CN101931851A - Polarity testing device of horns - Google Patents
Polarity testing device of horns Download PDFInfo
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- 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
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Abstract
The invention discloses a polarity testing device of horns, and the device comprises a single chip microcomputer, a left sound channel output control circuit, a left microphone, a front voltage amplification circuit of the left microphone, a left power amplification circuit, a left zero-crossing comparison circuit, a right sound channel output control circuit, a right microphone, a front voltage amplification circuit of the right microphone, a right power amplification circuit, a right zero-crossing comparison circuit, an alarm circuit, a keyboard control/function conversion circuit and a power circuit. The device can conveniently detect whether earphones have the problem that a left horn and a right horn are in reversed connection and whether a single horn has the problem of reversed polarities, thereby helping improve the outgoing quality of the horns.
Description
[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
Export to L channel output control circuit 2, pass through pin
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
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
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
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
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
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
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
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
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
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.
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
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
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. polarity testing device of horns is characterized in that including:
Single-chip microcomputer (1) produces square-wave signal output;
L channel output control circuit (2), 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 (3) becomes sine wave signal with the sound conversion of signals of shaking;
Left side microphone forward voltage amplifying circuit (4), offset of sinusoidal ripple signal carries out voltage amplification;
Left side power amplification circuit (5), the signal that left microphone forward voltage amplifying circuit (4) is exported carries out the electric current amplification;
Left side zero passage comparison circuit (6), sine wave signal to left power amplification circuit (5) output carries out the positive-negative half-cycle separation, form the two-way square-wave signal and input to single-chip microcomputer (1), whether described single-chip microcomputer (1) is with two-way square wave and the inner square wave that produces relatively and judge this tested loudspeaker polarity and connect instead;
R channel output control circuit (7), to delivering to tested right horn after the arrangement of single-chip microcomputer (1) generation square-wave signal, right horn causes the vibration of diaphragm under this signal effect, form the acoustic matrix signal;
Right microphone (8) becomes sine wave signal with the sound conversion of signals of shaking;
Right microphone forward voltage amplifying circuit (9), offset of sinusoidal ripple signal carries out voltage amplification;
Right power amplification circuit (10), the signal that right microphone forward voltage amplifying circuit (9) is exported carries out the electric current amplification;
Right zero passage comparison circuit (11), sine wave signal to right power amplification circuit (10) output carries out the positive-negative half-cycle separation, form the two-way square-wave signal and input to single-chip microcomputer (1), whether described single-chip microcomputer (1) 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.
2. a kind of polarity testing device of horns according to claim 1 is characterized in that also including the Keyboard Control/function conversion circuit (13) that is used to switch single, double sound channel and change polarity judgment mode.
3. a kind of polarity testing device of horns according to claim 1 and 2 is characterized in that described warning circuit includes
LED warning circuit (15) connects anti-and left horn and right horn connect the anti-light display alarm of carrying out to left and right loudspeaker polarity;
Audible alarm circuit (16) connects anti-and left horn and right horn connect the anti-audible alarm that carries out to left and right loudspeaker polarity.
4. a kind of polarity testing device of horns according to claim 1 is characterized in that described left zero passage comparison circuit (6) includes resistance (R1020), zero-crossing comparator (U1001A, U1001B); Described resistance (R1020) end is connected with left power amplification circuit (5) output, resistance (R1020) other end is connected with the inverting input of zero-crossing comparator (U1001A) by resistance (R1037), is connected with the in-phase input end of zero-crossing comparator (U1001B) by resistance (R1036) simultaneously; The in-phase input end of zero-crossing comparator (U1001A) all is connected with resistance (R1034) end with resistance (R1022) end, another termination of resistance (R1022)+5V power supply, resistance (R1034) other end ground connection, the output of zero-crossing comparator (U1001A) all is connected with resistance (R1038) end with resistance (R1023) end, resistance (R1023) other end ground connection, resistance (R1038) other end (PC
0) as isolated positive half cycle square wave output, the pin of this output and single-chip microcomputer (1)
Connect; The inverting input of zero-crossing comparator (U1001B) all is connected with resistance (R1044) end with resistance (R1035) end, another termination of resistance (R1044)+5V power supply, resistance (R1035) other end ground connection; The output of zero-crossing comparator (U1001B) all is connected with resistance (R1039) end with resistance (R1024) end, resistance (R1024) other end ground connection, resistance (R1039) other end (PC
1) as isolated negative half period square wave output, the pin of this output and single-chip microcomputer (1)
Connect.
5. a kind of polarity testing device of horns according to claim 1, it is characterized in that described L channel output control circuit (2) includes resistance (R1029, R1050, R1030, R1052), switch (S1000, S1001, S1002), electric capacity (C1006, C1002) and triode (U1009); Described resistance (R1029) end is connected the back as L channel output control circuit (2) input and single-chip microcomputer (1) pin with electric capacity (C1006) end
Connect, resistance (R1029) other end ground connection, electric capacity (C1006) other end is connected respectively with an end of resistance (R1050, R1030, R1052), the other end of resistance (R1050, R1030, R1052) all is connected with switch (S1000, S1001, S1002), the other end of switch (S1000, S1001, S1002) all is connected with an end and triode (U1009) base stage of electric capacity (C1002), the other end ground connection of electric capacity (C1002), the grounded emitter of triode (U1009).
6. a kind of polarity testing device of horns according to claim 1, it is characterized in that described left microphone forward voltage amplifying circuit (4) includes resistance (R1000, R1002, R1004, R1006), electric capacity (C1000, C1004, C1008, C1009, C1012), and comparator (U1000A); Resistance (R1000, R1002) and an end of electric capacity (C1000) link together the back be connected with left microphone (3) as input, the other end of resistance (R1000) and electric capacity (C1004) end are connected with+5V power supply, electric capacity (C1004) other end ground connection, the other end of resistance (R1002) is connected with comparator (U1000A) inverting input by electric capacity (C1008), the other end ground connection of electric capacity (C1000), comparator (U1000A) in-phase input end connects+the 5V power supply by electric capacity (C1012), comparator (U1000A) output is successively by electric capacity (C1009), resistance (R1004) ground connection, contact between electric capacity (C1009) and the resistance (R1004) is connected with contact between resistance (R1002) and the electric capacity (C1008), resistance (R1006) end is connected with comparator (U1000A) inverting input, and resistance (R1006) other end is connected with comparator (U1000A) output.
7. a kind of polarity testing device of horns according to claim 1, it is characterized in that described left power amplification circuit (5) includes resistance (R1008, R1010, R1012, R1014, R1016, R1018), electric capacity (C1016, C1018, C1019, C1013) and comparator (U1000B); The in-phase input end of described comparator (U1000B) is connected with+5V power supply by resistance (R1012), be connected with comparator (U1000A) in-phase input end simultaneously, the inverting input of comparator (U1000B) is successively by electric capacity (C1018), resistance (R1008), electric capacity (C1016) is connected with comparator (U1000A) output, resistance (R1010) end be connected with electric capacity (C1019) end back with electric capacity (C1018) and resistance (R1008) between contact be connected, resistance (R1010) other end ground connection, electric capacity (C1019) other end is connected the back and is connected with comparator (U1000B) output with resistance (R1018) end, resistance (R1018) other end ground connection, resistance (R1014) end is connected the back and is connected with comparator (U1000B) in-phase input end with electric capacity (C1013) end, resistance (R1014) other end and electric capacity (C1013) other end be ground connection all, resistance (R1016) end is connected with the inverting input of comparator (U1000B), and resistance (R1016) other end is connected with comparator (U1000B) output.
8. a kind of polarity testing device of horns according to claim 1, it is characterized in that described Keyboard Control/function conversion circuit (13) includes list/dual track change over switch (S1006) and polarity reversing switch (S1007), switch (S1006) end ground connection, the pin of the other end and resistance (R1033) end and single-chip microcomputer (1)
All connect, resistance (R1033) other end is connected with power supply (VCC); Switch (S1007) end ground connection, the pin of the other end and resistance (R1028) end and single-chip microcomputer (1)
All connect, resistance (R1028) other end is connected with power supply (VCC).
9. a kind of polarity testing device of horns according to claim 1, it is characterized in that described LED warning circuit (15) includes the light-emitting diode (D1004, D1006) that glows and the light-emitting diode (D1005, D1007) of green light, the positive pole of light-emitting diode (D1004, D1005, D1006, D1007) respectively the pin by resistance (R1045, 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.
10. a kind of polarity testing device of horns according to claim 1, it is characterized in that described audible alarm circuit (16) includes buzzer (SPK1000) and triode (U1008), an 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 (R1049) with single-chip microcomputer (1)
Connect.
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| CN200910040500.7A CN101931851B (en) | 2009-06-19 | 2009-06-19 | Polarity testing device of horns |
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| CN200910040500.7A CN101931851B (en) | 2009-06-19 | 2009-06-19 | Polarity testing device of horns |
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| 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 |
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| 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 |
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| 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 |
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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. |
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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. |