may be affected, if the retraction length is greater than 15 mm, the upper limit of the diaphragm displacement of the loudspeaker may be exceeded, the reading of the pressure sensor cannot reach the third pressure value, and in practical application, the preset length can be adjusted according to the specific size model of the loudspeaker.
And step S303, determining the compliance of the loudspeaker according to the third current value.
Optionally, in the step S303, the compliance of the speaker is determined according to the following formula:
wherein cms represents compliance of the loudspeaker, I3Indicates the third current value, bl indicates the force coefficient of the speaker, and L indicates the preset length.
Optionally, the method for measuring the TS parameter of the speaker may further include: determining the equivalent vibration mass of the loudspeaker according to the compliance of the loudspeaker in the step S303; the method for determining the equivalent vibration mass comprises the following steps:
in the formula, mms represents the equivalent vibration mass of the loudspeaker, fs represents the resonance frequency of the loudspeaker, and cms represents the compliance of the loudspeaker.
In the embodiment of the invention, the compliance of the loudspeaker is known, the equivalent vibration mass of the loudspeaker can be calculated according to a formula, and the resonance frequency of the loudspeaker in the formula can be measured by a constant current method.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
From the above, the method for measuring the TS parameters of the loudspeaker based on the TS parameter measuring device of the loudspeaker can accurately measure partial TS parameters of the loudspeaker, and the method has the advantages of simple operation process, no damage to a vibrating diaphragm of the loudspeaker and strong usability.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (7)
1. A method for measuring TS parameters of a loudspeaker is characterized in that the method is applied to a TS parameter measuring device of the loudspeaker, and the TS parameter measuring device of the loudspeaker comprises a bracket, a pressure sensor, a stepping motor and a power supply; the TS parameter measuring device of the loudspeaker is fixed on a frame of the loudspeaker through the bracket; the pressure sensor is fixed on the bracket and connected with the stepping motor and used for collecting pressure data through a telescopic rod of the stepping motor; the power supply is used for supplying power to the loudspeaker;
the method comprises the following steps:
when the loudspeaker is horizontally placed, reading of a pressure sensor when a telescopic rod of the stepping motor is in contact with a vibrating diaphragm of the loudspeaker is obtained and recorded as a first pressure value;
after preset pressure is applied to a vibrating diaphragm of a loudspeaker and current is introduced to the loudspeaker through a power supply, current reading of the power supply is obtained when the reading of a pressure sensor is equal to a first pressure value and is recorded as a first current value;
determining a force coefficient of the loudspeaker according to the first current value:
in the formula, bl represents the force coefficient of the loudspeaker, F represents the preset pressure, I1The first current value is indicated.
2. The method of claim 1, wherein the first pressure value ranges from 0.01 newton to 0.05 newton.
3. The method of claim 1, wherein the preset pressure has a value of not less than 0.1 newton.
4. The method for measuring the TS parameter of the loudspeaker according to claim 1, further comprising:
when the loudspeaker is placed horizontally downwards, the reading of the pressure sensor when the telescopic rod of the stepping motor is in contact with the vibrating diaphragm of the loudspeaker is obtained and recorded as a second pressure value;
turning the loudspeaker to be horizontal and upward, and introducing current to the loudspeaker through the power supply, and acquiring a current reading of the power supply when the reading of the pressure sensor is equal to a second pressure value, and recording the current reading as a second current value;
determining the vibration mass of the loudspeaker according to the second current value:
wherein M represents the vibrating mass of the loudspeaker, I2Representing a second electricityThe flow value, bl denotes the force coefficient of the loudspeaker and g is the acceleration of gravity.
5. The method for measuring the TS parameter of the loudspeaker according to claim 1, further comprising:
when the loudspeaker is placed horizontally upwards, the reading of the pressure sensor when the telescopic rod of the stepping motor is in contact with the vibrating diaphragm of the loudspeaker is obtained and recorded as a third pressure value;
after the telescopic rod of the stepping motor is controlled to retract to a preset length and current is introduced to the loudspeaker through the power supply, acquiring current reading of the power supply when the reading of the pressure sensor is equal to a third pressure value, and recording the current reading as a third current value;
determining the compliance of the loudspeaker according to the third current value:
wherein cms represents compliance of the loudspeaker, I3Indicates the third current value, bl indicates the force coefficient of the speaker, and L indicates the preset length.
6. The method of claim 5, wherein the preset length is in a range of 1-15 mm.
7. The method for measuring the TS parameter of the speaker according to claim 6, further comprising: determining the equivalent vibration mass of the loudspeaker according to the compliance of the loudspeaker;
the method for determining the equivalent vibration mass comprises the following steps:
in the formula, mms represents the equivalent vibration mass of the loudspeaker, fs represents the resonance frequency of the loudspeaker, and cms represents the compliance of the loudspeaker.
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| CN102118678B (en) * | 2011-04-02 | 2014-07-23 | 嘉兴中科声学科技有限公司 | Method and system for measuring speaker parameters by using current sensor |
| CN103813258B (en) * | 2014-01-26 | 2017-03-22 | 歌尔股份有限公司 | Method and system for acquiring diaphragm compliance |
| US10734959B2 (en) * | 2016-12-22 | 2020-08-04 | Sony Corporation | Sound processing device and method to suppress an excessive amplitude |
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| CN108040316A (en) * | 2017-11-24 | 2018-05-15 | 维沃移动通信有限公司 | A kind of amplitude detection method and mobile terminal |
| CN209072742U (en) * | 2018-11-21 | 2019-07-05 | 深圳精拓创新科技有限公司 | A kind of vibrating diaphragm tester |
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| CN103079152A (en) * | 2013-01-09 | 2013-05-01 | 嘉善恩益迪电声技术服务有限公司 | Loudspeaker centering support sheet and paper basin folding ring compliance test instrument and compliance factor calculating method |
| CN110823769A (en) * | 2019-12-06 | 2020-02-21 | 中国科学院声学研究所 | Ultrasonic suspension type liquid surface tension coefficient measuring method and device |
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Effective date of registration: 20240713 Address after: 511400 No. 3, Jiushuikeng Development Road, Dalong Street, Panyu District, Guangzhou, Guangdong Patentee after: GUANGZHOU FENGDA MOTOR Co.,Ltd. Country or region after: China Address before: 067000 3-606, Shanxiying community, Shuangqiao District, Chengde City, Hebei Province Patentee before: Shi Dongyang Country or region before: China |
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