CN113079438A - Loudspeaker protection method, loudspeaker protection device and storage medium - Google Patents
Loudspeaker protection method, loudspeaker protection device and storage medium Download PDFInfo
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- CN113079438A CN113079438A CN202010010905.2A CN202010010905A CN113079438A CN 113079438 A CN113079438 A CN 113079438A CN 202010010905 A CN202010010905 A CN 202010010905A CN 113079438 A CN113079438 A CN 113079438A
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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
- H04R3/007—Protection circuits for transducers
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Abstract
The disclosure relates to a horn protection method, a horn protection device and a storage medium. The loudspeaker is driven by the intelligent power amplifier to produce sound, and the loudspeaker protection method comprises the following steps: detecting a direct current signal at the last-stage analog output end of the intelligent power amplifier; in response to detecting a DC signal, the DC signal is canceled to protect the horn. Through this disclosure, can guarantee that the direct current that intelligent power amplifier produced can not export to loudspeaker, and then promote the effect of loudspeaker protection.
Description
Technical Field
The present disclosure relates to the field of terminal technologies, and in particular, to a speaker protection method, a speaker protection device, and a storage medium.
Background
In the related art, a terminal uses a smart Power Amplifier (smart PA) to drive a speaker and the like to generate sound. But smart PA will output a dc signal in abnormal situations. When the smart PA outputs a direct current signal to the loudspeaker, the loudspeaker cannot sound, and a large amount of heat can be generated in a short time and even burnt.
In the related art, in order to protect the horn, a high pass filter (high pass filter) for blocking direct current is added to the smart PA digital module to filter the direct current at the digital signal end, so as to control the direct current signal output by the smart PA not to be output to two ends of the horn. However, direct current may be generated between the high pass filter and the horn, so that it cannot be completely ensured that the direct current generated by the smart PA is not output to the horn, and the protection effect of the horn is not good.
Disclosure of Invention
To overcome the problems in the related art, the present disclosure provides a horn protection method, a horn protection apparatus, and a storage medium.
According to a first aspect of the embodiments of the present disclosure, there is provided a loudspeaker protection method, in which the loudspeaker is driven by a smart power amplifier to produce sound, the loudspeaker protection method includes:
detecting a direct current signal at the last-stage analog output end of the intelligent power amplifier; in response to detecting a DC signal, the DC signal is canceled to protect the horn.
In one embodiment, detecting a dc signal at the last stage analog output of the smart power amplifier comprises: detecting a voltage signal fed back to the intelligent power amplifier by the loudspeaker at the last-stage analog output end; and detecting a direct current signal according to a voltage signal fed back to the intelligent power amplifier by the horn.
In another embodiment, detecting a dc signal according to a voltage signal fed back from the horn to the smart power amplifier includes:
if the mean value of the integral values of the voltage signals fed back to the intelligent power amplifier by the horn is larger than a specified limit value, determining that a direct current signal is detected; the average value of the integrated values of the voltage signals is a voltage value obtained by integrating and summing the voltage signals and averaging, and the voltage signals subjected to integration and summation are the voltage signals detected in the specified time.
In yet another embodiment, the specified limit is determined according to the voltage value of the voltage signal and the specified time and is smaller than a specified voltage value.
In another embodiment, the detecting a dc signal according to a voltage signal fed back from the horn to the smart power amplifier includes:
and if the voltage signal fed back to the intelligent power amplifier by the horn is not detected to pass through a zero signal within the specified time, determining that the direct-current signal is detected.
In another embodiment, the eliminating the dc signal includes:
restarting the intelligent power amplifier; or to power down the smart power amplifier.
According to a second aspect of the embodiments of the present disclosure, there is provided a loudspeaker protection device, the loudspeaker is driven by a smart power amplifier to generate sound, the loudspeaker protection device includes:
the detection unit is used for detecting a direct current signal at the last-stage analog output end of the intelligent power amplifier; and the protection unit is used for eliminating the direct current signal to protect the loudspeaker in response to detecting the direct current signal.
In one embodiment, the detection unit is configured to detect a dc signal at the last stage analog output of the smart power amplifier in the following manner: detecting a voltage signal fed back to the intelligent power amplifier by the loudspeaker at the last-stage analog output end; and detecting a direct current signal according to a voltage signal fed back to the intelligent power amplifier by the horn.
In another embodiment, the detecting unit is configured to detect a dc signal according to a voltage signal fed back to the smart power amplifier by the horn in the following manner:
if the mean value of the integral values of the voltage signals fed back to the intelligent power amplifier by the horn is larger than a specified limit value, determining that a direct current signal is detected; the average value of the integrated values of the voltage signals is a voltage value obtained by integrating and summing the voltage signals and averaging, and the voltage signals subjected to integration and summation are the voltage signals detected in the specified time.
In yet another embodiment, the specified limit is determined according to the voltage value of the voltage signal and the specified time and is smaller than a specified voltage value.
In another embodiment, the detecting unit is configured to detect a dc signal according to a voltage signal fed back to the smart power amplifier by the horn as follows:
and if the voltage signal fed back to the intelligent power amplifier is not detected to pass through a zero signal within a specified time, determining that a direct current signal is detected.
In another embodiment, the protection unit eliminates the dc signal as follows:
restarting the intelligent power amplifier; or to power down the smart power amplifier.
According to a third aspect of the embodiments of the present disclosure, there is provided a horn protecting device, including:
a processor; a memory for storing processor-executable instructions;
wherein the processor is configured to: the horn protection method of the first aspect or any one of the embodiments of the first aspect is performed.
According to a fourth aspect of the embodiments of the present disclosure, there is provided a non-transitory computer-readable storage medium, where instructions of the storage medium, when executed by a processor of a mobile terminal, enable the mobile terminal to perform the loudspeaker protection method described in the first aspect or any one of the implementation manners of the first aspect.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: the direct current signal is detected at the last-stage analog output end of the intelligent power amplifier, and the direct current signal is eliminated when the direct current signal is detected, so that the direct current generated by the intelligent power amplifier can be prevented from being output to the loudspeaker, and the loudspeaker protection effect is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic view of a horn configuration according to an exemplary embodiment.
Fig. 2 is a flow chart illustrating a horn protection method according to an exemplary embodiment.
Fig. 3 is a flow chart illustrating a horn protection method according to an exemplary embodiment.
Fig. 4 is a schematic diagram illustrating detection of an ac signal according to an exemplary embodiment.
Fig. 5 is a schematic diagram illustrating dc signal detection according to an exemplary embodiment.
Fig. 6 is a block diagram illustrating a horn protection device according to an exemplary embodiment.
Fig. 7 is a block diagram illustrating an apparatus for horn protection according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The loudspeaker protection method provided by the embodiment of the disclosure is suitable for a loudspeaker which is driven by a smart power amplifier (smart PA) to produce sound, and the loudspeaker can be installed on a terminal. Fig. 1 shows a schematic diagram of a smart PA driven horn sounding. In fig. 1, smart PA processes the generated signal in the digital part and finally outputs the processed signal to the loudspeaker in an analog mode. Typically, smart PAs are with current/voltage (I/V) feedback, also known as I/V sense. The I/V sense is arranged at the last-stage analog output end of the smart PA, and the signal sense at the two ends of the horn is returned to be used for calculating the direct-current resistance value of the horn and predicting the real-time temperature of the horn so as to protect the horn in real time.
According to the loudspeaker protection method provided by the embodiment of the disclosure, the direct current signal is detected at the last-stage analog output end of the smart PA, and the direct current signal generated by the smart PA is eliminated in response to the detection of the direct current signal, so that the loudspeaker is protected from continuous direct current, and the purpose of protecting the loudspeaker is achieved.
Fig. 2 is a flowchart illustrating a horn protection method according to an exemplary embodiment, where the horn protection method is applied to a smart PA, as shown in fig. 2, and can also be understood as being applied to a terminal mounted with a horn, and the horn is driven by the smart PA to generate sound, and the method includes the following steps.
In step S11, a dc signal is detected at the last stage analog output of the smart PA.
In step S12, in response to detecting the dc signal, the dc signal is cancelled to protect the horn.
According to the loudspeaker protection method provided by the embodiment of the disclosure, the direct current signal is detected at the last-stage analog output end of the smart PA, and the direct current signal generated by the smart PA is eliminated in response to the detection of the direct current signal, so that the loudspeaker is protected from continuous direct current, and the purpose of protecting the loudspeaker is achieved.
In an implementation manner of the embodiment of the disclosure, a voltage signal returned by a loudspeaker I/V sense is detected at a last-stage analog output end of a smart PA, whether signals at two ends of a current loudspeaker are direct currents or not is judged according to the voltage signal returned by the loudspeaker I/V sense, and then detection of the direct current signal is realized, and when the direct current signal is judged to be detected, the direct current signal is eliminated to protect the loudspeaker.
In the embodiment of the present disclosure, the elimination of the dc signal generated by the smart PA may be realized by restarting (reset) the smart PA, or by powering off (mute) the smart PA.
Fig. 3 is a flow chart illustrating a method of horn protection according to an exemplary embodiment, as shown in fig. 3, including the following steps.
In step S21, a voltage signal fed back to smart PA by the horn, that is, a voltage signal returned by I/V sense is detected.
In step S22, a dc signal is detected based on the voltage signal returned by I/V sense.
In the embodiment of the disclosure, the voltage signal returned by the I/V sense may be subjected to arithmetic operation to determine whether a dc signal is detected.
In one example, the embodiment of the disclosure may perform an integral summation and an averaging on the voltage signal x returned by the I/V sense within a specified time (assumed to be within a period of time t), to obtain an average value of the integral values of the voltage signals returned by the I/V sense, and the average value is recorded as the average value
Wherein A is the average value of the integral values of the voltage signals returned by the I/V sense, and t is a designated time. In the embodiment of the disclosure, the average value of the integral values of the voltage signals returned by the I/V sense is compared with a specified limit value to determine whether a direct current signal is detected.
If the signal is alternating, the signal alternates between positive and negative values, as shown in fig. 4, so the mean value a of the integrated values averaged by the signal integration summation over time t will be below a certain limit value Z. If the signal is dc, the signal has only positive or only negative values, as shown in fig. 5. the mean value A of the integrated values after the signal integration and summation in the time t is averaged is larger than the limit value Z. In other words, in the embodiment of the present disclosure, if the average value of the integrated values of the voltage signals returned by the I/V sense is greater than the specified limit, it is determined that the dc signal is detected. And if the average value of the integrated values of the voltage signals returned by the I/V sense is lower than a specified limit value, determining that the detected signals are alternating current signals.
The specified limit value Z referred to above in the embodiments of the present disclosure may be understood as being determined according to the voltage value of the voltage signal returned by the I/V sense and the specified time t. Usually, the specified limit value Z should not be set too large and smaller than the specified voltage value. The limit Z is typically specified as an empirical value for a number of accumulated exercises. For example, if the voltage value of the voltage signal returned by the I/V sense is 2.8V and the specified time t is 0.1 second, the specified limit value Z may be set to a voltage value smaller than 1V.
In another example, whether the dc signal is detected may be determined by determining whether the voltage signal returned by the I/V sense passes through the zero signal within a specified time in the embodiment of the present disclosure. Wherein the zero crossing signal is understood to have a zero crossing operation.
For example, in fig. 4, the ac signal is converted back and forth between a positive signal and a negative signal, and the zero crossing signal is detected when a signal point 0 is passed during the conversion process, namely the zero crossing. In fig. 5, the dc signal will stay in one direction (in the positive signal direction or the negative signal direction) all the time, and there will be no zero-crossing action. Therefore, whether the signal is direct current or alternating current can be judged by using the action of whether the signal has zero crossing within the time t: zero-crossing action exists between t, and the signal is an alternating current signal; and no zero-crossing action exists in the time t, and the signal is a direct-current signal. In other words, in the embodiment of the present disclosure, within the specified time, the voltage signal returned by the I/V sense is not detected to pass through the zero signal, and it is determined that the dc signal is detected. And in a specified time, detecting that the voltage signal returned by the I/V sense passes through a zero signal, and determining that the direct current signal is not detected.
According to the embodiment of the disclosure, whether the two ends of the horn have the direct current signals or not can be detected in the above manner.
In step S23, in response to detecting the dc signal, the smart PA is restarted or powered off to eliminate the dc signal protection horn.
In the embodiment of the present disclosure, a dc signal is output at the last stage of analog output of the smart PA, and when a dc is detected, a Digital Signal Processor (DSP) of the smart PA can perform actions such as reset smart PA chip and mute output, so as to eliminate the dc signal, and eliminate the abnormal state of the smart PA chip output dc, thereby protecting the horn from dc burnout at the last stage of analog end, and ensuring that the dc current generated by the smart power amplifier is not output to the horn, thereby improving the effect of horn protection.
Based on the same conception, the embodiment of the disclosure also provides a loudspeaker protection device.
It is understood that, in order to implement the above functions, the speaker protection device provided in the embodiments of the present disclosure includes a hardware structure and/or a software module for performing each function. The disclosed embodiments can be implemented in hardware or a combination of hardware and computer software, in combination with the exemplary elements and algorithm steps disclosed in the disclosed embodiments. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
Fig. 6 is a block diagram illustrating a horn protection device according to an exemplary embodiment. Referring to fig. 6, the horn protection device 100 includes a detection unit 101 and a protection unit 102.
And the detection unit 101 is configured to detect a dc signal at the last stage analog output end of the intelligent power amplifier. And the protection unit 102 is used for eliminating the direct current signal to protect the loudspeaker in response to detecting the direct current signal.
In one embodiment, the detection unit 101 detects a voltage signal fed back to the smart power amplifier by the horn at the last stage analog output terminal of the smart PA. And detecting the direct current signal according to the voltage signal fed back to the intelligent power amplifier by the horn.
If the detection unit 101 detects that the average value of the integrated values of the voltage signals fed back to the intelligent power amplifier by the horn is greater than a specified limit value, it is determined that the direct-current signal is detected. The average value of the integrated values of the voltage signals is a voltage value obtained by integrating and summing the voltage signals and averaging, and the voltage signals subjected to integration and summation are the voltage signals detected in the specified time.
In another embodiment, the specified limit value is determined according to the voltage value of the voltage signal and the specified time and is smaller than the specified voltage value.
In another embodiment, if the detecting unit 101 does not detect that the voltage signal fed back to the smart power amplifier passes through the zero signal within a predetermined time, it is determined that the dc signal is detected.
In yet another embodiment, the protection unit 102 eliminates the dc current by restarting the smart power amplifier. Or the protection unit 102 powers off the intelligent power amplifier to eliminate the direct current.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
Fig. 7 is a block diagram illustrating an apparatus 200 for protection according to an example embodiment. For example, the apparatus 200 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, an exercise device, a personal digital assistant, and the like.
Referring to fig. 7, the apparatus 200 may include one or more of the following components: a processing component 202, a memory 204, a power component 206, a multimedia component 208, an audio component 210, an input/output (I/O) interface 212, a sensor component 214, and a communication component 216.
The processing component 202 generally controls overall operation of the device 200, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 202 may include one or more processors 220 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 202 can include one or more modules that facilitate interaction between the processing component 202 and other components. For example, the processing component 202 can include a multimedia module to facilitate interaction between the multimedia component 208 and the processing component 202.
The multimedia component 208 includes a screen that provides an output interface between the device 200 and the user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 208 includes a front facing camera and/or a rear facing camera. The front camera and/or the rear camera may receive external multimedia data when the device 200 is in an operating mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.
The audio component 210 is configured to output and/or input audio signals. For example, audio component 210 includes a Microphone (MIC) configured to receive external audio signals when apparatus 200 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 204 or transmitted via the communication component 216. In some embodiments, audio component 210 also includes a speaker for outputting audio signals.
The I/O interface 212 provides an interface between the processing component 202 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.
The sensor component 214 includes one or more sensors for providing various aspects of status assessment for the device 200. For example, the sensor component 214 may detect an open/closed state of the device 200, the relative positioning of components, such as a display and keypad of the apparatus 200, the sensor component 214 may also detect a change in position of the apparatus 200 or a component of the apparatus 200, the presence or absence of user contact with the apparatus 200, orientation or acceleration/deceleration of the apparatus 200, and a change in temperature of the apparatus 200. The sensor assembly 214 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 214 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 214 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 216 is configured to facilitate wired or wireless communication between the apparatus 200 and other devices. The device 200 may access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 216 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 216 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the apparatus 200 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described methods.
In an exemplary embodiment, a non-transitory computer readable storage medium comprising instructions, such as memory 204, comprising instructions executable by processor 220 of device 200 to perform the above-described method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
It is further understood that the use of "a plurality" in this disclosure means two or more, as other terms are analogous. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It will be further understood that the terms "first," "second," and the like are used to describe various information and that such information should not be limited by these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the terms "first," "second," and the like are fully interchangeable. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure.
It is further to be understood that while operations are depicted in the drawings in a particular order, this is not to be understood as requiring that such operations be performed in the particular order shown or in serial order, or that all illustrated operations be performed, to achieve desirable results. In certain environments, multitasking and parallel processing may be advantageous.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (14)
1. A loudspeaker protection method is characterized in that the loudspeaker is driven by a smart power amplifier to produce sound, and the loudspeaker protection method comprises the following steps:
detecting a direct current signal at the last-stage analog output end of the intelligent power amplifier;
in response to detecting a DC signal, the DC signal is canceled to protect the horn.
2. The horn protection method of claim 1, wherein detecting a dc signal at a last stage analog output of the smart power amplifier comprises:
detecting a voltage signal fed back to the intelligent power amplifier by the loudspeaker at the last-stage analog output end;
and detecting a direct current signal according to a voltage signal fed back to the intelligent power amplifier by the horn.
3. The horn protection method according to claim 2, wherein detecting a dc signal according to a voltage signal fed back from the horn to the smart power amplifier comprises:
if the mean value of the integral values of the voltage signals fed back to the intelligent power amplifier by the horn is larger than a specified limit value, determining that a direct current signal is detected;
the average value of the integrated values of the voltage signals is a voltage value obtained by integrating and summing the voltage signals and averaging, and the voltage signals subjected to integration and summation are the voltage signals detected in the specified time.
4. The horn protection method according to claim 3, wherein the specified limit is determined according to the voltage value of the voltage signal and the specified time and is smaller than a specified voltage value.
5. The horn protection method according to claim 2, wherein detecting a dc signal according to a voltage signal fed back from the horn to the smart power amplifier comprises:
and if the voltage signal fed back to the intelligent power amplifier by the horn is not detected to pass through a zero signal within the specified time, determining that the direct-current signal is detected.
6. The horn protection method of any one of claims 1 to 5, wherein the cancelling the DC signal comprises:
restarting the intelligent power amplifier; or to power down the smart power amplifier.
7. The utility model provides a loudspeaker protection device which characterized in that, loudspeaker are driven the sound production by intelligent power amplifier, loudspeaker protection device includes:
the detection unit is used for detecting a direct current signal at the last-stage analog output end of the intelligent power amplifier;
and the protection unit is used for eliminating the direct current signal to protect the loudspeaker in response to detecting the direct current signal.
8. The horn protection device of claim 7, wherein the detecting unit is configured to detect the dc signal at the last stage analog output terminal of the smart power amplifier in the following manner:
detecting a voltage signal fed back to the intelligent power amplifier by the loudspeaker at the last-stage analog output end;
and detecting a direct current signal according to a voltage signal fed back to the intelligent power amplifier by the horn.
9. The horn protection device of claim 8, wherein the detecting unit is configured to detect the dc signal according to a voltage signal fed back to the smart power amplifier by the horn in the following manner:
if the mean value of the integral values of the voltage signals fed back to the intelligent power amplifier by the horn is larger than a specified limit value, determining that a direct current signal is detected;
the average value of the integrated values of the voltage signals is a voltage value obtained by integrating and summing the voltage signals and averaging, and the voltage signals subjected to integration and summation are the voltage signals detected in the specified time.
10. The horn protection device of claim 9, wherein the specified limit is determined according to the voltage value of the voltage signal and the specified time, and is smaller than a specified voltage value.
11. The horn protection device of claim 8, wherein the detecting unit is configured to detect the dc signal according to a voltage signal fed back to the smart power amplifier by the horn in the following manner:
and if the voltage signal fed back to the intelligent power amplifier is not detected to pass through a zero signal within a specified time, determining that a direct current signal is detected.
12. The horn protection device according to any one of claims 7 to 11, wherein the protection unit cancels the dc signal by:
restarting the intelligent power amplifier; or to power down the smart power amplifier.
13. A horn protection device, comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to: -performing the horn protection method of any one of claims 1 to 6.
14. A non-transitory computer readable storage medium having instructions therein which, when executed by a processor of a mobile terminal, enable the mobile terminal to perform the horn protection method of any one of claims 1 to 6.
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| CN103248593A (en) * | 2012-02-09 | 2013-08-14 | 泰凌微电子（上海）有限公司 | Method and system for frequency offset estimation and elimination |
| CN204376839U (en) * | 2015-02-10 | 2015-06-03 | 深圳市芯电威科技有限公司 | A kind of audio-frequency power amplifier load detecting circuit |
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| CN106658295A (en) * | 2017-01-20 | 2017-05-10 | 深圳市中移联半导体科技有限公司 | Loudspeaker direct voltage detection circuit |
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