Audio noise suppression circuit and method, and electronic device
By outputting control signals when the chip is powered on to adjust the load value of the adjustable load module, the problem of audio noise of consumer electronic products is solved, the effect of reducing noise and power consumption is achieved, and the user experience is improved.
Patent Information
- Application Number
- CN202411374213.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-01-03
AI Technical Summary
The audio noise generated by consumer electronics during use affects the user experience, especially at night, and the prior art consumes a higher power consumption or is only applicable to some chips when reducing noise.
By outputting the first and second control signals when the chip is powered on, the load value of the adjustable load module is controlled to be a fixed value or a random jump value to adjust the circuit frequency, reduce the generation of audio noise, and reduce power consumption.
It effectively reduces the audio noise of consumer electronic products, reduces power consumption, adapts to light load scenarios, and improves user experience.
Smart Images
Figure CN119255157A_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present disclosure relate to the technical field of electronic circuits, and in particular to an audio noise suppression circuit, method, and electronic device. Background Art
[0002] As people's living standards improve, their expectations for consumer electronics are becoming increasingly demanding. However, when using consumer electronics like laptops and watches, audio noise can interfere with the user experience. This is especially true in the dead of night, when the human ear is more sensitive to audio noise. Therefore, audio noise has become a significant factor that significantly impacts the user experience of consumer electronics.
[0003] Therefore, how to optimize the audio noise of consumer electronic products has become a technical problem that needs to be solved urgently. Summary of the Invention
[0004] In view of this, one of the technical problems solved by the embodiments of the present disclosure is to provide an audio noise suppression circuit, method, and electronic device, which can optimize the audio noise of consumer electronic products.
[0005] In a first aspect, an embodiment of the present disclosure provides an audio noise suppression circuit, comprising: a microprocessor interface, configured to output a first control signal and a second control signal when a chip is powered on and a switching circuit of the chip starts to operate; and an adjustable load module, configured to receive the first control signal and the second control signal, and adjust the load value of the adjustable load module to a fixed value or a random jump value under the control of the first control signal and the second control signal.
[0006] In a second aspect, an embodiment of the present disclosure provides an audio noise suppression method, comprising: when a chip is powered on and a switching circuit of the chip starts working, outputting a first control signal and a second control signal; under the control of the first control signal and the second control signal, adjusting the load value of an adjustable load module to a fixed value or a random jump value.
[0007] In a third aspect, an embodiment of the present disclosure provides an electronic device, comprising: the audio noise suppression circuit described in the first aspect and a chip connected to the audio noise suppression circuit.
[0008] The audio noise suppression circuit of the disclosed embodiment outputs a first control signal and a second control signal when the chip is powered on via a microprocessor interface and the chip's switching circuit begins operation. The first and second control signals, in turn, control the load value of an adjustable load module to a fixed value or a randomly changing value. The disclosed embodiment can reduce audio noise in consumer electronic products, improving the user experience of these consumer electronic products. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Hereinafter, some specific embodiments of the present disclosure will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the drawings:
[0010] Figure 1 A circuit diagram of an audio noise suppression circuit;
[0011] Figure 2 This is a circuit diagram of an audio noise suppression circuit according to an embodiment of the present disclosure;
[0012] Figure 3 This is a circuit diagram of another audio noise suppression circuit according to an embodiment of the present disclosure;
[0013] Figure 4 This is a flow chart of an audio noise suppression method according to an embodiment of the present disclosure;
[0014] Figure 5 This is a flowchart of another audio noise suppression method according to an embodiment of the present disclosure. DETAILED DESCRIPTION
[0015] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and detailedly described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments in the embodiments of the present invention should fall within the scope of protection of the embodiments of the present invention.
[0016] In the following detailed description, reference is made to the accompanying drawings, which form a part of the detailed description and illustrate exemplary embodiments. In addition, it is understood that other embodiments may be utilized and structural and / or logical changes may be made without departing from the scope of the claimed subject matter. It should also be noted that directions and references (e.g., up, down, top, bottom, etc.) may be used merely to facilitate the description of features in the drawings. Therefore, the following detailed description is not to be construed in a limiting sense, and the scope of the claimed subject matter is limited solely by the appended claims and their equivalents.
[0017] In the following description, numerous details are set forth. However, it will be apparent to those skilled in the art that the embodiments herein may be practiced without these specific details. In some cases, well-known methods and apparatus are shown in block diagram form rather than in detail to avoid blurring the embodiments herein. References throughout this specification to "an embodiment" or "one embodiment" or "some embodiments" mean that the specific features, structures, functions, or characteristics described in conjunction with the embodiment are included in at least one embodiment herein. Therefore, the phrases "in an embodiment" or "in one embodiment" or "some embodiments" appearing throughout this specification do not necessarily refer to the same embodiment. In addition, in one or more embodiments, specific features, structures, functions, or characteristics may be combined in any suitable manner. For example, the first embodiment may be combined with the second embodiment in any case where the specific features, structures, functions, or characteristics associated with the two embodiments are not mutually exclusive.
[0018] As used in the description and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
[0019] The terms "coupled" and "connected," along with their derivatives, may be used herein to describe functional or structural relationships between components. It should be understood that these terms are not intended to be synonymous with each other. On the contrary, in certain embodiments, "connected" may be used to indicate that two or more elements are in direct physical, optical, or electrical contact with each other. "Coupled" may be used to indicate that two or more elements are in direct or indirect (with other intermediate elements between them) physical or electrical contact with each other, and / or that two or more elements collaborate or interact with each other (e.g., as in a cause-and-effect relationship).
[0020] As used throughout this description and in the claims, a list of items linked by the term "at least one of" or "one or more of" may mean any combination of the listed items. For example, the phrase "at least one of A, B, or C" may mean A; B; C; A and B; A and C; B and C; or A, B, and C.
[0021] The term "circuit" or "module" may refer to one or more passive and / or active components that are arranged to cooperate with each other to provide a desired functionality. The term "signal" may refer to at least one current, voltage, or magnetic signal. The terms "substantially," "close," "approximately," "close to," and "approximately" generally refer to within + / - 10% of a target value.
[0022] See also Figure 1Noise suppression is usually achieved through the USM mode inside the chip. When the chip enables the USM mode, the chip will work at a fixed frequency above the highest frequency that the human ear can hear, thus avoiding the generation of audio noise.
[0023] However, maintaining the chip's operating frequency above this threshold results in higher power consumption at light loads. Furthermore, only a small number of chips have the ability to increase the frequency, and these are mostly found in high-current (greater than 6A) DC-DC (direct current-to-direct current) power supplies.
[0024] If the chip needs to operate in a light load scenario (including zero load or load that varies periodically but is light load), the chip's operating frequency is below this frequency and the human ear can still hear audio noise.
[0025] |For the above reasons, see Figure 2 , an embodiment of the present disclosure provides an audio noise suppression circuit, comprising:
[0026] The microprocessor MCU interface is used to output a first control signal CTR1 and a second control signal CTR2 when the chip is powered on and the switching circuit of the chip starts to work.
[0027] The adjustable load module Rj is used to receive the first control signal CTR1 and the second control signal CTR2, and adjust the load value of the adjustable load module Rj to a fixed value or a random jump value under the control of the first control signal CTR1 and the second control signal CTR2.
[0028] |The following is an example of a common DC-DC power supply step-down conversion circuit (the same applies to the step-up conversion circuit, which will not be described in detail).
[0029] The DC-DC power supply step-down converter circuit includes an input voltage Vin and an output voltage Vo. The chip's switching circuit is connected to the input voltage Vin and includes: a first switching element, a first end of the first switching element connected to the input voltage Vin, and a second end connected to the output voltage Vo via an inductor L; and a second switching element, a first end of the second switching element connected to the second end of the first switching element, and a second end of the second switching element connected to ground. The first and second switching elements alternately switch on and off to control the charging and discharging of the inductor L.
[0030] Specifically, the first switching element is a first field effect transistor Q1, the second switching element is a second field effect transistor Q2, the drain of the first field effect transistor Q1 is connected to the input voltage, the source of the first field effect transistor Q1 is connected to the drain of the second field effect transistor Q2, the source of the second field effect transistor Q2 is connected to the first end of the inductor L, and the second end of the inductor L is respectively connected to the output voltage Vo and the first connection end of the adjustable load module Rj.
[0031] The first connection terminal of the adjustable load module Rj is connected to the output voltage Vo and the inductor L, respectively. The second connection terminal of the adjustable load module Rj is grounded via a third switching element. A first control signal CTR1 is connected to the control terminal of the third switching element. When the chip's operating frequency is below the highest frequency of audible noise to the human ear, the third switching element is controlled to direct the load value of the adjustable load module Rj into the audio noise suppression circuit. A second control signal CTR2 is connected to the adjustment terminal of the adjustable load module Rj to adjust the load value of the adjustable load module Rj. For example, the highest frequency of audible noise to the human ear is 25 kHz.
[0032] Specifically, the third switch element is a third field effect transistor Q3, the first control signal CTR1 is connected to the gate of the third field effect transistor Q3, the drain of the third field effect transistor Q3 is connected to the second connection end of the adjustable load module Rj, and the source of the third field effect transistor Q3 is grounded.
[0033] When the chip is powered on and the first and second field-effect transistors Q1 and Q2 begin operating, they output a first control signal CTR1 and a second control signal CTR2. When the chip operates under light load, its operating frequency is below the highest frequency audible to the human ear, making it susceptible to generating audible noise. Under the control of the first control signal CTR1, the load value of the adjustable load module Rj is fed into the audible noise suppression circuit. Under the control of the second control signal CTR2, the adjustable load module Rj is adjusted to a fixed value or a randomly varying value. If the adjustable load module Rj is fixed, it is equivalent to adding a load of Vo / Rj (where Vo is the output voltage), ensuring that the circuit's operating frequency is above the highest frequency audible to the human ear. If the adjustable load module Rj is randomly varying, the load is not fixed and randomly varies, ensuring that even if the chip's operating frequency is below the highest frequency audible to the human ear, audible noise will not be generated at the fixed frequency.
[0034] Therefore, the embodiments of the present disclosure can reduce the audio noise of the consumer electronic products in which they are used, without requiring the chip to operate above the highest frequency of noise that can be heard by the human ear, thereby reducing power consumption, being adaptable to light load scenarios, and improving the user experience of the consumer electronic products in which they are used.
[0035] In some specific implementations of the embodiments of the present disclosure, the adjustable load module is an adjustable current source or an adjustable variable resistor.
[0036] |The adjustable current source adjusts the load value to a fixed value or a random jump value by adjusting the injected current. The adjustable variable resistor adjusts the load value to a fixed value or a random jump value by adjusting the injected current and resistance.
[0037] In other specific implementations of the present disclosure, see Figure 3 , the audio noise suppression circuit further comprising:
[0038] The switching frequency detection module is used to collect the switching frequency Fs of the switching circuit of the chip.
[0039] The output load acquisition module is used to collect the load value between the input voltage and the output voltage.
[0040] If the switching frequency is less than or equal to the highest frequency of noise audible to the human ear, and the load value between the input voltage Vin and the output voltage Vo is a fixed value, the first control signal CTR1 and the second control signal CTR2 are output; otherwise, the first control signal CTR1 and the second control signal CTR2 are stopped from being output.
[0041] Specifically, the output load acquisition module includes:
[0042] a resistor R, wherein a first end of the resistor R is connected to a second end of the inductor L, a first end of the inductor L is connected to an input voltage Vin, and a second end of the resistor R is connected to an output voltage Vo;
[0043] The microprocessor MCU obtains the load value on the resistor R as the load value between the input voltage Vin and the output voltage Vo by respectively sensing the current between the first end and the second end of the resistor R.
[0044] The embodiment of the present disclosure controls the output of the first control signal CTR1 and the second control signal CTR2 through a switching frequency detection module and an output load acquisition module, turning on the audio noise suppression circuit when it is needed and turning off the audio noise suppression circuit when it is not needed, thereby greatly reducing losses.
[0045] | Corresponding to the above circuit, the embodiment of the present disclosure also provides an audio noise suppression method, see Figure 4 , the method comprising:
[0046] Step S1: When the chip is powered on and the switch circuit of the chip starts to work, a first control signal and a second control signal are output;
[0047] |Step S2: Under the control of the first control signal and the second control signal, adjust the load value of the adjustable load module to a fixed value or a random jump value.
[0048] Therefore, the embodiments of the present disclosure can reduce the audio noise of the consumer electronic products in which they are used, without requiring the chip to operate above the highest frequency of noise that can be heard by the human ear, thereby reducing power consumption, being adaptable to light load scenarios, and improving the user experience of the consumer electronic products in which they are used.
[0049] In some specific implementations of the embodiments of the present disclosure, step S1 further includes:
[0050] If the switching frequency of the chip's switching circuit is less than or equal to the highest frequency of noise audible to the human ear, and the load value between the input voltage and the output voltage is a fixed value, the first control signal and the second control signal are output; otherwise, the first control signal and the second control signal are stopped from being output.
[0051] The embodiment of the present disclosure controls the output of the first control signal CTR1 and the second control signal CTR2 to turn on the audio noise suppression circuit when it is needed and turn off the audio noise suppression circuit when it is not needed, which can greatly reduce the loss.
[0052] In some specific implementations of the present disclosure, see Figure 5 , step S2, and then further comprising:
[0053] Step S3: If the load value of the adjustable load module is adjusted to a fixed value and the switching frequency of the chip's switching circuit is less than or equal to the highest frequency of noise audible to the human ear, increase the load value of the adjustable load module until the switching frequency of the chip's switching circuit is greater than the highest frequency of noise audible to the human ear.
[0054] The embodiment of the present disclosure can further reduce possible audio noise by increasing the load value of the adjustable load module until the switching frequency of the chip's switching circuit is greater than the highest frequency of noise audible to the human ear.
[0055] The present disclosure also provides an electronic device, comprising: the above-mentioned audio noise suppression circuit and a chip connected to the audio noise suppression circuit.
[0056] Those skilled in the art will appreciate that the units and method steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure.
[0057] The present invention is described in detail but is not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the present invention. The scope of patent protection of the present invention shall be defined by the claims.
Claims
1. An audio noise suppression circuit, characterized in that: include: A microprocessor interface, used to output a first control signal and a second control signal when the chip is powered on and the switch circuit of the chip starts to work; and, The adjustable load module is used to receive the first control signal and the second control signal, and adjust the load value of the adjustable load module to a fixed value or a random jump value under the control of the first control signal and the second control signal.
2. The circuit according to claim 1, characterized in that The adjustable load module is an adjustable current source or an adjustable variable resistor.
3. The circuit according to claim 2, characterized in that The first connection end of the adjustable load module is connected to the output voltage and the inductor respectively, the second connection end of the adjustable load module is grounded through the third switch element, and the first control signal is connected to the control end of the third switch element.
4. The circuit according to claim 3, characterized in that When the operating frequency of the chip is below the highest frequency of noise that can be heard by the human ear, the load value of the adjustable load module is introduced into the audio noise suppression circuit by controlling the third switch element, and the second control signal is connected to the adjustment end of the adjustable load module to adjust the load value of the adjustable load module.
5. The circuit according to claim 3, characterized in that The third switch element is a third field effect transistor, the first control signal is connected to the gate of the third field effect transistor, the drain of the third field effect transistor is connected to the second connection end of the adjustable load module, and the source of the third field effect transistor is grounded.
6. The circuit according to any one of claims 1 to 5, characterized in that: The audio noise suppression circuit further includes: A switching frequency detection module, used to collect the switching frequency of the switching circuit of the chip; and An output load acquisition module is used to acquire the load value between the input voltage and the output voltage; If the switching frequency is less than or equal to the highest frequency of noise audible to the human ear, and the load value between the input voltage and the output voltage is a fixed value, the first control signal and the second control signal are output; otherwise, the first control signal and the second control signal are stopped from being output.
7. The circuit according to claim 6, characterized in that The output load acquisition module comprises: a resistor, wherein a first end of the resistor is connected to a second end of the inductor, a first end of the inductor is connected to an input voltage, and a second end of the resistor is connected to an output voltage; The microprocessor obtains the load value on the resistor as the load value between the input voltage and the output voltage by respectively sensing the current between the first end and the second end of the resistor.
8. The circuit according to claim 1, characterized in that The switch circuit of the chip includes: A first switch element, wherein a first end of the first switch element is connected to an input voltage, and a second end of the first switch element is connected to an output voltage via an inductor; and a second switch element, wherein a first end of the second switch element is connected to a second end of the first switch element, and a second end of the second switch element is grounded; The first switch element and the second switch element are switched alternately to control the charging and discharging of the inductor.
9. The circuit according to claim 8, characterized in that The first switching element is a first field effect transistor, the second switching element is a second field effect transistor, the drain of the first field effect transistor is connected to the input voltage, the source of the first field effect transistor is connected to the drain of the second field effect transistor, the source of the second field effect transistor is connected to the first end of the inductor, and the second end of the inductor is respectively connected to the output voltage and the first connection end of the adjustable load module.
10. An audio noise suppression method, characterized in that: include: When the chip is powered on and the switch circuit of the chip starts to work, a first control signal and a second control signal are output; Under the control of the first control signal and the second control signal, the load value of the adjustable load module is adjusted to a fixed value or a random jump value.
11. The method according to claim 10, characterized in that When the chip is powered on and the switch circuit of the chip starts to work, the first control signal and the second control signal are output, and the method further includes: If the switching frequency of the switching circuit of the chip is less than or equal to the highest frequency of noise that can be heard by the human ear, and the load value between the input voltage and the output voltage is a fixed value, then the first control signal and the second control signal are output; otherwise, the output of the first control signal and the second control signal is stopped.
12. The method according to claim 11, characterized in that The step of adjusting the load value of the adjustable load module to a fixed value or a random jump value under the control of the first control signal and the second control signal further includes: If the load value of the adjustable load module is adjusted to a fixed value, and the switching frequency of the chip's switching circuit is less than or equal to the highest frequency of noise that can be heard by the human ear, increase the load value of the adjustable load module until the switching frequency of the chip's switching circuit is greater than the highest frequency of noise that can be heard by the human ear.
13. An electronic device comprising: The audio noise suppression circuit according to any one of claims 1 to 9 and a chip connected to the audio noise suppression circuit.