CN203466965U - Wired earphone circuit with function of restraining 217 Hz noise interference - Google Patents
Wired earphone circuit with function of restraining 217 Hz noise interference Download PDFInfo
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- CN203466965U CN203466965U CN201320604688.5U CN201320604688U CN203466965U CN 203466965 U CN203466965 U CN 203466965U CN 201320604688 U CN201320604688 U CN 201320604688U CN 203466965 U CN203466965 U CN 203466965U
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Abstract
The utility model discloses a wired earphone circuit with a function of restraining 217 Hz noise interference. The wired earphone circuit comprises a microphone circuit and a horn circuit. The microphone circuit and the horn circuit are respectively connected with at least one stage of filter circuit, wherein the filter circuit is a LC or a pi-type filter circuit; and the connected at least one stage of filter circuit together with a microphone filter capacitor or a sound channel circuit filter capacitor filters the noise which is transmitted in a radiation conduction manner because the wired earphone line is too long. Filter elements are connected to the circuits and the other ends of the filter elements are grounded. The circuit structure enables the noise transmitted in a ground conduction manner to be filtered out. Therefore, after the existing wired earphone circuit is connected with the at least one stage of filter circuit and the filter elements, the noise transmitted to a microphone and a horn is eliminated, and no noise influence during conversation with the earphone is achieved.
Description
Technical field
The utility model relates to head circuit technical field, relates in particular to a kind of wired earphone circuit with suppressing 217Hz noise jamming function.
Background technology
Wired earphone, when being used in conjunction with mobile phone, is easily subject to GSM(global system for mobile communications) 900MHz, 1800MHz signal disturb, the noise that is 217Hz at voicefrequency circuit forming frequency.The signal of 217Hz is that the GSM radiofrequency signal in 4.62mS cycle forms after by the device envelope solution ripples such as electric capacity on circuit, is exactly directly by forming at VDD-to-VSS end after RFPA in addition.And the sonic propagation of making an uproar of 217Hz has two kinds of approach: a kind of is to propagate in the mode of conduction by VDD-to-VSS; The 2nd, in the mode of radiation, propagate.
Fig. 1, Fig. 2 and Figure 3 shows that wired earphone circuit of the prior art, this head circuit comprises microphone circuit and horn circuit.
Wherein Fig. 1 is cable earphone microphone circuit diagram, this cable earphone microphone circuit comprises microphone monomer J1_MIC, one end ground connection of this microphone monomer J1_MIC, the other end discharges with ESD(static respectively) protection device D1, microphone filter capacitor C5 and MIC signal input part be electrically connected to, and wherein the other end of protection device D1 and microphone filter capacitor C5 is distinguished ground connection; Also comprise key circuit 3; described key circuit 3 comprises divider resistance R1 that one end is electrically connected to respectively, answers button SW2 and protection device D2; the other end of this divider resistance R1 is electrically connected to MIC signal input part, wherein answers the other end difference ground connection of button SW2 and protection device D2.Fig. 2 is the R channel circuit in wired earphone dual track horn circuit, this R channel circuit comprises loudspeaker U1, these loudspeaker U1, the direct ground connection in one end, the other end is electrically connected to one end and the loud speaker input SPK_R of sound channel circuit filtering capacitor C 1 respectively, and also ground connection of the other end of sound channel circuit filtering capacitor C 1.Fig. 3 is the L channel circuit in wired earphone dual track horn circuit, this L channel circuit comprises loudspeaker U2, the direct ground connection in one end of these loudspeaker U2, the other end is electrically connected to one end and the loud speaker input SPK_L of sound channel circuit filtering capacitor C 2 respectively, and also ground connection of the other end of sound channel circuit filtering capacitor C 2.
Above-mentioned wired earphone circuit because wired earphone line is longer, and when call, the interference signal in the external world is easy to be coupled on holding wire and ground wire, and noise is propagated by radiation mode and ground conduction pattern.Only according to the microphone filter capacitor C5 in Fig. 1 and Fig. 2 circuit, sound channel circuit filtering capacitor C 1 and C2 carry out filtering, and filter effect is unsatisfactory, especially, in the situation that mobile phone transmission power is larger, still can hear the interference noise of 217Hz.Because the noise of 217Hz is in audiorange, so user is when using wired earphone call, can hear 217Hz noise at microphone or trumpet end again, affect speech quality.
Utility model content
The purpose of this utility model is to provide a kind of wired earphone circuit with suppressing 217Hz noise jamming function, and this circuit can effectively reduce the 217Hz noise using in wired earphone call.
For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of wired earphone circuit electricity with suppressing 217Hz noise jamming function comprises microphone circuit and horn circuit,
Described microphone circuit comprises microphone monomer, one end ground connection of described microphone monomer, the other end is electrically connected to protection device D1, microphone filter capacitor C5 and MIC signal input part respectively, the other end of described protection device D1 and described microphone filter capacitor C5 is ground connection respectively, and described MIC signal input part is also electrically connected to key circuit;
Described horn circuit comprises loudspeaker U1/U2, one end ground connection of described loudspeaker U1/U2, the other end is electrically connected to one end and the loud speaker input SPK_R/SPK_L of sound channel circuit filtering capacitor C 1/C2 respectively, and the other end ground connection of described sound channel circuit filtering capacitor C 1/C2;
In described microphone circuit, between described MIC signal input part and described microphone filter capacitor C5 and/or between described microphone filter capacitor C5 and the ungrounded end of described microphone monomer, access at least first-level filtering wave circuit, one end of described microphone monomer ground connection is by filter element L6 ground connection;
In described horn circuit, between described sound channel circuit filtering capacitor C 1/C2 and described loud speaker input SPK_R/SPK_L and/or between described sound channel circuit filtering capacitor C 1/C2 and the other end of described loudspeaker U1/U2, access at least first-level filtering wave circuit, one end of described loudspeaker ground connection is by filter element L3/L4 ground connection.
Optimal way is, the filter circuit accessing in described microphone circuit and described horn circuit comprises respectively at least one in inductance, magnetic bead, electric capacity, the LC filter circuit being formed by capacitor combination magnetic bead or inductance and π type filter circuit, electric capacity one end ground connection of described filter circuit.
Optimal way is in described microphone circuit, between described MIC signal input part and described microphone filter capacitor C5, to access LC filter circuit, the LC filter circuit of this access and described microphone filter capacitor C5 formation π type filter circuit; In described horn circuit, between described sound channel circuit filtering capacitor C 1/C2 and described loud speaker input SPK_R/SPK_L, access LC filter circuit, the LC filter circuit of this access and described sound channel circuit filtering capacitor C 1/C2 form π type filter circuit.
Optimal way is, described horn circuit is monophony circuit or by the dual track circuit of L channel circuit and R channel the electric circuit constitute.
Optimal way is that the filter element (L3, L4, L6) accessing in described microphone circuit and described horn circuit is inductance or magnetic bead.
Optimal way is, the ceramic condenser that the electric capacity in described microphone filter capacitor C5, the filter circuit that accesses in described microphone circuit and described horn circuit and described sound channel circuit filtering capacitor C 1/C2 all adopt pico farad level.
Optimal way is, described microphone filter capacitor C5 is 33pF, electric capacity in the filter circuit of described microphone circuit access is 18pF, and described sound channel circuit filtering capacitor C 1/C2 is 18pF, and the electric capacity in the filter circuit accessing in described horn circuit is 33pF.
Adopt after technique scheme, the beneficial effects of the utility model are: because the wired earphone circuit with suppressing 217Hz noise jamming function described in the utility model comprises microphone circuit and horn circuit, in microphone circuit, be provided with microphone filter capacitor, in horn circuit, be provided with sound channel circuit filtering electric capacity, microphone circuit and horn circuit access respectively at least first-level filtering wave circuit, after the access of this filter circuit with microphone filtered electrical perhaps together with sound channel circuit filtering electric capacity, the noise 217Hz filtering that will propagate with radiation mode by wired earphone line.Microphone circuit, horn circuit are equipped with the filter element of one end ground connection simultaneously, and the other end of this filter element is electrically connected to the ungrounded end of the ungrounded end of microphone monomer or loudspeaker.The access way of this filter element is by the noise 217Hz filtering of propagating by ground conduction pattern.Make the tonequality of the utility model when conversing with earphone cord high, do not have noisy impact.
Accompanying drawing explanation
Fig. 1 is the cable earphone microphone circuit of prior art;
Fig. 2 is the R channel circuit in the wired earphone dual track horn circuit of prior art;
Fig. 3 is the L channel circuit in the wired earphone dual track horn circuit of prior art;
Fig. 4 is the cable earphone microphone circuit of the utility model embodiment mono-;
Fig. 5 is the R channel circuit in the wired earphone dual track horn circuit of the utility model embodiment mono-;
Fig. 6 is the L channel circuit in the wired earphone dual track horn circuit of the utility model embodiment mono-;
Fig. 7 is the cable earphone microphone circuit of the utility model embodiment bis-;
Fig. 8 is the sound channel circuit of the wired earphone monophony horn circuit of the utility model embodiment bis-;
Fig. 9 is the cable earphone microphone circuit of the utility model embodiment tri-;
Figure 10 is the sound channel circuit of the wired earphone monophony horn circuit of the utility model embodiment tri-;
Wherein: 1-key circuit, 2-π type filter circuit, 3-T-shaped filter circuit, 4-shunt capacitance formula filter circuit.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Embodiment mono-:
As shown in Figure 4, Figure 5 and Figure 6, a kind of wired earphone circuit with suppressing 217Hz noise jamming function comprises microphone circuit and horn circuit.
The electrical connection of the utility model microphone circuit and filter effect are: wherein microphone circuit comprises microphone monomer J1_MIC; one end ground connection of this microphone monomer J1_MIC; the other end is electrically connected to protection device D1, microphone filter capacitor C5 and MIC signal input part respectively; wherein the other end of protection device D1 and microphone filter capacitor C5 is distinguished ground connection, and MIC signal input part is electrically connected to key circuit 3.Between the MIC of microphone circuit signal input part and microphone filter capacitor C5, access one-level LC filter circuit, comprise magnetic bead L5 and capacitor C 6.This LC filter circuit and microphone filter capacitor C6 form π type filter circuit 2; This π type filter circuit 2 by two stage filter by the noise filtering conducting by radiation mode.And at the filter element L6 of earth terminal access one end of microphone monomer J1_MIC ground connection, this filter element L6 is magnetic bead, and this magnetic bead L6 is by the noise filtering of propagating by ground conduction pattern.
Electrical connection and the filter effect of the utility model R channel circuit are: wherein R channel circuit comprises loudspeaker U1, the direct ground connection in one end of these loudspeaker U1, the other end is electrically connected to one end and the loud speaker input SPK_R of sound channel circuit filtering capacitor C 1 respectively, and the other end ground connection of sound channel circuit filtering capacitor C 1.Between the sound channel circuit filtering capacitor C 1 of R channel circuit and loud speaker input SPK_R, access one-level LC filter circuit, this LC filter circuit comprises magnetic bead L1 and capacitor C 3, and magnetic bead L1 and capacitor C 3 and sound channel circuit filtering capacitor C 1 formation π type filter circuit 2; This π type filter circuit 2 by two stage filter by the noise filtering conducting by radiation mode.And at the filter element L3 of earth terminal access one end of loudspeaker U1 ground connection, this filter element L3 is magnetic bead, the noise filtering that this magnetic bead L3 will propagate by ground conduction pattern.
Electrical connection and the filter effect of the utility model L channel circuit are: wherein do sound channel circuit and comprise loudspeaker U2, the direct ground connection in one end of these loudspeaker U2, the other end is electrically connected to one end and the loud speaker input SPK_L of sound channel circuit filtering capacitor C 2 respectively, and the other end ground connection of sound channel circuit filtering capacitor C 2.Between the sound channel circuit filtering capacitor C 2 of L channel circuit and loud speaker input SPK_L, access one-level LC filter circuit, this filter circuit comprises magnetic bead L2 and capacitor C 4, and magnetic bead L2 and capacitor C 4 form π type filter circuits 2 with sound channel circuit filtering capacitor C 4; This π type filter circuit 2 by two stage filter by the noise filtering conducting by radiation mode.And at the filter element L4 of earth terminal access one end of loudspeaker U2 ground connection, this filter element L4 is magnetic bead, the noise filtering that this magnetic bead L4 will propagate by ground conduction pattern.
Above-mentioned microphone filter capacitor C5 is 33pF, and Mike's wind scale filter capacitor C6 is 18pF, and sound channel circuit filtering capacitor C 1/C2 is 18pF, and sound channel circuit level filter capacitor C3/C4 is 33pF.
Above-mentioned magnetic bead is in fact an inductor, on function, effect and composition, has its feature.The basic function of inductance is circuit resonance and chokes reactance.Be mainly used in the occasions such as power circuit, clock generating circuit, radio frequency (RF) and wireless telecommunications, wireless remote-control system.The major function of magnetic bead is to eliminate to be present in the RF noise in circuit, the role who is playing the part of alternating-current resistance (attenuator), it allows direct current signal to pass through, but high-frequency signal that can be more than filtering 30MHz, be mainly used in the filtering between analog circuit and digital circuit, I/O (I/O) port circuit, between radio frequency (RF) circuit and the logical device that is easily disturbed, power circuit and need to suppress the occasions such as EMI.
The effect of magnetic bead is mainly under high-frequency, to utilize inductance composition reflecting background, utilizes resistance components that noise is converted to heat, plays thus the effect that suppresses noise.During use, as long as directly insert in holding wire, power line just to suppress noise to reach the object of anti-EMI by absorbing, reflect to realize.Magnetic bead has very high resistivity and magnetic permeability, and it is equivalent to resistance and inductance series connection, but resistance value and inductance value are all the functions of frequency.It has better High frequency filter characteristic than common inductance, presents resistive when high frequency, so can keep higher good characteristic in quite wide frequency range.And inductance mainly plays energy storage, filtering, impedance, chokes, resonance and transformer action.
Magnetic bead is made by oxygen magnet material, and inductance is comprised of magnetic core and coil, and magnetic bead is converted into heat energy AC signal, and inductance stores electric current, discharges slowly.
Embodiment bis-:
As shown in Figure 7 and Figure 8, embodiment bis-and embodiment mono-are basic identical, difference is that wired earphone horn circuit is monophony circuit, this monophony circuit is the same with the circuit structure of L channel circuit with the R channel circuit of dual track horn circuit, and the present embodiment be take the R channel circuit of dual track horn circuit and is basis; Microphone circuit access secondary filter circuit, is specially the inductance L 5 between access MIC signal input part and microphone filter capacitor C5, the inductance L 7 of the ungrounded end of access microphone filter capacitor C5 and microphone monomer J1_MIC.This inductance L 5 and inductance L 7 form T-shaped filter circuit 3 with microphone filter capacitor C5.Horn circuit access secondary filter circuit, is specially the inductance L 1 between access loud speaker input SPR_R and sound channel circuit filtering capacitor C 1, accesses the inductance L 8 between earth terminal that flies of sound channel circuit filtering capacitor C 1 and loudspeaker U1; This inductance L 1 and inductance L 8 form T-shaped filter circuit 3 with sound channel circuit filtering capacitor C 1.Above-mentioned T-shaped filter circuit 3 is by the noise filtering conducting by radiation mode.And inductance value can be calculated according to the interference signal on filtering ground wire.
Embodiment tri-:
As shown in Figure 9 and Figure 10, embodiment tri-and embodiment bis-are basic identical, difference is microphone circuit access shunt capacitance formula filter circuit 4, comprises capacitor C 60 and capacitor C 61, between this filter circuit access MIC signal input part and microphone filter capacitor C5; And the capacitor C 60 of this filter circuit with capacitor C 61 together with microphone filter capacitor C5, by the noise filtering conducting by radiation mode.Horn circuit access shunt capacitance formula filter circuit 4 is to comprise capacitor C 10 and capacitor C 11, between this filter circuit access capacitor C 10 and capacitor C 11 access loud speaker input SPR_R and sound channel circuit filtering capacitor C 1; And the capacitor C 10 of this filter circuit with capacitor C 11 together with sound channel circuit filtering capacitor C 1, by the noise filtering conducting by radiation mode.
In other embodiment of the present utility model, in described microphone circuit, between described MIC signal input part and described microphone filter capacitor C5 and/or between the ungrounded end of described microphone filter capacitor C5 and described microphone monomer, can connect an access inductance (magnetic bead) or an electric capacity of access in parallel, form two stage filter or three grades of filtering with microphone filter capacitor C5, also can connect and access a plurality of inductance (magnetic bead), or a plurality of electric capacity of access in parallel, or inductance (magnetic bead) and electric capacity mix access, form multiple-stage filtering with microphone filter capacitor C5, electric capacity all adopts mode in parallel to be linked in circuit, i.e. electric capacity one end ground connection, and inductance (magnetic bead) all adopts the mode of series connection to be linked in circuit.Wherein, while connecting an inductance of access (magnetic bead) between described microphone filter capacitor C5 or between the ungrounded end of described microphone filter capacitor C5 and described microphone monomer, form LC two stage filter circuit with microphone filter capacitor C5.
Same, in other embodiment of the present utility model, in described horn circuit, between described sound channel circuit filtering capacitor C 1/C2 and described loud speaker input SPK_R/SPK_L and/or between the other end of described sound channel circuit filtering capacitor C 1/C2 and described loudspeaker U1/U2, can connect an access inductance (magnetic bead) or an electric capacity of access in parallel, form two stage filter or three grades of filtering with sound channel circuit filtering capacitor C 1/C2, also can connect and access a plurality of inductance (magnetic bead), or a plurality of electric capacity of access in parallel, or inductance (magnetic bead) and electric capacity mix access, form multiple-stage filtering with sound channel circuit filtering capacitor C 1/C2.Wherein, state between sound channel circuit filtering capacitor C 1/C2 and described loud speaker input SPK_R/SPK_L or the other end of described sound channel circuit filtering capacitor C 1/C2 and described loudspeaker U1/U2 between while connecting an inductance of access (magnetic bead), form LC two stage filter circuit with sound channel circuit filtering capacitor C 1/C2.
The above is of the present utility model is only preferred embodiment; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (7)
1. with the wired earphone circuit that suppresses 217Hz noise jamming function, comprise microphone circuit and horn circuit,
Described microphone circuit comprises microphone monomer, one end ground connection of described microphone monomer, the other end is electrically connected to protection device D1, microphone filter capacitor C5 and MIC signal input part respectively, the other end of described protection device D1 and described microphone filter capacitor C5 is ground connection respectively, and described MIC signal input part is also electrically connected to key circuit;
Described horn circuit comprises loudspeaker U1/U2, one end ground connection of described loudspeaker U1/U2, the other end is electrically connected to one end and the loud speaker input SPK_R/SPK_L of sound channel circuit filtering capacitor C 1/C2 respectively, and the other end ground connection of described sound channel circuit filtering capacitor C 1/C2;
It is characterized in that:
In described microphone circuit, between described MIC signal input part and described microphone filter capacitor C5 and/or between described microphone filter capacitor C5 and the ungrounded end of described microphone monomer, access at least first-level filtering wave circuit, one end of described microphone monomer ground connection is by filter element L6 ground connection;
In described horn circuit, between described sound channel circuit filtering capacitor C 1/C2 and described loud speaker input SPK_R/SPK_L and/or between described sound channel circuit filtering capacitor C 1/C2 and the other end of described loudspeaker U1/U2, access at least first-level filtering wave circuit, one end of described loudspeaker ground connection is by filter element L3/L4 ground connection.
2. the wired earphone circuit with suppressing 217Hz noise jamming function according to claim 1, it is characterized in that: the filter circuit accessing comprises respectively at least one in inductance, magnetic bead, electric capacity, the LC filter circuit being formed by capacitor combination magnetic bead or inductance and π type filter circuit electric capacity one end ground connection of described filter circuit in described microphone circuit and described horn circuit.
3. the wired earphone circuit with suppressing 217Hz noise jamming function according to claim 2, it is characterized in that: in described microphone circuit, between described MIC signal input part and described microphone filter capacitor C5, access LC filter circuit, the LC filter circuit of this access and described microphone filter capacitor C5 form π type filter circuit; In described horn circuit, between described sound channel circuit filtering capacitor C 1/C2 and described loud speaker input SPK_R/SPK_L, access LC filter circuit, the LC filter circuit of this access and described sound channel circuit filtering capacitor C 1/C2 form π type filter circuit.
According to described in claims 1 to 3 any one with the wired earphone circuit that suppresses 217Hz noise jamming function, it is characterized in that: described horn circuit is monophony circuit or by the dual track circuit of L channel circuit and R channel the electric circuit constitute.
5. the wired earphone circuit with suppressing 217Hz noise jamming function according to claim 4, is characterized in that: the filter element (L3, L4, L6) accessing in described microphone circuit and described horn circuit is inductance or magnetic bead.
According to described in claims 1 to 3 any one with the wired earphone circuit that suppresses 217Hz noise jamming function, it is characterized in that: the ceramic condenser that the electric capacity in described microphone filter capacitor C5, the filter circuit that accesses in described microphone circuit and described horn circuit and described sound channel circuit filtering capacitor C 1/C2 all adopt pico farad level.
7. according to the wired earphone circuit with inhibition 217Hz noise jamming function described in claims 1 to 3 any one, it is characterized in that: described microphone filter capacitor C5 is 33pF, electric capacity in the filter circuit of described microphone circuit access is 18pF, described sound channel circuit filtering capacitor C 1/C2 is 18pF, and the electric capacity in the filter circuit accessing in described horn circuit is 33pF.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320604688.5U CN203466965U (en) | 2013-09-27 | 2013-09-27 | Wired earphone circuit with function of restraining 217 Hz noise interference |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320604688.5U CN203466965U (en) | 2013-09-27 | 2013-09-27 | Wired earphone circuit with function of restraining 217 Hz noise interference |
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| CN203466965U true CN203466965U (en) | 2014-03-05 |
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| CN201320604688.5U Expired - Lifetime CN203466965U (en) | 2013-09-27 | 2013-09-27 | Wired earphone circuit with function of restraining 217 Hz noise interference |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103533487A (en) * | 2013-09-27 | 2014-01-22 | 潍坊歌尔电子有限公司 | Wired earphone circuit with function of suppressing 217Hz noise interference |
| CN106537932A (en) * | 2014-07-23 | 2017-03-22 | 三星电子株式会社 | Earset and earset operation method |
| CN107453344A (en) * | 2017-08-31 | 2017-12-08 | 广东欧珀移动通信有限公司 | Electrostatic protection apparatus, radio circuit and electronic equipment |
| CN107565530A (en) * | 2017-08-31 | 2018-01-09 | 广东欧珀移动通信有限公司 | Electrostatic protection apparatus, radio circuit and electronic equipment |
| CN108289266A (en) * | 2018-01-11 | 2018-07-17 | 上海展扬通信技术有限公司 | Dolby circuit and mobile terminal |
| CN111385717A (en) * | 2018-12-29 | 2020-07-07 | 比亚迪股份有限公司 | Audio output circuit and mobile terminal |
-
2013
- 2013-09-27 CN CN201320604688.5U patent/CN203466965U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103533487A (en) * | 2013-09-27 | 2014-01-22 | 潍坊歌尔电子有限公司 | Wired earphone circuit with function of suppressing 217Hz noise interference |
| CN106537932A (en) * | 2014-07-23 | 2017-03-22 | 三星电子株式会社 | Earset and earset operation method |
| US10225642B2 (en) | 2014-07-23 | 2019-03-05 | Samsung Electronics Co., Ltd. | Earset and earset operation method |
| CN106537932B (en) * | 2014-07-23 | 2019-05-28 | 三星电子株式会社 | Earphone and earphone operating method |
| CN107453344A (en) * | 2017-08-31 | 2017-12-08 | 广东欧珀移动通信有限公司 | Electrostatic protection apparatus, radio circuit and electronic equipment |
| CN107565530A (en) * | 2017-08-31 | 2018-01-09 | 广东欧珀移动通信有限公司 | Electrostatic protection apparatus, radio circuit and electronic equipment |
| CN108289266A (en) * | 2018-01-11 | 2018-07-17 | 上海展扬通信技术有限公司 | Dolby circuit and mobile terminal |
| CN111385717A (en) * | 2018-12-29 | 2020-07-07 | 比亚迪股份有限公司 | Audio output circuit and mobile terminal |
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