CN102932713B - Signal processing device - Google Patents
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- CN102932713B CN102932713B CN201110228939.XA CN201110228939A CN102932713B CN 102932713 B CN102932713 B CN 102932713B CN 201110228939 A CN201110228939 A CN 201110228939A CN 102932713 B CN102932713 B CN 102932713B
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Abstract
The invention provides a signal processing device which is used for receiving a noise signal and generating a noise elimination signal. The signal processing device comprises an inverting circuit and a selection circuit, wherein the inverting circuit is used for inverting a first signal to generate a first inverting signal; and the selection circuit is coupled with the inverting circuit and used for selecting one of the first signal and the first inverting signal as an output signal.
Description
Technical field
The present invention relates to signal transacting, especially relate to a kind of in order to carry out the signal processing apparatus of active noise control (active noise control).
Background technology
Active noise controls (active noise control, ANC) main concept be according to the noise source in environment produce haply for an anti-phase anti-noise (in fact, only may comprise the low frequency part of this noise source), its amplitude size is roughly the same with this noise source, and phase place is contrary, and utilize the overlaying feature of sound wave, make anti-noise and this noise source produce destruction interference mutually, suppress noise.This technology is widely used for the public address sets such as earphone usually, it, when user listens to the source of sound that public address set plays, utilizes public address set to play anti-noise (by the message signale corresponding to this source of sound and the noise erasure signal corresponding to anti-noise are carried out audio mixing) simultaneously.Thus, user, when being listened to this source of sound by public address set, just not easily perceives the existence of this noise source, listens to quality and thus obtains lifting.Traditionally, this active noise control technology be applied in public address system can realize by circuit as shown in Figure 1.
Fig. 1 shows a kind of known noise absorber, wherein includes acoustic-electric conversion equipment 11 (as: microphone), analog-to-digital converter 12, filter circuit 13 and digital to analog converter 14.Acoustic-electric conversion equipment 11 in order to record the noise source in environment, and utilizes piezoelectric effect to produce the man made noise signal of an electronization, then, by analog-to-digital converter 12, this man made noise signal is converted to a digital noise signal.This digital noise signal can be sent to filter circuit 13, transfer function between this noise source of its Main Basis and the actual noise sound wave listened to of user, filtering process is carried out to this digital noise signal, to produce the noise erasure signal this noise source being had to the effect of destruction interference.The output of filter circuit 13 may again through a digital to analog converter 14 to convert thereof into an analog signal.This analog signal can by an electro-acoustic conversion device 15 to produce a man made noise erasure signal, and this man made noise erasure signal can be mixed with the message signale for playing by a mixer 16.Through such process, user, when listening to this message signale, is just not easy the noise source experienced in background.
But the noise absorber of this framework may run into some problems in circuit design.For example, sometimes in order to the characteristic in response to circuit is considered (as: gain), this analog signal actual be admitted to electro-acoustic conversion device 15 or mixer 16 before, may amplifying circuit (not shown) first more than one-level, and may be anti-phase amplification, and such signal processing mode may cause anti-phase through twice of this man made noise erasure signal, and form the man made noise erasure signal that has Constructive interaction, the noise sound wave may listened to user is produced Constructive interaction.Because the effect that this man made noise erasure signal is main is that the noise sound wave may listened to user produces destruction interference.Thus, known noise absorber just loses the noise rejection effect originally can reached.
Summary of the invention
In view of this, the invention provides a kind of foundation active noise and control (active noise control) principle to carry out the signal processing apparatus of noise elimination.Wherein, signal processing apparatus of the present invention optionally determine the polarity of its noise erasure signal exported solve known technology the problem that faces.Signal processing apparatus of the present invention is reached mainly through extra negative circuit and selection circuit.Design according to different back-end circuit, signal processing apparatus of the present invention output one can be selected anti-phase noise erasure signal (that is, with noise sound wave homophase haply) or a noninverting noise erasure signal (that is, anti-phase haply with noise sound wave).In brief, even if under the back-end circuit coupled at signal processing apparatus of the present invention has carried out anti-phase amplification situation to noise erasure signal, all by anti-phase/noninverting signal noise erasure signal that signal processing apparatus of the present invention provides, guarantee to carry out destruction interference to noise sound wave, to reach the effect of noise suppression.
One embodiment of the invention provide a kind of signal processing apparatus, and it is used for reception one noise signal produce a noise erasure signal.This signal processing apparatus comprises a negative circuit and a selection circuit.This negative circuit is in order to carry out an anti-phase process to produce anti-phase first signal to one first signal.This selection circuit couples this negative circuit, and this selection circuit selects one using as an output signal in this first signal and this anti-phase first signal.
In an example in this embodiment, this signal processing apparatus separately comprises a filter circuit, and couples this selection circuit, and this filter circuit carries out a filtering process to produce this noise erasure signal to this output signal, and wherein this first signal is this noise signal.
In another example in this embodiment, this signal processing apparatus separately comprises a filter circuit, and this filter circuit couples this negative circuit, and this filter circuit carries out a filtering process to produce this first signal to this noise signal.
Another embodiment of the present invention provides a kind of signal processing apparatus, and it is used for reception one noise signal produce a noise erasure signal, and this signal processing apparatus comprises a negative circuit, a filter circuit and a selection circuit.This negative circuit is in order to carry out an anti-phase process to produce an anti-phase noise signal to this noise signal.This filter circuit couples this negative circuit, and this filter circuit carries out a filtering process to this noise signal and this anti-phase noise signal, to produce after a filtering anti-phase noise signal after noise signal and a filtering.This selection circuit couples this filter circuit, and this selection circuit selects one using as this noise erasure signal after this filtering in anti-phase noise signal after noise signal and this filtering.
Accompanying drawing explanation
Fig. 1 illustrates a kind of known noise absorber.
Fig. 2 illustrates the function block schematic diagram of the first embodiment of signal processing apparatus of the present invention.
Fig. 3 illustrates the function block schematic diagram of the second embodiment of signal processing apparatus of the present invention.
Fig. 4 illustrates the function block schematic diagram of the 3rd embodiment of signal processing apparatus of the present invention.
Fig. 5 illustrates the function block schematic diagram of the embodiment of negative circuit in signal processing apparatus of the present invention.
Fig. 6 illustrates the function block schematic diagram of the 4th embodiment of signal processing apparatus of the present invention.
Fig. 7 illustrates the function block schematic diagram of the 5th embodiment of signal processing apparatus of the present invention.
Fig. 8 illustrates the function block schematic diagram of an embodiment of evaluation circuits in signal processing apparatus of the present invention.
Fig. 9 illustrates an embodiment of the control flow of signal processing apparatus of the present invention.
Figure 10 illustrates another embodiment of the control flow of signal processing apparatus of the present invention.
Primary clustering symbol description
11 acoustic-electric conversion equipments
12 analog-to-digital converters
13,220,330,410,620,720 filter circuits
14 digital to analog converters
15 electro-acoustic conversion devices
16 mixers
200,300,400,600,700 signal processing apparatus
210,310,420,610,710 negative circuits
230,320,430,630,730 selection circuits
A, B end points
640,740 switching circuits
650,750 evaluation circuits
810 absolute value circuits
820 filters
830 ON-OFF control circuit
Embodiment
Concept of the present invention will be described in conjunction with different embodiment and relevant indicators below, and different technologies feature mentioned in different embodiment in literary composition, be not limited in this embodiment and implement.In fact, in reasonable category of the present invention, by the suitable amendment to certain embodiment, possesses technical characteristic specific to other embodiment to make it.
Signal processing apparatus of the present invention includes the assemblies such as a negative circuit, a filter circuit and a selection circuit, and in order to receive a noise signal and to produce a noise erasure signal.The function of this filter circuit is mainly used to produce a noise erasure signal (but haply for anti-phase) similar to the noise in environment, negative circuit is the main signal in order to produce another group with opposed polarity then, and decide to export anti-phase or noninverting noise erasure signal by selection circuit actually, wherein, selection circuit can change the polarity of the signal that it exports according to different circuit design demands.In different embodiments of the invention, this negative circuit, this filter circuit and this selection circuit have different annexations.But finally all can reach identical technique effect, details are as follows.
First, in the first embodiment shown in Fig. 2, signal processing apparatus 200 receives a noise signal and produces a noise erasure signal, wherein, the man made noise signal that this noise signal may produce according to the noise source in environment for an acoustic-electric conversion equipment (not shown), or the digital noise signal changed by an analog-to-digital converter (not shown) more further and produce, this noise erasure signal (also may be numeral or simulation) is then in order to export a back-end circuit (as: power amplification circuit to, electroacoustic change-over circuit and mixer) with a public address set (as: loudspeaker and earphone) in play, and then noise suppression is carried out to this noise source.The arrangement of components of signal processing apparatus 200 is as follows with annexation wherein: negative circuit 210 in order to receive this noise signal, and carries out an anti-phase process to this noise signal, to produce an anti-phase noise signal.Filter circuit 220 is coupled to negative circuit 210, and in order to receive this noise signal and this anti-phase noise signal, to carry out a filtering process to this noise signal and this anti-phase noise signal, to produce after a filtering anti-phase noise signal after noise signal and a filtering according to this.Selection circuit 230 is coupled to filter circuit 220, and in order to select one to be used as an output signal in anti-phase noise signal after noise signal after this filtering and this filtering, wherein this output signal is this noise erasure signal that signal processing apparatus 200 produces.Outline, in the present embodiment, negative circuit 210 first produces an anti-phase signal according to this noise signal, and filter circuit 220 then carries out filtering process to this inversion signal and this noise signal be not inverted, finally in the output of filter circuit 220, one is selected to be used as this noise erasure signal by selection circuit 230 again.When back-end circuit causes anti-phase amplification to signal in fact, then selection circuit 230 can be selected to export anti-phase noise erasure signal; Otherwise, then can select to export noninverting noise erasure signal.
Secondly disclose the another kind of circuit based on concept of the present invention in the second embodiment shown in Fig. 3 and implement change.As shown in the figure, signal processing apparatus 300 has following arrangement of components and assembly annexation: negative circuit 310 in order to receive this noise signal, and carries out an anti-phase process to this noise signal, to produce an anti-phase noise signal.Selection circuit 320 is coupled to negative circuit 310, and in order to select one as an output signal in this noise signal and this anti-phase noise signal.Filter circuit 330 is coupled to selection circuit 320, and in order to receive this output signal, and then a filtering process is carried out to produce this noise erasure signal to this output signal.Outline, in the present embodiment, the operation of signal behavior prior to signal filtering operation and carry out.In other words, in the present embodiment, filter circuit 330 only needs to carry out filtering operation to a signal, therefore can reduce the circuit complexity of filter circuit 330.
Finally, the 3rd embodiment representated by Fig. 4 is also that another kind of circuit of the present invention implements change.As shown in the figure, the arrangement of components of signal processing apparatus 400 correspondence is as follows with annexation wherein: filter circuit 410 in order to receive this noise signal, and carries out a filtering process to produce noise signal after a filtering to this noise signal.Negative circuit 420 is coupled to filter circuit 410, and in order to receive noise signal after this filtering, and carries out an anti-phase process to produce noise signal after an anti-phase filtering to noise signal after this filtering.Selection circuit 430 is coupled to negative circuit 420 and filter circuit 410, in order to receive after this anti-phase filtering noise signal after noise signal and this filtering respectively, and selects one of them person as this noise erasure signal.As from the foregoing, although different embodiments of the invention provide different assembly annexation changes, this change all can reach identical technique effect, even provides the selection in more designs.
Moreover, only mention negative circuit, filter circuit and selection circuit for the description of the intraware of signal processing apparatus no doubt.But, in other possibility embodiment of the present invention, signal processing apparatus separately includes other extra circuit unit, it may be coupled in negative circuit, filter circuit and selection circuit appoints between the two, or be coupled to signal processing apparatus input (that is terminal A) and graphic in first assembly (assembly 210,310 and 410) between, or even be coupled to signal processing apparatus output (that is terminal B) and graphic in the 3rd assembly (assembly 230,330 and 430) between.Because these extra circuit units can't affect running and the function of negative circuit, filter circuit and selection circuit, thus belong to category of the present invention far and away.
The negative circuit of signal processing apparatus of the present invention also has multiple possible design alternative on the implementation.For example, when the first signal that negative circuit receives is for having the digital signal of at least one position (as: n position), then negative circuit of the present invention may include at least one inverted logic door (NOT door), and in order to carry out anti-phase process to this at least one position of this first signal, and produce this anti-phase first signal according to a result of this anti-phase process.In addition, if the first signal represents the information of 2 complement codes (such as, first signal is by pulse code modulation (pulse coded modulation, PCM) information that form is encoded) time, because now this first signal will be two complement codes, therefore in aforesaid design, an adder need be added, and utilize this adder to carry out add operation to the output of inverted logic door and a binary value 1, could really reach anti-phase effect.About above describe corresponding graphic can with reference to figure 5.In addition, negative circuit of the present invention also can be realized by an all-pass filter; Or when noise signal is cyclical signal, can be produced specific time of delay (as: half in primary signal cycle) by a delay circuit, cause the phase difference having 180 degree between output signal with input signal, to reach anti-phase effect.It can thus be appreciated that negative circuit of the present invention can be realized by any circuit reaching anti-phase effect.
In addition, in other embodiments of the present invention, for comfort level when user listens to can be promoted, the present invention adds evaluation mechanism in addition, it is in order to assess the correlation energy of noise signal, to avoid noise erasure signal individualism, and then the negative pressure produced when playing this noise erasure signal is caused to bring user sense of discomfort.Principle that this mechanism judges avoids noise erasure signal individualism or too obvious.For example, user is after the public address set opening tool the technology of the present invention effect, if when there is faint noise source in environment, acoustic-electric conversion equipment can produce noise signal according to this.Concerning normal user, the noise of this degree is not easy to discover really, if but by the broadcasting of public address set, the negative pressure that this anti-phase noise produces may quite obviously (if can be more obvious when normal source of sound do not play by public address set simultaneously), cause the sense of discomfort of user, therefore for avoiding this phenomenon, evaluation mechanism of the present invention can be avoided exporting this noise erasure signal to back-end circuit, or does not accept noise signal to avoid to produce this noise erasure signal.About further details, ask for an interview the 4th and the 5th following embodiment.
Fig. 6 shows the 4th embodiment of signal processing apparatus of the present invention, wherein signal processing apparatus 600 (may be implemented with arbitrary circuit framework in the first to the 3rd embodiment) except including negative circuit 610, filter circuit 620 and selection circuit 630, also comprises switching circuit 640 and an evaluation circuits 650 in addition.Wherein, switching circuit 640 is arranged on the importation of signal processing apparatus, and in order to control the reception of this noise signal, and then the generation determining this noise erasure signal whether.Evaluation circuits 650 is in order to assess the energy value corresponding to this noise signal (may be numeral or the noise signal of simulating pattern), and carry out control switch circuit 640 according to this energy value, and when being not more than a predetermined value when this energy value (now noise is not easy to be found by user), evaluation circuits 650 is by control switch circuit 640, with cause this noise signal not receive by signal processing apparatus 600 (causing noise erasure signal to be produced), and (represent noise obvious when this energy value is greater than this predetermined value, there is the necessity of carrying out active noise control), then evaluation circuits 650 by control switch circuit 640 with make this noise signal can receive by signal processing apparatus 600 (and then producing this noise erasure signal).Above design in certain circumstances, can avoid the generation of this noise erasure signal, to promote the comfort level of user.
Fig. 7 shows the 5th embodiment of signal processing apparatus of the present invention, and it is the another kind of improvement mode promoting user's comfort level.Wherein, signal processing apparatus 700, except including negative circuit 710, filter circuit 720 and selection circuit 730 (may implement with arbitrary circuit framework in the first to the 3rd embodiment), also separately comprises switching circuit 740 and an evaluation circuits 750.Wherein, be arranged on the output of signal processing circuit with switching circuit 750, to control the output of this noise erasure signal.Evaluation circuits 750 in order to assess the energy value corresponding to an input signal (may be the input signal of analog or digital form), and controls this switching circuit 740 according to this energy value.This input signal mainly may produce based on this noise signal, or based on this noise erasure signal, or even for the mixed signal (produced by mixer 770) of the normal message signale play and this noise erasure signal.When this energy value is not more than a predetermined value (noise is not easily found by user), then evaluation circuits 750 is by control switch circuit 740, with cause this noise erasure signal not export by this signal processing apparatus 700, and when this energy value is greater than this predetermined value, then evaluation circuits 750 control switch circuit 740, with cause this noise erasure signal can export by signal processing apparatus 700.Similarly, above design still under some specific feelings, can avoid the output of this noise erasure signal.In addition, the evaluation circuits 750 of the present embodiment can carry out control switch circuit 740 according to the input signal that multiple difference is possible, provide more thorough evaluation mechanism.General, be input to evaluation circuits 750 for reference come the signal of control switch circuit 740 may include: noise signal, filtered noise signal, the output signal of signal processing apparatus and/or the output signal of signal processing apparatus and the mixed mixed signal of a message signale.
Evaluation circuits 650 and 750 can utilize in multiple different circuit framework and be implemented.Please refer to Fig. 8, it represents a kind of possible example.Wherein, evaluation circuits 800 includes absolute value circuit 810, filter 820 and an ON-OFF control circuit 830.Absolute value circuit 810 is in order to receive and to process this noise signal (or this noise erasure signal and this mixed signal), and 820, filter produces this energy value corresponding to this noise signal (or this noise erasure signal and this mixed signal) according to the output of absolute value circuit 810.ON-OFF control circuit 830 will produce a switch controlling signal to switching circuit 640 or 740 according to this energy value.In addition, except above mode, absolute value circuit 810 also can use a Peak current to reach same technique effect.
Above embodiment discloses evaluation circuits 650 and 750 can according to this noise signal, this noise erasure signal or this mixed signal, distinguish control switch circuit 640 and 740, and then change the signal path of signal processing apparatus 600 and 700, with the generation of control noise erasure signal/whether export.But, in another embodiment of the invention, by by directly close or start signal processing unit 600 to 700 to reach similar effect.In the middle of, a kind of possible execution mode is the power supply supply of control signal processing unit 600 and 700, by providing or remove the power supply supply of signal processing apparatus 600 and 700, and then the generation of control noise erasure signal/whether export.In addition, in other possibility execution mode, also carry out the running of control signal processing unit 600 and 700 internal circuit unit by enable signal, reach identical effect.By closing or the running of start signal processing unit 600 and 700, the power loss of signal processing apparatus 600 and 700 can be reduced further, reach the effect of power saving.
Please refer to Fig. 9, it illustrates that one of the control flow of signal processing apparatus of the present invention may embodiment.As shown in the figure, in step 910, this evaluation circuits in signal processing apparatus of the present invention carries out the assessment of signal energy value to a signal.In the middle of, this signal that this evaluation circuits is assessed may at least one in noise signal, noise erasure signal and mixed signal.Then, in step 920, this evaluation circuits judges whether that an energy value of this signal is less than a predetermined value, and it should be noted that the difference of this signal assessed along with this evaluation circuits, this predetermined value is also different.When this energy value is less than this predetermined value, step 922 can be entered, check whether that noise elimination function is opened, wherein, the unlatching of noise elimination function may represent the power supply supply unlatching of this signal processing apparatus widely, or represent the opening of this switching circuit, make the internal signal transmission path of this signal processing apparatus that this signal processing apparatus can be caused to produce/export this noise erasure signal.If the judged result of step 922 is yes, then return step 910, again this signal is assessed.And if the judgement of step 922 points out that noise elimination function is not yet closed, then step 924 can be entered, further the power supply being supplied to this signal processing apparatus is removed, or change signal transmission path by controlling this switching circuit, cannot produce/export this noise erasure signal to make this signal processing apparatus.In addition, if the result of step 920 enters step 924, then can check whether that noise elimination function is closed, wherein, the closedown of noise elimination function may represent the power supply supply closedown of this signal processing apparatus widely, or represent the closed condition of this switching circuit, make the internal signal transmission path of this signal processing apparatus that this signal processing apparatus cannot be caused to produce/export this noise erasure signal.If the judged result of step 924 is yes, then return step 910, again this signal is assessed.And if the judgement of step 924 points out that noise elimination function is not opened, then step 934 can be entered, power supply will be supplied further to this signal processing apparatus, or change signal transmission path by controlling this switching circuit, can produce/export this noise erasure signal to make this signal processing apparatus.
Opening or closing in the process of noise elimination function, in order to avoid the moment of opening or close produces bruit de craquement, therefore, in one embodiment of this invention, the opportunity of opening or closing noise elimination function can be decided according to the amplitude of an output signal (such as, noise erasure signal) of this signal processing apparatus.Only when the amplitude of this output signal is enough low, just can open or close noise elimination function outright (such as; The change of being supplied by power supply or the change by signal transmission path), whether change the generation of this output signal.But if when the amplitude of this output signal is enough not low, the present invention can't open outright or close noise elimination function, but after the amplitude of this output signal is positioned at enough low degree by the time, just open or close noise elimination function.By above execution mode, the chance that bruit de craquement produces can be reduced, avoid the discomfort that user listens to.
Please refer to Figure 10, it illustrates another possibility embodiment of the control flow of signal processing apparatus of the present invention.Wherein, be with the difference of the embodiment representated by Fig. 9, step 1032 in the present embodiment can't as the step 932 in the embodiment of Fig. 9, direct closedown noise elimination function, but the volume of this noise erasure signal can be downgraded progressively, to reach the effect of diminuendo (fade out), similarly, in step 1034, signal processing apparatus of the present invention can improve the volume of this noise erasure signal progressively, to reach the effect of crescendo (fade in), provide that user is finer listens to impression thus.
Should be noted that, although comprise the different technical characteristic of the present invention in above different embodiment, but, technical characteristic in these different embodiments, by the design variation of the circuit framework to signal processing apparatus of the present invention, and be side by side implemented, and such design variation, reasonable category of the present invention should be belonged to.
In summary, signal processing apparatus of the present invention provides multiple different example to reach the effect of noise suppression, and can avoid because circuit design is improper the unintended Constructive interaction that noise sound wave causes.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the claims in the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (15)
1. a signal processing apparatus, is used for reception one noise signal produce a noise erasure signal, and described signal processing apparatus comprises:
One negative circuit, in order to carry out an anti-phase process to produce anti-phase first signal to one first signal; And
One selection circuit, couples described negative circuit, and described selection circuit selects one using as an output signal in described first signal and described anti-phase first signal, and described signal processing apparatus also comprises:
One switching circuit, couple described negative circuit and described selection circuit, described switching circuit controls the operation of described signal processing apparatus; And
One evaluation circuits, couples described switching circuit, and described evaluation circuits in order to assess the energy value corresponding to described first signal, and controls described switching circuit according to described energy value.
2. signal processing apparatus according to claim 1, also comprise a filter circuit, and couple described selection circuit, described filter circuit carries out a filtering process to produce described noise erasure signal to described output signal, wherein, described first signal is described noise signal.
3. signal processing apparatus according to claim 1, also comprises a filter circuit, and described filter circuit couples described negative circuit, and described filter circuit carries out a filtering process to produce described first signal to described noise signal.
4. signal processing apparatus according to claim 1, wherein, described first signal is have the digital signal of at least one, and described negative circuit includes at least one inverted logic door and NOT door, and in order to carry out anti-phase process to described at least one position of described first signal, and produce described anti-phase first signal according to a result of described anti-phase process.
5. signal processing apparatus according to claim 4, wherein, described negative circuit also includes an adder, and described adder is in order to be added described result with binary one, and then produces described anti-phase first signal.
6. signal processing apparatus according to claim 1, wherein said negative circuit includes an all-pass filter, and described negative circuit carries out a filtering process to produce described anti-phase first signal by described all-pass filter to described first signal.
7. signal processing apparatus according to claim 1, wherein, described negative circuit includes a delay circuit, and described negative circuit carries out a delay disposal to produce described anti-phase first signal by described delay circuit to described first signal, and described first signal is a cyclical signal.
8. signal processing apparatus according to claim 1, wherein, when described energy value is not more than a predetermined value, then described evaluation circuits control described switching circuit with make described output signal not export by described signal processing apparatus, and when described energy value is greater than described predetermined value, then described evaluation circuits control described switching circuit with make described output signal export by described signal processing apparatus.
9. signal processing apparatus according to claim 1, wherein, described evaluation circuits includes an absolute value circuit, a filter and an ON-OFF control circuit, described absolute value circuit receives and processes input signal, described filter exports the described energy value corresponding to described input signal according to the output of described absolute value circuit, and described ON-OFF control circuit produces a switch controlling signal to described switching circuit according to described energy value.
10. signal processing apparatus according to claim 1, wherein, described evaluation circuits includes a Peak current, a filter and an ON-OFF control circuit, described Peak current receives and processes input signal, described filter exports the described energy value corresponding to described input signal according to the output of described Peak current, and described ON-OFF control circuit produces a switch controlling signal to described switching circuit according to described energy value.
11. signal processing apparatus according to claim 1, wherein, when described energy value is not more than a predetermined value, then described evaluation circuits closes described signal processing apparatus, described signal processing apparatus is made not produce described output signal, and when described energy value is greater than described predetermined value, then described evaluation circuits opens described signal processing apparatus, described signal processing apparatus is made to produce described output signal.
12. signal processing apparatus according to claim 1, wherein, described evaluation circuits also according to the amplitude size corresponding to described output signal whether be less than a reference amplitude determine whether at once according to described energy value to control the operation of described signal processing apparatus; If so, then described evaluation circuits controls the operation of described signal processing apparatus at once according to described energy value; If not, then described evaluation circuits waits for that described amplitude size is lower than after described reference amplitude, just can control the operation of described signal processing apparatus according to described energy value.
13. signal processing apparatus according to claim 1, it also comprises:
One switching circuit, couple described negative circuit and described selection circuit, described switching circuit controls the operation of described signal processing apparatus; And
One evaluation circuits, couples described switching circuit, and described evaluation circuits in order to assess the energy value corresponding to described output signal, and controls described switching circuit according to described energy value.
14. signal processing apparatus according to claim 1, it also comprises:
One switching circuit, couple described negative circuit and described selection circuit, described switching circuit controls the operation of described signal processing apparatus; And
One evaluation circuits, couples described switching circuit, described evaluation circuits in order to assess described output signal and a message signale a mixed signal corresponding to an energy value, and control described switching circuit according to described energy value.
15. 1 kinds of signal processing apparatus, are used for reception one noise signal produce a noise erasure signal, and described signal processing apparatus comprises:
One negative circuit, in order to carry out an anti-phase process to produce an anti-phase noise signal to described noise signal;
One filter circuit, couples described negative circuit, and described filter circuit carries out a filtering process to described noise signal and described anti-phase noise signal, to produce after a filtering anti-phase noise signal after noise signal and a filtering; And
One selection circuit, couples described filter circuit, and described selection circuit selects one using as described noise erasure signal after described filtering in anti-phase noise signal after noise signal and described filtering.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1684189A (en) * | 2004-04-12 | 2005-10-19 | 索尼株式会社 | Method of and apparatus for reducing noise |
| CN101001481A (en) * | 2006-01-14 | 2007-07-18 | 三星电子株式会社 | Apparatus and method of reducing noise of earphones, noise reducing earphones, and a portable audio reproducing apparatus |
| CN201054780Y (en) * | 2007-06-05 | 2008-04-30 | 炬力集成电路设计有限公司 | Automatic noise reduction earphone |
| JP2010050739A (en) * | 2008-08-21 | 2010-03-04 | Audio Technica Corp | Noise-canceling system |
-
2011
- 2011-08-10 CN CN201110228939.XA patent/CN102932713B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1684189A (en) * | 2004-04-12 | 2005-10-19 | 索尼株式会社 | Method of and apparatus for reducing noise |
| CN101001481A (en) * | 2006-01-14 | 2007-07-18 | 三星电子株式会社 | Apparatus and method of reducing noise of earphones, noise reducing earphones, and a portable audio reproducing apparatus |
| CN201054780Y (en) * | 2007-06-05 | 2008-04-30 | 炬力集成电路设计有限公司 | Automatic noise reduction earphone |
| JP2010050739A (en) * | 2008-08-21 | 2010-03-04 | Audio Technica Corp | Noise-canceling system |
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