CN115484539A - Impedance box and system for measuring impedance of loudspeaker - Google Patents
Impedance box and system for measuring impedance of loudspeaker Download PDFInfo
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- CN115484539A CN115484539A CN202211145342.3A CN202211145342A CN115484539A CN 115484539 A CN115484539 A CN 115484539A CN 202211145342 A CN202211145342 A CN 202211145342A CN 115484539 A CN115484539 A CN 115484539A
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- 238000012360 testing method Methods 0.000 claims abstract description 40
- 238000002847 impedance measurement Methods 0.000 claims abstract description 13
- 230000003068 static effect Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 abstract description 17
- 238000010586 diagram Methods 0.000 description 10
- 238000004364 calculation method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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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
- H04R2400/00—Loudspeakers
- H04R2400/11—Aspects regarding the frame of loudspeaker transducers
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Abstract
The application discloses measure impedance box and system of speaker impedance includes: the circuit comprises a first selection switch, a second selection switch, a first reference resistor and a second reference resistor; the first end and the second end of the first reference resistor are respectively connected with the first movable contact of the first selection switch and the negative port of the amplifier; the first end and the second end of the second reference resistor are respectively connected with the second moving contact of the first selection switch and the negative port of the amplifier; a static contact of the first selection switch is connected with the first test port; a fixed contact of the first selection switch is connected with a first movable contact of the second selection switch, and a second movable contact of the second selection switch is connected with a positive port of the amplifier; a static contact of the second selector switch is connected with the second test port; the first end of the first reference resistor is connected with the first loudspeaker negative interface, the first end of the second reference resistor is connected with the second loudspeaker negative interface, switching time of the reference resistor in the impedance measurement process can be shortened, and efficiency is improved.
Description
Technical Field
The application relates to the technical field of testing, in particular to an impedance box and an impedance system for measuring loudspeaker impedance.
Background
At present, speakers such as smart wear, smart home, etc. are included in electronic products, and impedance of the speakers is a main performance parameter of the speakers, so that the speakers need to measure their impedance curve in the design process.
Many key parameters can be derived using the impedance curve of the loudspeaker. The existing loudspeaker impedance measuring method is a voltage division method, a loudspeaker to be measured is connected with a reference resistor in series to divide voltage, and the passing current is calculated, so that an impedance curve in the working process of the loudspeaker is converted. The common nominal impedance of the loudspeaker is 2-32 omega, the selection standard of the reference resistor is 1/10-1/100 of the nominal impedance of the loudspeaker, and the replacement process of the reference resistor is time-consuming.
Moreover, before the impedance is measured by adopting a voltage division method, voltage calibration needs to be performed on the measurement system, and switching of the reference resistor during voltage calibration is time-consuming.
Disclosure of Invention
In view of this, the present application provides an impedance box and a system for measuring impedance of a speaker, which can reduce the switching time in the impedance measurement process and improve the efficiency.
The application provides an impedance box for measuring the impedance of a loudspeaker, comprising: the circuit comprises a first selection switch, a second selection switch, a first reference resistor and a second reference resistor;
the first end and the second end of the first reference resistor are respectively connected with the first moving contact of the first selection switch and the negative port of the amplifier;
the first end and the second end of the second reference resistor are respectively connected with the second moving contact of the first selection switch and the negative port of the amplifier;
a static contact of the first selection switch is connected with the first test port;
a fixed contact of the first selection switch is connected with a first movable contact of the second selection switch, and a second movable contact of the second selection switch is connected with a positive port of the amplifier;
a static contact of the second selector switch is connected with the second test port;
the first end of the first reference resistor is connected with the negative interface of the first loudspeaker, the first end of the second reference resistor is connected with the negative interface of the second loudspeaker, and the positive interface of the first loudspeaker, the positive interface of the second loudspeaker and the positive interface of the amplifier are connected together.
Preferably, when the impedance box is used for voltage calibration, the fixed contact of the first selection switch is connected with the first movable contact or the second movable contact of the first selection switch, and the first test port is used as a loudspeaker terminal voltage calibration interface.
Preferably, when the impedance box is used for voltage calibration, the fixed contact of the second selection switch is connected with the second movable contact of the second selection switch, and the second test port is used as an amplifier output end voltage calibration interface.
Preferably, when the impedance box is used for impedance measurement, the fixed contact of the second selection switch is connected with the first movable contact of the second selection switch, the fixed contact of the first selection switch is connected with the first movable contact or the second movable contact of the first selection switch, and the second test port is used as a reference resistance voltage division acquisition port.
Preferably, the first reference resistor has a resistance of 0.1 ohm and the second reference resistor has a resistance of 1 ohm.
The present application further provides a system for measuring speaker impedance, comprising: the impedance box of any one of claims 1 to 5 further comprising: a CPU, a sound card and an amplifier;
the CPU is used for setting the input voltage of the sound card;
the output end of the sound card is connected with the input end of the amplifier, and the output end of the amplifier is connected with the negative amplifier port and the positive amplifier port of the impedance box;
the first loudspeaker negative interface and the first loudspeaker positive interface of the impedance box are used for connecting a loudspeaker or a standard resistor;
or the like, or, alternatively,
the second speaker negative interface and the second speaker positive interface of the impedance box are used to connect a speaker or a standard resistor.
Preferably, the system is used for voltage calibration when the impedance box is connected to a standard resistor;
when the impedance box is connected to the loudspeaker, the system is used to measure the impedance of the loudspeaker.
Preferably, when the impedance box is connected with the loudspeaker, the CPU is further configured to obtain a voltage reference of a reference resistor, obtain a loop current I according to the reference resistor and the reference resistor, and obtain an impedance of the loudspeaker according to a voltage across the loudspeaker and the loop current I, where the reference resistor is the first reference resistor or the second reference resistor.
Preferably, when the impedance box is connected with the loudspeaker, the CPU is also used for obtaining the voltage Uparameter of a reference resistor, obtaining the loop current I according to the reference resistor and the Uparameter, and obtaining the impedance of the loudspeaker according to the output voltage of the amplifier, the Uparameter and the loop current I, wherein the reference resistor is a first reference resistor or a second reference resistor.
Preferably, the CPU is specifically configured to obtain a difference between the output terminal voltage of the amplifier and the reference U, and divide the difference by the loop current to obtain the impedance of the speaker.
Therefore, the application has the following beneficial effects:
the impedance box for measuring the impedance of the loudspeaker comprises two reference resistors, and the first reference resistor and the second reference resistor can be switched by shifting the gear of the first selection switch; the resistance value of the second reference resistor is ten times that of the first reference resistor, and the resistance value of the reference resistor is selected according to 1/10-1/100 of the nominal impedance of the loudspeaker to be tested, so that the impedance test requirements of most loudspeakers can be met. The application provides an impedance box of measurement speaker impedance realizes reference resistance's change through changing the switch gear, can measure the impedance curve of different speakers, has reduced the time that switches reference resistance among the impedance measurement process, raises the efficiency, convenient and fast.
Drawings
FIG. 1 is a schematic diagram of a system for measuring speaker impedance provided herein;
FIG. 2 is a schematic diagram of a system provided herein for voltage calibration;
fig. 3 is a circuit diagram of an impedance box according to an embodiment of the present application;
fig. 4 is a switching state diagram of an impedance box provided by an embodiment of the present application;
fig. 5 is another switching state diagram of the impedance box according to the embodiment of the present application.
Detailed Description
The impedance measuring method of the loudspeaker mainly adopts a voltage division method, namely, a reference resistor is connected in series with the loudspeaker to be measured, the voltage divided by the reference resistor is collected, the current flowing through the loudspeaker is calculated according to the voltage and the reference resistor, and the impedance curve in the working process of the loudspeaker is converted according to the current.
When an impedance curve of a loudspeaker is measured by a voltage division method, a proper reference resistor needs to be selected according to the nominal impedance of the loudspeaker; the reference resistor is typically 1/10 to 1/100 of the nominal impedance of the loudspeaker. The nominal impedance of a common loudspeaker is 2-32 omega, so that the reference resistor needs to be replaced when different loudspeakers are measured. The replacement process of the reference resistor is time consuming.
The application provides an impedance box for measuring loudspeaker impedance, including two reference resistance, can realize reference resistance's switching through the gear of stirring the select switch, switch reference resistance more convenient and fast, save time.
In order to more clearly understand the embodiments of the present application, a specific application scenario of the technical solution provided in the present application is described below.
Referring to fig. 1, a schematic diagram of a system for measuring speaker impedance is provided.
The system for measuring the impedance of the loudspeaker provided by the embodiment comprises: CPU100, sound card 200, amplifier 300, and impedance box 400.
When measuring the impedance of the loudspeaker, the impedance box 400 of the measuring system is used for connecting the loudspeaker to be measured; the CPU100 may set different voltages as needed, and the voltages are applied to the impedance box 400 after passing through the sound card 200 and the amplifier 300 in sequence. The sound card 200 collects the partial pressure of the reference resistor in the impedance box 400 and returns the partial pressure to the CPU100, and the CPU100 calculates to obtain the impedance curve of the speaker to be tested.
Because the voltage of the system needs to be calibrated in advance before the impedance is measured by the voltage division method, the impedance box provided by the application can be applied to the system for measuring the impedance of the loudspeaker to carry out voltage calibration and impedance measurement.
Referring to fig. 2, the figure is a schematic diagram of voltage calibration performed by the system provided in the present application.
The system for measuring the impedance of a speaker provided in this embodiment is used to connect a standard resistor to the impedance box 400 only when performing voltage calibration. The resistance value of the standard resistor is the resistance value corresponding to the nominal impedance of the loudspeaker to be tested.
When voltage calibration is performed, the following two ways are included: collecting the voltage at two ends of a loudspeaker and the voltage at the output end of an amplifier, wherein the CPU100 is required to set the input voltage U1 of the sound card 200, and collecting the voltage at two ends of the loudspeaker or the voltage U2 at the output end of the power amplifier to obtain a system loop gain coefficient k; thereby ensuring that when measuring the loudspeaker impedance, the CPU100 sets the corresponding input voltage U1= U2/k according to the required voltage U2.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the drawings are described in detail below.
Referring to fig. 3, the figure is a circuit diagram of an impedance box according to an embodiment of the present application.
The impedance box of measurement speaker impedance that this application embodiment provided includes: the circuit comprises a first selection switch S1, a second selection switch S2, a first reference resistor R1 and a second reference resistor R2. The resistance value of the second reference resistor R2 is ten times that of the first reference resistor R1. In addition, R1 may also be other multiples of R2, which is not specifically limited herein, and R2 is about ten times R1, so that test requirements of different speakers can be met.
The present application does not specifically limit the specific resistance values of the first reference resistor R1 and the second reference resistor R2. For example: the resistance value of the first reference resistor can be 0.1 omega, and the resistance value of the second reference resistor is 1 omega, and the resistance value of the reference resistor is selected according to 1/10-1/100 of the nominal impedance of the loudspeaker to be tested, so that the impedance box can measure the loudspeaker with the nominal impedance of 1 omega-100 omega, and the range of the nominal impedance of most common loudspeakers can be covered. The resistance value of the first reference resistor R1 and the resistance value of the second reference resistor R2 may take other values.
The first end and the second end of the first reference resistor R1 are respectively connected with the first moving contact c of the first selection switch S1 and the amplifier negative port AMP-.
The first end and the second end of the second reference resistor R2 are respectively connected with the second moving contact b of the first selection switch S1 and the amplifier negative port AMP-.
The stationary contact a of the first selector switch S1 is connected to the first test port a.
The fixed contact a of the first selection switch S1 is connected to the first movable contact e of the second selection switch S2, and the second movable contact f of the second selection switch S2 is connected to the amplifier positive port AMP +.
The stationary contact d of the second selection switch S2 is connected to the second test port B.
The first end of the first reference resistor R1 is connected with a first loudspeaker negative interface Z1-, and the first end of the second reference resistor R2 is connected with a second loudspeaker negative interface Z2-; the first positive loudspeaker interface Z1+, the second positive loudspeaker interface Z2+ and the positive amplifier port AMP + are connected together.
According to the connection mode, the impedance box provided by the embodiment of the application can switch the reference resistor by shifting the gear of the first selection switch S1; when the fixed contact a of the first selection switch S1 is connected to the first movable contact c of the first selection switch S1, it indicates that the first reference resistor R1 is selected; when the fixed contact a of the first selection switch S1 is connected to the second movable contact b of the first selection switch S1, it indicates that the second reference resistance R2 is selected.
When the first reference resistor R1 is used for testing, the loudspeaker to be tested is connected between the positive interface Z1+ of the first loudspeaker and the negative interface Z1-of the first loudspeaker; when the second reference resistor R2 is adopted for testing, the loudspeaker to be tested is connected between the positive interface Z2+ of the second loudspeaker and the negative interface Z2-of the second loudspeaker.
The impedance box for measuring the impedance of the loudspeaker comprises two reference resistors, and the first reference resistor and the second reference resistor can be switched by shifting the gear of a first selection switch; the resistance value of the second reference resistor is ten times that of the first reference resistor, and the resistance value of the reference resistor is selected according to 1/10-1/100 of the nominal impedance of the loudspeaker to be tested, so that the impedance test requirements of most loudspeakers can be met. The application provides an impedance box of measurement speaker impedance realizes the change of reference resistance through changing the switch gear, can measure the impedance curve of different speakers, has reduced the time that switches reference resistance among the impedance measurement process, raises the efficiency, convenient and fast.
Since the two voltage calibration methods correspond to two different impedance calculation methods, the following specifically describes a specific working mode of the impedance box provided by the embodiment of the present application when different impedance calculation methods are adopted, with reference to the accompanying drawings.
The first mode is as follows: voltage calibration and impedance measurement are performed using the voltage across the speaker. The first reference resistor is accessed as an example.
Referring to fig. 4, a diagram of a switching state of an impedance box provided in the embodiment of the present application is shown.
The fixed contact a of the first selection switch S1 is connected to the first movable contact c of the first selection switch S1, and represents that the first reference resistor R1 is selected; a fixed contact d of the second selection switch S2 is connected to a first movable contact e of the second selection switch S2; the first test port A is used as a loudspeaker terminal voltage calibration interface; the second test port B is used as a reference resistor voltage division acquisition interface.
At this time, the first end of the first test port a is connected with an amplifier positive port AMP +, and the amplifier positive port AMP + is connected with a first speaker positive interface Z1+; the second end of the first test port A is connected to a first loudspeaker negative interface Z1-through a first selector switch S1; therefore, the voltage tested by the first test port is the voltage across the loudspeaker for voltage calibration.
A first end of the second test port B is connected to a first end of the first reference resistor R1 through a second selection switch S2 and a first selection switch S1; the second end of the second test port B is connected with the second end of the first reference resistor R1; therefore, the voltage tested by the second test port is the voltage of the reference resistor, and is used for calculating the current to carry out impedance measurement.
In order to make those skilled in the art better understand the impedance box provided by the embodiments of the present application, the principle of impedance measurement is described below.
The voltage at two ends of the calibrated loudspeaker is U D (ii) a Through the second test terminalThe voltage division of the first reference resistor R1 acquired by the port is the reference voltage Uparameter.
The loop current I is then:
loudspeaker impedance R D Comprises the following steps:
the second mode is as follows: voltage calibration and impedance measurement are performed using the voltage collected from the amplifier output. The first reference resistor is accessed as an example.
Referring to fig. 5, another switch state diagram of the impedance box provided by the embodiment of the present application is shown.
The fixed contact a of the first selection switch S1 is connected to the first movable contact c of the first selection switch S1, and represents that the first reference resistor R1 is selected; a fixed contact d of the second selection switch S2 is connected to a second movable contact f of the second selection switch S2; the second test port B is used as an amplifier output voltage calibration interface.
At this time, the first end of the second test port B is connected to the amplifier positive port AMP + through the second selection switch S2; the second end of the second test port B is connected with the negative port AMP < - >; therefore, the voltage tested by the second test port is the voltage at the output end of the amplifier, and is used for voltage calibration.
After voltage calibration is carried out, a fixed contact d of the second selective switch S2 is connected to a first movable contact e of the second selective switch S2; and the second test port B is used as a reference resistance voltage division acquisition interface.
With continued reference to fig. 4, the first terminal of the second test port B is connected to the first terminal of the first reference resistor R1 through the second selection switch S2 and the first selection switch S1; the second end of the second test port B is connected with the second end of the first reference resistor R1; therefore, the voltage tested by the second test port is the voltage of the reference resistor, and is used for calculating the current to measure the impedance.
In order to make those skilled in the art better understand the impedance box provided by the embodiments of the present application, the principle of impedance measurement is described below.
The output end voltage of the amplifier after calibration is U A (ii) a And the voltage division of the first reference resistor R1 acquired through the second test port is the reference voltage Up.
The calculation formula of the loop current I is the same as the formula (1)
Loudspeaker impedance R D Comprises the following steps:
the impedance box for measuring the impedance of the loudspeaker can collect the voltages at two ends of the loudspeaker or the voltage at the output end of the amplifier through different gears of the first selector switch and the second selector switch to switch the voltage calibration mode, so that the requirements of different calculation modes for measuring the impedance of the loudspeaker are met, and the impedance box is more flexible and convenient.
Based on the impedance box for measuring the impedance of the speaker provided by the above embodiments, the embodiments of the present application further provide a system for measuring the impedance of the speaker, which is described in detail below with reference to the accompanying drawings.
With continuing reference to fig. 1 and 2, a system for measuring the impedance of a speaker provided by an embodiment of the present application includes: CPU100, sound card 200, amplifier 300 and impedance box 400 provided by the above embodiments.
The CPU100 is used to set the input voltage of the sound card 200.
The output of the sound card 200 is connected to the input of the amplifier 300, and the output of the amplifier 300 is connected to the amplifier negative port and the amplifier positive port of the impedance box 400.
The first speaker negative interface and the first speaker positive interface of the impedance box 400 are used to connect a speaker or a standard resistor;
or the like, or, alternatively,
the second speaker negative interface and the second speaker positive interface of the impedance box 400 are used to connect a speaker or a standard resistor.
When the impedance box 400 is connected with a standard resistor, the system provided by the embodiment of the application can perform voltage calibration; and the resistance value of the standard resistor is the resistance value corresponding to the nominal impedance of the loudspeaker to be tested.
When the impedance box 400 is connected to a speaker, the system provided by the embodiments of the present application can measure the impedance of the speaker.
When the first reference resistor is used for testing, the loudspeaker is connected between the first loudspeaker positive interface and the first loudspeaker negative interface; when the second reference resistor is used for testing, the loudspeaker is connected between the second loudspeaker positive interface and the second loudspeaker negative interface.
When the impedance box 400 is connected to the speaker, the CPU100 is further configured to obtain a voltage reference of the reference resistor, obtain a loop current I according to a resistance value of the reference resistor and the voltage reference of the reference resistor, and obtain a loop current I according to a voltage U across the speaker D And loop current I to obtain the impedance of the speaker; wherein the reference resistance is the first reference resistance or the second reference resistance in the impedance box.
When the impedance box 400 is connected to a speaker, the CPU100 may also be configured to obtain the reference resistance voltage usp, obtain the loop current I according to the reference resistance value and the reference resistance voltage usp, and obtain the output voltage U of the amplifier 300 according to the output voltage signal A The voltage USPEF of the reference resistor and the loop current I are used for obtaining the impedance of the loudspeaker; wherein the reference resistance is a first reference resistance or a second reference resistance in the impedance box; wherein, the CPU100 is specifically used for obtaining the output end voltage U of the amplifier 300 A And the difference value of the voltage and the voltage of the reference resistor USF is divided by the loop current to obtain the impedance of the loudspeaker.
The system for measuring the impedance of the loudspeaker adopts the impedance box to measure, the impedance box comprises two reference resistors, and the reference resistors can be switched in by switching the switch gear of the impedance box so as to measure the impedance of different loudspeakers. The application provides a system for measuring loudspeaker impedance realizes the change of reference resistance through changing the switch gear, can measure the impedance curve of different speakers, has reduced the time that switches reference resistance among the impedance measurement process, raises the efficiency, convenient and fast. In addition, the system provided by the embodiment of the application can select the voltage calibration mode by switching the switch gear of the impedance box, is more flexible, reduces the time for switching the voltage calibration mode, and further improves the efficiency.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An impedance box for measuring the impedance of a loudspeaker, comprising: the circuit comprises a first selection switch, a second selection switch, a first reference resistor and a second reference resistor;
the first end and the second end of the first reference resistor are respectively connected with the first moving contact of the first selection switch and the negative port of the amplifier;
the first end and the second end of the second reference resistor are respectively connected with the second movable contact of the first selection switch and the negative port of the amplifier;
a static contact of the first selection switch is connected with a first test port;
a fixed contact of the first selection switch is connected with a first movable contact of the second selection switch, and a second movable contact of the second selection switch is connected with the positive port of the amplifier;
a static contact of the second selector switch is connected with a second test port;
the first end of the first reference resistor is connected with a first loudspeaker negative interface, the first end of the second reference resistor is connected with a second loudspeaker negative interface, and the first loudspeaker positive interface, the second loudspeaker positive interface and the amplifier positive interface are connected together.
2. The impedance box of claim 1, wherein when the impedance box is used for voltage calibration, the fixed contact of the first selection switch is connected with the first movable contact or the second movable contact of the first selection switch, and the first test port is used as a loudspeaker terminal voltage calibration interface.
3. The impedance box of claim 1, wherein when the impedance box is used for voltage calibration, the fixed contact of the second selection switch is connected with the second movable contact of the second selection switch, and the second test port is used as an amplifier output voltage calibration interface.
4. The impedance box according to claim 1, wherein when the impedance box is used for impedance measurement, the fixed contact of the second selective switch is connected with the first movable contact of the second selective switch, the fixed contact of the first selective switch is connected with the first movable contact or the second movable contact of the first selective switch, and the second test port is used as a reference resistance partial pressure acquisition port.
5. An impedance box according to any of claims 1 to 3, wherein the first reference resistor has a value of 0.1 ohms and the second reference resistor has a value of 1 ohm.
6. A system for measuring the impedance of a loudspeaker, comprising: the impedance box of any of claims 1-5, further comprising: a CPU, a sound card and an amplifier;
the CPU is used for setting the input voltage of the sound card;
the output end of the sound card is connected with the input end of the amplifier, and the output end of the amplifier is connected with the negative port and the positive port of the amplifier of the impedance box;
the first loudspeaker negative interface and the first loudspeaker positive interface of the impedance box are used for connecting a loudspeaker or a standard resistor;
or the like, or a combination thereof,
and the second loudspeaker negative interface and the second loudspeaker positive interface of the impedance box are used for connecting a loudspeaker or a standard resistor.
7. The system of claim 6, wherein the system is configured to perform voltage calibration when the impedance box is connected to the reference resistor;
the system is configured to measure the impedance of the speaker when the impedance box is connected to the speaker.
8. The system according to claim 7, wherein when the impedance box is connected to the speaker, the CPU is further configured to obtain a voltage reference of a reference resistor, obtain a loop current I according to the reference resistor and the reference resistor, and obtain the impedance of the speaker according to the voltage across the speaker and the loop current I, where the reference resistor is the first reference resistor or the second reference resistor.
9. The system of claim 7, wherein when the impedance box is connected to the speaker, the CPU is further configured to obtain a voltage usf of the reference resistor, obtain a loop current I from the reference resistor and the usf, and obtain the impedance of the speaker from the output voltage of the amplifier, the usf, and the loop current I, wherein the reference resistor is the first reference resistor or the second reference resistor.
10. The system of claim 9, wherein the CPU is configured to obtain a difference between the output voltage of the amplifier and the reference U, and to divide the difference by the loop current to obtain the impedance of the speaker.
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| US6064742A (en) * | 1997-08-04 | 2000-05-16 | Gold Line Connector, Inc. | Audio impedance/calculated power meter |
| JP2008085476A (en) * | 2006-09-26 | 2008-04-10 | Patoraito:Kk | Alarm tone generator |
| CN103338429A (en) * | 2013-06-25 | 2013-10-02 | 歌尔声学股份有限公司 | Device and method for measuring impedance of loudspeaker |
| IT201900015144A1 (en) * | 2019-08-28 | 2021-02-28 | St Microelectronics Srl | PROCEDURE FOR MONITORING ELECTRICAL LOADS, CIRCUIT, AMPLIFIER AND CORRESPONDING AUDIO SYSTEM |
| CN114449433A (en) * | 2022-02-25 | 2022-05-06 | 展讯通信（上海）有限公司 | Method, device, chip and module equipment for calibrating model parameters of loudspeaker |
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