CN103428592A - Sound amplifying device - Google Patents

Sound amplifying device Download PDF

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Publication number
CN103428592A
CN103428592A CN2012101576584A CN201210157658A CN103428592A CN 103428592 A CN103428592 A CN 103428592A CN 2012101576584 A CN2012101576584 A CN 2012101576584A CN 201210157658 A CN201210157658 A CN 201210157658A CN 103428592 A CN103428592 A CN 103428592A
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CN
China
Prior art keywords
public address
induction coil
audio
address set
loudspeaker
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2012101576584A
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Chinese (zh)
Inventor
张伟斌
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Individual
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Individual
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Publication date
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Priority to CN2012101576584A priority Critical patent/CN103428592A/en
Publication of CN103428592A publication Critical patent/CN103428592A/en
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Abstract

The invention discloses a sound amplifying device. The sound amplifying device comprises an outer shell, an induction coil, a pre-amplification balancer, an audio power amplifier, a loudspeaker and a power module, wherein the induction coil is placed in the outer shell, the pre-amplification balancer is connected with the induction coil, the audio power amplifier is connected with the pre-amplification balancer, and the loudspeaker is connected with the audio power amplifier. The power module supplies electricity to the pre-amplification balancer, the audio power amplifier and the loudspeaker, the induction coil is tightly attached to the inner wall of the outer shell and used for sensing audio electromagnetic signals from the outside, and the loudspeaker is arranged at the opening of the outer shell. Compared with a conventional sound amplifying device connected in a wireless mode, the sound amplifying device has the advantages of being low in power consumption, low in cost and easy to operate, and even having no need of manual operation.

Description

Public address set
[technical field]
The present invention relates to audio frequency and amplify, especially relate to a kind of public address set.
[background technology]
Mobile electronic devices such as mobile phone, panel computer, music or media player generally all has built-in loudspeaker, but is limited to the size of mobile electronic device itself, and built-in loudspeaker are usually all smaller, thereby the volume that can export is also less.Therefore mobile electronic device all needs public address set to increase volume output as auxiliary equipment.
Public address set can be connected with mobile electronic device by wired mode, makes the audio signal of mobile electronic device be transferred to public address set by holding wire, by public address set, is amplified and is processed and export.Yet the wired connection mode always can be brought more inconvenience.
Public address set can also be connected with mobile electronic device by wireless mode.The wireless connections mode of standard need to adopt comparatively complicated circuit, and has higher energy loss, and this can increase the cost of public address set.
[summary of the invention]
Based on this, be necessary to provide a kind of low cost and the convenient public address set used, for the mobile electronic device with built-in toy trumpet, use.
A kind of public address set, comprise shell, also comprise the induction coil be placed in described shell, the preposition amplifying equalizer be connected with described induction coil, the audio-frequency power amplifier be connected with described preposition amplifying equalizer, the loudspeaker and the power module that are connected with described audio-frequency power amplifier, described preposition amplifying equalizer, audio-frequency power amplifier and loudspeaker are powered by power module, described induction coil is close to the inwall setting of shell, audio electro-magnetic signal for induction from mobile electronic device, described loudspeaker are located at the opening part of shell.
Preferably, also comprise central processing module, described preposition amplifying equalizer, audio-frequency power amplifier and power module all are connected with described central processing module, and whether described central processing module detects audio electro-magnetic signal according to preposition amplifying equalizer is controlled the audio-frequency power amplifier unlatching or closes.
Preferably, the quantity of described induction coil is more than two and is distributed in the diverse location of described outer casing inner wall.
Preferably, also comprise the multidiameter option switch be connected between induction coil and preposition amplifying equalizer.
Preferably, described multidiameter option switch adopts manually and arranges.
Preferably, described multidiameter option switch is connected with central processing module, by central processing module, is automatically configured.
Preferably, the output of described audio-frequency power amplifier also connects for transmitting the coil of electromagnetic signal.
Preferably, described induction coil is located at the inwall of shell movably.
Preferably, also comprise the sound baffle of being located at described housing exterior.
Preferably, also comprise for eliminating the anti-phase induction coil of environmental noise.
Above-mentioned public address set, owing to only using a small amount of induction coil and basic preposition amplifying equalizer and audio-frequency power amplifier, so cost is lower, and does not have larger energy loss while using.In addition, as long as by close this public address set of mobile electronic device, make the loudspeaker of this electronic equipment near described induction coil, the audio electro-magnetic signal that the loudspeaker of this electronic equipment send is sensed and is amplified, thereby operation is very simple.
[accompanying drawing explanation]
The public address system modular structure figure that Fig. 1 is an embodiment;
The public address system external view of Fig. 2 Fig. 1 embodiment;
The public address system modular structure figure that Fig. 3 is another embodiment;
State diagram when Fig. 4 utilizes the public address set of Fig. 3 embodiment to amplify for (a) and Fig. 4 (b) for panel computer;
Fig. 5 is a plurality of induction coil distribution schematic diagrams in public address set in Fig. 3 embodiment;
The public address system structure chart that Fig. 6 is an embodiment again;
But the public address set modular structure figure that Fig. 7 is cascade;
Fig. 8 is the public address set modular structure figure with anti-phase induction coil of eliminating environmental noise.
[embodiment]
As shown in Figure 1, be the public address system modular structure figure of an embodiment.This system comprises mobile electronic device 1 and public address set 2.Mobile electronic device 1 has built-in loudspeaker 11, for the sound of output mobile electronic equipment 1.Mobile electronic device 1 and public address set 2 are mutually close, when mobile electronic device 1 passes through loudspeaker 11 output sound, near the electromagnetic field that can change it, public address set 2 utilizes induction coil 21 to respond to and receive the electromagnetic field of this variation, through processing such as preposition amplification, filtering, electromagnetic field signal is carried out to the frequency response compensation, carry out afterwards audio frequency and amplify and the sound of mobile electronic device 1 output can be amplified.
Mobile electronic device 1 can be such as mobile phone, audio/video player, handheld device or removable computer etc.Its inside has at least one loudspeaker 11.
In conjunction with Fig. 2, particularly, public address set 2 comprises shell 201, is placed in induction coil 21, preposition amplifying equalizer 22, central processing module 23, audio-frequency power amplifier 24, loudspeaker 25 and power module 26 in described shell.Induction coil 21, preposition amplifying equalizer 22, audio-frequency power amplifier 24 and loudspeaker 25 are electrically connected to successively.Central processing module 23 is connected with audio-frequency power amplifier 24 with preposition amplifying equalizer 22 simultaneously.26 pairs of preposition amplifying equalizers 22 of power module, central processing module 23, audio-frequency power amplifier 24 and loudspeaker 25 power supplies.
When using public address set 2 to amplify the volume of mobile electronic device 1, the loudspeaker position of mobile electronic device 1 and induction coil 21 is close, induction coil 21 and loudspeaker 11 Inside coil couplings, thus induction receives by the electromagnetic field signal produced because of audio signal.Induction coil 21 is preferably the coil of the electromagnetic signal that can receive most of audio frequency.
Preposition amplifying equalizer 22 for the signal that induction coil 21 is obtained amplified, filtering exports to audio-frequency power amplifier 24 after processing.Audio-frequency power amplifier 24 output audio signals are by loudspeaker 25 outputs.The audio electro-magnetic signal that preposition amplifying equalizer 22 obtains from the loudspeaker 11 of mobile electronic device 1 can come from various sound, voice and music etc., can also be the audio signal through compression coding.Preposition amplifying equalizer 22 is preferably DSP(Digital Signal Process, Digital Signal Processing) module, the DSP module has more balanced control, can make whole audio system have more level and smooth frequency response.Because the size of the loudspeaker 11 in mobile electronic device 1 can not be done very greatly, so low frequency signal usually can be by filtering.The DSP module can be regenerated at mobile electronic device 1 place by the low frequency signal of filtering, obtains more complete voice signal.
The audio signal of mobile electronic device 1 can be also that it comprises wider frequency range through the signal of coding, applicable by mobile electronic device 1 transmission through the signal frequency of coding, and the low-frequency component in voice signal is unlikely to by filtering.The preposition amplifying equalizer 22 that is preferably the DSP module will can obtain the original sound signal through the signal decoding of coding.
Central processing module 23 can be used as the power-supply controller of electric of public address set 2, automatically controls audio-frequency power amplifier 24 and starts or close.When mobile electronic device 1 close public address set 2, the induced signal that central processing module 23 receives from preposition amplifying equalizer 22, and this induced signal is analyzed.According to analysis result, central processing module 23 sends corresponding control signal and starts audio-frequency power amplifier 24.When mobile electronic device 1, during away from public address set 2, central processing module 23 knows that preposition amplifying equalizer 22 does not detect electromagnetic signal, sends corresponding control signal and closes audio-frequency power amplifier 24.
Central processing module 23 can also receive from mobile electronic device 1 and audio electro-magnetic signal that carry control command.This control command comprises volume adjusting, balanced control etc.After these control commands, are analyzed central processing module 23 decodings, for preposition amplifying equalizer 22, audio-frequency power amplifier 24 and other modules are controlled and regulated.
As shown in Figure 3, be the public address system modular structure figure of another embodiment.This system on the basis of above-described embodiment, additionally increase a plurality of induction coils 21 and be connected to induction coil 21 and preposition amplifying equalizer 22 between multidiameter option switch 28.
For different mobile electronic device 1, the position of its loudspeaker 11 all can be different, and when placing the posture difference, the relative position of the induction coil 21 of loudspeaker 11 and public address set 2 also can change.In order to reach best amplifying effect, loudspeaker 11 and induction coil 21 must be close to greatest extent.After the position of the induction coil 21 of the loudspeaker 11 of mobile electronic device 1 and public address set 2 is fixing, reach best amplifying effect, must constantly adjust the relative position of mobile electronic device 1 and public address set 2, this is cumbersome to the user.
By increasing extra induction coil 21, and induction coil is distributed in to the diverse location of shell 201, makes mobile electronic device 1 and public address set 2 also can play the effect of preferably amplifying in different relative positions.
As shown in Fig. 4 (a) and Fig. 4 (b), the state diagram while for panel computer, utilizing the public address set of the present embodiment to amplify.Wherein Fig. 4 (a) is the use state diagram of panel computer while vertically placing, and Fig. 4 (b) is the use state diagram of panel computer while laterally placing.
As shown in Figure 5, public address set 2 inside arrange a plurality of induction coils 21, can, so that panel computer can both allow induction coil 21 near the built-in loudspeaker of panel computer when laterally placing and vertically place, therefore good amplifying effect be arranged.
Multidiameter option switch 28, for controlling being connected between each induction coil 21 and preposition amplifying equalizer 22, to select and the hithermost induction coil 21 of loudspeaker 11, and prevents that other induction coils 21 from bringing interference.
Multidiameter option switch 28 can adopt manual setting.For example for each induction coil 21, a switch that is connected to preposition amplifying equalizer 22 is set, the user by Closing Switch successively, induction coil 21 is connected with preposition amplifying equalizer 22 successively and while according to exported sound, judging 21 work of which induction coil amplifying effect best.
Multidiameter option switch 28 can also adopt automatic configuration.Multidiameter option switch 28 is connected with central control module 23, when mobile electronic device 1 is placed near public address set 2, public address set 2 starts automatic layoutprocedure, central processing module 23 is closed one by one is connected to the electronic switch between induction coil 21 and preposition amplifying equalizer 22, and detects the intensity of the received signal of preposition amplifying equalizer 22.After all induction coils 21 are all detected, central processing module 23 can judge which induction coil 21 can receive useful signal, and which induction coil 21 does not receive signal or receives interference signal.The induction coil 21 that central processing module 23 control multidiameter option switchs 28 can receive useful signal keeps being connected completing automatic layoutprocedure with preposition amplifying equalizer 22.Above automatic layoutprocedure is the sequential configuration mode.In addition, also can adopt the parallel model configuration mode, detect by central control module 23 signal that all induction coils 21 receive exactly, then judging which induction coil 21 is really to receive useful audio signal simultaneously, thereby controls multidiameter option switch 28.
Public address set 2 starts automatic layoutprocedure also can be divided into mode manually or automatically.When the user is placed on the position of close public address set 2 by mobile electronic device 1, can manually start automatic layoutprocedure by the user, for example press certain button.Perhaps by central processing module 23 by after signal having been detected, automatically start automatic layoutprocedure.
In yet another embodiment, induction coil 21 can not fixed extremely, but is attached to actively shell 201 inwalls and is controlled movement by the mechanism that is connected to shell 201 outsides.By this mechanism, the user can adjust the position of induction coil 21 with mobile electronic device 1 coupling from different, can strengthen from another point of view the versatility of public address set 2.
As shown in Figure 6, be the public address system structure chart of an embodiment again.This system comprises mobile phone and the public address set 2 of one of mobile electronic device commonly used 1.Public address set 2 increases sound baffle 29 on the basis of previous embodiment.Sound baffle 29 has the reflecting surface of arc, and is positioned at the end away from the loudspeaker 25 of public address set 2, is also usually an end of the corresponding microphone 12 of mobile phone when hand-free call.Open hand-free function and be put into public address set 2 when mobile phone, the loudspeaker 25 of public address set 2 will be play the sound of the mobile phone after amplification, make hand-free call more clear.The voice that user's face sends reflect and converge reinforcement by this sound baffle 29, and the sound of the microphone 12 of mobile phone is enhanced.
Further, as shown in Figure 7, on the basis of above-described embodiment, at the output of audio-frequency power amplifier 25, also connect the coil 31 for the transmitting audio frequency electromagnetic signal.By transmitting coil 31 is set, a plurality of public address sets 2 can cascade up, and form the public address system of a larger power output.
Further, on basis embodiment illustrated in fig. 1, can also increase anti-phase induction coil 41.Anti-phase induction coil 41 is arranged in shell 201 but away from the loudspeaker 11 of mobile electronic device 1.Anti-phase induction coil 41 also is connected with preposition amplifying equalizer 22, and is connected with induction coil 21 formation difference.
Because induction coil 21 also can receive the electromagnetic noise in environment, also can produce the noise in audio frequency range such as power line, transformer, generator or motor etc. near induction coil 21, therefore add anti-phase induction coil 41 to reduce or to eliminate ambient noise.Anti-phase induction coil 41 and induction coil 21 adopts differential modes to be connected, and the ambient noise signal that both receive is identical because of both parallel placements, but anti-phase while merging, so can cancel out each other.And therefore anti-phase induction coil 41 only has induction coil 21 to receive audio signal away from loudspeaker 11, this audio signal can not be cancelled because of the existence of anti-phase induction coil 41.
Above-mentioned public address set is compared with the public address set that traditional wireless mode is connected, and has that power consumption is little, cost is low and simple to operate even without manually-operated advantage.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.

Claims (10)

1. a public address set, comprise shell, it is characterized in that, also comprise the induction coil be placed in described shell, the preposition amplifying equalizer be connected with described induction coil, the audio-frequency power amplifier be connected with described preposition amplifying equalizer, the loudspeaker and the power module that with described audio-frequency power amplifier, are connected, described preposition amplifying equalizer, audio-frequency power amplifier and loudspeaker are powered by power module, described induction coil is close to the inwall setting of shell, the audio electro-magnetic signal of sending from the loudspeaker of external electronic device for induction, described loudspeaker are located at the opening part of shell.
2. public address set as claimed in claim 1, it is characterized in that, also comprise central processing module, described preposition amplifying equalizer, audio-frequency power amplifier and power module all are connected with described central processing module, and whether described central processing module detects audio electro-magnetic signal according to preposition amplifying equalizer is controlled the unlatching of audio-frequency power amplifier or closes.
3. public address set as claimed in claim 2, is characterized in that, the quantity of described induction coil is two or more and is distributed in the diverse location of described outer casing inner wall.
4. public address set as claimed in claim 3, is characterized in that, also comprises the multidiameter option switch be connected between induction coil and preposition amplifying equalizer.
5. public address set as claimed in claim 4, is characterized in that, described multidiameter option switch adopts manually and arranges.
6. public address set as claimed in claim 4, is characterized in that, described multidiameter option switch is connected with central processing module, by central processing module, is automatically configured.
7. public address set as claimed in claim 1, is characterized in that, the output of described audio-frequency power amplifier also connects the coil for transmission of electromagnetic signals.
8. public address set as claimed in claim 1, is characterized in that, described induction coil is located at the inwall of shell movably.
9. public address set as claimed in claim 1, is characterized in that, also comprise be located at described housing exterior for converging the sound baffle of user speech to the microphone of external electronic device.
10. public address set as claimed in claim 1, is characterized in that, also comprises for eliminating the anti-phase induction coil of environmental noise.
CN2012101576584A 2012-05-21 2012-05-21 Sound amplifying device Pending CN103428592A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105282646A (en) * 2014-07-15 2016-01-27 纬创资通股份有限公司 System and related device for augmenting multimedia playback on mobile device
CN107727221A (en) * 2016-08-12 2018-02-23 胡海宁 A kind of removable interchangeable megaphone scale
CN113345438A (en) * 2021-05-28 2021-09-03 深圳大学 Monitoring method and system based on loudspeaker magnetic field

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Publication number Priority date Publication date Assignee Title
CN2096168U (en) * 1991-01-24 1992-02-12 南京大学 Radio receiver for tv sound
CN2686267Y (en) * 2004-01-19 2005-03-16 冯丽燕 Radio microphone language learning machine
CN201409161Y (en) * 2009-05-08 2010-02-17 周景华 Separate passive electromagnetic coupling intercom communication device capable of penetrating metal silo wall
US20100081379A1 (en) * 2008-08-20 2010-04-01 Intel Corporation Wirelessly powered speaker
CN101770686A (en) * 2009-01-07 2010-07-07 三星电子株式会社 Audio device, AV system having the audio device, and method to control the audio device
CN201667638U (en) * 2010-03-31 2010-12-08 比亚迪股份有限公司 Audio combined playing device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2096168U (en) * 1991-01-24 1992-02-12 南京大学 Radio receiver for tv sound
CN2686267Y (en) * 2004-01-19 2005-03-16 冯丽燕 Radio microphone language learning machine
US20100081379A1 (en) * 2008-08-20 2010-04-01 Intel Corporation Wirelessly powered speaker
CN101770686A (en) * 2009-01-07 2010-07-07 三星电子株式会社 Audio device, AV system having the audio device, and method to control the audio device
CN201409161Y (en) * 2009-05-08 2010-02-17 周景华 Separate passive electromagnetic coupling intercom communication device capable of penetrating metal silo wall
CN201667638U (en) * 2010-03-31 2010-12-08 比亚迪股份有限公司 Audio combined playing device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105282646A (en) * 2014-07-15 2016-01-27 纬创资通股份有限公司 System and related device for augmenting multimedia playback on mobile device
CN105282646B (en) * 2014-07-15 2019-01-18 纬创资通股份有限公司 To enhance the system and relevant device of the multimedia in mobile device
CN107727221A (en) * 2016-08-12 2018-02-23 胡海宁 A kind of removable interchangeable megaphone scale
CN113345438A (en) * 2021-05-28 2021-09-03 深圳大学 Monitoring method and system based on loudspeaker magnetic field

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Application publication date: 20131204