TWI251226B - Adaptive writing method for high-density optical recording apparatus and circuit thereof - Google Patents

Abstract

An adaptive writing method for a high-density optical recording apparatus and a circuit thereof are provided. The circuit includes a discriminator for discriminating the magnitude of the present mark of the input data and the magnitudes of the leading and/or trailing spaces, a generator for controlling the waveform of the write pulse in accordance with the magnitude of the present mark of the input data and the magnitudes of the leading and/or trailing spaces to generate an adaptive write pulse, and a driver for driving the light source by converting the adaptive write pulse into a current signal in accordance with driving power levels for the respective channels. The widths of the first and/or last pulses of a write pulse waveform are varied in accordance with the magnitude of the present mark of input NRZI data and the magnitude of the leading and/or trailing spaces, thereby minimizing jitter to enhance system reliability and performance.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing method and circuit suitable for two high-density optical recording devices, and more particularly to a suitable light source. The ideal method of writing light, for example, a laser diode, can be applied to the characteristics and circuits of a recording device. [Prior Art] Since the multimedia era requires high-capacity recording media, the optical recording system enables two high-capacity recording media 'like a magnetic optical disk device (Μ〇DD) or a digital multi-purpose disk device using a random access memory (DVD-R). AM) has been widely used. Since the recording density is increased, the optical recording system requires an idealized and high-precision state. In general, as the recording density increases, temporary fluctuations in the data definition domain (due to the "surge" mentioned below) also increase. Therefore, it is very important to minimize the glitch in order to achieve a high density record. Conventionally, the formation of a write pulse is detailed in the DVD-RAM format manual shown in Figure 1 (b), regarding the input NRZI (NO N - Return to Zero Inversion) There are 3 T, 5 T and 1 1 T (T stands for the band timing period), which is indicated in Figure 1 (a). Here, the 'N R Z I poor material is divided into a standard area and a blank area. The blank area indicates that the bit is in the erasing erase level. The waveform of one write pulse of all the marked areas is equal to or larger than the marked area of 3T, that is, 3T, 4T, ... 1 1 T and 1 4 T are included in one first pulse, one last

1251226 ------ Five 'invention description (2) The number of pulses in a pulse and a multi-pulse sequence is based on the labeled area i here, only in the multi-pulse sequence, in other words, the write is small and variable of. Figure 1 (c), that is, the peak energy, or ^ waveform is included in a reading energy (quantity or erase energy (Figure i (df into energy (Figure 1 (d)) and bias energy signal is shown in Figure C, The combination of D. Here, the related energy. The waveform of the signal write pulse that is low-potential action in 1 E is the same as that generated by the root AM." - 2 GB 6 DVd~r DVD - R a M Reig, T said that according to the first-generation 2. 6 GB pulse, the waveform of a winter-sweet Xuliang write pulse is included in the -m ^ V 4L ^, the rush sequence and a last pulse. A falling edge or a falling edge of the last pulse can be read from a leading region, but suitable writing is not possible because the write pulse is fixed. Thus, when a write operation is performed by When a write pulse is formed to be performed as shown in Fig. 1 B, severe thermal interference may cause the backward or forward phase of the phase to be related to the marked area according to the rounding of the NRZJ data. In other words, when a marked area is long and When a blank area is short or bad, the glitch is more serious This is one of the main reasons for reducing system efficiency. Similarly, this makes it impossible to apply this system to high-density DVD-RAMs, for example, the second generation 4 * 7 GBD v D ~ RAM s SUMMARY OF THE INVENTION In order to solve the above problems, it is an object of the present invention to provide a

Page 9 1251226 ——------- V. Description of the invention (3) A = method ' ί: A write pulse is based on the input data. The size of the blank area after the fly is generated by another object of the present invention. The size and lead of the display area of the county are generated by a write pulse according to the input data, so that the blank area after the laser = The modest optical recording device of the size provides a suitable = idealized, high-density waveform is included for the first time:: 丄 2 f provides a method by recording the media, this suitable square is in an optical t white The size of the display area and the lead and/or the backward S-sink into the iis write pulse, and the appropriate write pulse to write the input data on the optical recording medium. In order to achieve the second purpose, here is a device for writing an input data in a first pulse, a last pulse and a multi-pulse sequence by means of an intrusion pulse. In the optical brother media, the suitable write circuit includes a discriminator that controls the write pulse by the size of the marked area and the size of the leading and/or trailing blank area when the clock is wheeled into the data. Waveform, this write pulse is based on the size of the marked area and the size of the leading and/or backward blank area to generate a suitable write pulse, and a drive dream is converted by a suitable write pulse into a basis The circuit signals of the drive level of the respective bands are used to drive the light source.

Page 10 1251226 ---- V. DESCRIPTION OF THE INVENTION (4) [Embodiment, hereinafter, a preferred embodiment of a high-density optical recording device method and circuit will be described and described in accordance with the present invention. A suitable write circuit, class 1 s contains a data clock 1 〇 2, - write 〇 wave = in Figure 2, package - a microcomputer i 〇 6, a write pulse generator 1 1 0 4, the road drive 1 1 〇. In other words, data sheet 38 and - electricity N R 2 I data. Write waveform controller 2 〇 ^ ^Identification input 1 〇 2 and ground/fixed signal generated discrimination result poor material discriminator ::Skin shape.胄Computer i 〇 6 Initialize write waveform control = Write pulse The program is stored in the write waveform controller 1 0 4: Data::〇 4 ’ or is updated. Write pulse generator work = generate a suitable $ write waveform controller according to the output of write state 1 〇 4 〇 conversion by write pulse generator 1 〇 8 production, circuit driver 1 ' becomes different The energy level of the band: 2-input write pulse. ^The old 旎 to drive the light source Next, Fig. 3 to Fig. 7 of the apparatus of Fig. 2 are shown. The action will break the description and please refer to the write pulse in Figure 2, data discriminator ( 2 (refer to the size of the private display area at the time)

In the first half of the blank area of the material; from the input NRZU (refer to the leading blank area, in the following " ^, the first pulse size of the Gongbai area meets the last pulse of the blank area at the time and the blank area of the second half And apply the leading and trailing blanks &> the blank area behind the test) White & and the size of the marked area at that time to write 1251226 V. Invention description (5) Into the waveform control and the current standard exceeds 100 pulses The rise and the memory are the size groups of the white area in the present invention. At that time, the two areas are written into the wave so that the backward and the direction are marked with the edge, so that the backward direction, so that the shape is not the same, that is, the device 1 0 4. The size of the display area. The edge and finally necessary, so that the input N R z ' is divided into the basis for the absence of the zone and the collar. The shape controller 1 is based on the size of the zone and the forward is rooted into a most optimal pulse sequence to make • 5 T. Here, the size of the leading and trailing blank areas may range from 3 to 3; [4 D. Therefore, in order to get the total number of changes in the falling edge of the first pulse in all conditions, the circuit is more complicated by the system and hardware. Therefore, in the I data at the time the marked area and the leading and trailing short burst group, the middle pulse group and the long pulse and the trailing blank area are distinguished by the size of 0 4, the rising edge of the first pulse, discriminator 1 〇2 provides the leading blank area, decides, or changes the falling edge of the last pulse according to the size of the current marking area and the backward blank area. Here, in the same form as that shown in Fig. 3B, the same is true, the write waveform controller 104 can correct the rising edge of the first pulse of the current marked area, and the last pulse of the marked area at that time. The falling edge becomes a different value 'on the ground line or fixed potential line is, according to the external supply ground / fixed signal (LAN [) / GR 〇〇 VE pointed input ~ NRZI data. This is to form a write waveform, taking into account the optimum light energy depending on the ground or fixed potential. The most ideal light energy has a gap of 1 - 2 m W between the ground and the fixed potential, which can be specially set or used by the design specification. Therefore, the write waveform controller

Page 12 1251226 V. Description of invention (6) 1 0 4 can be composed of a memory or a logic circuit. The poor material stored in the memory is equivalent to the size of the marked area according to the input of N rz I data at that time. , and the size of the leading and trailing blank areas, and the variation of the rising edge of the first pulse and the variation of the falling edge of the last pulse. In this case, the write waveform controller 1 〇4 is composed of one memory. The width of the first pulse and the last pulse is determined by the band timing (T) plus or minus a data value (variable value) and stored in the memory. In the body. In the same memory, the variation values of the first and last pulses for each of the ground and fixed potentials can also be stored. A table storing the variation values of the rising edge of the first pulse, and a table storing the variation values of the falling edge of the last pulse can be combined. Two separate tables that can be prepared are optionally shown in Figures 6 and 7. ^Microcomputer 1 0 6 Initializes the write waveform controller 1 〇 4 or controls the fluctuation value of the first t t or last pulse to be updated according to the recording status. In particular, 7υ "^ can be reset according to the zero position or the fluctuation values of the first and last pulses can be reset according to the zero position. The pulse width data used to control the waveform of the write pulse is supplied to the pulse generator 108. The write pulse generator 1 〇8 generates an i 2::ΐ Γ ΐ · shown in Fig. 3 F, which is the waveform of the write pulse supplied by the shape controller 104 according to the pulse width data, 嘀人:; In Figure 3 c, 3 D and 3 Ε, to control the 3:2: and the respective bands (ie, the read, spike and bias bands) are input to the current driver 1 1 0. An L _ move is a 1 1 0 conversion of the individual bands (ie reading, spikes and partial

Page 131251226 V. Description of invention (7) The driving energy level of the light energy of the band is the current, and the current of each band is controlled to allow the current to flow the same signal, so the appropriate amount of heat should be recorded continuously. The switching action or the change in the total amount of light. This domain is represented in Figure 3(g) as the media in the record. Figure 3(a) shows the input NRZ I data, and the blank area. Figure 3(b) shows that the rising edge of the first pulse of a basic write pulse is 0 · 5T from the current standard blood. Fig. 3(c) shows a waveform suitable for writing. Fig. 3(d) shows a waveform suitable for the write pulse, and Fig. 3(e) shows a waveform suitable for the write amount. Fig. 3(f) shows the waveform proposed by the present invention. The first edge of the write waveform for a suitable write pulse can be shifted backwards or forwards depending on the size of the leading blank area and the current indication. Any energy 彳 ^ energy or write energy) is equivalent to this offset $ sample, the most suitable write pulse waveform of the write pulse is shifted backward or forward according to the size of the marked area at the time and the trailing blank area . The same, red, ° ° Ren Si can buy a can or write energy. Alternatively, the size of the last pulse drop may be shifted forward or backward, irrespective of the size of the roll day ±1. Similarly, it is more appropriate to say that the control time spent with the media in the control of the laser diode, |軎@儿, a record is formed. It is divided into a labeled area-input waveform, in which a combination of a rising energy of a rising energy pulse of a rising edge of the writing region of the writing region can be adapted to a combination of the size of the rising edge of the pulse of the write pulse. The long finger is that it is applied during a reading period. The combined possibility of the size of the falling edge of the same pulse balance (herein, the offset is offset by the first pulse according to the backward blank area of the marked area at the time of the offset)

Page 14 1251226 V. INSTRUCTIONS (8) The rising edge and possibly the offset are implemented backwards, Figure 4 depicts. In the first indicator is the 1 2 group of the standard area 4 D. In the first group of indicators, the 11 1 T and 1 group indicators of the 11-group are grouped according to the respective edges, or the group is still grouped. The group group is 1 high group 5 and the middle pulse region is The falling edge of the last pulse of the high group, the mouth of any one pulse is the same, the direction of the offset is observed, and the offset may only be forward or only backward. The input NRZ]; the group of data indicates that in two cases, 'If a low group indicator is 3 and one is short, the marked area of the short pulse group is 3 □, and the middle is from 4 □ to 丄丄, long pulse In the two cases of group identification, if a low group indicator is 4 and a 'the short pulse group's marked area is 3T and 4 T display area from 5 T to 1 〇T, the long pulse group's standard 4 T . As explained above, practical efficiency is enhanced because low group indicators are used. The same zero is implemented differently. Fig. 5 depicts various cases determined by the combination of leading and trailing blank areas, and the current marking area, which is shown in Fig. 4 under the condition that the N R Z I data is input to classify the two groups into three groups. Figure 6 depicts a query S grid table showing the variation of the rising edge of the first pulse determined by the size of the leading blank area and the size of the current marking area. Figure 7 depicts a table showing the variation of the falling edge of the last pulse determined by the size of the current marked area and the size of the trailing blank area. Figure 8 is a flow chart depicting an embodiment of a suitable writing method of the present invention. First, a write mode is set (step s 101) = if the write mode has been set, then it is determined to be a suitable write method (step S102). If in step sl1, it has been decided that this write mode is,

Page 15 1251226 Less than the township and the indicator is determined by the label of a white V group table, the table of potentials. The variation value of the table of the zero position is the appropriate value of the write value indicated by the change value at the edge of the table of FIG. 6 from the change value shown in FIG. 7 (step S107). . It has been subjected to the bottom of the sequence. The energy of the bias is 5 rushes, when the write pulse is generated. • The speed of 2 meters. V. Description of invention (9) Suitable for writing chess ‘a group. Then, the group set by this is designated (step S104). This selection criterion also reflects that the grounding/fixing is a combination that reflects the rising edge of the first pulse of the recording medium and the current marking area, from the table S1), the last drop of the pulse and the backward blank. Combination of zones, (step S106). The appropriate write pulse is generated and the last pulse is based on the energy of the read % band of light used to produce the 'spike and ronon energy, which is controlled 0 8 ) to perform on the disc is not a suitable write The entry mode is generated in step S107. Figure 9 is a graph comparing the projection energy produced by the usual writing method to 9.5 mW, the multi-pulse 'cooling energy is 1 · 2 m W and writing a suitable write-like write according to the present invention. Entry method, write fixed (step S1〇3) group table is selected as / and group refers to the selected table is also read according to the leading blank space (step, according to the current standard The table is read, which is the first pulse. Then 'input pulse, that is, read system to drive a laser two-body (step. If this writes a normal write pulse will be produced) The writing method and solution, assuming that the peak amount is 1 · 2 m W * 2 m W, when the root of the glitch is greater than the generated spur wave, the erasing energy 7 is initialized at 4 per second.

Page 16 1251226 V. Description of the invention (ίο) • Write operation of 2mW and 1 0 〇. In other words, according to the present invention, when the marked area of the write pulse is appropriately changed, the rising edge of the first pulse is appropriately shifted, and the size of the blank area is led according to the input i'T RZI data, and the time of the marked area. The size of the waveform to control the write pulse, and / or the falling edge of the last pulse will be appropriately shifted 'according to the size of the input NRZI poor material at the time of the standard area' and the size of the blank space to control the waveform of the write pulse, Therefore, the glitch is minimized. Similarly, the waveform of the write pulse according to the ground/fixed signal may tend to be perfect. Similarly, in the present invention, the group may be implemented differently according to the respective zeros, using the group indicator. A new suitable writing method in accordance with the present invention can be employed in most high density optical recording devices that use suitable write pulses. As described above, the width of the first and/or last pulse of a write pulse is variable, and the burst is minimized based on the size of the labeled area at the time of the input NRZI data and the size of the leading or trailing blank area. To enhance the reliability and efficiency of the system. Similarly, the width of a write pulse is controlled by combining the size of the current marked area and the size of the leading or falling blank area, thereby reducing the size of the hardware.

BRIEF DESCRIPTION OF THE DRAWINGS [0009] The above objects and advantages of the present invention will become more apparent from the detailed description of the preferred embodiments. The waveform of the usual write pulse. Figure 2 is a block diagram of a suitable write circuit for a high density optical recording device in accordance with one embodiment of the present invention. Figures 3A through 3G are waveform diagrams of a suitable write pulse that is recorded by a suitable write circuit as shown in Figure 2. Figure 4 is a graphical illustration of the combination of input data. Figure 5 shows a combination of pulses generated by the combination of data shown in Figure 4. Figure 6 is a table showing the rising edge transition values of the first pulse in accordance with the present invention. Figure 7 is a table showing the falling edge variation of the last pulse in accordance with the present invention. Figure 8 is a flow diagram of a suitable writing method in accordance with one embodiment of the present invention. Fig. 9 is a view showing a comparison of the glitch generated by comparing the writing method and the usual writing method of the present invention. [Description of the number] 1 0 2 data discriminator 1 0 4 write waveform controller 1 0 6 microcomputer 1 0 8 write pulse generator

Page 18 1251226 Schematic description of the circuit 110 circuit driver ΙΗΙϋΙ page 19

Claims (1)

125^6 ^ --------- 1 · ΓΤ] The data written to the high-density optical recording medium is written to the pulse waveform control. The write pulse is the mark area and blank according to the NRZI signal. The value of the area ^ changes, the waveform corresponding to the pulse width occurs, and the method is characterized in that the method is to offset the rising edge of the current write pulse waveform according to the energy value of the marked area at the time and the leading blank 2: value ' . The control method according to claim 1, wherein the write pulse waveform is composed of a first pulse, a multi-pulse sequence, and a 、 pulse, and the writing is performed. The rising edge of the pulse waveform refers to the rising edge of the first pulse. 3. The control method according to claim 1 or 2, the special feature is that the offset of the rising edge is 向 backward or forward according to the combination of the energy value of the lead area energy value of the leading blank area. Offset. 4. The control method according to claim 1 or 2, wherein the offset of the rising edge is compared according to the energy value of the marked area at the time and the energy value of the leading blank area. The control method according to claim 1 or 2, wherein the rising edge offset value of the write pulse waveform is based on reading from a group table. The labeling area of the MRZI signal and the blank area ^ energy value, the grouping table is for the marking area of the NRZI signal and the blank area energy t ^ , the table grouped according to the different gland size, and the writing pulse waveform is generated according to the signal of the 肫 2} The rising edge offset value. The method of claim 5, wherein the grouping table passes the time stamp for the data on the recording medium. I251226 The non-area energy value, and the pulse width of the final pulse of the leading blank group, the medium pulse group, and the long pulse group waveform are the leading blank area energy value and the offset value of the current mark one-shot rising edge as described in claim 5 Width data. This value of E is divided into short burst groups' and the corresponding write pulse data is stored. The method is characterized in that, according to the combination of the energy values of the display regions, the first reading is performed, and the pulse of the first pulse is calculated.