CN1206904A - Pre concave groove testing device and method - Google Patents
Pre concave groove testing device and method Download PDFInfo
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- CN1206904A CN1206904A CN 98114917 CN98114917A CN1206904A CN 1206904 A CN1206904 A CN 1206904A CN 98114917 CN98114917 CN 98114917 CN 98114917 A CN98114917 A CN 98114917A CN 1206904 A CN1206904 A CN 1206904A
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Abstract
A pre-pit is detected by a pre-pit detecting apparatus when recording record information onto a record medium. The pre-pit detecting apparatus is provided with: a light pickup device; a wobbling signal extracting device for extracting a wobbling signal, which indicates the moving control information, out of the outputted reproduction signal; a synchronization signal generating device; a modulating device for amplitude-modulating the outputted reproduction signal with the generated synchronization signal; and a detecting device for comparing the amplitude-modulated reproduction signal with a predetermined reference signal and outputting a pre-pit detection signal.
Description
The present invention relates to a kind of information record carrier, this device is used for by being used for the address information or the synchronizing signal of retrieval by window during recorded information or reproducing the Spin Control information of the Spin Control that (ii) is used for recording medium at record in WO described later (write-once) type recording medium (i), as a swing (WOBBLING) signal etc. (after this, with these information as " pre-information "), write down such as video information, the recorded information of audio-frequency information etc. and so on, wherein in the highly dense recording medium that has thorough improved DVD to represent with recording density CD (CD) commonly used, pre-information is recorded on the WO type recording medium (being called DVD-R (recordable DVD) thereafter) in advance.Particularly, the present invention relates to a kind of pre concave groove testing device that is formed at the pre-groove (PRE-PIT) on DVD-R etc. at such information record carrier that is used for detecting.
Existing a kind of cd cd-R (can write down CD) has the recording capacity that is similar to CD, and pre-information is recorded on the CD-R in advance, and according to this pre-information, information described later is recorded thereon.
In CD-R, in the pre-formatting step of making CD-R, the information tracks (flute profile session or plane session) of record recorded information becomes a waveform with one corresponding in advance the signal that will write down pre-information being carried out the warble that FM modulates (frequency modulation (PFM)), makes pre-information be recorded.
When recorded information is recorded on the existing C D-R really, detect by the hunting frequency of swing session.Extract the standard time clock of Spin Control CD-R according to testing result.Produce a drive signal that is used for the Spindle Motor of rotation CD-R is rotated control according to the standard time clock that extracts.Produce a clock signal with the synchronous timing information of the rotation of CD-R of comprising that is used for recording operation.
And as the address information that is illustrated in record address on required CD-R during recorded information, pre-information is reproduced when the record recorded information.Then, according to reproduced pre-information, detect a position that is recorded, to write down recorded information by this.
But, owing to put forward requirement of high recording density, make at the interval between the information tracks adjacent on the above-mentioned DVD-R approximately just half on the CD-R.Thereby, obtain under the situation of pre-information in the information tracks of attempting by swinging in the mode that is same as existing swinging technique on the DVD-R, accurately the wobble detection signal is difficult, because the swinging signal of neighbor information session interferes with each other.
Therefore, in above-mentioned DVD-R, swing a information tracks (for example, a flute profile session) among the DVD-R, make Spin Control information be recorded thereon with a frequency based on standard time clock.In addition, write down pre-information by forming one corresponding to pre-groove in the pre-information on a session between two information tracks (for example, plane session).And, in order from pre-groove, to reproduce standard time clock when needed, on the whole recording surface of DVD-R, be formed uniformly pre-groove substantially.
By this way, obtain pre-information, make and carry out Spin Control and record controls exactly according to this pre-information by detecting so pre-groove.
Incidentally, carry out the detection of pre-groove in the following manner.
That is, at first, produce a gating signal as shown in Figure 8, it is synchronized with a signal that has comprised a hunting frequency component (after this, being referred to as " swinging signal ") that is obtained by the light beam irradiates information tracks.
Then, relatively this swinging signal and a predetermined threshold value signal extract a component of signal of the swinging signal that has surpassed threshold value.
Then, calculate this signal that extracts and gating signal logic product, extract the pre-groove signal that is superimposed upon on the swinging signal.
Therefore, in swinging signal, comprise under the situation of noise, because differential too little corresponding between another part of the signal section of pre-groove and swinging signal, so that noise component is mistakenly detected as pre-groove detection signal.
The present invention promptly proposes at the problems referred to above.Therefore an object of the present invention is to provide the apparatus and method of a pre-groove signal of a kind of detection, even a noise component is superimposed on the swinging signal, it also can detect this pre-groove signal exactly.
Realize above-mentioned purpose of the present invention by a pre concave groove testing device, when being used on recorded information being recorded a recording medium, described pre concave groove testing device detects a pre-groove, wherein pass through with a information tracks of warble corresponding to mobile control information, make the mobile control information be used for when recorded information being recorded on the described recording medium, controlling the translational speed of described recording medium be recorded to recording medium, and by forming pre-groove, feasiblely be used to control the record controls information that recorded information is recorded on the described recording medium and also recorded recording medium in advance with the relevant predetermined phase (PHASE) of information tracks of swing.Pre concave groove testing device comprises: a light picker, be used on described information tracks and adjacent session, launching light beam simultaneously adjacent to this information tracks, and according to the reproducing signal of light output from described information tracks and described adjacent session reflection; A swinging signal extracts equipment, is used for extracting from the reproducing signal of output the swinging signal of the mobile control information of expression; A synchronizing signal generation equipment is used to produce a synchronizing signal, and consistent with the swinging signal that extracts respectively and its peak swing position of its phase place and frequency is set to be superimposed upon a position of the pre-groove signal on the swinging signal; A modulating equipment is used to utilize the synchronizing signal of generation that the reproducing signal of exporting is carried out amplitude modulation(PAM); And a checkout equipment, be used for reproducing signal and a predetermined reference signal of comparison amplitude modulation, and export a pre-groove detection signal.
According to pre concave groove testing device of the present invention, optical pickup apparatus is launched light beam simultaneously on information tracks and adjacent session, and according to the reflected light of emission light beam from information tracks and adjacent session, by optical pickup apparatus output reproducing signal.Then, swinging signal extracts equipment extracts the mobile control information of expression from the reproducing signal of output swinging signal.This swinging signal that extracts not only is used to obtain mobile control information, and is used to produce synchronizing signal.Synchronization signal generating apparatus produces synchronizing signal, and phase place and the frequency with the swinging signal that extracts is consistent respectively with frequency for its phase place, and its peak swing position is arranged on pre-groove signal is superimposed upon position on the swinging signal.Then, the synchronizing signal of modulating equipment utilization generation is carried out amplitude modulation(PAM) to the reproducing signal of output.By amplitude modulation, the amplitude of the second portion reproducing signal of the first's reproducing signal rather than the pre-groove signal that superposeed reduces, and makes to strengthen or increase the second portion reproducing signal relatively in reproducing signal.At last, reproducing signal and the predetermined reference signal after the amplitude modulation relatively, and export pre-groove detection signal by checkout equipment.Like this, guaranteed the comparison of the second portion reproducing signal (pre-groove signal has superposeed on it) emphasized and reference signal, made and from pre concave groove testing device of the present invention, can export the pre-groove detection signal that is accurately detected.
By this way, even under the situation of noise component that superposeed on the reproducing signal, still can accurately detect pre-groove signal.
Aspect of pre concave groove testing device, predetermined reference signal is the signal that obtains by the DC voltage that one of stack on the swinging signal that extracts has a scheduled voltage.
In view of the above, even under the situation that the output of the swinging signal that extracts changes owing to the influence of adjacent session, still can change and accurately detect pre-groove detection signal by eliminating this.
Aspect another of pre concave groove testing device, record controls information comprises the record position information that is used to represent the record position of recorded information on recording medium.
In view of the above, in the record recorded information, the translational speed of controlling recording medium and the position of recorded information on recording medium that can utilize record position information to discern exactly will to be recorded make and write down this recorded information exactly when accurately detecting pre-groove detection signal exactly.
Aspect another of pre concave groove testing device, recording medium can be a DVD as DVD-R.
In view of the above, can control the rotation of DVD exactly, and when accurately detecting pre-groove detection signal, this recorded information is recorded on the DVD.
Aspect another of pre concave groove testing device, in information tracks and the adjacent session one is formed at one of plane session on the recording medium and flute profile session, and in information tracks and the adjacent session another is plane session and in the flute profile session another that is formed on the recording medium.
In view of the above, optical pickup apparatus is launched light beam simultaneously on information tracks and adjacent session, and according to the reflected light of emission light beam from information tracks and adjacent session, by optical pickup apparatus output reproducing signal.Therefore, even be recorded on the plane session (or flute profile session), also can when accurately detecting pre-groove detection signal, recorded information be recorded on the flute profile session (or plane session) in record controls information.
Above-mentioned purpose of the present invention can realize by a kind of pre-groove detection method that detects a pre-groove on recorded information being recorded a recording medium time, wherein by information tracks of swing, when being used for writing down this recorded information on recording medium, record controls the mobile control information of described recording medium translational speed, and corresponding to this frequency that moves control information recorded information is recorded on the described recording medium, and by forming pre-groove and on described recording medium, write down the record controls information that is used for this recorded information of controlling recording in advance at a predetermined phase relevant with the information tracks of being swung with one.This pre-groove detection method comprises: a light picks up step, be used on described information tracks and adjacent session, launching light beam simultaneously adjacent to this information tracks, and according to the reproducing signal of light output from described information tracks and described adjacent session reflection; A swinging signal extraction step is used to extract the swinging signal of the mobile control information of expression outside the reproducing signal of output; A synchronizing signal generation step is used to produce a synchronizing signal, and consistent with the swinging signal that extracts respectively and its peak swing position of its phase place and frequency is set to be superimposed upon a position of the pre-groove signal on the swinging signal; A modulation step is used to utilize the synchronizing signal of generation that the reproducing signal of exporting is carried out amplitude modulation(PAM); And a detection step, be used for reproducing signal and a predetermined reference signal of comparison amplitude modulation, and export a pre-groove detection signal.
According to pre-groove detection method of the present invention, pick up in the step at light and on information tracks and adjacent session, to launch light beam simultaneously, and, reproducing signal is outputed to light pick up step according to the reflected light of emission light beam from information tracks and adjacent session.Then, in the swinging signal extraction step, from the reproducing signal of output, extract swinging signal.In the synchronizing signal generation step, produce synchronizing signal then.Then, in modulation step, utilize the synchronizing signal that produces that the reproducing signal of exporting is carried out amplitude modulation(PAM).At last, reproducing signal and predetermined reference signal after the comparison amplitude modulation, and pre-groove detection signal is output to the detection step.
By this way, even under the situation of noise component that superposeed on the reproducing signal, still can accurately detect pre-groove signal.
Aspect of pre-groove detection method, predetermined reference signal is to have the signal that the DC voltage of scheduled voltage obtains by one of stack on the swinging signal that extracts.
Aspect another of pre-groove detection method, record controls information comprises the record position information that is used to represent the record position of information on recording medium that will be recorded.
Aspect another of pre-groove detection method, recording medium can be a DVD as DVD-R.
Aspect another of pre-groove detection method, in information tracks and the adjacent session one is formed at one of plane session on the recording medium and flute profile session, and in information tracks and the adjacent session another is plane session and in the flute profile session another that is formed on the recording medium.
From the detailed description of following most preferred embodiment to the reference accompanying drawing, can be more clearly visible feature of the present invention.
Fig. 1 is the structure skeleton view that DVD-R is in one embodiment used in expression;
Fig. 2 is the record format synoptic diagram that DVD-R is in one embodiment used in expression;
Fig. 3 is the block diagram of information record carrier among the expression embodiment;
Fig. 4 is the concrete structure block scheme of a pre-groove signal demoder among the expression embodiment;
Fig. 5 is the concrete structure block scheme that expression is used for exporting to the pre-groove signal demoder of Fig. 4 the servo circuit of a synchronous signal;
Fig. 6 is the sequential chart of the waveform of various signals in the pre-groove signal demoder of representing among the embodiment;
Fig. 7 is the waveform sequential chart that expression is used to illustrate the various signals of amplitude modulation(PAM); And
Fig. 8 is the sequential chart of the waveform of a reproducing signal of expression and a gating signal, is used for detecting according to description of Related Art the method for a pre-groove signal.
Most preferred embodiment of the present invention is described with reference to the accompanying drawings.
At first, with reference to Fig. 1 and 2, with DVD-R is that example describes the recording medium that is used for embodiment, corresponding to as the pre-information of record controls information and on recording medium, formed a pre-groove, and, Spin Control information is recorded on the recording medium by with flute profile session described later of a predetermined warble.
The structure of DVD-R at first, is described with reference to Fig. 1.
In Fig. 1, DVD-R1 is a variable color (PIGMENT) type DVD-R, and it has one deck variable color film 5 and information can only be by write-once.In DVD-R1, formed one as the flute profile session 2 of information tracks and one as the plane session 3 of adjacent session so that light beam B such as laser beam etc. are directed to flute profile session 2 as playback light or recording light.And DVD-R1 has: one deck is used to protect the diaphragm 7 of flute profile session 2 and plane session 3; And precipitated metal surface 6 that is used for folded light beam B when reproducing recorded information.On plane session 3, formed pre-groove 4 corresponding to pre-information.Each pre-groove 4 is preformed before the DVD-R1 shipment.
And, in DVD-R1, with a warble flute profile session 2 corresponding to the rotational speed of DVD-R1.Similar to pre-groove 4, also before the DVD-R1 shipment, carry out in advance by the Spin Control recording of information operation that swing flute profile session 2 carries out.
When recording recorded information (comprising) on the DVD-R1 such as video information, audio-frequency information and other information that is recorded except that pre-information and Spin Control information, the hunting frequency that is detected flute profile session 2 by an information record carrier described later to be obtaining Spin Control information, and with the rotation of a predetermined rotational speed control DVD-R1.And, detect pre-groove 4 and obtain pre-information in advance, and according to the pre-information setting of this acquisition with noting down or the best output of the light beam B of playback light.And acquisition is used for representing the address information of the record position of recorded information on DVD-R1.According to the address information that obtains this recorded information is recorded on the corresponding record position then.
When the record recorded information, send light beam B the center of its center and flute profile session 2 is consistent.Then, on flute profile session 2, form recorded information groove corresponding to this recorded information to write down this recorded information.At this moment, the size that luminous point SP is set not only is mapped on the flute profile session 2 part of luminous point SP, but also is mapped on the plane session 3, and as shown in Figure 1 one.Then, utilize the reflected light of luminous point SP on plane session 3 to come from pre-groove 4, to detect pre-information by a kind of push-and-pull method (a kind of push-and-pull method (after this being referred to as " radially push-and-pull method ") of utilizing the photodetector that a quilt cut-off rule parallel with the sense of rotation of DVD-R1 cuts apart), to obtain pre-information.And, utilize the reflected light of luminous point SP on flute profile session 2 to come wobble detection signal from flute profile session 2, thereby obtain to be used for a clock signal of Spin Control.
Pre-information and the Spin Control recording of information form that is recorded in advance in the present embodiment on the DVD-R1 is described below with reference to Fig. 2.In Fig. 2, top data block shows the record format of recorded information, each waveform that is positioned at following data block shows the swing state planimetric map of flute profile session 2 (promptly corresponding to) of the flute profile session 2 of record recorded information, and shows the formation position of pre-groove 4 respectively towards upward arrow between the swing state of flute profile session 2 and recorded information.In Fig. 2, for the purpose of easy to understand, utilized the amplitude that is higher than actual amplitude to represent the swing state of flute profile session 2.Recorded information is recorded on the center line of flute profile session 2.
As shown in Figure 2, the recorded information that will be recorded on the DVD-R1 is divided into synchronization frame in advance, and each synchronization frame is as a message unit.A record sector is made of 26 synchronization frames.And an ECC (error correcting code) data block is made of 16 record sectors.The length of a synchronization frame equals 1488 times (1488T) corresponding to the unit length (after this being referred to as T) of a separation of record format defined when writing down recorded information.And a synchronous synchronizing information SY who is used for reaching each synchronization frame is recorded in the part that a synchronization frame beginning has 14T length.
On the other hand, the pre-information on the DVD-R1 of being recorded in the present embodiment is recorded and is used for each synchronization frame.When the pre-information of device recording by pre-groove 4, will on plane session 3, form the pre-groove 4 of a synchronizing signal in the expression one pre-information adjacent to the zone of the synchronizing information SY in each synchronization frame of record recorded information.And, can form two of the pre-information content (address information) that expression is recorded or a pre-groove 4 on adjacent to the plane session 3 of the front portion of synchronization frame rather than synchronizing signal SY (by accident, owing to be the front portion rather than the synchronizing signal SY of synchronization frame, so may there be such situation: be not to form pre-groove 4) according to the pre-information content that is recorded.At this moment, in the present embodiment, in a record sector only at the synchronization frame with an even number (after this claiming " EVEN frame ") or only go up and form pre-groove 4, so that pre-information is recorded at the synchronization frame with an odd number (after this claiming " ODD frame ").That is, in Fig. 2,, then can on adjacent to the ODD frame of this EVEN frame, not form pre-groove 4 if go up the pre-groove 4 of formation at EVEN frame (solid line among Fig. 2 is towards shown in the upward arrow).
On the other hand, with a constant hunting frequency f to the 140kHz of all synchronization frames
0(promptly a synchronization frame is corresponding to 8 wave frequencies) swing flute profile session 2.Then, by detecting the constant hunting frequency f in the information record carrier described later
0, detect a signal that is used for the Spin Control of Spindle Motor.
An embodiment of foundation information record carrier of the present invention then, is described with reference to Fig. 3 to Fig. 6.It is following that what introduce is that the present invention is applied to the embodiment of a digital information recording that will send from main frame to the DVD-R1.
The total and the operation of the information record carrier of present embodiment at first, are described with reference to Fig. 3.In following embodiment, forming pre-groove 4 that comprises the address information on the DVD-R1 and the flute profile session of swinging 2 on the DVD-R1 in advance.When digital-information recording, at first detect pre-groove 4 to obtain the address information on the DVD-R1, detect numerical information then, be that recorded information is recorded to the record position on the DVD-R1.
As shown in Figure 3, an information record carrier S comprises: the light picker as an optical pickup apparatus and a recording unit; A reproduction amplifier 11; A demoder 12; A pre-groove signal demoder 13; Spindle Motor 14 as slewing; Servo circuit 15 as synchronizing information generation equipment; A processor (CPU) 16; A scrambler 17; A power control circuit 18; A laser drive circuit 19; An interface 20; And swinging signal extraction apparatus 22 that is used in information extracting device.The numerical information Srr that is recorded from external host 21 is imported into information record carrier S by interface 20.
The following describes the whole operation process.
Reproduce amplifier 11 and amplify a detection signal Sdt, this signal comprises corresponding to the hunting frequency of the flute profile session of being exported by light picker 10 2 and the information of pre-groove 4, exports one then corresponding to the hunting frequency of flute profile session 2 and the pre-information signal Spp of pre-groove 4.And, if this numerical information is recorded, then reproduce amplifying signal Sp of amplifier 11 outputs corresponding to the numerical information that has been recorded.
Then, 12 couples of amplifying signal Sp of demoder carry out 8-16 and separate to be in harmonious proportion and go to insert (DE-INTERLEAVE) operation with to amplifying signal Sp decoding, thereby export a restituted signal Sdm and a servo demodulation signal Ssd.
On the other hand, after the radio-frequency component of having been eliminated by a BPF (bandpass filter) 27 from the pre-information signal Spp that reproduces amplifier 11 outputs, this pre-information signal Spp is imported into pre-groove demoder 13 and swinging signal extraction apparatus 22.
13 of pre-groove signal demoders extract a signal that is included in the pre-groove 4 among the pre-information signal Spp by detection and obtains, then it is outputed to servo circuit 15 as a pre-groove detection signal Spdt, and it is decoded to export the pre-groove signal Spd of corresponding demodulation to processor 16.
On the other hand, 22 extractions of swinging signal extraction apparatus are included in the hunting frequency of the flute profile session 2 among the pre-information signal Spp to extract signal Sdtt to servo circuit 15 outputs.
According to pre-groove detection signal Spdt and servo modulation signal Ssd, what one of servo circuit 15 output was used for the focus servo control of light picker 10 and tracking servo control picks up servosignal Ssp.And according to extraction signal Sdtt described later, servo circuit 15 utilizes the hunting frequency f that extracts among the signal Sdtt corresponding to being included in
0Information, export a main axle servo control signal Sss and carry out servocontrol with rotation to Spindle Motor 14.
On the other hand, under the control of processor 16, interface 20 is to carry out an interface operation from the numerical information Srr that main frame 21 sends, and this information of being about to is got among the information record carrier S to export numerical information Srr to scrambler 17.
Then, according to modulation signal Sre, one of power control circuit 18 output is used for controlling the tracer signal Sd of the output of light picker 10 laser diode (not shown).
And, according to tracer signal Sd, laser drive circuit 19 output laser-driven signal Sdl, this signal in fact the driving laser diode so that the laser diode emission light beam B in the light picker 10.
At last, processor 16 utilizes the pre-groove signal Spd of demodulation of input to obtain pre-information, is controlled at DVD-R1 with the recording operation with numerical information Srr and goes up corresponding to the position that is included in the address information in the pre-information.Parallel with these operations, processor 16 according to restituted signal Sdm to reproducing signal Sot of outside output corresponding to the numerical information that has been recorded, and control information pen recorder S on the whole.
Information record carrier S also can reproduce the information that is recorded on the DVD-R1.At this moment, according to modulation signal Sdm, reproducing signal Sot is output to the outside by processor 16.
Then, with reference to Fig. 4 to Fig. 7 the structure that describes pre-groove demoder 13 among the embodiment in detail is described.
Fig. 4 is the block scheme of pre-groove signal demoder 13.In Fig. 4,, also BPF27, swinging signal extraction apparatus 22 and servo circuit 15 are illustrated for the input signal of pre-groove signal demoder 13 is described.
As shown in Figure 4, pre-groove signal demoder 13 comprises a threshold setting portion 23, one multiplier 24, one comparer 25 and demoders 26 as the checkout equipment example as the modulating equipment example.
Shown in (A) among Fig. 6, the pre-information signal Spp that is input to BPF27 is a signal that comprises the high frequency noise composition.Owing to there is not this noise composition of elimination after this signal is by BPF27, pre-information signal Spp is imported in pre-groove signal demoder 13 and the swinging signal extraction apparatus 22 under the situation that has comprised this noise composition.
Swinging signal extraction apparatus 22 comprises a limiter, a BPF, a two condition converter etc., noise composition of elimination and a pre-groove signal composition from pre-information signal Spp, and to servo circuit 15 output extraction signal Sdt, this signal obtains by only extracting the hunting frequency composition, shown in (B) among Fig. 6.
As shown in Figure 5, servo circuit 15 comprises a VCO (voltage controlled oscillator) 27, a frequency divider 28, a multiplier 29, an amplifier 30,31 and BPF of a LPF (low-pass filter) are to constitute PLL (phaselocked loop) circuit and to export a PLL signal Spl synchronous with the swinging signal Sdtt that extracts.Shown in (C) among Fig. 6, this PLL signal Spl is phase place and the frequency that a phase place and frequency all equal the swinging signal Sdtt that extracts, and its peak swing position and the signal that is superimposed upon the position consistency of the pre-groove signal on the swinging signal Sdtt.
As mentioned above, because pre-groove 4 is positioned on the constant phase with respect to flute profile session 2, so the position that pre-groove 4 is superimposed on the swinging signal Sdtt also is constant.
Therefore, as mentioned above, from by producing gating signal the PLL signal Spl of servo circuit 15 output and to obtain pre-groove detection signal with logic product greater than the signal of the predetermined threshold of this pre-information signal Spp be possible by calculating this gating signal.
But, shown in (A) among Fig. 6, because it is noise that pre-information signal Spp is included in when detecting, rather than corresponding to the radio-frequency component of the frequency content of the hunting frequency of flute profile session 2, so very little in signal section and the level difference between other signal section corresponding to pre-groove.Like this, by utilizing the method for above-mentioned gating signal, it is difficult accurately detecting pre-groove signal.
Therefore, present embodiment is attempted to increase corresponding to the signal section of pre-groove and the level difference between other signal section, so that highly precisely detect pre-groove by utilizing PLL signal Spl that pre-information signal Spp is carried out amplitude modulation(PAM).
The phase place that has the phase place that equals pre-information signal Spp in the present embodiment with the PLL signal Spl of the synchronizing signal that acts on amplitude modulation(PAM), and its amplitude peak position is set as the position that pre-groove is applied.The maximum output valve of PLL signal Spl is set as the unit voltage value of the output voltage of the pre-information signal Spp of representative, as 1[V].The minimum output valve of PLL signal Spl is set as one on the occasion of not change the polarity of pre-information signal Spp.
If as shown in Figure 4, the PLL signal Spl with characteristic like this multiplies each other with pre-information signal Spp by multiplier 24, and then pre-information signal Spp is by amplitude modulation(PAM).In other words, except the pre-information signal Spp shown in (A) among Fig. 7, the part that multiplies each other with the amplitude peak position of the PLL signal Spl shown in (B) among signal section rather than the figure is by amplitude modulation(PAM), make its amplitude shown in (C) among Fig. 7, reduce, and do not change corresponding to the amplitude of the pre-groove signal composition of the amplitude peak position of PLL signal Spl.Therefore, utilize such modulation technique, the composition that only strengthens pre-groove signal is possible, also is possible thereby reduce above-mentioned noise effect.
In the present embodiment, except carrying out this amplitude modulation, the reference wobble signal Sref by threshold setting portion shown in Figure 4 23 bias voltage V1 is used as a threshold signal (but this swinging signal is not only as threshold signal) that extracts pre-groove signal composition from the pre-information signal Smlt after the modulation.This is because the output of swinging signal change up and down owing to the interference of the adjacent flute profile session 2 shown in (B) among Fig. 6 and dotted portion (D) itself makes to be difficult to accurately detect pre-groove signal.
In other words, shown in (E) among Fig. 6,, eliminated the change component that produces owing to interference in the output of swinging signal by pre-information signal Smlt and the reference wobble signal Sref of biased V1 after the modulation relatively, thereby accurately carried out pre-groove detection, shown in (F) among Fig. 6.
As mentioned above, according to present embodiment, the PLL signal Spl that is set as pre-groove location by the pre-information signal Smlt after the modulation relatively and the phase place phase place that equals swinging signal Sdtt and peak swing position, can when eliminating the change component that produces owing to the interference that is included in noise composition in the pre-information signal and swinging signal, accurately detect pre-groove signal.
Consequently,, can accurately carry out the Spin Control of DVD-R according to the pre-groove detection signal of pinpoint accuracy, and digital-information recording signal Srr exactly.
In the above-described embodiments, pre-groove signal is superimposed on the position on the swinging signal and the peak swing position consistency of swinging signal.But the present invention is not limited to this.In other words, the present invention is applicable to that also it is not on the position of peak swing position that pre-groove signal is superimposed on one.At this moment, the peak swing position of synchronizing signal can be set as the superposed positions of pre-groove signal.More specifically, the phase place of synchronizing signal can be according to pre-groove about the phase place of predefined hunting frequency and phase shift.
And, illustrated that in above-mentioned related embodiment the present invention is applicable to the situation of DVD-R.But the present invention is not limited to this.For example, it is widely used in the situation on predetermined digital information recording to a recording medium (for example tape type recording medium) has been write down the information that is used for being undertaken by swinging operation record controls on the described recording medium.
Claims (10)
1, a kind of pre concave groove testing device (S), detect a pre-groove (4) when being used on recorded information being recorded a recording medium (1), wherein pass through with a information tracks (2 of warble corresponding to mobile control information, 3), make the mobile control information be used for when recorded information being recorded on the described recording medium, controlling the translational speed of described recording medium be recorded to recording medium, and by forming pre-groove at a predetermined phase relevant with the information tracks of swing, make to be used to control recorded information is recorded record controls information on the described recording medium also by record in advance, it is characterized in that pre concave groove testing device comprises:
An optical pickup apparatus (10) is used for launching light beam (B) simultaneously on described information tracks and the adjacent session adjacent to this information tracks, and according to the reproducing signal of light output from described information tracks and described adjacent session reflection;
A swinging signal extracts equipment (22), is used for extracting from the reproducing signal of output the swinging signal of the mobile control information of expression;
A synchronizing signal generation equipment (15) is used to produce a synchronizing signal, and consistent with the swinging signal that extracts respectively and its peak swing position of its phase place and frequency is set to be superimposed upon a position of the pre-groove signal on the swinging signal;
A modulating equipment (24) is used to utilize the synchronizing signal of generation that the reproducing signal of exporting is carried out amplitude modulation(PAM); And
A checkout equipment (25,26) is used for reproducing signal and a predetermined reference signal of comparison amplitude modulation, and exports a pre-groove detection signal.
2, pre concave groove testing device as claimed in claim 1 (S) is characterized in that predetermined reference signal comprises that one has the DC voltage of scheduled voltage and the signal that obtains by stack one on the swinging signal that extracts.
3, pre concave groove testing device as claimed in claim 1 or 2 (S) is characterized in that record controls information comprises that the expression recorded information is recorded in the record position information of a position on the described recording medium (1).
4,, it is characterized in that described recording medium (1) is made of a DVD as any described pre concave groove testing device (S) among the claim 1-3.
5. as any described pre concave groove testing device (S) among the claim 1-4, it is characterized in that in described information tracks and the adjacent session one is formed at one of plane session (3) on the described recording medium (1) and flute profile session (2), and in information tracks and the adjacent session another is plane session and in the flute profile session another that is formed on the recording medium.
6. pre-groove detection method, detect a pre-groove (4) when being used on recorded information being recorded a recording medium (1), wherein pass through with a information tracks (2 of warble corresponding to mobile control information, 3), make the mobile control information be used for when recorded information being recorded on the described recording medium, controlling the translational speed of described recording medium be recorded to recording medium, and by forming pre-groove at a predetermined phase relevant with the information tracks of swing, make to be used to control recorded information is recorded record controls information on the described recording medium also by record in advance, it is characterized in that pre-groove detection method comprises the following steps:
A light picks up step, is used on described information tracks and adjacent session, launching light beam (B) simultaneously adjacent to this information tracks, and according to the reproducing signal of light output from described information tracks and described adjacent session reflection;
A swinging signal extraction step is used for extracting the swinging signal of representing mobile control information from the reproducing signal of output;
A synchronizing signal generation step is used to produce a synchronizing signal, and consistent with the swinging signal that extracts respectively and its peak swing position of its phase place and frequency is set to be superimposed upon a position of the pre-groove signal on the swinging signal;
A modulation step is used to utilize the synchronizing signal of generation that the reproducing signal of exporting is carried out amplitude modulation(PAM); And
One is detected step, is used for reproducing signal and a predetermined reference signal of comparison amplitude modulation, and exports a pre-groove detection signal.
7. pre-groove detection method as claimed in claim 6 is characterized in that predetermined reference signal comprises that one has the DC voltage of scheduled voltage and the signal that obtains by stack one on the swinging signal that extracts.
8. as claim 6 or 7 described pre-groove detection methods, it is characterized in that record controls information comprises that the expression recorded information is recorded in the record position information of a position on the described recording medium (1).
9. as any described pre-groove detection method among the claim 6-8, it is characterized in that described recording medium (1) is made of a DVD.
10. as any described pre-groove detection method among the claim 6-9, it is characterized in that in described information tracks and the adjacent session one is formed at one of plane session (3) on the described recording medium (1) and flute profile session (2), and in information tracks and the adjacent session another is plane session and in the flute profile session another that is formed on the recording medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98114917 CN1206904A (en) | 1997-05-20 | 1998-05-20 | Pre concave groove testing device and method |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP130061/97 | 1997-05-20 | ||
| CN 98114917 CN1206904A (en) | 1997-05-20 | 1998-05-20 | Pre concave groove testing device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1206904A true CN1206904A (en) | 1999-02-03 |
Family
ID=5224370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98114917 Pending CN1206904A (en) | 1997-05-20 | 1998-05-20 | Pre concave groove testing device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1206904A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1327437C (en) * | 2003-06-26 | 2007-07-18 | 索尼株式会社 | Storage medium, recording/reproducing apparatus, and recording/reproducing method |
| US7342864B2 (en) | 2003-09-10 | 2008-03-11 | Kabushiki Kaisha Toshiba | Optical disk reproduction apparatus and optical disk reproduction method |
| CN100405496C (en) * | 2005-03-11 | 2008-07-23 | 联发科技股份有限公司 | Optical storage medium detection apparatus and method, movement direction detection method and optical driver |
-
1998
- 1998-05-20 CN CN 98114917 patent/CN1206904A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1327437C (en) * | 2003-06-26 | 2007-07-18 | 索尼株式会社 | Storage medium, recording/reproducing apparatus, and recording/reproducing method |
| US7342864B2 (en) | 2003-09-10 | 2008-03-11 | Kabushiki Kaisha Toshiba | Optical disk reproduction apparatus and optical disk reproduction method |
| CN100405496C (en) * | 2005-03-11 | 2008-07-23 | 联发科技股份有限公司 | Optical storage medium detection apparatus and method, movement direction detection method and optical driver |
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