CN106101932A - A kind of loudspeaker audio drive circuit, method and intelligent terminal - Google Patents
A kind of loudspeaker audio drive circuit, method and intelligent terminal Download PDFInfo
- Publication number
- CN106101932A CN106101932A CN201610541331.5A CN201610541331A CN106101932A CN 106101932 A CN106101932 A CN 106101932A CN 201610541331 A CN201610541331 A CN 201610541331A CN 106101932 A CN106101932 A CN 106101932A
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- speaker
- driving signal
- vibrating elements
- power amplifier
- drive
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of loudspeaker audio driving method, be applied to include the drive circuit of power amplifier, including: detect the former driving signal of described power amplifier output；The vibration information control described power amplifier output under the driving of described former driving signal of the vibrating elements according to described former driving signal and speaker is new drives signal to drive speaker make the amplitude symmetry of vibrating elements and arrive preset value.The invention also discloses circuit and the intelligent terminal of correspondence.The present invention drives signal by real time detection and analyzes the vibrating elements of the speaker Vibration Condition under the driving driving signal in advance and control to drive the vibrating elements of speaker, the amplitude preservation making vibrating elements is constant, solves and causes the abnormal problem such as audio distortions, noise because voice coil loudspeaker voice coil is in unbalanced state.
Description
Technical field
The present invention relates to electroacoustics technical field, more particularly, it relates to a kind of loudspeaker audio drive circuit, method and
Intelligent terminal.
Background technology
In existing intelligent terminal, speaker the most all adventitious sound chambeies, and sound chamber is designed to rear sound chamber hermetic type, mesh
Be to avoid loudspeaker sound volume to diminish, and promote the reliability of its work.
In the ideal situation, speaker is in sound chamber during uniform force, and voice coil loudspeaker voice coil is in balancing work state, now, raises one's voice
Device work time, voice coil loudspeaker voice coil up and down reciprocatingly vibrates, and will not offset towards left and right, if speaker in sound chamber by force unbalance, then can lead
Cause to offset about voice coil loudspeaker voice coil, and then affect the vibrating elements of speaker, thus produce the abnormal problem such as distortion, noise.
It can thus be seen that owing to the design of the speaker cavity of intelligent terminal is limited by complete machine structure space,
During speaker operation, voice coil loudspeaker voice coil is easily in unbalanced state, the problem producing cacophonia.
For the problems referred to above, in addition to the structure of Intelligent Optimal terminal designs, the most more preferable solution
Summary of the invention
The technical problem to be solved in the present invention is, in intelligent terminal in prior art during speaker operation by structure
The restriction in space and occur that voice coil loudspeaker voice coil is in unbalanced state, and then cause the abnormal problem such as audio distortions, noise, it is provided that Yi Zhongyang
Sound device audio drive circuitry, method and intelligent terminal.
The present invention solves the problems referred to above and be employed technical scheme comprise that and provide a kind of loudspeaker audio driving method, application
In including the drive circuit of power amplifier, including:
Detect the former driving signal of described power amplifier output；
The vibration under the driving of described former driving signal of the vibrating elements according to described former driving signal and speaker
Information control described power amplifier output is new drives signal to drive speaker make the amplitude symmetry of vibrating elements and arrive pre-
If value.
Wherein, also include:
The vibrating elements of preanalysis speaker under the driving of described former driving signal the Vibration Condition of vibrating elements to obtain
Obtain vibrating elements vibration information under the driving of described former driving signal, and described vibration information includes amplitude data.
Wherein, the described vibrating elements according to described former driving signal and speaker is in the driving of described former driving signal
Under vibration information control that the output of described power amplifier is new drives signal to drive speaker to make the amplitude of vibrating elements symmetrical
And the step arriving preset value includes:
The vibrating elements according to described former driving signal and speaker vibration letter under the driving of described former driving signal
Breath output DC offset voltage, and the vibration correction direction phase of the polarity of described DC offset voltage and the vibrating elements of speaker
With；
Described DC offset voltage is added to described power amplifier input so that described power amplifier output
Newly drive signal, and described new driving signal is identical with the frequency of described former driving signal, and then drive speaker to make vibration unit
The amplitude of part is symmetrical and arrives preset value.
For solving the problems referred to above, another technical scheme of the present invention there is provided a kind of loudspeaker audio and drives electricity
Road, including digital to analog converter and power amplifier, also includes detection module and negative feedback module, described detection module and described merit
The outfan of rate amplifier connects, and the input of described negative feedback module is connected with described detection module, outfan and described merit
The input of rate amplifier connects；
When described detection module detects the former driving signal that described power amplifier exports, described negative feedback module root
Institute is controlled according to the vibrating elements of described former driving signal and the speaker vibration information under the driving of described former driving signal
State power amplifier output new driving signal to drive speaker make the amplitude symmetry of vibrating elements and arrive preset value.
Wherein, the vibrating elements of described speaker vibration information under the driving of described former driving signal is by preanalysis
The Vibration Condition of the vibrating elements of speaker vibrating elements under the driving of described former driving signal and obtain.
Wherein, described negative feedback module drives letter according to the vibrating elements of described former driving signal and speaker described
Number the lower vibration information that drives control the output of described power amplifier to drive speaker to make the amplitude of vibrating elements arrive in advance
If value includes:
Described negative feedback module is believed described former driving according to the vibrating elements of described former driving signal and described speaker
Number drive lower vibration information output DC offset voltage, and the polarity of described DC offset voltage is first with the vibration of speaker
It is identical that direction is corrected in the vibration of part；
Described DC offset voltage is added to described power amplifier input so that described power amplifier output
Newly drive signal, and described new driving signal is identical with the frequency of described former driving signal, and then drive speaker to make vibration unit
The amplitude of part is symmetrical and arrives preset value.
For solving the problems referred to above, another technical scheme of the present invention there is provided a kind of intelligent terminal, including raising
Sound device and above-mentioned loudspeaker audio drive circuit, described loudspeaker audio drive circuit is connected with described speaker.
Beneficial effects of the present invention has: the present invention drives signal by detection in real time and analyzes the vibration of speaker in advance
Element Vibration Condition under the driving driving signal controls to drive the vibrating elements of speaker, makes the amplitude of vibrating elements protect
Hold constant, solve to cause because voice coil loudspeaker voice coil is in unbalanced state the abnormal problem such as audio distortions, noise.
Accompanying drawing explanation
Below in conjunction with drawings and the embodiments, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of the loudspeaker audio drive circuit embodiment of the present invention；
The schematic diagram of its diaphragm Vibration Condition in intelligent terminal when Fig. 2 is certain speaker operation；
Fig. 3 is the flow chart of the loudspeaker audio driving method embodiment of the present invention；
Fig. 4 is the structural representation of intelligent terminal's embodiment of the present invention.
Detailed description of the invention
Should be appreciated that detailed description of the invention described herein, only in order to explain the present invention, is not intended to limit the present invention.
As it is shown in figure 1, the structural representation of the loudspeaker audio drive circuit embodiment of the present invention, this circuit 100 wraps
Include digital to analog converter 110, power amplifier 120, detection module 130 and negative feedback module 140.The input of digital to analog converter 110
Audio digital signals after end input processing, the audio digital signals after this process is by player plays audio file, through number
Word gains etc. process and obtain.The outfan of digital to analog converter 110 is connected with the input of power amplifier 120, and power is put
The outfan of big device 120 is connected with speaker (not shown).Audio digital signals after process is through digital to analog converter 110 and merit
Rate amplifier 120 exports a driving signal, acts on the voice coil loudspeaker voice coil of speaker, and then the vibrating elements of driving speaker, with by sound
Frequently signal spreads out.In embodiments of the present invention, vibrating elements can be diaphragm.
Detection module 130 is connected with the outfan of power amplifier 120, the input of negative feedback module 140 and detection mould
Block 130 connects, outfan is connected with the input of power amplifier 120, and detection module 130 is used for detecting power amplifier 120
The driving signal of output, negative feedback module 140 is for the former driving signal detected according to detection module 130 and speaker
Vibrating elements vibration information under the driving of this former driving signal controls power amplifier output new driving signal and shakes to drive
The amplitude of dynamic element is symmetrical and arrives preset value.In embodiments of the present invention, detection module 130 can use testing circuit
Realizing, negative feedback module 140 can use digital circuit, analog circuit or both hybrid modes to realize.
Wherein, in embodiments of the present invention, the vibrating elements of speaker vibration under the driving of former driving signal
Information is that the Vibration Condition of vibrating elements under the driving of this former driving signal of the vibrating elements by preanalysis speaker obtains
's.Specifically, first it is modeled analyzing to speaker Vibration Condition to vibrating elements in intelligent terminal, secondly obtains and exist
The different vibration informations driving lower vibrating elements driving signal, wherein, vibration information includes amplitude data.As in figure 2 it is shown,
Its diaphragm Vibration Condition in intelligent terminal when being certain speaker operation obtained after preanalysis, wherein transverse axis represents driving
The frequency of signal, the longitudinal axis represents the amplitude data of diaphragm, and in perfect condition, the amplitude of diaphragm is symmetrical and straight, such as figure
In straight line a and b shown in, straight line c represents zero point, and as seen from the figure, during this speaker operation, the amplitude of its diaphragm is asymmetric and non-
Straight, illustrate that the voice coil loudspeaker voice coil of speaker is in unbalanced state, be easily generated the abnormal problem such as distortion, noise.
Control negative feedback module below drive the vibrating elements of speaker to make its amplitude symmetrical and reach the work of predetermined value
It is described in detail as principle:
Former driving signal that negative feedback module 140 detects according to detection module 130 and vibrating elements are in this former driving
Vibration information output DC offset voltage under the driving of signal, the polarity of DC offset voltage and the vibrating elements of speaker
It is identical that direction is corrected in vibration, illustrates, as in figure 2 it is shown, under the driving driving signal that frequency is 1400Hz, vibrating elements
The point of symmetry of amplitude below zero point, then the vibration of vibrating elements corrects direction upwards, is just labeled as, now, direct current biasing
The polarity of voltage is just then, and certainly, under the driving driving signal of other frequencies, the point of symmetry of the amplitude of vibrating elements are in zero point
Above, now, the polarity of DC offset voltage is then negative.
After negative feedback module 140 exports DC offset voltage, be added to power amplifier 120 by this DC offset voltage
Input, now, power amplifier output newly drives signal, and then this new driving signal drives speaker, makes vibrating elements
Amplitude is symmetrical and arrives preset value, and wherein, the frequency of new driving signal is identical with the frequency of former driving vibration signal.Illustrate
Bright, as in figure 2 it is shown, this preset value can amplitude represented by straight line a or b, under certain drives signal, through negative feedback mould
The DC offset voltage of block output, the amplitude of vibrating elements is symmetrical and reaches preset value, and then, under different driving signals,
By the DC offset voltage exported according to driving signal and the Vibration Condition of vibrating elements so that vibrating elements is different
Drive its amplitude under signal symmetrical and to be this preset value, i.e. amplitude symmetrical and do not change with the frequency change driving signal.
Owing to DC offset voltage is that then DC offset voltage is real according to driving signal and the Vibration Condition of vibrating elements to export
Time and change, rather than definite value.
As it is shown on figure 3, be the flow chart of the loudspeaker audio driving method embodiment of the present invention, the method is applied to
State in loudspeaker audio drive circuit, comprise the following steps:
Step S302: the former driving signal of the output of detection power amplifier；
Step S304: according to vibrating elements the shaking under the driving of this former driving signal of former driving signal and speaker
Dynamic information control power amplifier output newly drives signal to drive speaker make the amplitude symmetry of vibrating elements and arrive default
Value.
Specifically, in embodiments of the present invention, step S304 includes: according to former driving signal and the vibration of speaker
Element under the driving of former driving signal vibration information output DC offset voltage, and the polarity of DC offset voltage with raise one's voice
It is identical that direction is corrected in the vibration of the vibrating elements of device；DC offset voltage is added to the input of power amplifier so that power
Amplifier output newly drives signal, and new driving signal is identical with the frequency of described former driving signal, and then drives speaker to make
The amplitude of vibrating elements is symmetrical and arrives preset value.
In embodiments of the present invention, due to the vibration under the driving of this former driving signal of the vibrating elements of speaker
Information is that the Vibration Condition of vibrating elements under the driving of this former driving signal of the vibrating elements by preanalysis speaker obtains
, the method also includes:
Step S300: the vibrating elements of preanalysis speaker is the vibration feelings of vibrating elements under the driving of this former driving signal
Condition is to obtain the vibrating elements vibration information under the driving of this former driving signal of speaker.
Wherein, vibration information includes amplitude data.
As shown in Figure 4, being the structural representation of the embodiment of the intelligent terminal of the present invention, this intelligent terminal 10 includes raising
Sound device 200 and above-mentioned loudspeaker audio drive circuit 100, wherein, above-mentioned loudspeaker audio drive circuit 100 and speaker
200 connect.
Summarizing, the present invention drives signal by detection in real time and analyzes the vibrating elements of speaker in advance at driving signal
The lower Vibration Condition that drives control to drive the vibrating elements of speaker, the amplitude preservation making vibrating elements is constant, solution because of
Voice coil loudspeaker voice coil is in unbalanced state and causes the abnormal problem such as audio distortions, noise.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope that the invention discloses, the change that can readily occur in or replacement,
All should contain within protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is as the criterion.
Claims (7)
1. a loudspeaker audio driving method, is applied to include the drive circuit of power amplifier, it is characterised in that including:
Detect the former driving signal of described power amplifier output；
The vibrating elements according to described former driving signal and speaker vibration information under the driving of described former driving signal
Control described power amplifier output new driving signal to drive speaker make the amplitude symmetry of vibrating elements and arrive preset value.
2. according to the method described in claim 1, it is characterised in that also include:
The vibrating elements of preanalysis speaker Vibration Condition of vibrating elements under the driving of described former driving signal shakes to obtain
Move element vibration information under the driving of described former driving signal, and described vibration information includes amplitude data.
3. according to the method described in claim 1, it is characterised in that described according to described former driving signal and speaker
Vibrating elements vibration information under the driving of described former driving signal control the output of described power amplifier new drive signal with
Speaker is driven to make symmetrical and arrival preset value the step of amplitude of vibrating elements include:
The vibrating elements according to described former driving signal and speaker vibration information under the driving of described former driving signal is defeated
Go out DC offset voltage, and the polarity of described DC offset voltage is identical with the vibration of the vibrating elements of speaker correction direction；
Described DC offset voltage is added to described power amplifier input so that described power amplifier output newly drive
Dynamic signal, and described new driving signal is identical with the frequency of described former driving signal, and then drive speaker to make vibrating elements
Amplitude is symmetrical and arrives preset value.
4. a loudspeaker audio drive circuit, including digital to analog converter and power amplifier, it is characterised in that also include detection
Module and negative feedback module, described detection module is connected with the outfan of described power amplifier, described negative feedback module defeated
Enter end be connected with described detection module, outfan is connected with the input of described power amplifier；
When described detection module detects the former driving signal that described power amplifier exports, described negative feedback module is according to institute
State the vibrating elements of former driving signal and the speaker vibration information under the driving of described former driving signal and control described merit
Rate amplifier output is new drives signal to drive speaker make the amplitude symmetry of vibrating elements and arrive preset value.
5. according to the circuit described in claim 4, it is characterised in that the vibrating elements of described speaker is believed described former driving
Number drive under vibration information be that the vibrating elements by preanalysis speaker vibrates unit under the driving of described former driving signal
The Vibration Condition of part and obtain.
6. according to the circuit described in claim 4, it is characterised in that described negative feedback module according to described former driving signal with
And the vibration information that the vibrating elements of speaker is under the driving of described driving signal controls described power amplifier and exports to drive
Dynamic speaker makes the amplitude arrival preset value of vibrating elements include:
Described negative feedback module according to the vibrating elements of described former driving signal and described speaker at described former driving signal
Vibration information output DC offset voltage under Qu Donging, and the vibrating elements of the polarity of described DC offset voltage and speaker
It is identical that direction is corrected in vibration；
Described DC offset voltage is added to described power amplifier input so that described power amplifier output newly drive
Dynamic signal, and described new driving signal is identical with the frequency of described former driving signal, and then drive speaker to make vibrating elements
Amplitude is symmetrical and arrives preset value.
7. an intelligent terminal, it is characterised in that include speaker and the speaker as according to any one of claim 4-6
Audio drive circuitry, described loudspeaker audio drive circuit is connected with described speaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610541331.5A CN106101932A (en) | 2016-07-11 | 2016-07-11 | A kind of loudspeaker audio drive circuit, method and intelligent terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610541331.5A CN106101932A (en) | 2016-07-11 | 2016-07-11 | A kind of loudspeaker audio drive circuit, method and intelligent terminal |
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| CN106101932A true CN106101932A (en) | 2016-11-09 |
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| CN201610541331.5A Pending CN106101932A (en) | 2016-07-11 | 2016-07-11 | A kind of loudspeaker audio drive circuit, method and intelligent terminal |
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Cited By (7)
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| CN107690109A (en) * | 2017-09-01 | 2018-02-13 | 广州时艺音响科技有限公司 | Hyperthread transmitting device |
| CN108430004A (en) * | 2018-04-16 | 2018-08-21 | 维沃移动通信有限公司 | A kind of loud speaker amplitude regulating device, adjusting method and mobile terminal |
| CN108882129A (en) * | 2018-09-21 | 2018-11-23 | 歌尔股份有限公司 | Circuit board, loudspeaker, electronic equipment and polarization compensation method |
| CN109270352A (en) * | 2018-08-23 | 2019-01-25 | 维沃移动通信有限公司 | A kind of amplitude adjusting method and sounding device |
| CN111432312A (en) * | 2019-01-09 | 2020-07-17 | 台湾立讯精密有限公司 | Thin speaker device |
| US10827277B2 (en) | 2019-01-09 | 2020-11-03 | Luxshare-Ict Co., Ltd. | Thin loudspeaker device |
| CN113556647A (en) * | 2020-04-23 | 2021-10-26 | 华为技术有限公司 | Loudspeaker device and method for reducing shell vibration thereof |
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| CN113556647B (en) * | 2020-04-23 | 2022-11-22 | 华为技术有限公司 | Loudspeaker device and method for reducing shell vibration thereof |
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Application publication date: 20161109 |