CN105467219A - Load impedance measuring system and method - Google Patents
Load impedance measuring system and method Download PDFInfo
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- CN105467219A CN105467219A CN201410448127.XA CN201410448127A CN105467219A CN 105467219 A CN105467219 A CN 105467219A CN 201410448127 A CN201410448127 A CN 201410448127A CN 105467219 A CN105467219 A CN 105467219A
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Abstract
The invention discloses a load impedance measuring system and a load impedance measuring method. The load impedance measuring system is applied to a load resistor, and comprises a switching module, a first reference resistor, a second reference resistor and a control module. The switching module is connected with the first reference resistor, the second reference resistor and the load resistor. The control module is connected to the switching module. The control module obtains a first voltage value through controlling the switching module to be connected with the first reference resistor, obtains a second voltage value through controlling the switching module to be connected with the second reference resistor, obtains a load voltage value through controlling the switching module to be connected with the load resistor, and calculates a measured value of load impedance according to the first voltage value, the second voltage value and the load voltage value. The load impedance measuring system and the load impedance measuring method can adjust parameters of sound effect, so as to optimize the sense of hearing.
Description
Technical field
The present invention relates to a kind of loaded impedance measuring system and method.
Background technology
Along with the progress of science and technology, the evolution of the personal computer and the Internet and the development of digital audio and video signals process, DAB is play and has been applied to various electronic system as sound equipments such as cinema, family expenses, automobiles, and Digital Television, various types computer, walkman, mobile phone etc.Wherein the function of audio-signal-driven must possess the characteristic of low noise, high-quality, makes acoustics more perfect.Moreover in order to sound signal be intactly transformed on loaded impedance (i.e. loudspeaker or earphone), audio-signal-driven system can first measured load impedance value, uses the parameter of adjustment audio, makes sense of hearing optimization.
Figure 1A and Figure 1B is a schematic diagram, and the Organization Chart of general measure loaded impedance is described.Figure 1A is the technology that a kind of loaded impedance is measured.With reference to Figure 1A, a current source 11 is supplied on a fixed current I to a loaded impedance R, and then the value of the magnitude of voltage Vout of measured load impedance R, loaded impedance R can be tried to achieve divided by fixed current I by magnitude of voltage Vout thus.As shown in Figure 1B, Figure 1B illustrates the bridgt circuit be made up of four impedances R1, R2, R3 and R4 to the technology that another kind of loaded impedance is measured, a voltage source supplies one voltage V
bbetween the tie point of R3 and R4 and the tie point of R1 and R2.In fig. ib, loaded impedance R1 is impedance to be measured, R2 and R3 is particular value impedance, and R4 is adjustable impedance.The technology of this impedance measurement is the impedance of adjustment R4, until the cross-pressure value (Vo) measured between the tie point of R1 and R4 and the tie point of R3 and R2 is zero, then loaded impedance R1 can be tried to achieve by R1=R4*R2/R3.
In the technology of the measured load impedance of Figure 1A, fixed current value I needs Measurement accuracy or learns, just can try to achieve the value of loaded impedance R.And in the technology of the measured load impedance of Figure 1B, need measure cross-pressure value (Vo) is after zero, then the impedance R4 of Measurement accuracy adjustment, finally just can try to achieve the value of loaded impedance R1.The technology of this kind of measured load impedance is extremely complicated.
Therefore, for improving the above-mentioned shortcoming that must know the complicated measuring technique of current value and adjustment resistance value, the present invention proposes the technology that a kind of loaded impedance is measured.
Summary of the invention
The embodiment of the present invention can provide the system and method measured about a kind of loaded impedance.
A disclosed embodiment is about a kind of loaded impedance measuring system, is applied to a loaded impedance.This system comprises a switch module, one first reference impedance, one second reference impedance and a control module.This switch module connects this first reference impedance, this second reference impedance and this loaded impedance respectively.This control module connects this switch module.This control module obtains one first magnitude of voltage via this switch module of control to connect this first reference impedance, this control module obtains one second magnitude of voltage via this switch module of control to connect this second reference impedance, this control module is via this switch module of control to connect this loaded impedance to obtain a load voltage values, and this control module calculates the measured value of loaded impedance according to this first magnitude of voltage, this second magnitude of voltage and this load voltage values.
Another disclosed embodiment is that be applied to a loaded impedance, the method comprises about a kind of loaded impedance measuring method: use a control module to obtain one first magnitude of voltage via control one switch module to connect one first reference impedance; This control module is used to obtain one second magnitude of voltage via this switch module of control to connect one second reference impedance; Use this control module via this switch module of control to connect loaded impedance to obtain a load voltage values; And this control module calculates the measured value of loaded impedance according to the first magnitude of voltage, the second magnitude of voltage and load voltage values.
Hereby coordinate detailed description and the claim of following accompanying drawing, embodiment, by address after other advantages of the present invention are specified in.
Accompanying drawing explanation
Figure 1A and Figure 1B is a schematic diagram, and the Organization Chart of general measure loaded impedance is described.
Fig. 2 implements the consistent schematic diagram of example with disclosed one, a kind of loaded impedance measuring system is described.
Fig. 3 implements the consistent schematic diagram of example with disclosed one, the circuit framework of key diagram 2 breaker in middle module.
Fig. 4 implements the consistent schematic diagram of example with disclosed one, the control module in key diagram 2 obtains one first magnitude of voltage, the second magnitude of voltage and load voltage values via gauge tap module.
Fig. 5 implements the consistent schematic diagram of example with disclosed one, provide the sequential of fixed current and each magnitude of voltage of measurement in key diagram 4.
Fig. 6 implements the consistent schematic diagram of example with disclosed one, illustrate that control module calculates the measured value of loaded impedance.
Fig. 7 implements the consistent schematic diagram of example with disclosed one, a kind of loaded impedance measuring method is described.
Wherein, description of reference numerals is as follows:
200 loaded impedance measuring system 210 switch modules
220 first reference impedance 230 second reference impedances
240 control module 250 loaded impedances
260 first magnitude of voltage 270 second magnitudes of voltage
280 load voltage values 310 control signals
410 control signal generator 420 fixed current sources
421 fixed current 430 Voltage measure
510 ~ 530 signal 560 ~ 580 signals
610 intersection point 620 intersection points
630 straight line 640 intersection points
710 use a control module to obtain one first magnitude of voltage via control one switch module to connect one first reference impedance
720 use this control module to obtain one second magnitude of voltage via this switch module of control to connect one second reference impedance
730 use this control module via this switch module of control to connect loaded impedance to obtain a load voltage values
740 control modules calculate the measured value of loaded impedance according to the first magnitude of voltage, the second magnitude of voltage and load voltage values
Embodiment
The present invention proposes the technology that a kind of loaded impedance is measured.Fig. 2 implements the consistent schematic diagram of example with disclosed one, a kind of loaded impedance measuring system is described.As shown in loaded impedance measuring system in Fig. 2, system 200 is applied to a loaded impedance, and system 200 comprises switch module 210,1 first reference impedance 220,1 second reference impedance 230 and a control module 240.Switch module 210 connects the first reference impedance 220, second reference impedance 230 and loaded impedance 250 respectively.Control module 240 connecting valve module 210.Control module 240 obtains one first magnitude of voltage 260 via gauge tap module 210 to connect the first reference impedance 220.Control module 240 obtains one second magnitude of voltage 270 via gauge tap module 210 to connect the second reference impedance 230.Control module 240 obtains a load voltage values 280 via gauge tap module 210 to connect loaded impedance 250.Control module 240 calculates the measured value of loaded impedance according to the first magnitude of voltage 260, second magnitude of voltage 270 and load voltage values 280.
According to the enforcement example of loaded impedance measuring system in Fig. 2, wherein switch module 210 is for connecting the first reference impedance 220, second reference impedance 230 and loaded impedance 250 respectively.Fig. 3 implements the consistent schematic diagram of example with disclosed one, the circuit framework of key diagram 2 breaker in middle module 210.As shown in Figure 3, the circuit framework of switch module 210 can be such as be made up of six derailing switches S1, S2, S3, S4, S5 and S6, wherein derailing switch S1 with S2 is for allowing control module 240 be connected the first reference impedance 220, derailing switch S3 with S4 is for allowing control module 240 be connected the second reference impedance 230, and derailing switch S5 with S6 is for allowing control module 240 be connected loaded impedance 250.Opening or closing of above-mentioned six derailing switches, i.e. open circuit (disconnection) or short circuit (connection) are controlled via control signal 310 by control module 240, as shown in Figure 3.
Hold above-mentioned, in the enforcement example of the loaded impedance measuring system of Fig. 2, control module 240 connecting valve module 210, via control signal 310 come respectively gauge tap device S1 with S2, S3 with S4 and S5 with S6 to be connected the first reference impedance 220, second reference impedance 230 and loaded impedance 250 obtains one first magnitude of voltage 260, second magnitude of voltage 270 and load voltage values 280.Fig. 4 implements the consistent schematic diagram of example with disclosed one, the control module 240 in key diagram 2 obtains one first magnitude of voltage 260, second magnitude of voltage 270 and load voltage values 280 via gauge tap module 210.As shown in Figure 4, control module 240 comprises control signal generator 410, fixed current source 420 and a Voltage measure 430.
With reference to figure 4, fixed current source 420 can produce a fixed current 421 and put on the first reference impedance 220, second reference impedance 230 and loaded impedance 250.Voltage measure 430 can measure the magnitude of voltage applying fixed current 421 and produce in the first reference impedance 220, second reference impedance 230 and loaded impedance 250.And control signal generator 410 can produce control signal 310 with the disconnection of gauge tap module 210 breaker in middle device S1 ~ S6 or connection.Such as control signal 310 can make fixed current source 420 provide fixed current 421 in the first reference impedance 220 by gauge tap device S1, and gauge tap device S2 makes Voltage measure 430 can measure the voltage of the first reference impedance 220, is the first magnitude of voltage 260.Control signal 310 also controllable switch device S3 makes fixed current source 420 provide fixed current 421 in the second reference impedance 230, and gauge tap device S4 makes Voltage measure 430 can measure the voltage of the second reference impedance 230, is the second magnitude of voltage 270.Final control signal 310 also controllable switch device S5 makes fixed current source 420 provide fixed current 421 in loaded impedance 250, and gauge tap device S6 makes Voltage measure 430 can the voltage of measured load impedance 250, is load voltage values 280.
Hold above-mentioned, the time that in Fig. 4, the Voltage measure 430 of control module measures each magnitude of voltage can coordinate fixed current source 420 to provide the sequential of fixed current 421.Fig. 5 implements the consistent schematic diagram of example with disclosed one, provide the sequential of fixed current and each magnitude of voltage of measurement in key diagram 4.As shown in Figure 5, signal 510 represents that fixed current source 420 is supplied to the wave mode of the fixed current 421 of the first reference impedance 220; Signal 520 represents that fixed current source 420 is supplied to the wave mode of the fixed current 421 of the second reference impedance 230; Signal 530 represents that fixed current source 420 is supplied to the wave mode of the fixed current 421 of loaded impedance 250, the wave mode of signal 530 has one section of phases-time T rising and decline, this phases-time T is such as between 100 milliseconds (ms) and 300 milliseconds (ms), produces discordant sonic boom to avoid fixed current on loaded impedance.In Figure 5, signal 560 represents the wave mode of the magnitude of voltage of measurement first reference impedance 220, and each arrow wherein in signal 560 represents each sampling time point to measure the magnitude of voltage of the first reference impedance 220; Signal 570 represents the wave mode of the magnitude of voltage of measurement second reference impedance 230, and each arrow wherein in signal 570 represents each sampling time point to measure the magnitude of voltage of the second reference impedance 230; Signal 580 represents the wave mode of the magnitude of voltage of measured load impedance 250, and each arrow wherein in signal 580 represents that each sampling time point carrys out the magnitude of voltage of measured load impedance 250.Remake average after the magnitude of voltage of multiple first reference impedances measured by above-mentioned multiple sampling time point can always add, become the first magnitude of voltage; And the magnitude of voltage of multiple second reference impedances measured by multiple sampling time point remakes average after can also always adding, become the second magnitude of voltage; Remake average after the magnitude of voltage of the multiple loaded impedances measured by multiple sampling time point can also always add, become load voltage values.
Hold above-mentioned, control module can calculate the measured value of loaded impedance according to the first magnitude of voltage, the second magnitude of voltage and load voltage values.Fig. 6 implements the consistent schematic diagram of example with disclosed one, illustrate that control module calculates the measured value of loaded impedance.With reference to figure 6, suppose that the first reference impedance is R
a, the second reference impedance is R
b, loaded impedance is R
x; And the first magnitude of voltage that control module is measured is V
a, the second magnitude of voltage is V
b, and load voltage values is V
x.Then loaded impedance R
xcan by Fig. 6 linearly to try to achieve.The longitudinal axis is resistance value in figure 6, and transverse axis is magnitude of voltage.First mark the first reference impedance R
awith the first magnitude of voltage V
aintersection point 610, then mark the second reference impedance R
bwith the second magnitude of voltage V
bintersection point 620.By setting up a straight line 630 between intersection point 610 and intersection point 620.Again by load voltage values V
xfind intersection point 640 with straight line 630, and then on the longitudinal axis, obtain loaded impedance be R
x.
Hold above-mentioned, Fig. 6 schematically tries to achieve loaded impedance R
xmeasured value.Another kind of mode is to calculate loaded impedance R with linear ratio
xmeasured value.Such as try to achieve with following formula:
R
x＝R
a+(R
b–R
a)(V
x–V
a)/(V
b-V
a)。
Example is implemented according to another, Fig. 7 illustrates a kind of loaded impedance measuring method, be applied to a loaded impedance, the method comprises: use a control module to obtain one first magnitude of voltage (step 710) via control one switch module to connect one first reference impedance; This control module is used to obtain one second magnitude of voltage (step 720) via this switch module of control to connect one second reference impedance; Use this control module via this switch module of control to connect loaded impedance to obtain a load voltage values (step 730); And this control module calculates the measured value (step 740) of loaded impedance according to the first magnitude of voltage, the second magnitude of voltage and load voltage values.
As previously mentioned, the switch module that Fig. 7 uses can be such as be made up of six derailing switches.Control module can utilize a control signal to control this switch module.And control module can apply a fixed current respectively in the first reference impedance, the second reference impedance and loaded impedance, and a voltage measurement is used to obtain the first magnitude of voltage, the second magnitude of voltage and load voltage values respectively.In the figure 7, the measured value of the loaded impedance calculated can be to calculate the measured value of loaded impedance with linear ratio.
In sum, the present invention proposes a kind of loaded impedance measuring system and method, makes audio-signal-driven system first can measure load impedance value, uses the parameter of adjustment audio, makes sense of hearing optimization.
As described above is all only the embodiment of the present invention, can not limit scope of the invention process according to this.Generally the equalization that the claims in the present invention are done changes and modifies, and all should belong to the scope that patent of the present invention contains.
Claims (12)
1. a loaded impedance measuring system, is applied to a loaded impedance, and this system comprises a switch module, one first reference impedance, one second reference impedance and a control module:
This switch module, connects this first reference impedance, this second reference impedance and this loaded impedance respectively;
This control module obtains one first magnitude of voltage via this switch module of control to connect this first reference impedance; This control module obtains one second magnitude of voltage via this switch module of control to connect this second reference impedance; This control module is via controlling this switch module to connect loaded impedance to obtain a load voltage values; And this control module calculates the measured value of loaded impedance according to this first magnitude of voltage, this second magnitude of voltage and this load voltage values.
2. the system as claimed in claim 1, wherein this switch module is made up of six derailing switches.
3. the system as claimed in claim 1, wherein this control module comprises a control signal generator and produces a control signal, controls this switch module.
4. the system as claimed in claim 1, wherein this control module comprises a fixed current source, and this fixed current source applies a fixed current respectively in this first reference impedance, this second reference impedance and this loaded impedance.
5. the system as claimed in claim 1, wherein this control module comprises a Voltage measure, and this Voltage measure obtains this first magnitude of voltage, this second magnitude of voltage and this load voltage values respectively.
6. the system as claimed in claim 1, wherein this control module schematically or linear ratio's mode, calculates the measured value of loaded impedance.
7. a loaded impedance measuring method, be applied to a loaded impedance, the method comprises:
A control module is used to obtain one first magnitude of voltage via control one switch module to connect one first reference impedance;
This control module is used to obtain one second magnitude of voltage via this switch module of control to connect one second reference impedance;
Use this control module via this switch module of control to connect this loaded impedance to obtain a load voltage values; And
This control module calculates the measured value of this loaded impedance according to this first magnitude of voltage, this second magnitude of voltage and this load voltage values.
8. method as claimed in claim 7, wherein this switch module is made up of six derailing switches.
9. method as claimed in claim 7, wherein this control module utilizes a control signal to control this switch module.
10. method as claimed in claim 7, wherein this control module applies a fixed current respectively in this first reference impedance, this second reference impedance and this loaded impedance.
11. methods as claimed in claim 7, wherein this control module utilizes a voltage measurement to obtain this first magnitude of voltage, this second magnitude of voltage and this load voltage values respectively.
12. systems as claimed in claim 7, wherein this control module schematically or linear ratio's mode calculate the measured value of loaded impedance.
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| CN201410448127.XA CN105467219A (en) | 2014-09-04 | 2014-09-04 | Load impedance measuring system and method |
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|---|---|---|---|
| CN201410448127.XA CN105467219A (en) | 2014-09-04 | 2014-09-04 | Load impedance measuring system and method |
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| CN105467219A true CN105467219A (en) | 2016-04-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111726733A (en) * | 2019-03-19 | 2020-09-29 | 北京小米移动软件有限公司 | Electronic device, audio output control method, audio output control device, and storage medium |
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| DE3101994A1 (en) * | 1980-12-18 | 1982-07-08 | LGZ Landis & Gyr Zug AG, 6301 Zug | Method and device for measuring an electrical resistance |
| CN1373889A (en) * | 1999-09-14 | 2002-10-09 | 国际商业机器公司 | Ratio method for measurement of MR read head resistance |
| CN2702317Y (en) * | 2003-12-02 | 2005-05-25 | 赵军 | Resistance instrument scaling method calibration circuit |
| CN102288831A (en) * | 2011-05-16 | 2011-12-21 | 钟小梅 | Low-cost high-accuracy resistance measuring system and measuring method thereof |
| CN202994905U (en) * | 2012-11-27 | 2013-06-12 | 比亚迪股份有限公司 | Resistance measuring circuit |
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2014
- 2014-09-04 CN CN201410448127.XA patent/CN105467219A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3101994A1 (en) * | 1980-12-18 | 1982-07-08 | LGZ Landis & Gyr Zug AG, 6301 Zug | Method and device for measuring an electrical resistance |
| CN1373889A (en) * | 1999-09-14 | 2002-10-09 | 国际商业机器公司 | Ratio method for measurement of MR read head resistance |
| CN2702317Y (en) * | 2003-12-02 | 2005-05-25 | 赵军 | Resistance instrument scaling method calibration circuit |
| CN102288831A (en) * | 2011-05-16 | 2011-12-21 | 钟小梅 | Low-cost high-accuracy resistance measuring system and measuring method thereof |
| CN202994905U (en) * | 2012-11-27 | 2013-06-12 | 比亚迪股份有限公司 | Resistance measuring circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111726733A (en) * | 2019-03-19 | 2020-09-29 | 北京小米移动软件有限公司 | Electronic device, audio output control method, audio output control device, and storage medium |
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Application publication date: 20160406 |