CN108289270B

CN108289270B - Loudspeaker and mobile terminal

Info

Publication number: CN108289270B
Application number: CN201810118389.8A
Authority: CN
Inventors: 邹瑜忠
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2018-02-06
Filing date: 2018-02-06
Publication date: 2021-01-08
Anticipated expiration: 2038-02-06
Also published as: CN108289270A

Abstract

The embodiment of the invention provides a loudspeaker and a mobile terminal. The speaker includes: the device comprises a shell, a vibrating diaphragm and a folding ring; wherein, the inner side of the corrugated rim is provided with a strain component which is a component made of metal material or semiconductor material with strain effect; the strain assembly is electrically connected with a power amplifier chip, the power amplifier chip is a part of the loudspeaker, or the power amplifier chip is an assembly electrically connected with the loudspeaker. According to the embodiment of the invention, the amplitude of the loudspeaker can be determined by the power amplifier chip according to the strain component arranged on the inner side of the loudspeaker, so that the detection accuracy of the amplitude of the loudspeaker is improved.

Description

Loudspeaker and mobile terminal

Technical Field

The embodiment of the invention relates to the technical field of communication, in particular to a loudspeaker and a mobile terminal.

Background

A speaker is a device capable of converting an electrical signal into an acoustic signal. When the loudspeaker is in a working state with overlarge amplitude for a long time, the performance of the loudspeaker is affected, and then the sound effect is affected, so that the amplitude of the loudspeaker needs to be detected, and the amplitude of the loudspeaker needs to be controlled within a certain range.

In the prior art, a power amplifier chip pre-estimates the amplitude of a loudspeaker through an amplitude protection algorithm, and adjusts the signal intensity of a signal source of the loudspeaker according to the estimated value, so that the amplitude of the loudspeaker is controlled within an amplitude protection range.

However, errors exist in the modeling and estimation working stages of the current amplitude protection algorithm, so that the power amplifier chip cannot accurately detect the amplitude of the loudspeaker.

Disclosure of Invention

The embodiment of the invention provides a loudspeaker and a mobile terminal, and aims to solve the problem that a power amplifier chip in the prior art cannot accurately detect the amplitude of the loudspeaker.

In order to solve the above technical problem, in a first aspect, an embodiment of the present invention provides a speaker, including:

the device comprises a shell, a vibrating diaphragm and a folding ring; wherein, the inner side of the corrugated rim is provided with a strain component which is a component made of metal material or semiconductor material with strain effect; the strain assembly is electrically connected with a power amplifier chip, the power amplifier chip is a part of the loudspeaker, or the power amplifier chip is an assembly electrically connected with the loudspeaker.

In a second aspect, an embodiment of the present invention provides a mobile terminal, including the speaker.

In the embodiment of the invention, the strain component is arranged on the inner side of the corrugated rim of the loudspeaker, and the power amplifier chip is electrically connected with the strain component to determine the amplitude of the loudspeaker, so that the detection accuracy of the amplitude of the loudspeaker can be improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a speaker according to an embodiment of the present invention.

Fig. 2 is a circuit diagram of an amplitude detection circuit of a speaker according to an embodiment of the present invention.

Fig. 3 is a circuit diagram of an amplitude detection circuit of another speaker according to the embodiment of the present invention.

Fig. 4 is a schematic hardware structure diagram of a mobile terminal implementing various embodiments of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a schematic structural diagram of a speaker disclosed in an embodiment of the present invention, where the speaker 100 includes:

the amplifier comprises a shell 101, a diaphragm 102 and a corrugated rim 103, wherein a strain component 104 is arranged inside the corrugated rim 103, and the strain component 104 is electrically connected with a power amplifier chip (not shown in the figure).

Further, the speaker 100 further includes a voice coil 105, a magnetic plate 106 and a magnetic steel 107, wherein the voice coil 105 is disposed in a gap between the magnetic plate 106 and the housing 101, the magnetic plate 106 is disposed on the magnetic steel 107, and the voice coil 105, the magnetic plate 106 and the magnetic steel 107 are disposed in the housing 101.

Here, the strain element 104 is an element made of a metal material having a strain effect or a semiconductor material having a piezoresistive effect. The strain effect is a phenomenon that the resistance value of a metal conductor changes along with the size of mechanical deformation generated by stress. The piezoresistive effect is a phenomenon that when a semiconductor is stressed, the resistivity of the semiconductor is changed due to the change of the carrier mobility.

In the embodiment of the invention, the strain component 104 is arranged on the inner side of the corrugated rim 103 of the loudspeaker 100, and the power amplifier chip determines the amplitude of the loudspeaker 100 according to the strain component 104, so that the detection accuracy of the amplitude of the loudspeaker 100 can be improved.

Further, the sensitivity coefficient of the metal material, which is the poisson's ratio of the metal material, is a fixed value in the case that the metal material is determined, and when the metal is strained, the metal is small and negligible, so that it can be known that the resistance change rate of the metal is in a linear relationship with the strain.

On the other hand, in the case where the semiconductor material is subjected to an axial force, the rate of change of resistance of the semiconductor material is, and is, much greater than, and therefore, greater than. Under the condition that the semiconductor material is determined, the sensitivity coefficient of the semiconductor material is a fixed value, so that the resistance change rate of the semiconductor material has a linear relation with the strain.

Further, when the diaphragm 102 is driven by an electrical signal to vibrate outwards, the edge 103 is subjected to a tensile force, and the resistance value of the strain element 104 arranged inside the edge 103 is increased; when the diaphragm 102 is driven by an electrical signal to vibrate inward, the edge 103 is subjected to a pressing force, and the resistance of the strain element 104 disposed inside the edge 103 is reduced.

It should be understood that the strain assembly 104 may be disposed a full turn inside the crimp 103 or may be disposed inside a portion of the crimp 103. Here, the material and the setting range of the strain component both affect the detection accuracy of the amplitude of the speaker, for example, when the material of the strain component is fixed, the larger the setting range of the strain component inside the corrugated rim is, the larger the resistance value change generated when the diaphragm vibrates is, and further, the higher the sensitivity of the power amplifier chip for detecting the amplitude of the speaker is.

In the embodiment of the invention, the strain component is arranged on the inner side of the corrugated rim of the loudspeaker, the power amplifier chip is electrically connected with the strain component to determine the amplitude of the loudspeaker, and the sensitivity of amplitude detection can be improved by changing the arrangement range of the strain component, so that the performance of the loudspeaker is further improved.

Correspondingly, because the strain component 104 is electrically connected with the power amplifier chip, the power amplifier chip can detect the resistance value change of the strain component 104 and determine the amplitude of the diaphragm according to the resistance value change. The power amplifier chip may be a part of the speaker 100, or may be a component electrically connected to the speaker 100, for example, the power amplifier chip may be a part of a mobile terminal, and the amplitude of the diaphragm 102 is detected by connecting the speaker 100.

Specifically, as shown in fig. 2, the strain element 201 is connected in parallel with the power amplifier chip 203, a first node point 205 of the strain element 201 and the power amplifier chip 203, and a second node point is electrically connected to the constant voltage source 204 through the first preset resistor unit 202. Here, the first pre-set resistance unit 202 may be a unit composed of one or more resistors and having a constant resistance value. The power amplifier chip 203 is connected in parallel with the strain component 201, and is used for acquiring a voltage division value at two ends of the strain component 201.

It should be understood that in another implementation manner of the present invention, the strain element 201 is connected in parallel with the power amplifier chip 203, a first node of the strain element 201 and the power amplifier chip 203 is electrically connected to the constant voltage source 204, and a second node is connected to the ground potential 205 through the first predetermined resistor unit 202.

In the embodiment of the present invention, the functional chip 203 detects the voltage value at both ends of the strain component 201, and determines the amplitude of the diaphragm according to the voltage value. Here, the functional chip 203 calculates the resistance of the strain element 201 according to the voltage value at the two ends of the strain element 201, the constant voltage provided by the constant voltage source 204, and the resistance of the first predetermined resistor unit 202, and determines the amplitude of the diaphragm based on the difference between the resistance of the strain element 201 and the initial resistance of the strain element. It should be understood that the initial resistance of the strain element is the resistance of the speaker in the unvoiced state, i.e., the resistance of the strain element before the change of the resistance is not performed.

Specifically, because the loudspeaker is in a working state, that is, when the loudspeaker produces sound, the diaphragm is driven by an electric signal to vibrate outwards or inwards, so that the edge ring is acted by a tensile force or a squeezing force, and then the resistance value of the strain component arranged on the inner side of the edge ring is changed, a mathematical relation between the change of the resistance value of the strain component and the diaphragm of the loudspeaker can be established, and based on the mathematical relation, the amplitude of the diaphragm is determined according to the difference value between the resistance value of the strain component 201 and the initial resistance value of the strain component.

In the embodiment of the invention, the strain component is arranged on the inner side of the corrugated rim of the loudspeaker, and the power amplifier chip determines the amplitude of the loudspeaker according to the resistance value change of the strain component, so that the detection error of the power amplifier chip can be reduced, and the accuracy is improved.

In the embodiment of the present invention, the power amplifier chip 203 adjusts the signal strength of the signal source of the speaker based on the amplitude of the diaphragm.

It should be understood that the functional chip 203 may preset an amplitude threshold value, since too large amplitude of the speaker for a long time may have an impact on the performance of the speaker. The power amplifier chip 203 may determine the amplitude of the diaphragm and determine whether the amplitude is greater than a preset threshold. And if the amplitude of the loudspeaker is larger than the preset threshold value, weakening the signal of the signal source so as to reduce the amplitude of the loudspeaker, and otherwise, amplifying the signal of the signal source so as to increase the amplitude of the loudspeaker.

In the embodiment of the invention, the strain component is arranged on the inner side of the corrugated rim of the loudspeaker, the power amplifier chip determines the amplitude of the loudspeaker according to the resistance value change of the strain component, and the signal intensity of the signal source of the loudspeaker is adjusted based on the amplitude of the loudspeaker, so that the performance of the loudspeaker is improved, and the service life of the loudspeaker is prolonged.

It should be understood that, as shown in fig. 3, the power amplifier chip 303 may be connected in parallel with the second predetermined resistor unit 302, and the power amplifier chip 303 is electrically connected to the ground potential 305 at a first node of the second predetermined resistor unit 302 and a second node is electrically connected to the constant voltage source 304 through the strain element 301. Here, the second pre-set resistance unit 302 may be a unit in which a resistance value of one or more resistors is constant. In the embodiment of the present invention, the power amplifier chip 303 calculates the voltage value at the two ends of the strain component 301 through the voltage value at the two ends of the second preset resistor unit 302, so as to determine the amplitude of the vibrating diaphragm.

It should be further understood that in another implementation manner of the present invention, the power amplifier chip 303 is connected in parallel with the second preset resistor unit 302, a first node of the power amplifier chip 303 and the second preset resistor unit 302 is electrically connected to the constant voltage source 304, and a second node is connected to the ground potential 305 through the strain element 301.

The embodiment of the invention also relates to a mobile terminal which comprises the loudspeaker. Here, the power amplifier chip may be a part of the speaker, the power amplifier chip disposed in the speaker calculates a resistance value of the strain component according to a voltage value at two ends of the strain component, a constant voltage provided by the constant voltage source, and a resistance value of the preset resistance unit, determines an amplitude of the diaphragm based on a difference between the resistance value of the strain component and an initial resistance value of the strain component, and adjusts a signal intensity of a signal source of the speaker according to the amplitude of the diaphragm to achieve a function of improving a performance of the speaker.

It should be understood that the power amplifier chip may also be a component electrically connected to the speaker, and the component is located in the mobile terminal. The power amplifier chip in the mobile terminal calculates the amplitude of the loudspeaker by detecting the voltage values at two ends of the strain assembly in the loudspeaker, and adjusts the signal intensity of a signal source of the loudspeaker based on the amplitude, so as to drive the loudspeaker to work with the maximum amplitude in the amplitude protection range.

It should be noted that, the implementation manner of the speaker embodiment is also applicable to the embodiment of the mobile terminal, and can achieve the same technical effect, and for avoiding repetition, the details are not described here again. In the embodiment of the invention, the strain component is arranged on the inner side of the corrugated rim of the loudspeaker, and the power amplifier chip determines the amplitude of the loudspeaker according to the strain component, so that the detection accuracy of the amplitude of the loudspeaker can be improved.

Fig. 4 is a schematic diagram of a hardware structure of a mobile terminal implementing various embodiments of the present invention.

The mobile terminal 400 includes, but is not limited to: radio frequency unit 401, network module 402, audio output unit 403, input unit 404, sensor 405, display unit 406, user input unit 407, interface unit 408, memory 409, processor 410, and power supply 411. Those skilled in the art will appreciate that the mobile terminal architecture shown in fig. 4 is not intended to be limiting of mobile terminals, and that a mobile terminal may include more or fewer components than shown, or some components may be combined, or a different arrangement of components. In the embodiment of the present invention, the mobile terminal includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.

It should be understood that, in the embodiment of the present invention, the radio frequency unit 401 may be used for receiving and sending signals during a message sending and receiving process or a call process, and specifically, receives downlink data from a base station and then processes the received downlink data to the processor 410; in addition, the uplink data is transmitted to the base station. Typically, radio unit 401 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. Further, the radio unit 401 can also communicate with a network and other devices through a wireless communication system.

The mobile terminal provides the user with wireless broadband internet access through the network module 402, such as helping the user send and receive e-mails, browse web pages, and access streaming media.

The audio output unit 403 may convert audio data received by the radio frequency unit 401 or the network module 402 or stored in the memory 409 into an audio signal and output as sound. Also, the audio output unit 403 may also provide audio output related to a specific function performed by the mobile terminal 400 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 403 includes a speaker, a buzzer, a receiver, and the like.

It should be understood that the audio output unit 403 includes the speaker described in the above embodiments, and as shown in fig. 1, the speaker includes the housing 101, the diaphragm 102, and the edge 103, and further includes the voice coil 105, the magnetic plate 106, and the magnetic steel 107. Wherein, the inner side of the corrugated rim 103 is provided with a strain component 104, and the strain component 104 is electrically connected with a power amplifier chip (not shown in the figure). The voice coil 105 is disposed in a gap between the magnetic plate 106 and the case 101, and the magnetic plate 106 is disposed on the magnetic steel 107. The voice coil 105, the magnetic plate 106 and the magnetic steel 107 are all disposed in the casing 101.

In the embodiment of the invention, the strain component is arranged on the inner side of the corrugated rim of the loudspeaker, and the power amplifier chip determines the amplitude of the loudspeaker according to the strain component, so that the detection accuracy of the amplitude of the loudspeaker can be improved.

The input unit 404 is used to receive audio or video signals. The input Unit 404 may include a Graphics Processing Unit (GPU) 4041 and a microphone 4042, and the Graphics processor 4041 processes image data of a still picture or video obtained by an image capturing apparatus (such as a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 406. The image frames processed by the graphic processor 4041 may be stored in the memory 409 (or other storage medium) or transmitted via the radio frequency unit 401 or the network module 402. The microphone 4042 may receive sound, and may be capable of processing such sound into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 401 in case of the phone call mode.

The mobile terminal 400 also includes at least one sensor 405, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor that can adjust the brightness of the display panel 4061 according to the brightness of ambient light, and a proximity sensor that can turn off the display panel 4061 and/or the backlight when the mobile terminal 400 is moved to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally three axes), detect the magnitude and direction of gravity when stationary, and can be used to identify the posture of the mobile terminal (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), and vibration identification related functions (such as pedometer, tapping); the sensors 405 may also include a fingerprint sensor, a pressure sensor, an iris sensor, a molecular sensor, a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, etc., which will not be described in detail herein.

The display unit 406 is used to display information input by the user or information provided to the user. The Display unit 406 may include a Display panel 4061, and the Display panel 4061 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.

The user input unit 407 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the mobile terminal. Specifically, the user input unit 407 includes a touch panel 4071 and other input devices 4072. Touch panel 4071, also referred to as a touch screen, may collect touch operations by a user on or near the touch panel 4071 (e.g., operations by a user on or near touch panel 4071 using a finger, a stylus, or any other suitable object or attachment). The touch panel 4071 may include two parts, a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 410, receives a command from the processor 410, and executes the command. In addition, the touch panel 4071 can be implemented by using various types such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. In addition to the touch panel 4071, the user input unit 407 may include other input devices 4072. Specifically, the other input devices 4072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a track ball, a mouse, and a joystick, which are not described herein again.

Further, the touch panel 4071 can be overlaid on the display panel 4061, and when the touch panel 4071 detects a touch operation thereon or nearby, the touch operation is transmitted to the processor 410 to determine the type of the touch event, and then the processor 410 provides a corresponding visual output on the display panel 4061 according to the type of the touch event. Although in fig. 4, the touch panel 4071 and the display panel 4061 are two separate components to implement the input and output functions of the mobile terminal, in some embodiments, the touch panel 4071 and the display panel 4061 may be integrated to implement the input and output functions of the mobile terminal, which is not limited herein.

The interface unit 408 is an interface through which an external device is connected to the mobile terminal 400. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 408 may be used to receive input (e.g., data information, power, etc.) from external devices and transmit the received input to one or more elements within the mobile terminal 400 or may be used to transmit data between the mobile terminal 400 and external devices.

The memory 409 may be used to store software programs as well as various data. The memory 409 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 409 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 410 is a control center of the mobile terminal, connects various parts of the entire mobile terminal using various interfaces and lines, and performs various functions of the mobile terminal and processes data by operating or executing software programs and/or modules stored in the memory 409 and calling data stored in the memory 409, thereby integrally monitoring the mobile terminal. Processor 410 may include one or more processing units; preferably, the processor 410 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 410.

It should be understood that, in the case that the power amplifier chip is a part of the mobile terminal, the processor 410 may implement the function of the power amplifier chip in the above embodiment. Specifically, the processor 410 calculates the resistance value of the strain component according to the voltage values at the two ends of the strain component, and determines the amplitude of the diaphragm based on the difference value between the resistance value of the strain component and the initial resistance value of the strain component.

Optionally, the processor 410 may further adjust the signal strength of the signal source of the speaker according to the amplitude of the diaphragm of the speaker, so as to improve the performance of the speaker and prolong the life of the speaker.

In the embodiment of the invention, the mobile terminal detects the voltage value at two ends of the strain component in the loudspeaker through the processor 410 to determine the amplitude of the loudspeaker, and adjusts the signal intensity of the signal source of the loudspeaker based on the amplitude, so that the loudspeaker is driven to work at the maximum amplitude in the amplitude protection range, and the performance of the loudspeaker is improved.

The mobile terminal 400 may further include a power supply 411 (e.g., a battery) for supplying power to various components, and preferably, the power supply 411 may be logically connected to the processor 410 through a power management system, so as to implement functions of managing charging, discharging, and power consumption through the power management system.

In addition, the mobile terminal 400 includes some functional modules that are not shown, and thus, are not described in detail herein.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A loudspeaker, comprising:

the device comprises a shell, a vibrating diaphragm and a folding ring;

wherein, a strain component is arranged at the inner side of the folding ring, and the strain component is a component formed by a metal material with a strain effect or a semiconductor material with a piezoresistive effect;

the strain component is electrically connected with a power amplifier chip, and the power amplifier chip is a part of the loudspeaker, or the power amplifier chip is a component electrically connected with the loudspeaker;

the power amplifier chip is electrically connected with the strain component to detect the amplitude of the vibrating diaphragm, the power amplifier chip detects the amplitude of the vibrating diaphragm according to the resistance value of the strain component, and the power amplifier chip adjusts the signal intensity of a signal source of the loudspeaker based on the amplitude so as to drive the loudspeaker to work with the maximum amplitude within the amplitude protection range;

the power amplifier chip detects voltage values at two ends of the strain assembly and determines the amplitude of the vibrating diaphragm according to the voltage values;

the strain assembly is connected with the power amplifier chip in parallel, the strain assembly is grounded with a first node of the power amplifier chip, a second node is electrically connected with a constant voltage source through a first preset resistance unit, and the resistance value of the first preset resistance unit is constant;

the power amplifier chip is connected with the second preset resistance unit in parallel, the power amplifier chip is grounded with a first node of the second preset resistance unit, a second node is electrically connected with the constant voltage source through the strain component, and the resistance value of the second preset resistance unit is constant.

2. The loudspeaker of claim 1, wherein the power amplifier chip adjusts the signal strength of the signal source of the loudspeaker based on the amplitude of the diaphragm.

3. A mobile terminal characterized by comprising a loudspeaker according to any of claims 1 to 2.