CN105549946A - Intelligent audio system - Google Patents
Intelligent audio system Download PDFInfo
- Publication number
- CN105549946A CN105549946A CN201510900021.3A CN201510900021A CN105549946A CN 105549946 A CN105549946 A CN 105549946A CN 201510900021 A CN201510900021 A CN 201510900021A CN 105549946 A CN105549946 A CN 105549946A
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- CN
- China
- Prior art keywords
- loudspeaker
- power amplifier
- audio system
- intelligent audio
- output power
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/16—Sound input; Sound output
- G06F3/162—Interface to dedicated audio devices, e.g. audio drivers, interface to CODECs
Abstract
The invention discloses an intelligent audio system. The intelligent audio system comprises a digital signal processor (DSP), a power amplifier and a horn, wherein the DSP integrates a horn model; the horn model is used for describing relationships between the output power of the power amplifier and the amplitude of a horn diaphragm and between the output power of the power amplifier and the temperature of the horn diaphragm; and the DSP controls real-time output power of the power amplifier based on the horn model so as to control the output volume of the horn. Therefore, the intelligent audio system can ensure that sound distortion or horn damage is not caused when the horn performance is played as far as possible.
Description
Technical field
The present invention relates to a kind of intelligent audio system.
Background technology
Current mobile device horn volume is not high, is mainly limited to following factor: sound cavity volume is little, and horn diaphragm amplitude is little, and mobile device cell voltage is low, and power amplifier fan-out capability is limited, and loudspeaker expressive ability is very limited, even if through some hardware circuits (such as: the driving force by boosting circuit boosts power amplifier) and some software algorithm (Drac, Doby etc.) also can only be limited raising loudspeaker expressive ability, main cause is to monitor the temperature of the amplitude of speaker body diaphragm and loudspeaker, in order to ensure that horn diaphragm does not exceed maximum displacement and causes audio distortions or the too high loudspeaker that cause of temperature to damage, current mobile device can only when ensureing that sound is undistorted or loudspeaker do not damage, go to drive loudspeaker with lower power, cause mobile device horn volume too low.
Summary of the invention
The technical matters that the present invention mainly solves how to ensure that loudspeaker play performance to greatest extent and are unlikely to again cause audio distortions or damage loudspeaker.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: provide a kind of intelligent audio system, described intelligent audio system comprises digital signal processor DSP and power amplifier, loudspeaker, the integrated loudspeaker model of described DSP, described loudspeaker model is for describing the relation of the temperature of described power amplifier output power and horn diaphragm amplitude, described power amplifier output power and horn diaphragm, described DSP is based on described loudspeaker model, control the real-time output power of described power amplifier, thus control the output volume of loudspeaker.
Wherein, described intelligent audio system also comprises feedback circuit, described DSP obtains real time environment temperature from source of sound, the output power of described power amplifier is detected by described feedback circuit, the real-time amplitude of horn diaphragm and real time temperature is obtained according to described loudspeaker model, based on loudspeaker model, control the real-time output power of described power amplifier.
Wherein, described intelligent audio system also comprises booster circuit, and described DSP, based on described loudspeaker model, controls the voltage magnitude of described booster circuit and the gain of described power amplifier in real time, and then controls the output power of described power amplifier.
Wherein, described intelligent audio system also comprises power supply, provides voltage for giving described booster circuit.
Wherein, described DSP is based on described loudspeaker model, control the real-time output power of described power amplifier, thus the output volume controlling described loudspeaker comprises: described DSP is based on the maximum displacement of loudspeaker model and maximum temperature rise in described loudspeaker model, the real-time output power of the described power amplifier of real-time adjustment, thus control the output volume of described loudspeaker.
Wherein, described loudspeaker model is set up by the following method: obtain the resonance frequency f0 of loudspeaker in airtight sound chamber; Playing frequency is the pink noise of f0, the receptible maximum THD+N parameter value of equipment is no more than at guarantee total harmonic distortion plus noise THD+N, horn diaphragm amplitude is no more than maximum safe displacement, and under horn diaphragm temperature is no more than maximum withstand temperature state, progressively improve power amplifier output power, detect horn diaphragm amplitude simultaneously, thus obtain the relation of the temperature of the relation of horn diaphragm amplitude and power amplifier output power, power amplifier output power and horn diaphragm.
Wherein, described maximum withstand temperature T obtains in the following manner: T=t
0+ P/ θ
0, wherein, t
0for the environment temperature obtained from source of sound, P is loudspeaker output power, and described loudspeaker output power is calculated by the electric current of power amplifier output terminal and voltage, θ
0for horn diaphragm temperature rise coefficient.
Wherein, described detection horn diaphragm amplitude comprises: detection horn diaphragm center and surrounding make a reservation for the diaphragm excursion of multiple symmetric points position.
The invention has the beneficial effects as follows: the situation being different from prior art, the present invention passes through at the integrated loudspeaker model of intelligent audio system DSP, wherein loudspeaker model describes power amplifier output power and diaphragm excursion relation, the model of power amplifier output power and diaphragm temperature relation, DSP based on the real-time output power of loudspeaker model to control power amplifier, thus controls the output volume of loudspeaker.Owing to being adjust power amplifier output power in real time based on loudspeaker model, thus can ensure that loudspeaker play performance to greatest extent and have and be unlikely to cause audio distortions or damage loudspeaker.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of mobile device loudspeaker;
Fig. 2 is the schematic diagram of conventional audio power amplifier;
Fig. 3 is the structural representation of the intelligent audio system that the embodiment of the present invention provides;
Fig. 4 is under the rated power that provides of the embodiment of the present invention, the relation schematic diagram of diaphragm excursion and frequency and sound cavity volume.
Embodiment
In order to clearly introduce the present invention, first one is done to loudspeaker principle and conventional audio power amplifier below and simply introduces.
Refer to Fig. 1, Fig. 1 is a kind of structural representation of mobile device loudspeaker, and the realization of sound horn mainly drives diaphragm vibrations to send different sound by changing the electric current flowing through voice coil loudspeaker voice coil.
Further combined with Fig. 2, Fig. 2 is the schematic diagram of conventional audio power amplifier, in traditional audio power amplifier circuit, belong to unidirectional drive, cannot monitor the state of loudspeaker, amplitude and temperature conditions the unknown, can only with less power drive loudspeaker, loudspeaker expressive ability is limited, causes mobile device volume too low.
The present invention is intended to the above technical matters solving prior art, provides a kind of intelligent audio system, drives loudspeaker, lifting mobile device voice volume, can not damage loudspeaker again simultaneously with the actual peak power that loudspeaker can bear.
Refer to Fig. 3, Fig. 3 is the structural representation of the intelligent audio system that the embodiment of the present invention provides, as shown in the figure, the intelligent audio system of the present embodiment comprises digital signal processor DSP 11 and power amplifier 12, loudspeaker 13, the integrated loudspeaker model of DSP, loudspeaker model is for describing the relation of the temperature of power amplifier output power and horn diaphragm amplitude, power amplifier output power and horn diaphragm, and DSP is based on loudspeaker model, control the real-time output power of power amplifier, thus control the output volume of loudspeaker.
Wherein, the intelligent audio system of the present embodiment also comprises feedback circuit 14 further, DSP obtains real time environment temperature from source of sound, the output power of power amplifier is detected by feedback circuit, the real-time amplitude of horn diaphragm and real time temperature is obtained according to loudspeaker model, based on loudspeaker model, control the real-time output power of power amplifier.
Wherein, the intelligent audio system of the present embodiment also comprises booster circuit 15, DSP based on loudspeaker model, controls the voltage magnitude of booster circuit and the gain of power amplifier in real time, and then controls the output power of power amplifier.
Wherein, the intelligent audio system of the present embodiment also comprises power supply 16, provides voltage for giving booster circuit 15.
Wherein, the principle of work of the intelligent audio system of the embodiment of the present invention is as follows: by the inner integrated DSP of power amplifier, the loudspeaker model that the upper operation of DSP has been set up, DSP obtains real time environment temperature from mobile device AP source of sound end, the voltage and current of power amplifier output is detected by backfeed loop, according to the loudspeaker model set up, draw the amplitude that loudspeaker are real-time and temperature, then according to the sound source signal of input, the temperature rise coefficient of loudspeaker, (VCC is larger to adjust the supply voltage VCC boosting amplitude of booster circuit (adjustment) of power amplifier and gain in real time according to horn diaphragm maximum displacement and maximum temperature rise, gain is larger, loudspeaker output volume is larger), promote output power as much as possible, ensure that loudspeaker play performance to greatest extent and are unlikely to again cause audio distortions or damage loudspeaker, ensure the not super maximum displacement of horn diaphragm simultaneously, temperature is no more than maximum temperature, ensure the loudspeaker life-span.
Wherein, the intelligent audio system in the embodiment of the present invention, carrys out specific implementation sound horn based on loudspeaker model and controls, and wherein, the loudspeaker model in the embodiment of the present invention is that the basis based on mobile device parametric loudspeaker is set up with under type.
First, the characteristic parameter of mobile device loudspeaker refers to following table 1:
Table 1
More than in table, f0 is loudspeaker resonance frequency, usually at f0 place, horn diaphragm has maximum displacement, f0 is relevant with sound cavity volume residing for loudspeaker, Excursion is horn diaphragm displacement under rated power, under rated power, the schematic diagram that the relation of diaphragm excursion and frequency and sound cavity volume is shown in Figure 4.
The loudspeaker model of the embodiment of the present invention is set up by the following method:
1, the resonance frequency f0 of loudspeaker in airtight sound chamber is obtained;
2, playing frequency is the pink noise of f0, the receptible maximum THD+N parameter value of equipment is no more than at guarantee total harmonic distortion plus noise THD+N, horn diaphragm amplitude is no more than maximum safe displacement, and under horn diaphragm temperature is no more than maximum withstand temperature state, progressively improve power amplifier output power, detect horn diaphragm amplitude simultaneously, thus obtain the relation of the temperature of the relation of horn diaphragm amplitude and power amplifier output power, power amplifier output power and horn diaphragm.
Wherein, detect horn diaphragm amplitude and mainly detect the diaphragm excursion that horn diaphragm center and surrounding make a reservation for multiple symmetric points position, the such as diaphragm excursion of surrounding 4 symmetric points positions.
Detailed process is as follows:
1) loudspeaker are placed in mobile device sound chamber, the f0 of test horn in airtight sound chamber
2) playing frequency is the pink noise of f0, setting mobile device the parameter value a of receptible maximum THD+N
0, progressively improve power amplifier booster circuit voltage, and improve power amplifier gain factor, detect horn diaphragm amplitude simultaneously, detect horn diaphragm center and four Thursdays a symmetric points position diaphragm excursion, ensure that diaphragm excursion is no more than maximum safe displacement S
0, THD+N is no more than setting value a
0.Draw the relation of horn diaphragm amplitude and power amplifier output power.
3) in the process progressively improving power amplifier output power, the temperature rise coefficient of environment temperature and horn diaphragm and the real-time output power of power amplifier is utilized to calculate the real time temperature of diaphragm, the while of carrying high-power, ensure that horn diaphragm is no more than maximum withstand temperature T.
T=t
0+ P/ θ
0, wherein t
0for environment temperature, can hold from mobile device AP and obtain, P is loudspeaker output power, θ
0for horn diaphragm temperature rise coefficient.P can detect the electric current of power amplifier output terminal by power amplifier and voltage calculates.
4) to sum up, export electric signal THD+N at guarantee power amplifier and be no more than a
0, diaphragm maximum displacement is no more than safe displacement S
0, horn diaphragm temperature is no more than maximum withstand temperature T
0, record maximum amplitude and the power amplifier gain of the output voltage of power amplifier booster circuit.
By finding loudspeaker modeling process, when power amplifier supply voltage promotes, in equal THD+N situation, output power can significantly improve.
The intelligent audio system that the above embodiment of the present invention provides, by at the integrated loudspeaker model of intelligent audio system DSP, wherein loudspeaker model describes power amplifier output power and diaphragm excursion relation, the model of power amplifier output power and diaphragm temperature relation, the state of loudspeaker can be monitored in real time according to the mathematical model set up, comprise diaphragm displacement and temperature, DSP adjusts power amplifier supply voltage VCC and gain in real time based on loudspeaker model, thus controls the output volume of loudspeaker.Owing to being adjust power amplifier output power in real time based on loudspeaker model, thus can ensure that loudspeaker play performance to greatest extent and have and be unlikely to cause audio distortions or damage loudspeaker.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize instructions of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (8)
1. an intelligent audio system, it is characterized in that, described intelligent audio system comprises digital signal processor DSP and power amplifier, loudspeaker, the integrated loudspeaker model of described DSP, described loudspeaker model is for describing the relation of the temperature of described power amplifier output power and horn diaphragm amplitude, described power amplifier output power and horn diaphragm, described DSP, based on described loudspeaker model, controls the real-time output power of described power amplifier, thus controls the output volume of loudspeaker.
2. intelligent audio system according to claim 1, it is characterized in that, described intelligent audio system also comprises feedback circuit, described DSP obtains real time environment temperature from source of sound, the output power of described power amplifier is detected by described feedback circuit, obtain the real-time amplitude of horn diaphragm and real time temperature according to described loudspeaker model, based on loudspeaker model, control the real-time output power of described power amplifier.
3. intelligent audio system according to claim 1, it is characterized in that, described intelligent audio system also comprises booster circuit, and described DSP is based on described loudspeaker model, the voltage magnitude of the described booster circuit of real-time control and the gain of described power amplifier, and then control the output power of described power amplifier.
4. intelligent audio system according to claim 3, is characterized in that, described intelligent audio system also comprises power supply, provides voltage for giving described booster circuit.
5. intelligent audio system according to claim 1, is characterized in that, described DSP, based on described loudspeaker model, control the real-time output power of described power amplifier, thus the output volume controlling described loudspeaker comprises:
Described DSP, based on the maximum displacement of loudspeaker model and maximum temperature rise in described loudspeaker model, adjusts the real-time output power of described power amplifier in real time, thus controls the output volume of described loudspeaker.
6. intelligent audio system according to claim 1, is characterized in that, described loudspeaker model is set up by the following method:
Obtain the resonance frequency f0 of loudspeaker in airtight sound chamber;
Playing frequency is the pink noise of f0, the receptible maximum THD+N parameter value of equipment is no more than at guarantee total harmonic distortion plus noise THD+N, horn diaphragm amplitude is no more than maximum safe displacement, and under horn diaphragm temperature is no more than maximum withstand temperature state, progressively improve power amplifier output power, detect horn diaphragm amplitude simultaneously, thus obtain the relation of the temperature of the relation of horn diaphragm amplitude and power amplifier output power, power amplifier output power and horn diaphragm.
7. intelligent audio system according to claim 6, is characterized in that, described maximum withstand temperature T obtains in the following manner:
T=t
0+ P/ θ
0, wherein, t
0for the environment temperature obtained from source of sound, P is loudspeaker output power, and described loudspeaker output power is calculated by the electric current of power amplifier output terminal and voltage, θ
0for horn diaphragm temperature rise coefficient.
8. intelligent audio system according to claim 6, is characterized in that, described detection horn diaphragm amplitude comprises: detection horn diaphragm center and surrounding make a reservation for the diaphragm excursion of multiple symmetric points position.
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| CN201510900021.3A CN105549946A (en) | 2015-12-08 | 2015-12-08 | Intelligent audio system |
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|---|---|---|---|
| CN201510900021.3A CN105549946A (en) | 2015-12-08 | 2015-12-08 | Intelligent audio system |
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| CN106534411A (en) * | 2016-11-09 | 2017-03-22 | Tcl通讯（宁波）有限公司 | Volume boost driving device and mobile terminal |
| CN108668193A (en) * | 2017-03-30 | 2018-10-16 | 展讯通信（上海）有限公司 | A kind of bass enhancing method, device and playback equipment for playback equipment |
| TWI641269B (en) * | 2017-06-07 | 2018-11-11 | 瑞昱半導體股份有限公司 | Audio playback device and audio control circuit of the same |
| CN110519458A (en) * | 2019-08-27 | 2019-11-29 | 广东小天才科技有限公司 | A kind of electronic equipment and control method applied to electronic equipment |
| TWI690215B (en) * | 2018-07-20 | 2020-04-01 | 瑞昱半導體股份有限公司 | Adaptive temperature audio amplifier device and control method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106534411A (en) * | 2016-11-09 | 2017-03-22 | Tcl通讯（宁波）有限公司 | Volume boost driving device and mobile terminal |
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| TWI641269B (en) * | 2017-06-07 | 2018-11-11 | 瑞昱半導體股份有限公司 | Audio playback device and audio control circuit of the same |
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| CN110519458A (en) * | 2019-08-27 | 2019-11-29 | 广东小天才科技有限公司 | A kind of electronic equipment and control method applied to electronic equipment |
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Application publication date: 20160504 |