CN113286225B - Audio signal amplification method and device - Google Patents
Audio signal amplification method and device Download PDFInfo
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- CN113286225B CN113286225B CN202010104640.2A CN202010104640A CN113286225B CN 113286225 B CN113286225 B CN 113286225B CN 202010104640 A CN202010104640 A CN 202010104640A CN 113286225 B CN113286225 B CN 113286225B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The embodiment of the invention provides an audio signal amplification method and an audio signal amplification device, wherein the method comprises the following steps: acquiring dynamic voltage information of a battery and peak value information of power amplifier ripple voltage of a charge pump in real time; updating power amplifier power supply voltage peak value information according to the battery dynamic voltage information acquired in real time and the charge pump power amplifier ripple voltage peak value information; and amplifying the input original audio signal data according to the power amplifier power supply voltage peak value information. The method comprises the steps of obtaining dynamic voltage information of a battery of the mobile portable device through trial, dynamically updating power amplifier power supply voltage peak value information in real time, and adjusting the amplitude of audio signal output according to the power amplifier power supply voltage peak value information updated in real time, so that the audio signal is amplified to an amplification limit value allowed by the current voltage as far as possible on the premise of no distortion.
Description
Technical Field
The present invention relates to the field of audio technologies, and in particular, to an audio signal amplification method and apparatus.
Background
Along with the popularization and popularity of portable intelligent equipment, people have higher requirements on the audio playing effect of the portable equipment, and are limited by the cost of the equipment, and a plurality of portable intelligent equipment can use charge pump type power amplifiers.
However, the maximum amplification voltage of the charge pump type power amplifier changes with the change of the input voltage of the charge pump type power amplifier, and the output voltage of the battery of the portable intelligent device changes continuously in the using process of the portable intelligent device, so that audio signal distortion can be generated when the power supply voltage changes.
In the prior art, a mode of limiting amplification factor or limiting amplitude of an input audio signal is usually adopted to ensure that the audio signal does not exceed a power supply voltage of a power amplifier, but this mode can ensure that the audio signal is not distorted, but output of an audio link cannot be in an optimal state.
Therefore, how to better achieve the amplification of the audio signal has become an urgent problem to be solved in the industry.
Disclosure of Invention
An embodiment of the present invention provides an audio signal amplifying method and apparatus, so as to solve the technical problems in the background art mentioned above, or at least partially solve the technical problems in the background art mentioned above.
In a first aspect, an embodiment of the present invention provides an audio signal amplifying method, including:
acquiring dynamic voltage information of a battery and peak value information of power amplifier ripple voltage of a charge pump in real time;
updating power amplifier power supply voltage peak value information according to the battery dynamic voltage information acquired in real time and the charge pump power amplifier ripple voltage peak value information;
and amplifying the input original audio signal data according to the power amplifier power supply voltage peak value information.
More specifically, the step of updating the peak value information of the power supply voltage of the power amplifier according to the dynamic voltage information of the battery obtained in real time in combination with the peak value information of the ripple voltage of the power amplifier of the charge pump specifically includes:
acquiring a power amplifier voltage conversion coefficient, and acquiring power amplifier real-time voltage information according to the power amplifier voltage conversion coefficient and the battery dynamic voltage information acquired in real time;
and calculating the difference between the ripple voltage peak value information of the charge pump power amplifier and the real-time voltage information of the power amplifier so as to update the peak value information of the power supply voltage of the power amplifier.
More specifically, the step of amplifying the input original audio signal data according to the power amplifier power supply voltage peak information specifically includes:
if the product of the number of the original audio signals and the total gain coefficient of the system is larger than the peak value information of the power supply voltage of the power amplifier, obtaining amplification coefficient information according to the ratio of the peak value information of the power supply voltage of the power amplifier to the product of the number of the original audio signals and the total gain coefficient of the system;
and amplifying the original audio signal data according to the amplification factor information to obtain amplified audio signal data.
More specifically, after the step of obtaining amplified audio signal data, the method comprises:
and smoothing the amplified audio signal data to obtain an audio output signal.
More specifically, after the step of obtaining amplified audio signal data, the method further comprises:
smoothing the amplification factor information to obtain smooth amplification factor information;
and obtaining an audio output signal according to the product of the smooth amplification factor information and the original audio signal data.
In a second aspect, an embodiment of the present invention provides an audio signal amplifying apparatus, including:
the acquisition module is used for acquiring dynamic voltage information of the battery and peak value information of power amplifier ripple voltage of the charge pump in real time;
the calculation module is used for updating power amplifier power supply voltage peak value information according to the battery dynamic voltage information acquired in real time and the charge pump power amplifier ripple voltage peak value information;
and the amplifying module is used for amplifying the input original audio signal data according to the power amplifier power supply voltage peak value information.
In a third aspect, an embodiment of the present invention provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the steps of the audio signal amplification method according to the first aspect are implemented.
In a fourth aspect, an embodiment of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the audio signal amplification method according to the first aspect.
According to the audio signal amplification method and device provided by the embodiment of the invention, the dynamic voltage information of the battery of the mobile portable device is obtained through trial test, so that the peak value information of the power supply voltage of the power amplifier is dynamically updated in real time, and the amplitude of the audio signal output is adjusted according to the power supply voltage peak value information of the power amplifier updated in real time, so that the audio signal is amplified to the amplification limit value allowed by the current voltage as far as possible on the premise of no distortion.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a flowchart illustrating an audio signal amplifying method according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an audio signal amplifying apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an electronic device according to an embodiment of the invention
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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, but 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 flow chart of an audio signal amplifying method according to an embodiment of the present invention, as shown in fig. 1, including:
the method comprises the following steps that S1, dynamic voltage information of a battery and peak value information of power amplifier ripple voltage of a charge pump are obtained in real time;
step S2, updating power amplifier power supply voltage peak value information according to the battery dynamic voltage information acquired in real time and the charge pump power amplifier ripple voltage peak value information;
and S3, amplifying the input original audio signal data according to the power amplifier power supply voltage peak value information.
Specifically, the battery dynamic voltage information described in the embodiment of the present invention refers to current-time voltage information obtained by the portable intelligent device in real time, and the battery dynamic voltage information may be directly obtained through system hardware.
The peak value information of the power amplifier ripple voltage of the charge pump can be obtained through a test or a chip manual.
Updating power amplifier power supply voltage peak value information according to battery dynamic voltage information Vdd and charge pump power amplifier ripple voltage peak value information Vrip acquired in real time specifically means that:
PVdd＝Vdd×k-Vrip
and k is a power amplifier voltage conversion coefficient of the portable intelligent equipment.
The embodiment of the invention specifically refers to that according to the power amplifier power supply voltage peak value information updated in real time, the magnitude of the product of original audio signal data and a system total gain coefficient and the magnitude of the power amplifier power supply voltage peak value information are judged firstly, if the product of the original audio signal data and the system total gain coefficient is larger than the power amplifier power supply voltage peak value information, amplification coefficient information is obtained through the ratio of the power amplifier power supply voltage peak value information to the product of the original audio signal number and the system total gain coefficient, and the original audio signal is amplified according to the amplification coefficient to obtain the amplified audio signal data.
And if the product of the original audio signal data and the total gain coefficient of the system is less than or equal to the peak value information of the power supply voltage of the power amplifier, directly outputting the original audio signal data.
The embodiment of the invention obtains the battery dynamic voltage information of the mobile portable equipment through trial test, thereby dynamically updating the power amplifier power supply voltage peak value information in real time, and adjusting the amplitude of the audio signal output according to the power amplifier power supply voltage peak value information updated in real time, so that the audio signal is amplified to the amplification limit value allowed by the current voltage as far as possible on the premise of no distortion.
On the basis of the above embodiment, the step of updating the peak value information of the power supply voltage of the power amplifier according to the dynamic voltage information of the battery obtained in real time in combination with the peak value information of the ripple voltage of the power amplifier of the charge pump specifically includes:
acquiring a power amplifier voltage conversion coefficient, and acquiring power amplifier real-time voltage information according to the power amplifier voltage conversion coefficient and the battery dynamic voltage information acquired in real time;
and calculating the difference between the ripple voltage peak value information of the charge pump power amplifier and the real-time voltage information of the power amplifier so as to update the peak value information of the power supply voltage of the power amplifier.
Specifically, the power amplifier voltage conversion coefficient described in the embodiment of the present invention refers to a coefficient for converting battery dynamic voltage information into power amplifier voltage, and the coefficient may be predetermined by platform hardware.
And obtaining power amplifier real-time voltage information, namely Vdd multiplied by k, according to the product of the power amplifier voltage conversion coefficient and the battery dynamic voltage information acquired in real time.
The updating of the peak value information of the power supply voltage of the power amplifier described in the embodiment of the invention specifically means that:
PVdd＝Vdd×k-Vrip
wherein, vrip is the peak value information of the power amplifier ripple voltage of the charge pump.
When the real-time voltage of the power amplifier can be directly obtained, the peak value information of the ripple voltage of the power amplifier of the charge pump can be directly subtracted from the power supply voltage value of the power amplifier obtained by the platform to obtain the peak value information of the power supply voltage of the power amplifier.
The embodiment of the invention can dynamically update the peak value information of the power supply voltage of the power amplifier according to the dynamic voltage information of the battery acquired in real time, and is more favorable for adjusting the amplitude of the output of the audio signal, so that the audio signal is amplified to the amplification limit value allowed by the current voltage as far as possible on the premise of no distortion.
On the basis of the above embodiment, the step of amplifying the input original audio signal data according to the power amplifier supply voltage peak information specifically includes:
if the product of the number of the original audio signals and the total gain coefficient of the system is larger than the peak value information of the power supply voltage of the power amplifier, obtaining amplification coefficient information according to the ratio of the peak value information of the power supply voltage of the power amplifier to the product of the number of the original audio signals and the total gain coefficient of the system;
and amplifying the original audio signal data according to the amplification factor information to obtain amplified audio signal data.
Specifically, if the product (S1 × ratio) of the original audio signal data and the total system Gain coefficient is less than or equal to the power amplifier supply peak value information PVdd, then PVdd ÷ (S1 × ratio) is greater than 1, and then the amplification coefficient information Gain =1;
if the product of the number of the original audio signals and the total gain coefficient of the system is larger than the peak value information of the power supply voltage of the power amplifier, comparing the product of the number of the original audio signals and the total gain coefficient of the system with the peak value information of the power supply voltage of the power amplifier, and if the product of the number of the original audio signals and the total gain coefficient of the system is larger than the peak value information of the power supply voltage of the power amplifier, calculating the coefficient information of the method, specifically:
Gain＝PVdd÷(S1×ratio)
wherein, ratio is the system total increment coefficient.
After the smooth amplification factor information is determined, amplifying the original audio signal data according to the smooth amplification factor, which may specifically be:
if (S1 × ratio) is greater than PVdd, gain = (PVdd ÷ (S1 × ratio))
S2＝S1×(PVdd÷(S1×ratio))；
If (S1 × ratio) is equal to or less than PVdd, gain =1
S2＝S1×1；
Wherein, S2 is amplified audio signal data, S1 is original audio signal data, ratio is a system total gain coefficient, and PVdd is power amplifier supply voltage peak value information.
On the basis of the above embodiment, after the step of obtaining amplified audio signal data, the method includes:
and smoothing the amplified audio signal data to obtain an audio output signal.
Specifically, the smoothing processing described in the embodiment of the present invention specifically includes averaging, averaging in a sliding window, or using a filter.
On the basis of the above embodiment, after the step of obtaining amplified audio signal data, the method further includes:
smoothing the amplification factor information to obtain smooth amplification factor information;
and obtaining an audio output signal according to the product of the smooth amplification factor information and the original audio signal data.
Specifically, the smoothing processing described in the embodiment of the present invention may be applied to the amplified audio signal data, and may also be applied to smooth the amplification factor information.
That is, gain = (PVdd ÷ (S1 × ratio)), then S2= S1 × gain, and then smoothing the gain may be equivalent to smoothing S2.
Fig. 2 is a schematic structural diagram of an audio signal amplifying apparatus according to an embodiment of the present invention, as shown in fig. 2, including: an acquisition module 210, a calculation module 220 and an amplification module 230; the obtaining module 210 is configured to obtain dynamic voltage information of the battery and peak voltage information of a power amplifier ripple of the charge pump in real time; the calculation module 220 is configured to update power amplifier supply voltage peak value information according to the battery dynamic voltage information obtained in real time in combination with the charge pump power amplifier ripple voltage peak value information; the amplifying module 230 is configured to amplify the input original audio signal data according to the peak information of the power supply voltage of the power amplifier.
On the basis of the foregoing embodiment, the calculation module is specifically configured to:
acquiring a power amplifier voltage conversion coefficient, and acquiring power amplifier real-time voltage information according to the power amplifier voltage conversion coefficient and the battery dynamic voltage information acquired in real time;
and calculating the difference between the ripple voltage peak value information of the charge pump power amplifier and the real-time voltage information of the power amplifier so as to update the peak value information of the power supply voltage of the power amplifier.
On the basis of the foregoing embodiment, the amplification module is specifically configured to:
if the product of the number of the original audio signals and the total gain coefficient of the system is larger than the peak value information of the power supply voltage of the power amplifier, obtaining amplification coefficient information according to the ratio of the peak value information of the power supply voltage of the power amplifier to the product of the number of the original audio signals and the total gain coefficient of the system;
and amplifying the original audio signal data according to the amplification factor information to obtain amplified audio signal data.
The apparatus provided in the embodiment of the present invention is used for executing the above method embodiments, and for details of the process and the details, reference is made to the above embodiments, which are not described herein again.
The embodiment of the invention obtains the battery dynamic voltage information of the mobile portable equipment through trial test, thereby dynamically updating the power amplifier power supply voltage peak value information in real time, and adjusting the amplitude of the audio signal output according to the power amplifier power supply voltage peak value information updated in real time, so that the audio signal is amplified to the amplification limit value allowed by the current voltage as far as possible on the premise of no distortion.
Fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 3, the electronic device may include: a processor (processor) 310, a communication Interface (Communications Interface) 320, a memory (memory) 330 and a communication bus 340, wherein the processor 310, the communication Interface 320 and the memory 330 communicate with each other via the communication bus 340. The processor 310 may call logic instructions in the memory 330 to perform the following method: acquiring dynamic voltage information of a battery and peak value information of power amplifier ripple voltage of a charge pump in real time; updating power amplifier power supply voltage peak value information according to the battery dynamic voltage information acquired in real time and the charge pump power amplifier ripple voltage peak value information; and amplifying the input original audio signal data according to the power amplifier power supply voltage peak value information.
In addition, the logic instructions in the memory 330 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention or a part thereof which substantially contributes to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.
An embodiment of the present invention discloses a computer program product, which includes a computer program stored on a non-transitory computer readable storage medium, the computer program including program instructions, when the program instructions are executed by a computer, the computer can execute the methods provided by the above method embodiments, for example, the method includes: acquiring dynamic voltage information of a battery and peak value information of power amplifier ripple voltage of a charge pump in real time; updating power amplifier power supply voltage peak value information according to the battery dynamic voltage information acquired in real time and the charge pump power amplifier ripple voltage peak value information; and amplifying the input original audio signal data according to the power amplifier power supply voltage peak value information.
Embodiments of the present invention provide a non-transitory computer-readable storage medium storing server instructions, where the server instructions cause a computer to execute the method provided in the foregoing embodiments, for example, the method includes: acquiring dynamic voltage information of a battery and peak value information of power amplifier ripple voltage of a charge pump in real time; updating power amplifier power supply voltage peak value information according to the battery dynamic voltage information acquired in real time and the charge pump power amplifier ripple voltage peak value information; and amplifying the input original audio signal data according to the power amplifier power supply voltage peak value information.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. Based on the understanding, the above technical solutions substantially or otherwise contributing to the prior art may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the various embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method of amplifying an audio signal, comprising:
acquiring dynamic voltage information of a battery and peak value information of power amplifier ripple voltage of a charge pump in real time;
updating power amplifier power supply voltage peak value information according to the battery dynamic voltage information acquired in real time and the charge pump power amplifier ripple voltage peak value information;
amplifying the input original audio signal data according to the power amplifier power supply voltage peak value information; the product of the original audio signal data and the total gain coefficient of the system is smaller than or equal to the peak value information of the power supply voltage of the power amplifier.
2. The audio signal amplification method of claim 1, wherein the step of updating the peak value information of the power supply voltage of the power amplifier according to the dynamic voltage information of the battery obtained in real time in combination with the peak value information of the ripple voltage of the power amplifier of the charge pump specifically comprises:
acquiring a power amplifier voltage conversion coefficient, and acquiring power amplifier real-time voltage information according to the power amplifier voltage conversion coefficient and the battery dynamic voltage information acquired in real time;
and performing difference calculation on the ripple voltage peak value information of the charge pump power amplifier and the real-time voltage information of the power amplifier to update the peak value information of the power supply voltage of the power amplifier.
3. The audio signal amplification method of claim 1, wherein the step of amplifying the input original audio signal data according to the power amplifier supply voltage peak information specifically comprises:
if the product of the number of the original audio signals and the total gain coefficient of the system is larger than the peak value information of the power supply voltage of the power amplifier, obtaining amplification coefficient information according to the ratio of the peak value information of the power supply voltage of the power amplifier to the product of the number of the original audio signals and the total gain coefficient of the system;
and amplifying the original audio signal data according to the amplification factor information to obtain amplified audio signal data.
4. The audio signal amplification method of claim 3, wherein the step of obtaining amplified audio signal data is followed by the method comprising:
and smoothing the amplified audio signal data to obtain an audio output signal.
5. The audio signal amplification method of claim 4, wherein after the step of obtaining the amplified audio signal data, the method further comprises:
smoothing the amplification factor information to obtain smooth amplification factor information;
and obtaining an audio output signal according to the product of the smooth amplification factor information and the original audio signal data.
6. An audio signal amplifying apparatus, comprising:
the acquisition module is used for acquiring dynamic voltage information of the battery and peak value information of power amplifier ripple voltage of the charge pump in real time;
the calculation module is used for updating power amplifier power supply voltage peak value information according to the battery dynamic voltage information acquired in real time and the charge pump power amplifier ripple voltage peak value information;
the amplifying module is used for amplifying the input original audio signal data according to the power amplifier power supply voltage peak value information; and the product of the original audio signal data and the total gain coefficient of the system is smaller than or equal to the peak value information of the power supply voltage of the power amplifier.
7. The audio signal amplification device of claim 6, wherein the calculation module is specifically configured to:
acquiring a power amplifier voltage conversion coefficient, and acquiring power amplifier real-time voltage information according to the power amplifier voltage conversion coefficient and the battery dynamic voltage information acquired in real time;
and performing difference calculation on the ripple voltage peak value information of the charge pump power amplifier and the real-time voltage information of the power amplifier to update the peak value information of the power supply voltage of the power amplifier.
8. The audio signal amplification device of claim 6, wherein the amplification module is specifically configured to:
if the product of the number of the original audio signals and the total gain coefficient of the system is larger than the peak value information of the power supply voltage of the power amplifier, obtaining amplification coefficient information according to the ratio of the peak value information of the power supply voltage of the power amplifier to the product of the number of the original audio signals and the total gain coefficient of the system;
and amplifying the original audio signal data according to the amplification factor information to obtain amplified audio signal data.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor when executing the program carries out the steps of the audio signal amplification method according to any one of claims 1 to 5.
10. A non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the audio signal amplification method according to any one of claims 1 to 5.
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| US7733178B1 (en) * | 2007-10-24 | 2010-06-08 | Fairchild Semiconductor Corporation | High efficiency audio amplifier |
| US9634621B1 (en) * | 2013-09-24 | 2017-04-25 | Cirrus Logic, Inc. | Charge-pump power supply with voltage-headroom-dependent supply voltage |
| CN204859530U (en) * | 2015-07-30 | 2015-12-09 | 宁波大红鹰学院 | Multimode audio power amplifier |
| US10114392B2 (en) * | 2016-11-03 | 2018-10-30 | Cirrus Logic, Inc. | Variable ratio charge pump with peak current and average current limiting circuitry |
| CN106656065A (en) * | 2016-11-16 | 2017-05-10 | 上海艾为电子技术股份有限公司 | Audio power amplifier and audio device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103477557A (en) * | 2010-12-09 | 2013-12-25 | 射频小型装置公司 | Pseudo-envelope follower power management system with high frequency ripple current compensation |
| CN107453722A (en) * | 2017-06-12 | 2017-12-08 | 合肥市汤诚集成电路设计有限公司 | Charge pump is adaptively boosted F class power amplifiers |
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