CN106028248B - Loudspeaker polarity detection method and device - Google Patents
Loudspeaker polarity detection method and device Download PDFInfo
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- CN106028248B CN106028248B CN201610644401.XA CN201610644401A CN106028248B CN 106028248 B CN106028248 B CN 106028248B CN 201610644401 A CN201610644401 A CN 201610644401A CN 106028248 B CN106028248 B CN 106028248B
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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
- H04R29/004—Monitoring arrangements; Testing arrangements for microphones
Abstract
The invention discloses a kind of loudspeaker polarity detection methods, including：Control is tested loudspeaker and sends out the corresponding sound of first audio signal；And while the tested loudspeaker stopping sends out first audio signal corresponding sound, controls and be tested loudspeaker and send out the corresponding sound of the second audio signal, the frequency of the frequency of first audio signal different from second audio signal；Third audio signal is received by microphone；The wherein described third audio signal is the audio signal that will be collected the above sound by the microphone and be converted into；The audio section of interception and the second audio signal same frequency from the third audio signal；By the audio section compared with the waveform phase of second audio signal, and judge whether the polarity connection of the tested loudspeaker is normal according to comparison result.Correspondingly, the invention also discloses a kind of loudspeaker device for detecting polarity, using the embodiment of the present invention, the case where capable of accurately detecting any of electronic equipment loudspeaker reverse polarity connection.
Description
Technical field
The present invention relates to Audiotechnica field more particularly to a kind of loudspeaker polarity detection method and devices.
Background technology
It is the loudspeaker wiring schematic diagram in the electronic equipment with loudspeaker, the anode and audible warning of left horn L referring to Fig. 1
Input terminal LOConnection, anode and the audible warning input terminal R of right horn ROThe cathode of connection, left horn L and right horn R are all grounded.
So-called loudspeaker reverse polarity connection, refers to just the plus earth of loudspeaker and the cathode of loudspeaker connects audible warning input terminal.
Loudspeaker device for detecting polarity currently on the market, left horn and right horn to electronic equipment input same sound simultaneously
Frequency input signal, and the sound of left horn is acquired by left microphone and acquires the sound of right horn by right microphone, in turn
By collected sound transitions at audio collection signal (it is waveform signal), the corresponding audio collection signal of comparison left horn and
Whether the phase of the waveform of the corresponding audio collection signal of right horn if opposite on the contrary, illustrate that there are one loudspeakers in two loudspeaker of left and right
Reverse polarity connection.The case where above-mentioned detection device is capable of detecting when left and right loudspeaker there are a loudspeaker reverse polarity connections, but due to working as
When the two loudspeaker polarity in left and right are reversed or normally connect, the corresponding audio collection signal of left horn and the corresponding sound of right horn
The phase of the waveform of frequency acquisition signal is identical, then when detecting the corresponding audio collection signal of left horn and right horn pair
It is reversed or just that two loudspeakers in left and right polarity of lying prone just cannot be distinguished when the phase of the waveform for the audio collection signal answered is identical
Often the case where connection, i.e., the detection scheme that above-mentioned detection device provides can not detect that the two loudspeaker polarity in left and right are reversed
Situation.
Invention content
A kind of loudspeaker polarity detection method of proposition of the embodiment of the present invention and device, can accurately detect in electronic equipment
The case where any one loudspeaker reverse polarity connection.
The present invention implement propose loudspeaker polarity detection method include：
It controls audio signal generator and generates the first audio signal, and control the audio signal generator by described first
Audio signal is sent to tested loudspeaker, so that the tested loudspeaker send out the first sound wave according to first audio signal；
Stop sending out the time point of the first sound wave in the tested loudspeaker, control audio-frequency generator generates the second audio letter
Number, and control the audio signal generator and second audio signal is sent to the tested loudspeaker, for described tested
Loudspeaker send out the second sound wave according to second audio signal；The frequency of first audio signal is believed different from second audio
Number frequency；
Third audio signal is received by microphone；The wherein described third audio signal will be collected by the microphone
First sound wave and the audio signal that is chronologically converted into of second sound wave；
The audio section of interception and the second audio signal same frequency from the third audio signal；
By the audio section compared with the waveform phase of second audio signal, and the quilt is judged according to comparison result
Whether the polarity connection for surveying loudspeaker is normal.
Further, it is described by the audio section compared with the waveform phase of second audio signal, and according to comparing
As a result judge whether the polarity connection of the tested loudspeaker is normal, specially：
Compare whether the audio section is consistent with the waveform phase of second audio signal；
If so, judging that the polarity connection of the tested loudspeaker is normal；
If it is not, then judging that the polarity connection of the tested loudspeaker is reversed.
Further, the loudspeaker polarity detection method further includes：
When judging that the polarity of the tested loudspeaker connects reversed, alarm control signal is generated；
Signal, which is controlled, according to the alarm makees alarming processing.
Still further, the frequency of first audio signal is higher than the frequency of second audio signal.
Further, first audio signal, second audio signal and the third audio signal are letter
Harmonic signal.
Correspondingly the embodiment of the present invention also provides a kind of loudspeaker device for detecting polarity, including：
First audio-frequency module generates the first audio signal for controlling audio signal generator, and controls the audio letter
First audio signal is sent to tested loudspeaker by number generator, so that the tested loudspeaker are according to first audio signal
Send out the first sound wave；
Second audio-frequency module at the time point for stopping sending out the first sound wave in the tested loudspeaker, controls audio
Device generates the second audio signal, and controls the audio signal generator and second audio signal is sent to the tested loudspeaker
, so that the tested loudspeaker send out the second sound wave according to second audio signal；The frequency of first audio signal is different
In the frequency of second audio signal；
Audio receiving module, for receiving third audio signal by microphone；The wherein described third audio signal be by
The audio signal that collected first sound wave and second sound wave are chronologically converted by the microphone；
Audio interception module, for the interception from the third audio signal and the second audio signal same frequency
Audio section；
Phase bits comparison module, for by the audio section compared with the waveform phase of second audio signal, and according to
Comparison result judges whether the polarity connection of the tested loudspeaker is normal.
Further, the phase bits comparison module specifically includes：
Comparing unit, it is for comparing that whether the audio section is consistent with the waveform phase of second audio signal；
First judging unit, for when the audio section is consistent with the waveform phase of the second audio signal, judging
The polarity connection of the tested loudspeaker is normal；
Second judgment unit, for when the waveform phase of the audio section and second audio signal is inconsistent, sentencing
The polarity connection of the disconnected tested loudspeaker is reversed.
Further, the loudspeaker device for detecting polarity further includes：
Alarm signal generation module, for when judging that the polarity of the tested loudspeaker connects reversed, generating alarm control
Signal；
Warning processing module makees alarming processing for controlling signal according to the alarm.
Still further, the frequency of first audio signal is higher than the frequency of second audio signal.
Further, first audio signal, second audio signal and the third audio signal are letter
Harmonic signal.
Implement the embodiment of the present invention, has the advantages that：
Loudspeaker polarity detection method provided in an embodiment of the present invention and device control tested loudspeaker and are continuously sending out the first sound
Wave for a period of time after, control be tested loudspeaker stopping send out the first sound wave and send out the second sound wave at once, wherein the first sound wave be by
The sound that first audio signal is converted into, the second sound wave are the sound being converted by the second audio signal, then microphone will receive
The first sound wave arrived and the second sound wave convert third audio signal, this third audio signal includes an identifier, as with first
The wave band of audio signal same frequency and critical point with the wave band of the second audio signal same frequency, to when being opened from critical point
When beginning to intercept the audio section with the second audio signal same frequency, the waveform of this audio section and the waveform of the second audio signal have
Same origin identification symbol, and then the position that can be accorded with based on this origin identification accurately judges whether the phase of two waveforms is consistent, from
And it can directly and accurately judge whether the polarity connection of tested loudspeaker is normal.
Description of the drawings
Fig. 1 is the loudspeaker wiring schematic diagram in the electronic equipment with loudspeaker；
Fig. 2 is the flow diagram of one embodiment of loudspeaker polarity detection method provided by the invention；
Fig. 3 is the structural schematic diagram of one embodiment of loudspeaker polarity detection system provided by the invention；
Fig. 4 is the structural schematic diagram of one embodiment of loudspeaker device for detecting polarity provided by the invention；
Fig. 5 is the structural representation of one embodiment of the phase bits comparison module of loudspeaker device for detecting polarity provided by the invention
Figure.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
It is the flow diagram of one embodiment of loudspeaker polarity detection method provided by the invention, the loudspeaker referring to Fig. 2
Polarity detection method is executed by processor, including step S1 to S5, specific as follows：
S1, control audio signal generator generate the first audio signal, and controlling the audio signal generator will be described
First audio signal is sent to tested loudspeaker, so that the tested loudspeaker send out the first sound wave according to first audio signal；
S2 stops sending out the time point of the first sound wave in the tested loudspeaker, and control audio-frequency generator generates the second audio
Signal, and control the audio signal generator and second audio signal is sent to the tested loudspeaker, for the quilt
It surveys loudspeaker and the second sound wave is sent out according to second audio signal；The frequency of first audio signal is different from second audio
The frequency of signal；
S3 receives third audio signal by microphone；The wherein described third audio signal will be adopted by the microphone
The audio signal that first sound wave and second sound wave collected is chronologically converted into；
S4, the audio section of interception and the second audio signal same frequency from the third audio signal；
S5 by the audio section compared with the waveform phase of second audio signal, and judges institute according to comparison result
Whether the polarity connection for stating tested loudspeaker is normal.
The loudspeaker polarity detection method of above-mentioned offer controls and is tested loudspeaker after continuously sending out the first sound wave for a period of time,
Continue to control tested loudspeaker stopping to send out the first sound wave and send out the second sound wave at once, wherein the first sound wave is by the first audio
The sound that signal is converted into, the second sound wave are the sound being converted by the second audio signal, the first sound that microphone will receive
Wave and the second sound wave convert third audio signal, this third audio signal includes an identifier, i.e., same with the first audio signal
The wave band of frequency and critical point with the wave band of the second audio signal same frequency, to when from third audio signal interception with
When the audio section of the second audio signal same frequency, the waveform of the waveform of this audio section and the second audio signal has same starting
Identifier, and then the position that can be accorded with based on this origin identification accurately judges whether the phase of two waveforms is consistent, to directly accurate
Really judge whether the polarity connection of tested loudspeaker is normal.
In addition, after receiving third audio signal by microphone, it is also necessary to carry out noise reduction to third audio signal
Processing reduces influence of the external noise to third audio signal.
Further, the specific implementation process of above-mentioned steps S5 is：
Compare whether the audio section is consistent with the waveform phase of second audio signal；
If so, judging that the polarity connection of the tested loudspeaker is normal；
If it is not, then judging that the polarity connection of the tested loudspeaker is reversed.
It should be noted that the waveform of the audio section and both second audio signals that are intercepted at this time is with same
Origin is originated, then can directly and accurately judge whether the phase between two waveforms is consistent.
Further, when detecting that the polarity connection by loudspeaker is reversed, the amount at corresponding alarm that can carry out is handled,
Thus the loudspeaker polarity detection method further includes：
When judging that the polarity of the tested loudspeaker connects reversed, alarm control signal is generated；
Signal, which is controlled, according to the alarm makees alarming processing.
Alarming processing is there are many mode, as a kind of preferred embodiment, when detecting that the polarity connection of tested loudspeaker is reversed
When, processor produces alarm control signal control alarm lamp and carries out highlighted flicker alarm, or one alarm loudspeaker of control
Beep and alarm, and carry out showing current testing result when control display.
Preferably, the frequency of first audio signal is higher than the frequency of second audio signal.
It should be noted that since purpose of the first audio signal of setting before the second audio signal is in order to from the
The audio section with the second audio signal same frequency is accurately intercepted in three audio signals, then needing the frequency of the first audio signal
Rate will be different from the frequency of the second audio signal, and the preferably frequency of the first audio signal is the several of the frequency of the second audio signal
Times, and the frequency of the second audio signal is preferably low frequency, such as 100Hz, low frequency signal is conducive to judge the phase of waveform.In addition,
The frequency of first audio signal and the second audio signal need to be within the Hz-KHz of tested loudspeaker.
Preferably, first audio signal, second audio signal and the third audio signal are monochromatic wave
Signal, but it is not limited to monochromatic wave signal, further include other waveform signals, such as square wave.
Below by use the first audio signal for the sine wave signal of 10000Hz, the second audio signal be 100Hz just
Whether string wave signal is normal as an example come the polarity connection for detecting any of television set 03 loudspeaker, the loudspeaker provided in conjunction with Fig. 3
The structural schematic diagram of one embodiment of polarity detection system, is illustrated：
Step 1：Loudspeaker device for detecting polarity and tested television set 03 are placed in quiet room, so that detection device passes through
Microphone 04 receives sound (above-mentioned first sound wave and the second sound wave) that the loudspeaker of tested television set 03 are sent out by external interference
It is smaller；Microphone 04 is placed on the loudspeaker (by taking the loudspeaker of right channel as an example) of tested television set 03 currently, to acquire loudspeaker
The sound sent out.
Step 2：By audio input end (such as HDMI of the audio signal output end of audio signal generator 02 and television set 03
Port or USB port) connection.
Step 3：Control 02 output frequency of audio signal generator of processor 01 is the sine wave of 10000Hz as the first sound
The loudspeaker of frequency signal, tested television set 03 cause the vibration of diaphragm under the action of first audio signal, send out the first sound wave
Sound, after continuously sending out for the first sound wave certain time, processor 01 control audio signal generator 02 stop output
While first audio signal, processor 01 controls audio signal generator 02 and starts the sine wave work that output frequency is 100Hz
Loudspeaker stopping for the second audio signal, tested television set 03 sends out the first sound wave, at the same time in the work of the second audio signal
The vibration for causing diaphragm under sends out the sound of the second sound wave.
Step 4：Processor 01 controls microphone while control audio signal generator 02 exports above-mentioned audio signal
04 acquisition is tested the sound (sound for acquiring above-mentioned first sound wave and the second sound wave) that the loudspeaker of television set 03 are sent out, Mike
Collected sound is converted into third audio signal and sends processor 01 to by wind 04.
Step 5：Processor 01 carries out noise reduction process to the third audio signal received, from the third audio signal
Start to intercept subsequent audio section with the band end point of the first audio signal same frequency and be determined further.
Step 6：Judge intercepted audio section and whether the waveform phase of second audio signal is consistent (also can determine whether
Whether the audio section of the interception is sine waveform), when the waveform of the audio section and second audio signal of the interception
When phase is inconsistent (when it is not sine waveform but cosine wave waveform that the audio section intercepted, which is), then judge to be tested TV
The loudspeaker polarity connection of machine 03 is reversed, and executes step 7；And work as the waveform of intercepted audio section and second audio signal
When phase is consistent (when the audio section intercepted be sine waveform when), then sentence write tested television set 03 loudspeaker polarity connection just
Often.
Step 7：When detecting that the loudspeaker polarity connection of tested television set 03 is reversed, control alarm lamp 05 is alarmed.
It should be noted that the process of the example above is detected the same loudspeaker for being tested television set, if detection quilt
The polarity connection for surveying the left and right sides loudspeaker of television set, can be respectively set left and right microphone, respectively the left side to receiving
Third audio signal and right side third audio signal are detected, and detecting step is similar with above-mentioned detection process, herein no longer
It repeats.
Loudspeaker polarity detection method provided in an embodiment of the present invention controls tested loudspeaker and is continuously sending out one section of the first sound wave
After time, controls tested loudspeaker stopping and send out the first sound wave and send out the second sound wave at once, wherein the first sound wave is by the first sound
The sound that frequency signal is converted into, the second sound wave are the sound being converted by the second audio signal, then microphone will receive
One sound wave and the second sound wave convert third audio signal, this third audio signal includes an identifier, is as believed with the first audio
The wave band of number same frequency and the critical point with the wave band of the second audio signal same frequency, to when being intercepted since critical point
When with the audio section of the second audio signal same frequency, the waveform of the waveform of this audio section and the second audio signal has with together
Beginning identifier, and then the position that can be accorded with based on this origin identification accurately judges whether the phase of two waveforms is consistent, so as to
Directly and accurately judge whether the polarity connection of tested loudspeaker is normal.
It is the structural schematic diagram of one embodiment of loudspeaker device for detecting polarity provided by the invention, the detection referring to Fig. 4
Device can realize that the whole flows for the loudspeaker polarity detection method that above-described embodiment provides, the detection device are that floppy disk system is arranged
In processor, the loudspeaker device for detecting polarity, including：
First audio-frequency module 10 generates the first audio signal for controlling audio signal generator, and controls the audio
First audio signal is sent to tested loudspeaker by signal generator, so that the tested loudspeaker are believed according to first audio
Number send out the first sound wave；
Second audio-frequency module 20, the time point for stopping sending out the first sound wave in the tested loudspeaker, control audio hair
Raw device generates the second audio signal, and controls the audio signal generator and second audio signal is sent to described be tested
Loudspeaker, so that the tested loudspeaker send out the second sound wave according to second audio signal；The frequency of first audio signal
Different from the frequency of second audio signal；
Audio receiving module 30, for receiving third audio signal by microphone；The wherein described third audio signal is
The audio signal for being chronologically converted into collected first sound wave and second sound wave by the microphone；
Audio interception module 40, for the interception from the third audio signal and the second audio signal same frequency
Audio section；
Phase bits comparison module 50, for by the audio section compared with the waveform phase of second audio signal, and root
Judge whether the polarity connection of the tested loudspeaker is normal according to comparison result.
Further, as shown in figure 5, Fig. 5 is the phase bits comparison module of loudspeaker device for detecting polarity provided by the invention
The structural schematic diagram of one embodiment, the phase bits comparison module 50 specifically include：
Comparing unit 51, it is for comparing that whether the audio section is consistent with the waveform phase of second audio signal；
First judging unit 52, for when the audio section is consistent with the waveform phase of the second audio signal, sentencing
The polarity connection of the disconnected tested loudspeaker is normal；
Second judgment unit 53 is used for when the waveform phase of the audio section and second audio signal is inconsistent,
Judge that the polarity connection of the tested loudspeaker is reversed.
Further, the loudspeaker device for detecting polarity further includes：
Alarm signal generation module 60, for when judging that the polarity of the tested loudspeaker connects reversed, generating alarm control
Signal processed；
Warning processing module 70 makees alarming processing for controlling signal according to the alarm.
Still further, the frequency of first audio signal is higher than the frequency of second audio signal.
Further, first audio signal, second audio signal and the third audio signal are letter
Harmonic signal.
Loudspeaker device for detecting polarity provided in an embodiment of the present invention is tested loudspeaker in control and is continuously sending out the first sound wave one
After the section time, controls tested loudspeaker stopping and send out the first sound wave and send out the second sound wave at once, wherein the first sound wave is by first
The sound that audio signal is converted into, the second sound wave be the sound being converted by the second audio signal, then microphone will receive
First sound wave and the second sound wave convert third audio signal, this third audio signal includes an identifier, as with the first audio
The wave band of signal same frequency and critical point with the wave band of the second audio signal same frequency, to when being cut since critical point
When taking the audio section with the second audio signal same frequency, the waveform of the waveform of this audio section and the second audio signal is with same
Origin identification accords with, and then the position that can be accorded with based on this origin identification accurately judges whether the phase of two waveforms is consistent, so as to
Whether the polarity connection directly and accurately to judge tested loudspeaker is normal.
One of ordinary skill in the art will appreciate that realizing all or part of flow in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the program can be stored in a computer read/write memory medium
In, the program is when being executed, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (10)
1. a kind of loudspeaker polarity detection method, which is characterized in that including：
It controls audio signal generator and generates the first audio signal, and control the audio signal generator by first audio
Signal is sent to tested loudspeaker, so that the tested loudspeaker send out the first sound wave according to first audio signal；
Stopping sending out the time point of the first sound wave in the tested loudspeaker, control audio-frequency generator generates the second audio signal, and
It controls the audio signal generator and second audio signal is sent to the tested loudspeaker, for the tested loudspeaker root
The second sound wave is sent out according to second audio signal；Frequency of the frequency of first audio signal different from second audio signal
Rate；
Third audio signal is received by microphone；The wherein described third audio signal is by the microphone by collected institute
State the audio signal that the first sound wave and second sound wave are chronologically converted into；
The audio section of interception and the second audio signal same frequency from the third audio signal；
By the audio section compared with the waveform phase of second audio signal, and the tested loudspeaker is judged according to comparison result
Whether the connection of polarity is normal.
2. loudspeaker polarity detection method as described in claim 1, which is characterized in that described by the audio section and described second
The waveform phase of audio signal compares, and judges whether the polarity connection of the tested loudspeaker is normal according to comparison result, specifically
For：
Compare whether the audio section is consistent with the waveform phase of second audio signal；
If so, judging that the polarity connection of the tested loudspeaker is normal；
If it is not, then judging that the polarity connection of the tested loudspeaker is reversed.
3. loudspeaker polarity detection method as claimed in claim 2, which is characterized in that further include：
When judging that the polarity of the tested loudspeaker connects reversed, alarm control signal is generated；
Signal, which is controlled, according to the alarm makees alarming processing.
4. loudspeaker polarity detection method as described in claim 1, which is characterized in that the frequency of first audio signal is higher than
The frequency of second audio signal.
5. loudspeaker polarity detection method as described in claim 1, which is characterized in that first audio signal, described second
Audio signal and the third audio signal are monochromatic wave signal.
6. a kind of loudspeaker device for detecting polarity, which is characterized in that including：
First audio-frequency module generates the first audio signal for controlling audio signal generator, and controls the audio signal hair
First audio signal is sent to tested loudspeaker by raw device, so that the tested loudspeaker are sent out according to first audio signal
First sound wave；
Second audio-frequency module, the time point for stopping sending out the first sound wave in the tested loudspeaker, control audio-frequency generator life
At the second audio signal, and controls the audio signal generator and second audio signal is sent to the tested loudspeaker,
So that the tested loudspeaker send out the second sound wave according to second audio signal；The frequency of first audio signal is different from institute
State the frequency of the second audio signal；
Audio receiving module, for receiving third audio signal by microphone；The wherein described third audio signal is by described
The audio signal that collected first sound wave and second sound wave are chronologically converted by microphone；
Audio interception module, the audio for interception and the second audio signal same frequency from the third audio signal
Section；
Phase bits comparison module, for by the audio section compared with the waveform phase of second audio signal, and according to comparing
As a result judge whether the polarity connection of the tested loudspeaker is normal.
7. loudspeaker device for detecting polarity as claimed in claim 6, which is characterized in that the phase bits comparison module specifically includes：
Comparing unit, it is for comparing that whether the audio section is consistent with the waveform phase of second audio signal；
First judging unit is used for when the audio section is consistent with the waveform phase of the second audio signal, described in judgement
The polarity connection of tested loudspeaker is normal；
Second judgment unit, for when the waveform phase of the audio section and second audio signal is inconsistent, judging institute
The polarity connection for stating tested loudspeaker is reversed.
8. loudspeaker device for detecting polarity as claimed in claim 7, which is characterized in that further include：
Alarm signal generation module, for when judging that the polarity of the tested loudspeaker connects reversed, generating alarm control signal；
Warning processing module makees alarming processing for controlling signal according to the alarm.
9. loudspeaker device for detecting polarity as claimed in claim 6, which is characterized in that the frequency of first audio signal is higher than
The frequency of second audio signal.
10. loudspeaker device for detecting polarity as claimed in claim 9, which is characterized in that first audio signal, described second
Audio signal and the third audio signal are monochromatic wave signal.
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| CN107172557B (en) * | 2017-06-02 | 2020-01-07 | 北京小米移动软件有限公司 | Method and device for detecting polarity of loudspeaker and receiver |
| CN110033788B (en) * | 2019-04-02 | 2021-06-15 | 上海帆声图像科技有限公司 | Sound detection method, device and system of display equipment |
| CN111065038A (en) * | 2019-12-31 | 2020-04-24 | 深圳市潮流网络技术有限公司 | Method for detecting polarity of loudspeaker of multi-loudspeaker equipment, corresponding equipment and conference system |
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| JPH06311578A (en) * | 1993-04-19 | 1994-11-04 | Clarion Co Ltd | Speaker polarity deciding method in audio system |
| CN1248880A (en) * | 1998-09-22 | 2000-03-29 | 雅马哈株式会社 | Loudspeak polarity judging circuit and audio circuit with function of polarity judging and switching |
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