CN201018655Y - Loudspeaker system of using pulsewidth modulation signal to save power consumption - Google Patents
Loudspeaker system of using pulsewidth modulation signal to save power consumption Download PDFInfo
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- CN201018655Y CN201018655Y CNU2006201671095U CN200620167109U CN201018655Y CN 201018655 Y CN201018655 Y CN 201018655Y CN U2006201671095 U CNU2006201671095 U CN U2006201671095U CN 200620167109 U CN200620167109 U CN 200620167109U CN 201018655 Y CN201018655 Y CN 201018655Y
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Abstract
The utility model relates to a speaker system. A pulse width modulation signal is the signal importer for the driving of the speaker system, and the working period of a left and right ear acoustic channel audio frequency is adjusted by the pulse width modulation signal. When the audio frequency is not imported into the left or the right ear acoustic channel, in the adjusted working period, the unnecessary expendable power in the speaker system can be avoided. The pulse width modulation signal and a wave signal source where the impulse width modulate is produced, which can be utilized for strengthening the synchronous character of the audio frequency exported from the speaker system, and reduce the noise, and raise the audio frequency quality exported from the speaker system. The speaker system is suitable for a D type amplifier.
Description
Technical field
The utility model is relevant to a kind of speaker system, refers to that especially a kind of pulse width modulating signal that uses is to save the speaker system of power consumption.
Background technology
Generally employed on the market earphone uses two sound channels and a source driving signal all at least, and wherein two sound channels are the sound channel that left ear and auris dextra use separately, and assists the promotion loud speaker with this source driving signal.Moreover above-mentioned left otoacoustic emission road, auris dextra sound channel and this source driving signal all can be added an operational amplifier separately and be strengthened its signal strength signal intensity.Under general situation, the current potential of this source driving signal is about
VCC, wherein VCC is the current potential of the employed biasing of the audio frequency amplifier of the audio signal of generation left otoacoustic emission road and auris dextra sound channel with voltage, wherein this audio frequency amplifier can be a D class A amplifier A.Yet, owing to be not provided with suitable synchronization mechanism between left otoacoustic emission road, auris dextra sound channel and this drive signal, therefore very easily produce the asynchronous noise that causes, and owing to be not provided with suitable analogue ground, therefore also this noise can't be discharged, and the related decline that causes sound quality.In addition, when left otoacoustic emission road or auris dextra sound channel do not have the audio frequency input, continue to use this source driving signal to promote loud speaker and also can cause waste on the power.
The utility model content
Therefore, the purpose of this utility model provides a kind of pulse width modulating signal that uses to save the speaker system of power consumption, to save when left otoacoustic emission road or auris dextra sound channel do not have audio frequency to import, continue to promote the power that loud speaker is wasted with source driving signal, and utilize the characteristic of pulse width modulating signal, make the synchronism mass-energy of audio frequency of left otoacoustic emission road that the user hears via loud speaker and auris dextra sound channel enough strengthen and avoid noise.
In order to realize above-mentioned and other purposes of the present utility model, comprise one first signal source, one first comparator, a secondary signal source, one first audio frequency input source, one second comparator, one second audio frequency input source, one the 3rd comparator, one first loud speaker, reach one second loud speaker according to speaker system of the present utility model.The positive input terminal of this first comparator is connected to this first signal source.This secondary signal source is connected to the negative input end of this first comparator.The positive input terminal of this second comparator is connected to this first signal source, and negative input end is coupled to this first audio frequency input source.The positive input terminal of the 3rd comparator is connected to this first signal source, and negative input end is coupled to this second audio frequency input source.The first input end of this first loud speaker is connected to the output of this first comparator, and second input is connected to the output of this second comparator.The first input end of this second loud speaker is connected to the output of this first comparator, and second input is connected to the output of the 3rd comparator.
This shows, speaker system provided by the utility model is via the signal input sources of pulse width modulating signal for the promotion loud speaker, and control left otoacoustic emission channel audio and auris dextra channel audio work period at loud speaker via pulse width modulating signal, make when left otoacoustic emission road or auris dextra sound channel when not having audio frequency to import, the power of the unnecessary consumption that under the restriction of work period, avoids waste.In addition, and via pulse width modulating signal itself and produce employed first signal source of this pulse width modulating signal and strengthen left otoacoustic emission road and auris dextra sound channel synchronous character, and reduce noise by this to promote the sound quality of loud speaker output at the audio frequency of loud speaker output.
Description of drawings
Fig. 1 is the schematic diagram of one first embodiment of speaker system provided by the utility model.
Fig. 2 for the current potential in secondary signal source shown in Figure 1 is
During VCC, first comparator shown in Figure 1, second comparator, and the waveform generalized schematic of the square wave of the square wave exported of the output of the 3rd comparator.
Fig. 3 for the current potential in secondary signal source shown in Figure 1 is
During VCC+ Δ VCC, the generalized schematic that each exemplary waveforms of Fig. 2 changes
Fig. 4 for the current potential in secondary signal source shown in Figure 1 is
During VCC-Δ VCC, the generalized schematic that each exemplary waveforms of Fig. 2 changes.
Fig. 5 is the schematic diagram of one second embodiment of speaker system provided by the utility model.
The main element symbol description
100,500 speaker systems
102 first signal sources
104,110,114 comparators
106 secondary signal sources
108,112 audio frequency input sources
116,118 loud speakers
502,504,506 predrive circuits
VO1, VO2, VO3 waveform
Embodiment
In order to overcome the mentioned shortcoming of above-mentioned prior art, therefore the utility model provides a kind of use pulse width modulating signal (Pulse Width Modulation, PWM) speaker system, to save when left otoacoustic emission road or auris dextra sound channel do not have audio frequency to import, continue to promote the power that loud speaker is wasted with source driving signal, and utilize the characteristic of pulse width modulating signal, make the synchronism mass-energy of audio frequency of left otoacoustic emission road that the user hears via loud speaker and auris dextra sound channel enough strengthen and avoid noise.
See also Fig. 1, it is the schematic diagram of one first embodiment of speaker system provided by the utility model.As shown in Figure 1, speaker system 100 comprises one first signal source 102, one first comparator 104, a secondary signal source 106, one first audio frequency input source 108, one second comparator 110, one second audio frequency input source 112, one the 3rd comparator 114, one first loud speaker 116 and one second loud speaker 118.Wherein, first signal source 102 is a sawtooth waveforms (Sawtooth Wave) signal source, and secondary signal source 106 is a direct current signal source.First signal source 102 is connected to the positive input terminal of first comparator 104.First signal source 102 is connected to the positive input terminal of first comparator 104, the positive input terminal of second comparator 110 and the positive input terminal of the 3rd comparator 114.The first audio frequency input source 108 is connected to the negative input end of second comparator 110, is used for importing the audio frequency (R_AUDIO_IN) of auris dextra sound channel.The second audio frequency input source 112 is connected to the negative input end of the 3rd comparator 114, is used for importing the audio frequency (L_AUDIO_IN) in left otoacoustic emission road.The first input end of first loud speaker 116 is connected to the output of first comparator 104, and second input of first loud speaker 116 is connected to the output of second comparator 110.The first input end of second loud speaker 118 is connected to the output of first comparator 104, and second input of second loud speaker 118 is connected to the output of the 3rd comparator 114.
Via first signal source 102 is input into first comparator 104 with secondary signal source 106, pulse width modulating signal results from the output of first comparator 104, and inputs to first loud speaker 116 and second loud speaker 118.As it is known to have the knack of this area person institute, and pulse width modulating signal is the signal waveform of square wave.In like manner, the output of second comparator 110 and the 3rd comparator 114 also can produce the signal waveform of square wave.In addition, the pulse width modulating signal of exporting via the output of first comparator 104 auxiliary also can be finished the function of analogue ground, easily to filter unnecessary noise.The signal of secondary signal source 106 output fixed potentials, the signal that the comparator 104 of winning is exported has periodically.Moreover, because the pulse width modulating signal that the output of first comparator 104 is exported is used for the audio frequency that promotion second comparator 110 and the 3rd comparator 114 are exported in first loud speaker 116 and second loud speaker 118 respectively, therefore can be used to adjust the work period (Duty Cycle) of the audio frequency that the output of first comparator 110 and second comparator 114 exports, make and win audio frequency input source 108 and the second audio frequency input source 112 when not having the audio frequency input, first loud speaker 116 and second loud speaker 118 be subjected to the above-mentioned work period restriction and can consumed power.Moreover, can adjust the work period that pulse width modulating signal limited that first comparator 104 is exported according to the current potential intensity in secondary signal source 106, that is to say, can be according to the needs in different operating cycle, the current potential that changes secondary signal source 106 is
Other values beyond the VCC.See also Fig. 2, Fig. 3, reach Fig. 4.Fig. 2 for the current potential in secondary signal source 106 is
During VCC, the square wave VO2 that the square wave VO1 that the output of first comparator 104 is exported, the output of second comparator 110 are exported, and the waveform generalized schematic of the square wave VO3 that exports of the output of the 3rd comparator 114, and suppose that the first audio frequency input source 108 and the second audio frequency input source 112 continue to have audio frequency input.Fig. 3 for the current potential in secondary signal source 106 is
During VCC+ Δ VCC, the generalized schematic that each exemplary waveforms of Fig. 2 changes.Fig. 4 for the current potential in secondary signal source 106 is
During VCC-Δ VCC, the generalized schematic that each exemplary waveforms of Fig. 2 changes.Note that Δ VCC be one greater than zero and less than
The voltage of VCC.As shown in Figure 2, the work period of square wave VO1 is about 50%.As among Fig. 3 corresponding to oscillogram shown in Figure 2, the current potential that negative input end produced of first comparator 104 increases Δ VCC, promptly the current potential in secondary signal source is
During VCC+ Δ VCC, therefore the current potential of first signal source 102 greater than
The time of VCC will shorten.In other words, the work period of the pulse width modulating signal exported of the output of first comparator 104 also will shorten.Therefore as shown in Figure 3, what the work period of waveform VO1 was more shown in Figure 2 50% must be short, and because waveform VO2 is limited so the work period that also can relatedly dwindle waveform VO2 and VO3 by waveform VO1 with the work period of VO3.In like manner, Fig. 4 corresponding to oscillogram shown in Figure 2 in, it is few that the current potential that negative input end produced of first comparator 104 reduces Δ VCC, promptly the current potential in secondary signal source is
During VCC-Δ VCC, therefore the current potential of first signal source greater than
The time of VCC will increase, and the increase that the work period of the pulse width modulating signal exported of the output of first comparator 104 also can be relative.At last, the work period of waveform VO1, VO2, VO3 all can increase.
Note that above-mentioned following proposition of prerequisite that all continues to be input into the first audio frequency input source 108 and the second audio frequency input source 112 about the narration of Fig. 2 to Fig. 4 based on audio frequency.If audio frequency is desultory when being input into the first audio frequency input source 108 and the second audio frequency input source 112, Fig. 2 also can its level of desultory change to waveform VO2 shown in Figure 4 and VO3, still still can be limited by the illustrated work period among Fig. 2 to Fig. 4.In addition, the speaker system 100 that Fig. 1 proposed is not having audio frequency to be input under the state of the first audio frequency input source 108 or the second audio frequency input source 112, will can not produce redundant power consumption as prior art.Since first signal source 102 input to simultaneously first comparator 104, second comparator 110, with the 3rd comparator 114 in, the problem of audio sync is also solved.
See also the 5th figure, it is the schematic diagram of one second embodiment of speaker system 500 provided by the utility model.One first predrive circuit 502, one second predrive circuit 504 and one the 3rd predrive circuit 506 have also been increased compared to the speaker system 500 shown in speaker system 100, the 5 figure that Fig. 1 proposed.The input of first predrive circuit 502 is connected to the output of first comparator 104, first output of first predrive circuit 502 is connected to first output of first loud speaker 116, and second output of first predrive circuit 502 is connected to first output of second loud speaker 118.First predrive circuit 502 is used for strengthening the pulse width modulating signal that first comparator 104 is exported.The input of second predrive circuit 504 is connected to the output of second comparator 110, and the output of second predrive circuit 504 is connected to second input of first loud speaker 116.Second predrive circuit 504 is used for strengthening the audio frequency that second comparator 110 is exported, that is the audio frequency of the first audio frequency input source 108.The input of the 3rd predrive circuit 506 is connected to the output 114 of the 3rd comparator, and the output of the 3rd predrive circuit 506 is connected to second input of second loud speaker 118.The 3rd predrive circuit 506 is used for strengthening the audio frequency that the 3rd comparator 114 is exported, that is the audio frequency of the second audio frequency input source 112.
Speaker system provided by the utility model is via the signal input sources of pulse width modulating signal for the promotion loud speaker, and control left otoacoustic emission channel audio and auris dextra channel audio work period at loud speaker via pulse width modulating signal, make when left otoacoustic emission road or auris dextra sound channel when not having audio frequency to import, the power of the unnecessary consumption that under the restriction of work period, avoids waste.In addition, and via pulse width modulating signal itself and produce employed first signal source of this pulse width modulating signal and strengthen left otoacoustic emission road and auris dextra sound channel synchronous character, and reduce noise by this to promote the sound quality of loud speaker output at the audio frequency of loud speaker output.Note that in a preferred embodiment of the speaker system that the utility model provides, applied audio frequency amplifier is the D class A amplifier A.
The above only is a preferred embodiment of the present utility model, and all equivalences of being carried out according to the utility model claim change and revise, and all should belong to covering scope of the present utility model.
Claims (5)
1. one kind is used pulse width modulating signal to save the speaker system of power consumption, it is characterized in that comprising:
One first signal source;
One first comparator, its positive input terminal are connected to this first signal source;
One secondary signal source is coupled to the negative input end of this first comparator;
One first audio frequency input source;
One second comparator, its positive input terminal are connected to this first signal source, and negative input end is coupled to this first audio frequency input source;
One second audio frequency input source;
One the 3rd comparator, its positive input terminal are connected to this first signal source, and negative input end is coupled to this second audio frequency input source;
One first loud speaker, its first input end is connected to the output of this first comparator, and second input is connected to the output of this second comparator; And
One second loud speaker, its first input end is connected to the output of this first comparator, and second input is connected to the output of the 3rd comparator.
2. speaker system as claimed in claim 1 is characterized in that also comprising:
One first predrive circuit, its input is connected to the output of this first comparator, and one first output is coupled to the first input end of this first loud speaker, and one second output is coupled to the first input end of this second loud speaker;
One second predrive circuit, its input is connected to the output of this second comparator, and output is connected to second input of this first loud speaker; And
One the 3rd predrive circuit, its input is connected to the output of the 3rd comparator, and output is connected to second input of this second loud speaker.
3. speaker system as claimed in claim 1 is characterized in that, this first signal source is a sawtooth signal source.
4. speaker system as claimed in claim 1 is characterized in that, this secondary signal source is a direct current signal source.
5. speaker system as claimed in claim 4 is characterized in that, the current potential of this dc signal source is to be used for setovering half of direct voltage of this speaker system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201671095U CN201018655Y (en) | 2006-12-01 | 2006-12-01 | Loudspeaker system of using pulsewidth modulation signal to save power consumption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201671095U CN201018655Y (en) | 2006-12-01 | 2006-12-01 | Loudspeaker system of using pulsewidth modulation signal to save power consumption |
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| Publication Number | Publication Date |
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| CN201018655Y true CN201018655Y (en) | 2008-02-06 |
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| CNU2006201671095U Expired - Fee Related CN201018655Y (en) | 2006-12-01 | 2006-12-01 | Loudspeaker system of using pulsewidth modulation signal to save power consumption |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101729030B (en) * | 2008-10-20 | 2013-09-11 | 立锜科技股份有限公司 | D class amplifier and control method thereof |
| CN103733642B (en) * | 2011-08-12 | 2016-12-14 | 株式会社特瑞君思半导体 | Drive circuit |
-
2006
- 2006-12-01 CN CNU2006201671095U patent/CN201018655Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101729030B (en) * | 2008-10-20 | 2013-09-11 | 立锜科技股份有限公司 | D class amplifier and control method thereof |
| CN103733642B (en) * | 2011-08-12 | 2016-12-14 | 株式会社特瑞君思半导体 | Drive circuit |
| US9641931B2 (en) | 2011-08-12 | 2017-05-02 | Trigence Semiconductor, Inc. | Drive circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080206 Termination date: 20131201 |