CN102802102A - Distortionless sound playback system for counter electromotive force signals - Google Patents
Distortionless sound playback system for counter electromotive force signals Download PDFInfo
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- CN102802102A CN102802102A CN2011101363742A CN201110136374A CN102802102A CN 102802102 A CN102802102 A CN 102802102A CN 2011101363742 A CN2011101363742 A CN 2011101363742A CN 201110136374 A CN201110136374 A CN 201110136374A CN 102802102 A CN102802102 A CN 102802102A
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Abstract
The invention discloses a distortionless sound playback system for counter electromotive force signals. The distortionless sound playback system is characterized by comprising a counter electromotive force signal loudspeaker and a counter electromotive force signal amplifier, wherein when the loudspeaker body is distorted, and the motion speed of a paper disk is deviated from a desired value under the pressure of air in a sound box or the influence of sound reflection, resonance, standing waves and harmonic factors, a sound coil in the counter electromotive force signal loudspeaker, which is connected with the paper disk, can instantly detect the generated deviation and feed back the deviation to the counter electromotive force signal amplifier; and the counter electromotive force signal amplifier instantly makes a response to rectify the deviation until the deviation completely disappears. The distortionless sound playback system is rational in design; the loudspeaker is changed into a standard four-end network provided with an input and an output; and moreover, an output signal can really reflect an electric signal of the motion of the loudspeaker, so that a power amplifier and the loudspeaker belong to a real electronic network system. The frequency response is wide and flat, and the sound is not subjected to distortion and phase shift; the counter electromotive force signal loudspeaker can replace all treble, alto and bass loudspeakers in the sound box; and therefore, the step of adjusting the troublesome frequency divider is omitted, and the manufacturing cost of the sound box is greatly reduced.
Description
Technical field
The present invention relates to a kind of sound system, the undistorted sound equipment playback system of particularly a kind of back-emf signal.
Background technology
Present sound equipment playback system comprises three parts: prime, back level and loud speaker, and prime often lumps together with the back level, is called the merging machine, and no matter level is closed and is not conformed to after the prime, and loud speaker is then always independently.Sound equipment power amplifier manufacturer is concerned about is the indexs such as power, the distortion factor, frequency response of amplifier, is bad then less concern as for the working condition of loud speaker.
Although power amplifier and loud speaker are with being called a sound system, they are not electronic network systems truly.Be not difficult to find out that the output of power amplifier connects loud speaker through a pair of line, loud speaker is because of the vibration sounding, obviously, loud speaker sounding what state, system is entirely ignorant of, certainly with regard to let alone sound revised.The distortion factor of power amplifier can reach 0.01% in addition, and the distortion factor of loud speaker has only 3-5%, and can reach 1% has been very amazing, and both differ and reach two one magnitude unexpectedly.No wonder people focus on attentiveness on one's body the loud speaker! Here have very big mistaken ideas in fact: loudspeaker distortions is big, and this no doubt is a fact, is not only to go from the single aspect of loud speaker to consider but address this problem.See from network theory; Loud speaker has only input and no-output (signal of telecommunication) is the four-terminal network of one-port rather than a standard, if loud speaker changed into the four-terminal network of a standard; Existing input also has output; And the signal of output can truly reflect the signal of telecommunication of loudspeaker movements, and this moment, power amplifier and loud speaker just can belong to together at an electronic network system truly, and the distortion of loud speaker is expected to be resolved so.
Last century the nineties, sound equipment circle once proposed one and was referred to as " motional feedback system ".Its operation principle is probably following: install a microphone additional in the loud speaker front, the sounding situation of picking up loud speaker transfers to and feeds back to system behind the signal of telecommunication and revise.Obviously the imagination of " motional feedback system " is very perfect, and it links electronic network system of formation to power amplifier and loud speaker through microphone, and purpose is exactly to want to solve through system the distortion of loud speaker.
But " motional feedback system " implements but very difficulty, just not saying the quality requirement of microphone is quite high; But also to carry out undistorted amplification to the signal that microphone obtains; Otherwise the distortion of microphone and narrower frequency response are brought into system, cause new distortion.The placement location of microphone is just very troubling.People's nature is invested loud speaker to sight: simply install to microphone in the loud speaker.So just design what is called " moving feedback speaker ".But, no matter be " motional feedback system ", " moving feedback speaker " might as well; All use and install this notion of microphone additional and realize; Naturally bring install microphone additional and cause cover disease, add because the influence of all other factors in fact always can not reach expected result.This can't but be very big regretting just because of this reason up to so far, does not just have this system or loud speaker to occur in the market at all!
Summary of the invention
The object of the present invention is to provide a kind of reasonable in design; Loud speaker is changed into the four-terminal network of a standard; Existing input also has output; And the signal of output can truly reflect and the signal of telecommunication of loudspeaker movements together power amplifier and loud speaker are belonged at an electronic network system truly, and by the rectify a deviation undistorted sound equipment playback system of back-emf signal of processing of back-emf signal amplifier.
The object of the invention can reach through following measure: a kind of back-emf signal is undistorted sound equipment playback system; It is characterized in that: comprise back-emf signal loud speaker, back-emf signal amplifier; When the distortion of loud speaker own and paper disc movement velocity receive the influence of air compressing in the audio amplifier or sound reflection, resonance, standing wave, harmonic factor and squint desired value; The voice coil loudspeaker voice coil that links to each other with paper disc in the back-emf signal loud speaker detects the deviation of generation immediately, and deviation is fed back to the back-emf signal amplifier, and the back-emf signal amplifier produces response immediately; The processing of rectifying a deviation is till the deviation complete obiteration.
The object of the invention can also reach through following measure: the voice coil loudspeaker voice coil in the said back-emf signal loud speaker can be considered the K+1 section that effective length equates, beginning from voice coil loudspeaker voice coil end of the same name is the 1st section, up to K-1, K, K+1 section; Arriving the voice coil loudspeaker voice coil non-same polarity again finishes; Between K-1 section and K section, draw tap and make output, the K+1 section is separated with the voice coil loudspeaker voice coil of motion, change on the soft iron that is fixed on magnetic conduction in the loud speaker; Do not participate in the motion of voice coil loudspeaker voice coil, and with its reversal connection.Voice coil loudspeaker voice coil in the said back-emf signal loud speaker can be divided into two groups of parallel connections; Two groups all is to the K section from the 1st section; Two groups of direction of windings are identical; Draw tap between every group of K-1 section and the K section and make output, and wherein one group K section changes on the soft iron that is fixed on magnetic conduction in the loud speaker, does not participate in the motion of voice coil loudspeaker voice coil.Voice coil loudspeaker voice coil in the said back-emf signal loud speaker can be considered the K section that effective length equates, beginning from voice coil loudspeaker voice coil end of the same name is the 1st section, up to K-1, K section; Arrive the voice coil loudspeaker voice coil non-same polarity again and finish, between K-1 section and K section, draw tap and make output, the K section is separated with the voice coil loudspeaker voice coil of motion; Change on the soft iron that is fixed on magnetic conduction in the loud speaker; Do not participate in the motion of voice coil loudspeaker voice coil, and with its reversal connection, other is at two divider resistances of input termination of back-emf signal loud speaker; Total output voltage values U is made K/dividing potential drop, again and the absolute value of voltage of drawing output between K-1 section and the K section subtract each other..
. present technique has following advantage:
1, system's playback frequency response is wide and flat, and sound is undistorted, no phase shift.In other words, sound reproduction reaches suitable ideal state.
2, so wide frequency response is arranged, an available back-emf signal loud speaker substitutes all high, normal, basic loud speakers in the audio amplifier, has also saved the frequency divider of adjustment trouble, reduces the audio amplifier manufacturing cost greatly.
3, audio amplifier is a quite complicated sound system, design a perfect audio amplifier and be not easy really.But with perfect audio amplifier of back-emf signal loudspeaker design is not a difficult matter.Its reason is: when the distortion of loud speaker own and cone movement velocity receive air compressing or sound reflection in the audio amplifier, resonance, standing wave; The influence of harmonic wave or the like factor and when squinting desired value; The voice coil loudspeaker voice coil that links to each other with cone in the back-emf signal loud speaker detects the deviation of generation immediately, and deviation is passed to the back-emf signal amplifier, and the back-emf signal amplifier produces response immediately; The processing of rectifying a deviation is till the deviation complete obiteration.Correction required time extremely short (whole process is a negative feedback process).See that from the network analysis angle native system is not only included loud speaker, still included audio amplifier, so loudspeaker distortions can eliminate, the distortion that audio amplifier causes can be eliminated equally.
Description of drawings
Fig. 1 is a circuit block diagram of the present invention;
Fig. 2～Fig. 4 is the circuit theory winding diagram of three embodiment of the present invention.
Embodiment
The present invention below will combine accompanying drawing (embodiment) to do further to detail:
With reference to Fig. 1, the present invention includes back-emf signal loud speaker 1, back-emf signal amplifier 2.Pass through the tight discovery of solving: loud speaker itself has comprised the accurate electrical information of voice coil loudspeaker voice coil motion (sound), and only needs just extract it with simple method so long.This electrical information is exactly " back-emf signal ".The loud speaker that can export back-emf signal is called " back-emf signal loud speaker ", and the amplifier that is used for handling back-emf signal is claimed " back-emf signal amplifier ".By " back-emf signal loud speaker " and " back-emf signal amplifier " mutual group COST system.
Below two formula very important:
U＝E+ZI
Here U is the voltage that power amplifier is added to loud speaker, the back electromotive force that E produces when being the voice coil loudspeaker voice coil motion, and Z is the total impedance (comprising induction reactance and resistance) of voice coil loudspeaker voice coil, I is the electric current that flows through voice coil loudspeaker voice coil.
That pay special attention to here is the back electromotive force E that produces in voice coil loudspeaker voice coil when motion, claims " E signal ".
E＝BLV
Here B is the magnetic flux density of speaker magnets, and L is a voice coil loudspeaker voice coil effective length and V is exactly the movement velocity of voice coil loudspeaker voice coil, i.e. our sound of hearing.From then on formula is seen " E signal direct ratio V (B L is a constant) ".
We say that the electrical information accurately that loud speaker itself has comprised voice coil loudspeaker voice coil motion (sound) is exactly the conclusion that obtains from top two formula.
We also find a considerable problem in formula U=E+ZI: the voltage that adds to loud speaker is U; And we hear is E (E direct ratio V); Obviously both are not directly proportional, even power amplifier and loud speaker all have no distortion in other words, and the still sound of distortion that we hear! So we can not push away the distortion fullliability to loud speaker.
Because the back-emf signal that produces during loudspeaker movements is to ensconce deeply in the loud speaker, instrument can't measure, and also just can't take out certainly.Obtaining back-emf signal must be with special method.Below be three kinds of embodiment:
Embodiment one
With reference to Fig. 2, be regarded as (K+1) section that effective length equates to loudspeaker voice coil, from the voice coil loudspeaker voice coil hot junction (end of the same name) to begin be the 1st section, up to K-1, K, the K+1 section arrive voice coil loudspeaker voice coil cold junction (non-same polarity) end again.Between K-1 section and K section, draw tap and make output.For conventional loud speaker, output (and between voice coil loudspeaker voice coil cold junction) should obtain Uo=2E+2I (ZL+R), E here, and ZL, R are the parameters of one section coil, I is the voice coil loudspeaker voice coil electric current.
The back-emf signal loud speaker is done 2 changes: at first the K+1 section is separated with the voice coil loudspeaker voice coil of motion, change in the soft iron that is placed on magnetic conduction in the loud speaker, the K+1 section is not participated in the motion of voice coil loudspeaker voice coil in other words, at this moment Uo=E+2I (Z
L+ R), reduced by an E.Then again with its reversal connection, according to self-inductance K, the resultant IZ of K+1 section
LEqual and opposite in direction, but offset because of in the opposite direction, so the time Uo=E+2IR, so far we see, output successfully captures the back-emf signal E of K section, we thirsted for just for this! K/one that its E value is the total E value of voice coil loudspeaker voice coil.As for the 2RI that appends on the E; Because R is that (induction reactance in the voice coil loudspeaker voice coil is then different for a constant that does not change with frequency; It is the function of frequency, and in loud speaker, also receives the influence of a lot of complicated factors), so in the E signal amplifier, be easily with its deduction (with " 2RI deducts circuit ").
Embodiment two
With reference to Fig. 3, with two resistance R 1, R2 total Uo value is made K/dividing potential drop and replace that movable K section can obtain Uo=E+I (Z among the embodiment one
L+ R), and in voice coil loudspeaker voice coil K-1 after the cancellation K section, the K+1 section links to each other and takes out tap, obtains the I (Z of negative value here
L+ R), again with the E+I (Z of electric resistance partial pressure
L+ R) mix addition, just offset I (Z
L+ R), remaining back electromotive force E signal outputs in the back-emf signal amplifier.This method is simple than embodiment one, and shortcoming is that the divider resistance adjustment is wanted accurately.
Embodiment three
With reference to Fig. 4; With loudspeaker voice coil be divided into two groups the parallel connection (the actual loudspeaker voice coil loudspeaker voice coil often all with two-wire and around), two groups all be from first section to the K section, two groups of direction of windings are identical; Every group of K-1; All draw output line between two sections of the K, for conventional loud speaker, two output lines (and between voice coil loudspeaker voice coil cold junction) all obtain magnitude of voltage: Uo=E+I (Z
L+ R).
The back-emf signal loud speaker is only done a bit to change: wherein one group K section changes in the soft iron that is fixed on magnetic conduction in the loud speaker, does not participate in the voice coil loudspeaker voice coil motion.The voltage that obtain on two groups of output lines this moment is respectively U1=E+I (Z
L+ R) and U2=I (Z
L+ R), this moment U1 and U2 to be delivered to subtract each other in the back-emf signal amplifier and just can obtain back electromotive force E signal, numerical value is K/one of the total E value of voice coil loudspeaker voice coil.This method is compared with preceding two methods, and advantage is to have lacked reverse winding, thereby reduces the loss of magnetic flux, so voice coil loudspeaker voice coil efficient is high.Shortcoming is to increase an output line, so be useful in the active audio amplifier.
Because loud speaker can export back-emf signal, so title " back-emf signal loud speaker ", it is our desired mark Huaihe River four-terminal network that obtains.Can see that " back-emf signal loud speaker " structure is simple, material cost the same with conventional loud speaker (only being that technique for coiling is complicated a little).
The back-emf signal amplifier has difference in essence with conventional amplifier (referring to the pure back of power amplifier level); Signal amplifier is the element (back-emf signal loud speaker output with back-emf signal amplifier input negative terminal be connected) of loud speaker as self; For sound (being back-emf signal) amplifies, amplify for guaranteeing that sound is undistorted; And conventional amplifier is the element (amplifier output K dividing potential drop after with input negative terminal link to each other) of loud speaker as self, only guarantees that self is undistorted and amplifies.
When the input of both anodes all is identical Ui, but the E of output is inequality:
For the total E value of back-emf signal amplifier E=KUi is that sound (E) is directly proportional with input voltage (Ui).
For the total E value of the amplifier of routine E=KUi-ZI is that sound (E) is not directly proportional with input voltage (Ui).
Claims (4)
1. undistorted sound equipment playback system of back-emf signal; It is characterized in that: comprise back-emf signal loud speaker (1), back-emf signal amplifier (2); When the distortion of loud speaker own and paper disc movement velocity receive the influence of air compressing in the audio amplifier or sound reflection, resonance, standing wave, harmonic factor and squint desired value; The voice coil loudspeaker voice coil that links to each other with paper disc in the back-emf signal loud speaker (1) detects the deviation of generation immediately, and deviation is fed back to back-emf signal amplifier (2), and back-emf signal amplifier (2) produces response immediately; The processing of rectifying a deviation is till the deviation complete obiteration.
2. the undistorted sound equipment playback system of a kind of back-emf signal according to claim 1; It is characterized in that: the voice coil loudspeaker voice coil in the said back-emf signal loud speaker (1) can be considered the K+1 section that effective length equates, beginning from voice coil loudspeaker voice coil end of the same name is the 1st section, up to K-1, K, K+1 section; Arriving the voice coil loudspeaker voice coil non-same polarity again finishes; Between K-1 section and K section, draw tap and make output, the K+1 section is separated with the voice coil loudspeaker voice coil of motion, change on the soft iron that is fixed on magnetic conduction in the loud speaker; Do not participate in the motion of voice coil loudspeaker voice coil, and with its reversal connection.
3. the undistorted sound equipment playback system of a kind of back-emf signal according to claim 1; It is characterized in that: the voice coil loudspeaker voice coil in the said back-emf signal loud speaker (1) can be divided into two groups of parallel connections; Two groups all be from the 1st section to the K section, two groups of direction of windings are identical, draw tap between every group of K-1 section and the K section and make output; And wherein one group K section changes on the soft iron that is fixed on magnetic conduction in the loud speaker, does not participate in the motion of voice coil loudspeaker voice coil.
4. the undistorted sound equipment playback system of a kind of back-emf signal according to claim 1; It is characterized in that: the voice coil loudspeaker voice coil in the said back-emf signal loud speaker (1) can be considered the K section that effective length equates, beginning from voice coil loudspeaker voice coil end of the same name is the 1st section, up to K-1, K section; Arriving the voice coil loudspeaker voice coil non-same polarity again finishes; Between K-1 section and K section, draw tap and make output, the K section is separated with the voice coil loudspeaker voice coil of motion and reversal connection, change on the soft iron that is fixed on magnetic conduction in the loud speaker; Do not participate in the motion of voice coil loudspeaker voice coil; In addition, total output voltage values U is made K/dividing potential drop at two divider resistances of input termination of back-emf signal loud speaker (1), again and the absolute value of voltage of drawing output between K-1 section and the K section subtract each other.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110381415A (en) * | 2019-08-27 | 2019-10-25 | 联想(北京)有限公司 | A kind of loudspeaker, information processing unit and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110381415A (en) * | 2019-08-27 | 2019-10-25 | 联想(北京)有限公司 | A kind of loudspeaker, information processing unit and method |
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Application publication date: 20121128 |