CN102231770A - Mobile phone loudspeaker circuit and mobile terminal - Google Patents
Mobile phone loudspeaker circuit and mobile terminal Download PDFInfo
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- CN102231770A CN102231770A CN2011101895640A CN201110189564A CN102231770A CN 102231770 A CN102231770 A CN 102231770A CN 2011101895640 A CN2011101895640 A CN 2011101895640A CN 201110189564 A CN201110189564 A CN 201110189564A CN 102231770 A CN102231770 A CN 102231770A
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Abstract
The invention discloses a mobile phone loudspeaker circuit and a mobile terminal. The circuit comprises the following parts: an audio input terminal used for obtaining an audio signal and providing the signal to a D type audio frequency amplifier; the D type audio frequency amplifier which connects the audio input terminal and a loudspeaker and is used for amplifying the audio signal; and the loudspeaker used for receiving an amplified audio signal and emitting sound based on the amplified audio signal. According to the mobile phone loudspeaker circuit and the mobile terminal provided in the invention, sound outputted by the loudspeaker can be amplified through the D type audio frequency amplifier to satisfy demands of the elderly or people with poor hearing.
Description
Technical field
The present invention relates to the communication technology, relate in particular to a kind of mobile phone speaker circuit and portable terminal.
Background technology
In the prior art, the sound of mobile phone is all less, and is general all below 100 decibels, in public in, if audio frequency such as incoming call answering or playing back music, broadcasting, the user is normally undistinguished.Especially for the elderly, for sound at the mobile phone below 100 decibels, even under comparatively quiet environment, the elderly also may can't hear incoming ring tone or not hear the sound of the other side in the conversation, this may just need the other side constantly to repeat institute's what someone said, and the user of phone both sides has been caused very large puzzlement.
Generally solve mobile phone sound problem of smaller in the prior art by the mode of using earphone, this just needs the user all will carry earphone usually, when needs playing back music or incoming call answering, at first to rout up the earphone of carrying, this is to bringing great inconvenience for the user, and buys the cost that earphone is born for the user has increased.
Summary of the invention
The invention provides a kind of mobile phone speaker circuit and portable terminal, in order to increase the sound of mobile phone speaker output.
The embodiment of the invention provides a kind of mobile phone speaker circuit, comprising:
Audio input end is used to obtain audio signal, and sends to D class audio power amplifier;
Described D class audio power amplifier, described D class audio power amplifier is connected between described audio input end and the loud speaker, is used to amplify audio signal;
Described loud speaker is used to receive the audio signal of amplification and sounds according to the audio signal of described amplification.
Aforesaid mobile phone speaker circuit, preferably, described D class audio power amplifier comprises:
Preamplifier is used for the audio signal of input is carried out preposition amplification;
Modulator is used for audio signal with preposition amplification and is converted to high-frequency pulse signal through ovennodulation;
Logic control circuit is used to receive the on off state that described high-frequency pulse signal is forwarded to power switch and controls described power switch;
Described power switch is used to receive described high-frequency pulse signal and output feedback signal forming the audio signal of amplifying, and the audio signal of described amplification is offered described loud speaker.
Aforesaid mobile phone speaker circuit preferably, also comprises:
Protective circuit is used to detect the chip temperature of described D class audio power amplifier.
Aforesaid mobile phone speaker circuit preferably, also comprises: peripheral circuit, described peripheral circuit are used for described audio input end is offered the audio signal of described D class audio power amplifier and carry out filtering.
Aforesaid mobile phone speaker circuit preferably, also comprises:
Magnetic bead, described magnetic bead are connected between described loud speaker and the described D class audio power amplifier.
Aforesaid mobile phone speaker circuit, preferably, the resistance of described loud speaker is 3～4 ohm, supply voltage is 3.6V.
Aforesaid mobile phone speaker circuit, preferably, when the frequency of the audio signal of described amplification was 90～120MHz, the resistance of described magnetic bead was 500～700 ohm.
Aforesaid mobile phone speaker circuit, preferably, when the frequency of the audio signal of described amplification was 100MHz, the resistance of described magnetic bead was 600 ohm.
The present invention also provides a kind of portable terminal, comprises aforesaid mobile phone speaker circuit.
Mobile phone speaker circuit provided by the invention and portable terminal can increase the sound of loud speaker output by D class audio power amplifier, to satisfy the relatively poor crowd's of the elderly or hearing demand.
Description of drawings
Figure 1A is the mobile phone speaker electrical block diagram according to the embodiment of the invention one;
Figure 1B is the concrete structure schematic diagram according to the D class audio power amplifier of the embodiment of the invention one;
Fig. 2 is the structural representation according to the peripheral circuit of the embodiment of the invention one;
Fig. 3 is the mobile phone speaker circuit structure diagram according to the embodiment of the invention two.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.Need to prove that accompanying drawing all adopts very the form of simplifying and all uses non-ratio accurately, only in order to convenient, the purpose of the aid illustration embodiment of the invention clearly.
Embodiment one
Present embodiment one provides a kind of mobile phone speaker circuit, shown in Figure 1A, is the structural representation according to the mobile phone speaker circuit 100 of present embodiment one, and this mobile phone speaker circuit 100 comprises audio input end 101, D class audio power amplifier 102 and loud speaker 103.
Wherein, audio input end 101 is used for obtaining audio signal from built-in player, and offers D class audio power amplifier 102.Built-in player has a variety of implementations, for example MP3 etc.D class audio power amplifier 102 is connected between audio input end 101 and the loud speaker 103, is used to amplify the message signal; Loud speaker 103 is used to receive the audio signal of amplifying through D class power amplifirer 102 and according to the audio signal output sound of this amplification.The operation principle of D class audio power amplifier 102 is: the audio signal of input is through the modulation of modulator, thereby produce PWM (Pulse Width Modulation, pulse width modulation) signal, that is, use that the amplitude of simulated audio signal modulates that a series of width are modulated or duty ratio is modulated etc. the amplitude pulse signal.And original simulated audio signal is not to be included among the amplitude of this pulse signal, and is included among its width or duty ratio.So D class audio power amplifier 102 produces distortion and can't make original audio signal produce distortion when amplifying audio signal on the amplitude.Amplifier in the D class audio power amplifier 102 in this case just can be fully operational on off state, is fully operational in cut-off state when not having signal, thereby obtains very high conversion efficiency.
Shown in Figure 1B, be an instantiation of D class audio power amplifier 102.This D class audio power amplifier 102 specifically comprises: preamplifier 201, modulator 202, logic control circuit 203 and power switch 204.Preamplifier 201 is connected with audio input end 101, is used for the audio signal of input is carried out preposition amplification; Modulator 202 is connected with logic control circuit 203 with preamplifier 201 respectively, be used for audio signal with preposition amplification and be converted to high-frequency pulse signal through ovennodulation, and high-frequency pulse signal is sent to logic control circuit 203, logic control circuit 203 is connected with power switch 204, be used to receive high-frequency pulse signal and be forwarded to power switch 204, power switch 204 is connected with loud speaker 103, be used to receive high-frequency pulse signal also according to the high-frequency signal output feedback signal that receives, form final audio signal through amplifying, and to the audio signal of loud speaker 103 outputs through the amplification of adjustment.Because whole D class audio power amplifier 102 is generally made a chip; so can also also comprise protective circuit 205 by this D class audio power amplifier 102; this protective circuit 205 is used for the temperature of the chip of this D class audio power amplifier 102 is monitored; when the too high phenomenon of temperature takes place; the output cut-off signals is given logic control circuit 203, the work of rupturing duty switch 204.Protective circuit 205 is the electric current of monitoring power switch 204 also; when the output short-circuit phenomenon takes place; export cut-off signals immediately and give logic control circuit 203; the work of rupturing duty switch 204, the specific implementation of protective circuit 205 can adopt overcurrent protection of the prior art and overtemperature protection device to realize.
Mobile phone speaker circuit 100 can also comprise peripheral circuit, and peripheral circuit is used for audio input end 101 is carried out filtering to the audio signal that D class audio power amplifier 102 sends.Particularly, peripheral circuit comprises as shown in Figure 2: first resistance 301, second resistance 302, first electric capacity 303, second electric capacity 304, the 3rd electric capacity 305, the 3rd resistance 306, the 4th resistance 307, the 4th electric capacity 308 and inductance 309.An end ground connection of first resistance 301 wherein, the other end is connected with second electric capacity 304; One end of second resistance 302 links to each other with audio input end 101, and the other end is connected with the 3rd electric capacity 305; Second electric capacity 304 connects the positive input of the preamplifier in the D class audio power amplifier 102; The 3rd electric capacity 305 connects the reverse input end of the preamplifier in the D class audio power amplifier 102; One end of first electric capacity 303 is connected between first resistance 301 and second electric capacity 304, and the other end is connected between second resistance 302 and the 3rd electric capacity 305.First electric capacity 303, second electric capacity 304 and the 3rd electric capacity 305 are filtering capacitances.The comparator input terminal of the logic control circuit in one end of the 3rd resistance 306 and the D class audio power amplifier 102 is connected, and the other end is connected between the 4th resistance 307 and the D class audio power amplifier 102; The output of the comparator of the logic control circuit in the one end ground connection of the 4th resistance 307, the other end and D class audio power amplifier 102 is connected; The 3rd resistance 306 and the 4th resistance 307 are used to regulate output voltage; One end ground connection of the 4th electric capacity 308, the other end connects inductance 309; The 4th electric capacity 308 is used for filtering.To the audio signal of D class audio power amplifier 102 inputs,, again the audio signal of amplifying is imported loud speaker 103 in order to sound by these peripheral circuits through the amplification of D class audio power amplifier 102 through Filtering Processing.
According to above-mentioned mobile phone speaker circuit 100, when the battery of mobile phone of loud speaker, 3.6V that uses 3～4 ohm, the power of D class audio power amplifier 102 can reach more than the 2.7W.So just make the intensity of sound of mobile phone be increased to more than 100 decibels.
Mobile phone speaker circuit 100 according to present embodiment, be connected D class audio power amplifier 102 between audio input end 101 and the loud speaker 103 by employing, can make that the sound that plays back by loud speaker 103 is bigger, to be adapted at audio frequency such as public arena playing back music or film, further, satisfy other relatively poor crowd of the elderly or hearing demand.
Embodiment two
Present embodiment two provides embodiment one is carried out improved mobile phone speaker circuit, as shown in Figure 3, is the structural representation according to the mobile phone speaker circuit 200 of present embodiment two.
This mobile phone speaker circuit 200 comprises: magnetic bead 250, be connected between D class audio power amplifier 102 and the loud speaker 103, and other structure of this mobile phone speaker circuit 200 is all identical with embodiment one, no longer gives unnecessary details at this.
This magnetic bead 250 is used to improve the compatibility of D class audio power amplifier 102, reduces its electromagnetic interference to other function of mobile phone, makes that the sound of loud speaker 103 outputs is clearer.This be because, radio-frequency (RF) energy is the AC sine wave component that is superimposed upon on the direct current transmission level, flip-flop is mobile phone speaker circuit 200 needed useful signals, radio-frequency (RF) energy but is useless electromagnetic interference, it is along circuit transmission and radiation.Magnetic bead 250 can only allow direct current signal to pass through, the filtering AC signal.Like this, have too much radiofrequency signal and make and reduce and disturb under the bigger situation of interference in the audio signal that D class audio power amplifier 102 is amplified.
Preferably, when the frequency of the audio signal of the amplification by D class audio power amplifier 102 was 90～120MHz, the resistance of described magnetic bead 250 was chosen as 500～700 ohm.More preferably, when the audio signal of amplifying by D class audio power amplifier 102 was 100MHz, the resistance of described magnetic bead 250 was chosen as 600 ohm.Show that according to experiment the frequency of the audio signal that process D class audio power amplifier 102 amplifies and the resistance of magnetic bead 250 are under such combination, loud speaker 103 is not only loud, and sound is clear, and effect obviously is better than the combination of other type.
Present embodiment of the present invention also provides a kind of portable terminal, can comprise the mobile phone speaker circuit that any embodiment of the present invention provides.The sound of this portable terminal is bigger, is adapted at that the public arena receives calls, audio frequency such as broadcast listening or music, especially for the elderly, can be easy to hear the sound of the other side in incoming ring tone and the conversation.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (9)
1. a mobile phone speaker circuit is characterized in that, comprising:
Audio input end is used to obtain audio signal, and sends to D class audio power amplifier;
Described D class audio power amplifier, described D class audio power amplifier is connected between described audio input end and the loud speaker, is used to amplify audio signal;
Described loud speaker is used to receive the audio signal of amplification and sounds according to the audio signal of described amplification.
2. mobile phone speaker circuit according to claim 1 is characterized in that, described D class audio power amplifier comprises:
Preamplifier is connected with described audio input end, is used for the audio signal of input is carried out preposition amplification;
Modulator is connected with described logic control circuit with described preamplifier respectively, is used for audio signal with preposition amplification and is converted to high-frequency pulse signal through ovennodulation;
Logic control circuit is connected with described power switch, is used to receive the on off state that described high-frequency pulse signal is forwarded to power switch and controls described power switch;
Described power switch is connected with described loud speaker, is used to receive described high-frequency pulse signal and output feedback signal forming the audio signal of amplifying, and the audio signal of described amplification is offered described loud speaker.
3. mobile phone speaker circuit according to claim 1 is characterized in that, also comprises:
Protective circuit is used to detect the chip temperature of described D class audio power amplifier.
4. mobile phone speaker circuit according to claim 1 is characterized in that, also comprises: peripheral circuit, described peripheral circuit are used for described audio input end is offered the audio signal of described D class audio power amplifier and carry out filtering.
5. according to each described mobile phone speaker circuit in the claim 1～4, it is characterized in that, also comprise:
Magnetic bead, described magnetic bead are connected between described loud speaker and the described D class audio power amplifier.
6. mobile phone speaker circuit according to claim 5 is characterized in that, the resistance of described loud speaker is 3～4 ohm, and supply voltage is 3.6V.
7. mobile phone speaker circuit according to claim 5 is characterized in that, when the frequency of the audio signal of described amplification was 90～120MHz, the resistance of described magnetic bead was 500～700 ohm.
8. mobile phone speaker circuit according to claim 7 is characterized in that, when the frequency of the audio signal of described amplification was 100MHz, the resistance of described magnetic bead was 600 ohm.
9. a portable terminal comprises as each described mobile phone speaker circuit in the claim 1～8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101895640A CN102231770A (en) | 2011-07-07 | 2011-07-07 | Mobile phone loudspeaker circuit and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101895640A CN102231770A (en) | 2011-07-07 | 2011-07-07 | Mobile phone loudspeaker circuit and mobile terminal |
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| CN102231770A true CN102231770A (en) | 2011-11-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2011101895640A Pending CN102231770A (en) | 2011-07-07 | 2011-07-07 | Mobile phone loudspeaker circuit and mobile terminal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102555898A (en) * | 2011-11-30 | 2012-07-11 | 惠州善领科技有限公司 | Vehicle flow velocity measurement early warning instrument |
| CN103812464A (en) * | 2012-11-09 | 2014-05-21 | 国家电网公司 | Filter circuit, telephone audio leading-out device and system |
| CN106792359A (en) * | 2017-01-10 | 2017-05-31 | 惠州Tcl移动通信有限公司 | A kind of electronic equipment and its audio power amplification system |
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| WO2004004409A1 (en) * | 2002-07-01 | 2004-01-08 | Nokia Corporation | Mobile communication terminal |
| CN201061181Y (en) * | 2007-02-13 | 2008-05-14 | 深圳市和而泰电子科技有限公司 | Active speaker |
| CN101465622A (en) * | 2007-12-18 | 2009-06-24 | 北京东微世纪科技有限公司 | D-genus audio power amplifier |
| CN101958959A (en) * | 2009-07-14 | 2011-01-26 | 深圳市福智软件技术有限公司 | Mobile communication device with hearing aid function and method for realizing hearing aid call by using same |
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2011
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2004004409A1 (en) * | 2002-07-01 | 2004-01-08 | Nokia Corporation | Mobile communication terminal |
| CN201061181Y (en) * | 2007-02-13 | 2008-05-14 | 深圳市和而泰电子科技有限公司 | Active speaker |
| CN101465622A (en) * | 2007-12-18 | 2009-06-24 | 北京东微世纪科技有限公司 | D-genus audio power amplifier |
| CN101958959A (en) * | 2009-07-14 | 2011-01-26 | 深圳市福智软件技术有限公司 | Mobile communication device with hearing aid function and method for realizing hearing aid call by using same |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102555898A (en) * | 2011-11-30 | 2012-07-11 | 惠州善领科技有限公司 | Vehicle flow velocity measurement early warning instrument |
| CN103812464A (en) * | 2012-11-09 | 2014-05-21 | 国家电网公司 | Filter circuit, telephone audio leading-out device and system |
| CN106792359A (en) * | 2017-01-10 | 2017-05-31 | 惠州Tcl移动通信有限公司 | A kind of electronic equipment and its audio power amplification system |
| CN106792359B (en) * | 2017-01-10 | 2020-03-06 | 惠州Tcl移动通信有限公司 | Electronic equipment and audio power amplifier system thereof |
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Application publication date: 20111102 |