CN1271614C - Demodulation method for CD dither signal and equipment thereof - Google Patents
Demodulation method for CD dither signal and equipment thereof Download PDFInfo
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- CN1271614C CN1271614C CN 03150881 CN03150881A CN1271614C CN 1271614 C CN1271614 C CN 1271614C CN 03150881 CN03150881 CN 03150881 CN 03150881 A CN03150881 A CN 03150881A CN 1271614 C CN1271614 C CN 1271614C
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Abstract
The present invention relates to a demodulating device for the shake signal of an optical disc, and a method thereof, which has high practical value. The present invention respectively demodulates an MSK shake sequence corresponding to an MSK shake signal contained in simulating shake signals accessed by the optical disc and a sawtooth shake sequence corresponding to a sawtooth shake signal contained in the simulating dither signals side by side, simultaneously selects and appoints any one of the MSK shake sequence and the sawtooth shake sequence as an original shake data sequence according to the synchronous detection error signal of the shake signals, and demodulates and outputs the original shake data sequence as address information so as to fast and accurately demodulate an ADIP unit shake signal formed by combining MSK shake and sawtooth shake by utilizing a simple digital forming device.
Description
(1) technical field
The invention relates to the demodulation method of CD dither signal and device thereof, specifically be meant about carrying out the demodulation method and the device thereof of the CD dither signal of demodulation to being recorded in the dither signal that is recorded as physical address information on the CDs such as to write down CD or DVD.
(2) background technology
Existing CD-R just can random access or the record position of retrieve data etc. such as will record physical address information on the record surface of DVD-RAM or DVD-RW CDs such as (Re-writable) in advance.Below will be to above-mentioned physical address information is elaborated as the dither signal addressing method that dither signal records CD.
The situation of above-mentioned DVD-RAM at first is described, in order to carry out physical addressing, what use is respectively address information recording to be the CAPA of prefabricated groove (PRE-PIT) form (complementary allocated pit addressing: replenish and distribute the groove address) mode in each sector reference position with each sector.Advantage in such cases is and can carries out addressing respectively to each sector, but shortcoming be for the record real data the data area since address information be that unit carries out record with the sector, the data recording capacity of outcome record real data will reduce.
In addition, under the situation of second generation high density compact disc, a kind of MSK of utilization (minimum shiftkeying: minimum shift keying) the shake addressing mode of dither signal modulation system is proposed recently.Above-mentioned MSK dither signal modulation system, as shown in Figure 1, be to constitute (MM:MSK MARKWOBBLE) by the dullness shake (MW:monotone wobble) of specified shake length (NWL:nominal wobble length) and the MSK MARK shake of 3 NWL sizes.
In addition, as shown in Figure 1, specified shake length (NWL1, NWL2, NWL6, the phase place of the dither signal of the specified shake length N WL4 of dull dither signal NWL7) (MW:monotone wobble) and formation MSK MARK shake is just in time opposite.The dither signal phase place of the specified shake length N WL5 of the dither signal of the specified shake length N WL3 of formation MSK MARK shake and formation MSK MARK shake is opposite.
And, above-mentioned specified shake length (NWL1, NWL2, NWL6, dull dither signal NWL7) (MW:monotone wobble) has identical chattering frequency (f with the dither signal of the specified shake length N WL4 that constitutes MSK MARK shake
Wob), constituting the specified shake length N WL3 that MSK MARK shakes, the dither signal of NWL5, its frequency are higher than above-mentioned dither signal frequency (f
Wob), be 1.5*f
Wob
Above-mentioned MSK jitter modulation mode is constituted by frequency and all mutually different 4 dither signals altogether of phase place.Propose a kind of new method recently again, utilizing in the middle of the shake addressing mode of MSK jitter modulation, convert the part of the dull dither signal of Fig. 1 to as shown in Figure 2 sawtooth dither signal (SAW-TOOTHWOBBLE), show information specific.
In addition, in the middle of the above-mentioned sawtooth dither signal, such as, plural specified shake length (NWL2, NWL3), can show the information of " 0 " and " 1 " according to continuous dither signal, have opposite phases corresponding to the dither signal of the zigzag fashion of above-mentioned " 0 " and " 1 " with same phase place and zigzag fashion.
Like this, added in the MSK jitter modulation addressing mode of sawtooth dither signal, as shown in Figure 3, ADIP (address in pre-groove word: pre-groove address) unit (unit), promptly dull unit (monotone unit), the initial reference unit of data (reference unit) by 8 types, synchronization signal unit (sync 0-3), data cell (data 0,1), the represents physical addressing information.
In addition, above-mentioned each unit has 56 specified shake length (NWL 0-55) altogether, the the 1st to the 3rd specified shake length (NWL0-2) of each unit is made of MSK MARK WOBBLE respectively, at this moment, the the 1st to the 3rd specified shake length (NWL0-2) and the 15th to the 17th specified shake length (NWL14-16) of the data cell (DATA0) of representative " 0 " are made of MSK MARK WOBBLE, the the 19th to the 55th specified shake length (NWL18-54) is by constituting with the corresponding sawtooth dither signal in ' 0 ', simultaneously, a remaining specified shake length constitutes dull shake.
On the contrary, the the 1st to the 3rd specified shake length (NWL0-2) and the 15th to the 17th specified shake length (NWL14-16) of the data cell (DATA1) of the data cell (data1) of performance ' 1 ' are made of MSK MARK WOBBLE, the the 19th to the 55th specified shake length (NWL18-54) is by constituting with the corresponding sawtooth dither signal in ' 1 ', simultaneously, a remaining specified shake length constitutes dull shake.
In addition, read above-mentioned MSK (minimum shift keying) dither signal and sawtooth dither signal (SAW-TOOTH WOBBLE), and with its CD dither signal demodulating equipment that is demodulated into physical address information as shown in Figure 4, comprising from CD:
Simulating signal interval integral device 11 according to (reset) pulse that resets, is divided into some intervals respectively with MSK dither signal and sawtooth dither signal;
The the 1st and the 2nd sampling supporter (12,13) is used for MSK dither signal and sawtooth dither signal interval integral value are sampled respectively, within a certain period of time, such as to accumulating in 56 specified shake length (NWL0-55) interval altogether.
In addition, also comprise:
MSK dither signal determination portion 14 according to the aggregate value method of weighting score value of the MSK dither signal of exporting from above-mentioned the 1st sampling supporter (12), is determined the sequence of output and MSK dither signal corresponding " 0 " or " 1 ";
Sawtooth dither signal determination portion 17 according to the aggregate value method of weighting score value of the sawtooth dither signal of exporting from above-mentioned the 2nd sampling supporter (13), is determined the sequence of output and sawtooth dither signal corresponding " 0 " or " 1 ";
MSK/ sawtooth dither signal determination portion 16, according to after exporting respectively from the above-mentioned the 1st and the 2nd sampling support sector 12,13, simulated cumulative integral value that frequency mixer 15 mixing obtain and, determine the sequence of output MSK dither signal and sawtooth dither signal corresponding " 0 " and " 1 ".
Therefore, the demodulating equipment of above-mentioned CD dither signal is to utilize Analogue mixer 10, simulating signal interval integral device 11, the the 1st and the 2nd sampling supporter 12,13, detect the corresponding aggregate value method of weighting score value of MSK dither signal and sawtooth dither signal, utilize above-mentioned each dither signal determination portion 14,16,17, determine the sequence of output and this aggregate value method of weighting score value corresponding " 0 " and " 1 ".Therefore, as with reference to shown in Figure 3, have altogether to what MSK dither signal and the combination of sawtooth dither signal obtained that the physical address information of the ADIP unit of 8 types of 56 specified shake length (NWL0-55) carries out demodulation and output.
But, need Analogue mixer for this reason, the interval integral device, and constituent apparatus such as simulation such as sampling supporter etc., so will cause the complicated of demodulating equipment and maximization, in addition, for the sawtooth dither signal is carried out demodulation, need all carry out integration successively to 56 the specified shake length (NWL0-55) altogether that constitute an ADIP unit, so just have long problem of demodulation time.
(3) summary of the invention
Therefore, the present invention carries out in order to address the above problem just.The object of the present invention is to provide a kind of demodulation method and device thereof of CD dither signal, it can utilize simple numerical constituent apparatus rapid demodulation MSK dither signal and sawtooth dither signal to make up the dither signal of the ADIP unit that obtains.
To achieve these goals, the demodulation method of CD dither signal of the present invention is characterized in comprising following operating process:
Phase one, detect side by side the sawtooth dither signal sequence that comprises in MSK dither signal corresponding MSK dither signal sequence that generation comprises and the above-mentioned analog dither signal respectively from the analog dither signal that CD is read;
Subordinate phase according to the detection case of the synchronous mode that sets in advance, is selected any one in definite above-mentioned difference arranged side by side detected MSK dither signal sequence and the sawtooth dither signal sequence, is demodulated into original shake data sequence;
Wherein, in the above-mentioned MSK jitter sequences generative process of reference, when detected bit clock can not normally detect under the situation of predefined synchronous mode, the synchronous detection rub-out signal of above-mentioned dither signal will take place, in the MSK jitter sequences generative process in the above-mentioned subordinate phase, when the synchronous detection rub-out signal of dither signal takes place, select to determine above-mentioned sawtooth jitter sequences, then it is demodulated into original shake data sequence.
In addition, to achieve these goals, the demodulating equipment of CD dither signal of the present invention is characterized in comprising with lower device:
The 1st sequence generator generates the MSK dither signal sequence of the simulating signal that reads from CD, and the 1st sequence generator comprises the 1st bandpass filter;
The 2nd sequence generator generates the sawtooth dither signal sequence of above-mentioned analog dither signal, and the 2nd sequence generator comprises the 2nd bandpass filter and amplitude detector;
Determine device, select in definite above-mentioned MSK dither signal sequence and the sawtooth dither signal sequence any one, this determines that device comprises the sequence determiner;
Demodulating equipment is demodulated into original shake data sequence with the sequence of selecting to determine, this demodulating equipment comprises address decoder at least;
Wherein, with reference to detected bit clock in the bit detector of above-mentioned the 1st sequence generator, under the synchronous mode that sets in advance can not normal detected situation, just produce the synchronous detection rub-out signal of dither signal, described sequence is determined device when the synchronizing indicator of above-mentioned the 1st sequence generator produces the synchronous detection rub-out signal of dither signal, and the output of above-mentioned sawtooth jitter sequences is determined in selection.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
(4) description of drawings
Fig. 1 is the oscillogram of existing MSK dither signal.
Fig. 2 is the oscillogram of existing sawtooth dither signal.
Fig. 3 is the type map of ADIP (the Address in pre-groove word) unit of existing MSK dither signal and the performance of sawtooth dither signal.
Fig. 4 is the part-structure figure of the analog demodulator device of existing CD dither signal.
Fig. 5 is the pie graph of the demodulating equipment of CD dither signal of the present invention.
Fig. 6 detects for the demodulation method by CD dither signal of the present invention and each signal and the MSK of demodulation shake data plot.
Fig. 7 and Fig. 8 detect for the demodulation method by CD dither signal of the present invention and each signal and the sawtooth of demodulation are shaken data plot.
(5) embodiment
At first, the demodulation method of CD dither signal of the present invention and device thereof, the Korean Patent Application No. of having carried out patented claim according to the applicant is the 02-007943 number (applying date: the dither signal demodulation mode that is described in detail in the patent document on February 14th, 2002), utilize peak detection (PEAKDETECTION) mode to carry out MSK dither signal that precoding (pre-coding) and modulation record CD when carrying out demodulation, utilize bandpass filter shown in the present (BPF) and the amplitude detector (level detector) etc. simply to carrying out demodulation referring to figs. 1 through the described sawtooth dither signal of Fig. 3.Below with reference to accompanying drawings the demodulation method of CD dither signal of the present invention and the specific embodiment of device thereof are elaborated.
Fig. 5 is the structural drawing of the demodulating equipment of CD dither signal of the present invention.Above-mentioned demodulating equipment comprises the 1st and the 2nd bandpass filter (BPF1 and BPF2) 20,27, A/D converter (ADC) 21, slope detector 22, peak detctor 23, clock detector 24, bit detector 25, sequence determiner 26, amplitude detector 28, address decoder 29, synchronizing indicator 30.The analog dither signal of recommending (PUSH-PULL) signal that above-mentioned the 1st bandpass filter 20 reads CD, such as, according to Korean Patent Application No. is that the dither signal modulation system recorded and narrated in detail in 02-007943 number is modulated the MSK dither signal of record and referring to figs. 1 through the analog dither signal of the ADIP unit that is constituted by the sawtooth dither signal shown in Figure 3, with the corresponding (Wc=f of above-mentioned MSK dither signal frequency
Wob, 1.5*f
Wob) frequency band is logical carries out filtering, remove high frequency interference and become to grade.Above-mentioned A/D converter 21 converts above-mentioned analog dither signal through bandpass filtering to digital jitter signal.
Then, above-mentioned slope detector 22 monitors the slope of the digital jitter signal that the above-mentioned A/D converter 21 of detection is converted to.The slope that above-mentioned peak detctor 23 obtains above-mentioned detection from negative value be converted on the occasion of fulcrum as the minimum peak point, the slope that above-mentioned detection is obtained from the occasion of the fulcrum that is converted to negative value as maximal peak point, and output peak detection signal correspondingly.
Such as, as shown in Figure 6, the exclusive disjunction computing is carried out in ' 010011011 ' with original Bit data, after carrying out precoding (PRE-CODING) then, the data that this precoding obtains become ' 110100110 ', when this was analog dither signal according to the 1st frequency and the 2nd frequency modulation (PFM), the opposite or unified pulse waveform of amplitude of initial, peak and end of a period peak value will appear.
Therefore, the peak detection signal of above-mentioned peak detctor 23 outputs, the cycle of its amplitude migration point has two kinds of different cycles mutually, this moment, above-mentioned clock detector 24 detected the cycle of this amplitude migration point respectively, detect the bit clock signal of output some cycles, this some cycles is the lowest common multiple in these two variety classes cycles.
In addition, the bit clock signal of above-mentioned some cycles, as shown in Figure 6, its cycle is identical with the cycle of the bitswap point of original shake Bit data, above-mentioned bit-detector 25 detects the amplitude of the peak detection signal of confirming that above-mentioned peak detctor 23 detects in the drop edge of above-mentioned bit clock signal.
At this moment, above-mentioned bit detector 25 detects " 0 " shake data in the drop edge of above-mentioned detected bit clock signal if the amplitude of above-mentioned peak detection signal is low, if high, detects " 1 " shake data.
Therefore, above-mentioned address decoder 29 decoding outputs, the shake data sequence as address information is exported by demodulation as shown in Figure 6, is demodulated into the value with identical ' 01001111011 ' of original MSK shake data sequence.
In addition, referring to figs. 1 through sawtooth dither signal shown in Figure 3, such as shown in Figure 7, optical disc reading signal is for having
cos(2π*(f
wob)*t)-α*sin(2π*(2*f
wob)*t)
Frequency and phase place, during corresponding to the sawtooth dither signal of ' 0 ', this sawtooth dither signal is being transported to the 2nd bandpass filter 27 later on removing radio-frequency components by above-mentioned the 1st bandpass filter 20.
At this moment, with ' 1 ' respective saw teeth dither signal, such as shown in Figure 8, have
cos(2π*(f
wob)*t)+α*sin(2π*(2*f
wob)*t)
Frequency and phase place, with ' 1 ' respective saw teeth dither signal is to be transported to the 2nd bandpass filter 27 again after above-mentioned the 1st bandpass filter 20 of process has been removed radio-frequency component, and the result is that the dither signal of having removed the waveform much at one of sawtooth composition is transported to above-mentioned the 2nd bandpass filter 27.
That is, take out the radio-frequency component of the zig-zag that can distinguish ' 0 ' and ' 1 ', the dither signal of waveform much at one is transported to above-mentioned the 2nd bandpass filter 27 by above-mentioned the 1st bandpass filter 20.
But, be transported to above-mentioned the 2nd bandpass filter 27 with the corresponding (Wc=f of sawtooth chattering frequency
Wob, 2*f
Wob) frequency band is logical when carrying out filtering, carries out phase shifts 90 degree, therefore, according to the corresponding sawtooth dither signal in ' 1 '
+α*sin(2π*(2*f
wob)*t)
With with the corresponding sawtooth dither signal in ' 0 '
-α*sin(2π*(2*f
wob)*t)
As shown in Figure 7 and Figure 8, carry waveform to amplitude detector 28 with mutual out of phase.
In addition, above-mentioned amplitude detector 28 detects the amplitude of the sawtooth dither signal of confirming 27 outputs of above-mentioned the 2nd bandpass filter in rising/drop edge (Rising/falling edge) of detecting the peak detection signal of output from above-mentioned peak detctor 23.
At this moment, when the amplitude of the sawtooth dither signal of above-mentioned the 2nd bandpass filter 27 output is high amplitude, will carry ' 1 ' to sequence determiner 26, thereby above-mentioned sequence determiner 26 just can be judged above-mentioned sawtooth dither signal and is and the corresponding shake data in ' 0 ' corresponding to high amplitude.
On the contrary, when the amplitude of the sawtooth dither signal of above-mentioned the 2nd bandpass filter 27 output is short arc, will carry ' 0 ' to sequence determiner 26, thereby above-mentioned sequence determiner 26 just can be judged above-mentioned sawtooth dither signal and is and the corresponding shake data in ' 1 ' corresponding to high amplitude.
Therefore, above-mentioned sequence determiner 26 is according to the MSK jitter sequences of above-mentioned amplitude detector 28 detected sawtooth jitter sequences and 25 outputs of above-mentioned bit detector, and determining will be to the shake data sequence of above-mentioned address decoder 29 conveyings.
In addition, above-mentioned synchronized signal detector 30 with reference to above-mentioned bit clock, detects from the bit clock of the some cycles of above-mentioned bit detector 25 outputs, such as the synchronous mode (Pattern) of 56 lock unit as shown in Figure 1 to Figure 3.When above-mentioned synchronous mode can not correctly be detected, such as, cause in the time of correctly to detect synchronous mode, above-mentioned synchronous detection rub-out signal is transported to above-mentioned sequence determiner 26 because there is the part defective in CD.
And, when above-mentioned sequence determiner 26 receives above-mentioned synchronous detection rub-out signal, mistake has taken place in the MSK dither signal of judging this initial point input, and the sawtooth jitter sequences that this moment above-mentioned amplitude detector 28 is detected output selects to be defined as being transported to the shake data sequence of above-mentioned address decoder 29.
Promptly, above-mentioned sequence determiner 26 is selected definite MSK jitter sequences from above-mentioned bit detector 25 outputs, in the process that is transported to above-mentioned address decoder 29, when if the synchronous detection rub-out signal appears in above-mentioned synchronizing indicator 30, select to determine the sawtooth jitter sequences of above-mentioned amplitude detector 28 outputs from this point, be transported to above-mentioned address decoder 29 then.Thereby, as previously mentioned, there is not correct detected MSK jitter sequences to be demodulated into original shake data under the state that can prevent to take place, so can realize shaking accurately data demodulates in the synchronous detection mistake.
In addition, above-mentioned sequence determiner 26 only confirms that from ' 0 ' the sequence of above-mentioned amplitude detector 28 continuous detecting output or the part the sequence of ' 1 ' still ' 0 ' is corresponding with ' 1 ' just can to judge the sawtooth dither signal rapidly.
The demodulating equipment of CD dither signal of the present invention and method thereof have very high practical value.The pairing sawtooth jitter sequences of sawtooth dither signal that comprises in pairing MSK jitter sequences of the MSK dither signal that comprises in the analog dither signal that CD is read and the above-mentioned analog dither signal is carried out side by side in the demodulation respectively, synchronous detection rub-out signal according to dither signal, any one sequence selection in above-mentioned MSK jitter sequences and the sawtooth jitter sequences is appointed as original shake data sequence, demodulation is output as address information then, thereby the dither signal that can realize utilizing the simple numerical constituent apparatus accurately MSK shake and sawtooth to be shaken the ADIP unit that constitutes is rapidly carried out demodulation.
Though the present invention describes with reference to current specific embodiment, but those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, should understand and wherein can make variations and modifications and do not break away from the present invention in a broad sense, so be not as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the distortion of the above embodiment.
Claims (6)
1. the demodulating equipment of a CD dither signal is characterized in that comprising with lower device:
The 1st sequence generator generates the MSK dither signal sequence of the simulating signal that reads from CD, and the 1st sequence generator comprises the 1st bandpass filter;
The 2nd sequence generator generates the sawtooth dither signal sequence of above-mentioned analog dither signal, and the 2nd sequence generator comprises the 2nd bandpass filter and amplitude detector;
Determine device, select in definite above-mentioned MSK dither signal sequence and the sawtooth dither signal sequence any one, this determines that device comprises the sequence determiner;
Demodulating equipment is demodulated into original shake data sequence with the sequence of selecting to determine, this demodulating equipment comprises address decoder at least;
Wherein, with reference to detected bit clock in the bit detector of above-mentioned the 1st sequence generator, under the synchronous mode that sets in advance can not normal detected situation, just produce the synchronous detection rub-out signal of dither signal, described sequence is determined device when the synchronizing indicator of above-mentioned the 1st sequence generator produces the synchronous detection rub-out signal of dither signal, and the output of above-mentioned sawtooth jitter sequences is determined in selection.
2. the demodulating equipment of CD dither signal as claimed in claim 1 is characterized in that: above-mentioned the 1st sequence generator comprises having (Wc=f
Wob, 1.5*f
Wob) the 1st logical bandpass filter of frequency band.
3. the demodulating equipment of CD dither signal as claimed in claim 2 is characterized in that: above-mentioned the 2nd sequence generator comprises the 2nd bandpass filter, will by above-mentioned the 1st bandpass filter and output dither signal with (Wc=f
Wob, 2*f
Wob) frequency band logical carry out filtering, simultaneously with phase shifts 90 degree of above-mentioned dither signal.
4. as the demodulating equipment of claim 1 or 3 described CD dither signals, it is characterized in that: above-mentioned the 2nd sequence generator comprises amplitude detector, the amplitude of confirming by the dither signal of above-mentioned the 2nd bandpass filter is detected in rising/drop edge in the detected peak detection signal of peak detctor of above-mentioned the 1st sequence generator, export ' 0 ' or ' 1 ' sequence.
5. the demodulation method of a CD dither signal is characterized in that comprising following operating process:
Phase one, detect side by side the sawtooth dither signal sequence that comprises in MSK dither signal corresponding MSK dither signal sequence that generation comprises and the above-mentioned analog dither signal respectively from the analog dither signal that CD is read;
Subordinate phase according to the detection case of the synchronous mode that sets in advance, is selected any one in definite above-mentioned difference arranged side by side detected MSK dither signal sequence and the sawtooth dither signal sequence, is demodulated into original shake data sequence;
Wherein, in the above-mentioned MSK jitter sequences generative process of reference, when detected bit clock can not normally detect under the situation of predefined synchronous mode, the synchronous detection rub-out signal of above-mentioned dither signal will take place, in the MSK jitter sequences generative process in the above-mentioned subordinate phase, when the synchronous detection rub-out signal of dither signal takes place, select to determine above-mentioned sawtooth jitter sequences, then it is demodulated into original shake data sequence.
6. the demodulating equipment of CD dither signal as claimed in claim 5 is characterized in that: above-mentioned sawtooth jitter sequences has (Wc=f in process
Wob, 1.5*f
Wob) logical the 1st bandpass filter and the (Wc=f of frequency band
Wob, 2*f
Wob) the logical bandpass filtering that carries out of frequency band, after affirmation is detected in rising/drop edge of simultaneously amplitude of the dither signal exported after the 2nd bandpass filter of this dither signal by phase shifts 90 degree being detected the peak detection signal of exporting in the process of above-mentioned MSK jitter sequences, export with " 0 " or " 1 " sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03150881 CN1271614C (en) | 2003-09-10 | 2003-09-10 | Demodulation method for CD dither signal and equipment thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03150881 CN1271614C (en) | 2003-09-10 | 2003-09-10 | Demodulation method for CD dither signal and equipment thereof |
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|---|---|
| CN1595507A CN1595507A (en) | 2005-03-16 |
| CN1271614C true CN1271614C (en) | 2006-08-23 |
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ID=34659772
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| CN 03150881 Expired - Fee Related CN1271614C (en) | 2003-09-10 | 2003-09-10 | Demodulation method for CD dither signal and equipment thereof |
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