CN103716732A - Loudspeaker system and detection method for the same - Google Patents
Loudspeaker system and detection method for the same Download PDFInfo
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- CN103716732A CN103716732A CN201210378938.8A CN201210378938A CN103716732A CN 103716732 A CN103716732 A CN 103716732A CN 201210378938 A CN201210378938 A CN 201210378938A CN 103716732 A CN103716732 A CN 103716732A
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Abstract
This invention provides a loudspeaker system which is applied in an electronic device. The loudspeaker system comprises an audio frequency amplifier, a loudspeaker, a detection resistor and a control-processing unit. The audio frequency amplifier, the loudspeaker and the detection resistor form a current loop. The audio frequency amplifier outputs voltage to the loudspeaker; the control-processing unit is electrically connected to the detection resistor and the audio frequency amplifier for detecting the voltage value of the detection resistor on real time, calculating current going through the loudspeaker and real-time output power according to the detected real time voltage value and the resistance value of the detection resistor, and comparing the real-time output power of the loudspeaker with the rated power of the loudspeaker. When the real-time output power is higher than the rated power, the control-processing unit controls the audio frequency amplifier to reduce the output voltage. The invention also provides a method for detecting the loudspeaker system.
Description
Technical field
The present invention relates to a kind of speaker system of electronic installation, particularly a kind of speaker system and detection method thereof with power detection and regulatory function.
Background technology
The loud speaker of electronic installation when displaying audio file, may be because of the audio file capacity of playing the factors such as excessive or reproduction time is long make speaker in heavily loaded state, easily cause the infringement of loud speaker.In order to address the above problem, the rated power of generally exporting to loud speaker by restricting audio amplifier carrys out the power output of control loudspeaker, but, because audio frequency amplifier, audio codec and loudspeaker performance three's impedance generally there are differences, more difficult accurately by the output power limit of loud speaker within the scope of this rated power, the power output easily causing is on the contrary excessive or too small, is unfavorable for the long-term use of loud speaker.
Summary of the invention
In view of this, be necessary to provide a kind of speaker system that can detect in real time and regulate power of loudspeaker.
A kind of detection method of this speaker system is also provided in addition.
A speaker system, is applied to electronic installation.Described speaker system comprises audio frequency amplifier, loud speaker, detect resistance and controlled processing unit, this audio frequency amplifier, loud speaker and the series connection of detection resistance form current circuit, this audio frequency amplifier is to this loud speaker output voltage, this controlled processing unit is electrically connected at this detection resistance and this audio frequency amplifier, for detecting in real time the magnitude of voltage that this detects resistance, and calculate the real-time current of the loud speaker of flowing through and power output in real time according to the resistance value of the real-time voltage value recording and this detection resistance, and relatively real-time power output and its rated power of this loud speaker, when this real-time power output is during higher than this rated power, this controlled processing unit is controlled this audio frequency amplifier and is reduced its output voltage.
A speaker system detection method, it comprises the steps: S1, audio frequency amplifier output voltage provides speaker operation voltage, so that audio frequency amplifier, loud speaker and detection resistance form current circuit; S2, controlled processing unit arranges the rated power of this loud speaker; S3, this controlled processing unit detects the magnitude of voltage at these detection resistance two ends in real time; S4, this controlled processing unit calculates real-time current value and the real-time power output of this loud speaker of flowing through; S5, this controlled processing unit is real-time power output and the rated power of this loud speaker relatively, if this real-time power output is less than this rated power, audio frequency amplifier keeps current output voltage, if this real-time power output is greater than this rated power, controlled processing unit control audio frequency amplifier reduces its output voltage.
Above-mentioned speaker system is passed through Series detectors resistance between audio frequency amplifier and loud speaker, and is electrically connected to by filter and controlled processing unit the two ends of detecting resistance, to detect in real time the magnitude of voltage of this detection resistance.By controlled processing unit, calculate real-time current value and the real-time power output of the loud speaker of flowing through, and judge that whether this loud speaker works in heavy duty, adjusts the power output of this loud speaker accordingly.Can effectively protect loud speaker like this, be conducive to the long-term use of loud speaker.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of the speaker system of better embodiment of the present invention;
Fig. 2 is the flow chart of the power of loudspeaker detection method of speaker system shown in Fig. 1.
Main element symbol description
| |
100 |
| |
10 |
| |
20 |
| Detect |
30 |
| |
40 |
| Controlled |
50 |
Following embodiment further illustrates the present invention in connection with above-mentioned accompanying drawing.
Embodiment
Refer to Fig. 1, the speaker system 100 that better embodiment of the present invention provides, it can be used in the various electronic installation (not shown) that loud speaker is installed, as mobile phone, notebook computer and personal digital assistant (Personal Digital Assistant, PDA) etc., with the real-time power output of the loud speaker 20 of detection. electronics.
Described speaker system 100 comprises audio frequency amplifier 10, loud speaker 20, detects resistance 30, filter 40 and controlled processing unit 50.This audio frequency amplifier 10 is electrically connected to loud speaker 20, with thinking that loud speaker 20 provides operating voltage.This audio frequency amplifier 10 provides output voltage V o to this loud speaker 20.
Described loud speaker 20 is for displaying audio file, during this loud speaker 20 work according to the output voltage V o of this audio frequency amplifier 10, with the power output work of being scheduled to.This loud speaker 20 has a rated power, power output when loud speaker 20 work is the work safety power output of this loud speaker 20 during lower than this rated power, power output when its work is during higher than this rated power, and this loud speaker 20 is in heavily loaded operating state.
Described detection resistance 30 is series between this audio frequency amplifier 10 and this loud speaker 20, so that this audio frequency amplifier 10, loud speaker 20 and detection resistance 30 form current circuits.The resistance of this detection resistance 30 is Rext, and in the present embodiment, the resistance of this detection resistance 30 is for being less than 1 ohm.This detection resistance 30 is for detection of the electric current of the loud speaker 20 of flowing through when loud speaker 20 is worked.
Described filter 40 is electrically connected to the two ends of this detection resistance 30.In the present embodiment, this filter is a low pass filter, for the high-frequency signal of this speaker system 100 of filtering, as D class high-frequency signal, to obtain the direct voltage of comparatively ideal this detection resistance 30.
Described controlled processing unit 50 is electrically connected at respectively this filter 40 and this audio frequency amplifier 10.This controlled processing unit 50 can be central processing unit (the Central Processing Unit of electronic installation, CPU), it can comprise an analog to digital converter, for detecting in real time the real-time voltage value that this detects resistance 30 two ends, and calculate after converting this magnitude of voltage to digital signal, this controlled processing unit 50 is by real-time voltage value and its resistance value of this detection resistance 30 of recording, can obtain the real-time current value on this detection resistance 30, that is the real-time current value of this loud speaker 20 of flowing through, output voltage by this real-time current value and this audio frequency amplifier 10 can calculate the current power output of acquisition loud speaker 20 again.This controlled processing unit 50 is real-time power output and its rated power of this loud speaker 20 relatively, and judge that whether this loud speaker 20 is in heavy duty.
If the realtime power of the loud speaker 20 that this controlled processing unit 50 records is lower than its rated power, this audio frequency amplifier 10 keeps current output voltage V o.If the realtime power of the loud speaker recording 20 is higher than its rated power, loud speaker 20 is in heavy duty, this controlled processing unit 50 can be controlled these audio frequency amplifier 10 adjustment and limit its output voltage V o, until recording the real-time power output of this loud speaker 20, this controlled processing unit 50 is down to after its rated power the output voltage V o that holding tone audio amplifier 10 is current.
Refer to Fig. 2, when the electronic installation that this speaker system 100 is installed is when using this loud speaker 20 work, when by loud speaker 20 displaying audio file, can carry out according to following power of loudspeaker detection method:
Step S01, this audio frequency amplifier 10 provides this loud speaker 20 operating voltages with the output voltage V o being scheduled to.This audio frequency amplifier 10, loud speaker 20 and detection resistance 30 form current circuits.
Step S02, this controlled processing unit 50 arranges the rated power of this loud speaker 20, and this rated power is the critical value of the trouble free service of this loud speaker 20.
Step S03, this controlled processing unit 50 detects the magnitude of voltage Vext that this detects resistance 30 two ends in real time.
Step S04, this controlled processing unit 50 calculates the real-time current value Ispk=Vext/Rext of this loud speaker 20 of flowing through by the resistance value Rext of this detection resistance 30.
Step S05, this controlled processing unit 50 calculates the real-time power output of this loud speaker 20 by the operating voltage Vo of this real-time current value Iext and this loud speaker 20.
Step S06, relatively real-time power output and its rated power of loud speaker 20.If this real-time power output is less than this rated power, this loud speaker 20 works in safe output power range, performs step S07; If this real-time power output is greater than this rated power, this loud speaker 20, in heavy condition, performs step S08.
Step S07, this loud speaker 20 keeps current power output work.
Step S08; this controlled processing unit 50 is adjusted the output voltage of controlling this audio frequency amplifier 10; so that adjust the real-time power output of this loud speaker 20, be down to its rated power or be down to this below rated power; thereby what make this loud speaker 20 works in rated power or following, to protect this loud speaker 20.
Be appreciated that the power output of this controlled processing unit 50 this loud speaker 20 that calculates and to this loud speaker 20 of its rated power contrast judgement whether in heavily loaded information and relevant information, can show by the display unit of electronic installation, for user, check.
Claims (10)
1. a speaker system, be applied to electronic installation, it is characterized in that: described speaker system comprises audio frequency amplifier, loud speaker, detect resistance and controlled processing unit, this audio frequency amplifier, loud speaker and the series connection of detection resistance form current circuit, this audio frequency amplifier is to this loud speaker output voltage, this controlled processing unit is electrically connected at this detection resistance and this audio frequency amplifier, for detecting in real time the magnitude of voltage that this detects resistance, and calculate the real-time current of the loud speaker of flowing through and power output in real time according to the resistance value of the real-time voltage value recording and this detection resistance, and relatively real-time power output and its rated power of this loud speaker, when this real-time power output is during higher than this rated power, this controlled processing unit is controlled this audio frequency amplifier and is reduced its output voltage.
2. speaker system as claimed in claim 1, is characterized in that: described speaker system also comprises filter, and it is electrically connected at the two ends of this detection resistance, and is electrically connected at this controlled processing unit, for filtering high-frequency signal.
3. speaker system as claimed in claim 1, it is characterized in that: described controlled processing unit compares recording the real-time power output of this loud speaker and the rated power of this loud speaker, if this real-time power output is lower than this rated power, this audio frequency amplifier keeps current output voltage.
4. speaker system as claimed in claim 1, is characterized in that: described filter is low pass filter, in order to the high-frequency signal in this speaker system of filtering, so that this control processor obtains comparatively ideal this, detects the voltage of resistance.
5. speaker system as claimed in claim 1, is characterized in that: the resistance of described detection resistance is less than 1 ohm.
6. speaker system as claimed in claim 1, is characterized in that: whether the real-time power output of this loud speaker that described controlled processing unit records and this loud speaker are shown in the display unit of this electronic installation in heavily loaded information.
7. speaker system as claimed in claim 1, is characterized in that: described controlled processing unit is central processing unit.
8. a speaker system detection method, is characterized in that, this speaker system detection method comprises the steps:
S1, audio frequency amplifier output voltage provides speaker operation voltage, so that audio frequency amplifier, loud speaker and detection resistance form current circuit;
S2, controlled processing unit arranges the rated power of this loud speaker;
S3, this controlled processing unit detects the magnitude of voltage at these detection resistance two ends in real time;
S4, this controlled processing unit calculates real-time current value and the real-time power output of this loud speaker of flowing through;
S5, this controlled processing unit is real-time power output and the rated power of this loud speaker relatively, if this real-time power output is less than this rated power, audio frequency amplifier keeps current output voltage, if this real-time power output is greater than this rated power, controlled processing unit control audio frequency amplifier reduces its output voltage.
9. the speaker system detection method as described in claim .8, it is characterized in that: the resistance of described detection resistance is less than 1 ohm, this controlled processing unit is according to the real-time voltage value at the detection resistance two ends that detect and the computing the resistor value that the detects resistance real-time current value of loud speaker of flowing through, and according to this real-time current value, calculates the real-time power output of this loud speaker.
10. the speaker system detection method as described in claim .8, it is characterized in that: when the real-time power output of loud speaker being detected and be greater than rated power, this speaker is in heavy condition, controlled processing unit is controlled audio frequency amplifier and is reduced its output voltage, so that adjust the power output of loud speaker, is down to this rated power or following.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210378938.8A CN103716732A (en) | 2012-10-09 | 2012-10-09 | Loudspeaker system and detection method for the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210378938.8A CN103716732A (en) | 2012-10-09 | 2012-10-09 | Loudspeaker system and detection method for the same |
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| CN103716732A true CN103716732A (en) | 2014-04-09 |
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| CN201210378938.8A Pending CN103716732A (en) | 2012-10-09 | 2012-10-09 | Loudspeaker system and detection method for the same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113803A (en) * | 2014-07-17 | 2014-10-22 | 瑞声声学科技(深圳)有限公司 | Multi-voice-coil based loudspeaker system |
| CN105721986A (en) * | 2016-05-06 | 2016-06-29 | 深圳精拓创新科技有限公司 | Power amplifier circuit and loudspeaker system |
| CN106658295A (en) * | 2017-01-20 | 2017-05-10 | 深圳市中移联半导体科技有限公司 | Loudspeaker direct voltage detection circuit |
| CN108462931A (en) * | 2018-02-07 | 2018-08-28 | 深圳创维－Rgb电子有限公司 | A kind of audio-frequency test equipment and control method |
| CN111131992A (en) * | 2018-10-31 | 2020-05-08 | 神讯电脑(昆山)有限公司 | Micro loudspeaker detection system and detection method thereof |
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| CN1269632A (en) * | 1998-10-30 | 2000-10-11 | 英特赛尔公司 | Overcurrent sensing circuit and self-regulating blankoff |
| US20040176955A1 (en) * | 2002-12-20 | 2004-09-09 | Farinelli Robert P. | Method and system for digitally controlling a multi-channel audio amplifier |
| US20090257599A1 (en) * | 2008-04-10 | 2009-10-15 | Bang & Olufsen Icepower A/S | Thermal protection of electro dynamic transducers used in loudspeaker systems |
| CN201374809Y (en) * | 2009-01-05 | 2009-12-30 | 深圳市同洲电子股份有限公司 | Loudspeaker protective device and mobile communication terminal |
| CN201608692U (en) * | 2010-02-08 | 2010-10-13 | 新昌有限公司 | Energy-saving power amplifying device |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1269632A (en) * | 1998-10-30 | 2000-10-11 | 英特赛尔公司 | Overcurrent sensing circuit and self-regulating blankoff |
| US20040176955A1 (en) * | 2002-12-20 | 2004-09-09 | Farinelli Robert P. | Method and system for digitally controlling a multi-channel audio amplifier |
| US20090257599A1 (en) * | 2008-04-10 | 2009-10-15 | Bang & Olufsen Icepower A/S | Thermal protection of electro dynamic transducers used in loudspeaker systems |
| CN201374809Y (en) * | 2009-01-05 | 2009-12-30 | 深圳市同洲电子股份有限公司 | Loudspeaker protective device and mobile communication terminal |
| CN201608692U (en) * | 2010-02-08 | 2010-10-13 | 新昌有限公司 | Energy-saving power amplifying device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113803A (en) * | 2014-07-17 | 2014-10-22 | 瑞声声学科技(深圳)有限公司 | Multi-voice-coil based loudspeaker system |
| CN105721986A (en) * | 2016-05-06 | 2016-06-29 | 深圳精拓创新科技有限公司 | Power amplifier circuit and loudspeaker system |
| CN105721986B (en) * | 2016-05-06 | 2019-08-27 | 深圳精拓创新科技有限公司 | Power amplifier and speaker system |
| CN106658295A (en) * | 2017-01-20 | 2017-05-10 | 深圳市中移联半导体科技有限公司 | Loudspeaker direct voltage detection circuit |
| CN108462931A (en) * | 2018-02-07 | 2018-08-28 | 深圳创维－Rgb电子有限公司 | A kind of audio-frequency test equipment and control method |
| CN111131992A (en) * | 2018-10-31 | 2020-05-08 | 神讯电脑(昆山)有限公司 | Micro loudspeaker detection system and detection method thereof |
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Application publication date: 20140409 |