CN101409543B - Method for modulating multi-standard-bit pulse width - Google Patents
Method for modulating multi-standard-bit pulse width Download PDFInfo
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Abstract
The present invention relates to a multi-level width modulating method for sampling an input signal so as to generate a corresponding pulse width modulating signal; wherein, the pulse width modulating signal comprises at least a modulating pulse. The multi-level pulse width modulating method is characterized in that: energy is improved gradually in a multi-step manner in the modulating pulse so as to lead the rising edge of the modulating pulse to lean slightly, thus reducing the instant energy change. The multi-level pulse width modulating method provided by the present invention leads the waveform of the pulse width modulating signal to change meekly, so the instant energy change is meeker than that in the prior art, and the degree of the instant energy change can be effectively reduced. If the improved pulse width modulating signal is used for driving a loudspeaker, the occurrence of noise can be greatly reduced; therefore the signal is very practical.
Description
Technical field
The present invention relates to a kind of pulse-width modulation method, particularly relate to a kind of impulse wave, can effectively reduce many level pulse widths modulator approach (Multi-Level Pulse Width Modulation Method) of transient energy intensity of variation with skewed edge.
Background technology
Pulse width modulation (Pulse Width Modulation, PWM below all abbreviate PWM as) utilizes the different work periods to represent various signals (signal is a signal, and this paper all is called signal).See also shown in Figure 1ly, be the oscillogram of employed a kind of PWM (pulse width modulation) signal in the existing known techniques.In this kind technology, the waveform of pwm signal is made up of the different square wave of width, and what the square wave of broad was represented is higher energy, and narrower square wave is then represented less energy.By using this type of pwm signal to promote loudspeaker, just can produce the voice output of analogy from loudspeaker.This type of drive is adopted by many voice outputs.
Owing to be subjected to the restriction of operating frequency,, and can't give expression to the content of signal originally very accurately between sample frequency and resolution so general pwm signal must average out.This situation can cause the anaiog signal of output to produce distortion.In order to address this problem, many people propose the various modes that increase resolution or sample frequency under same operating frequency.For instance, No. the 453045th, TaiWan, China, the patent of by name " modulating device of many level pulse widths and control structure thereof " has just proposed a kind ofly keeping the technology that is improved resolution under the prerequisite of sampling rate.
In addition, see also shown in Figure 2, the oscillogram of the another kind of pwm signal that is adopted for existing known techniques.In this technology, except width, also merge the size used each side's wave amplitude in the pwm signal to represent the energy of its representative.
Yet, no matter be general PWM technology or the technology that formed through improvement afterwards, all be the employing square wave is a reference waveform.In other words, the part at each square wave rising edge all is that a huge transient energy strengthens.If use such pwm signal to remove to promote aforesaid loudspeaker, the energy of so this moment strengthens the unexpected variation that just probably causes on the sound, just general alleged sonic boom.
So the signal that the present PWM technology of using is generated still has its defective to exist, and has also just become an important problem and how to improve these signals.
This shows that above-mentioned existing pulse-width modulation method obviously still has inconvenience and defective, and demands urgently further being improved in method and use.For solving the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and conventional method does not have appropriate method to address the above problem, this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of new many level pulse widths modulator approach, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Because the defective that above-mentioned existing pulse-width modulation method exists, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, and the utilization of cooperation scientific principle, actively studied innovation, in the hope of founding a kind of new many level pulse widths modulator approach, can improve general existing pulse-width modulation method, make it have more practicality.Through constantly research, design, and after studying repeatedly and improving, create the present invention who has practical value finally.
Summary of the invention
The objective of the invention is to, overcome the defective that existing pulse-width modulation method exists, is to make it can reduce the degree that transient energy changes and a kind of new many level pulse widths modulator approach, technical problem to be solved are provided, and is very suitable for practicality.
The object of the invention to solve the technical problems realizes by the following technical solutions.A kind of many level pulse widths modulator approach according to the present invention's proposition, be used for an input signal is taken a sample to produce a corresponding pulse width modulating signal, this pulse width modulating signal comprises at least one modulating pulse, this many level pulse widths modulator approach is characterised in that: progressively promote energy in multistage mode in this modulating pulse, it is skewed that the rising edge of this modulating pulse is rendered as haply, changes to reduce transient energy.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid many level pulse widths modulator approach, the work period of wherein said modulating pulse is across a plurality of unit interval, and at most only increases a unit energy within two adjacent unit interval.
Aforesaid many level pulse widths modulator approach, it comprises the following steps: to start from scratch progressively increases by a pulse width modulation count value, and producing a plurality of these different pulse width modulation count values, and this pulse width modulation count value is an integer; And this pulse width modulation count value arrive this modulating pulse can across the unit interval quantity of maximum before, for each this pulse width modulation count value, determine a pulse width modulation output valve, wherein:, make this pulse width modulation output valve that is determined at most only have more a unit energy than preceding this pulse width modulation output valve that is once determined when this pulse width modulation count value is not less than 0 and less than one first preset value the time.
Aforesaid many level pulse widths modulator approach, wherein said this pulse width modulation output valve of being determined of making at most only has more the step of a unit energy than preceding this pulse width modulation output valve that is once determined, it comprises: utilize a reference count value to indicate a corresponding unit interval in this modulating pulse: this reference count value of initialization is zero; Set the maximum energy value that an increment count value will be represented in the unit interval for the rising edge in this modulating pulse; And progressively increase this reference count value to this first preset value and gradually reduce this increment count value to zero, and before this reference count value arrives this first preset value and this increment count value arrival zero, make this pulse width modulation output valve add 1 for this reference count value.
Aforesaid many level pulse widths modulator approach, wherein said first preset value is 2n-1, n is the bit number of expression amplitude resolution.
Aforesaid many level pulse widths modulator approach, wherein more comprise in this pulse width modulation output valve in decision: when this pulse width modulation count value is not less than this first preset value and is not more than this work period when deducting this first preset value, making this pulse width modulation output valve is peak swing.
Aforesaid many level pulse widths modulator approach, wherein in this pulse width modulation output valve of decision, more comprise: when this pulse width modulation count value deducts this first preset value greater than this work period, and when being not less than this work period, make this pulse width modulation output valve that is determined at most only reduce by a unit energy than preceding this pulse width modulation output valve that is once determined.
Aforesaid many level pulse widths modulator approach, it more comprises: progressively reduce energy in multistage mode in this modulating pulse, make the falling edge of this modulating pulse be rendered as skewed to reduce the transient energy variation haply.
Aforesaid many level pulse widths modulator approach, it more comprises: utilize a reference count value to indicate a corresponding unit interval in this modulating pulse: this reference count value of initialization is zero; Set the maximum energy value that an increment count value will be represented in the unit interval for the rising edge in this modulating pulse; And progressively increase this reference count value to one second preset value and gradually reduce this increment count value to zero, and arrive this second preset value and this increment count value in this reference count value and arrived before zero, make in this modulating pulse to be worth the energy unit that the pairing unit interval exports by this reference count and to add 1 for this reference count value.
Aforesaid many level pulse widths modulator approach, wherein said second preset value is 2n-1, n is the bit number of expression amplitude resolution.
The present invention compared with prior art has tangible advantage and beneficial effect.As known from the above, for achieving the above object, the present invention proposes a kind of many level pulse widths modulator approach, and it is used for input signal is taken a sample to produce corresponding pulse width modulating signal, wherein, this pulse width modulating signal comprises at least one modulating pulse.This many level pulse widths modulator approach is characterised in that in multistage mode and progressively promotes energy, makes the edge of this modulating pulse be rendered as skewed to reduce the transient energy variation haply.
In one embodiment of the invention, at first be to start from scratch progressively to increase the pulse width modulation count value to produce a plurality of different pulse width modulation count values.Arrived in this pulse width modulation count value before the work period of modulating pulse, determine a corresponding pulse width modulation output valve for each pulse width modulation count value, wherein be not less than 0 and the time when the pulse width modulation count value, make the pulse width modulation output valve that is determined at most only have more a unit energy than the preceding pulse width modulation output valve that is once determined less than one first preset value.
In one embodiment of the invention, in decision pulse width modulation output valve, more be not less than aforesaid first preset value in the pulse width modulation count value, and be not more than the aforementioned work period when deducting this first preset value, making the pulse width modulation output valve is peak swing.
In one embodiment of the invention, in decision pulse width modulation output valve, more deduct first preset value greater than the aforementioned work period in the pulse width modulation count value, and when being not less than this work period, make the pulse width modulation output valve that is determined at most only reduce by a unit energy than the preceding pulse width modulation output valve that is once determined.
By technique scheme, many level pulse widths of the present invention modulator approach has following advantage and beneficial effect at least: the present invention is because make the composition waveform of pulse width modulating signal that comparatively gentle variation be arranged, so just come to such an extent that relax than existing known techniques on transient energy changes.If use the pulse width modulating signal of this kind improvement to promote loudspeaker, the situation of noise generation can access significantly and improve so.
In sum, many level pulse widths of the present invention modulator approach can effectively reduce the degree that transient energy changes.The present invention slows down the rate of climb of rising edge in the PWM waveform, can reduce the intensity of variation of energy by this and promotes the fluency of follow-up class specific output, reduces the electromagnetic interference that is produced because of energy changing strongly.The present invention has above-mentioned plurality of advantages and practical value, no matter it all has bigger improvement on method or function, obvious improvement is arranged technically, and produced handy and practical effect, and more existing pulse-width modulation method has the outstanding effect of enhancement, thereby being suitable for practicality more, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the oscillogram of the existing employed a kind of pwm signal of known techniques.
The oscillogram of the another kind of pwm signal that Fig. 2 is adopted for existing known techniques.
Fig. 3 is the oscillogram according to the pulse width modulating signal that one embodiment of the invention produced.
Fig. 4 is for producing the flow chart of the method for pwm signal according to one embodiment of the invention.
Fig. 5 is according to a modulating pulse figure in the pwm signal that one embodiment of the invention produced.
Fig. 6 is the flow chart according to one embodiment of the invention employed method when producing rising edge.
Fig. 7 produces circuit block diagram used when delaying rising edge according to an embodiment of the invention.
Fig. 8 is for being shown in the detailed circuit calcspar of the back segment drive circuit among Fig. 7 according to an embodiment of the invention.
S400～S460: the administration step of one embodiment of the invention
S600～S660: the administration step of another embodiment of the present invention
700: control unit 702: the clock pulse generation unit
704: counter 706: latch unit
708: inverter 710: arithmetic unit
712: comparator 714,716: pulse bandwidth drive circuit
718,718a: current steering logic 72,72a: back segment drive circuit
800,810,830: multiplexer 802: the increment buffer
804: subtracter 812: the benchmark buffer
814: adder
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to its embodiment of many level pulse widths modulator approach, method, step, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
See also shown in Figure 3ly, be oscillogram according to the pulse width modulating signal that one embodiment of the invention produced.In order to reduce the energy changing of moment, for pulse width modulation (pulse widthmodulation, PWM) each that signal comprised is through the impulse wave (then claim modulating pulse) that modulation is produced, and should make rising edge and falling edge for slow liter or to delay the state that falls preferable.But comparatively speaking, the user generally comparatively payes attention to unexpected energy increases the noise influence (because can cause sonic boom) that is brought, if add that a plurality of pulse width modulations are moved simultaneously and operating mode is snap left (Left-aligned), then the influence of rising edge is bigger, because each PWM (pulse width modulation) rises simultaneously, but descend when different.So can only make that also rising edge is slow the liter, and falling edge is the quick decline of general square wave formula.
In order to produce the slow waveform that falls in two sides as shown in Figure 3, a feasible modus operandi is shown among Fig. 4.See also shown in Figure 4ly, be the flow chart of the method that produces PWM (pulse width modulation) signal according to one embodiment of the invention.In the present embodiment, the method that this produces PWM (pulse width modulation) signal is to adopt multistage mode progressively to promote the energy of each modulating pulse.The method that this produces pwm signal may further comprise the steps:
At first, confirmed earlier that before any modulating pulse of output its pulse width modulation output valve is 0 (step S400).
Next pulse width modulation count value X (for integer) is set at 0 so that beginning operation (X can regard the numerical value of representing on the transverse axis as) (step S410).
When pulse width modulation count value X between 0 and 2
n(0≤X＜2 in the time of between-1 (n is the bit number of amplitude resolution)
n-1), just progressively promote the pulse width modulation output valve, that is, make the pulse width modulation output valve that will export have more a unit energy (step S420) at most than previous pulse width modulation output valve in same modulating pulse the inside.
Moreover, when pulse width modulation count value X between 2
n-1 deducts 2 with work period (duty cycle) PWMD of this modulating pulse
nIn the time of between-1 (2
n-1≤X≤PWMD-(2
n-1)), just make the pulse width modulation output valve be maximum square wave amplitude (step S430);
Deduct 2 and work as pulse width modulation count value X greater than work period PWMD
n-1 is not more than work period PWMD, and (PWMP-(2
n-1)＜X≤PWMD) time, just begin progressively to reduce pulse width modulation output valve (step S440).
After carrying out above-mentioned operation at a pulse width modulation count value X, this pulse width modulation count value X will be incremented 1 (step S450) at every turn.
Also be not incremented at pulse width modulation count value X before the work period PWMD of this modulating pulse, repeat aforesaid step S420～S450 with output signal, and after pulse width modulation count value X arrives work period PWMD (step S460), finish aforementioned operation and output is reset to 0 (step S470).
Next enumerate a real example, so that those skilled in the art can understand technology provided by the present invention more easily.See also shown in Figure 5, for according to a modulating pulse figure in the pwm signal that one embodiment of the invention produced.In the present embodiment, the resolution bit number of amplitude is 2, so the amplitude size has four kinds of variations, it is respectively the energy that a unit has then been represented at the interval of numerical value 0～3, the two adjacent numerals on as shown in Figure 5 the vertical axis; Moreover the work period of the modulating pulse among this embodiment (PWMD) is 7 (0～7), and time width (PWMP) then is 9 (0～9).
According to administration step shown in Figure 4, begin to increase progressively it in the pulse width modulation count value when X is 0 and be output as 1.Next, along with pulse width modulation count value X is incremented to 1 and 2 respectively (less than 2
2-1=3), PWM output valve (amplitude) also just is incremented into accordingly the energy (step S420) of 2 and 3 units.
Next, be 3 and 4 (3=2 at pulse width modulation count value X
2Then make the PWM output valve be maximum square wave amplitude 3 (step S430) in the time of-1≤X≤7-3=4).
At last, be that 5～7 (7-(2 at pulse width modulation count value X
2-1)=4＜X≤7) time, the PWM output valve will be decremented to 0 (step S440) one by one.And when X was 8～9, the PWM output valve then was 0 (or saying termination output).
Though must be noted that example mentioned herein is the work period PWMD situation different with integral cycle PWMP of modulating pulse, the situation that work period PWMD is identical with integral cycle PWMP also is suitable for this kind mode and produces modulating pulse.Moreover though the rising source of the waveform that produces all is definitely to increase progressively among aforementioned two embodiment, these those skilled in the art are when knowing, it also can be the rising mode (promptly the energy that may be presented the adjacent unit interval of two-phase is identical) that increases progressively relatively.
Next see also shown in Figure 6ly, be flow chart according to one embodiment of the invention employed method when producing rising edge.In the present embodiment, at first, a reference count value of first initialization (BAS) (step S600), this reference count value are equal to the pulse width modulation count value X among the previous embodiment, can be used to refer to a corresponding unit interval in the modulating pulse.
Next, the maximum energy value that will present in the unit interval of each in rising edge is set to an increment count value (INC) (step S610).
Next, this method progressively increases reference count value BAS to 2
n-1, and gradually reduce increment count value INC to zero, and arrive 2 at reference count value BAS
n-1 and increment count value INC arrived before zero, making the pulse width modulation output valve is reference count value BAS (the step S620～S660) that adds 1.
With waveform shown in Figure 5 is example, because the required energy that presents of modulating pulse is bigger, so rising edge can rise to the peak swing place.In other words, the maximum energy value that will present in the unit interval in the rising edge is 3.Therefore, except reference count value BAS is initialized as 0 (the step S600), also increment count value INC is set at 3 (step S610).
Next, in the flow process of the first round, in step S620 because increment count value INC is not 0, so the output of time point 0 (because reference count value BAS is 0 at present) can be 1 (0+1).And owing to increment count value INC in step S630 is not 0, so this increment count value INC can be decremented to 2 (step S640).Owing in step S650, judge reference count value BAS and be not 3 (22-1=3), be 1 (step S660) again, and make flow process get back to step S620 to proceed down so reference count value BAS can be incremented.
In second flow process of taking turns, because increment count value INC is not 0, so the output of time point 1 (BAS is 1) can be 2 (BAS+1=2).Similarly, increment count value INC can be decremented to 1, and it is 2 that reference count value BAS then is incremented.Next, in the flow process of third round, because increment count value INC still is not 0, so the output of time point 2 (BAS is 2) can be 3 (BAS+1=3), and increment count value INC can be decremented to 0, and it is 3 that reference count value BAS then is incremented.
In the flow process of four-wheel, because increment count value INC has become 0, so the output of time point 3 can be 3 (values of BAS just), and because increment count value INC be 0 and reference count value BAS be 3, conform with the regulations so step S650 judges, this program will be moved to end.
By mode shown in Figure 6, can make the adjustment pulse that a rising edge tilts easily.Certainly, mode shown in Figure 6 also can be combined in and produce the rising edge of adjusting pulse among the step S420 of Fig. 4.
See also shown in Figure 7, used circuit block diagram when producing slow rising edge according to an embodiment of the invention.In this circuit, control unit 700, clock pulse generation unit (clock generator) 702, counter 704, latch unit 706, inverter 708, arithmetic unit 710, comparator 712 and pulse bandwidth drive circuit 714 and the 716 pulse bandwidth modulation circuit for being adopted in the existing known techniques, its operation is to control the output frequency of clock pulse generation unit (clock generator) 702, the output mode of latch unit 706 and the comparison pattern of comparator 712 with control unit 700 haply.Latch unit 706 is with the audio data DA output that is received, and it can produce the numerical value of a present pulse bandwidth after the calculating through inverter 708 and arithmetic unit 710, and this numerical value is imported into an input of comparator 712; Another input of comparator 712 is the output numerical value of count pick up device 704 then, and this output numerical value is the numerical value of predetermined pulse bandwidth.These two numerical value are used to decision and whether start pulse bandwidth drive circuit 714 and 716, to produce pulse bandwidth modulation signal PWM0 and PWM1 respectively after comparing through comparator 712.
Main difference between present embodiment shown in Figure 7 and the existing known techniques is to have increased newly a current steering logic 718.The output that this current steering logic 718 receives comparator 712 changes and the pulse bandwidth modulation signal CUR of change to produce based on electric current.
See also shown in Figure 8, for being shown in the detailed circuit calcspar of the back segment drive circuit 72 among Fig. 7 according to an embodiment of the invention.In Fig. 8, comparator among the back segment drive circuit 72a 712 sends the signal that is produced to current steering logic 718a.Increment buffer 802 is in order to store increment count value INC, and itself and subtracter 804 are combined into an increment counter; Benchmark buffer 812 is in order to store reference count value BAS, and itself and 814 of adders are combined into a reference counter.Multiplexer 800 determines it is that output with subtracter 804 is deposited in the increment buffer 802 according to the output valve of comparator 712, or the energy value (inc_value) that will show is deposited into (as the step S610 of Fig. 6) in the increment buffer 802.Similarly, multiplexer 810 determines it is the output of adder 814 to be stored in the benchmark buffer 812 according to the output valve of comparator 712, or the benchmark buffer will be initialized as 0 (that is, be deposited in the benchmark buffer 812 0, as the step S600 of Fig. 6).
The value of being exported by increment buffer 802 will be used for controlling multiplexer 830.By this, multiplexer 830 can increase progressively 1 from the output of the output of benchmark buffer 812, benchmark buffer 812, among lowest high-current value MAX_CUR and four values such as 0, determine to export one of them according to flow process shown in Figure 6 and be pulse bandwidth modulation signal CUR.
In sum, the present invention slows down the rate of climb of rising edge in the PWM waveform, can reduce the intensity of variation of energy by this and promotes the fluency of follow-up class specific output, reduces the electromagnetic interference that is produced because of energy changing strongly.Certainly, this kind practice also can be used in the falling edge in the PWM waveform, and also has suitable effect.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solution of the present invention content, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (7)
1. level pulse widths modulator approach more than a kind, be used for an input signal is taken a sample to produce a corresponding pulse width modulating signal, this pulse width modulating signal comprises at least one modulating pulse, and this many level pulse widths modulator approach is characterised in that:
Start from scratch and progressively increase by a pulse width modulation count value, producing a plurality of these different pulse width modulation count values, and this pulse width modulation count value is an integer; And
The work period of this modulating pulse is across a plurality of unit interval, and this pulse width modulation count value arrive this modulating pulse can across the unit interval quantity of maximum before, for each this pulse width modulation count value, determine a pulse width modulation output valve, wherein:
When this pulse width modulation count value is not less than 0 and during less than one first preset value, wherein this first preset value is 2
n-1, n is the bit number of expression amplitude resolution, make this pulse width modulation output valve that is determined greater than preceding this pulse width modulation output valve that is once determined, thereby make the stepped rising of rising edge of this modulating pulse, reduce the transient energy variation progressively to promote energy.
2. many level pulse widths modulator approach as claimed in claim 1, it is characterized in that wherein being not less than 0 and, make this pulse width modulation output valve that is determined at most only have more a unit energy than preceding this pulse width modulation output valve that is once determined less than this first preset value when this pulse width modulation count value.
3. many level pulse widths modulator approach as claimed in claim 2, it is characterized in that wherein said this pulse width modulation output valve of being determined of making at most only has more the step of a unit energy than preceding this pulse width modulation output valve that is once determined, it comprises:
Utilize a reference count value to indicate a corresponding unit interval in this modulating pulse:
This reference count value of initialization is zero;
Set the maximum energy value that an increment count value will be represented in the unit interval for the rising edge in this modulating pulse; And
Progressively increase this reference count value to this first preset value and gradually reduce this increment count value, and arrive this first preset value and this increment count value arrived before zero, make this pulse width modulation output valve add 1 for this reference count value in this reference count value to zero.
4. many level pulse widths modulator approach as claimed in claim 2 is characterized in that wherein more comprising in this pulse width modulation output valve of decision:
When this pulse width modulation count value is not less than this first preset value and is not more than this work period when deducting this first preset value, making this pulse width modulation output valve is peak swing.
5. many level pulse widths modulator approach as claimed in claim 2 is characterized in that wherein more comprising in this pulse width modulation output valve of decision:
When this pulse width modulation count value deducts this first preset value greater than this work period, and when being not less than this work period, make this pulse width modulation output valve that is determined at most only reduce by a unit energy than preceding this pulse width modulation output valve that is once determined.
6. many level pulse widths modulator approach as claimed in claim 1 is characterized in that it more comprises: progressively reduce energy in multistage mode in this modulating pulse, the stepped decline of falling edge of this modulating pulse is changed to reduce transient energy.
7. level pulse widths modulator approach more than a kind, be used for an input signal is taken a sample to produce a corresponding pulse width modulating signal, this pulse width modulating signal comprises at least one modulating pulse, and this many level pulse widths modulator approach is characterised in that:
Utilize a reference count value to indicate a corresponding unit interval in this modulating pulse:
This reference count value of initialization is zero;
Set the maximum energy value that an increment count value will be represented in the unit interval for the rising edge in this modulating pulse; And
Progressively increase this reference count value to one second preset value and gradually reduce this increment count value to zero, wherein, this second preset value is 2
n-1, n is the bit number of expression amplitude resolution, and arrive this second preset value and this increment count value in this reference count value and arrived before zero, make in this modulating pulse to be worth the energy unit that the pairing unit interval exports by this reference count and to add 1 for this reference count value.
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| CN2007101631468A CN101409543B (en) | 2007-10-10 | 2007-10-10 | Method for modulating multi-standard-bit pulse width |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1410963A (en) * | 2001-09-28 | 2003-04-16 | 佳能株式会社 | Driving signal generator and picture display |
| CN1420624A (en) * | 2001-09-26 | 2003-05-28 | 株式会社东芝 | Crackle suppressing circuit and sound output amplifier |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1420624A (en) * | 2001-09-26 | 2003-05-28 | 株式会社东芝 | Crackle suppressing circuit and sound output amplifier |
| CN1410963A (en) * | 2001-09-28 | 2003-04-16 | 佳能株式会社 | Driving signal generator and picture display |
Non-Patent Citations (1)
| Title |
|---|
| US 2003006922 A1,说明书第99-134段,附图12、15、16. |
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