CN113286239A - Voltage output method and device for microphone, microphone and electronic equipment - Google Patents
Voltage output method and device for microphone, microphone and electronic equipment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/04—Microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/004—Monitoring arrangements; Testing arrangements for microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/003—Mems transducers or their use
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Abstract
The application discloses a voltage output method and device for a microphone, the microphone and electronic equipment, and belongs to the technical field of electronics. The microphone includes: a microphone chip; the sound pressure detection module is connected with the microphone chip; the charge pump comprises a voltage output circuit and a control module, the control module is respectively connected with the voltage output circuit and the sound pressure detection module, and the voltage output circuit is connected with the input end of the microphone chip; the control module receives a detection signal acquired by the sound pressure detection module and adjusts the voltage output by the voltage output circuit to the microphone chip according to the detection signal.
Description
Technical Field
The application belongs to the technical field of electronics, and particularly relates to a voltage output method and device for a microphone, the microphone and electronic equipment.
Background
The silicon microphone is composed of a Micro-Electro-Mechanical System (MEMS) chip and an Application Specific Integrated Circuit (ASIC) chip, wherein the ASIC chip provides a bias voltage to the MEMS chip and performs impedance matching and amplification processing on an electrical signal output from the MEMS chip. During the operation of the silicon microphone, when the sound pressure level of the sound signal picked up by the microphone is too high, the output signal of the microphone is seriously distorted.
Disclosure of Invention
The purpose of the embodiments of the present application is to provide a microphone, which can solve the problem that the output signal of the existing microphone is seriously distorted due to the overlarge sound pressure level of the picked-up sound signal.
In a first aspect, an embodiment of the present application provides a microphone, including:
a microphone chip;
the sound pressure detection module is connected with the microphone chip;
the charge pump comprises a voltage output circuit and a control module, the control module is respectively connected with the voltage output circuit and the sound pressure detection module, and the voltage output circuit is connected with the input end of the microphone chip;
the control module receives a detection signal acquired by the sound pressure detection module and adjusts the voltage output by the voltage output circuit to the microphone chip according to the detection signal.
In a second aspect, an embodiment of the present application provides an electronic device, including the microphone according to the first aspect.
In a third aspect, an embodiment of the present application provides a voltage output method for a microphone, which is applied to the microphone according to the first aspect, and the method includes:
acquiring a detection signal acquired by a sound pressure detection module;
and controlling the voltage output to the microphone chip by the charge pump to be reduced under the condition that the signal amplitude of the detection signal is greater than a preset first threshold value.
In a fourth aspect, an embodiment of the present application provides a voltage output apparatus for a microphone, which is applied to the microphone according to the first aspect, and the apparatus includes:
the acquisition module is used for acquiring the detection signal acquired by the sound pressure detection module;
and the voltage adjusting module is used for controlling the voltage output to the microphone chip by the charge pump to be reduced under the condition that the signal amplitude of the detection signal is greater than a preset first threshold value.
In a fifth aspect, embodiments of the present application provide an electronic device, which includes a processor, a memory, and a program or instructions stored on the memory and executable on the processor, and when executed by the processor, implement the steps of the method according to the first aspect.
In a sixth aspect, embodiments of the present application provide a readable storage medium, on which a program or instructions are stored, which when executed by a processor implement the steps of the method according to the first aspect.
In a seventh aspect, an embodiment of the present application provides a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and the processor is configured to execute a program or instructions to implement the method according to the first aspect.
In the embodiment of the application, a control module is added in a circuit structure of the charge pump, and the control module is connected with a sound pressure detection module to control the work of a voltage output circuit according to a detection signal collected by the sound pressure detection module, so that the output voltage of a microphone chip is adjusted according to the sound pressure level of a sound signal picked up by a microphone, the sensitivity of the microphone can be reduced, and the serious distortion of the output signal caused by the overlarge sound pressure level of the sound signal picked up by the microphone is avoided. In addition, the circuit structure of the charge pump of the microphone is improved, extra capacitance is not required to be added, extra system noise can be avoided, and system power consumption of the microphone cannot be increased. In addition, the microphone can be realized based on the structure of the existing microphone, and the production process is simple.
Drawings
Fig. 1 is a schematic structural diagram of a microphone according to an embodiment of the present disclosure;
fig. 2 is a schematic hardware structure diagram of a microphone according to an embodiment of the present disclosure;
fig. 3 is a schematic hardware structure diagram of another microphone provided in the embodiment of the present application;
fig. 4 is a schematic hardware structure diagram of another microphone provided in the embodiment of the present application;
fig. 5 is a schematic circuit diagram of a charge pump according to an embodiment of the present disclosure;
fig. 6 is a schematic circuit diagram of another charge pump according to an embodiment of the present disclosure;
fig. 7 is a schematic circuit diagram of another charge pump according to an embodiment of the present disclosure;
fig. 8 is a schematic flowchart of a voltage output method for a microphone according to an embodiment of the present disclosure;
fig. 9 is a schematic flowchart of another voltage output method for a microphone according to an embodiment of the present disclosure;
fig. 10 is a schematic hardware structure diagram of a voltage output apparatus for a microphone according to an embodiment of the present disclosure;
fig. 11 is a schematic hardware structure diagram of an electronic device according to an embodiment of the present application;
fig. 12 is a schematic hardware structure diagram of another electronic device provided in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present disclosure.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
Referring to fig. 1, the microphone 100 includes a circuit board 110, a housing 120, a MEMS chip 130 and an ASIC chip 140, the housing 120 covers the circuit board 110 and forms a cavity with the circuit board 110, the MEMS chip 130 and the ASIC chip 140 are disposed in the cavity, the MEMS chip 130 is connected to the ASIC chip 140, and the MEMS chip 130 and the ASIC chip 140 are disposed on the circuit board 110. The circuit board 110 of the microphone 100 is further provided with a sound pickup hole 160, the sound pickup hole 160 is disposed corresponding to the MEMS chip 130, and the sound pickup hole 160 can allow external sound and air flow to enter the microphone 100. The ASIC chip 140 provides a bias voltage for the MEMS chip 130, and performs impedance matching and amplification on an electrical signal output from the MEMS chip. During the operation of the microphone, when the sound pressure level of the sound signal picked up by the microphone is too high, the output signal of the microphone is severely distorted.
In the related art, a support structure may be added between the diaphragm and the back plate of the MEMS chip to improve the AOP (Acoustic Overload Point) performance of the microphone, so that the microphone can bear a larger sound pressure signal. However, this approach may result in a decrease in the mechanical sensitivity of the MEMS chip, resulting in a decrease in the sensitivity of the microphone.
In the related art, the operating voltage of the ASIC chip may also be increased to raise the clipping distortion threshold of the operational amplifier, thereby reducing the distortion of the microphone. However, this approach may affect the amplitude of the active portion of the microphone output signal due to the reduced gain.
In the related art, the output voltage of the MEMS chip can be adjusted by changing the size of the designed capacitance of the MEMS chip, thereby reducing the distortion of the microphone. However, this approach requires integrating a capacitor in the MEMS chip, occupies a large chip area, and is prone to introduce additional interference and noise, which affects the performance of the microphone.
In order to solve the above problem, an embodiment of the present application provides a microphone, in which a circuit structure of a charge pump is improved to adjust a magnitude of an output voltage according to a sound pressure level of a sound signal picked up by a MEMS chip, so as to reduce a sensitivity of the MEMS chip, and avoid a serious distortion of an output signal due to an excessively large sound pressure level of the sound signal picked up by an existing microphone.
The microphone provided by the embodiment of the present application is described in detail by the specific embodiments and application scenarios thereof with reference to the accompanying drawings.
Please refer to fig. 2, which is a schematic diagram of a hardware structure of a microphone according to an embodiment of the present disclosure. The microphone includes a microphone chip 210, a sound pressure detection module 220, and a charge pump 230. The sound pressure detection module 220 is connected to the microphone chip 210.
The charge pump 230 includes a voltage output circuit 231 and a control module 232, the control module 232 is connected to the voltage output circuit 231 and the sound pressure detection module 220, respectively, and the voltage output circuit 231 is connected to an input terminal of the microphone chip 210.
The control module 232 receives the detection signal collected by the sound pressure detection module 220, and adjusts the voltage output from the voltage output circuit 231 to the microphone chip 210 according to the detection signal.
In the present embodiment, the microphone chip 210 is used to convert a sound signal into an electrical signal. The microphone chip 210 may be a MEMS (Micro-Electro-Mechanical System) chip. The sound pressure detection module 220 may be used to detect the sound pressure level of the sound signal picked up by the microphone chip 210. The charge pump 230 is used to provide a bias voltage to the microphone chip 210.
Specifically, during the operation of the microphone, the sound pressure detection module 220 detects the sound pressure level of the sound signal picked up by the microphone chip 210 to obtain a detection signal, and then the sound pressure detection module 220 outputs the detection signal to the control module 232, and the control module 232 controls the operation of the voltage output circuit 231 according to the detection signal to adjust the magnitude of the output voltage of the microphone chip 210.
According to the embodiment of the application, the control module is added in the circuit structure of the charge pump and is connected with the sound pressure detection module, so that the work of the voltage output circuit is controlled according to the detection signal collected by the sound pressure detection module, the output voltage of the microphone chip is adjusted according to the sound pressure level of the sound signal picked up by the microphone, the sensitivity of the microphone can be reduced, and the serious distortion of the output signal caused by the overlarge sound pressure level of the sound signal picked up by the microphone is avoided. In addition, the circuit structure of the charge pump of the microphone is improved, extra capacitance is not required to be added, extra system noise can be avoided, and system power consumption of the microphone cannot be increased. In addition, the microphone can be realized based on the structure of the existing microphone, and the production process is simple.
In some embodiments, the acoustic pressure detection module 220 is an acoustic pressure sensor 220-1. Referring to fig. 3, the sound pressure sensor 220-1 is disposed in the sound input channel of the microphone chip 210, and the output terminal of the sound pressure sensor 220-1 is connected to the control module 232 of the charge pump 230.
In this embodiment, the sound pressure sensor 220 is used to detect the sound pressure level of the sound signal picked up by the microphone chip 210. Specifically, the sound pressure sensor 220-1 is located in the sound inlet channel of the microphone chip 210, and the sound pressure sensor 220-1 can pick up the sound signal entering the microphone chip 210, convert the sound signal to generate a detection signal, and output the detection signal to the control module 232 of the charge pump 230. The signal amplitude of the detection signal may reflect the magnitude of the sound pressure level of the sound signal picked up by the microphone chip 210.
In the embodiment of the application, the sound pressure sensor is arranged in the microphone, so that the sound pressure level of the sound signal picked up by the microphone chip can be directly detected, the charge pump can be controlled to work according to the sound pressure level of the sound signal detected by the sound pressure sensor, the output voltage of the microphone chip can be adjusted, the sensitivity of the microphone can be reduced, and the serious distortion of the output signal caused by the overlarge sound pressure level of the sound signal picked up by the microphone can be avoided.
In some embodiments, the acoustic pressure detection module 220 is a sampling circuit 220-2. Referring to fig. 4, an input terminal of the sampling circuit 220-2 is connected to an output terminal of the microphone chip 210, and an output terminal of the sampling circuit 220-2 is connected to the control module 232 of the charge pump 230. In the present embodiment, the sampling circuit 220-2 may be used to detect the amplitude of the output signal of the microphone chip 210. The amplitude of the output signal of the microphone chip 210 may reflect the sound pressure level of the sound signal picked up by the microphone chip 210. Specifically, the sampling circuit 220-2 is connected in parallel between the microphone chip 210 and the path of the amplifying circuit, and the sampling circuit 220-2 may detect the amplitude of the output signal of the microphone chip 210, generate a detection signal according to the amplitude of the output signal of the microphone chip 210, and then output the detection signal to the control module 232 of the charge pump 230.
It should be noted that the sampling circuit 220-2 may be an existing voltage sampling circuit, or may be another circuit capable of implementing a function of detecting an amplitude of an output signal of the microphone chip 210, which is not limited in this embodiment of the present application.
In the embodiment of the application, by arranging the sampling circuit, the amplitude of the output signal of the microphone chip can be detected, and then the charge pump can be controlled to work according to the amplitude of the output signal so as to adjust the output voltage of the microphone chip, so that the sensitivity of the microphone can be reduced, and the serious distortion of the output signal caused by the overlarge sound pressure level of the sound signal picked up by the microphone is avoided. In addition, according to the embodiment of the application, the microphone chip does not need to be improved by arranging the sampling circuit, and the implementation mode is simpler.
In some embodiments, the charge pump may be a Dickson (dikinson) architecture charge pump.
As shown in fig. 5, the voltage output circuit 231 includes a first switch 2311 and N stages of voltage output units sequentially connected in series, a control terminal of the first switch 2311 is connected to a first terminal of the first switch 2311, the control terminal of the first switch 2311 is connected to a power supply voltage, a second terminal of the first switch 2311 is connected to one terminal of the N stages of voltage output units sequentially connected in series, and another terminal of the N stages of voltage output units sequentially connected in series serves as a voltage output terminal Vout for being connected to an input terminal of the microphone chip 210 to provide a bias voltage for the microphone chip 210.
The voltage output unit includes a second switch and a first capacitor. The control end of the second switch is connected with the first end of the second switch, the first end of the second switch is connected with the upper-stage voltage output unit, and the second end of the second switch is connected with the lower-stage voltage output unit. The first end of the first capacitor is connected with the control end of the second switch, and the second end of the first capacitor is connected with a clock signal.
The N-level voltage output units are respectively marked as 2312-1, 2312-2, …, 2312-N-1 and 2312-N, second switches in the N-level voltage output units are respectively marked as M1, M2, …, MN-1 and MN, and first capacitors in the N-level voltage output units are respectively marked as C1, C2, …, CN-1 and CN. N is a positive integer, and N is greater than or equal to 2.
In this embodiment, the first switch 2311 and the second switch may be MOS transistors (Metal-Oxide-Semiconductor, field effect transistors), such as NMOS transistors and PMOS transistors, which is not limited in this embodiment.
The clock signal connected to the first capacitor may be provided by an oscillator, that is, the charge pump of the embodiment of the present application may further include a clock generation circuit, and the clock generation circuit may include an oscillator, for example, an RC oscillator. The oscillator may generate a clock signal with a corresponding amplitude and frequency according to the requirements of the actual application. Illustratively, the clock generation circuit may generate 2 or more clock phases. For example, 2 clock signals are generated, denoted as CLK, CLK', with a phase difference of 180 °. Two clock signals with opposite phases are respectively output to two adjacent first capacitors, for example, CLK is connected with the first capacitors of the odd-numbered stages, and CLK' is connected with the first capacitors of the even-numbered stages.
The working principle of the charge pump is as follows: and sequentially turning on second switches in the multi-stage voltage output unit through two clock signals with non-overlapping phases of CLK and CLK', sequentially charging first capacitors in the multi-stage voltage output unit, and finally outputting the accumulation of the voltages on the multi-stage first capacitors. Wherein, the voltage output by each stage of voltage output unit is related to the high and low levels of the accessed clock signal. Based on this, the output stage number of the charge pump can be controlled by controlling the inversion and the duration of the clock signal, so as to control the output voltage of the microphone chip.
In the embodiment of the present application, the voltage output circuit of the charge pump includes an N-level voltage output unit, and can provide bias voltages with different magnitudes for the microphone chip according to the sound pressure level of the sound signal picked up by the microphone chip under the control of the control module, so that the microphone chip outputs output voltages with different magnitudes, thereby reducing the sensitivity of the microphone and avoiding serious distortion of the output signal caused by an excessively large sound pressure level of the sound signal picked up by the microphone.
In this embodiment, the control module may be a nand gate circuit, and the control module may also be a data selector. These two cases will be specifically described below.
In some embodiments, control module 232 includes M nand gates; a first input end of the NAND gate is connected with a clock signal, a second input end of the NAND gate is connected with the sound pressure detection module, and an output end of the NAND gate is connected with a second end of the first capacitor; wherein M is equal to N.
It is understood that the control module 232 includes nand gates corresponding to each voltage output unit in the voltage output voltage, that is, the number of nand gates is equal to the number of voltage output units.
In this embodiment, two input terminals of the nand gate are respectively connected to the clock signal and the output terminal of the sound pressure detection module. And when the accessed clock signal is at a high level and the signal output by the sound pressure detection module is at a high level, the output signal of the NAND gate is at a low level. And when the accessed clock signal is at a low level and/or the signal output by the sound pressure detection module is at a low level, the output signal of the NAND gate is at a high level. For example, when the signal output by the sound pressure detection module is at a high level, the signal output by the nand gate is determined by the clock signal, when the clock signal connected to the nand gate is at a high level, the signal output by the nand gate is at a low level, and when the clock signal connected to the nand gate is at a low level, the signal output by the nand gate is at a high level. For example, when the signal output by the sound pressure detection module is at a low level, the signal output by the nand gate is at a high level regardless of whether the clock signal is at a high level or a low level. Based on this, the output signal of the nand gate can be controlled by the sound pressure detection module to control the level input to the first capacitor, and further the charge pump can be controlled to output the bias voltage to the microphone chip.
It should be noted that the sound pressure detection module may include a plurality of output terminals, and the plurality of output terminals of the sound pressure detection module are respectively connected to the nand gates, that is, each output terminal of the sound pressure detection module may individually control the output of one of the nand gates. In this way, during a specific operation, the charge pump is normally full-level output under the condition that the sound pressure level of the sound signal picked up by the microphone chip meets the condition, and at this time, if the sound pressure level of the sound signal picked up by the microphone chip does not meet the condition, the output voltage of the charge pump may be gradually reduced from the last stage voltage output unit of the charge pump.
The following describes a process of controlling the output voltage of the charge pump through the nand gate by taking the charge pump including the 4-stage voltage output unit shown in fig. 6 as an example.
As shown in fig. 6, the microphone includes a charge pump 230 and a sound pressure detection module 220. The charge pump 230 includes a voltage output circuit 231 and four nand gates 232-1. The sound pressure detection module 220 includes four output ends, which correspond to the four nand gates one by one;
the voltage output circuit 231 comprises a first switch 2311 and 4-stage voltage output units which are sequentially connected in series, wherein the control end of the first switch 2311 is connected with the first end of the first switch 2311, the control end of the first switch 2311 is connected with a power supply voltage, the second end of the first switch 2311 is connected with one end of the 4-stage voltage output units which are sequentially connected in series, and the other end of the 4-stage voltage output unit which are sequentially connected in series is used as a voltage output end Vout and is used for being connected with the input end of the microphone chip 210 so as to provide bias voltage for the microphone chip 210;
the voltage output unit includes a second switch and a first capacitor. The control end of the second switch is connected with the first end of the second switch, the first end of the second switch is connected with the upper-stage voltage output unit, and the second end of the second switch is connected with the lower-stage voltage output unit. The first end of the first capacitor is connected with the control end of the second switch, and the second end of the first capacitor is connected with the output end of the NAND gate 232-1;
a first input end of the nand gate 232-1 is connected with a clock signal, a second input end of the nand gate 232-1 is connected with an output end of the sound pressure detection module 220, and an output end of the nand gate 232-1 is connected with a second end of the first capacitor;
the 4-stage voltage output units are respectively marked as 2312-1, 2312-2, 2312-3 and 2312-4, the second switches in the 4-stage voltage output units are respectively marked as M1, M2, M3 and M4, and the first capacitors in the 4-stage voltage output units are respectively marked as C1, C2, C3 and C4.
The working process of the charge pump is as follows: at the beginning, at time T1, when the clock signal CLK is at a low level and the clock signal CLK' is at a high level, the first switch 2311 is turned on to charge the first capacitor C1 until the voltage at the first end of the second switch M1 is Vin-Vth; at time T2, the clock signal CLK is high, the clock signal CLK' is low, the second switch M1 is turned on, the first capacitor C2 is charged until the voltage at the first terminal of the second switch M2 is Vin + VCLK-2 Vth; at time T3, the clock signal CLK is low, the clock signal CLK' is high, the second switch M2 is turned on, the first capacitor C3 is charged until the voltage at the first terminal of the second switch M3 is Vin +2VCLK-3 Vth; at time T4, the clock signal CLK is high, the clock signal CLK' is low, the second switch M3 is turned on, the first capacitor C4 is charged until the voltage at the first terminal of the second switch M4 is Vin +3VCLK-4 Vth; at time T5, the clock signal CLK is low, the clock signal CLK' is high, the second switch M4 is turned on, and the output voltage of the charge pump is Vin +4VCLK－5Vth。
Under the condition that the sound pressure level of the sound signal picked up by the microphone chip meets the condition, the output signal of the NAND gate output to the last stage by the sound pressure detection module is controlled to be at a low level, at the moment, the signal connected into the first capacitor C4 is at the low level, the charge pump keeps full-stage output, namely the output voltage of the charge pump is Vin +4VCLK－5Vth。
Sound of sound signal picked up at microphone chipUnder the condition that the voltage level does not meet the condition, the output signal output to the NAND gate of the last stage by the sound pressure detection module is controlled to be at a high level, at the moment, when the clock signal CLK' is also at a high level, the signal connected to the first capacitor C4 is at a low level, so that the output voltage of the charge pump is reduced, namely the output voltage of the charge pump is Vin +3VCLK－5Vth。
Then, if the sound pressure level of the sound signal picked up by the microphone chip does not meet the condition, the output signals output to the nand gates of the last two poles by the sound pressure detection module are controlled to be all high level, at this time, when the clock signal CLK' is also high level, the signal connected to the first capacitor C3 is low level, so that the output voltage of the charge pump is reduced, that is, the output voltage of the charge pump is Vin +2VCLKAnd-5 Vth, until the sound pressure level of the sound signal picked up by the microphone chip meets the condition, controlling the signal output to the NAND gate by the sound pressure detection module to be at a low level.
In the embodiment of the application, the nand gate is arranged between the clock signal and the first capacitor, and two input ends of the nand gate are respectively connected to the clock signal and the output end of the sound pressure detection module, so that the output signal of the nand gate is controlled by the sound pressure detection module to control the level input to the first capacitor, and therefore when the sound pressure level of the sound signal picked up by the microphone chip is too high, the bias voltage output from the charge pump to the microphone chip is reduced, the output voltage of the microphone chip is reduced, an overload signal is prevented from being generated, and the output signal is prevented from being distorted; when the sound pressure level of the sound signal picked up by the microphone chip meets the requirement, the bias voltage output from the charge pump to the microphone chip is kept, so that the output voltage of the microphone chip is kept unchanged, and the performance of the microphone under the normal sound pressure environment can be ensured to be unchanged.
In other embodiments, the control module 232 is a data selector. The data selector is connected between the other end of the N-stage voltage output units and the input end of the microphone chip, the N-stage voltage output units are sequentially connected in series, a plurality of input ends of the data selector are respectively connected with the voltage output units of each stage, the control end of the data selector is connected with the sound pressure detection module, and the output end of the data selector is connected with the input end of the microphone chip.
The data selector may be a 1-from-2 data selector, a 1-from-4 data selector, a 1-from-8 data selector, a 1-from-16 data selector, or the like. The working principle of the data selector is that the binary coding uses n-way address codes to determine the output state of the data selector, namely the magnitude of the bias voltage output to the microphone chip. For example, the selector for the n-way address code includes four output states, 00, 01, 10 and 11, and each output state corresponds to a different output voltage.
It will be appreciated that the data selector comprises a plurality of input terminals, at least one control terminal and an output terminal. The multiple input ends of the data selector are connected with the voltage output unit of the charge pump, at least one control end of the data selector is connected with the output end of the sound pressure detection module, and the output end of the data selector serves as the voltage output end of the charge pump and is used for being connected with the input end of the microphone chip so as to provide bias voltage for the microphone chip. That is, the output terminal of the sound pressure detection module is connected to at least one control terminal of the data selector, so as to control the output of the data selector, that is, the output voltage of the charge pump, according to the signals of different high and low levels output by the sound pressure detection module. It should be noted that those skilled in the art can select the data selector as needed.
The following describes a process of controlling an output voltage of the charge pump through the data selector, taking the charge pump including the 4-stage voltage output unit shown in fig. 7 as an example.
As shown in fig. 7, the microphone includes a charge pump 230 and a sound pressure detection module 220. The charge pump 230 includes a voltage output circuit 231 and a data selector 232-2. The data selector 232-2 is a 1-out-of-4 selector.
The voltage output circuit 231 comprises a first switch 2311 and 4-stage voltage output units which are sequentially connected in series, wherein the control end of the first switch 2311 is connected with the first end of the first switch 2311, the control end of the first switch 2311 is connected with a power supply voltage, the second end of the first switch 2311 is connected with one end of the 4-stage voltage output units which are sequentially connected in series, and the other end of the 4-stage voltage output units which are sequentially connected in series is connected with the data selector 232-2;
the voltage output unit includes a second switch and a first capacitor. The control end of the second switch is connected with the first end of the second switch, the first end of the second switch is connected with the upper-stage voltage output unit, and the second end of the second switch is connected with the lower-stage voltage output unit. The first end of the first capacitor is connected with the control end of the second switch, and the second end of the first capacitor is connected with a clock signal;
the data selector 232-2 comprises four input terminals, Vin0, Vin1, Vin2 and Vin3, the input terminal Vin0 of the data selector 232-2 is connected to the second terminal of the second switch M1, the input terminal Vin1 of the data selector 232-2 is connected to the second terminal of the second switch M2, the input terminal Vin2 of the data selector 232-2 is connected to the second terminal of the second switch M3, and the input terminal Vin3 of the data selector 232-2 is connected to the second terminal of the second switch M4. The data selector 232-2 further comprises two control terminals a0 and a1, respectively, and the control terminals a0 and a1 of the data selector 232-2 are connected to two output terminals of the sound pressure detecting module, respectively. The output terminal of the data selector 232-2 is used as the voltage output terminal Vout of the charge pump, and is connected to the input terminal of the microphone chip;
the 4-stage voltage output units are respectively marked as 2312-1, 2312-2, 2312-3 and 2312-4, the second switches in the 4-stage voltage output units are respectively marked as M1, M2, M3 and M4, and the first capacitors in the 4-stage voltage output units are respectively marked as C1, C2, C3 and C4.
The working principle of the charge pump is as follows: in the initial stage, referring to the above process, the output voltage of the charge pump is Vin +4VCLK-5 Vth. And four input states of the data selector 232-2 correspond to different output voltages. When the sound pressure level of the sound signal picked up by the microphone chip is less than a first set value, controlling the sound pressure detection module to respectively input a high level (11) to the control terminals A0 and A1 of the data selector, wherein the output voltage Vout is equal to Vin 3; when the sound pressure level of the sound signal picked up by the microphone chip is greater than a first set value, controlling the sound pressure detection module to input a high level 1 to the control end A0 of the data selector and input a low level 0 to the control end A1, wherein at the moment, the output voltage Vout is equal to Vin 2; the sound pressure level of the sound signal picked up by the microphone chip is largeWhen the second setting value is reached, the sound pressure detection module is controlled to input a low level 0 to the control terminal a0 of the data selector and input a high level 1 to the control terminal a1, and at this time, the output voltage Vout is equal to Vin 1; when the sound pressure level of the sound signal picked up by the microphone chip is greater than a third set value, the sound pressure detection module is controlled to input a low level 0 to the control terminal a0 of the data selector and input a low level 0 to the control terminal a1, at this time, the output voltage Vout is equal to Vin0, wherein the second set value is greater than the first set value, and the third set value is greater than the second set value.
In the embodiment of the application, the data selector is added in the circuit structure of the charge pump, a plurality of input ends of the data selector are connected with the voltage output unit of the charge pump, at least one control end of the data selector is connected with the output end of the sound pressure detection module, and the output end of the data selector is used as the voltage output end of the charge pump, so that the output voltage of the charge pump can be controlled according to the sound pressure level of a sound signal picked up by a microphone, an overload signal caused by overlarge sound pressure level of the picked-up sound signal is avoided, and distortion of the output signal is avoided. Moreover, the implementation process is simple.
In some embodiments, as shown in fig. 2-4, the microphone also includes a bandgap reference source circuit 240. A first output terminal of the bandgap reference source circuit 240 is connected to the charge pump 230, a second output terminal of the bandgap reference source circuit 240 is connected to the amplifying circuit 250, and the bandgap reference source circuit 240 is configured to provide a power supply voltage for the charge pump and the operational amplifier.
In some embodiments, as shown in fig. 2 to 4, the microphone further includes an amplifying circuit 250, and the amplifying circuit 250 is connected to the output terminal of the microphone chip 210. The amplifying circuit is used for amplifying the signal output by the microphone chip 210 and outputting the signal to the next stage.
For example, with continued reference to fig. 2, 3, or 4, the amplifying circuit 250 may include an operational amplifier 251 and a low dropout regulator 252. The input end of the low dropout regulator 252 is connected to the second output end of the bandgap reference source circuit 240, and the output end of the low dropout regulator 252 is connected to the power input end of the operational amplifier 251. The signal input end of the operational amplifier 251 is connected with the output end of the microphone chip 210, and the signal output end of the operational amplifier 251 is used for connecting a next-stage circuit.
The charge pump, the bandgap reference source Circuit, and the amplifier Circuit of the microphone are implemented in an ASIC (Application Specific Integrated Circuit) chip. And when the sound pressure detection module is the sampling circuit described in the foregoing embodiment, the charge pump, the bandgap reference source circuit, the amplifying circuit, and the sampling circuit of the microphone are implemented in an ASIC chip.
The embodiment of the application also provides an electronic device, which comprises the microphone of the embodiment. The electronic equipment can be a mobile phone, a tablet computer, a notebook computer, wearable equipment and the like.
Please refer to fig. 8, which is a flowchart illustrating a voltage output method for a microphone according to an embodiment of the present disclosure. The method may be applied to the microphone of the foregoing embodiment, and may also be applied to the electronic device of the foregoing embodiment. As shown in fig. 8, the method may include steps 8100-8200.
8100, acquiring the detection signal acquired by the sound pressure detection module.
The detection signal may reflect the magnitude of the sound pressure level of the sound signal picked up by the microphone chip.
For example, in the case that the sound pressure detection module is a sound pressure sensor, the amplitude of the detection signal corresponds to the sound pressure level of the sound signal picked up by the microphone chip. For example, in the case that the sound pressure detection module is a sampling circuit, the amplitude of the detection signal corresponds to the amplitude of the output signal of the microphone chip.
The first threshold may measure whether the sound pressure level of the sound signal picked up by the microphone chip is too large. The first threshold may be set by a person skilled in the art according to actual conditions or experimental simulation results, which is not limited in the embodiment of the present application.
In specific implementation, when the signal amplitude of the detection signal is greater than a preset first threshold, it indicates that the sound pressure level of the sound signal picked up by the microphone chip is too high, and at this time, the voltage output by the charge pump to the microphone chip is controlled to decrease.
In some embodiments, after acquiring the detection signal acquired by the sound pressure detection module, the method may further include: and controlling the voltage output to the microphone chip by the charge pump to be kept unchanged when the signal amplitude of the detection signal is smaller than or equal to a preset first threshold value.
In specific implementation, when the signal amplitude of the detection signal is less than or equal to the preset first threshold, it indicates that the sound pressure level of the sound signal picked up by the microphone chip is within a normal range, and at this time, the voltage output to the microphone chip by the charge pump is controlled to be kept unchanged.
Referring to fig. 9, a specific example of the process of controlling the output voltage of the charge pump is described below.
9300, determining whether the signal amplitude of the detection signal is greater than a preset first threshold, if so, executing 9400, otherwise, executing 9500;
9400, controlling the output voltage of the charge pump to decrease;
and step 9500, controlling the output voltage of the charge pump to keep unchanged.
According to the embodiment of the application, the control module is added in the circuit structure of the charge pump and is connected with the sound pressure detection module, so that the work of the voltage output circuit is controlled according to the detection signal collected by the sound pressure detection module, the output voltage of the microphone chip is adjusted according to the sound pressure level of the sound signal picked up by the microphone, the sensitivity of the microphone can be reduced, and the serious distortion of the output signal caused by the overlarge sound pressure level of the sound signal picked up by the microphone is avoided. In addition, the sound pressure level of the sound signal picked up by the microphone is in the normal range, the voltage output to the microphone chip is controlled to be kept unchanged, and the quality of the signal output by the microphone chip can be ensured.
It should be noted that, according to the voltage output method for the microphone provided by the embodiment of the present application, the execution main body may be a voltage output device for the microphone, or a control module in the voltage output device for the microphone for executing the method for outputting the voltage for the microphone. The voltage output device for a microphone provided by the embodiment of the present application is described by taking a method for the voltage output device for a microphone to perform voltage output for the microphone as an example.
Corresponding to the above-described embodiment, referring to fig. 10, a voltage output apparatus 1000 for a microphone including a microphone chip, a charge pump, and a voltage detection module. The voltage output apparatus 1000 for a microphone includes an acquisition module 1001 and a voltage adjustment module 1002.
An obtaining module 1001 configured to obtain a detection signal acquired by the sound pressure detection module;
the voltage adjusting module 1002 is configured to control the voltage output by the charge pump to the microphone chip to decrease when the signal amplitude of the detection signal is greater than a preset first threshold.
In some embodiments, the voltage adjusting module 1002 is further configured to control the voltage output by the charge pump to the microphone chip to be kept unchanged when the signal amplitude of the detection signal is smaller than or equal to a preset first threshold.
The voltage output device for the microphone in the embodiment of the present application may be a device, or may be a component, an integrated circuit, or a chip in the terminal. The apparatus may be a mobile electronic device. The mobile electronic device may be, for example, a mobile phone, a tablet computer, a notebook computer, a palm top computer, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a Personal Digital Assistant (PDA), and the embodiments of the present application are not limited in particular.
The voltage output device for the microphone in the embodiment of the present application may be a device having an operating system. The operating system may be an Android (Android) operating system, an ios operating system, or other possible operating systems, and embodiments of the present application are not limited specifically.
The voltage output device for the microphone provided in the embodiment of the present application can implement each process implemented in the method embodiment of fig. 8, and is not described here again to avoid repetition.
Corresponding to the above embodiments, optionally, as shown in fig. 11, an electronic device 1100 is further provided in this embodiment of the present application, and includes a processor 1101, a memory 1102, and a program or an instruction stored in the memory 1102 and executable on the processor 1101, where the program or the instruction is executed by the processor 1101 to implement the processes of the above embodiment of the voltage output method for a microphone, and the same technical effects can be achieved, and are not repeated here to avoid repetition.
It should be noted that the electronic device in the embodiment of the present application includes the mobile electronic device described above.
Fig. 12 is a schematic hardware structure diagram of an electronic device implementing an embodiment of the present application.
The electronic device 1200 includes, but is not limited to: radio frequency unit 1201, network module 1202, audio output unit 1203, input unit 1204, sensors 1205, display unit 1206, user input unit 1207, interface unit 1208, memory 1209, and processor 1210.
Those skilled in the art will appreciate that the electronic device 1200 may further comprise a power source (e.g., a battery) for supplying power to the various components, and the power source may be logically connected to the processor 1210 via a power management system, so as to implement functions of managing charging, discharging, and power consumption via the power management system. The electronic device structure shown in fig. 12 does not constitute a limitation of the electronic device, and the electronic device may include more or less components than those shown, or combine some components, or arrange different components, and thus, the description is not repeated here.
The input unit 1204 is a microphone in this embodiment.
A processor 1210 configured to: acquiring a detection signal acquired by the sound pressure detection module; and under the condition that the signal amplitude of the detection signal is greater than a preset first threshold value, controlling the voltage output to the microphone chip by the charge pump to be reduced.
In some embodiments, the processor 1210, after acquiring the detection signal acquired by the acoustic pressure detection module, is further configured to: and controlling the voltage output to the microphone chip by the charge pump to be kept unchanged when the signal amplitude of the detection signal is smaller than or equal to a preset first threshold value.
According to the embodiment of the application, the control module is added in the circuit structure of the charge pump and is connected with the sound pressure detection module, so that the work of the voltage output circuit is controlled according to the detection signal collected by the sound pressure detection module, the output voltage of the microphone chip is adjusted according to the sound pressure level of the sound signal picked up by the microphone, the sensitivity of the microphone can be reduced, and the serious distortion of the output signal caused by the overlarge sound pressure level of the sound signal picked up by the microphone is avoided.
It should be understood that, in the embodiment of the present application, the input Unit 1204 may include a Graphics Processing Unit (GPU) 12041 and a microphone 12042, and the Graphics Processing Unit 12041 processes image data of still pictures or videos obtained by an image capturing device (such as a camera) in a video capturing mode or an image capturing mode. The display unit 1206 may include a display panel 12061, and the display panel 12061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 1207 includes a touch panel 12071 and other input devices 12072. A touch panel 12071, also referred to as a touch screen. The touch panel 12071 may include two parts of a touch detection device and a touch controller. Other input devices 12072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in detail herein. The memory 1209 may be used to store software programs as well as various data, including but not limited to application programs and an operating system. Processor 1210 may integrate an application processor, which handles primarily the operating system, user interface, applications, etc., and a modem processor, which handles primarily wireless communications. It is to be appreciated that the modem processor described above may not be integrated into processor 1210.
The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the program or the instruction implements the processes of the above-mentioned embodiment of the voltage output method for a microphone, and can achieve the same technical effects, and in order to avoid repetition, details are not repeated here.
The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and so on.
The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to execute a program or an instruction to implement each process of the above voltage output method for a microphone, and the same technical effect can be achieved, and in order to avoid repetition, details are not repeated here.
It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as system-on-chip, system-on-chip or system-on-chip, etc.
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. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
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 application may be embodied in the form of a computer 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, or a network device) to execute the method according to the embodiments of the present application.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (14)
1. A microphone, comprising:
a microphone chip;
the sound pressure detection module is connected with the microphone chip;
the charge pump comprises a voltage output circuit and a control module, the control module is respectively connected with the voltage output circuit and the sound pressure detection module, and the voltage output circuit is connected with the input end of the microphone chip;
the control module receives a detection signal acquired by the sound pressure detection module and adjusts the voltage output by the voltage output circuit to the microphone chip according to the detection signal.
2. The microphone according to claim 1, wherein the voltage output circuit comprises a first switch and N stages of voltage output units sequentially connected in series, a control end of the first switch is connected with a first end of the first switch, the control end of the first switch is connected with a power supply voltage, a second end of the first switch is connected with one end of the N stages of voltage output units sequentially connected in series, and the other end of the N stages of voltage output units sequentially connected in series is connected with an input end of the microphone chip;
the voltage output unit includes:
a control end of the second switch is connected with a first end of the second switch, the first end of the second switch is connected with the upper-stage voltage output unit, and a second end of the second switch is connected with the lower-stage voltage output unit;
a first end of the first capacitor is connected with a control end of the second switch, and a second end of the first capacitor is connected with a clock signal;
wherein N is a positive integer and is greater than or equal to 2.
3. The microphone of claim 2, wherein the control module comprises M nand gates;
a first input end of the NAND gate is connected with a clock signal, a second input end of the NAND gate is connected with the sound pressure detection module, and an output end of the NAND gate is connected with a second end of the first capacitor;
wherein M is equal to N.
4. The microphone of claim 2, wherein the control module is a data selector;
the data selector is connected between the other end of the N-stage voltage output units which are sequentially connected in series and the input end of the microphone chip, a plurality of input ends of the data selector are respectively connected with each stage of voltage output unit, the control end of the data selector is connected with the sound pressure detection module, and the output end of the data selector is connected with the input end of the microphone chip.
5. The microphone of claim 1, wherein the sound pressure detection module is a sound pressure sensor;
the sound pressure sensor is arranged on a sound inlet channel of the microphone chip, and the output end of the sound pressure sensor is connected with the control module of the charge pump.
6. The microphone of claim 1, wherein the sound pressure detection module is a sampling circuit;
the input end of the sampling circuit is connected with the output end of the microphone chip, and the output end of the sampling circuit is connected with the control module of the charge pump.
7. The microphone of claim 1, further comprising:
and the amplifying circuit is connected with the output end of the microphone chip.
8. The microphone of claim 7, further comprising:
and a first output end of the band-gap reference source circuit is connected with the charge pump, a second output end of the band-gap reference source circuit is connected with the amplifying circuit, and an input end of the band-gap reference source circuit is connected with a power supply voltage.
9. The microphone of claim 8, wherein the charge pump, the amplification circuit, and the bandgap reference source circuit are implemented within an ASIC chip.
10. An electronic device, characterized in that it comprises a microphone according to any of claims 1-9.
11. A voltage output method for a microphone, applied to the microphone according to any one of claims 1 to 9, the method comprising:
acquiring a detection signal acquired by a sound pressure detection module;
and controlling the voltage output to the microphone chip by the charge pump to be reduced under the condition that the signal amplitude of the detection signal is greater than a preset first threshold value.
12. The voltage output method of claim 11, further comprising:
and controlling the voltage output to the microphone chip by the charge pump to be kept unchanged under the condition that the signal amplitude of the detection signal is smaller than or equal to a preset first threshold value.
13. A voltage output device for a microphone, applied to the microphone according to any one of claims 1 to 9, the voltage output device comprising:
the acquisition module is used for acquiring the detection signal acquired by the sound pressure detection module;
and the voltage adjusting module is used for controlling the voltage output to the microphone chip by the charge pump to be reduced under the condition that the signal amplitude of the detection signal is greater than a preset first threshold value.
14. An electronic device comprising a processor, a memory, and a program or instructions stored on the memory and executable on the processor, the program or instructions when executed by the processor implementing the steps of the voltage output method for a microphone according to claim 11 or 12.
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| CN202110576102.8A CN113286239A (en) | 2021-05-25 | 2021-05-25 | Voltage output method and device for microphone, microphone and electronic equipment |
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| CN202110576102.8A CN113286239A (en) | 2021-05-25 | 2021-05-25 | Voltage output method and device for microphone, microphone and electronic equipment |
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