CN101820563B - Speaker protection system - Google Patents
Speaker protection system Download PDFInfo
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- CN101820563B CN101820563B CN201010144848.3A CN201010144848A CN101820563B CN 101820563 B CN101820563 B CN 101820563B CN 201010144848 A CN201010144848 A CN 201010144848A CN 101820563 B CN101820563 B CN 101820563B
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Abstract
The invention provides a speaker protection system which comprises a digital signal processing module, a digital/analog conversion module and a power amplification module, wherein power detection is carried out on digital signals processed by the digital signal processing module, attenuation values and amplification values are calculated based on the detected power, then the digital/analog conversion module and the corresponding attenuation or amplification treatment is carried out on the digital signals based on the calculated attenuation values or amplification values by the power amplification module to enable the input power of the digital signals to be within the defined dynamic range of speaker input signals, and then, the processed digital signals are input to the speaker. The speaker protection system has the advantages of protecting the speaker from audio frequency impairment and enhancing the acoustic quality.
Description
Technical field
The present invention relates to a kind of system, relate in particular to a kind of loudspeaker protection system.
Background technology
Along with scientific and technical development, the technology content of audio frequency amplifier self design and user's requirement are more and more higher, especially to the sound performance of loud speaker, require more and more higher.
For loud speaker, having an index is maximal input Pmax, and when the signal power of input is greater than this value, loud speaker may damage.And, may bottoming due to the voice coil loudspeaker voice coil of loud speaker now, power amplifier module produces slicing, thereby destroys tonequality.
So, when input signal exceeds the maximal input of loud speaker, how to protect loud speaker to become a research project.
Summary of the invention
For the problem that existing loud speaker may be damaged by audio frequency input and tonequality reduces, the invention provides a kind of loudspeaker protection system of protecting loud speaker not to be subject to audio frequency damage, enhancing tonequality.
A kind of loudspeaker protection system, comprise digital signal processing module, numeral/analog conversion module and power amplifier module, digital signal is processed through digital signal processing module, carry out power detection, and calculate pad value or value of magnification according to the power meter detecting, then numeral/analog conversion module and power amplifier module carry out correspondence decay or amplify and process digital signal according to the pad value calculating or value of magnification, make the input power of digital signal in the dynamic range of defined loud speaker input signal, again by the digital signal input loudspeaker after processing, defined dynamic range is P1min to P1max, wherein, P1min is that input signal is white noise, the corresponding input signal power of sound pressure level that people's ear is listened more comfortablely, P1min is greater than the lower limit input power P0min of loud speaker, when P1max is the frequency of the input signal simple signal that is the resonance frequency of loudspeaker, record loud speaker total harmonic distortion time, the corresponding power of input signal now, P1max is less than the upper limit input power P0max of loud speaker, when the power of input signal is less than P1min, input signal is amplified in defined dynamic range, when the power of input signal is greater than P1max, by attenuated input signal in defined dynamic range.
Preferably, digital signal processing module is processed when the digital signal of input is carried out to power detection, its calculating be the average power of input signal.
Preferably, after collecting the signal that n orders, ask the signal power sum Pn of n point, at next moment t, gather the data of some input signals, ask the power P t of this point, then deduct the data power P1 of the input signal of n the starting point of putting, add t performance number Pt constantly, then divided by n, try to achieve average power Pa.
Loudspeaker protection system of the present invention has redefined the dynamic range of input signal according to the characteristic of loud speaker, for loud speaker arranges best dynamic, protection loud speaker is not subject to the impact of high-power input signal.And, because loud speaker carries out work in the situation that distortion is less, guaranteed that tonequality is in preferable states, so loudspeaker protection system of the present invention also has the effect of improving tonequality.Therefore loudspeaker protection system of the present invention has protection loud speaker and is not subject to audio frequency damage, strengthens the advantages such as tonequality.
Accompanying drawing explanation
Fig. 1 is the system framework figure of loudspeaker protection system of the present invention.
Fig. 2 is the principle schematic of loudspeaker protection system shown in Fig. 1.
Fig. 3 is the signal treatment step of loudspeaker protection system shown in Fig. 1.
Fig. 4 is the average power calculating method in the treatment step of signal shown in Fig. 3.
Fig. 5 is the calculated examples figure of loudspeaker protection system shown in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, loudspeaker protection system structure of the present invention is described.
Refer to Fig. 1 to Fig. 3, wherein Fig. 1 is the system framework figure of loudspeaker protection system of the present invention, and Fig. 2 is the principle schematic of loudspeaker protection system shown in Fig. 1, and Fig. 3 is the signal treatment step of loudspeaker protection system shown in Fig. 1.
Native system is based on digital signal processing platform, and it comprises digital signal processing module, numeral/analog conversion module (Digital to Analog Converter, DAC) and power amplifier module.In loudspeaker protection system of the present invention, after digital signal input, first through digital signal processing module, process, then pass through DAC and power amplifier module, signal is amplified, then be input to loud speaker.
In Fig. 2, P0min is the lower limit input power of loud speaker, generally speaking, and P0min=0w; P0max is the upper limit input power that loud speaker can bear, corresponding input power when limiting value Xmax appears in the namely voice coil loudspeaker voice coil of loud speaker vibration.Conventionally, in order to protect loud speaker injury-free, its input signal is controlled to P0max below.
The present invention has carried out new definition to the dynamic range of loud speaker input signal:
(a), the lower limit of dynamic range refers to that input signal is white noise, when sound pressure level that people's ear is listened more comfortablely, the power P 1min of input signal now;
(b), the upper limit of dynamic range is while referring to the simple signal that the frequency of input signal is the resonance frequency of loudspeaker, the loud speaker total harmonic distortion recording when certain limit value, the power P 1max of input signal now; Wherein, the value range of loud speaker total harmonic distortion need to record in advance according to the size of loud speaker and pure tone test.
Therefore; the dynamic range of loud speaker input signal is from P0min to P0max; be compressed to P1min to P1max; the principle of loudspeaker protection system of the present invention is: if the power of input signal is below P1min; this signal is amplified in new dynamic range; if the power of input signal more than P1max, by this signal attenuation in new dynamic range.
In signal treatment step, first calculate the average power that input signal n is ordered, then obtain pad value or value of magnification, and then according to pad value or value of magnification, signal is carried out corresponding decay or amplifies rear output.Wherein, as shown in Figure 4, for the calculating of power, adopted average power, that is to say, by place constantly the value of sampled point be averaging power with n the value of putting before.Suppose now to have collected the signal that n is ordered, try to achieve the signal power sum Pn of n point, when gather the data of some input signals at next moment t, ask the power P t of this point.Now, first deduct the data power P1 of the input signal of n the starting point of putting, add t performance number Pt constantly, then divided by n, be averaging power P a.According to the average power Pa now trying to achieve, signal is decayed or amplified.When next sampled point, continue to be averaging power according to above method.
Illustrate, refer to Fig. 5, the noise gate of establishing whole system is-40dB, and the maximum gain Gmax that establishes DAC and power amplifier module is 3.3Vrms, keeps this yield value constant, and this value is set to 0dB.Now, the scope of the input signal of loud speaker is-40dB to 0dB.
Record in advance the value range of certain loud speaker total harmonic distortion, new definition according to the present invention to loud speaker input reference signal, the input signal amplitude range of this loud speaker is Vmin=0.115Vrms, Vmax=1.414Vrms, corresponding performance number is-29.2dB respectively,-7.3dB, be now compressed into-29.2dB of the scope of the input signal of this loud speaker to-7.3dB.
Curve A and curve B represent respectively the signal power variations of following while processing input signal.Wherein, than-signal that 40dB is little, think noise signal, do not deal with; Be greater than-40dB is less than the signal of 0dB, follows curve A or curve B, by its decay or amplification, to-29.2dB and-7.3dB between, wherein, in Fig. 3 in L point left side for amplifying, on L point right side, be to decay.
In upper example, digital signal amplitude is between 0 to 1.Because the yield value of system hardware has been made as 0dB, so, now only need to calculate the power of digital signal, obtain performance number Pin, corresponding power calculation curve A or curve B, then carry out signal processing, obtains performance number Pout.
At loudspeaker protection system of the present invention, there is following characteristics:
First, redefined the dynamic range of input signal according to the characteristic of each loud speaker, for each loud speaker arranges best dynamic, protection loud speaker is not subject to the impact of high-power input signal;
Secondly, because loud speaker carries out work in the situation that distortion is less, guaranteed that tonequality is in preferable states, so loudspeaker protection system of the present invention also has the effect of improving tonequality.
Then, under same volume arranges, without user, regulate, can automatically make low-power level signal sound more clear, make high-power signal sound not ear-piercing.For example: when there being one section of voice; first half section very faint (power is in L point left side); second half section very ear-piercing (power is on L point right side); loudspeaker protection system of the present invention can calculate the power of signal automatically; making corresponding signal processes; faint sound is amplified, can make ear-piercing sound attenuating again.
Also have, owing to adopting the method for average power, make when sign mutation, the yield value calculating or pad value change relatively mild, and signal changes more level and smooth, the distortion having brought when having reduced signal attenuation or having increased.
In sum, loudspeaker protection system of the present invention has protection loud speaker and is not subject to audio frequency damage, strengthens the advantages such as tonequality.
These are only preferred case study on implementation of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. a loudspeaker protection system, comprise digital signal processing module, numeral/analog conversion module and power amplifier module, be characterised in that: digital signal is processed through digital signal processing module, carry out power detection, and calculate pad value or value of magnification according to the power meter detecting, then numeral/analog conversion module and power amplifier module carry out correspondence decay or amplify and process digital signal according to the pad value calculating or value of magnification, make the input power of digital signal in the dynamic range of defined loud speaker input signal, again by the digital signal input loudspeaker after processing, defined dynamic range is P1min to P1max, wherein, P1min is that input signal is white noise, the corresponding input signal power of sound pressure level that people's ear is listened more comfortablely, P1min is greater than the lower limit input power P0min of loud speaker, when P1max is the frequency of the input signal simple signal that is the resonance frequency of loudspeaker, record loud speaker total harmonic distortion time, the corresponding power of input signal now, P1max is less than the upper limit input power P0max of loud speaker, when the power of input signal is less than P1min, input signal is amplified in defined dynamic range, when the power of input signal is greater than P1max, by attenuated input signal in defined dynamic range.
2. loudspeaker protection system according to claim 1, is characterized in that: it is when the digital signal of input is carried out to power detection that digital signal processing module is processed, its calculating be the average power of input signal.
3. loudspeaker protection system according to claim 2; it is characterized in that: after collecting the signal that n orders; ask the signal power sum Pn of n point; at next moment t, gather the data of some input signals; ask the power P t of this point; then deduct the data power P1 of the input signal of n the starting point of putting, add t performance number Pt constantly, then divided by n, try to achieve average power Pa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010144848.3A CN101820563B (en) | 2010-04-06 | 2010-04-06 | Speaker protection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010144848.3A CN101820563B (en) | 2010-04-06 | 2010-04-06 | Speaker protection system |
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| CN101820563A CN101820563A (en) | 2010-09-01 |
| CN101820563B true CN101820563B (en) | 2014-01-29 |
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| CN201010144848.3A Expired - Fee Related CN101820563B (en) | 2010-04-06 | 2010-04-06 | Speaker protection system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103023438B (en) * | 2012-11-30 | 2016-02-24 | 青岛歌尔声学科技有限公司 | A kind of audio distortion adjustment control equipment and audio distortion method of adjustment |
| CN108307228B (en) * | 2018-02-05 | 2020-01-24 | 深圳创维－Rgb电子有限公司 | Sound effect adjusting method and device, television and storage medium |
| CN111741410B (en) * | 2020-06-15 | 2021-08-20 | 中科上声（苏州）电子有限公司 | Configuration method and device of dynamic range compressor in loudspeaker equalization |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1239860A (en) * | 1999-05-05 | 1999-12-29 | 刘达强 | Constant power driving method for loudspeaker |
| CN200966147Y (en) * | 2006-08-01 | 2007-10-24 | 朱铭锆 | Voice power amplifier |
| CN201178491Y (en) * | 2008-03-18 | 2009-01-07 | 桦勋有限公司 | Micro loudspeaker apparatus integrating filter circuit and power regulation circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7574010B2 (en) * | 2004-05-28 | 2009-08-11 | Research In Motion Limited | System and method for adjusting an audio signal |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1239860A (en) * | 1999-05-05 | 1999-12-29 | 刘达强 | Constant power driving method for loudspeaker |
| CN200966147Y (en) * | 2006-08-01 | 2007-10-24 | 朱铭锆 | Voice power amplifier |
| CN201178491Y (en) * | 2008-03-18 | 2009-01-07 | 桦勋有限公司 | Micro loudspeaker apparatus integrating filter circuit and power regulation circuit |
Non-Patent Citations (2)
| Title |
|---|
| 一种多功能电力监控装置的研究;孟昭勇等;《继电器》;19980630;第26卷(第3期);第28页 * |
| 孟昭勇等.一种多功能电力监控装置的研究.《继电器》.1998,第26卷(第3期),第28页. |
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