CN101710911B - Device for realizing audio switchover by using analog switch - Google Patents
Device for realizing audio switchover by using analog switch Download PDFInfo
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- CN101710911B CN101710911B CN2009102236573A CN200910223657A CN101710911B CN 101710911 B CN101710911 B CN 101710911B CN 2009102236573 A CN2009102236573 A CN 2009102236573A CN 200910223657 A CN200910223657 A CN 200910223657A CN 101710911 B CN101710911 B CN 101710911B
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Abstract
The invention discloses a device for realizing audio switchover by using an analog switch. The device comprises a base band processing chip, a hands-free Speaker, a D class power amplifier for driving the Speaker, the analog switch, a loudspeaker, an Earpiece, a matched resistor and a filter network, wherein, the Speaker is connected with the loudspeaker by the D class power amplifier, the first output end of the analog switch is connected with the Earpiece, the first input end of the analog switch is connected with the connection end between the loudspeaker and the D class power amplifier by the matched resistor and used for controlling whether to transmit the audio coming from the Earpiece, the base band processing chip is used for controlling the analog switch to connect or disconnect the connection between the Earpiece and the loudspeaker and turning on or off the D class power amplifier so that the loudspeaker plays the audio coming from the Speaker when the analog switch disconnects the connection between the Earpiece and the loudspeaker, the filter network is connected between the first input end and the matched resistor and used for performing high frequency inhibition to the audio coming from the Speaker. The invention reduces noise coupling.
Description
Technical field
The present invention relates to the communications field, realize the audio frequency device for switching in particular to a kind of use analog switch.
Background technology
At present, the realization in multitone source is seen everywhere on the industry terminal equipment, in low-end mobile phone, in order to reduce cost, will output on the same loudspeaker through the audio signal switching of control analog switch with the multitone source usually.
General, have receiver (Earpiece) and hands-free (Speaker) two sources of sound in the mobile phone, wherein; Speaker is if driven by AB class power amplifier, and then, it is no problem carrying out the audio frequency switching through analog switch again; But the efficient of AB class power amplifier is not as D class power amplifier, at present; Industry uses D class power amplifier to drive Speaker usually, particularly in some master control chips, has only the Speaker of D class power amplifier driving; Carry out the audio frequency switching through analog switch like this, again and will have following problem:
The burr amplitude of D class power amplifier output substantially exceeds the voltage input requirement of analog switch, analog switch is formed damage;
The signal frequency of D class power amplifier output is very high, can be in analog switch with coupling noise to other voice-frequency channels.
At present, carry out the audio frequency switching in the correlation technique and comprise following method:
A, direct-connected
Fig. 1 is the sketch map according to the direct-connected method circuit that carries out the audio frequency switching of correlation technique, and is as shown in Figure 1, through building network, Speaker and Earpiece directly linked loudspeaker, the control of each audio frequency realized the switching of audio signal through the master control chip.This method cost is low, realizes easily, but very risky, because also can there be the hidden danger of damaging the master control chip in Speaker with audio signal transmission to the Earpiece pin when driving loudspeaker, therefore, this method does not recommend to use.
B, analog switch
What the use analog switch carried out the audio frequency switching at present is conventional way; Fig. 2 is the sketch map that carries out the circuit of audio frequency switching according to the use analog switch of correlation technique; As shown in Figure 2, two inputs that Speaker and Earpiece are connected respectively to analog switch are connected loudspeaker with the public output of analog switch again, then; Through control, realize the switching of audio signal to analog switch.Compare with the method for using two loudspeaker, this method has reduced cost, is present more common method.But, problems such as analog switch damage that simple voice-frequency channel structure exists in the time of can not solving above-mentioned D class power amplifier driving audio frequency and coupling noise.
In sum, on terminal equipment, realize a kind of analog switch frequency switch circuit, neither can bring analog switch damage, coupling noise and influence problem such as user's impression, the effective economize on hardware cost of can trying one's best again, problem to be solved by this invention just.
Summary of the invention
Carry out causing when audio frequency switches analog switch damage, coupling noise to analog switch in the correlation technique; And then influence the problem of user impression and propose the present invention; For this reason; Main purpose of the present invention is to provide a kind of analog switch that uses to realize the scheme that audio frequency switches, one of to address the above problem at least.
To achieve these goals, according to an aspect of the present invention, provide a kind of use analog switch to realize the audio frequency device for switching.
Realize that according to use analog switch according to the present invention the audio frequency device for switching comprises: baseband processing chip, hands-free Speaker, be used to drive D class power amplifier, analog switch, loudspeaker, receiver Earpiece, the build-out resistor of Speaker; Also comprise: filter network; Wherein, Speaker is connected to loudspeaker through D class power amplifier; Whether first output of analog switch is connected to Earpiece, and the first input end of analog switch is connected to the link of loudspeaker and D class power amplifier through build-out resistor, be used to control to the audio frequency of loudspeaker transmission from Earpiece; Baseband processing chip; Be used to control analog switch and be switched on or switched off being connected of Earpiece and loudspeaker; And open or close D class power amplifier; So that loudspeaker are play the audio frequency from Speaker under the situation about being connected of analog switch disconnection Earpiece and loudspeaker, under the situation of analog switch connection Earpiece and loudspeaker, play audio frequency from Earpiece; Filter network is connected between first input end and the build-out resistor, is used for the audio frequency from Speaker is carried out high-frequency suppressing.
Preferably, the direct ground connection of second input of analog switch or through one or more element ground connection.
Preferably, D class power amplifier is integrated in the baseband processing chip.
Preferably, filter network is the RC circuit.
Preferably; Be under the situation of analog switch of multiple-input and multiple-output at analog switch; Said apparatus also comprises: the peripheral hardware chip, be connected to second output of analog switch, and be used for the 3rd input output audio through analog switch; Wherein, the 3rd input is connected to the link of Speaker and D class power amplifier.
Through the present invention; Employing is connected directly to loudspeaker with Speaker; The mode of filter network is set between the link of Speaker and loudspeaker and analog switch; Solved when analog switch carries out the audio frequency switching in the correlation technique and caused analog switch damage, coupling noise, and then influenced the problem of user's impression, and then reached the effect that minimizing coupling noise, raising user experience.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the sketch map according to the direct-connected method circuit that carries out the audio frequency switching of correlation technique;
Fig. 2 is the sketch map that carries out the circuit of audio frequency switching according to the use analog switch of correlation technique;
Fig. 3 is a structured flowchart of realizing the audio frequency device for switching according to the use analog switch of the embodiment of the invention;
Fig. 4 is a structured flowchart of realizing the audio frequency device for switching according to the use multiple-input and multiple-output analog switch of the embodiment of the invention;
Fig. 5 is the circuit block diagram according to the instance one of the embodiment of the invention;
Fig. 6 is the circuit block diagram according to the instance two of the embodiment of the invention;
Fig. 7 is a kind of circuit diagram according to the instance two of the embodiment of the invention;
Fig. 8 is the circuit block diagram according to the instance three of the embodiment of the invention;
Fig. 9 is the method flow diagram according to the audio frequency switching of the embodiment of the invention.
Embodiment
Functional overview
Consider that analog switch carries out causing when audio frequency switches analog switch damage, coupling noise in the correlation technique; And then influence the problem that the user experiences, and the invention provides a kind of analog switch that uses and realize the scheme that audio frequency switches, this scheme can be applied on the mobile phone terminal; Through being exported signal, source of sound is connected to analog switch; Connect loudspeaker by analog switch again, master control chip output control signal control analog switch, thus realize that audio frequency switches.Adopt this scheme; Thoroughly solved the damage problem that the Speaker that driven by D class power amplifier brings analog switch; Thoroughly solve simultaneously the Speaker that drives by D class power amplifier through the coupling noise problem that analog switch brings, improved user's result of use, effectively practiced thrift hardware cost.
Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.Below with reference to accompanying drawing and combine embodiment to specify the present invention.
In following examples; Can in computer system, carry out in the step shown in the flow chart of accompanying drawing such as a set of computer-executable instructions; And; Though logical order has been shown in flow chart, in some cases, can have carried out step shown or that describe with the order that is different from here.
According to embodiments of the invention, provide a kind of use analog switch to realize the audio frequency device for switching.
Fig. 3 is a structured flowchart of realizing the audio frequency device for switching according to the use analog switch of the embodiment of the invention; As shown in Figure 3; This device comprises: baseband processing chip 302, hands-free Speaker304, be used to drive D class power amplifier 306, analog switch 308, loudspeaker 310, the receiver Earpiece312 of Speaker304, build-out resistor 314 also comprises: filter network 316; Wherein
Speaker304 is connected to loudspeaker 310 through D class power amplifier 306; First output of analog switch 308 is connected to Earpiece312; Whether the first input end of analog switch 308 is connected to the link of loudspeaker 310 and D class power amplifier 306 through build-out resistor 314, be used to control to the audio frequency of loudspeaker 310 transmission from Earpiece312; Baseband processing chip 302; Be used to control analog switch 308 and be switched on or switched off being connected of Earpiece312 and loudspeaker 310; And open or close D class power amplifier 306; So that loudspeaker 310 are play the audio frequency from Speaker304 under the situation about being connected of analog switch 308 disconnection Earpiece312 and loudspeaker 310, under the situation of analog switch 308 connection Earpiece312 and loudspeaker, play audio frequency from Earpiece312; Filter network 316 is connected between first input end and the build-out resistor 314, is used for the audio frequency from Speaker304 is carried out high-frequency suppressing; Eliminated D class power amplifier output burr; Protected analog switch 308, and coupling noise there is booster action in the analog switch 308 to eliminating.
Wherein, the direct ground connection of second input of analog switch 308 or through one or more element ground connection.
Fig. 4 is a structured flowchart of realizing the audio frequency device for switching according to the use multiple-input and multiple-output analog switch of the embodiment of the invention, and as shown in Figure 4, D class power amplifier 306 can be integrated in the baseband processing chip.
Above-mentioned filter network 316 can be the RC circuit, also can be other filter network.
Be under the situation of analog switch of multiple-input and multiple-output at above-mentioned analog switch; Said apparatus also comprises: peripheral hardware chip 402, be connected to second output of analog switch 308, and be used for output audio; The 3rd input through analog switch 308 is connected to D class power amplifier 306; Drive output by D class power amplifier 306, wherein, the 3rd input is connected to the link of Speaker304 and D class power amplifier 306.
To combine instance that the implementation procedure of the embodiment of the invention is described in detail below.
The device that the embodiment of the invention adopts comprises with lower module: baseband processing chip, analog switch, loudspeaker and the circuit network that on voice-frequency channel, uses, and wherein, baseband processing chip is the master control chip, and the step that makes up this device comprises:
The first step: make up voice-frequency channel, Speaker through analog switch, is not directly connected on the loudspeaker.
Second step: the Earpiece connects the public output of analog switch, and an input of process analog switch is connected on the loudspeaker through build-out resistor.
The 3rd step: between build-out resistor and analog switch input, build filter network.
The 4th step: do not connect the input end grounding of build-out resistor in the analog switch, perhaps through certain grid grounding, for example, through one or more element ground connection.
The 5th step: master control chip output control signal, realize that through the control to analog switch audio frequency switches.
Instance one
Fig. 5 is the circuit block diagram according to the instance one of the embodiment of the invention, and is as shown in Figure 5, and 501 are the master control chip, and 502 is D class power amplifier, and 503 is the binary channel analog switch, and 504 is build-out resistor, and 505 is filter network, and 506 is loudspeaker.Direct-connected from the audio signal and the loudspeaker of the output of D class power amplifier, the audio signal of Earpiece output is connected to the public output of analog switch, again through linking loudspeaker through build-out resistor behind the input.When D class power amplifier output audio signal,, when Earpiece works, close Speaker and D class power amplifier through to the control disconnection of analog switch and being connected of Earpiece.
This design had both reduced cost, can avoid foregoing problem again, that is: 1, and avoid audio signal and the Earpiece audio signal of the output of D class power amplifier direct-connected, master chip is produced damage; 2, through the filter network of 505 formations, avoided the output of D class power amplifier that analog switch is caused damage; 3, with another input end grounding of analog switch or with other latticed form ground connection, when Speaker exports, Earpiece is connected with this input, can effectively reduce the coupling noise between the analog switch inner gateway.
Instance two
Fig. 6 is the circuit block diagram according to the instance two of the embodiment of the invention, and is as shown in Figure 6, and this circuit block diagram and instance one are similar; Difference is that D class power amplifier is integrated in the master control chip, and the i.e. audio signal of from chip, exporting for being driven by D class power amplifier is when Speaker exports; Through being connected of analog switch disconnection and Earpiece; When Earpiece exports, close Speaker and D class power amplifier in the master control chip, this pin is changed to high resistant.Fig. 7 is a kind of circuit diagram according to the instance two of the embodiment of the invention, and is as shown in Figure 7, and this circuit comprises following element: element U1 is a BBP high pass QSC11X0 master chip, inner integrated audio frequency output and D class power amplifier; Element S 1 is DPDT analog switch ISL54050, and S1 accomplishes the switching of Speaker/Earpiece voice-frequency channel under the control of BBP U1; Element Z1 is the tone playing equipment loudspeaker; Element R1, R2 are the build-out resistor of Earpiece voice-frequency channel; C1, C2 constitute the RC filter network with R1, R2 respectively, form high-frequency suppressing, thereby have reduced the damage of Speaker to analog switch; R3, R4 is a resistance, is used to reduce two coupling noise between the voice-frequency channel.
Instance three
Fig. 8 is the circuit block diagram according to the instance three of the embodiment of the invention; As shown in Figure 8; What this circuit block diagram and instance one were different is that analog switch is the output of multipath input multipath, the control of analog switch is realized the switching of different paths through master chip.802 is peripheral hardware chips, can output audio signal, need to drive output through D class power amplifier; For avoiding Speaker when work to damage the peripheral hardware chip, when its work, break off Line_in and Speaker through analog switch; And when the line_in output audio signal; Close Speaker and D class power amplifier in the master control chip, this pin is changed to high resistant, thereby protection master control chip is not damaged.
, the device of describing according to the embodiment of the invention is described in detail down in the face of carrying out the flow process that audio frequency switches.
Fig. 9 is the method flow diagram that switches according to the audio frequency of the embodiment of the invention, and is as shown in Figure 9, carries out the flow process that audio frequency switches according to the device of the embodiment of the invention and may further comprise the steps:
Step S901 according to user's operation, gets into the voice playing flow process;
Step S902 according to user's operation, selects voice-frequency channel to play, and judges whether to need to play the audio frequency from Earpiece;
Step S903 is judging that the control analog switch switches under the situation of selection broadcast from the audio frequency of Earpiece; Make analog switch connect being connected of Earpiece and loudspeaker; Simultaneously, close the D class power amplifier of Speaker output, the Spaeker end is changed to high-impedance state;
Step S904 judging under the situation do not select to play from the audio frequency of Earpiece, switches through the control analog switch, breaks off the path of Earpiece and loudspeaker, makes the audio frequency of loudspeaker broadcast from Spaeker;
Step S905, voice playing finishes.
In sum, adopt the present invention, solved the Speaker that drives by D class power amplifier, improved user's result of use, effectively practiced thrift hardware cost through the coupling noise problem that analog switch brings.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize by calculation element.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a use analog switch is realized the audio frequency device for switching; Comprise: baseband processing chip, loud speaker, be used to drive D class power amplifier, analog switch, loudspeaker, receiver, the build-out resistor of said loud speaker, it is characterized in that said device also comprises: filter network; Wherein
Said loud speaker is connected to said loudspeaker through said D class power amplifier;
First output of said analog switch is connected to said receiver; Whether the first input end of said analog switch is connected to the link of said loudspeaker and said D class power amplifier through said build-out resistor, be used to control to the audio frequency of said loudspeaker transmission from said receiver;
Said baseband processing chip; Be used to control said analog switch and be switched on or switched off being connected of said receiver and said loudspeaker; And open or close said D class power amplifier; So that said loudspeaker break off the audio frequency of playing under the situation about being connected of said receiver and said loudspeaker from said loud speaker at said analog switch, connect at said analog switch under the situation of said receiver and said loudspeaker and play audio frequency from said receiver;
Said filter network is connected between said first input end and the said build-out resistor, is used for the audio frequency from said loud speaker is carried out high-frequency suppressing.
2. device according to claim 1 is characterized in that, the direct ground connection of second input of said analog switch or through one or more element ground connection.
3. device according to claim 1 and 2 is characterized in that, said D class power amplifier is integrated in the said baseband processing chip.
4. device according to claim 1 and 2 is characterized in that, said filter network is the RC circuit.
5. device according to claim 1 and 2 is characterized in that, is that said device also comprises under the situation of analog switch of multiple-input and multiple-output at said analog switch:
The peripheral hardware chip is connected to second output of said analog switch, is used for the 3rd input output audio through said analog switch, and wherein, said the 3rd input is connected to the link of said loud speaker and said D class power amplifier.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102236573A CN101710911B (en) | 2009-11-19 | 2009-11-19 | Device for realizing audio switchover by using analog switch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102236573A CN101710911B (en) | 2009-11-19 | 2009-11-19 | Device for realizing audio switchover by using analog switch |
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| CN101710911A CN101710911A (en) | 2010-05-19 |
| CN101710911B true CN101710911B (en) | 2012-07-04 |
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| CN2009102236573A Expired - Fee Related CN101710911B (en) | 2009-11-19 | 2009-11-19 | Device for realizing audio switchover by using analog switch |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340563A (en) * | 2010-07-27 | 2012-02-01 | 上海闻泰电子科技有限公司 | Method for eliminating TDD (time division duplex) noise of FM (frequency modulation)-GSM (global system for mobile communications) mobile phone |
| CN102056052B (en) * | 2010-11-28 | 2014-02-12 | 青岛海信移动通信技术股份有限公司 | Audio switching circuit and mobile terminal with same |
| CN104734651B (en) * | 2015-03-26 | 2017-05-10 | 北京卓越信通电子股份有限公司 | Circuit for achieving power amplification of shared audios of analog audio source and differential audio source |
| CN108012220B (en) * | 2017-12-29 | 2020-04-07 | 上海艾为电子技术股份有限公司 | Audio processor |
| CN108900940B (en) * | 2018-06-21 | 2020-06-16 | 珠海市杰理科技股份有限公司 | Audio input circuit of direct coupling MCU direct push earphone |
| CN114157964B (en) * | 2021-12-15 | 2024-07-05 | 科大讯飞股份有限公司 | Audio circuit and device |
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| CN1356848A (en) * | 2000-11-29 | 2002-07-03 | 雅马哈株式会社 | Portable telephone |
| WO2004075602A1 (en) * | 2003-02-20 | 2004-09-02 | Sony Ercisson Mobile Communications Ab | Electronic driving circuit for directing an audio signal selectively to one of two speakers |
| CN200959665Y (en) * | 2005-12-29 | 2007-10-10 | 颜怀伟 | Double-magnetic loundspeaker with pickup-free handphone for mobile acoustic equipment and amplifying and controlling circuit |
| CN201118571Y (en) * | 2007-06-12 | 2008-09-17 | 中兴通讯股份有限公司 | A microphone audio input switch control circuit for dual-mode mobile phone |
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2009
- 2009-11-19 CN CN2009102236573A patent/CN101710911B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1356848A (en) * | 2000-11-29 | 2002-07-03 | 雅马哈株式会社 | Portable telephone |
| WO2004075602A1 (en) * | 2003-02-20 | 2004-09-02 | Sony Ercisson Mobile Communications Ab | Electronic driving circuit for directing an audio signal selectively to one of two speakers |
| CN200959665Y (en) * | 2005-12-29 | 2007-10-10 | 颜怀伟 | Double-magnetic loundspeaker with pickup-free handphone for mobile acoustic equipment and amplifying and controlling circuit |
| CN201118571Y (en) * | 2007-06-12 | 2008-09-17 | 中兴通讯股份有限公司 | A microphone audio input switch control circuit for dual-mode mobile phone |
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Effective date of registration: 20210105 Address after: 274300 Shanxian economic and Technological Development Zone, Heze City, Shandong Province Patentee after: SHANDONG YU HE TANG PHARMACEUTICAL CO.,LTD. Address before: 518057 No. 55 South Science and technology road, Shenzhen, Guangdong, Nanshan District Patentee before: ZTE Corp. |
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