CN101820563A - Speaker protection system - Google Patents
Speaker protection system Download PDFInfo
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- CN101820563A CN101820563A CN201010144848A CN201010144848A CN101820563A CN 101820563 A CN101820563 A CN 101820563A CN 201010144848 A CN201010144848 A CN 201010144848A CN 201010144848 A CN201010144848 A CN 201010144848A CN 101820563 A CN101820563 A CN 101820563A
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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 the continuous development of science and technology, the technology content of audio frequency amplifier self design and user's requirement are more and more higher, and especially the sound performance to loud speaker requires more and more higher.
For loud speaker, it is maximal input Pmax that an index is arranged, and when the signal power of input was worth greater than this, loud speaker may damage.And because the voice coil loudspeaker voice coil of loud speaker may feel secure at this moment, 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
At the problem that existing loud speaker may be damaged by the audio frequency input and tonequality reduces, the invention provides a kind of loud speaker of protecting and be not subjected to audio frequency to damage, strengthen the loudspeaker protection system of tonequality.
A kind of loudspeaker protection system comprises digital signal processing module, numeral and power amplifier module.Digital signal is handled through digital signal processing module, carry out power detection, and calculate pad value or value of magnification according to the power meter that detects, numeral and power amplifier module carry out correspondence decay or processing and amplifying according to pad value that calculates or value of magnification to digital signal then, the input power that makes digital signal is in the dynamic range of defined loud speaker input signal, and the digital signal after will handling is again imported loud speaker.
Preferably, defined dynamic range is P1min to P1max, and wherein, P1min is that input signal is a white noise, the pairing input signal power of the sound pressure level that people's ear is listened more comfortablely, and P1min is greater than the lower limit input power P0min of loud speaker; P1max is the frequency of input signal when being the simple signal of the resonance frequency of loudspeaker, during the loud speaker total harmonic distortion that records, and the pairing power of input signal this moment, P1max is less than the upper limit input power P0max of loud speaker.
Preferably,, input signal is amplified in the defined dynamic range when the power of input signal during less than P1min, when the power of input signal during greater than P1max, with attenuated input signal to defined dynamic range.
Preferably, when digital signal processing module is handled the digital signal of input is carried out 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, in next t data of gathering some input signals constantly, ask the power P t of this point, deduct the data power P1 of the input signal of n the starting point of putting then, add t performance number Pt constantly, try to achieve average power Pa divided by n then.
Loudspeaker protection system of the present invention has redefined the dynamic range of input signal according to the characteristic of loud speaker, and for loud speaker is provided with best dynamic, the protection loud speaker is not subjected to the impact of high-power input signal.And, because loud speaker carries out work under the less situation of distortion, 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 the protection loud speaker and is not subjected to the audio frequency damage, strengthens advantage such as tonequality.
Description of drawings
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 Figure 1.
Fig. 3 is the signal processing step of loudspeaker protection system shown in Figure 1.
Fig. 4 is the average power calculating method in the signal processing step shown in Figure 3.
Fig. 5 is the calculated examples figure of loudspeaker protection system shown in Figure 1.
Embodiment
Below in conjunction with accompanying drawing loudspeaker protection system structure of the present invention is described.
See also 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 Figure 1, and Fig. 3 is the signal processing step of loudspeaker protection system shown in Figure 1.
Native system is based on digital signal processing platform, it comprise digital signal processing module, numeral (Digital to Analog Converter, DAC) and power amplifier module.In loudspeaker protection system of the present invention, after the digital signal input, handle through digital signal processing module earlier, pass through DAC and power amplifier module then, signal is amplified, be input to loud speaker again.
Among 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, pairing input power when limiting value Xmax appears in the voice coil loudspeaker voice coil of loud speaker vibration just.Usually, injury-free in order to protect loud speaker, its input signal is controlled at below the P0max gets final product.
The present invention has carried out new definition to the dynamic range of loud speaker input signal:
(a), the lower limit of dynamic range is meant that input signal is a white noise, when sound pressure level that people's ear is listened more comfortablely, the power P 1min of the input signal of this moment;
(b), the upper limit of dynamic range is meant when the frequency of input signal is the simple signal of the resonance frequency of loudspeaker, the loud speaker total harmonic distortion that records when the certain limit value, the power P 1max of the input signal of this moment; Wherein, the value range of loud speaker total harmonic distortion need record in advance according to the size and the pure tone test of loud speaker.
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; then this signal is amplified in the new dynamic range; if the power of input signal more than P1max, then with this signal attenuation to the new dynamic range.
In the signal processing step, calculate the average power that input signal n is ordered earlier, obtain pad value or value of magnification again, and then signal is carried out corresponding decay or amplifies back output according to pad value or value of magnification.Wherein, as shown in Figure 4, adopted average power, that is to say for the calculating of power, with the place constantly the value of sampled point ask average power with n value of putting before.Suppose to have collected the signal that n is ordered this moment, try to achieve the signal power sum Pn of n point,, ask the power P t of this point when the data of gathering some input signals at next moment t.At this moment, deduct the data power P1 of the input signal of n the starting point of putting earlier, add t performance number Pt constantly, ask average power Pa divided by n then.According to the average power Pa that tries to achieve this moment, signal is decayed or amplified.When next sampled point, continue to ask average power according to above method.
Illustrate, see also 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.At this moment, the scope of the input signal of loud speaker is-40dB to 0dB.
Record the value range of certain loud speaker total harmonic distortion in advance, according to the present invention to the redetermination of 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, then this moment this loud speaker the scope of input signal be compressed into-29.2dB is to-7.3dB.
Curve A and curve B are represented the signal power variations of being followed when handling input signal respectively.Wherein, than-signal that 40dB is little, think noise signal, do not deal with; Greater than-40dB signal less than 0dB, follow curve A or curve B, with its decay or amplification, to-29.2dB and-7.3dB between, wherein, among Fig. 3 in L point left side for amplifying, be to decay on L point right side.
In last example, the digital signal amplitude is between 0 to 1.Because the yield value of system hardware has been made as 0dB, so only need calculate the power of digital signal this moment, obtains performance number Pin, corresponding power calculation curve A or curve B are carried out signal processing then, obtain performance number Pout.
Have following characteristics at loudspeaker protection system of the present invention:
At first, redefined the dynamic range of input signal according to the characteristic of each loud speaker, for each loud speaker is provided with best dynamic, the protection loud speaker is not subjected to the impact of high-power input signal;
Secondly, because loud speaker carries out work under the less situation of distortion, guaranteed that tonequality is in preferable states, so loudspeaker protection system of the present invention also has the effect of improving tonequality.
Then, be provided with down, regulate, can make low-power level signal sound more clear automatically, make high-power signal sound not ear-piercing without the user in same volume.For example: as one section voice; preceding 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 is the power of signal calculated automatically; make corresponding signal process; faint sound is amplified, can make ear-piercing sound attenuating again.
Also have, owing to adopt the method for average power, make when sign mutation, yield value that calculates or pad value change mild relatively, and signal change is more level and smooth, the distortion that has brought when having reduced signal attenuation or increase.
In sum, loudspeaker protection system of the present invention has the protection loud speaker and is not subjected to audio frequency damage, strengthens advantage such as tonequality.
Only be preferred case study on implementation of the present invention below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, 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. loudspeaker protection system; comprise digital signal processing module; numeral and power amplifier module; be characterised in that: digital signal is handled through digital signal processing module; carry out power detection; and calculate pad value or value of magnification according to the power meter that detects; numeral and power amplifier module carry out correspondence decay or processing and amplifying according to pad value that calculates or value of magnification to digital signal then; the input power that makes digital signal is in the dynamic range of defined loud speaker input signal, and the digital signal after will handling is again imported loud speaker.
2. loudspeaker protection system according to claim 1, it is characterized in that: defined dynamic range is P1min to P1max, wherein, P1min is that input signal is a white noise, the pairing input signal power of the sound pressure level that people's ear is listened more comfortablely, P1min is greater than the lower limit input power P0min of loud speaker; P1max is the frequency of input signal when being the simple signal of the resonance frequency of loudspeaker, during the loud speaker total harmonic distortion that records, and the pairing power of input signal this moment, P1max is less than the upper limit input power P0max of loud speaker.
3. loudspeaker protection system according to claim 2; it is characterized in that: when the power of input signal during less than P1min; input signal is amplified in the defined dynamic range, when the power of input signal during greater than P1max, with attenuated input signal to defined dynamic range.
4. loudspeaker protection system according to claim 2 is characterized in that: it is when the digital signal of input is carried out power detection that digital signal processing module is handled, its calculating be the average power of input signal.
5. loudspeaker protection system according to claim 4; it is characterized in that: after collecting the signal that n orders; ask the signal power sum Pn of n point; in next t data of gathering some input signals constantly; ask the power P t of this point; deduct the data power P1 of the input signal of n the starting point of putting then, add t performance number Pt constantly, try to achieve average power Pa divided by n then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010144848.3A CN101820563B (en) | 2010-04-06 | 2010-04-06 | Speaker protection system |
Applications Claiming Priority (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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| CN101820563A true CN101820563A (en) | 2010-09-01 |
| CN101820563B CN101820563B (en) | 2014-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010144848.3A Expired - Fee Related CN101820563B (en) | 2010-04-06 | 2010-04-06 | Speaker protection system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023438A (en) * | 2012-11-30 | 2013-04-03 | 青岛歌尔声学科技有限公司 | Audio distortion adjustment control equipment and audio distortion adjusting method |
| CN108307228A (en) * | 2018-02-05 | 2018-07-20 | 深圳创维－Rgb电子有限公司 | Effect adjusting method, device, television set and storage medium |
| CN111741410A (en) * | 2020-06-15 | 2020-10-02 | 中科上声（苏州）电子有限公司 | Configuration method and device of dynamic range compressor in loudspeaker equalization |
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| CN1239860A (en) * | 1999-05-05 | 1999-12-29 | 刘达强 | Constant power driving method for loudspeaker |
| US20050276425A1 (en) * | 2004-05-28 | 2005-12-15 | Christopher Forrester | System and method for adjusting an audio signal |
| 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 |
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2010
- 2010-04-06 CN CN201010144848.3A patent/CN101820563B/en not_active Expired - Fee Related
Patent Citations (4)
| 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 |
| US20050276425A1 (en) * | 2004-05-28 | 2005-12-15 | Christopher Forrester | System and method for adjusting an audio signal |
| 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 (1)
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| 孟昭勇等: "一种多功能电力监控装置的研究", 《继电器》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023438A (en) * | 2012-11-30 | 2013-04-03 | 青岛歌尔声学科技有限公司 | Audio distortion adjustment control equipment and audio distortion adjusting method |
| 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 |
| CN108307228A (en) * | 2018-02-05 | 2018-07-20 | 深圳创维－Rgb电子有限公司 | Effect adjusting method, device, television set and storage medium |
| CN111741410A (en) * | 2020-06-15 | 2020-10-02 | 中科上声（苏州）电子有限公司 | Configuration method and device of dynamic range compressor in loudspeaker equalization |
| 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 |
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| CN101820563B (en) | 2014-01-29 |
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