CN204836546U - Integrated form audio signal player - Google Patents
Integrated form audio signal player Download PDFInfo
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- CN204836546U CN204836546U CN201520597456.0U CN201520597456U CN204836546U CN 204836546 U CN204836546 U CN 204836546U CN 201520597456 U CN201520597456 U CN 201520597456U CN 204836546 U CN204836546 U CN 204836546U
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Abstract
The utility model discloses an integrated form audio signal player, including audio frequency treater, audio power amplifier, operational amplifier subassembly, the highest electrical level selector and level conversion ware, audio power amplifier and operational amplifier's output all is connected to the speaker, the two sets of audio signal of audio frequency treater output, an audio signal are earphone mode audio signal, and the 2nd audio signal is speaker mode audio signal, the audio frequency treater has two IO ports, and wherein first port is connected to the control end of operational amplifier subassembly for the break -make of control algorithm amplifier assembly, the second port is connected to audio power amplifier's control end for control audio power amplifier's break -make. The utility model discloses the analog switch of the operational amplifier subassembly replacement through type of adjustable gain is used, the controllable transmission of gaining of audio signal can be realized more, and reduce the space that occupies the system by a wide margin have better uniformity, stability and reliability.
Description
Technical field
The utility model relates to a kind of integrated form audio signal player, for taking smart mobile phone as the intelligent terminal field of representative.
Background technology
Current intelligent machine is fast-developing, and the competition of each cell phone manufacturer is also more and more fierce.In order to make product more competitive, how effectively utilizing mobile phone space to a greater degree, how more effective prerequisite decline low production cost of ensuring the quality of products, is the target that each Cell Phone Design research and development company is constantly pursued.
In general, receiver and the loud speaker of mobile phone are the different transit systems of two covers, its structural representation as shown in Figure 1, in the course of the work, base band controls the output of receiver by output EARP and EARN of receiver, output to outside audio-frequency power amplifier Audio_PA additionally by audio output Audio_P and Audio_N, and drive loud speaker by this audio-frequency power amplifier Audio_PA, realize the output of audio signal.As can be seen from the figure, within the system, because the receiver of mobile phone and loud speaker two overlap independently path, so not only can take more nervous system space, also improve the cost of design simultaneously.
Along with the development of technology, the two-in-one scheme of receiver and loud speaker two systems by utility model out, and promoted the use of gradually, structural representation as shown in Figure 2, in the course of the work, base band passes through startup and the shutoff of GPIO port GPIO_0 and GPIO_1 difference control simulation switch and audio-frequency power amplifier, and the two can only select a unlatching at one time, namely, in time selecting audio-frequency power amplifier work, the playing function of audio frequency at loud speaker is realized; In time selecting analog switch conducting, realize handset function.But because audio-frequency power amplifier generally understands the higher D-type audio power amplifier of efficiency of selection, its output terminals A OUP, AOUN are the PWM waveform that duty ratio changes along with audio frequency signal amplitude, and general high level can reach about 3.2V ~ 6.5V.And the power vd D2 of analog switch is directly powered by battery, voltage range is generally change between 3.2V ~ 4.35V.Analog switch internal circuit as shown in Figure 3, first control signal EN_SW realizes the conversion of voltage from VL to VDD2 through level translator LevelShift, wherein, VL is the PMIC (PowerManagementIC of base band, power management integrated circuit) power supply that produces, be generally between 1.8V ~ 2.8V.The the second control signal PDB produced after level translator LevelShift as the first control signal EN_SW is high level VDD2, and analog switch cuts out.
When analog switch cuts out time, the waveform of each port of metal-oxide-semiconductor P3 as shown in Figure 4.In figure, metal-oxide-semiconductor P5 and N1 device are the internal circuit that audio process inside is connected with port INP, and wherein diode D4 and D3 is respectively the parasitic diode of metal-oxide-semiconductor P5 and N1.When analog switch turns off, metal-oxide-semiconductor P5 and N1 is generally be off state, then INP end is high-impedance state.The grid voltage control voltage of metal-oxide-semiconductor P3 is VDD2, and as the output level VDD3≤VDD2+Vth of OUP end (wherein, Vth is the conduction threshold of P1), P3 pipe can turn off completely.The change in voltage of OUP end, on the not impact of INP end.Parasitic diode D4 does not have and instead fills with electric current, because the path of OUP to INP is completely cut off completely, so the level of OUP end does not affect audio process internal circuit.But as VDD3 > VDD2+Vth, although the grid-control voltage of analog switch is VDD2, metal-oxide-semiconductor P3 is still in conducting state.The level of output OUP directly can be transferred to INP end.Because the level of power vd D1 is generally 1.8V ~ 2.8V, when OUP exports high level VDD3, because the value of VDD3 is much larger than the conduction threshold of VDD1 and parasitic diode D4, that is: VDD3>>VDD1+Vth_D4.So VDD3 can produce very high electric current by metal-oxide-semiconductor P3 at D4 end, and the anti-power vd D1 that is poured into holds.The anti-filling electric current of D4 as shown in Figure 5.The existence of anti-filling electric current, is easy to the damage causing audio process internal components.
Meanwhile, the device that audio process inside is connected with INP, be all generally low-voltage device, breakdown voltage point generally can be lower.When the high level of OUP end is delivered to audio process inside, have the risk causing the breakdown damage of expendable N1 equally.
In addition, due to anti-existence of filling with electric current, OUP end is when high level output, and voltage is dragged down rapidly, causes the distortion of output waveform, distortion, the extreme degradation quality of audio signal.Equally, because VDD1 is poured into electric current in moment, very easily cause the disorder of the voltage status of VDD1, and then cause the operation irregularity of whole system.
For the two-in-one scheme of traditional discrete device, in time having output boost function in audio-frequency power amplifier, larger anti-filling electric current can be caused; And when audio-frequency power amplifier export there is no a boost function time, also due to the discrete analog switch module of outside, and occupy system area, and the various problems such as signals gain loss, stability and consistency can be with poor.
Utility model content
The purpose of this utility model exists instead fill with electric current for solving receiver traditional at present and the two-in-one audio signal player of loud speaker, cause device breakdown, output waveform distortion, distortion, the quality of extreme degradation audio signal, make the operation irregularity of whole system, and occupy system area, cause the technical problem of Signal transmissions gain loss, stable difference property and consistency difference.
In order to solve the problems of the technologies described above, the utility model embodiment provides a kind of integrated form audio signal player, comprising: audio process, Audio Controller and loud speaker;
Described Audio Controller comprises audio-frequency power amplifier, components for operational amplifier, maximum level selector and level translator, described audio-frequency power amplifier is used for the amplification of speaker mode audio signal, described components for operational amplifier is used for the amplification of handset mode audio signal, and the output of described audio-frequency power amplifier and operational amplifier is all connected to described loud speaker;
Described audio process exports two groups of audio signals, and the first audio signal is handset mode audio signal, and described first audio signal is connected to described components for operational amplifier input; Second audio signal is speaker mode audio signal, and described second audio signal is connected to described audio-frequency power amplifier input;
Described audio process has two I/O ports, and wherein the first port is connected to the control end of described components for operational amplifier, for the break-make of control algorithm amplifier block; Second port is connected to the control end of described audio-frequency power amplifier, for controlling the break-make of audio-frequency power amplifier; Described first port is also connected to described level translator input;
Described maximum level selector is used for selecting maximum level from the positive input level of the power level of described audio-frequency power amplifier, described loud speaker and the negative input level of described loud speaker, namely described maximum level selector exports described maximum level, and described maximum level supplies described components for operational amplifier and described level translator;
The level conversion that described level translator is used for described first port to export is to described maximum level, and namely described level translator exports described maximum level, and described maximum level supplies described components for operational amplifier.
Further, described components for operational amplifier comprises the transistor input circuit of operational amplifier and described operational amplifier, and described transistor input circuit comprises positive end transistor input circuit and negative terminal transistor input circuit; Between the positive input terminal that described positive end transistor input circuit is parallel to described operational amplifier and negative output terminal, between the negative input end that described negative terminal transistor input circuit is parallel to described operational amplifier and positive output end; Described transistor input circuit comprises transistor.
Further, the transistor in described transistor input circuit is PMOS, and the maximum level that described maximum level selector exports puts on the source electrode of described PMOS.
Further, the first port of described audio process is connected to the control end of described operational amplifier; Second port of described audio process is connected to the control end of described audio-frequency power amplifier; The maximum level that described level translator exports puts on the grid of described PMOS.
Further, between the source electrode and drain electrode of described PMOS, be parallel with parasitic diode, the anode of parasitic diode is connected to the drain electrode of PMOS.
Further, when described first port is low level, described operational amplifier path is open-minded, and the conducting of described transistor input circuit, when described first port is high level, described operational amplifier path turns off, and the cut-off of described transistor input circuit; When described second port is low level, described audio-frequency power amplifier path turns off, and when described second port is high level, described audio-frequency power amplifier path is open-minded.
Further, the anode of described first audio signal is connected to the positive input terminal of described operational amplifier, and the negative terminal of described first audio signal is connected to the negative input end of described operational amplifier; The positive output end of described operational amplifier is connected to the positive input terminal of described loud speaker, and the negative output terminal of described operational amplifier is connected to the negative input end of described loud speaker.
Further, the anode of described second audio signal is connected to the positive input terminal of described audio-frequency power amplifier, and the negative terminal of described second audio signal is connected to the negative input end of described audio-frequency power amplifier; The positive output end of described audio-frequency power amplifier is connected to the positive input terminal of described loud speaker, and the negative output terminal of described audio-frequency power amplifier is connected to the negative input end of described loud speaker.
Further, described transistor input circuit is in series by described transistor AND gate adjustable resistance.
Further, also before described transistor input circuit, resistance is in series with.
The utility model uses the components for operational amplifier of adjustable gain to replace the analog switch of through type, can realize many gain controllable transmission of audio signal; Compatible audio-frequency power amplifier boosting/two kinds of mode of operations of not boosting, application has larger adaptability; After having stopped audio-frequency power amplifier boosting, high level has damaged the phenomenon of audio process internal components; Significantly reduce the space of the system of taking; There are better consistency, stability and reliability.
Accompanying drawing explanation
The audio signal player structure schematic diagram of the transit system that Fig. 1 to be receiver and the loud speaker of traditional mobile phone be two covers are different;
Fig. 2 is the two-in-one audio signal player structure schematic diagram of traditional receiver and loud speaker;
Fig. 3 is the internal circuit diagram of the simulant electronic switch shown in Fig. 2;
Fig. 4 for shown in Fig. 2 simulant electronic switch close time, the oscillogram of each port of metal-oxide-semiconductor P3;
Fig. 5 for shown in Fig. 2 simulant electronic switch close time, the anti-filling map of current of D4 in audio process;
Fig. 6 is the structure chart of the utility model embodiment integrated form audio signal player;
Fig. 7 is the utility model circuit theory diagrams;
Fig. 8 is the utility model control signal oscillogram.
Embodiment
In conjunction with the accompanying drawings and embodiments the utility model is described in further detail now.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present utility model are described in a schematic way, and therefore it only shows the formation relevant with the utility model, and it should not be construed as restriction of the present utility model.
As shown in Figure 6, the integrated form audio signal player of the utility model embodiment, comprises audio process, Audio Controller and loud speaker; Wherein Audio Controller comprises audio-frequency power amplifier, components for operational amplifier, maximum level selector and level translator, audio-frequency power amplifier is used for the amplification of speaker mode audio signal, components for operational amplifier is used for the amplification of handset mode audio signal, and the output of audio-frequency power amplifier and operational amplifier is all connected to loud speaker;
Audio process exports two groups of audio signals, and the first audio signal is handset mode audio signal, and handset mode audio signal is connected to components for operational amplifier input; Second audio signal is speaker mode audio signal, and speaker mode audio signal is connected to audio-frequency power amplifier input;
Audio process has two I/O ports, and wherein the first port I/O1 is connected to the control end of components for operational amplifier, for the break-make of control algorithm amplifier block; Second port I/O2 is connected to the control end of audio-frequency power amplifier, for controlling the break-make of audio-frequency power amplifier; First port I/O1 is also connected to level translator input;
Maximum level selector is used for selecting maximum level from the power level VBAT of audio-frequency power amplifier, the positive input level of loud speaker and the negative input level of loud speaker, namely maximum level selector exports maximum level, this maximum level supply components for operational amplifier and level translator;
The level conversion that level translator is used for the first port I/O1 to export is to above-mentioned maximum level, and namely level translator exports above-mentioned maximum level, this maximum level supply components for operational amplifier.
Particularly, as shown in Figure 7, components for operational amplifier comprises the transistor input circuit of operational amplifier and operational amplifier, and transistor input circuit comprises positive end transistor input circuit and negative terminal transistor input circuit; Positive end transistor input circuit is parallel between the positive input terminal IP1 of operational amplifier and negative output terminal OUTN, and negative terminal transistor input circuit is parallel between the negative input end IN1 of operational amplifier and positive output end OUTP; Transistor input circuit comprises PMOS transistor P1 and P2, and maximum level selector selects from VBAT, OUTP and OUTN the source electrode that maximum level VH puts on PMOS P1 and P2.
First port GPIO_0 of audio process is connected to the control end PD_amp of operational amplifier; Second port GPIO_1 of audio process is connected to the control end EN_AP of audio-frequency power amplifier; First port GPIO_0 of audio process is also connected to the input of level translator LevelShift, the maximum level VH that the power level VBAT of audio-frequency power amplifier and maximum level selector export is connected to two level input of LevelShift, and the output of LevelShift is connected respectively to the grid PD of PMOS P1 and P2.
Between the source electrode and drain electrode of PMOS P1, be parallel with parasitic diode D2, the anode of parasitic diode D2 is connected to the drain electrode of PMOS P1; Between the source electrode and drain electrode of PMOS P2, be parallel with parasitic diode D3, the anode of parasitic diode D3 is connected to the drain electrode of PMOS P2.
The anode EARP of the first audio signal is connected to the positive input terminal IP1 of operational amplifier, and the negative terminal EARN of the first audio signal is connected to the negative input end IN1 of operational amplifier; The positive output end OUTP of operational amplifier is connected to the positive input terminal of loud speaker, and the negative output terminal OUTN of operational amplifier is connected to the negative input end of loud speaker.
The anode Auido_P of the second audio signal is connected to the positive input terminal AIP of audio-frequency power amplifier, and the negative terminal Auido_N of the second audio signal is connected to the negative input end AIN of audio-frequency power amplifier; The positive output end OUTP of audio-frequency power amplifier is connected to the positive input terminal of loud speaker, and the negative output terminal OUTN of audio-frequency power amplifier is connected to the negative input end of loud speaker.
Positive end transistor input circuit is in series by PMOS P2 and adjustable resistance Rf2, and negative terminal transistor input circuit is in series by PMOS P1 and adjustable resistance Rf1.
Also before positive end transistor input circuit, be in series with resistance Rin2, before negative terminal transistor input circuit, be in series with resistance Rin1.
Due to the maximum level that VH is in three level, when audio-frequency power amplifier has boost process time, VH is identical with the higher level value after boosting; When audio-frequency power amplifier does not have boost process time, VH is equal with supply voltage VBAT.
So when P1, P2 turn off, no matter how audio-frequency power amplifier designs, and all can not there is the situation of the weak conducting of P1, P2, avoid the appearance of current flowing backwards phenomenon, and the device protected in audio process is not damaged simultaneously.
Operational amplifier in Fig. 7, it can be the various high performance amplifier comprising AB class operational amplifier, by regulating Rf1, Rf2 and Rin1, the ratio of Rin2, can realize the scale amplifying to IN1, IP1, the straight-through transfer function single relative to analog switch, has larger adjustment and application design space.When the utility model is used for mobile phone, when the audio output port inputting BB (BaseBand, base band) is more in short supply time, can AIP and IP1; AIN and IN1 is connected in chip exterior, so just can realize pair of input signals and output to receiver and trumpet end respectively, both save the output pin of BB, can not affect again the performance of audio signal, substantially increased the flexibility ratio of application.
For the control signal EN_AP of audio-frequency power amplifier, and the logical relation of the control signal PD of components for operational amplifier, as shown in Figure 8, when EN_AP is high level VDD2 time, open audio-frequency power amplifier path, for low level 0 time then close this path; When PD is low level 0 time, the transistor input circuit conducting of components for operational amplifier, time for high level VH, the transistor input circuit cut-off of components for operational amplifier.In addition, the break-make of the operational amplifier of components for operational amplifier is realized by the control end PD_amp of the first port GPIO_0 control algorithm amplifier of audio process, when GPIO_0 exports as low level, operational amplifier path is open-minded, when GPIO_0 exports as high level, operational amplifier path turns off.
During work, when the first port GPIO_0 of audio process exports as low level, the PD_amp be connected with GPIO_0 is low level, operational amplifier path is open-minded, and the level translator LevelShift be connected with GPIO_0 exports maximum level VH, VH is applied to the grid PD of PMOS P1 and P2, make the leakage of two PMOS, source conduction, then transistor input circuit conducting, the gain of operational amplifier can be regulated, when GPIO_0 exports as high level, the PD_amp be connected with GPIO_0 is high level, operational amplifier path turns off, and the cut-off of transistor input circuit, when the second port GPIO_1 of audio process exports as low level, the EN_AP be connected with GPIO_1 is low level 0, audio-frequency power amplifier path turns off, when the second port GPIO_1 of audio process exports as high level, the EN_AP be connected with GPIO_1 is high level VDD2, and audio-frequency power amplifier path is open-minded.By the logical process of chip internal, ensure operational amplifier path and audio-frequency power amplifier path at any time, a road conducting can only be had.
The above embodiment of the utility model uses the components for operational amplifier of adjustable gain to replace the analog switch of through type, can realize many gain controllable transmission of audio signal; Compatible audio-frequency power amplifier boosting/two kinds of mode of operations of not boosting, application has larger adaptability; After having stopped audio-frequency power amplifier boosting, high level has damaged the phenomenon of audio process internal components; Significantly reduce the space of the system of taking; There are better consistency, stability and reliability.
With above-mentioned according to desirable embodiment of the present utility model for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this utility model technological thought, can carry out various change and amendment completely.The technical scope of this utility model is not limited to the content on specification, must determine its technical scope according to right.
Claims (10)
1. integrated form audio signal player, is characterized in that, comprises audio process, Audio Controller and loud speaker;
Described Audio Controller comprises audio-frequency power amplifier, components for operational amplifier, maximum level selector and level translator, described audio-frequency power amplifier is used for the amplification of speaker mode audio signal, described components for operational amplifier is used for the amplification of handset mode audio signal, and the output of described audio-frequency power amplifier and operational amplifier is all connected to described loud speaker;
Described audio process exports two groups of audio signals, and the first audio signal is handset mode audio signal, and described first audio signal is connected to described components for operational amplifier input; Second audio signal is speaker mode audio signal, and described second audio signal is connected to described audio-frequency power amplifier input;
Described audio process has two I/O ports, and wherein the first port is connected to the control end of described components for operational amplifier, for the break-make of control algorithm amplifier block; Second port is connected to the control end of described audio-frequency power amplifier, for controlling the break-make of audio-frequency power amplifier; Described first port is also connected to described level translator input;
Described maximum level selector is used for selecting maximum level from the positive input level of the power level of described audio-frequency power amplifier, described loud speaker and the negative input level of described loud speaker, namely described maximum level selector exports described maximum level, and described maximum level supplies described components for operational amplifier and described level translator;
The level conversion that described level translator is used for described first port to export is to described maximum level, and namely described level translator exports described maximum level, and described maximum level supplies described components for operational amplifier.
2. integrated form audio signal player according to claim 1, it is characterized in that, described components for operational amplifier comprises the transistor input circuit of operational amplifier and described operational amplifier, and described transistor input circuit comprises positive end transistor input circuit and negative terminal transistor input circuit; Between the positive input terminal that described positive end transistor input circuit is parallel to described operational amplifier and negative output terminal, between the negative input end that described negative terminal transistor input circuit is parallel to described operational amplifier and positive output end; Described transistor input circuit comprises transistor.
3. integrated form audio signal player according to claim 2, is characterized in that, the transistor in described transistor input circuit is PMOS, and the maximum level that described maximum level selector exports puts on the source electrode of described PMOS.
4. integrated form audio signal player according to claim 3, is characterized in that, the first port of described audio process is connected to the control end of described operational amplifier; Second port of described audio process is connected to the control end of described audio-frequency power amplifier; The maximum level that described level translator exports puts on the grid of described PMOS.
5. the integrated form audio signal player according to claim 3 or 4, is characterized in that, between the source electrode and drain electrode of described PMOS, be parallel with parasitic diode, the anode of parasitic diode is connected to the drain electrode of PMOS.
6. integrated form audio signal player according to claim 5, it is characterized in that, when described first port is low level, described operational amplifier path is open-minded, and the conducting of described transistor input circuit, when described first port is high level, described operational amplifier path turns off, and the cut-off of described transistor input circuit; When described second port is low level, described audio-frequency power amplifier path turns off, and when described second port is high level, described audio-frequency power amplifier path is open-minded.
7. integrated form audio signal player according to claim 2, it is characterized in that, the anode of described first audio signal is connected to the positive input terminal of described operational amplifier, and the negative terminal of described first audio signal is connected to the negative input end of described operational amplifier; The positive output end of described operational amplifier is connected to the positive input terminal of described loud speaker, and the negative output terminal of described operational amplifier is connected to the negative input end of described loud speaker.
8. integrated form audio signal player according to claim 2, it is characterized in that, the anode of described second audio signal is connected to the positive input terminal of described audio-frequency power amplifier, and the negative terminal of described second audio signal is connected to the negative input end of described audio-frequency power amplifier; The positive output end of described audio-frequency power amplifier is connected to the positive input terminal of described loud speaker, and the negative output terminal of described audio-frequency power amplifier is connected to the negative input end of described loud speaker.
9. the integrated form audio signal player according to Claims 2 or 3, is characterized in that, described transistor input circuit is in series by described transistor AND gate adjustable resistance.
10. integrated form audio signal player according to claim 9, is characterized in that, also before described transistor input circuit, is in series with resistance.
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| CN201520597456.0U CN204836546U (en) | 2015-08-10 | 2015-08-10 | Integrated form audio signal player |
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| CN201520597456.0U CN204836546U (en) | 2015-08-10 | 2015-08-10 | Integrated form audio signal player |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106325809A (en) * | 2016-08-29 | 2017-01-11 | 厦门盈趣科技股份有限公司 | Method and device for controlling reversible transmission based on audio stream |
| CN106714031A (en) * | 2015-08-10 | 2017-05-24 | 上海芯望电子技术有限公司 | Integrated audio signal player |
-
2015
- 2015-08-10 CN CN201520597456.0U patent/CN204836546U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106714031A (en) * | 2015-08-10 | 2017-05-24 | 上海芯望电子技术有限公司 | Integrated audio signal player |
| CN106325809A (en) * | 2016-08-29 | 2017-01-11 | 厦门盈趣科技股份有限公司 | Method and device for controlling reversible transmission based on audio stream |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yin Hui Inventor after: Yu Weike Inventor before: Yin Hui |
|
| CB03 | Change of inventor or designer information | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170731 Address after: 201203, Shanghai, Pudong New Area, 3000 East Road, 1 blocks, C building, 7 floor Patentee after: Will Semiconductor Ltd. Address before: 200124, C, building 6, building 63, building 421, Rainbow Road, Pudong New Area, Shanghai Patentee before: Shanghai Xin Wang Electron Technology Co., Ltd |
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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151202 Termination date: 20190810 |
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| CF01 | Termination of patent right due to non-payment of annual fee |