CN1169131C - AC signal detecting method and its DC level level detecting method - Google Patents
AC signal detecting method and its DC level level detecting method Download PDFInfo
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- CN1169131C CN1169131C CNB021277079A CN02127707A CN1169131C CN 1169131 C CN1169131 C CN 1169131C CN B021277079 A CNB021277079 A CN B021277079A CN 02127707 A CN02127707 A CN 02127707A CN 1169131 C CN1169131 C CN 1169131C
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Abstract
The present invention relates to an AC signal and a DC potential intensity detection method thereof, which is applied to an amplifier, an analog-digital converter and a digital signal processor. The amplifier outputs an AC signal to the analog-digital converter to enable the digital signal processor to output a potential control signal to the amplifier. The amplifier outputs the AC signal to the analog-digital converter to be converted after horizontally moving first potential by controlling the potential control signal, so a relative value can be obtained. The digital signal processor can obtain an absolute value of the AC signal according to the relative value, the first potential and an output limiting value and an input limit value of the analog-digital converter. The digital signal processor can obtain the DC potential intensity of the AC signal according to the absolute value of the AC signal.
Description
Technical field
The present invention relates to a kind of signal extreme value and DC potential strength detecting method thereof of AC signal, refer to be applied to the signal extreme value and the DC potential strength detecting method thereof of the AC signal on an amplifier, an analog-digital converter and the digital signal processor especially.
Background technology
See also Fig. 1, be that an optical read head 10 is arranged at the direction of motion synoptic diagram in the optical pickup device of CD-ROM drive for example, it mainly moves along two kinds of directions, first kind of direction is focus direction (the focusing direction perpendicular to the discs surface, be called for short F), and second kind of direction is the tracking direction (tracking direction is called for short T) that is parallel to the discs surface.And be the mobile FEEDBACK CONTROL of carrying out that can carry out tracking direction to this optical read head, function block schematic diagram as shown in Figure 2, produce a tracking error signal (Tracking Error, be called for short TE) provide control system to carry out reference, optical inductor 20 on the optical read head is received from the discs laser light reflected will produce A, B, C, D, E and six signals of F, and E and F signal are sent into the tracking error signal (TE) that can obtain in the operational amplifier 21 shown in Fig. 3 (a).
In ideal state, tracking error signal (TE) is that a direct current composition is zero ac voltage signal, and when the amplitude of tracking error signal (TE) is zero, represent the optimum condition of tracking, therefore the zero point of tracking error signal (TE) one important references point when carrying out FEEDBACK CONTROL, but the tracking error signal (TE) that is produced by optical inductor on the optical read head 20 and operational amplifier 21 in fact, what all have some flip-flops is sneaked into this tracking error signal (TE), and make the current potential (accurate position) of this tracking error signal (TE) produce skew (shown in Fig. 3 (b)), cause actual zero point and desirable zero point not to overlap, and be to improve this problem, the action of tracking balance (tracking balance) will be imported into utilization.
Refer again to function block schematic diagram shown in Figure 2, the action of so-called tracking balance (tracking balance) is finished by following assembly, analog-digital converter (Analog-to-Digital Converter wherein, be called for short ADC) 22 tracking error signal (TE) taken a sample and convert digitizing numerical value to after, carry out the detection of peak value and valley with peak detctor 23 (peak detector) and valley value detector 24 (bottom detector) again, tracking balance device 25 estimates out the degree of present potential shift again according to resulting peak value and valley then, and then, be used for the flip-flop that originally should not exist is offset to the remedy defects correction of voltage (offset voltage) of operational amplifier 21.
But because of the intensity of tracking error signal (TE) exceeds 22 scopes that can receive of analog-digital converter most probably, cause 22 tracking error signals that can read of analog-digital converter (TE) waveform shown in Fig. 3 (c), so that follow-up peak detctor (peak detector) is incorrect with resulting peak value of valley value detector (bottom detector) or/and valley, and then can't estimate out the degree that actual potential is offset, make the follow-up voltage that remedies defects that carries out (offset voltage) correction can't effectively reach purpose.And how to improve the disappearance of above-mentioned conventional means, for developing fundamental purpose of the present invention.
Summary of the invention
The object of the present invention is to provide a kind of signal extreme value and DC potential strength detecting method thereof of AC signal, intensity at tracking error signal (TE) exceeds under the situation of 22 energy range of receiving of analog-digital converter, still can correctly estimate out the degree of actual potential skew, make that the follow-up voltage that remedies defects (offsetvoltage) that carries out correction can be carried out really.
The object of the present invention is achieved like this:
The present invention discloses a kind of DC potential detection method of AC signal, is applied on an amplifier, an analog-digital converter and the digital signal processor, and this amplifier is exported an AC signal to this analog-digital converter.This method comprises the following steps: to make this digital signal processor to export a control of Electric potentials signal to this amplifier; This amplifier is to control that should the control of Electric potentials signal and change exporting this analog-digital converter to behind this AC signal translation one first current potential, and then obtains a relative value; This digital signal processor draws the absolute value of this AC signal according to the output/input limits value of this relative value, this first current potential and this analog-digital converter; And this digital signal processor obtains the DC potential intensity of this AC signal according to the absolute value of this AC signal.
According to above-mentioned conception, this amplifier can be an operational amplifier in the DC potential detection method of AC signal of the present invention.
According to above-mentioned conception, the absolute minimum of this AC signal can be tried to achieve by following formula in the DC potential detection method of AC signal of the present invention: absolute minimum=relative minimum-(first current potential * output stage limit value/input limits value).
According to above-mentioned conception, the absolute maximum of this AC signal can be tried to achieve by following formula in the DC potential detection method of AC signal of the present invention: absolute maximum=relative maximum+(second current potential * output stage limit value/input limits value).
According to above-mentioned conception, comprise the following steps: also in the DC potential detection method of AC signal of the present invention that this digital signal processor changes the size of this control of Electric potentials signal to DC potential intensity that should AC signal, and then make this amplifier the DC potential of this AC signal is adjusted into zero control that should the control of Electric potentials signal.
The present invention also discloses a kind of signal detecting method, be applied on an amplifier, an analog-digital converter and the digital signal processor, this amplifier is exported an AC signal to this analog-digital converter, and this method comprises the following steps: to make this digital signal processor to export a control of Electric potentials signal to this amplifier; This amplifier is to control that should the control of Electric potentials signal and change exporting this analog-digital converter to behind this AC signal translation one current potential, and then obtains a relative extreme; And this digital signal processor draws the absolute extremes of this AC signal according to the output/input limits value of this relative extreme, this current potential and this analog-digital converter.
According to above-mentioned conception, this amplifier can be an operational amplifier in the signal detecting method of the present invention.
According to above-mentioned conception, the absolute minimum of this AC signal can be tried to achieve by following formula in the signal detecting method of the present invention: absolute minimum=relative minimum-(current potential * output stage limit value/input limits value).
According to above-mentioned conception, the absolute maximum of this AC signal can be tried to achieve by following formula in the signal detecting method of the present invention: absolute maximum=relative maximum+(current potential * output stage limit value/input limits value).
According to above-mentioned conception, this amplifier among the present invention, this analog-digital converter and this digital signal processor can be arranged in the optical pickup device.
Description of drawings
The present invention is able to more deep understanding by following accompanying drawing and detailed description:
Fig. 1 is that an optical read head is arranged at the direction of motion synoptic diagram in the CD-ROM drive;
Fig. 2 utilizes tracking error signal to carry out the common function block schematic diagram of tracking balance;
Fig. 3 (a) (b) (c) is the waveform synoptic diagram of various tracking error signal;
Fig. 4 is for carrying out the function block schematic diagram of the required hardware of preferred embodiment method of the present invention;
Fig. 5 (a) (b) (c) when carrying out preferred embodiment method of the present invention, the potential change synoptic diagram of this tracking error signal waveform.
Each included in the accompanying drawing of the present invention assembly lists as follows:
| | Optical inductor 20 |
| Operational amplifier 21 | Analog-digital converter 22 |
| Peak detctor 23 | Valley value detector 24 |
| Tracking balance device 25 | |
| | Analog- |
| Digital signal processor 43 | Peak |
| Valley | |
Embodiment
See also Fig. 4, it carries out the function block schematic diagram of the required hardware of preferred embodiment method of the present invention, it mainly includes optical inductor 40, operational amplifier 41, analog-digital converter 42 and digital signal processor 43, wherein optical inductor 40 is received from the discs laser light reflected and will produces A, B, C, D, E and six signals of F, and E and F signal are sent into the tracking error signal (TE) that operational amplifier 41 carries out the computing of E-F and amplifies back output one form of communication.And the intensity of working as tracking error signal (TE) exceeds 42 scopes that can receive of analog-digital converter, to cause 42 tracking error signals that can read of analog-digital converter (TE) waveform shown in Fig. 5 (a), for solving this problem, make the tracking balance device 433 in the digital signal processor 43 export a control of Electric potentials signal to this operational amplifier 41, this operational amplifier 41 just makes progress to control that should the control of Electric potentials signal and with this AC signal and exports this analog-digital converter 42 behind translation one first current potential to and change and input to valley value detector 432 in the digital signal processor 43, and then obtain a relative minimum, in addition, this operational amplifier 41 also can be to control that should the control of Electric potentials signal and is changed and input to peak detctor 431 in the digital signal processor 43 with exporting this analog-digital converter 42 behind downward translation one second current potential of this AC signal to, and then obtains a relative maximum.At last, tracking balance device 433 in this digital signal processor 43 just can draw the absolute maximum and the absolute minimum of this AC signal according to the ultimate value of this relative minimum, this relative maximum, this first current potential, this second current potential and this analog-digital converter 42, and then estimate out the degree of actual potential skew, make the follow-up voltage that remedies defects (offsetvoltage) that carries out correction to carry out smoothly, effectively reach development fundamental purpose of the present invention.
For clearly demonstrating, below carry out the operation of said method with an example, suppose the both positive and negative polarity limit value Vmax of this analog-digital converter 42 earlier, Vmin (for example being positive and negative 5 volts), resolution is 255, and 42 maximal value Dmax=127 that can export of this analog-digital converter and minimum value is Dmin=-127, as for this first current potential L1, this second current potential L2 then is made as the 5*20/127 volt, therefore (shown in Fig. 5 (b)) exports this analog-digital converter 42 to and changes and input to valley value detector 432 in the digital signal processor 43 when this operational amplifier 41 just makes progress translation L1 (this example is the 5*20/127 volt) to control that should the control of Electric potentials signal and with this AC signal after, and then obtain a relative minimum Rmin (for example-125), in addition, this operational amplifier 41 also can be to control that should the control of Electric potentials signal and export the downward translation L2 of this AC signal (this example is the 5*20/127 volt) back (shown in Fig. 5 (c)) to this analog-digital converter 42 and change and input to peak detctor 431 in the digital signal processor 43, and then obtain a relative maximum Rmax (for example 120).At last, tracking balance device 433 in this digital signal processor 43 just can be according to this relative minimum Rmin, this relative maximum Rmax, this first current potential L1, the ultimate value of this second current potential L2 and this analog-digital converter 42 and carry out computing with following formula, the absolute maximum that draws this AC signal is 140, and absolute minimum is-145, and then estimate out the degree (this example is 5/127 volt of (5/2) *) of actual potential skew, make the follow-up voltage that remedies defects that computing is carried out (offset voltage) correction to carry out smoothly, effectively reach development fundamental purpose of the present invention.
The first current potential L1 mapping is to the formula of digital value: L1 * Dmin/Vmin
The second current potential L2 mapping is to the formula of digital value: L2 * Dmax/Vmax
The formula of absolute maximum: Rmax+ (L2 * Dmax/Vmax)
The formula of absolute minimum: Rmin-(L1 * Dmin/Vmin)
The formula of potential shift:
[(absolute maximum+absolute minimum)/2] * Vmax/Dmax or
[(absolute maximum+absolute minimum)/2] * Vmin/Dmin or
[(absolute maximum+absolute minimum)/2] * (| Vmin|+|Vmax|)/(| Dmin|+|Dmax|)
In sum, the inventive method exceeds under the situation of 22 energy range of receiving of analog-digital converter in the intensity of tracking error signal (TE), still can correctly estimate out the degree of actual potential skew, make that the follow-up voltage that remedies defects that carries out (offset voltage) correction can be carried out really, thoroughly improve the disappearance of above-mentioned conventional means, reach development fundamental purpose of the present invention.
Claims (13)
1. the DC potential detection method of an AC signal, be applied on an amplifier, an analog-digital converter and the digital signal processor, this amplifier is exported an AC signal to this analog-digital converter, it is characterized in that, this method comprises the following steps:
(a) make this digital signal processor export a control of Electric potentials signal to this amplifier;
(b) this amplifier is to control that should the control of Electric potentials signal and change exporting this analog-digital converter to behind this AC signal translation one first current potential, and then obtains a relative value;
(c) this digital signal processor draws the absolute value of this AC signal according to the output/input limits value of this relative value, this first current potential and this analog-digital converter; And
(d) this digital signal processor obtains the DC potential intensity of this AC signal according to the absolute value of this AC signal.
2. the DC potential detection method of AC signal as claimed in claim 1 is characterized in that, this step (b) comprising:
(b1) change exporting this analog-digital converter to behind this first current potential of this AC signal translation, and then obtain a relative minimum; And
(b2) change exporting this analog-digital converter to behind this AC signal translation one second current potential, and then obtain a relative maximum.
3. the DC potential detection method of AC signal as claimed in claim 2 is characterized in that, this step (c) comprising:
(c1) this digital signal processor draws the absolute maximum and the absolute minimum of this AC signal according to the output/input limits value of this relative maximum, this relative minimum, this first current potential, this second current potential and this analog-digital converter.
4. the DC potential detection method of AC signal as claimed in claim 3 is characterized in that, this step (d) comprising:
(d1) this digital signal processor DC potential intensity of obtaining this AC signal according to the absolute maximum and the absolute minimum of this AC signal.
5. the DC potential detection method of AC signal as claimed in claim 4, it is characterized in that, the absolute minimum of this AC signal is tried to achieve by following formula: absolute minimum=relative minimum-[first current potential * (output stage limit value/input limits value)], and the absolute maximum of this AC signal is tried to achieve by following formula: absolute maximum=relative maximum+[second current potential * (output stage limit value/input limits value)].
6. the DC potential detection method of AC signal as claimed in claim 5 is characterized in that, this DC potential skew is tried to achieve by following formula:
(absolute maximum+absolute minimum)/2 * Vmax/Dmax or
(absolute maximum+absolute minimum)/2 * Vmin/Dmin or
[(absolute maximum+absolute minimum)/2] * (| Vmin|+|Vmax|)/(| Dmin|+|Dmax|).
7. the DC potential detection method of AC signal as claimed in claim 3, it is characterized in that, comprise the following steps: that also (e) this digital signal processor changes this control of Electric potentials signal to DC potential intensity that should AC signal, and then make this amplifier the DC potential of this AC signal is adjusted into zero control that should the control of Electric potentials signal.
8. a signal detecting method is applied on an amplifier, an analog-digital converter and the digital signal processor, and this amplifier is exported an AC signal to this analog-digital converter, it is characterized in that, this method comprises the following steps:
Make this digital signal processor export a control of Electric potentials signal to this amplifier;
This amplifier is to control that should the control of Electric potentials signal and change exporting this analog-digital converter to behind this AC signal translation one current potential, and then obtains a relative extreme; And
This digital signal processor draws the absolute extremes of this AC signal according to the output/input limits value of this relative extreme, this current potential and this analog-digital converter.
9. signal detecting method as claimed in claim 8, it is characterized in that, the absolute minimum of this AC signal is tried to achieve by following formula: absolute minimum=relative minimum-[current potential * (output stage limit value/input limits value)], and the absolute maximum of this AC signal is tried to achieve by following formula: absolute maximum=relative maximum+[current potential * (output stage limit value/input limits value)].
10. the DC potential offset correction method of an AC signal, be applied on an operational amplifier, an analog-digital converter and the digital signal processor, this amplifier is exported an AC signal to this analog-digital converter, it is characterized in that, this method comprises the following steps:
Make this digital signal processor export a control of Electric potentials signal to this operational amplifier;
This operational amplifier is to control that should the control of Electric potentials signal and change exporting this analog-digital converter to behind downward translation one first current potential of this AC signal, and then obtaining a relative maximum, this relative maximum is positioned at the output/input limits value scope of this analog-digital converter;
This digital signal processor draws the absolute maximum of this AC signal according to the output/input limits value of this relative maximum, this first current potential and this analog-digital converter;
This operational amplifier makes progress to control that should the control of Electric potentials signal and with this AC signal and exports this analog-digital converter to behind translation one second current potential and change, and then obtaining a relative minimum, this relative minimum is positioned at the output/input limits value scope of this analog-digital converter;
This digital signal processor draws the absolute minimum of this AC signal according to the output/input limits value of this relative minimum, this second current potential and this analog-digital converter;
The DC potential skew that this digital signal processor obtains this AC signal according to the absolute maximum and the minimal value of this AC signal; And
Variation according to this this AC signal of DC potential offset correction.
11. the DC potential offset correction method of AC signal as claimed in claim 10, it is characterized in that, the absolute minimum of this AC signal is tried to achieve by following formula: absolute minimum=relative minimum-[first current potential * (output stage limit value/input limits value)], and the absolute maximum of this AC signal is tried to achieve by following formula: absolute maximum=relative maximum+[second current potential * (output stage limit value/input limits value)].
12. the DC potential offset correction method of AC signal as claimed in claim 11 is characterized in that, this DC potential skew is tried to achieve by following formula:
(absolute maximum+absolute minimum)/2 * Vmax/Dmax or
(absolute maximum+absolute minimum)/2 * Vmin/Dmin or
[(absolute maximum+absolute minimum)/2] * (| Vmin|+|Vmax|)/(| Dmin|+|Dmax|).
13. the DC potential offset correction method of AC signal as claimed in claim 10 is characterized in that this operational amplifier, this analog-digital converter and this digital signal processor are arranged in the optical pickup device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021277079A CN1169131C (en) | 2002-08-08 | 2002-08-08 | AC signal detecting method and its DC level level detecting method |
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| CNB021277079A CN1169131C (en) | 2002-08-08 | 2002-08-08 | AC signal detecting method and its DC level level detecting method |
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| CN1399259A CN1399259A (en) | 2003-02-26 |
| CN1169131C true CN1169131C (en) | 2004-09-29 |
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| CN109116095A (en) * | 2018-08-30 | 2019-01-01 | 深圳市德恒科技有限公司 | A kind of digital transmitter |
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Granted publication date: 20040929 Termination date: 20110808 |