CN106162484A - A kind of earphone impedance detecting system, method and portable electric appts - Google Patents
A kind of earphone impedance detecting system, method and portable electric appts Download PDFInfo
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- CN106162484A CN106162484A CN201510181847.9A CN201510181847A CN106162484A CN 106162484 A CN106162484 A CN 106162484A CN 201510181847 A CN201510181847 A CN 201510181847A CN 106162484 A CN106162484 A CN 106162484A
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Abstract
The present invention relates to electronic technology field, it is specifically related to a kind of earphone impedance detecting system, including an earphone interface, for connecting tested earphone, also include that signal generating circuit is connected with earphone interface, for producing an AC signal and inputting tested earphone, using the pumping signal as tested earphone from earphone interface audio output port；Signal sampling unit, the voltage drop between sampled audio output port and earth terminal；Signal processing unit, is connected with signal sampling unit, and voltage drop processes to obtain the impedance data of tested earphone.The present invention inputs an audio output port of earphone interface using the pumping signal as tested earphone by AC signal, voltage drop between audio output port and earth terminal is sampled simultaneously, system can be passed to after processing to obtain impedance data to this voltage drop so that system obtains preferably audio performance after adjusting.The present invention can be conducive to promoting detection efficiency with the shortening earphone impedance detection time.
Description
Technical field
The present invention relates to electronic technology field, be specifically related to a kind of earphone impedance detecting system.
Background technology
nullPortable electric appts and the development of audio standard，Headphone audio system is proposed the highest requirement，As affecting one of most important function of Consumer's Experience，Earphone should match with the performance of the portable electric appts accessed，Gratifying audio performance could be showed，Along with digital technology and the development of computer technology，Measurement technology and measuring method to earphone impedance are updated，In prior art, a kind of earphone impedance detecting system is with reference to shown in Fig. 1，After test signal Vin is processed the earphone speaker of after-applied to tested earphone，Voltage drop to earphone speaker two ends carries out sampling acquisition earphone impedance information，In order to ensure that testing signal applies to tested earphone in prior art，Tested earphone will not produce audio frequency noise (POP Noise)，After the amplitude of test signal must be raised slowly to set range value，Just test，Existing earphone impedance is caused to detect overlong time，Affect detection efficiency.
Summary of the invention
It is an object of the invention to, it is provided that a kind of earphone impedance detecting system, solve above technical problem；
Technical problem solved by the invention can realize by the following technical solutions:
A kind of earphone impedance detecting system, wherein, including an earphone interface, is used for connecting tested earphone, also includes,
Signal generating circuit, is connected with described earphone interface, for producing an AC signal and inputting described tested earphone, using the pumping signal as described tested earphone from an audio output port of described earphone interface；
Signal sampling unit, connects described audio output port and earth terminal, for sampling the voltage drop between described audio output port and earth terminal；
Signal processing unit, is connected with described signal sampling unit, and described voltage drop processes to obtain the impedance data of described tested earphone.
A kind of earphone impedance detecting system of the present invention, a voltage follower it is connected between described signal generating circuit with described audio output port, described voltage follower is mainly made up of an operational amplifier, and the in-phase input end in described operational amplifier connects described AC signal；Outfan in described operational amplifier connects described audio output port by an adjustable resistance.
A kind of earphone impedance detecting system of the present invention, described AC signal is the sinusoidal signal of setpoint frequency.
A kind of earphone impedance detecting system of the present invention, described setpoint frequency is more than 20KHz.
A kind of earphone impedance detecting system of the present invention, described setpoint frequency is 40KHz.
A kind of earphone impedance detecting system of the present invention, described signal processing unit includes modulus conversion chip, for described voltage drop is converted to digital signal.
A kind of earphone impedance detecting system of the present invention, also includes digital signal processing chip, is connected with described modulus conversion chip, for processing to obtain impedance data to described digital signal.
The present invention also provides for a kind of earphone impedance detection method, wherein, for above-mentioned earphone impedance detecting system, comprises the following steps:
Step 1, for producing an AC signal and inputting described tested earphone, using the pumping signal as described tested earphone from an audio output port of described earphone interface；
Step 2, the voltage drop between described audio output port and earth terminal of sampling；
Step 3, processes to obtain impedance data to described voltage drop.
The earphone impedance detection method of the present invention, wherein, described AC signal is the sinusoidal signal that setpoint frequency is more than 20KHz.
A kind of portable electric appts, wherein, including above-mentioned earphone impedance detecting system.
Beneficial effect: owing to using above technical scheme, the present invention inputs an audio output port of earphone interface using the pumping signal as tested earphone by an AC signal, voltage drop between audio output port and earth terminal is sampled simultaneously, system can be passed to after processing to obtain impedance data to this voltage drop so that system obtains preferably audio performance after adjusting；The present invention can be conducive to promoting detection efficiency with the shortening earphone impedance detection time.
Accompanying drawing explanation
Fig. 1 is the earphone impedance measurement system diagram of prior art；
The time dependent oscillogram of pumping signal that Fig. 2 is traditional；
Fig. 3 is the earphone impedance test system structure figure of the present invention；
Fig. 4 is the time dependent schematic diagram of AC signal of the input of the present invention；
Fig. 5 is the time dependent schematic diagram of pumping signal of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained on the premise of not making creative work, broadly fall into the scope of protection of the invention.
It should be noted that in the case of not conflicting, the embodiment in the present invention and the feature in embodiment can be mutually combined.
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, but not as limiting to the invention.
With reference to Fig. 3, a kind of earphone impedance detecting system, wherein, including an earphone interface, it is used for connecting tested earphone, also includes,
Signal generating circuit, for producing an AC signal and inputting tested earphone, using the pumping signal as tested earphone from earphone interface audio output port；
Signal sampling unit, the voltage drop between sampled audio output port and earth terminal；
Signal processing unit, is connected with signal sampling unit, processes to obtain impedance data to voltage drop.
Prior art to the test of voltage drop with reference to needing shown in Fig. 2 to carry out in the Time2 stage, Time1 and Time3 stage voltage amplitude needs slowly to rise or fall to alleviate audio frequency noise simultaneously, the present invention inputs an audio output port of earphone interface using the pumping signal as tested earphone by an AC signal, voltage drop between audio output port and earth terminal is sampled simultaneously, system can be passed to after processing to obtain impedance data to this voltage drop so that system obtains preferably audio performance after adjusting.Owing to can test during rising in time at waveshape signal, the present invention can be conducive to promoting detection efficiency with the shortening earphone impedance detection time.
A kind of earphone impedance detecting system of the present invention, is connected a voltage follower between signal generating circuit with audio output port, voltage follower is mainly made up of an operational amplifier 15, and the in-phase input end in operational amplifier connects the AC signal of input；Outfan in operational amplifier connects audio output port by an adjustable resistance.The signal of voltage follower in-phase input end, with reference to shown in Fig. 4, applies the excitation signal waveforms of extremely tested earphone with reference to shown in Fig. 5.
A kind of earphone impedance detecting system of the present invention, AC signal is the sinusoidal signal of setpoint frequency.Setpoint frequency is preferably greater than 20KHz, if setpoint frequency can be 40KHz.The sound of 20Hz～20KHz is responded by most people, if frequency will be unable to hear higher than 20KHz human ear, audio frequency noise refer to audio frequency amplifier powering on, shutdown transient and when standby switching, apply explosion sound produced by the voltage jump to earphone, the present invention uses the test signal more than 20KHz, reduce human ear and hear the probability of audio frequency noise, be conducive to promoting Consumer's Experience.This sinusoidal signal can be produced by sinusoidal signal generator, generates as direct digital synthesis technique (Direct Digital Synthesizer, DDS) chip can be used to combine a small amount of peripheral component.
A kind of earphone impedance detecting system of the present invention, signal processing unit includes modulus conversion chip 11, for voltage drop is converted to digital signal.
A kind of earphone impedance detecting system of the present invention, it is also possible to include digital signal processing chip 12, be connected with modulus conversion chip 11, for processing to obtain impedance data to digital signal.Digital signal processing chip 12 can be connected with baseband processor or audio coding decoding chip further, to adjust audio frequency parameter in real time, it is thus achieved that the audio performance of optimization.Digital signal processing chip 12 can include controlling logical block, by judging that the impedance data of tested earphone is to configure corresponding digital algorithm.
The present invention also provides for a kind of earphone impedance detection method, wherein, for above-mentioned earphone impedance detecting system, comprises the following steps:
Step 1, for producing an AC signal and inputting tested earphone, using the pumping signal as tested earphone from earphone interface audio output port；
Step 2, the voltage drop between sampled audio output port and earth terminal；
Step 3, processes to obtain impedance data to voltage drop.
The earphone impedance detection method of the present invention, above-mentioned AC signal is the sinusoidal signal that setpoint frequency is more than 20KHz.The present invention can be integrated in any one portable electric appts with earphone interface, to optimize earpiece audio performance, promotes Consumer's Experience.
The foregoing is only preferred embodiment of the present invention; not thereby embodiments of the present invention and protection domain are limited; to those skilled in the art; the equivalent done by all utilization description of the invention and diagramatic content and the scheme obtained by obvious change should be can appreciate that, all should be included in protection scope of the present invention.
Claims (10)
1. an earphone impedance detecting system, it is characterised in that include an earphone interface, is used for connecting quilt
Survey earphone, also include,
Signal generating circuit, is connected with described earphone interface, for producing an AC signal and from described ear
One audio output port of machine interface inputs described tested earphone, using the excitation as described tested earphone
Signal；
Signal sampling unit, connects described audio output port and earth terminal, and the described audio frequency that is used for sampling is defeated
Go out the voltage drop between port and earth terminal；
Signal processing unit, is connected with described signal sampling unit, processes to obtain to described voltage drop
Obtain the impedance data of described tested earphone.
A kind of earphone impedance detecting system the most according to claim 1, it is characterised in that described letter
Number produce and to be connected a voltage follower, described voltage follower master between circuit and described audio output port
Will be made up of an operational amplifier, the in-phase input end in described operational amplifier connects described AC signal；
Outfan in described operational amplifier connects described audio output port by an adjustable resistance.
A kind of earphone impedance detecting system the most according to claim 1, it is characterised in that described friendship
Stream signal is the sinusoidal signal of setpoint frequency.
A kind of earphone impedance detecting system the most according to claim 3, it is characterised in that described in set
Determine frequency more than 20KHz.
A kind of earphone impedance detecting system the most according to claim 4, it is characterised in that described in set
Determining frequency is 40KHz.
A kind of earphone impedance detecting system the most according to claim 1, it is characterised in that described letter
Number processing unit includes modulus conversion chip, for described voltage drop is converted to digital signal.
A kind of earphone impedance detecting system the most according to claim 6, it is characterised in that also include
Digital signal processing chip, is connected with described modulus conversion chip, to described digital signal
Reason is to obtain impedance data.
8. an earphone impedance detection method, it is characterised in that for claim 1 to 7 any one
Described earphone impedance detecting system, comprises the following steps:
Step 1, for producing an AC signal defeated from an audio output port of described earphone interface
Enter described tested earphone, using the pumping signal as described tested earphone；
Step 2, the voltage drop between described audio output port and earth terminal of sampling；
Step 3, processes to obtain impedance data to described voltage drop.
A kind of earphone impedance detection method the most according to claim 8, it is characterised in that described friendship
Stream signal is the sinusoidal signal that setpoint frequency is more than 20KHz.
10. a portable electric appts, it is characterised in that include claim 1 to 7 any one
Described earphone impedance detecting system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510181847.9A CN106162484A (en) | 2015-04-16 | 2015-04-16 | A kind of earphone impedance detecting system, method and portable electric appts |
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| CN201510181847.9A CN106162484A (en) | 2015-04-16 | 2015-04-16 | A kind of earphone impedance detecting system, method and portable electric appts |
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| CN107422192A (en) * | 2017-08-02 | 2017-12-01 | 广州市锐丰音响科技股份有限公司 | Audio frequency apparatus input impedance measuring method and device, measurement method of calibration and device |
| CN108169566A (en) * | 2017-12-29 | 2018-06-15 | 江苏海湾电气科技有限公司 | Online testing impedance circuit and method |
| CN110062315A (en) * | 2019-04-24 | 2019-07-26 | 深圳康佳电子科技有限公司 | A kind of impedance self-adaptive power amplifier and loudspeaker |
| CN110470697A (en) * | 2019-08-28 | 2019-11-19 | 歌尔科技有限公司 | Earphone accommodating apparatus, earphone and the aqueous quantity measuring method of earphone |
| CN111122980A (en) * | 2019-12-27 | 2020-05-08 | 陕西烽火电子股份有限公司 | Self-adaptive circuit of earphone interface and application thereof |
| CN111227842A (en) * | 2019-12-05 | 2020-06-05 | 北京市医疗器械检验所 | Method for measuring time characteristics of otoacoustic impedance/admittance instrument |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107422192A (en) * | 2017-08-02 | 2017-12-01 | 广州市锐丰音响科技股份有限公司 | Audio frequency apparatus input impedance measuring method and device, measurement method of calibration and device |
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| CN108169566A (en) * | 2017-12-29 | 2018-06-15 | 江苏海湾电气科技有限公司 | Online testing impedance circuit and method |
| CN110062315A (en) * | 2019-04-24 | 2019-07-26 | 深圳康佳电子科技有限公司 | A kind of impedance self-adaptive power amplifier and loudspeaker |
| CN110062315B (en) * | 2019-04-24 | 2020-12-22 | 深圳康佳电子科技有限公司 | Impedance self-adaptive power amplifier circuit and loudspeaker |
| CN110470697A (en) * | 2019-08-28 | 2019-11-19 | 歌尔科技有限公司 | Earphone accommodating apparatus, earphone and the aqueous quantity measuring method of earphone |
| CN111227842A (en) * | 2019-12-05 | 2020-06-05 | 北京市医疗器械检验所 | Method for measuring time characteristics of otoacoustic impedance/admittance instrument |
| CN111227842B (en) * | 2019-12-05 | 2023-03-28 | 北京市医疗器械检验所 | Method for measuring time characteristics of otoacoustic impedance/admittance instrument |
| CN111122980A (en) * | 2019-12-27 | 2020-05-08 | 陕西烽火电子股份有限公司 | Self-adaptive circuit of earphone interface and application thereof |
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