CN108828315A - Mobile terminal loudspeaker impedance measuring circuit, speaker circuit and mobile terminal - Google Patents
Mobile terminal loudspeaker impedance measuring circuit, speaker circuit and mobile terminal Download PDFInfo
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- CN108828315A CN108828315A CN201810706005.4A CN201810706005A CN108828315A CN 108828315 A CN108828315 A CN 108828315A CN 201810706005 A CN201810706005 A CN 201810706005A CN 108828315 A CN108828315 A CN 108828315A
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- mobile terminal
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- loudspeaker
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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
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Abstract
A kind of mobile terminal loudspeaker impedance measuring circuit that the embodiment of the present invention proposes, speaker circuit and mobile terminal, when measuring the loudspeaker impedance in speaker circuit, the connection of mobile terminal power supply Yu Mobile terminal main board internal circuit is separated by the power isolation circuit of setting, the connection of mobile terminal power amplifier and loudspeaker has been isolated by the power amplifier isolation circuit of setting, power amplifier is avoided to interference caused by loudspeaker impedance measurement, and connect the external interface of loudspeaker and mobile terminal by measuring circuit, so that when measuring loudspeaker impedance without tearing machine open, it need to only be measured in external interface, it is easy to operate, reduce the human cost and Material Cost of after-sales service, avoid speaker damage risk caused by the machine of tearing open.
Description
Technical field
The present invention relates to mobile terminal speaker technology fields, and in particular to mobile terminal loudspeaker impedance measuring circuit,
Speaker circuit and mobile terminal.
Background technique
With continuing to introduce new for terminal manufacturing process, the function of mobile terminal is more and more abundant, can satisfy user
More and more demands, one of the application of music as mobile terminal is also increasingly by the favor of user, in mobile terminal
Earphone and loudspeaker are essential two parts, use of the loudspeaker in mobile terminal user as the carrier of music in design
Frequency is very extensive, such as video playing, call, music, and the module so high as frequency of use is if there is damage
It is bad to bring great inconvenience to users, faster to the maintenance speed of speaker damage problem after sale, the likability of user
Better, so how to improve, the investigation whether damaged loudspeaker is particularly important, and loudspeaker whether damage one is important
Judgment criteria is the impedance value of loudspeaker monomer, the impedance value of loudspeaker monomer in a certain range when (such as 4 Ω -8 Ω) it is basic
It can determine that loudspeaker monomer is without exception.
The usual way of loudspeaker monomer impedance measurement at present is：Terminal body is dismantled first, is then dismantled and is raised again
Sound device monomer, then loudspeaker impedance is measured with multimeter, loudspeaker is installed back if needs without exception are intact again
It goes.
Although technology conventionally used at present can bring following problems with the impedance of accurately measure loudspeaker：
(1) it needing to tear machine open, the machine of tearing open will be brought very to unpredictable risk, and increasing with non-removable mobile terminal,
The machine of tearing open but will increase the difficulty of after-sales service；(2) increase of after cost：The machine of tearing open will necessarily bring human cost and Material Cost
Increase；(3) there are speaker damage risks：Loudspeaker disassembly and the risk that can bring speaker damage is installed again.
Summary of the invention
In order to solve the above-mentioned technical problem or it at least is partially solved above-mentioned technical problem, the embodiment of the invention provides
A kind of mobile terminal loudspeaker impedance measuring circuit, speaker circuit and mobile terminal.
In view of this, being used in a first aspect, the embodiment of the present invention provides a kind of mobile terminal loudspeaker impedance measuring circuit
The impedance of loudspeaker in mobile terminal is measured, the mobile terminal also has external interface, including：Isolated from power electricity
Road, power amplifier isolation circuit and measuring circuit；
The control terminal of the control terminal of power isolation circuit, the control terminal of power amplifier isolation circuit and measuring circuit is distinguished
It is connect with the control terminal of external interface；
The isolation terminal of power isolation circuit is connect with mobile terminal power supply line and mobile terminal power management chip respectively；
The isolation terminal of power amplifier isolation circuit is connect with mobile terminal power amplifier and mobile terminal loudspeaker respectively；
The measurement terminal of measuring circuit is connect with the measurement terminal of external interface and mobile terminal loudspeaker respectively；
The control terminal of power isolation circuit receives the control signal that the control terminal of external interface issues, isolated from power electricity
The isolation terminal on road disconnects the connection of mobile terminal power supply line and mobile terminal power management chip；
The control terminal of power amplifier isolation circuit receives the control signal that the control terminal of external interface issues, power amplifier isolation electricity
The isolation terminal on road disconnects the connection of mobile terminal power amplifier and mobile terminal loudspeaker；
The control terminal of measuring circuit receives the control signal that the control terminal of external interface issues, the measurement of measuring circuit
Terminal connects the measurement terminal of external interface and the connection of mobile terminal loudspeaker.
The power isolation circuit includes first switch tube；
The grid of the first switch tube passes through the control terminal of the power isolation circuit and the control terminal of external interface
Son connection；
The first isolation terminal and mobile terminal power supply that the source electrode of the first switch tube passes through the power isolation circuit
Line connection；
The second isolation terminal and mobile terminal power supply that the drain electrode of the first switch tube passes through the power isolation circuit
Managing chip connection；
The power amplifier isolation circuit includes second switch and third switching tube；
The grid of the grid of the second switch and third switching tube passes through the control terminal of power amplifier isolation circuit and outer
The control terminal of connection interface connects；
The first isolation terminal and mobile terminal power amplifier that the source electrode of the second switch passes through the power amplifier isolation circuit
Connection；
Second isolation terminal and mobile terminal loudspeaking of the drain electrode of the second switch by the power amplifier isolation circuit
The anode connection of device；
The third isolation terminal and mobile terminal power amplifier that the source electrode of the third switching tube passes through the power amplifier isolation circuit
Connection；
Fourth isolation terminal and mobile terminal loudspeaking of the drain electrode of the third switching tube by the power amplifier isolation circuit
The cathode of device connects.
The first switch tube is PMOS switch pipe.
The second switch and third switching tube are PMOS switch pipes.
The measuring circuit includes the 4th switching tube and the 5th switching tube；
The grid of 4th switching tube and the grid of the 5th switching tube are connect by the control terminal of measuring circuit with external
The control terminal connection of mouth；
The source electrode of 4th switching tube passes through the first measurement terminal of measuring circuit and the first measurement end of external interface
Son connection；
The drain electrode of 4th switching tube is connected by the third measurement terminal and mobile terminal loudspeaker anode of measuring circuit
It connects；
5th source electrode to open the light passes through the second measurement terminal of measuring circuit and the second measurement terminal of external interface
Connection；
The drain electrode of 5th switching tube is connected by the 4th measurement terminal and mobile terminal loudspeaker cathode of measuring circuit
It connects.
4th switching tube and the 5th switching tube are NMOS switch pipes.
Second aspect, the embodiment of the present invention provide a kind of mobile terminal speaker circuit, including：The mobile terminal is raised
Sound device impedance measuring circuit, power amplifier and loudspeaker.
The third aspect, the embodiment of the present invention provide a kind of mobile terminal, including the mobile terminal speaker circuit, outside
Connection interface, power supply and power management chip；
The power supply passes sequentially through power management chip and power amplifier is connect with loudspeaker.
The external interface is Type-c interface.
Compared with prior art, a kind of mobile terminal loudspeaker impedance measuring circuit that the embodiment of the present invention proposes, is measuring
When loudspeaker impedance, the company of mobile terminal power supply Yu Mobile terminal main board internal circuit has been separated by the way that power isolation circuit is arranged
It connects, the connection of mobile terminal power amplifier and loudspeaker has been isolated in setting power amplifier isolation circuit, avoids power amplifier and surveys to loudspeaker impedance
It is interfered caused by amount, and connects the external interface of loudspeaker and mobile terminal by measuring circuit, so that in measurement loudspeaking
Without tearing machine open when device impedance, need to only measure in external interface, it is easy to operate, reduce the human cost of after-sales service with
Material Cost avoids speaker damage risk caused by the machine of tearing open；
The mobile terminal speaker circuit that the embodiment of the present invention proposes, the loudspeaker impedance in measurement speaker circuit
When, separated in mobile terminal power supply and Mobile terminal main board by the power isolation circuit that loudspeaker impedance measuring circuit is arranged
Mobile terminal power amplifier and loudspeaking has been isolated in the connection of portion's circuit, the power amplifier isolation circuit being arranged by loudspeaker impedance measuring circuit
The connection of device avoids power amplifier to interference caused by loudspeaker impedance measurement, and by loudspeaker impedance measuring circuit
Measuring circuit connects the external interface of loudspeaker and mobile terminal, so that only needing when measuring loudspeaker impedance without tearing machine open
It is measured in external interface, it is easy to operate, the human cost and Material Cost of after-sales service are reduced, the machine of tearing open is avoided and makes
At speaker damage risk；
The mobile terminal that the embodiment of the present invention proposes passes through loudspeaking when measuring the impedance of the loudspeaker in mobile terminal
The power isolation circuit that loudspeaker impedance measuring circuit is arranged in device circuit has separated mobile terminal power supply and Mobile terminal main board
The connection of internal circuit, the power amplifier isolation circuit being arranged by loudspeaker impedance measuring circuit have been isolated mobile terminal power amplifier and have been raised
The connection of sound device avoids power amplifier to interference caused by loudspeaker impedance measurement, and by loudspeaker impedance measuring circuit
Measuring circuit connect the external interface of loudspeaker and mobile terminal so that when measure loudspeaker impedance without tearing machine open,
It need to be measured in external interface, it is easy to operate, the human cost and Material Cost of after-sales service are reduced, the machine of tearing open is avoided
Caused by speaker damage risk.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be in embodiment or description of the prior art
Required attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the invention
Example is applied, it for those of ordinary skill in the art, without any creative labor, can also be attached according to these
Figure obtains other attached drawings.
The hardware structural diagram of Fig. 1 each embodiment one optional mobile terminal to realize the present invention；
Fig. 2 is the communication system schematic diagram of mobile terminal in Fig. 1；
Fig. 3 is a kind of schematic diagram of mobile terminal loudspeaker impedance measuring circuit provided by the invention；
Fig. 4 is a kind of mobile terminal speaker circuit schematic illustration provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram for the mobile terminal that another embodiment of the present invention provides.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The mobile terminal of each embodiment of the present invention is realized in description with reference to the drawings.In subsequent description, use
For indicate element such as " module ", " component " or " unit " suffix only for being conducive to explanation of the invention, itself
There is no specific meanings.Therefore, " module " can be used mixedly with " component ".
Mobile terminal can be implemented in a variety of manners.For example, terminal described in the present invention may include such as moving
Phone, smart phone, laptop, digit broadcasting receiver, PDA (personal digital assistant), PAD (tablet computer), PMP
The mobile terminal of (portable media player), navigation device etc. and such as number TV, desktop computer etc. are consolidated
Determine terminal.Hereinafter it is assumed that terminal is mobile terminal.However, it will be understood by those skilled in the art that in addition to being used in particular for moving
Except the element of purpose, the construction of embodiment according to the present invention can also apply to the terminal of fixed type.
The hardware structural diagram of Fig. 1 mobile terminal of each embodiment to realize the present invention.
Mobile terminal 100 may include wireless communication unit 110, A/V (audio/video) input unit 120, user's input
Unit 130, sensing unit 140, output unit 150, memory 160, interface unit 170, controller 180 and power supply unit 190
Etc..Fig. 1 shows the mobile terminal with various assemblies, it should be understood that being not required for implementing all groups shown
Part.More or fewer components can alternatively be implemented.The element of mobile terminal will be discussed in more detail below.
Wireless communication unit 110 generally includes one or more components, allows mobile terminal 100 and wireless communication system
Or the radio communication between network.For example, wireless communication unit may include broadcasting reception module 111, mobile communication module
112, at least one of wireless Internet module 113, short range communication module 114 and location information module 115.
Broadcasting reception module 111 receives broadcast singal and/or broadcast from external broadcast management server via broadcast channel
Relevant information.Broadcast channel may include satellite channel and/or terrestrial channel.Broadcast management server, which can be, to be generated and sent
The broadcast singal and/or broadcast related information generated before the server or reception of broadcast singal and/or broadcast related information
And send it to the server of terminal.Broadcast singal may include TV broadcast singal, radio signals, data broadcasting
Signal etc..Moreover, broadcast singal may further include the broadcast singal combined with TV or radio signals.Broadcast phase
Closing information can also provide via mobile communications network, and in this case, broadcast related information can be by mobile communication mould
Block 112 receives.Broadcast singal can exist in a variety of manners, for example, it can be with the electronics of digital multimedia broadcasting (DMB)
Program guide (EPG), digital video broadcast-handheld (DVB-H) electronic service guidebooks (ESG) etc. form and exist.Broadcast
Receiving module 111 can receive signal broadcast by using various types of broadcast systems.Particularly, broadcasting reception module 111
It can be wide by using such as multimedia broadcasting-ground (DMB-T), digital multimedia broadcasting-satellite (DMB-S), digital video
It broadcasts-holds (DVB-H), the Radio Data System of forward link media (MediaFLO), received terrestrial digital broadcasting integrated service
(ISDB-T) etc. digit broadcasting system receives digital broadcasting.Broadcasting reception module 111, which may be constructed such that, to be adapted to provide for extensively
Broadcast the various broadcast systems and above-mentioned digit broadcasting system of signal.Via the received broadcast singal of broadcasting reception module 111 and/
Or broadcast related information can store in memory 160 (or other types of storage medium).
Mobile communication module 112 sends radio signals to base station (for example, access point, node B etc.), exterior terminal
And at least one of server and/or receive from it radio signal.Such radio signal may include that voice is logical
Talk about signal, video calling signal or according to text and/or Multimedia Message transmission and/or received various types of data.
The Wi-Fi (Wireless Internet Access) of the support mobile terminal of wireless Internet module 113.The module can be internally or externally
It is couple to terminal.Wi-Fi (Wireless Internet Access) technology involved in the module may include WLAN (Wireless LAN) (Wi-Fi), Wibro
(WiMAX), Wimax (worldwide interoperability for microwave accesses), HSDPA (high-speed downlink packet access) etc..
Short range communication module 114 is the module for supporting short range communication.Some examples of short-range communication technology include indigo plant
Tooth TM, radio frequency identification (RFID), Infrared Data Association (IrDA), ultra wide band (UWB), purple honeybee TM etc..
Location information module 115 is the module for checking or obtaining the location information of mobile terminal.Location information module
Typical case be GPS (global positioning system).According to current technology, the calculating of location information module 115 is from three or more
The range information and correct time information of more satellites and Information application triangulation for calculating, thus according to warp
Degree, latitude and highly accurately calculate three-dimensional current location information.Currently, it is used for the method for calculating position and temporal information
Three satellites and the error that calculated position and temporal information are corrected by using an other satellite.In addition, position
Information module 115 can be by Continuous plus current location information in real time come calculating speed information.
A/V input unit 120 is for receiving audio or video signal.A/V input unit 120 may include 121 He of camera
Microphone 122, camera 121 is to the static images obtained in video acquisition mode or image capture mode by image capture apparatus
Or the image data of video is handled.Treated, and picture frame may be displayed on display unit 151.It is handled through camera 121
Picture frame afterwards can store in memory 160 (or other storage mediums) or be sent out via wireless communication unit 110
It send, two or more cameras 121 can be provided according to the construction of mobile terminal.Microphone 122 can telephone calling model,
Sound (audio data) is received via microphone 122 in logging mode, speech recognition mode etc. operational mode, and can be incited somebody to action
Such acoustic processing is audio data.Audio that treated (voice) data can be converted in the case where telephone calling model
For the format output that can be sent to mobile communication base station via mobile communication module 112.Various types can be implemented in microphone 122
Noise eliminate (or inhibit) algorithm with eliminate noise that (or inhibition) generates during sending and receiving audio signal or
Person's interference.
The order that user input unit 130 can be inputted according to user generates key input data to control each of mobile terminal
Kind operation.User input unit 130 allows user to input various types of information, and may include keyboard, metal dome, touch
Plate (for example, the sensitive component of detection due to the variation of resistance, pressure, capacitor etc. caused by being contacted), idler wheel, rocking bar etc.
Deng.Particularly, when touch tablet is superimposed upon in the form of layer on display unit 151, touch screen can be formed.
Sensing unit 140 detects the current state of mobile terminal 100, (for example, mobile terminal 100 opens or closes shape
State), the position of mobile terminal 100, user is for the presence or absence of contact (that is, touch input) of mobile terminal 100, mobile terminal
100 orientation, the acceleration or deceleration movement of mobile terminal 100 and direction etc., and generate for controlling mobile terminal 100
The order of operation or signal.For example, sensing unit 140 can sense when mobile terminal 100 is embodied as sliding-type mobile phone
The sliding-type phone is to open or close.In addition, sensing unit 140 be able to detect power supply unit 190 whether provide electric power or
Whether person's interface unit 170 couples with external device (ED).Sensing unit 140 may include proximity sensor 141.
Interface unit 170 is used as mobile terminal 100 and connect at least one external device (ED).For example, external device (ED) can wrap
Include wired or wireless headphone port, external power supply (or battery charger) port, wired or wireless data port, storage
Card port, port, the port audio input/output (I/O), video i/o port, ear for connecting the device with identification module
Generator terminal mouth etc..Identification module can be storage for verifying user using the various information of mobile terminal 100 and can wrap
Include subscriber identification module (UIM), client identification module (SIM), Universal Subscriber identification module (USIM) etc..Know in addition, having
The device (hereinafter referred to as " identification device ") of other module can take the form of smart card, and therefore, identification device can be via end
Mouth or other attachment devices are connect with mobile terminal 100.Interface unit 170 can be used for receiving the input from external device (ED)
(for example, data information, electric power etc.) and the input received is transferred to one or more elements in mobile terminal 100
Or it can be used for transmitting data between mobile terminal and external device (ED).In addition, when mobile terminal 100 is connect with external base
When, interface unit 170 may be used as allowing by its by electric power from pedestal provide to mobile terminal 100 path or can use
Make the various command signals for allowing to input from pedestal and passes through its path for being transferred to mobile terminal.The various orders inputted from pedestal
Signal or electric power may be used as whether mobile terminal for identification is accurately fitted within the signal on pedestal.
Output unit 150 is configured to provide output signal with vision, audio and/or tactile manner (for example, audio is believed
Number, vision signal, alarm signal, vibration signal etc.).Output unit 150 may include display unit 151, audio output mould
Block 152, alarm unit 153 etc..
Display unit 151 may be displayed on the information handled in mobile terminal 100.For example, when mobile terminal 100 is in electricity
When talking about call mode, display unit 151 can show and converse or other communicate (for example, text messaging, multimedia file
Downloading etc.) relevant user interface (UI) or graphic user interface (GUI).When mobile terminal 100 is in video calling mode
Or when image capture mode, display unit 151 can show captured image and/or received image, show video or figure
Picture and the UI or GUI of correlation function etc..
Meanwhile when display unit 151 and touch tablet in the form of layer it is superposed on one another to form touch screen when, display unit
151 may be used as input unit and output device.Display unit 151 may include liquid crystal display (LCD), thin film transistor (TFT)
In LCD (TFT-LCD), Organic Light Emitting Diode (OLED) display, flexible display, three-dimensional (3D) display etc. at least
It is a kind of.Some in these displays may be constructed such that transparence to allow user to watch from outside, this is properly termed as transparent
Display, typical transparent display can be, for example, TOLED (transparent organic light emitting diode) display etc..According to specific
Desired embodiment, mobile terminal 100 may include two or more display units (or other display devices), for example, moving
Dynamic terminal may include outernal display unit (not shown) and inner display unit (not shown).Touch screen can be used for detecting touch
Input pressure and touch input position and touch input area.
Audio output module 152 can mobile terminal be in call signal reception pattern, call mode, logging mode,
It is when under the isotypes such as speech recognition mode, broadcast reception mode, wireless communication unit 110 is received or in memory 160
The audio data transducing audio signal of middle storage and to export be sound.Moreover, audio output module 152 can provide and movement
The relevant audio output of specific function (for example, call signal receives sound, message sink sound etc.) that terminal 100 executes.
Audio output module 152 may include loudspeaker, buzzer etc..
Alarm unit 153 can provide output, and event is notified to mobile terminal 100.Typical event can
To include calling reception, message sink, key signals input, touch input etc..Other than audio or video output, alarm list
Member 153 can provide output in different ways with the generation of notification event.For example, alarm unit 153 can be with the shape of vibration
Formula provides output, when receiving calling, message or some other entrance communications (incoming communication), alarm
Unit 153 can provide tactile output (that is, vibration) to notify to user.By providing such tactile output, even if
When the mobile phone of user is in the pocket of user, user also can recognize that the generation of various events.Alarm unit 153
The output of the generation of notification event can also be provided via display unit 151 or audio output module 152.
Memory 160 can store the software program etc. of the processing and control operation that are executed by controller 180, Huo Zheke
Temporarily to store oneself data (for example, telephone directory, message, still image, video etc.) through exporting or will export.And
And memory 160 can store about the vibrations of various modes and audio signal exported when touching and being applied to touch screen
Data.
Memory 160 may include the storage medium of at least one type, and the storage medium includes flash memory, hard disk, more
Media card, card-type memory (for example, SD or DX memory etc.), random access storage device (RAM), static random-access storage
Device (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read only memory
(PROM), magnetic storage, disk, CD etc..Moreover, mobile terminal 100 can execute memory with by network connection
The network storage device of 160 store function cooperates.
The overall operation of the usually control mobile terminal of controller 180.For example, controller 180 executes and voice communication, data
Communication, video calling etc. relevant control and processing.In addition, controller 180 may include for reproducing (or playback) more matchmakers
The multi-media module 181 of volume data, multi-media module 181 can construct in controller 180, or can be structured as and control
Device 180 separates.Controller 180 can be with execution pattern identifying processing, by the handwriting input executed on the touchscreen or picture
It draws input and is identified as character or image.
Power supply unit 190 receives external power or internal power under the control of controller 180 and provides operation each member
Electric power appropriate needed for part and component.
Various embodiments described herein can be to use the calculating of such as computer software, hardware or any combination thereof
Machine readable medium is implemented.Hardware is implemented, embodiment described herein can be by using application-specific IC
(ASIC), digital signal processor (DSP), digital signal processing device (DSPD), programmable logic device (PLD), scene can
Programming gate array (FPGA), controller, microcontroller, microprocessor, is designed to execute function described herein processor
At least one of electronic unit is implemented, and in some cases, such embodiment can be implemented in controller 180.
For software implementation, the embodiment of such as process or function can with allow to execute the individual of at least one functions or operations
Software module is implemented.Software code can by the software application (or program) write with any programming language appropriate Lai
Implement, software code can store in memory 160 and be executed by controller 180.
So far, oneself is through describing mobile terminal according to its function.In the following, for the sake of brevity, will description such as folded form,
Slide type mobile terminal in various types of mobile terminals of board-type, oscillating-type, slide type mobile terminal etc., which is used as, to be shown
Example.Therefore, the present invention can be applied to any kind of mobile terminal, and be not limited to slide type mobile terminal.
Mobile terminal 100 as shown in Figure 1 may be constructed such that using via frame or grouping send data it is all if any
Line and wireless communication system and satellite-based communication system operate.
Referring now to Fig. 2 description communication system that wherein mobile terminal according to the present invention can operate.
Different air interface and/or physical layer can be used in such communication system.For example, used by communication system
Air interface includes such as frequency division multiple access (FDMA), time division multiple acess (TDMA), CDMA (CDMA) and universal mobile communications system
System (UMTS) (particularly, long term evolution (LTE)), global system for mobile communications (GSM) etc..As non-limiting example, under
The description in face is related to cdma communication system, but such introduction is equally applicable to other types of system.
With reference to Fig. 2, cdma wireless communication system may include multiple mobile terminals 100, multiple base stations (BS) 270, base station
Controller (BSC) 275 and mobile switching centre (MSC) 280.MSC280 is configured to and Public Switched Telephony Network (PSTN)
290 form interface.MSC280 is also structured to form interface with the BSC275 that can be couple to base station 270 via back haul link.
Back haul link can be constructed according to any in several known interfaces, and the interface includes such as E1/T1, ATM, IP,
PPP, frame relay, HDSL, ADSL or xDSL.It will be appreciated that system may include multiple BSC275 as shown in Figure 2.
Each BS270 can service one or more subregions (or region), by multidirectional antenna or the day of direction specific direction
Each subregion of line covering is radially far from BS270.Alternatively, each subregion can be by two or more for diversity reception
Antenna covering.Each BS270, which may be constructed such that, supports multiple frequency distribution, and the distribution of each frequency has specific frequency spectrum
(for example, 1.25MHz, 5MHz etc.).
What subregion and frequency were distributed, which intersects, can be referred to as CDMA Channel.BS270 can also be referred to as base station transceiver
System (BTS) or other equivalent terms.In this case, term " base station " can be used for broadly indicating single
BSC275 and at least one BS270.Base station can also be referred to as " cellular station ".Alternatively, each subregion of specific BS270 can be claimed
For multiple cellular stations.
As shown in Figure 2, broadcast singal is sent to the mobile terminal operated in system by broadcsting transmitter (BT) 295
100.Broadcasting reception module 111 as shown in Figure 1 is arranged at mobile terminal 100 to receive the broadcast sent by BT295
Signal.In fig. 2 it is shown that several global positioning system (GPS) satellites 300.The help of satellite 300 positions multiple mobile terminals
At least one of 100.
In Fig. 2, multiple satellites 300 are depicted, it is understood that, it is useful to can use any number of satellite acquisition
Location information.Location information module 115 as shown in Figure 1 is generally configured to cooperate with satellite 300 desired to obtain
Location information.It substitutes GPS tracking technique or except GPS tracking technique, the position that can track mobile terminal can be used
Other technologies.In addition, at least one 300 property of can choose of satellite or extraly processing satellite dmb transmission.
As a typical operation of wireless communication system, BS270 receives the reverse link from various mobile terminals 100
Signal.Mobile terminal 100 usually participates in call, information receiving and transmitting and other types of communication.Specific BS270 is received each reversed
Link signal is handled in specific BS270.The data of acquisition are forwarded to relevant BSC275.BSC275 provides call money
The mobile management function of source distribution and the coordination including the soft switching process between BS270.The data that BSC275 will also be received
It is routed to MSC280, the additional route service for forming interface with PSTN290 is provided.Similarly, PSTN290 with
MSC280 forms interface, and MSC280 and BSC275 form interface, and BSC275 controls BS270 correspondingly to believe forward link
Number it is sent to mobile terminal 100.
Based on above-mentioned mobile terminal hardware configuration and communication system, each embodiment of the invention is proposed.
It is a kind of mobile terminal loudspeaker impedance measuring circuit provided by one embodiment of the present invention referring to Fig. 3, Fig. 3, uses
It being measured in the impedance to the loudspeaker in mobile terminal, the mobile terminal also has external interface, including：Isolated from power
Circuit, power amplifier isolation circuit and measuring circuit；
The control terminal of the control terminal of power isolation circuit, the control terminal of power amplifier isolation circuit and measuring circuit is distinguished
It is connect with the control terminal of external interface；
The isolation terminal of power isolation circuit is connect with mobile terminal power supply line and mobile terminal power management chip respectively；
The isolation terminal of power amplifier isolation circuit is connect with mobile terminal power amplifier and mobile terminal loudspeaker respectively；
The measurement terminal of measuring circuit is connect with the measurement terminal of external interface and mobile terminal loudspeaker respectively；
The external interface of the mobile terminal is Type-c interface.
The power isolation circuit includes first switch tube, and the first switch tube is PMOS switch pipe P3, the switch
The grid of pipe P3 is connect with the end VBUS of mobile terminal Type-c interface, and source electrode is connect with mobile terminal power supply, drain electrode and movement
The connection of terminal supplying power managing chip.
The power amplifier isolation circuit includes second switch and third switching tube, the second switch and third switching tube
It is PMOS switch pipe P1 and P2, the power amplifier isolation circuit of the mobile terminal loudspeaker impedance measuring circuit includes that two PMOS are opened
Close pipe P1 and P2；The grid of the switching tube P1 is connect with the end VBUS of mobile terminal Type-c interface, source electrode and mobile terminal
Power amplifier connection, the anode connection of drain electrode mobile terminal loudspeaker；The grid and mobile terminal Type-c interface of the switching tube P2
The connection of the end VBUS, source electrode connect with mobile terminal power amplifier, and the cathode for the mobile terminal loudspeaker that drains connects.
The measuring circuit includes the 4th switching tube and the 5th switching tube, and the 4th switching tube and the 5th switching tube are
NMOS switch pipe N1 and N2, the grid of the switching tube N1 are connect with the end VBUS of mobile terminal Type-c interface, source electrode and shifting
The end the D+ connection of dynamic terminal Type-c interface, drain electrode are connect with mobile terminal loudspeaker anode；
The grid of the switching tube N2 is connect with the end VBUS of mobile terminal Type-c interface, source electrode and mobile terminal
The end D- of Type-c interface connects, and drain electrode is connect with mobile terminal loudspeaker cathode.
When measuring the impedance of the loudspeaker of mobile terminal by the loudspeaker impedance measuring circuit, mobile terminal is given
The control signal is sent to by the end VBUS of the end the VBUS input control signal of Type-c interface, mobile terminal Type-c interface
The grid of switching tube P1, P2, P3, N1 and N2, P3 pipe, which is closed, disconnects mobile terminal power supply and mobile terminal power management chip
Connection, to cut off power supply of the mobile terminal power supply to Mobile terminal main board, i.e., mobile terminal loudspeaker powers off, and P1, P2 pipe close
It closes, the connection of mobile terminal power amplifier and mobile terminal loudspeaker is isolated, mobile terminal power amplifier is avoided to make mobile terminal loudspeaker
At interference, N1, N2 pipe are opened, and D+, D- of mobile terminal Type-c interface and the both ends of mobile terminal loudspeaker connect, in outside
Just using the TEST 1 (D+) of multimeter (or other measurement impedance devices) test Type-c interface, two terminal impedance of TEST2 (D-)
Obtain the impedance of mobile terminal loudspeaker.
The mobile terminal loudspeaker impedance measuring circuit that the present embodiment proposes passes through setting when measuring loudspeaker impedance
Power isolation circuit has separated the connection of mobile terminal power supply Yu Mobile terminal main board internal circuit, setting power amplifier isolation circuit every
Connection from mobile terminal power amplifier and loudspeaker avoids power amplifier to interference caused by loudspeaker impedance measurement, and passes through
Measuring circuit connects the external interface of loudspeaker and mobile terminal, so that only needing when measuring loudspeaker impedance without tearing machine open
It is measured in external interface, it is easy to operate, the human cost and Material Cost of after-sales service are reduced, the machine of tearing open is avoided and makes
At speaker damage risk.
A kind of mobile terminal speaker circuit is provided for the embodiment of the present invention referring to Fig. 4, Fig. 4, including：The mobile end
Hold loudspeaker impedance measuring circuit, power amplifier and loudspeaker.
The grid of the switching tube P3 is connect with the end VBUS of mobile terminal Type-c interface, source electrode and battery of mobile terminal
Connection, drain electrode are connect with mobile terminal power management chip；
The grid of the switching tube P1 is connect with the end VBUS of mobile terminal Type-c interface, and source electrode is connect with power amplifier, leakage
The anode of pole and loudspeaker connects；The grid of the switching tube P2 is connect with the end VBUS of mobile terminal Type-c interface, source electrode with
Power amplifier connection, drain electrode are connect with the cathode of loudspeaker.
The measuring circuit includes two NMOS switch pipes N1 and N2, the grid and mobile terminal of the switching tube N1
The end VBUS of Type-c interface connects, and source electrode is connect with the end D+ of mobile terminal Type-c interface, and drain electrode is connect with loudspeaker anode；
The grid of the switching tube N2 is connect with the end VBUS of mobile terminal Type-c interface, source electrode and mobile terminal
The end D- of Type-c interface connects, and drain electrode is connect with loudspeaker cathode.
Mobile terminal speaker circuit shown in Fig. 4 further includes that LC filter circuit is arranged between loudspeaker and power amplifier；In figure
VSENSE+ and VSENSE- be feedback signal, effect is acquisition Current Voltage and parametric loudspeaker and power amplifier inner setting parameter
It is compared, to determine whether loudspeaker work is normal, can report an error if exception.
The impedance for measuring loudspeaker in mobile terminal speaker circuit shown in Fig. 4 includes：
For the end the VBUS input high level (such as 1.8V) of Type-c interface shown in Fig. 4, P3 pipe, which is closed, disconnects battery and electricity
The connection of source control chip, to cut off power supply of the battery to Mobile terminal main board, P1, P2 pipe are closed, and power amplifier and loudspeaker are isolated
Connection, avoid power amplifier from interfering loudspeaker, N1, N2 pipe are opened, and the both ends of D+, D- of Type-c interface and loudspeaker connect,
In the external TEST 1 (D+) using multimeter (or other measurement impedance devices) test Type-c interface, the both ends TEST 2 (D-)
Impedance just obtains the impedance of loudspeaker.
When the end the VBUS input low level of Type-c interface when (such as 0V), P1, P2, P3 pipe are opened, and battery supplies mainboard
Electricity, N1, N2 pipe are closed, and D+, D- of Type-c interface and loudspeaker both ends disconnect, and loudspeaker work normally.
The mobile terminal speaker circuit that the present embodiment proposes leads to when measuring the loudspeaker impedance in speaker circuit
The power isolation circuit for crossing the setting of loudspeaker impedance measuring circuit has separated electricity inside mobile terminal power supply and Mobile terminal main board
Mobile terminal power amplifier and loudspeaker has been isolated in the connection on road, the power amplifier isolation circuit being arranged by loudspeaker impedance measuring circuit
Connection avoids power amplifier to interference caused by loudspeaker impedance measurement, and passes through the measurement in loudspeaker impedance measuring circuit
Circuit connects the external interface of loudspeaker and mobile terminal, so that only needing outside when measuring loudspeaker impedance without tearing machine open
The measurement of portion's interface, it is easy to operate, the human cost and Material Cost of after-sales service are reduced, caused by avoiding the machine of tearing open
Speaker damage risk.
The embodiment of the present invention provides a kind of mobile terminal, may include the mobile terminal speaker circuit, external connects
Mouth, power supply and power management chip；
The grid of the switching tube P3 is connect with the end VBUS of Type-c interface, and source electrode connects to power supply, drain electrode and power supply
Managing chip connection；
The power amplifier isolation circuit of the mobile terminal loudspeaker impedance measuring circuit includes two PMOS switch pipes P1 and P2；
The grid of the switching tube P1 is connect with the end VBUS of Type-c interface, and source electrode is connect with power amplifier, the anode of drain electrode and loudspeaker
Connection；The grid of the switching tube P2 is connect with the end VBUS of Type-c interface, and source electrode is connect with power amplifier, drain electrode and loudspeaker
Cathode connection.
The grid of the switching tube P4 is connect with the end VBUS of mobile terminal Type-c interface, source electrode and mobile terminal
The end D+ of Type-c interface connects, and drain electrode is connect with mobile terminal loudspeaker anode；
The grid of the switching tube P5 is connect with the end VBUS of mobile terminal Type-c interface, source electrode and mobile terminal
The end D- of Type-c interface connects, and drain electrode is connect with mobile terminal loudspeaker cathode.
When measuring loudspeaker impedance in the mobile terminal, one can be looked for contain Type-c plug and Micro-b interface
Data line；
By the Type-c interface of the Type-c plug insertion mobile terminal of data line；
To Micro-b interface power signal line (VBUS) input 1.8V high level, with multimeter (or other measurement impedances
Equipment) test Micro-b interface the both ends D+, D- impedance, measure come impedance value be loudspeaker impedance.
The mobile terminal that the present embodiment proposes is hindered when measuring the impedance of the loudspeaker in mobile terminal by loudspeaker
The power isolation circuit of anti-measuring circuit setting has separated the connection of mobile terminal power supply Yu Mobile terminal main board internal circuit, leads to
The connection of mobile terminal power amplifier and loudspeaker has been isolated in the power amplifier isolation circuit for crossing the setting of loudspeaker impedance measuring circuit, avoids
Power amplifier interferes caused by measuring loudspeaker impedance, and makes loudspeaker by the measuring circuit in loudspeaker impedance measuring circuit
It is connect with the external interface of mobile terminal, so that need to only be measured in external interface when measuring loudspeaker impedance without tearing machine open
, it is easy to operate, the human cost and Material Cost of after-sales service are reduced, speaker damage wind caused by the machine of tearing open is avoided
Danger.
The embodiment of the present invention also provides a kind of equipment for measuring loudspeaker impedance in the mobile terminal, including：
Power supply, for the voltage end input control electric signal to Type-C interface；
Impedance measurement device, the impedance electric signal of the loudspeaker module for measuring Type-C interface data end, is raised
The impedance of sound device module.
Fig. 5 is the structural schematic diagram for the mobile terminal that another embodiment of the present invention provides.Mobile terminal shown in Fig. 4
400 include：At least one processor 401, memory 402, at least one network interface 404 and other users interface 403.It is mobile
Various components in terminal 400 are coupled by bus system 405.It is understood that bus system 405 is for realizing these groups
Connection communication between part.Bus system 405 further includes power bus, control bus and state in addition to including data/address bus
Signal bus.But for the sake of clear explanation, various buses are all designated as bus system 405 in Fig. 4.
Wherein, user interface 403 may include display, keyboard or pointing device (for example, mouse, trace ball
(trackball), touch-sensitive plate or touch screen etc..
It is appreciated that the memory 402 in the embodiment of the present invention can be volatile memory or nonvolatile memory,
It or may include both volatile and non-volatile memories.Wherein, nonvolatile memory can be read-only memory (Read-
OnlyMemory, ROM), programmable read only memory (Programmable ROM, PROM), the read-only storage of erasable programmable
Device (Erasable PROM, EPROM), electrically erasable programmable read-only memory (Electrically EPROM, EEPROM) or
Flash memory.Volatile memory can be random access memory (Random Access Memory, RAM), be used as external high
Speed caching.By exemplary but be not restricted explanation, the RAM of many forms is available, such as static random access memory
(Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), Synchronous Dynamic Random Access Memory
(Synchronous DRAM, SDRAM), double data speed synchronous dynamic RAM (Double DataRate
SDRAM, DDRSDRAM), enhanced Synchronous Dynamic Random Access Memory (Enhanced SDRAM, ESDRAM), synchronized links
Dynamic random access memory (Synch link DRAM, SLDRAM) and direct rambus random access memory (Direct
Rambus RAM, DRRAM).Memory 402 described herein is intended to include but is not limited to these and any other suitable type
Memory.
In some embodiments, memory 402 stores following element, and unit or data structure can be performed, or
Their subset of person or their superset：Operating system 4021 and application program 4022.
Wherein, operating system 4021 include various system programs, such as ccf layer, core library layer, driving layer etc., are used for
Realize various basic businesses and the hardware based task of processing.Application program 4022 includes various application programs, such as media
Player (Media Player), browser (Browser) etc., for realizing various applied business.
In embodiments of the present invention, by the program or instruction of calling memory 402 to store, specifically, can be application
The program or instruction stored in program 4022, processor 401 are used to execute described program or instruction, for example including：To Type-C
The voltage end input control electric signal of interface；
The impedance electric signal for measuring the loudspeaker module at Type-C interface data end, obtains the impedance of loudspeaker module.
Above-mentioned processor 401 can be general processor, digital signal processor (Digital Signal
Processor, DSP), it is specific integrated circuit (Application Specific Integrated Circuit, ASIC), existing
At programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic device, discrete
Door or transistor logic, discrete hardware components.General processor can be microprocessor or the processor can also be with
It is any conventional processor etc..Software unit can be located at random access memory, and flash memory, read-only memory may be programmed read-only deposit
In the storage medium of this fields such as reservoir or electrically erasable programmable memory, register maturation.The storage medium, which is located at, to be deposited
Reservoir 402, processor 401 read the information in memory 402.
It is understood that embodiments described herein can with hardware, software, firmware, middleware, microcode or its
Combination is to realize.For hardware realization, processing unit be may be implemented in one or more specific integrated circuit (Application
Specific Integrated Circuits, ASIC), digital signal processor (Digital Signal Processing,
DSP), digital signal processing appts (DSP Device, DSPD), programmable logic device (Programmable Logic
Device, PLD), field programmable gate array (Field-Programmable Gate Array, FPGA), general processor,
In controller, microcontroller, microprocessor, other electronic units for executing herein described function or combinations thereof.
For software implementations, the techniques described herein can be realized by executing the unit of function described herein.Software generation
Code is storable in memory and is executed by processor.Memory can in the processor or portion realizes outside the processor.
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
The scope of the present invention.
In embodiment provided herein, it should be understood that disclosed device, it can be real by another way
It is existing.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only one kind are patrolled
Volume function division, there may be another division manner in actual implementation, such as multiple units or components can combine or can be with
It is integrated into another system, or some features can be ignored or not executed.Another point, it is shown or discussed mutual
Coupling, direct-coupling or communication connection can be through some interfaces, the indirect coupling or communication connection of device or unit, can
To be electrically mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer readable storage medium.Based on this understanding, the technical solution of the embodiment of the present invention is substantially
The part of the part that contributes to existing technology or the technical solution can embody in the form of software products in other words
Come, which is stored in a storage medium, including some instructions are used so that a computer equipment (can
To be personal computer, server or the network equipment etc.).And storage medium above-mentioned includes：USB flash disk, mobile hard disk, ROM,
The various media that can store program code such as RAM, magnetic or disk.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the device that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or device institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or device.
It should be noted that, in this document, the relational terms of such as " first " and " second " or the like are used merely to one
A entity or operation with another entity or operate distinguish, without necessarily requiring or implying these entities or operation it
Between there are any actual relationship or orders.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of mobile terminal loudspeaker impedance measuring circuit, measures for the impedance to the loudspeaker in mobile terminal,
The mobile terminal also has external interface, which is characterized in that including：Power isolation circuit, power amplifier isolation circuit and measurement electricity
Road；
The control terminal of the control terminal of power isolation circuit, the control terminal of power amplifier isolation circuit and measuring circuit is respectively and outside
The control terminal of connection interface connects；
The isolation terminal of power isolation circuit is connect with mobile terminal power supply line and mobile terminal power management chip respectively；
The isolation terminal of power amplifier isolation circuit is connect with mobile terminal power amplifier and mobile terminal loudspeaker respectively；
The measurement terminal of measuring circuit is connect with the measurement terminal of external interface and mobile terminal loudspeaker respectively；
The control terminal of power isolation circuit receives the control signal that the control terminal of external interface issues, power isolation circuit
The connection of isolation terminal disconnection mobile terminal power supply line and mobile terminal power management chip；
The control terminal of power amplifier isolation circuit receives the control signal that the control terminal of external interface issues, power amplifier isolation circuit
The connection of isolation terminal disconnection mobile terminal power amplifier and mobile terminal loudspeaker；
The control terminal of measuring circuit receives the control signal that the control terminal of external interface issues, the measurement terminal of measuring circuit
Connect the measurement terminal of external interface and the connection of mobile terminal loudspeaker.
2. mobile terminal loudspeaker impedance measuring circuit as described in claim 1, which is characterized in that the power isolation circuit
Including first switch tube；
The grid of the first switch tube is connected by the control terminal of the power isolation circuit and the control terminal of external interface
It connects；
The source electrode of the first switch tube is connected by the first isolation terminal and mobile terminal power supply line of the power isolation circuit
It connects；
The second isolation terminal and mobile terminal power management that the drain electrode of the first switch tube passes through the power isolation circuit
Chip connection.
3. mobile terminal loudspeaker impedance measuring circuit as described in claim 1, which is characterized in that the power amplifier isolation circuit
Including second switch and third switching tube；
The grid of the second switch and the grid of third switching tube are connect by the control terminal of power amplifier isolation circuit with external
The control terminal connection of mouth；
The source electrode of the second switch is connect by the first isolation terminal of the power amplifier isolation circuit with mobile terminal power amplifier；
The second isolation terminal and mobile terminal loudspeaker that the drain electrode of the second switch passes through the power amplifier isolation circuit
Anode connection；
The source electrode of the third switching tube is connect by the third isolation terminal of the power amplifier isolation circuit with mobile terminal power amplifier；
The 4th isolation terminal and mobile terminal loudspeaker that the drain electrode of the third switching tube passes through the power amplifier isolation circuit
Cathode connection.
4. mobile terminal loudspeaker impedance measuring circuit as claimed in claim 2, which is characterized in that the first switch tube is
PMOS switch pipe.
5. mobile terminal loudspeaker impedance measuring circuit as claimed in claim 3, which is characterized in that the second switch and
Third switching tube is PMOS switch pipe.
6. mobile terminal loudspeaker impedance measuring circuit as described in claim 1, which is characterized in that the measuring circuit includes
4th switching tube and the 5th switching tube；
The grid of the grid of 4th switching tube and the 5th switching tube passes through the control terminal of measuring circuit and external interface
Control terminal connection；
The source electrode of 4th switching tube is connected by the first measurement terminal of measuring circuit and the first measurement terminal of external interface
It connects；
The drain electrode of 4th switching tube is connect by the third measurement terminal of measuring circuit with mobile terminal loudspeaker anode；
5th source electrode to open the light is connected by the second measurement terminal of measuring circuit and the second measurement terminal of external interface；
The drain electrode of 5th switching tube is connect by the 4th measurement terminal of measuring circuit with mobile terminal loudspeaker cathode.
7. mobile terminal loudspeaker impedance measuring circuit as claimed in claim 6, which is characterized in that the 4th switching tube and
5th switching tube is NMOS switch pipe.
8. a kind of mobile terminal speaker circuit, which is characterized in that including：Mobile terminal as claimed in claim 1 to 7 is raised
Sound device impedance measuring circuit, power amplifier and loudspeaker.
9. a kind of mobile terminal, which is characterized in that including mobile terminal speaker circuit according to any one of claims 8, external interface,
Power supply and power management chip；
The power supply passes sequentially through power management chip and power amplifier is connect with loudspeaker.
10. mobile terminal as claimed in claim 9, which is characterized in that the external interface is Type-c interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810706005.4A CN108828315B (en) | 2018-06-26 | 2018-06-26 | Mobile terminal loudspeaker impedance measuring circuit, loudspeaker circuit and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810706005.4A CN108828315B (en) | 2018-06-26 | 2018-06-26 | Mobile terminal loudspeaker impedance measuring circuit, loudspeaker circuit and mobile terminal |
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| Publication Number | Publication Date |
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| CN108828315A true CN108828315A (en) | 2018-11-16 |
| CN108828315B CN108828315B (en) | 2020-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810706005.4A Active CN108828315B (en) | 2018-06-26 | 2018-06-26 | Mobile terminal loudspeaker impedance measuring circuit, loudspeaker circuit and mobile terminal |
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| CN110120662A (en) * | 2019-04-28 | 2019-08-13 | 努比亚技术有限公司 | Circuit protection circuit |
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| Publication number | Publication date |
|---|---|
| CN108828315B (en) | 2020-12-08 |
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