CN111556408B - Intelligent power control system of loudspeaker and control method thereof - Google Patents
Intelligent power control system of loudspeaker and control method thereof Download PDFInfo
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- CN111556408B CN111556408B CN202010371677.1A CN202010371677A CN111556408B CN 111556408 B CN111556408 B CN 111556408B CN 202010371677 A CN202010371677 A CN 202010371677A CN 111556408 B CN111556408 B CN 111556408B
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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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
- H03G11/008—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general of digital or coded signals
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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
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/01—Aspects of volume control, not necessarily automatic, in sound systems
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Abstract
The intelligent loudspeaker power control system includes hardware circuit unit and platform calculator connected electrically to the hardware circuit unit. And the platform calculator block judges that in a given interval delay, if the continuous delay of the peak power of the equivalent power value is greater than or equal to a delay threshold, the amplitude of the waveform of the input signal to be output to the hardware circuit unit is limited and controlled within the amplitude of the signal waveform corresponding to the rated power. The hardware circuit unit comprises a feedforward processing component, a waveform adder, a power amplifier and a loudspeaker which are connected in sequence, wherein the feedforward processing component judges whether a signal gain value needs to be adjusted or not and outputs the adjusted signal gain value to the waveform adder. And the intelligent power control method of the loudspeaker can intelligently and ideally control the output quality of the audio signal so as to avoid the signal clipping phenomenon and the signal distortion.
Description
Technical Field
The invention relates to the technical field of loudspeakers, in particular to an intelligent power control system suitable for a loudspeaker and a control method thereof.
Background
Mobile phone speakers and other miniature speakers often exhibit a large amount of distortion that limits the maximum volume of audio that the speaker can reproduce for a user in a comfortable manner. For example, when the Total Harmonic Distortion (THD) reaches a frequency in the range of the peak power (i.e., exhibits a local maximum) to overdrive the speaker, the output of any speaker suffers from distortion.
The intelligent power amplifier chip is a hardware circuit of the loudspeaker, and the power control calculation of the loudspeaker is realized by adjusting the output gain in real time according to the amplitude of the output signal through the hardware circuit. The existing intelligent power amplifier chip can check whether the signal has clipping phenomenon (clipping) while amplifying the input signal, and the clipping phenomenon is indicated at the position of a dotted circle shown in fig. 1; or checking whether the signal exceeds the rated power, and further dynamically adjusting the signal gain to avoid the loudspeaker from being damaged due to the fact that the signal exceeds the range and the tone quality is poor or the rated power of the loudspeaker is exceeded for a long time.
The automatic gain control (agc) is the most important loop for realizing dynamic gain control, and the general analog realization method is to detect the amplitude of an output signal, compare the amplitude with a threshold level, carry out amplitude limiting processing if the amplitude exceeds the threshold level, but if the clipping phenomenon repeatedly occurs, the tone quality becomes worse, so that the response time of the automatic gain control is required to be fast enough, but near the rated power, the response is not required to be too fast, otherwise, the tone quality and the auditory perception are influenced, therefore, the frequency of the automatic gain control is difficult to be held, and the signal clipping phenomenon and the signal distortion of different degrees inevitably occur.
The background section is only used for illustrating the invention, and therefore the disclosure in the background section may include some known technologies which are not known to those of ordinary skill in the art. The statements in the "background" section do not represent that matter or the problems which may be solved by one or more embodiments of the present invention, but are known or appreciated by those skilled in the art before filing the present application.
Disclosure of Invention
In order to solve the above problems, an objective of the present invention is to provide an intelligent power control system for a speaker, which is implemented by calculating a hardware circuit with a platform calculator, so as to meet a requirement that a continuous delay of a rated power of the speaker can be adjusted.
Another objective of the present invention is to provide an intelligent power control method for a speaker, which performs amplitude limiting processing on a signal and adjusts the signal gain in real time according to the amplitude of the signal waveform, so as to intelligently and ideally control the output quality of an audio signal, and avoid signal clipping and signal distortion.
In summary, the present invention discloses an intelligent power control system for a speaker, which includes a hardware circuit unit, and a platform calculator electrically connected to the hardware circuit unit, wherein the platform calculator includes a filtering detection module, a power calculation module, and an amplitude limiting control module, wherein the filtering detection module filters noise of an input signal, performs envelope tracking on the filtered signal to obtain a signal envelope value, and outputs the signal envelope value to the power calculation module. The power calculation module calculates an equivalent power value according to the signal envelope value and outputs the equivalent power value to the amplitude limiting control module. And the amplitude limiting control module judges that in the given interval delay, if the continuous delay of the peak power of the equivalent power value is greater than or equal to the delay threshold, the amplitude limiting control is carried out on the waveform of the input signal to be output to the hardware circuit unit to obtain an amplitude limiting signal, so that the waveform of the amplitude limiting signal is controlled within the signal waveform amplitude corresponding to the rated power. The hardware circuit unit comprises a feedforward processing component, a waveform adder, a power amplifier and a loudspeaker which are connected in sequence, wherein the feedforward processing component comprises a tracking detection module and a gain control module which is electrically connected with the waveform adder which are connected in sequence, the tracking detection module receives the amplitude limiting signal transmitted by the amplitude limiting control module of the platform calculator, the amplitude limiting signal is tracked and calculated to obtain a signal detection value, and the signal detection value is output to the gain control module. And the gain control module judges whether the signal gain value needs to be adjusted or not according to the signal detection value and outputs the adjusted signal gain value to the waveform adder.
The invention also discloses a loudspeaker intelligent power control method for the loudspeaker intelligent power control system, the loudspeaker intelligent power control system comprises a hardware circuit unit and a platform calculator electrically connected with the hardware circuit unit, the hardware circuit unit comprises a feedforward processing component, a waveform adder, a power amplifier and a loudspeaker which are sequentially connected, and the loudspeaker intelligent power control method comprises the steps of carrying out envelope tracking on an input signal through the platform calculator to obtain a signal envelope value; calculating an equivalent power value according to the signal envelope value; judging whether the time delay of the peak power of the equivalent power value is larger than or equal to a time delay threshold or not within a given interval time delay, and if the time delay of the peak power of the equivalent power value is larger than or equal to the time delay threshold, carrying out amplitude limiting control on the waveform of the input signal to be output to the hardware circuit unit to obtain an amplitude limiting signal, so that the waveform of the amplitude limiting signal is controlled within the signal waveform amplitude corresponding to the rated power; tracking and calculating the amplitude limiting signal through a feedforward processing part to obtain a signal detection value; judging whether the signal gain value needs to be adjusted or not according to the signal detection value, and outputting the adjusted signal gain value to a waveform adder in real time; performing addition operation according to the signal gain value through a waveform adder to form an added signal and outputting the added signal to a power amplifier; and amplifying the added signal by a power amplifier and outputting the amplified signal to a loudspeaker.
Drawings
FIG. 1 is a diagram of a waveform of an output signal with constant frequency AGC in the prior art;
FIG. 2 is a block diagram of an intelligent power control system for speakers according to the present invention;
FIG. 3 is a circuit diagram of the speaker intelligent power control system of the present invention;
FIG. 4 is a schematic diagram of the gain control module of the intelligent power control system for speakers according to the present invention;
FIG. 5 is a flow chart of a method for intelligent power control of a speaker according to the present invention;
fig. 6 is a schematic diagram of the waveform of the output signal of the intelligent power control system of the speaker according to the present invention.
Detailed Description
So that the manner in which the above recited features and advantages of the present invention can be understood and attained by a person skilled in the art, a more particular description of the invention, briefly summarized above, may be had by reference to the appended drawings, in which like reference characters refer to the same parts throughout the several views. The drawings referred to below are schematic representations relating to the features of the invention and are not necessarily drawn to scale. The description of the embodiments related to the present invention will not be repeated, except for those skilled in the art.
Referring to fig. 2, fig. 2 is a block diagram of an intelligent power control system for speakers according to the present invention. As shown in fig. 2, a hardware circuit unit 2 of a device capable of sending out an audio control signal, such as a mobile phone, a personal digital assistant (PAD), a notebook computer, etc., is electrically connected to a platform calculator 1, and the platform calculator 1 may be an application program (APP) installed in an intelligent playback device, and is used for performing amplitude limiting processing on a signal through an algorithm, so that the signal to be output to the hardware circuit unit 2 is not subjected to obvious clipping and distortion. The platform calculator 1 includes a filtering detection module 11, a power calculation module 12 and a clipping control module 10. The hardware circuit unit 2 may be an intelligent power amplifier chip disposed on a device capable of sending out an audio control signal, and the hardware circuit unit 2 includes a feedforward processing component 200, a waveform adder 20, a power amplifier 30 and a speaker 40, which are connected in sequence. A waveform adder 20 for adding the input signal and the signal gain value to form an added signal; the power amplifier 30 amplifies a gain of a signal to be input to the speaker 40; the speaker 40 is used for emitting audio signals; the feedforward processing section 200 is used to perform feedforward processing on the input signal based on preset filter coefficients and flexibly adjust the output gain to track the voltage change so as to eliminate the nonlinear distortion generated by the speaker 40.
Referring to fig. 3, fig. 3 is a circuit diagram of an intelligent power control system for a speaker according to the present invention. Before the signal in the hardware circuit unit 2 is input to the waveform adder 20 and the feedforward processing unit 200, the intelligent power amplifier chip-mounted platform calculator 1 is used to perform amplitude limiting processing on the input signal, and the purpose of the amplitude limiting processing is to completely avoid signal clipping and reduce distortion after signal processing as much as possible by calculating the time delay of a buffer area and the power of an amplitude limiting control signal. Therefore, the circuit in the platform calculator 1 is designed to couple the amplitude limiting control module 10 with the filtering detection module 11 and the power calculation module 12 in a feedforward manner; the filtering detection module 11 is used for filtering noise of the signal and detecting and tracking the signal; the power calculation module 12 is used for calculating a power value equivalent to the actual output of the loudspeaker 40 through algorithm simulation; the amplitude limiting control module 10 is configured to limit a signal to be output within an amplitude corresponding to a rated power. The filter detection module 11 first filters the input signal to obtain a filtered digital signal based on filter coefficients arranged to remove non-linear components of each parameter of the loudspeaker 40, and thus non-linear distortions. After filtering noise introduced by the platform operator 1, the filtering detection module 11 performs envelope tracking on the filtered digital signal to obtain a signal envelope value corresponding to a tracking result, and outputs the signal envelope value to the power operation module 12.
The power calculation module 12 calculates an equivalent power value through an algorithm according to the signal envelope value, and outputs a plurality of equivalent power values to the amplitude limiting control module 10. Wherein the algorithm of the equivalent power value is based on real timeEach signal envelope value of (a) calculates a root mean square value XrmsRoot mean square value XrmsCan be used as the basis for simulating the actual output power value of the loudspeaker 40, so that the root mean square value XrmsMay represent an equivalent power value. For example, the algorithm may be an algorithm that performs the following formula (1) to obtain the root mean square value Xrms。
Wherein, XiIs the signal envelope value received from the filter detection module 11, for which a total of N signal envelope values, i.e. X, are received for different time delays1、X2、X3、…、XNAnd N signal envelope values.
The amplitude limiting control module 10 records the continuous time delay of the rated power and the continuous time delay of the peak power for the signal in real time. Rated power means that the speaker 40 can be used for a long time without damage in this power state. Peak power refers to the maximum strong pulse that the speaker 40 can withstand within a 10 millisecond delay. The peak power is usually 8 to 10 times the rated power, and since the speaker 40 is limited in the withstand time delay set to 1 second, the speaker 4 can withstand the peak power at most 10 times, and if it exceeds 10 times, the speaker 4 may be damaged. In order to avoid the damage of the loudspeaker 4 or the distortion of the output audio signal, the amplitude limiting control module 10 receives the equivalent power values of different time from the power calculation module 12, and then judges that the equivalent power values are within the given interval delay, if the continuous delay of the peak power of the equivalent power values is greater than or equal to the delay threshold, the amplitude limiting control is performed on the waveform of the input signal to be output to the hardware circuit unit 2 to obtain the amplitude limiting signal, so that the waveform of the amplitude limiting signal is controlled within the signal waveform amplitude corresponding to the rated power. In addition, the amplitude limiting control module 10 determines that if the continuous time delay of the peak power of the input signal is smaller than the time delay threshold, it is not necessary to perform amplitude limiting control on the waveform of the input signal, and the waveform is also output to the hardware circuit unit 2 in the form of an amplitude limiting signal, which is a digital signal value and can reach a quantization precision of 8 bits (bit). The delay threshold referred to herein is the delay experienced by the speaker 40 for peak power, which may be, for example, 1 second. That is, the clipping process is performed before the input signal is input to the hardware circuit unit 2 to reduce the risk of damage to the speaker 4 or distortion of the output audio signal.
Referring to fig. 3, the hardware circuit unit 2 receives the amplitude-limited signal after amplitude-limiting processing by the platform calculator 1, and the amplitude-limited signal is first subjected to automatic gain control by the feedforward processing unit 200 and the waveform adder 20 together. The feedforward processing component 200 includes a tracking detection module 220 and a gain control module 230 electrically connected to the waveform adder, which are connected in series. The tracking detection module 220 receives the amplitude limiting signal transmitted by the amplitude limiting control module 10 of the platform calculator 1, performs tracking calculation on the amplitude limiting signal to obtain a signal detection value, and outputs the signal detection value to the gain control module 230; the signal detection value is obtained by envelope detection through a digital algorithm, so that the signal amplitude change and the voltage value change of the hardware circuit unit 2 can be effectively tracked, unnecessary adjustment is reduced, and the signal quality is better maintained.
The gain control module 230 receives the signal detection value input from the tracking detection module 220, determines whether the signal gain value needs to be adjusted according to the signal detection value, and outputs the adjusted signal gain value to the waveform adder 20 in real time. The main means for adjusting the signal gain value is to determine whether a fast response is required, and select a fast clock (fast _ clock) as a main clock for gain control when a fast response is required, as shown in fig. 4; and when no fast response is required, the slow clock (slow _ clock) is selected as the main clock for gain control. In this embodiment, for example, two thresholds (threshold) are set, one of which is a clipping threshold (vth _ h) and the other is a rated power threshold (vth _ l), and a plurality of thresholds may also be set as needed. When the signal detection value is greater than vth _ h, the main clock of the gain control module 230 is switched to a fast clock, the signal amplitude is quickly attenuated to vth _ h, and the gain of the analog operational amplifier (the waveform adder 20) is updated at the signal zero crossing point; and when the signal amplitude is below vth _ h but greater than vth _ l, the main clock of the gain control module 230 switches to the slow clock, the gain attenuation amplitude slows down, and the signal gain value is adjusted to 0. When the signal output by the waveform adder 20 is smaller than the gain recovery threshold (vth _ rec, whose value is lower than the rated power threshold), the gain control module 230 enters the recovery time (release time), and the gain attenuation is slowly recovered, which not only meets the safe use specification, but also meets the requirement of sound quality, and can also reduce the power consumption. The clock switching method for switching the main clock of the gain control module 230 to the fast clock or the slow clock is well known to those skilled in the art and will not be described herein.
The waveform adder 20 receives the input signal and the signal gain value from the gain control module 230, the signal gain value represents the gain attenuation in case of fast clock or slow clock, so that the input signal and the signal gain value are processed by full addition to form an added signal and output to the power amplifier 30. The power amplifier 30 receives the added signal from the waveform adder 20, performs amplification processing, and outputs the amplified signal to the speaker 40. When there is a high voltage component which cannot be internally processed in the hardware circuit unit 2, the power amplifier 30 is provided immediately in front of the speaker 40, and the original signal distortion level can be improved by amplifying the parameters of the high voltage component by a gain factor, that is, so-called scaling processing for adjusting the magnitude of each parameter.
Referring to fig. 5, the process steps of the speaker intelligent power control method of the present invention will be described according to the speaker intelligent power control system of the present invention, wherein the speaker intelligent power control method of fig. 5 includes steps S10 to S70, and the platform calculator 1 performs steps S10 to S30:
step S10: carrying out envelope tracking on an input signal to obtain a signal envelope value; the filtering detection module 11 filters noise from the input signal, and filters noise introduced by the platform calculator 1 to obtain a filtered signal. And then, envelope tracking is performed on the filtered signal to obtain a signal envelope value corresponding to a tracking result, and the signal envelope value is output to the power operation module 12.
Step S20: calculating an equivalent power value through an algorithm according to the signal envelope value; the power calculation module 12 calculates the root mean square value representing the equivalent power value according to each real-time signal envelope value through the algorithm of the above equation (1). And then outputs the plurality of equivalent power values to the clipping control module 10.
Step S30: the amplitude limiting control module 10 judges whether to perform amplitude limiting control; namely, within a given interval delay, if the continuous delay of the peak power of the equivalent power value is greater than or equal to the delay threshold, the waveform of the input signal to be output to the hardware circuit unit 2 is subjected to amplitude limiting control to obtain an amplitude limiting signal, so that the waveform of the amplitude limiting signal is controlled within the signal waveform amplitude corresponding to the rated power; if the continuous time delay of the peak power of the input signal is smaller than the time delay threshold, the amplitude limiting signal to be output does not need to carry out amplitude limiting control on the waveform of the input signal.
Next, the hardware circuit unit 2 executes steps S40 to S80:
step S40: tracking and calculating the amplitude limiting signal to obtain a signal detection value; the tracking detection module 220 receives the amplitude limiting signal transmitted by the amplitude limiting control module 10 of the platform calculator 1, performs tracking calculation on the amplitude limiting signal to obtain a signal detection value, and outputs the signal detection value to the gain control module 230.
Step S50: the gain control module 230 determines whether the signal gain value needs to be adjusted according to the signal detection value, and outputs the adjusted signal gain value to the waveform adder 20 in real time; the main means for adjusting the signal gain value is to determine whether a fast response is required, and select a fast clock as a main clock for gain control when a fast response is required, as shown in fig. 4; and when a fast response is not required, the slow clock is selected as the master clock for gain control.
Step S60: form an added signal and output to the power amplifier 30; the added signal is formed by the full addition of the input signal received by the waveform adder 20 and the signal gain value from the gain control block 230.
Step S70: amplifying the added signal and outputting the amplified signal to the speaker 40; the power amplifier 30 receives the added signal from the waveform adder 20, amplifies the signal, and outputs the amplified signal to the speaker 40, thereby improving the level of signal distortion.
Preferably, after the variable frequency automatic gain control is adopted, the waveform of the signal output to the loudspeaker 40 is as shown in fig. 6, the clipping phenomenon is obviously not seen, and the signal distortion is reduced; the signal quality can be effectively improved, and the tone quality is stable.
The description is intended to be illustrative, and not restrictive. It is intended that all equivalent modifications or variations without departing from the spirit and scope of the present invention shall be included in the appended claims.
Claims (10)
1. The utility model provides a speaker intelligence power control system, its characterized in that, including hardware circuit unit, with hardware circuit unit electric connection's platform calculator, the platform calculator includes filtering detection module, power calculation module and amplitude limiting control module, wherein:
the filtering detection module filters noise of an input signal, carries out envelope tracking on the filtered signal to obtain a signal envelope value, and outputs the signal envelope value to the power calculation module;
the power calculation module calculates an equivalent power value according to the signal envelope value and outputs the equivalent power value to the amplitude limiting control module;
the amplitude limiting control module judges that in a given interval time delay, if the continuous time delay of the peak power of the equivalent power value is greater than or equal to a time delay threshold, the amplitude limiting control is carried out on the waveform of the input signal to be output to the hardware circuit unit to obtain an amplitude limiting signal, and the waveform of the amplitude limiting signal is controlled within the signal waveform amplitude corresponding to the rated power;
the hardware circuit unit comprises a feedforward processing component, a waveform adder, a power amplifier and a loudspeaker which are connected in sequence, wherein the feedforward processing component comprises a tracking detection module and a gain control module which is electrically connected with the waveform adder, which are connected in sequence, and the hardware circuit unit comprises:
the tracking detection module receives the amplitude limiting signal transmitted by the amplitude limiting control module of the platform calculator, performs tracking calculation on the amplitude limiting signal to obtain a signal detection value, and outputs the signal detection value to the gain control module;
the gain control module judges whether a signal gain value needs to be adjusted or not according to the signal detection value, outputs the adjusted signal gain value to the waveform adder, and performs addition operation according to the signal gain value by the waveform adder to form an added signal and outputs the added signal to the power amplifier; and the power amplifier amplifies the addition signal and outputs the amplified addition signal to the loudspeaker.
2. The speaker smart power control system as recited in claim 1, wherein the clipping control module of the platform calculator further determines that the clipping control of the waveform of the input signal is not necessary if the delay of the peak power duration of the input signal is less than the delay threshold.
3. The speaker smart power control system as recited in claim 1, wherein the signal detection value comprises a voltage value that tracks the hardware circuit unit.
4. The system of claim 1, wherein the power calculation module calculates the equivalent power value through an algorithm, and the algorithm performs a calculation of the following equation (1) to obtain a root mean square value:
wherein, XiIs a plurality of said signal envelope values received from said filter detection module, i being a natural number from 1 to N; xrmsThe root mean square value represents the equivalent power value.
5. The utility model provides a speaker intelligence power control method, is used for speaker intelligence power control system, speaker intelligence power control system includes hardware circuit unit, with the platform calculator of hardware circuit unit electric connection, hardware circuit unit includes feed-forward processing unit, waveform adder, power amplifier and the speaker that connects gradually, characterized in that, speaker intelligence power control method includes:
carrying out envelope tracking on an input signal through the platform calculator to obtain a signal envelope value;
calculating an equivalent power value according to the signal envelope value;
judging that the time delay is within a given interval time delay, if the continuous time delay of the peak power of the equivalent power value is greater than or equal to a time delay threshold, carrying out amplitude limiting control on the waveform of the input signal to be output to the hardware circuit unit to obtain an amplitude limiting signal, and controlling the waveform of the amplitude limiting signal within the signal waveform amplitude corresponding to the rated power;
tracking and calculating the amplitude limiting signal through the feedforward processing part to obtain a signal detection value;
judging whether a signal gain value needs to be adjusted or not according to the signal detection value, and outputting the adjusted signal gain value to the waveform adder in real time;
performing addition operation according to the signal gain value through the waveform adder to form an added signal and outputting the added signal to the power amplifier; and
and amplifying the added signal by the power amplifier and outputting the amplified signal to the loudspeaker.
6. The method of claim 5, wherein said determining comprises determining that said clipping control of the waveform of said input signal is not necessary if said peak power of said input signal continues for a delay time less than a delay threshold.
7. The method of claim 5, wherein said tracking said limited signal to obtain said signal detection value comprises tracking a voltage value of said hardware circuit unit.
8. The method of claim 5, wherein adjusting the signal gain value comprises determining whether to select a fast clock or a slow clock.
9. The method of claim 5, wherein the calculating the equivalent power value is performed by an algorithm, and the algorithm is performed by the following equation (1) to obtain a root mean square value:
wherein, XiIs a plurality of said signal envelope values received from a filter detection module, i being a natural number from 1 to N; xrmsThe root mean square value represents the equivalent power value.
10. The method of claim 5, wherein the filtering noise of the input signal is performed before the platform calculator performs envelope tracking on the input signal to obtain the signal envelope value.
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| CN111556408A (en) | 2020-08-18 |
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Effective date of registration: 20220823 Address after: 201306 building C, No. 888, Huanhu West 2nd Road, Lingang New Area, Pudong New Area, Shanghai Patentee after: Shanghai Fourier Semiconductor Co.,Ltd. Address before: 200233 Room 202, floor 2, building 8, No. 471 Guiping Road, Xuhui District, Shanghai Patentee before: SHANGHAI FUGUI ELECTRONIC TECHNOLOGY CO.,LTD. |