CN117880724A - Speaker short-circuit open-circuit detection method and speaker fault detection system - Google Patents
Speaker short-circuit open-circuit detection method and speaker fault detection system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
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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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/05—Detection of connection of loudspeakers or headphones to amplifiers
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Abstract
The invention discloses a loudspeaker short-circuit and open-circuit detection method and a loudspeaker fault detection system, and belongs to the technical field of loudspeakers. The method for detecting the short-circuit and open-circuit of the loudspeaker comprises the following steps: short circuit detection: setting a preset reference signal as a first reference signal, and applying a first audio input signal to a driving module to provide a short circuit detection condition; judging whether the loudspeaker has short circuit fault or not according to the detection result signal output by the fault detection module under the short circuit detection condition; open circuit detection: setting a preset reference signal as a second reference signal, and applying a second audio input signal to the driving module to provide open circuit detection conditions; judging whether the loudspeaker has an open circuit fault or not according to a detection result signal under the open circuit detection condition; wherein the amplitude of the first audio input signal is smaller than the amplitude of the second audio input signal, and the value of the first reference signal is greater than or equal to the value of the second reference signal. The embodiment of the invention can provide a simple and convenient method for detecting the short circuit and the open circuit of the loudspeaker.
Description
Technical Field
The invention relates to the technical field of speakers, in particular to a speaker short-circuit and open-circuit detection method and a speaker fault detection system.
Background
Currently, various electronic products, such as mobile phones, tablets, vehicle-mounted instruments, and the like, use speakers (or speakers) to sound. A speaker short circuit or open circuit fault may occur in the process of manufacturing the electronic product or in the process of using the electronic product by an end user, which affects the use safety of the electronic product, so that it is needed to provide a simple method for detecting the speaker short circuit and open circuit.
Disclosure of Invention
The invention provides a loudspeaker short circuit and open circuit detection method and a loudspeaker fault detection system, which are used for providing a simple loudspeaker short circuit and open circuit detection method.
In a first aspect, an embodiment of the present invention provides a method for detecting a short-circuit and open-circuit of a speaker, which is applied to a speaker fault detection system, where the speaker fault detection system includes: the device comprises a loudspeaker, a driving module and a fault detection module, wherein the driving module is used for providing a driving signal for the loudspeaker according to an audio input signal, and the fault detection module is used for comparing the driving signal with a preset reference signal to obtain a detection result signal;
the method for detecting the short-circuit and open-circuit of the loudspeaker comprises the following steps:
short circuit detection: setting the preset reference signal as a first reference signal, and applying a first audio input signal to the driving module to provide a short circuit detection condition; judging whether the loudspeaker has a short circuit fault or not according to a detection result signal output by the fault detection module under the short circuit detection condition;
open circuit detection: setting the preset reference signal as a second reference signal, and applying a second audio input signal to the driving module to provide an open circuit detection condition; judging whether the loudspeaker has an open circuit fault or not according to a detection result signal output by the fault detection module under the open circuit detection condition;
wherein the amplitude of the first audio input signal is smaller than the amplitude of the second audio input signal, and the value of the first reference signal is larger than or equal to the value of the second reference signal.
Optionally, in the short circuit detection step, if the detection result signal under the short circuit detection condition indicates that the driving signal is greater than the first reference signal, determining that a short circuit fault occurs in the speaker;
in the open circuit detection step, if the detection result signal under the open circuit detection condition represents that the driving signal is smaller than the second reference signal, the open circuit fault of the loudspeaker is judged.
Optionally, the detection result signal output by the fault detection module in a default output state represents that the driving signal is smaller than the preset reference signal;
the short circuit detection step further includes: after judging that the loudspeaker has a short-circuit fault, controlling the fault detection module to recover the default output state;
and/or the number of the groups of groups,
the open circuit detection step further includes: and after the loudspeaker is judged to not have the open circuit fault, controlling the fault detection module to recover the default output state.
Optionally, the method for detecting the short-circuit and open-circuit of the loudspeaker includes:
executing the short circuit detection step;
and when the speaker is judged not to have short circuit fault, executing the open circuit detection step.
Optionally, the first audio input signal is determined according to the first reference signal and a short circuit impedance threshold of the speaker.
Optionally, the step of determining the first audio input signal comprises:
determining a first reference audio input signal corresponding to the short-circuit impedance threshold according to the first reference signal;
and selecting the audio input signal with the amplitude smaller than or equal to that of the first reference audio input signal as the first audio input signal.
Optionally, the second audio input signal is determined according to the second reference signal and an open circuit impedance threshold of the speaker.
Optionally, the setting step of the second audio input signal includes:
determining a second reference audio input signal corresponding to the open-circuit impedance threshold according to the second reference signal;
and selecting the audio input signal with the amplitude greater than or equal to the second reference audio input signal as the second audio input signal.
Optionally, the speaker fault detection system further includes an upper computer;
the method for detecting the short-circuit and open-circuit of the loudspeaker further comprises the following steps:
when judging that the speaker has a short circuit fault, reporting the judging result to the upper computer as a speaker short circuit;
when judging that the loudspeaker has an open circuit fault, reporting a judgment result to the upper computer as the loudspeaker is open circuit;
and when judging that the loudspeaker has no short circuit fault and no open circuit fault, reporting the judgment result to the upper computer when the loudspeaker is in a normal state.
In a second aspect, an embodiment of the present invention further provides a speaker fault detection system, including: the device comprises a loudspeaker, a driving module, a fault detection module and a control module; the driving module is respectively connected with the loudspeaker and the fault detection module, and the control module is respectively connected with the driving module and the fault detection module; the control module is used for executing the method for detecting the short-circuit and open-circuit of the loudspeaker, which is provided by any embodiment of the invention.
In the method for detecting the short circuit and the open circuit of the loudspeaker, provided by the embodiment of the invention, the short circuit fault and the open circuit fault can be performed based on the same fault detection system, the short circuit and the open circuit can be switched by adjusting the audio input signal and the preset reference signal according to the type of the fault to be detected in the detection process, and even the preset reference signal is not required to be adjusted under the condition that the first reference signal is equal to the second reference signal, so that the detection process is simple, convenient and feasible. And in the detection process, the driving signal is not required to be extracted to carry out a series of processes, and the detection result signal is directly extracted to determine whether the fault corresponding to the fault type to be detected occurs or not, so that the fault discrimination logic is simple. In summary, the embodiment of the invention provides a simple method for detecting the short circuit and the open circuit of the loudspeaker, and can ensure the reliability of the detection result.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a speaker fault detection system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for detecting a short circuit and an open circuit of a speaker according to an embodiment of the present invention;
fig. 3 is a flow chart of another method for detecting a short-circuit and an open-circuit of a speaker according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The embodiment of the invention provides a method for detecting a short circuit and an open circuit of a loudspeaker, which can be applied to a loudspeaker fault detection system, for example, the method is executed by a control module in the loudspeaker fault detection system, and the short circuit and the open circuit of the loudspeaker can be detected simply, conveniently and quickly. In order to facilitate explanation of the detection method, the structure of the speaker failure detection system will be first described by way of example with reference to fig. 1. Fig. 1 is a schematic structural diagram of a speaker fault detection system according to an embodiment of the present invention. As shown in fig. 1, an exemplary speaker fault detection system includes: speaker 40, drive module 20, fault detection module 30, and control module 10. The driving module 20 is respectively connected with the loudspeaker 40 and the fault detection module 30, and the control module 10 is respectively connected with the driving module 20 and the fault detection module 30; the driving module 20 is configured to provide a driving signal SOUT to the speaker 40 according to the audio input signal SIN, and the fault detection module 30 is configured to compare the driving signal SOUT with a predetermined reference signal SREF to obtain a detection result signal SOCP. The audio input signal SIN, the driving signal SOUT and the predetermined reference signal SREF are electrical signals, for example, the audio input signal SIN is a voltage signal, and the driving signal SOUT and the predetermined reference signal SREF are current signals. The detection result signal may be a logic signal (for example, represented by a potential high or low), for example, when the detection result signal SOCP is 1, the driving signal SOUT is represented by the preset reference signal SREF, for example, an overcurrent condition occurs; when the detection result signal SOCP is 0, the driving signal SOUT is smaller than the predetermined reference signal SREF, for example, indicating that no overcurrent condition occurs. It should be noted that, here, the driving signal SOUT and the preset reference signal SREF may be considered to be compared with each other by absolute values, that is, the signal magnitude is compared, and the direction is not considered. The control module 10 is configured to perform a method for detecting a short-circuit and open-circuit of a speaker, for example, may form a corresponding audio input signal SIN and/or a preset reference signal SREF according to a type of a fault to be detected, and determine whether the speaker has a corresponding fault according to a detection result signal SOCP.
The method for detecting a short-circuit and open-circuit of a speaker will be described below. Fig. 2 is a flow chart of a method for detecting a short-circuit and open-circuit of a speaker according to an embodiment of the present invention. Referring to fig. 2, the method includes:
s110, short circuit detection: setting a preset reference signal as a first reference signal, and applying a first audio input signal to a driving module to provide a short circuit detection condition; judging whether the loudspeaker has short circuit fault or not according to the detection result signal output by the fault detection module under the short circuit detection condition.
The preset reference signal may be an electrical signal applied to the fault detection module, or generated by a built-in structure in the fault detection module, and may be generated by any existing structure capable of providing a stable electrical signal, for example, a current source or a voltage source, which may be a structure with an adjustable output electrical signal, or a replaceable structure detachably connected to the fault detection module, and specific structures will not be described herein.
For example, the first reference signal may be set according to actual operating characteristics of the speaker, such as power class and short-circuit state impedance characteristics. The first audio input signal may be set according to a first reference signal. Illustratively, in the short circuit detecting step, the criterion may be: and when the detection result signal under the short circuit detection condition represents that the driving signal is larger than the first reference signal, judging that the loudspeaker has short circuit fault. Specifically, if the driving signal of the speaker is too large under the condition of short-circuit detection in which the first reference signal and the first audio input signal are applied to the system, the comparison value in the short-circuit detection of the first reference signal is exceeded, for example, an overcurrent condition occurs, which corresponds to that the current impedance value of the speaker can be determined to be too small, so that it can be determined that the speaker has a short-circuit fault. The above-mentioned judging standard can be stored in the control module in advance, so that once the control module obtains the detection result signal, it can judge whether the loudspeaker has short-circuit fault according to the standard, and does not need other processing.
S120, setting a preset reference signal as a second reference signal, and applying a second audio input signal to the driving module to provide open-circuit detection conditions; judging whether the loudspeaker has an open circuit fault or not according to a detection result signal output by the fault detection module under the open circuit detection condition.
For example, the second reference signal may be set according to actual operating characteristics of the speaker, such as power class and open state impedance characteristics. The second audio input signal may be set according to a second reference signal. Illustratively, in the open circuit detection step, the criterion may be: and when the detection result signal under the open circuit detection condition represents that the driving signal is smaller than the first reference signal, judging that the loudspeaker has open circuit fault. Specifically, if the drive signal of the speaker is small under the open circuit detection condition in which the second reference signal and the second audio input signal are applied to the system, the comparison value in the open circuit detection of the second reference signal cannot be reached, which corresponds to the fact that the current impedance value of the speaker can be determined to be excessively large, and therefore, it can be determined that the speaker has an open circuit failure. The above-mentioned judging standard can be stored in the control module in advance, so that once the control module obtains the detection result signal, it can judge whether the loudspeaker has open circuit fault according to the standard, and no other processing is required.
Wherein the amplitude of the first audio input signal may be set to be smaller than the amplitude of the second audio input signal, the value of the first reference signal being greater than or equal to the value of the second reference signal. If the system is connected with the first audio input signal with smaller amplitude, the driving signal can still be larger than the unified reference signal or the larger first reference signal, and the short circuit fault of the loudspeaker can be confirmed; likewise, if the driving signal cannot exceed the unified reference signal or the smaller second reference signal under the condition that the system is connected to the first audio input signal with larger amplitude, the open-circuit fault of the loudspeaker can be confirmed. By the arrangement, the accuracy and the reliability of short circuit detection and open circuit detection results can be ensured. For example, the first reference signal and the second reference signal may be set to be the same, so that the short circuit detection and the open circuit detection are performed under the same reference standard, thereby simplifying the detection process, avoiding erroneous judgment of the detection result caused by erroneous setting of the reference signals, and being capable of using a constant reference signal source, so as to be beneficial to ensuring the detection precision. Alternatively, the first reference signal and the second reference signal may be set to be different, so that the short circuit fault may be determined by using a larger reference value, and the open circuit fault may be determined by using a smaller reference value, so as to improve the reliability of the detection result.
In the method for detecting the short circuit and the open circuit of the loudspeaker, provided by the embodiment of the invention, the short circuit fault and the open circuit fault can be performed based on the same fault detection system, the short circuit and the open circuit can be switched by adjusting the audio input signal and the preset reference signal according to the type of the fault to be detected in the detection process, and even the preset reference signal is not required to be adjusted under the condition that the first reference signal is equal to the second reference signal, so that the detection process is simple, convenient and feasible. And in the detection process, the driving signal is not required to be extracted to carry out a series of processes, and the detection result signal is directly extracted to determine whether the fault corresponding to the fault type to be detected occurs or not, so that the fault discrimination logic is simple. In summary, the embodiment of the invention provides a simple method for detecting the short circuit and the open circuit of the loudspeaker, and can ensure the reliability of the detection result.
In the above embodiments, optionally, when the speaker needs to be short-circuited and open-circuited to be detected, the short-circuit detection step may be performed first, that is, S110 is performed first, and if it is determined that the speaker has a short-circuit fault, the detection may be ended; if it is determined that the speaker has not failed due to a short circuit, the open circuit detection step is performed, and then S120 is performed. Because the amplitude of the second audio input signal adopted in the open circuit detection step is larger, by executing the short circuit detection step first, the direct application of a large-amplitude signal under the condition that the state of the loudspeaker is unknown can be avoided, the generation of an oversized driving signal under the condition that the loudspeaker has a short circuit fault is avoided, and the damage to other components in the electronic equipment caused by the expansion of the fault is avoided.
It will be appreciated that the above described implementation is not a limitation of the present invention. In practical application, a proper detection flow can be selected according to requirements.
Based on the above embodiments, optionally, the detection result signal outputted by the fault detection module in the default output state represents that the driving signal is smaller than the preset reference signal. Then, the short circuit detection step further includes: after judging that the loudspeaker has a short-circuit fault, controlling the fault detection module to restore a default output state so as to carry out subsequent or next fault detection. And/or, the open circuit detection step further comprises: after judging that the loudspeaker has not had an open circuit fault, the fault detection module is controlled to restore the default output state so as to carry out subsequent or next fault detection.
With continued reference to the structure of fig. 1, taking the driving signal SOUT and the preset reference signal SREF as current signals as an example, the driving module 20 may include an audio processing unit and a driving unit, where the driving unit includes, for example, at least two driving tubes connected to the speaker 40, and the audio processing unit may generate PWM modulation signals for each driving tube according to the audio input signal SIN, so as to control the on state of each driving tube, thereby controlling the direction and magnitude of the driving current, and making the speaker 40 produce sound according to the driving current. The fault detection module 30 may include a plurality of fault detection units and a fault summarizing unit, where the fault detection units are configured to collect output currents of the driving tubes and compare the output currents with preset reference currents to obtain comparison results, and the fault summarizing unit is configured to obtain detection result signals SOCP according to the comparison results. For example, when there is a comparison result that the output current is greater than the preset reference current, the fault summarizing unit outputs the detection result signal SOCP indicating that the driving current is greater than the preset reference current. Then, for any predetermined reference signal SREF, if the detection result signal SOCP represents that the driving signal SOUT is greater than the predetermined reference signal SREF in any audio input signal SIN, it indicates that the actual impedance of the speaker 40 in the audio input signal SIN is smaller than the reference impedance value corresponding to the predetermined reference signal SREF, so that the driving signal SOUT is greater than the predetermined reference signal SREF; otherwise, if the detection result signal SOCP indicates that the driving signal SOUT is smaller than the predetermined reference signal SREF, it indicates that the actual impedance of the speaker 40 under the audio input signal SIN is smaller than the reference impedance value corresponding to the predetermined reference signal SREF, so that the driving signal SOUT is smaller than the predetermined reference signal SREF. Based on this, the configuration of the first audio input signal and the second audio input signal in the detection method can be performed. The following description is made.
In one embodiment, optionally, the first audio input signal is determined from a first reference signal, and a short circuit impedance threshold of the speaker. The short-circuit impedance threshold of the loudspeaker is a value smaller than the rated impedance of the loudspeaker, and when the actual impedance of the loudspeaker is smaller than the short-circuit impedance threshold, the loudspeaker is considered to have a short-circuit fault. For any speaker fault detection system, once the driving module 20 determines that the correspondence between the audio input signal SIN, the driving signal SOUT and the impedance of the speaker in the system is determined, the other one can be calculated by knowing any two of the above. For example, the relationship may be that the audio input signal SIN is equal to k times the product of the impedance of the driving signal SOUT and the speaker, k being a parameter related to the driving module 20. Based on the above, the short-circuit impedance threshold is used as the impedance of the speaker, the first reference signal is used as the driving signal, the audio input signals corresponding to the first reference signal and the short-circuit impedance threshold can be calculated according to the corresponding relation, and the first audio input signal is determined according to the calculated audio input signal, so that the first audio input signal can be suitable for short-circuit detection of the speaker.
In particular, the step of determining the first audio input signal may comprise:
1) And determining a first reference audio input signal corresponding to the short-circuit impedance threshold according to the first reference signal.
Specifically, this step corresponds to taking the audio input signal calculated according to the correspondence as the first reference audio input signal under the condition that the impedance of the speaker is equal to the short-circuit impedance threshold and the driving signal is equal to the first reference signal.
2) An audio input signal having an amplitude less than or equal to the amplitude of the first reference audio input signal is selected as the first audio input signal.
Taking the example that the amplitudes of the first audio input signal and the first reference audio input signal are equal, for example, the first reference audio input signal is directly used as the first audio input signal, if the detection result signal represents that the driving signal is larger than the first reference signal when the first reference audio input signal is applied to the driving module, the actual impedance of the current loudspeaker is smaller than the short-circuit impedance threshold value, and the short-circuit fault of the loudspeaker can be judged. When the first audio input signal is a signal with smaller amplitude than the first reference audio input signal, if the driving signal is still larger than the first reference signal, the actual impedance of the loudspeaker is smaller, and the judgment result of the short circuit fault of the loudspeaker based on the result is more reliable.
Similarly, the second audio input signal is determined based on the second reference signal and an open circuit impedance threshold of the speaker. The open circuit impedance threshold value of the loudspeaker is a value larger than the rated impedance of the loudspeaker, and when the actual impedance of the loudspeaker is larger than the open circuit impedance threshold value, the loudspeaker can be considered to have open circuit fault.
Specifically, the setting step of the second audio input signal includes:
1) And determining a second reference audio input signal corresponding to the open-circuit impedance threshold according to the second reference signal.
The same correspondence as in the above explanation is followed, and specifically, this step corresponds to taking the audio input signal calculated from the correspondence as the second reference audio input signal under the condition that the impedance of the speaker is equal to the open-circuit impedance threshold and the driving signal is equal to the second reference signal.
2) And selecting the audio input signal with the amplitude greater than or equal to that of the second reference audio input signal as the second audio input signal.
Taking the example that the amplitude of the second audio input signal is equal to that of the second reference audio input signal, for example, the second reference audio input signal is directly used as the second audio input signal, if the detection result signal represents that the driving signal is smaller than the second reference signal when the second reference audio input signal is applied to the driving module, the actual impedance of the current loudspeaker is larger than the open-circuit impedance threshold value, and the open-circuit fault of the loudspeaker can be judged. When the second audio input signal is a signal with larger amplitude than the second reference audio input signal, if the driving signal is still smaller than the first reference signal, the actual impedance of the loudspeaker is larger, and the judgment result of the open circuit fault of the loudspeaker based on the result is more reliable.
It should be noted that, in the embodiment of the present invention, the waveform and frequency of the audio input signal in the detection process are not limited, and may be specifically set according to actual requirements. For example, the first audio input signal and the second audio input signal may be set to be sinusoidal and have the same frequency to simplify the control logic.
Based on the above embodiments, optionally, the speaker fault detection system may further include an upper computer connected to the control module, and configured to send a detection related instruction to the control module and receive a detection result reported by the control module, so as to perform visualization and other processing, which is beneficial to reminding a user of timely performing fault processing. Then, the speaker short-circuit open-circuit detection method further includes:
when judging that the speaker has short circuit fault, reporting the judging result as the speaker short circuit to the host computer;
when judging that the loudspeaker has an open circuit fault, reporting the judging result to the host computer as the loudspeaker open circuit;
and when judging that the loudspeaker has no short circuit fault and no open circuit fault, reporting the judging result to the upper computer as normal state of the loudspeaker.
The overall flow of the method for detecting a speaker short-circuit and open-circuit is described below with reference to an embodiment, but is not limited thereto. Fig. 3 is a flow chart of another method for detecting a short-circuit and an open-circuit of a speaker according to an embodiment of the present invention. Referring to fig. 3, the speaker short-circuit open-circuit detection method includes:
s201, setting a first reference signal.
This step corresponds to setting a short circuit detection threshold, typically 4A, which can be adjusted according to a specific chip model, and the actual short circuit detection threshold can be different according to the actual chip output power. Illustratively, the setting may be via an associated interface in the fault detection module, e.g., providing the first reference signal to the associated interface in the fault detection module; or, transmitting a control signal through an associated interface in the fault detection module to regulate the output of the reference signal source in the fault detection module.
S202, playing the first audio input signal.
For example, the platform end may be set to open a play path, and the first audio input signal is provided to the driving module as a short circuit detection sound source. For example, the first audio input signal may be a sine wave signal with a frequency of 1000Hz, and typically has an amplitude of-6 dB, and for a power amplifier chip with a small output power, the signal amplitude may be suitably adjusted downward, for example, to be-12 dB.
S203, reading a detection result signal.
S204, judging whether the detection result signal represents that the driving signal is larger than a first reference signal or not; if yes, executing S205; if not, S206 is performed.
Wherein S201 and S202 correspond to providing a short circuit detection condition, in which the driving signal is greater than the first reference signal and is in an unexpected fault state, i.e. a short circuit fault state.
S205, reporting the judging result as a speaker short circuit.
S206, setting a second reference signal.
This step corresponds to setting an open circuit detection threshold, typically 0.1A, which can be adjusted according to a specific chip model, and the actual open circuit detection threshold can be different according to the accuracy of the actual chip detection circuit. For example, the setting may be performed through a relevant interface in the fault detection module, and the specific manner may refer to S201, which is not described herein.
S207, playing the second audio input signal.
The second audio input signal may be, for example, a sine wave signal with a frequency of 1000Hz, typically with an amplitude of, for example, more than-6 dB.
S208, reading a detection result signal.
S209, judging whether the detection result signal represents that the driving signal is larger than a second reference signal; if yes, executing S212; if not, S210 is performed.
Wherein S206 and S207 correspond to providing an open circuit detection condition under which the driving signal is smaller than the first reference signal to be in an unexpected fault state, i.e. an open circuit fault state.
S210, the control failure detection module restores the default output state.
S211, reporting the judging result as a speaker opening.
S212, the control failure detection module restores the default output state.
S213, reporting the judging result that the loudspeaker state is normal.
In summary, the embodiment of the invention provides a method for implementing speaker short circuit and open circuit detection based on a speaker fault detection system, wherein the short circuit and open circuit detection are implemented based on the same specific hardware structure, the signals to be regulated and controlled in different types of fault detection are fewer, the result signals to be obtained are fewer, the judgment mode is simple and easy to implement, and the method can provide a simple and convenient speaker short circuit and open circuit state detection method on an after-sale maintenance point or production line, thereby being convenient to popularize.
The embodiment of the invention also provides a loudspeaker fault detection system, which comprises a control module capable of executing the loudspeaker short-circuit and open-circuit detection method provided in any embodiment, and has the corresponding beneficial effects. For example, as shown in fig. 1, a speaker 40, a driving module 20, a failure detection module 30, and a control module 10 may be included in the speaker failure detection system. The driving module 20 is respectively connected with the loudspeaker 40 and the fault detection module 30, and the control module 10 is respectively connected with the driving module 20 and the fault detection module 30; the control module 10 is used to perform a speaker open circuit detection method.
Illustratively, the driver module 20 and the fault detection module 30 may be integrated in a power amplifier chip; the control module 10 can also be integrated in a power amplifier chip; the power amplifier chip is assembled in the same electronic device as the speaker 40, for example. The control module 10 can perform operations such as short circuit and open circuit detection or fault detection and driving under the control of the platform end. Alternatively, the control module 10 may be a controller integrated in the platform end, and other functional modules in the fault detection system are connected through an interface between the platform end and the power amplifier chip to provide a fault detection function. The specific system configuration may be set according to actual requirements, which is not limited herein.
It should be noted that, the speaker fault detection system provided by the embodiment of the present invention and the speaker short-circuit and open-circuit detection method provided by any embodiment of the present invention have corresponding beneficial effects, technical details not explained in detail in this embodiment may be seen in detail in the related description of the speaker short-circuit and open-circuit detection method provided by any embodiment of the present invention, and repeated descriptions are omitted.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. A speaker short-circuit open-circuit detection method, characterized by being applied to a speaker failure detection system, the speaker failure detection system comprising: the device comprises a loudspeaker, a driving module and a fault detection module, wherein the driving module is used for providing a driving signal for the loudspeaker according to an audio input signal, and the fault detection module is used for comparing the driving signal with a preset reference signal to obtain a detection result signal;
the method for detecting the short-circuit and open-circuit of the loudspeaker comprises the following steps:
short circuit detection: setting the preset reference signal as a first reference signal, and applying a first audio input signal to the driving module to provide a short circuit detection condition; judging whether the loudspeaker has a short circuit fault or not according to a detection result signal output by the fault detection module under the short circuit detection condition;
open circuit detection: setting the preset reference signal as a second reference signal, and applying a second audio input signal to the driving module to provide an open circuit detection condition; judging whether the loudspeaker has an open circuit fault or not according to a detection result signal output by the fault detection module under the open circuit detection condition;
wherein the amplitude of the first audio input signal is smaller than the amplitude of the second audio input signal, and the value of the first reference signal is larger than or equal to the value of the second reference signal.
2. The method for detecting a short-circuit and open-circuit of a speaker according to claim 1,
in the short circuit detection step, if the detection result signal under the short circuit detection condition represents that the driving signal is larger than the first reference signal, judging that the loudspeaker has a short circuit fault;
in the open circuit detection step, if the detection result signal under the open circuit detection condition represents that the driving signal is smaller than the second reference signal, the open circuit fault of the loudspeaker is judged.
3. The method according to claim 2, wherein the detection result signal output by the fault detection module in a default output state indicates that the driving signal is smaller than the preset reference signal;
the short circuit detection step further includes: after judging that the loudspeaker has a short-circuit fault, controlling the fault detection module to recover the default output state;
and/or the number of the groups of groups,
the open circuit detection step further includes: and after the loudspeaker is judged to not have the open circuit fault, controlling the fault detection module to recover the default output state.
4. A method for detecting a short-circuit open of a speaker according to any one of claims 1 to 3, comprising:
executing the short circuit detection step;
and when the speaker is judged not to have short circuit fault, executing the open circuit detection step.
5. The method of claim 1, wherein the first audio input signal is determined based on the first reference signal and a short circuit impedance threshold of the speaker.
6. The method of claim 5, wherein determining the first audio input signal comprises:
determining a first reference audio input signal corresponding to the short-circuit impedance threshold according to the first reference signal;
and selecting the audio input signal with the amplitude smaller than or equal to that of the first reference audio input signal as the first audio input signal.
7. The method of claim 1, wherein the second audio input signal is determined based on the second reference signal and an open impedance threshold of the speaker.
8. The method of claim 7, wherein the setting the second audio input signal comprises:
determining a second reference audio input signal corresponding to the open-circuit impedance threshold according to the second reference signal;
and selecting the audio input signal with the amplitude greater than or equal to the second reference audio input signal as the second audio input signal.
9. The method for detecting a short-circuit and open-circuit of a speaker according to claim 1, wherein the speaker failure detection system further comprises an upper computer;
the method for detecting the short-circuit and open-circuit of the loudspeaker further comprises the following steps:
when judging that the speaker has a short circuit fault, reporting the judging result to the upper computer as a speaker short circuit;
when judging that the loudspeaker has an open circuit fault, reporting a judgment result to the upper computer as the loudspeaker is open circuit;
and when judging that the loudspeaker has no short circuit fault and no open circuit fault, reporting the judgment result to the upper computer when the loudspeaker is in a normal state.
10. A speaker fault detection system, comprising: the device comprises a loudspeaker, a driving module, a fault detection module and a control module; the driving module is respectively connected with the loudspeaker and the fault detection module, and the control module is respectively connected with the driving module and the fault detection module; the control module is configured to perform the method for detecting a short-circuit open of a speaker according to any one of claims 1-9.
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