Mobile terminal and earphone circuitTechnical Field
The invention relates to the technical field of mobile terminals, in particular to a mobile terminal and an earphone circuit.
Background
The earphone is used as a main accessory of the mobile phone audio, and the user experience and the service life of an electroacoustic device are directly influenced by the quality of the audio performance of the earphone. We generally evaluate headphones mainly in terms of loudness, sensitivity, and distortion.
Radiation Sensitivity (RS) is an important test item in EMC test and certification, and the radiation difficulty capability is determined by emitting an interference signal in space and receiving an antenna signal of a mobile phone and an acoustic signal of an earphone handset.
In the prior art, the design of the earphone can meet the electrical characteristic requirements, but the earphone is insufficient for the certification test, and the antistatic (ESD) and interference capabilities are weak.
Disclosure of Invention
In order to solve the problems in the prior art, embodiments of the present invention provide a mobile terminal and an earphone circuit. The technical scheme is as follows:
in one aspect, a headset circuit is provided, including:
a plug module;
the grounding module is connected with the plug module;
the loudspeaker module is connected between the plug module and the grounding module;
a microphone module connected with the plug module;
an inductance module is connected between the microphone module and the plug module;
the microphone module is also connected with a capacitor module and a filtering module.
Optionally, the plug module comprises a first interface and a second interface; wherein the first interface is connected with the grounding module;
the second interface is connected with the microphone module.
Optionally, the speaker module comprises a right speaker interface and a left speaker interface; the plug module further comprises a third interface and a fourth interface;
the first pin of the right loudspeaker interface is connected with the third interface; the second pin of the right loudspeaker interface is connected with the grounding module;
the first pin of the left loudspeaker interface is connected with the fourth interface; and the second pin of the left loudspeaker interface is connected with the grounding module.
Optionally, the capacitance module employs a transient diode.
Optionally, the filtering module includes: a first capacitor, a second capacitor and a third capacitor;
the first, second and third capacitances are nF scale capacitances.
Optionally, the capacitance module and the filtering module are connected in parallel and then connected to the second interface.
In another aspect, a mobile terminal is provided, which includes the earphone circuit.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
1) through setting up the electric capacity module, the antistatic performance of earphone has been promoted.
2) By providing an inductive module, better impedance characteristics can be presented at high frequencies.
3) Through setting up the filtering module, not only can not produce obvious influence to effective audio frequency, can effectively restrain the harmonic again simultaneously, reach and improve anti-interference and distortion purpose.
Under the condition of ensuring the electrical characteristic performance of the earphone, the anti-interference performance of the earphone is greatly improved, and the requirement of test authentication is met.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a block diagram of an earphone circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an earphone circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example one
The present invention provides an earphone circuit, see fig. 1, comprising:
a plug module 100;
a ground module 300 connected to the header module 100;
a speaker module 200 connected between the plug module 100 and the ground module 300;
a microphone module 400 connected to the plug module 100;
an inductance module 410 is connected between the microphone module 400 and the plug module 100;
the microphone module 400 is further connected with a capacitance module 420 and a filtering module 430.
Optionally, the plug module 100 comprises a first interface and a second interface; wherein,
the first interface is connected with the grounding module;
the second interface is connected with the microphone module.
Optionally, the speaker module 200 comprises a right speaker interface and a left speaker interface; the plug module further comprises a third interface and a fourth interface;
the first pin of the right loudspeaker interface is connected with the third interface; the second pin of the right speaker interface is connected with the grounding module 300;
the first pin of the left loudspeaker interface is connected with the fourth interface; the second pin of the left speaker interface is connected to the grounding module 300.
Optionally, the capacitance module employs a transient diode.
Optionally, the filtering module includes: a first capacitor, a second capacitor and a third capacitor;
the first, second and third capacitances are nF scale capacitances.
Optionally, the capacitance module and the filtering module are connected in parallel and then connected to the second interface.
In this embodiment, a circuit diagram of an earphone circuit is further provided, referring to fig. 2, including: a loudspeaker SPK, a microphone MIC, a grounding wire GND and a plug J1; the microphone MIC is connected with a transient diode T1, a capacitor C1, a capacitor C2 and a capacitor C3 in parallel; an inductor B1 and a resistor R1 are connected in series between the microphone MIC and the plug J1; the speaker SPK is connected between the plug J1 and the ground line GND.
Specifically, a Transient diode T1 (TVS) improves the antistatic performance of the earphone, and at the same time, the TVS tube has a capacitance characteristic, such as 47pF, which plays a role of filtering; inductor B1 here uses inductance rather than reluctance because reluctance may present a better impedance characteristic at high frequencies, but may be detrimental to sound quality while inherently dc impedance may result in a reduction in sound volume.
Optionally, the plug J1 includes a first interface 1 and a second interface 2; the first interface 1 is connected with the ground line GND;
the second interface 2 is connected to the microphone MIC.
Optionally, the speaker SPK includes a right speaker interface SPK _ R and a left speaker interface SPK _ L; the plug J1 includes a third interface 3 and a fourth interface 4.
A first pin of the right speaker interface SPK _ R is connected to the third interface 3; a second pin of the right speaker interface SPK _ R is connected to the ground line GND;
a first pin of the left speaker interface SPK _ L is connected to a fourth interface 4; and a second pin of the left speaker interface SPK _ L is connected to the ground line GND.
Optionally, the transient diode T1 is connected in parallel with the capacitors C1, C2 and C3 and then connected to the second interface 2 of the plug J1.
Optionally, the capacitances C1, C2, C3 are nF-class capacitances.
Specifically, the audio frequency is mainly concentrated in the frequency range of 20 Hz-20 KHz, the effective voice frequency is 500 Hz-10 KHz, C1C1, C2 and C3 are selected as nF-level capacitors and are used as filter devices, so that the effective audio frequency is not obviously influenced, harmonic waves can be effectively inhibited, and the aims of improving interference resistance and distortion are fulfilled.
Example two
In another aspect, an embodiment of the present invention provides a mobile terminal, where the mobile terminal includes the earphone circuit as described in the first embodiment.
In particular, the mobile terminal may be a smartphone, a tablet, or a notebook computer.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
1) through setting up the electric capacity module, the antistatic performance of earphone has been promoted.
2) By providing an inductive module, better impedance characteristics can be presented at high frequencies.
3) Through setting up the filtering module, not only can not produce obvious influence to effective audio frequency, can effectively restrain the harmonic again simultaneously, reach and improve anti-interference and distortion purpose.
Under the condition of ensuring the electrical characteristic performance of the earphone, the anti-interference performance of the earphone is greatly improved, and the requirement of test authentication is met.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.