CN101931851A - Loudspeaker polarity testing arrangement - Google Patents

Loudspeaker polarity testing arrangement Download PDF

Info

Publication number
CN101931851A
CN101931851A CN2009100405007A CN200910040500A CN101931851A CN 101931851 A CN101931851 A CN 101931851A CN 2009100405007 A CN2009100405007 A CN 2009100405007A CN 200910040500 A CN200910040500 A CN 200910040500A CN 101931851 A CN101931851 A CN 101931851A
Authority
CN
China
Prior art keywords
resistor
comparator
circuit
capacitor
polarity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN2009100405007A
Other languages
Chinese (zh)
Other versions
CN101931851B (en
Inventor
刘洪军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Minami Electroacoustic Co Ltd
Original Assignee
Minami Electronic Industry Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Minami Electronic Industry Co ltd filed Critical Minami Electronic Industry Co ltd
Priority to CN200910040500.7A priority Critical patent/CN101931851B/en
Publication of CN101931851A publication Critical patent/CN101931851A/en
Application granted granted Critical
Publication of CN101931851B publication Critical patent/CN101931851B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Circuit For Audible Band Transducer (AREA)

Abstract

The invention discloses a loudspeaker polarity testing device which comprises a single chip microcomputer, a left sound channel output control circuit, a left microphone front voltage amplifying circuit, a left power amplifying circuit, a left zero-crossing comparing circuit, a right sound channel output control circuit, a right microphone front voltage amplifying circuit, a right power amplifying circuit, a right zero-crossing comparing circuit, an alarm circuit, a keyboard control/function conversion circuit and a power supply circuit. The invention can conveniently detect whether the earphone has the problem that the left loudspeaker and the right loudspeaker are reversely connected and whether the polarity of a single loudspeaker is reversely connected, and is beneficial to improving the delivery quality of the loudspeaker.

Description

A kind of polarity testing device of horns
[technical field]
The present invention relates to a kind of polarity testing device of horns.
[background technology]
Referring to Fig. 1, be the loudspeaker wiring schematic diagram in the earphone, the positive pole of left horn L and left horn signal input part L 0Connect the positive pole of right horn R and right horn signal input part R 0Connect, the negative pole of left horn L and right horn R is ground connection all.So-called left and right loudspeaker connect instead, just are meant positive pole and the right horn signal input part R of left horn L 0Positive pole and the left horn signal input part L of connection, right horn R 0Connect, and the negative pole of left horn L and right horn R ground connection all; So-called loudspeaker polarity connects instead, with regard to the plus earth that is meant loudspeaker and the negative pole of loudspeaker connects the audible warning input.
Loudspeaker polarity tester in the market, all be monaural, the loudspeaker polarity tester does not have the ability that left and right loudspeaker connect anti-judgement like this, therefore, mass-produced earphone, even left and right loudspeaker have connect instead, test to come out with existing loudspeaker polarity tester yet, can not ensure the quality of earphone product like this.
Have again, existing loudspeaker polarity tester is judged polarity, be the voice signal of loudspeaker output and standard signal to be carried out amplitude ratio come to judge roughly loudspeaker polarity, therefore, this loudspeaker polarity tester can't be judged the voice signal of loudspeaker output and the phase difference between the standard signal exactly.In order to address the above problem, the applicant has designed the present invention.
[summary of the invention]
The present invention has overcome the deficiency of above-mentioned technology, provides a kind of and can judge that left and right loudspeaker connect instead, judges the signal of loudspeaker output and the polarity testing device of horns of the phase difference between the standard signal exactly.
For achieving the above object, the present invention has adopted following technical proposal:
A kind of polarity testing device of horns, it includes
Single-chip microcomputer produces square-wave signal output;
The L channel output control circuit, to delivering to tested left horn after the square-wave signal arrangement, left horn causes the vibration of diaphragm under this signal effect, form the acoustic matrix signal;
Left side microphone becomes sine wave signal with the sound conversion of signals of shaking;
Left side microphone forward voltage amplifying circuit, offset of sinusoidal ripple signal carries out voltage amplification;
Left side power amplification circuit, the signal that left microphone forward voltage amplifying circuit is exported carries out the electric current amplification;
Left side zero passage comparison circuit, sine wave signal to left power amplification circuit output carries out the positive-negative half-cycle separation, form the two-way square-wave signal and input to single-chip microcomputer, whether described single-chip microcomputer is with two-way square wave and the inner square wave that produces relatively and judge this tested loudspeaker polarity and connect instead;
The R channel output control circuit, to delivering to tested right horn after the arrangement of single-chip microcomputer generation square-wave signal, right horn causes the vibration of diaphragm under this signal effect, form the acoustic matrix signal;
Right microphone becomes sine wave signal with the sound conversion of signals of shaking;
Right microphone forward voltage amplifying circuit, offset of sinusoidal ripple signal carries out voltage amplification;
Right power amplification circuit, the signal that right microphone forward voltage amplifying circuit is exported carries out the electric current amplification;
Right zero passage comparison circuit, sine wave signal to right power amplification circuit output carries out the positive-negative half-cycle separation, form the two-way square-wave signal and input to single-chip microcomputer, whether described single-chip microcomputer is with two-way square wave and the inner square wave that produces relatively and judge this tested loudspeaker polarity and connect instead;
Warning circuit connects anti-and left horn and right horn connect anti-the warning to left and right loudspeaker polarity.
Compared with prior art, the invention has the beneficial effects as follows:
1, the left and right loudspeaker when earphone connect inverse time, go to detect with this device, with the L channel output control circuit in this device to the anodal input signal of left horn, if the right microphone of this device detects voice signal, this device just judges that left and right loudspeaker connect instead, therefore, removes to detect mass-produced earphone product with this device, whether have left and right loudspeaker connect anti-problem, to improve the outgoing of earphone if can detect earphone easily.
2, this device can be judged the voice signal of loudspeaker output and the phase difference between the standard signal exactly.
3, this device has warning circuit, can make corresponding warning to the testing result of loudspeaker in time, deals with in time with the testing staff of announcement.
[description of drawings]
Fig. 1 is the loudspeaker wiring schematic diagram in the earphone;
Fig. 2 is a block diagram of the present invention;
Fig. 3 is circuit theory diagrams of the present invention;
Signal series of drawing when Phase delay appears in the loudspeaker that Fig. 4 detects for the present invention; Divide 5 subgraphs, first is the square wave (in-phase pulse sequence) that single-chip microcomputer produces; Second is the sine wave that forms through after microphone forward voltage amplifying circuit and twice amplification of power amplification circuit; The 3rd is the first comparison square wave that sinusoidal wave positive half period is converted to by the zero passage comparison circuit; The 4th is the second comparison square wave that sinusoidal wave negative half-cycle is converted to by the zero passage comparison circuit; The 5th be with first relatively square wave, second relatively square wave simultaneously with first square wave phase difference square wave of forming of back relatively.
Fig. 5 the signal series of drawing that polarity connects inverse time occurs for the loudspeaker that the present invention detects.
[embodiment]
Be described in further detail below in conjunction with accompanying drawing and embodiments of the present invention:
Referring to Fig. 2-5, the present invention introduces a kind of polarity testing device of horns, and it includes: single-chip microcomputer 1, L channel output control circuit 2, left microphone 3, left microphone forward voltage amplifying circuit 4, left side power amplification circuit 5, left zero passage comparison circuit 6, R channel output control circuit 7, right microphone 8, right microphone forward voltage amplifying circuit 9, right power amplification circuit 10, right zero passage comparison circuit 11, warning circuit, Keyboard Control/function conversion circuit 13, power circuit 14.
The model of described single-chip microcomputer 1 is ATmega8, and it can produce the 1st square-wave signal among Fig. 4 that frequency is 1KZ (can certainly be other frequency), is reference square wave with this square-wave signal, and other signal and this signal compare.This reference square wave passes through pin
Figure B2009100405007D0000041
Export to L channel output control circuit 2, pass through pin
Figure B2009100405007D0000042
Export to R channel output control circuit 7.Single-chip microcomputer 1 also can receive through left zero passage comparison circuit 6 or right zero passage comparison circuit 11 and handle two-way that the back forms such as the 3rd and the 4th square-wave signal among Fig. 4, this two-way square wave while and reference square wave signal is relatively obtained the phase difference square wave of the 5th of Fig. 4.
Deliver to tested left horn after 2 pairs of square-wave signal arrangements of L channel output control circuit, L channel output control circuit 2 includes resistance R 1029, R1050, R1030, R1052, switch S 1000, S1001, S1002, capacitor C 1006, C1002 and triode U1009.Described resistance R 1,029 one ends are connected the back as L channel output control circuit 2 inputs and single-chip microcomputer 1 pin with capacitor C 1,006 one ends
Figure B2009100405007D0000051
Connect, resistance R 1029 other end ground connection, capacitor C 1006 other ends are connected respectively with the end of resistance R 1050, R1030, R1052, the other end of resistance R 1050, R1030, R1052 all is connected with switch S 1000, S1001, S1002, the other end of switch S 1000, S1001, S1002 all is connected with an end and the triode U1009 base stage of capacitor C 1002, the other end ground connection of capacitor C 1002, the grounded emitter of triode U1009.When detecting loudspeaker, the left horn negative pole of earphone can be connected with the collector electrode of triode U1009, the left horn positive pole of earphone is connected with power supply VCC.Left horn causes the vibration (positive pole causes that diaphragm outwards vibrates, and negative pole causes that diaphragm is to internal vibration) of diaphragm under this square-wave signal effect, form the acoustic matrix signal.
The acoustic matrix signal that left side microphone 3 typings should tested left horn be exported, and convert sine wave signal to and be defeated by left microphone forward voltage amplifying circuit 4.
Left side microphone forward voltage amplifying circuit 4 offset of sinusoidal ripple signals carry out voltage amplification; Left side microphone forward voltage amplifying circuit 4 includes resistance R 1000, R1002, R1004, R1006, capacitor C 1000, C1004, C1008, C1009, C1012, and comparator U1000A.Resistance R 1000, input as this circuit after one end of resistance R 1002 and capacitor C 1000 links together is connected with left microphone 3, the other end of resistance R 1000 and capacitor C 1,004 one ends are connected with+5V power supply, capacitor C 1004 other end ground connection, the other end of resistance R 1002 is connected with comparator U1000A inverting input by capacitor C 1008, the other end ground connection of capacitor C 1000, comparator U1000A in-phase input end connects+the 5V power supply by capacitor C 1012, comparator U1000A output is successively by capacitor C 1009, resistance R 1004 ground connection, contact between capacitor C 1009 and the resistance R 1004 is connected with contact between resistance R 1002 and the capacitor C 1008, resistance R 1,006 one ends are connected with comparator U1000A inverting input, and resistance R 1006 other ends are connected with comparator U1000A output.
The signal of 5 pairs of left microphone forward voltage amplifying circuit 4 outputs of left side power amplification circuit carries out electric current and amplifies; Left side power amplification circuit 5 includes resistance R 1008, R1010, R1012, R1014, R1016, R1018, capacitor C 1016, C1018, C1019, C1013 and comparator U1000B.The in-phase input end of described comparator U1000B is connected with+5V power supply by resistance R 1012, be connected with comparator U1000A in-phase input end simultaneously, the inverting input of comparator U1000B is successively by capacitor C 1018, resistance R 1008, capacitor C 1016 is connected with comparator U1000A output, resistance R 1,010 one ends be connected with capacitor C 1,019 one ends the back with capacitor C 1018 and resistance R 1008 between contact be connected, resistance R 1010 other end ground connection, capacitor C 1019 other ends are connected the back and are connected with comparator U1000B output with resistance R 1,018 one ends, resistance R 1018 other end ground connection, resistance R 1,014 one ends are connected the back and are connected with comparator U1000B in-phase input end with capacitor C 1,013 one ends, resistance R 1014 other ends and capacitor C 1013 other ends are ground connection all, resistance R 1,016 one ends are connected with the inverting input of comparator U1000B, and resistance R 1016 other ends are connected with comparator U1000B output.Referring to Fig. 4, the sine wave among the figure is by the microphone typing, forms through comparator U1000A, twice amplification of U1000B, and through the processing of circuit in the loudspeaker, sine wave signal is compared with square-wave signal and moved an angle after phase place has taken place.After move that to reach 180 be that the polarity of loudspeaker connects anti-when spending.
The sine wave signal of 6 pairs of left power amplification circuit 5 outputs of left side zero passage comparison circuit carries out positive-negative half-cycle separation formation two-way square-wave signal and inputs to single-chip microcomputer 1.Described left zero passage comparison circuit 6 includes resistance R 1020, R1022, R1023, R1024, R1034, R1035, R1036, R1037, R1038, R1039, R1044, zero-crossing comparator U1001A, U1001B.Described resistance R 1,020 one ends are connected with comparator U1000B output, and resistance R 1020 other ends are connected with the inverting input of zero-crossing comparator U1001A by resistance R 1037, are connected with the in-phase input end of zero-crossing comparator U1001B by resistance R 1036 simultaneously; The in-phase input end of zero-crossing comparator U1001A all is connected with resistance R 1,034 one ends with resistance R 1,022 one ends, resistance R 1022 another termination+5V power supplys, resistance R 1034 other end ground connection, the output of zero-crossing comparator U1001A all is connected with resistance R 1,038 one ends with resistance R 1,023 one ends, resistance R 1023 other end ground connection, resistance R 1038 other end PC 0As isolated positive half cycle square wave output, the pin of this output and single-chip microcomputer 1
Figure B2009100405007D0000071
Connect.The inverting input of zero-crossing comparator U1001B all is connected with resistance R 1,044 one ends with resistance R 1,035 one ends, resistance R 1044 another termination+5V power supplys, resistance R 1035 other end ground connection; The output of zero-crossing comparator U1001B all is connected with resistance R 1,039 one ends with resistance R 1,024 one ends, resistance R 1024 other end ground connection, resistance R 1039 other end PC 1As isolated negative half period square wave output, the pin of this output and single-chip microcomputer 1
Figure B2009100405007D0000072
Connect.The comparator U1001A of left side zero passage comparison circuit 6 converts the sine wave of positive half period among Fig. 4 first comparison square wave (i.e. the 3rd signal graph), is defeated by the pin of single-chip microcomputer 1 then
Figure B2009100405007D0000073
The comparator U1001B of left side zero passage comparison circuit 6 converts the sine wave of negative half-cycle among Fig. 4 second comparison square wave (i.e. the 4th signal graph), is defeated by the pin of single-chip microcomputer 1 then
Figure B2009100405007D0000074
Deliver to right tested loudspeaker after 7 pairs of square-wave signal arrangements of R channel output control circuit, this circuit includes resistance R 1031, R1051, R1032, R1053, switch S 1003, S1004, S1005, capacitor C 1007, C1003 and triode U1010.The circuit connection structure of this circuit is identical with L channel output control circuit 2, referring to Fig. 2, is not described in detail at this.When detecting loudspeaker, the right horn negative pole of earphone can be connected with the collector electrode of triode U1010, the right horn positive pole of earphone is connected with power supply VCC.Right horn causes the vibration (positive pole causes that diaphragm outwards vibrates, and negative pole causes that diaphragm is to internal vibration) of diaphragm under this square-wave signal effect, form the acoustic matrix signal.
The acoustic matrix signal that right microphone 8 typings should tested right horn be exported, and convert sine wave to and be defeated by right microphone forward voltage amplifying circuit 9.
Right microphone forward voltage amplifying circuit 9 offset of sinusoidal ripple signals carry out voltage amplification, right microphone forward voltage amplifying circuit 9 includes resistance R 1001, R1003, R1005, R1007, capacitor C 1001, C1005, C1010, C1011, C1014, and comparator U1002A.Input as this circuit after one end of resistance R 1001, resistance R 1003 and capacitor C 1001 links together is connected with right microphone.This circuit has identical circuit connection structure with left microphone forward voltage amplifying circuit 4, referring to Fig. 2, is not described in detail at this.
The signal of 10 pairs of right microphone forward voltage amplifying circuit 9 outputs of right power amplification circuit carries out electric current and amplifies, right power amplification circuit 10 includes resistance R 1009, R1011, R1013, R1015, R1017, R1019, capacitor C 1017, C1020, C1021, C1015 and comparator U1002B.The circuit connection structure of this circuit is identical with left power amplification circuit, syndeton between this circuit and the right microphone forward voltage amplifying circuit is identical with syndeton between left power amplification circuit and the microphone forward voltage amplifying circuit, is not described in detail at this.Right power amplification circuit 10 produces as the sine wave among Fig. 4.
The sine wave signal of 11 pairs of right power amplification circuit 10 outputs of right zero passage comparison circuit carries out positive-negative half-cycle separation formation two-way square-wave signal and inputs to single-chip microcomputer 1, right zero passage comparison circuit 11 includes resistance R 1021, R1022, R1025, R1026, R1034, R1035, R1040, R1041, R1042, R1043, R1044, zero-crossing comparator U1003A, U1003B.Described resistance R 1,021 one ends are connected with comparator U1002B output, and resistance R 1021 other ends are connected with the inverting input of zero-crossing comparator U1003A by resistance R 1040, are connected with the in-phase input end of zero-crossing comparator U1003B by resistance R1041 simultaneously; The in-phase input end of zero-crossing comparator U1003A all is connected with resistance R 1,034 one ends with resistance R 1,022 one ends, resistance R 1022 another termination+5V power supplys, resistance R 1034 other end ground connection, the output of zero-crossing comparator U1003A all is connected with resistance R 1,042 one ends with resistance R 1,025 one ends, resistance R 1025 other end ground connection, resistance R 1042 other end PC 2As isolated positive half cycle square wave output, the pin of this output and single-chip microcomputer 1
Figure B2009100405007D0000091
Connect.The inverting input of zero-crossing comparator U1003B all is connected with resistance R 1,044 one ends with resistance R 1,035 one ends, resistance R 1044 another termination+5V power supplys, resistance R 1035 other end ground connection; The output of zero-crossing comparator U1003B all is connected with resistance R 1,043 one ends with resistance R 1,026 one ends, resistance R 1026 other end ground connection, resistance R 1043 other end PC 3As isolated negative half period square wave output, the pin of this output and single-chip microcomputer 1
Figure B2009100405007D0000092
Connect.Zero-crossing comparator U1003B can produce the 3rd square wave among Fig. 4, and zero-crossing comparator U1003B can produce the 4th square wave among Fig. 4.
Described warning circuit connects anti-to left and right loudspeaker polarity and left horn and right horn connect anti-the warning.Described warning circuit includes LED warning circuit 15 and sound warning circuit 16.LED warning circuit 15 includes four light-emitting diode D1004, D1005, D1006, D1007, and wherein light-emitting diode D1004, D1006 can glow, and light-emitting diode D1005, D1007 can green light; The positive pole of light-emitting diode D1004, D1005, D1006, D1007 respectively the pin by resistance R 1045, R1046, R1047, R1048 and single-chip microcomputer 1 2., 3., 4., 5. be connected, the negative pole of light-emitting diode D1004, D1005, D1006, D1007 is distinguished ground connection.
Audible alarm circuit 16 includes buzzer SPK1000 and triode U1008, the input termination power VCC of buzzer SPK1000, the other end is connected with the collector electrode of triode U1008, the grounded emitter of triode U1008, the base stage of triode U1008 is by the pin of resistance R 1049 with single-chip microcomputer 1 Connect.When a left side or R channel polarity do not connect inverse time, light-emitting diode D1005 or D1007 carry out the green light indication, and buzzer sends " dripping " simultaneously; If the polarity of a left side or R channel connects inverse time, light-emitting diode D1004 or D1006 glow to glimmer and indicate, and buzzer sends long sound simultaneously, leaves microphone up to tested loudspeaker, the detected blackout of microphone.If left and right sound channels connects instead, light-emitting diode D1004 or D1006 glow simultaneously to glimmer and indicate, and buzzer sends long sound simultaneously.
Keyboard Control/function conversion circuit 13 includes two hilted broadsword lists and puts switch S 1006, S1007, and wherein switch S 1006 is a list/dual track change over switch, one end ground connection, the pin of the other end and resistance R 1,033 one ends and single-chip microcomputer 1
Figure B2009100405007D0000102
All connect, resistance R 1033 other ends are connected with power supply VCC; When cut-off switch S1006, this device is a dual track, and promptly left and right sound channels can detect respectively; When Closing Switch S1006, this device is a monophony, and promptly left and right sound channels can only detect simultaneously.Switch S 1007 for just/the negative polarity change over switch, switch S 1,007 one end and power grounds, the pin of the other end and resistance R 1,028 one ends and single-chip microcomputer 1
Figure B2009100405007D0000103
All connect, resistance R 1028 other ends are connected with power supply VCC, and so-called positive polarity is exactly that polarity connection with loudspeaker just correctly is being judged as, and the polarity of loudspeaker is connect the anti-negative mode that is judged as, and are exactly the type of alarm of foregoing description.And negative polarity is just opposite with positivity, the polarity connection of loudspeaker correctly is judged as negative, and the polarity of loudspeaker is connect the anti-positive mode that is judged as, this kind mode, when a left side or R channel polarity connect inverse time, light-emitting diode D1005 or D1007 carry out the green light indication, and buzzer sends " dripping " simultaneously; If the polarity of a left side or R channel does not connect inverse time, light-emitting diode D1004 or D1006 glow to glimmer and indicate, and buzzer sends long sound simultaneously, leaves microphone up to tested loudspeaker, the detected blackout of microphone.If left and right sound channels connects instead, light-emitting diode D1004 and D1006 glow simultaneously to glimmer and indicate, and buzzer sends long sound simultaneously.
Power circuit 14 is commonplace circuit, here is not described in detail.
Introduce the operation principle of this device below in detail:
1, the loudspeaker polarity of dual track detects
Switch S 1006 is disconnected, make this device be in the dual track working method, switch S 1007 is disconnected, make this device be in the positive polarity judgment mode.Left horn negative pole with earphone is connected with the collector electrode of the triode U1009 of L channel then, be connected with power supply VCC the left horn of earphone is anodal, and with the close left microphone of left horn; The right horn negative pole of earphone is connected with the collector electrode of the triode U1010 of R channel, is connected with power supply VCC the right horn of earphone is anodal, and with the close right microphone of right horn.Detect earlier left horn, single-chip microcomputer 1 produces among Fig. 4 that frequency is 1KZ the 1st square-wave signal, and determines that this signal is a reference signal, and this square-wave signal is by pin
Figure B2009100405007D0000111
U1009 passes to left horn by triode, this moment, triode U1010 quit work, be that single-chip microcomputer is not carried square-wave signal to right horn, left horn produces voice output after receiving square-wave signal, left side microphone detects sine wave signal from left horn, through comparator U1000A, the 2nd sine wave signal among the back formation of amplification successively Fig. 4 of U1000B, zero-crossing comparator U1001A converts the positive half cycle of sine wave signal in the square wave " 1 " signal, convert the negative half period of sine wave signal in the square wave " 0 " signal, thereby form the 3rd square-wave signal among Fig. 4; Zero-crossing comparator U1001B converts the negative half period of sine wave signal in the square wave " 1 " signal, converts the positive half cycle of sine wave signal in the square wave " 0 " signal, thereby forms the 4th square-wave signal among Fig. 4; The pin of single-chip microcomputer 1
Figure B2009100405007D0000121
Difference typing two-way square-wave signal, single-chip microcomputer 1 compares two-way square-wave signal and reference square wave signal, and mode relatively is: at one time, when reference square wave was " 1 ", the 3rd square wave should be " 1 ", and the 4th square wave should be " 0 "; When reference square wave was " 0 ", the 3rd square wave should be " 0 ", and the 4th square wave should be " 1 ".Just formed the 5th signal graph according to above-mentioned standard of comparison, on behalf of loudspeaker, dash area just the phase range of quality problems occurs when output sound among this figure, so this device can accurately be judged the error phase of loudspeaker when transaudient, dash area does not cover whole the 5th square wave, and tested loudspeaker connect anti-problem with regard to polarity not occurring.If at one time, when reference square wave is " 1 ", the 3rd square wave is " 0 ", the 4th square wave is " 1 ", when reference square wave is " 0 ", the 3rd square wave is " 1 ", the 4th square wave be " 0, referring to Fig. 5; make that the 3rd square wave is opposite fully with reference square wave; when the 4th square wave and reference square wave were identical, dash area covered whole the 5th square wave, and tested loudspeaker connect anti-problem with regard to polarity occurring; single-chip microcomputer is judged this loudspeaker polarity and connect instead; light-emitting diode D1004 glows, and buzzer sends long sound simultaneously, since the polarity of expression left horn connect instead; Otherwise, light-emitting diode D1005 green light, simultaneously buzzer sends " dripping " sound, since represent that the polarity of left horn does not connect instead.And then the detection right horn, it is the same with left horn to detect principle, in this few description.
2, the left and right sides loudspeaker of dual track connect the reverse-examination survey
Switch S 1006 is disconnected, make this device be in the dual track working method, switch S 1007 is disconnected, make this device be in the positive polarity judgment mode.Left horn negative pole with earphone is connected with the collector electrode of the triode U1009 of L channel then, be connected with power supply VCC the left horn of earphone is anodal, and with the close left microphone of left horn; The right horn negative pole of earphone is connected with the collector electrode of the triode U1010 of R channel, is connected with power supply VCC the right horn of earphone is anodal, and with the close right microphone of right horn.The square-wave signal that single-chip microcomputer is produced sends left horn to by the L channel output control circuit, if right microphone can detect signal, and left microphone detects less than signal, single-chip microcomputer just judges that left and right loudspeaker connect instead, be exactly that left and right acoustic channels connects instead, light-emitting diode D1004 and D1006 glow simultaneously to glimmer and indicate, and buzzer sends long sound simultaneously, connects instead to represent left and right loudspeaker.
3, monaural loudspeaker polarity detects
If the loudspeaker that detect are single loudspeaker, with switch S 1006 closures, make this device be in the mono-operation mode, switch S 1007 is disconnected, make this device be in the positive polarity judgment mode.Then the collector electrode of single loudspeaker negative pole with the triode U1009 (or triode U1010) of L channel (or R channel) is connected, the loudspeaker positive pole is connected with power supply VCC, and with the close left microphone (right microphone) of loudspeaker; The detection principle of loudspeaker of principle of polarity and dual track that detects single loudspeaker is identical, in this few description.

Claims (10)

1.一种喇叭极性测试装置，其特征在于包括有：1. A horn polarity testing device is characterized in that comprising: 单片机(1)，产生方波信号输出；Single-chip microcomputer (1), produces square wave signal output; 左声道输出控制电路(2)，对方波信号整理后送到被测左喇叭，左喇叭在这一信号作用下引起膜片的振动，形成声阵信号；The left channel output control circuit (2) sends the square wave signal to the left speaker under test after sorting, and the left speaker causes the vibration of the diaphragm under the action of this signal to form an acoustic array signal; 左麦克风(3)，将声振信号转换成正弦波信号；The left microphone (3) converts the acoustic vibration signal into a sine wave signal; 左麦克风前置电压放大电路(4)，对正弦波信号进行电压放大；The left microphone front voltage amplifying circuit (4) carries out voltage amplification to the sine wave signal; 左功率放大电路(5)，对左麦克风前置电压放大电路(4)输出的信号进行电流放大；The left power amplifying circuit (5) carries out current amplification to the signal output by the left microphone pre-voltage amplifying circuit (4); 左过零比较电路(6)，对左功率放大电路(5)输出的正弦波信号进行正负半周分离，形成两路方波信号输入给单片机(1)，所述单片机(1)将两路方波与内部产生的方波比较并判断出该被测喇叭极性是否接反；The left zero-crossing comparison circuit (6) separates the positive and negative half-cycles of the sine wave signal output by the left power amplifier circuit (5), forming two-way square wave signals and inputting them to the single-chip microcomputer (1), and the said single-chip microcomputer (1) converts the two-way Compare the square wave with the internally generated square wave and judge whether the polarity of the speaker under test is reversed; 右声道输出控制电路(7)，对单片机(1)产生方波信号整理后送到被测右喇叭，右喇叭在这一信号作用下引起膜片的振动，形成声阵信号；The right sound channel output control circuit (7) sends the measured right speaker to the square wave signal generated by the single-chip microcomputer (1), and the right speaker causes the diaphragm to vibrate under the action of this signal to form an acoustic array signal; 右麦克风(8)，将声振信号转换成正弦波信号；The right microphone (8) converts the acoustic vibration signal into a sine wave signal; 右麦克风前置电压放大电路(9)，对正弦波信号进行电压放大；The right microphone front voltage amplifying circuit (9) carries out voltage amplification to the sine wave signal; 右功率放大电路(10)，对右麦克风前置电压放大电路(9)输出的信号进行电流放大；The right power amplifying circuit (10) carries out current amplification to the signal output by the right microphone pre-voltage amplifying circuit (9); 右过零比较电路(11)，对右功率放大电路(10)输出的正弦波信号进行正负半周分离，形成两路方波信号输入给单片机(1)，所述单片机(1)将两路方波与内部产生的方波比较并判断出该被测喇叭极性是否接反；The right zero-crossing comparator circuit (11) separates the positive and negative half-cycles of the sine wave signal output by the right power amplifier circuit (10), forming two-way square wave signals that are input to the single-chip microcomputer (1), and the single-chip microcomputer (1) converts the two-way Compare the square wave with the internally generated square wave and judge whether the polarity of the speaker under test is reversed; 报警电路，对左、右喇叭极性接反以及左喇叭和右喇叭接反进行报警。The alarm circuit is used to alarm the reverse polarity of the left and right speakers and the reverse connection of the left and right speakers. 2.根据权利要求1所述的一种喇叭极性测试装置，其特征在于还包括有用于切换单、双声道以及改变极性判断方式的键盘控制/功能转换电路(13)。2. A horn polarity testing device according to claim 1, characterized in that it also includes a keyboard control/function conversion circuit (13) for switching between single and dual sound channels and changing the polarity judgment mode. 3.根据权利要求1或2所述的一种喇叭极性测试装置，其特征在于所述报警电路包括有3. A horn polarity testing device according to claim 1 or 2, characterized in that the alarm circuit includes LED报警电路(15)，对左、右喇叭极性接反以及左喇叭和右喇叭接反进行光显示报警；The LED alarm circuit (15) performs a light display alarm for the polarity reversal of the left and right speakers and the reverse connection of the left and right speakers; 声音报警电路(16)，对左、右喇叭极性接反以及左喇叭和右喇叭接反进行声音报警。The sound alarm circuit (16) carries out sound alarm to the polarity reversal of the left and right horns and the reverse connection of the left horn and the right horn. 4.根据权利要求1所述的一种喇叭极性测试装置，其特征在于所述左过零比较电路(6)包括有电阻(R1020)，过零比较器(U1001A、U1001B)；所述电阻(R1020)一端与左功率放大电路(5)输出端连接，电阻(R1020)另一端通过电阻(R1037)与过零比较器(U1001A)的反相输入端连接，同时通过电阻(R1036)与过零比较器(U1001B)的同相输入端连接；过零比较器(U1001A)的同相输入端与电阻(R1022)一端和电阻(R1034)一端都连接，电阻(R1022)另一端接+5V电源，电阻(R1034)另一端接地，过零比较器(U1001A)的输出端与电阻(R1023)一端和电阻(R1038)一端都连接，电阻(R1023)另一端接地，电阻(R1038)另一端(PC0)作为分离出的正半周方波输出端，该输出端与单片机(1)的脚
Figure F2009100405007C0000031
连接；过零比较器(U1001B)的反相输入端与电阻(R1035)一端和电阻(R1044)一端都连接，电阻(R1044)另一端接+5V电源，电阻(R1035)另一端接地；过零比较器(U1001B)的输出端与电阻(R1024)一端和电阻(R1039)一端都连接，电阻(R1024)另一端接地，电阻(R1039)另一端(PC1)作为分离出的负半周方波输出端，该输出端与单片机(1)的脚连接。4. A kind of speaker polarity testing device according to claim 1, characterized in that said left zero-crossing comparison circuit (6) includes a resistor (R1020), a zero-crossing comparator (U1001A, U1001B); said resistor One end of (R1020) is connected to the output end of the left power amplifying circuit (5), and the other end of the resistor (R1020) is connected to the inverting input end of the zero-crossing comparator (U1001A) through the resistor (R1037). The non-inverting input terminal of the zero comparator (U1001B) is connected; the non-inverting input terminal of the zero-crossing comparator (U1001A) is connected to one terminal of the resistor (R1022) and one terminal of the resistor (R1034), and the other terminal of the resistor (R1022) is connected to the +5V power supply. The other end of (R1034) is grounded, the output end of the zero-crossing comparator (U1001A) is connected to one end of the resistor (R1023) and one end of the resistor (R1038), the other end of the resistor (R1023) is grounded, and the other end of the resistor (R1038) (PC 0 ) As the separated positive half-cycle square wave output, the output is connected to the pin of the single-chip microcomputer (1)
Figure F2009100405007C0000031
Connection; the inverting input terminal of the zero-crossing comparator (U1001B) is connected to one end of the resistor (R1035) and one end of the resistor (R1044), the other end of the resistor (R1044) is connected to +5V power supply, and the other end of the resistor (R1035) is grounded; zero-crossing The output terminal of the comparator (U1001B) is connected to one terminal of the resistor (R1024) and one terminal of the resistor (R1039), the other terminal of the resistor (R1024) is grounded, and the other terminal of the resistor (R1039) (PC 1 ) is output as a separated negative half cycle square wave terminal, the output terminal and the pin of the single chip microcomputer (1) connect. 5.根据权利要求1所述的一种喇叭极性测试装置，其特征在于所述左声道输出控制电路(2)包括有电阻(R1029、R1050、R1030、R1052)，开关(S1000、S1001、S1002)，电容(C1006、C1002)以及三极管(U1009)；所述电阻(R1029)一端与电容(C1006)一端连接后作为左声道输出控制电路(2)输入端与单片机(1)脚
Figure F2009100405007C0000033
连接，电阻(R1029)另一端接地，电容(C1006)另一端与电阻(R1050、R1030、R1052)的一端分别连接，电阻(R1050、R1030、R1052)的另一端都与开关(S1000、S1001、S1002)连接，开关(S1000、S1001、S1002)的另一端都与电容(C1002)的一端及三极管(U1009)基极连接，电容(C1002)的另一端接地，三极管(U1009)的发射极接地。5. A kind of speaker polarity testing device according to claim 1, characterized in that said left channel output control circuit (2) includes resistors (R1029, R1050, R1030, R1052), switches (S1000, S1001, S1002), capacitors (C1006, C1002) and triode (U1009); one end of the resistor (R1029) is connected to one end of the capacitor (C1006) as the input end of the left channel output control circuit (2) and the pin of the single chip microcomputer (1)
Figure F2009100405007C0000033
connection, the other end of the resistor (R1029) is grounded, the other end of the capacitor (C1006) is connected to one end of the resistors (R1050, R1030, R1052) ), the other ends of the switches (S1000, S1001, S1002) are all connected to one end of the capacitor (C1002) and the base of the triode (U1009), the other end of the capacitor (C1002) is grounded, and the emitter of the triode (U1009) is grounded. 6.根据权利要求1所述的一种喇叭极性测试装置，其特征在于所述左麦克风前置电压放大电路(4)包括有电阻(R1000、R1002、R1004、R1006)，电容(C1000、C1004、C1008、C1009、C1012)，以及比较器(U1000A)；电阻(R1000、R1002)以及电容(C1000)的一端连接在一起后作为输入端与左麦克风(3)连接，电阻(R1000)的另一端与电容(C1004)一端和+5V电源连接，电容(C1004)另一端接地，电阻(R1002)的另一端通过电容(C1008)与比较器(U1000A)反相输入端连接，电容(C1000)的另一端接地，比较器(U1000A)同相输入端通过电容(C1012)接+5V电源，比较器(U1000A)输出端依次通过电容(C1009)、电阻(R1004)接地，电容(C1009)和电阻(R1004)之间的接点与电阻(R1002)和电容(C1008)之间的接点连接，电阻(R1006)一端与比较器(U1000A)反相输入端连接，电阻(R1006)另一端与比较器(U1000A)输出端连接。6. A kind of speaker polarity testing device according to claim 1, characterized in that said left microphone pre-voltage amplifying circuit (4) includes resistors (R1000, R1002, R1004, R1006), capacitors (C1000, C1004 . Connect one end of the capacitor (C1004) to the +5V power supply, the other end of the capacitor (C1004) is grounded, the other end of the resistor (R1002) is connected to the inverting input end of the comparator (U1000A) through the capacitor (C1008), and the other end of the capacitor (C1000) One end is grounded, the non-inverting input terminal of the comparator (U1000A) is connected to the +5V power supply through the capacitor (C1012), the output terminal of the comparator (U1000A) is grounded through the capacitor (C1009) and the resistor (R1004) in turn, and the capacitor (C1009) and the resistor (R1004) are grounded. The contact between them is connected to the contact between the resistor (R1002) and the capacitor (C1008), one end of the resistor (R1006) is connected to the inverting input of the comparator (U1000A), and the other end of the resistor (R1006) is connected to the output of the comparator (U1000A) end connection. 7.根据权利要求1所述的一种喇叭极性测试装置，其特征在于所述左功率放大电路(5)包括有电阻(R1008、R1010、R1012、R1014、R1016、R1018)，电容(C1016、C1018、C1019、C1013)以及比较器(U1000B)；所述比较器(U1000B)的同相输入端通过电阻(R1012)与+5V电源连接，同时与比较器(U1000A)同相输入端连接，比较器(U1000B)的反相输入端依次通过电容(C1018)、电阻(R1008)、电容(C1016)与比较器(U1000A)输出端连接，电阻(R1010)一端与电容(C1019)一端连接后与电容(C1018)和电阻(R1008)之间的接点连接，电阻(R1010)另一端接地，电容(C1019)另一端与电阻(R1018)一端连接后与比较器(U1000B)输出端连接，电阻(R1018)另一端接地，电阻(R1014)一端与电容(C1013)一端连接后与比较器(U1000B)同相输入端连接，电阻(R1014)另一端和电容(C1013)另一端都接地，电阻(R1016)一端与比较器(U1000B)的反相输入端连接，电阻(R1016)另一端与比较器(U1000B)输出端连接。7. A kind of speaker polarity testing device according to claim 1, characterized in that said left power amplifying circuit (5) includes resistors (R1008, R1010, R1012, R1014, R1016, R1018), capacitors (C1016, C1018, C1019, C1013) and a comparator (U1000B); the non-inverting input terminal of the comparator (U1000B) is connected to the +5V power supply through a resistor (R1012), and is connected to the non-inverting input terminal of the comparator (U1000A), and the comparator ( The inverting input terminal of U1000B) is connected to the output terminal of the comparator (U1000A) through the capacitor (C1018), resistor (R1008), and capacitor (C1016) in turn, and one end of the resistor (R1010) is connected to one end of the capacitor (C1019) and then connected to the capacitor (C1018 ) and the resistor (R1008), the other end of the resistor (R1010) is grounded, the other end of the capacitor (C1019) is connected to one end of the resistor (R1018) and then connected to the output end of the comparator (U1000B), and the other end of the resistor (R1018) Grounding, one end of the resistor (R1014) is connected to one end of the capacitor (C1013) and then connected to the same-inverting input end of the comparator (U1000B), the other end of the resistor (R1014) and the other end of the capacitor (C1013) are grounded, one end of the resistor (R1016) is connected to the comparator The inverting input terminal of (U1000B) is connected, and the other end of the resistor (R1016) is connected with the output terminal of the comparator (U1000B). 8.根据权利要求1所述的一种喇叭极性测试装置，其特征在于所述键盘控制/功能转换电路(13)包括有单/双声道转换开关(S1006)和极性转换开关(S1007)，开关(S1006)一端接地，另一端与电阻(R1033)一端及单片机(1)的脚
Figure F2009100405007C0000051
都连接，电阻(R1033)另一端与电源(VCC)连接；开关(S1007)一端接地，另一端与电阻(R1028)一端及单片机(1)的脚
Figure F2009100405007C0000052
都连接，电阻(R1028)另一端与电源(VCC)连接。8. A horn polarity testing device according to claim 1, characterized in that said keyboard control/function conversion circuit (13) includes a single/dual-channel changeover switch (S1006) and a polarity changeover switch (S1007 ), one end of the switch (S1006) is grounded, the other end is connected to one end of the resistor (R1033) and the pin of the microcontroller (1)
Figure F2009100405007C0000051
Both are connected, the other end of the resistor (R1033) is connected to the power supply (VCC); one end of the switch (S1007) is grounded, and the other end is connected to the end of the resistor (R1028) and the pin of the microcontroller (1)
Figure F2009100405007C0000052
Both are connected, and the other end of the resistor (R1028) is connected to the power supply (VCC). 9.根据权利要求1所述的一种喇叭极性测试装置，其特征在于所述LED报警电路(15)包括有发红光的发光二极管(D1004、D1006)和发绿光的发光二极管(D1005、D1007)，发光二极管(D1004、D1005、D1006、D1007)的正极分别通过电阻(R1045、R1046、R1047、R1048)与单片机(1)的脚②、③、④、⑤连接，发光二极管(D1004、D1005、D1006、D1007)的负极分别接地。9. A horn polarity testing device according to claim 1, characterized in that said LED alarm circuit (15) includes red light emitting diodes (D1004, D1006) and green light emitting diodes (D1005 , D1007), the anodes of the light emitting diodes (D1004, D1005, D1006, D1007) are respectively connected to the feet ②, ③, ④, ⑤ of the microcontroller (1) through the resistors (R1045, R1046, R1047, R1048), and the light emitting diodes (D1004, The negative poles of D1005, D1006, D1007) are grounded respectively. 10.根据权利要求1所述的一种喇叭极性测试装置，其特征在于所述声音报警电路(16)包括有蜂鸣器(SPK1000)和三极管(U1008)，蜂鸣器(SPK1000)的一个输入端接电源(VCC)，另一端与三极管(U1008)的集电极连接，三极管(U1008)的发射极接地，三极管(U1008)的基极通过电阻(R1049)与单片机(1)的脚
Figure F2009100405007C0000053
连接。10. A kind of horn polarity testing device according to claim 1, it is characterized in that said sound alarm circuit (16) includes buzzer (SPK1000) and triode (U1008), a buzzer (SPK1000) The input terminal is connected to the power supply (VCC), the other end is connected to the collector of the triode (U1008), the emitter of the triode (U1008) is grounded, the base of the triode (U1008) is connected to the pin of the microcontroller (1) through the resistor (R1049)
Figure F2009100405007C0000053
connect.
CN200910040500.7A 2009-06-19 2009-06-19 Loudspeaker polarity testing arrangement Active CN101931851B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN200910040500.7A CN101931851B (en) 2009-06-19 2009-06-19 Loudspeaker polarity testing arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN200910040500.7A CN101931851B (en) 2009-06-19 2009-06-19 Loudspeaker polarity testing arrangement

Publications (2)

Publication Number Publication Date
CN101931851A true CN101931851A (en) 2010-12-29
CN101931851B CN101931851B (en) 2014-06-25

Family

ID=43370718

Family Applications (1)

Application Number Title Priority Date Filing Date
CN200910040500.7A Active CN101931851B (en) 2009-06-19 2009-06-19 Loudspeaker polarity testing arrangement

Country Status (1)

Country Link
CN (1) CN101931851B (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105101033A (en) * 2015-09-29 2015-11-25 梧州恒声电子科技有限公司 Trumpet curve testing device
CN105158529A (en) * 2015-09-29 2015-12-16 梧州恒声电子科技有限公司 Improved error-proof clamp for testing horn polarity
CN105357622A (en) * 2015-09-29 2016-02-24 梧州恒声电子科技有限公司 Clamp used for testing polarity of horn
CN106028248A (en) * 2016-08-08 2016-10-12 广州视源电子科技股份有限公司 Loudspeaker polarity detection method and device
CN106162473A (en) * 2016-08-31 2016-11-23 苏州倍声声学技术有限公司 A kind of dynamic ferrum loudspeaker indicating polarity
CN106211014A (en) * 2016-08-09 2016-12-07 广州视源电子科技股份有限公司 Loudspeaker detection method and device
CN107241676A (en) * 2017-06-15 2017-10-10 南通同洲电子有限责任公司 A kind of loudspeaker power amplifier test device
CN110611870A (en) * 2018-06-15 2019-12-24 西万拓私人有限公司 Method for identifying receiver, hearing system and earphone
CN110891236A (en) * 2018-09-09 2020-03-17 广东思派康电子科技有限公司 Method and device for realizing production test of multi-microphone array
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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JP2002345091A (en) * 2001-05-17 2002-11-29 Toa Corp Speaker fault detector and speaker fault detection method
CN201616906U (en) * 2009-06-19 2010-10-27 中山市天键电子工业有限公司 Polarity test device for loudspeakers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JP2002345091A (en) * 2001-05-17 2002-11-29 Toa Corp Speaker fault detector and speaker fault detection method
CN201616906U (en) * 2009-06-19 2010-10-27 中山市天键电子工业有限公司 Polarity test device for loudspeakers

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105357622B (en) * 2015-09-29 2018-09-14 梧州恒声电子科技有限公司 A kind of polar fixture of loudspeaker survey
CN105158529A (en) * 2015-09-29 2015-12-16 梧州恒声电子科技有限公司 Improved error-proof clamp for testing horn polarity
CN105357622A (en) * 2015-09-29 2016-02-24 梧州恒声电子科技有限公司 Clamp used for testing polarity of horn
CN105101033A (en) * 2015-09-29 2015-11-25 梧州恒声电子科技有限公司 Trumpet curve testing device
CN106028248A (en) * 2016-08-08 2016-10-12 广州视源电子科技股份有限公司 Loudspeaker polarity detection method and device
CN106028248B (en) * 2016-08-08 2018-11-13 广州视源电子科技股份有限公司 Loudspeaker polarity detection method and device
CN106211014B (en) * 2016-08-09 2019-06-21 广州视源电子科技股份有限公司 Loudspeaker detection method and device
CN106211014A (en) * 2016-08-09 2016-12-07 广州视源电子科技股份有限公司 Loudspeaker detection method and device
CN106162473A (en) * 2016-08-31 2016-11-23 苏州倍声声学技术有限公司 A kind of dynamic ferrum loudspeaker indicating polarity
CN107241676A (en) * 2017-06-15 2017-10-10 南通同洲电子有限责任公司 A kind of loudspeaker power amplifier test device
CN110611870A (en) * 2018-06-15 2019-12-24 西万拓私人有限公司 Method for identifying receiver, hearing system and earphone
CN110611870B (en) * 2018-06-15 2021-07-27 西万拓私人有限公司 Method for identifying receiver, hearing system and earphone
CN110891236A (en) * 2018-09-09 2020-03-17 广东思派康电子科技有限公司 Method and device for realizing production test of multi-microphone array
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

Also Published As

Publication number Publication date
CN101931851B (en) 2014-06-25

Similar Documents

Publication Publication Date Title
CN101931851B (en) Loudspeaker polarity testing arrangement
CN201616906U (en) Polarity test device for loudspeakers
CN105489063B (en) A kind of new-energy automobile pedestrian's sound alarming device with active forewarning
CN202735105U (en) Fault detecting device
CN101426169B (en) A Time Domain Tracking Filter and System for Quickly Detecting the Acoustic Response Parameters of a Sounding Body
CN105383376B (en) A kind of new-energy automobile pedestrian's sound alarming device based on ambient sound feedback
CN104916288B (en) The method and device of the prominent processing of voice in a kind of audio
CN104113803A (en) Multi-voice-coil based loudspeaker system
CN109375133B (en) Device and method for detecting DC resistance of current sensor
CN102288882A (en) Partial discharge monitoring system and method for multichannel electrical equipment
CN105510813A (en) System for online monitoring of state of converter transformer tap switch based on vibration principle
CN113030248B (en) Hydrogen measurement system and method based on ultrasonic double-frequency phase difference
CN103634723B (en) Audio input circuit and the electronic equipment with audio input
CN102590803A (en) Circuit and method for processing ultrasonic echo signal of reversing radar
CN107172558A (en) A kind of novel horn fault detection method
CN102590598A (en) Method for predicting zero crossing point of ultrasonic signal based on multi-threshold comparison
CN110891236A (en) Method and device for realizing production test of multi-microphone array
CN202547770U (en) Abnormal noise identification system
CN204349567U (en) The identification circuit of a kind of internal combustion engine generator and civil power
CN107438222A (en) It is a kind of to break and short-circuit detecting circuit and method towards earphone/headset loudspeaker
CN206695967U (en) A kind of vibration experiment
CN104359008A (en) Pipe network audio collector and realization method
CN210899578U (en) Sounding device capable of automatically detecting sounding fault
JP3237232U (en) Transformer space noise detection electrical circuit
CN110099350A (en) The test method of power amplifier

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20180725

Address after: 342300 the upper European Industrial Park, Gong Jiang Town, Yudu County, Ganzhou, Jiangxi, China

Patentee after: Jiangxi Tianjian electroacoustic Co Ltd

Address before: 528400 Guangdong Zhongshan port town, Mu He Jing Industrial Zone

Patentee before: Zhongshan Minami Audio Equipment Co., Ltd.

CP03 Change of name, title or address
CP03 Change of name, title or address

Address after: 341000, Ganzhou, Jiangxi province Yudu County town on the upper European Industrial Park

Patentee after: Tianjian electroacoustic Co.,Ltd.

Address before: 342300 Yudu City, Ganzhou Province town of tribute on the European Industrial Park

Patentee before: JIANGXI TIANJIAN ELECTROACOUSTIC Co.,Ltd.