TW200307263A - Adaptive writhing 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

200307263 V. Description of the invention (1) Background of the invention [Technical field to which the invention belongs] The present invention relates to a writing method and circuit suitable for making a two-density optical recording device, and more particularly, it relates to a method suitable for making The ideal writing method of the light energy of the light source, for example, a laser diode can be applied to the characteristics and circuits of the recording device. [Previous technology] Due to the need for high-capacity recording media in the multimedia age, the optical recording system uses the two-capacity speech recording media, the Zhengshikou magnetic Shizukuishi Li chestnut device (Μ0 DD), or a digital multi-purpose magnet using random access memory Disc devices (DVD — RAM) have been widely used. As the recording density increases, the optical recording system is required to be ideal and high precision. In general, with the increase in recording density, temporary fluctuations in the data domain (attributable to the “surges” mentioned below) also increase. Therefore, in order to achieve a high density, I ’ve reduced to:] the most λ I, is often important. By convention, the formation of a write-once 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 are shown in Figure 1 (a). Here, the N R Z I lean material is distinguished into a marked area and a blank area. The blank area indicates that it is in the erasing energy level of the copy. The waveform of one write pulse in all marked areas is equal to or greater than the marked area of 3T, that is, 3T, 4T, ... 1 1 T and 1 4 T are included in a first pulse and a final

200307263 V. Description of Invention (2)

Pulses and a multi-pulse sequence. The number of pulses is based on the large area of the marked area. In other words, Figure 1 (C) of the writing pulse is the peak energy or the amount of writing or erasing energy (Figure 1 (e)). The id sum here is small and variable only in multipulse sequences. The waveform is contained in a combination of read energy (input energy (Figure 1 (d)) and bias energy. Here, the relevant energy 1 E is a signal of low potential action

The area of one pulse of a pulse produced by writing A Μ DVD is equivalent to that of FIG. 1B. It is surge-like, and it does not become RAM pulsation. There is more than one pulse of RA Μ. The rising edge is read, fixed, and when executed once, it is even more serious about the length of the area according to the loss indicator. This also makes it possible to ‘for example s °

Shape and basis are the same. In other words, specifications, write pulse sequence and or last pulse but suitable 〇 Write action by ‘severe heat into N R ζ I and a null This is the lowering system This system is applied In the word’

Generation 2.6GB DVd-R machine > ’According to the first generation 2 * pulse waveform is included in the first last pulse of 6GB. Although the first

The falling edge of the data can be written from the area which is impossible because of the interference caused by the formation of a write pulse which may cause phase information. In other words, the white area is a major source of short or poor system efficiency. To high-density DVD — R 2nd generation 4 * 7 G B D leading writing pulses are indicated such as backward or otherwise, due to tilt. Same as AMs V D — [Content of the invention]

200307263 V. Description of the invention (3) ~-1 combination of writing method 'where one writing pulse' is generated based on the size of the time zone of the data rotation time zone and the size of the leading and / or trailing blank space. The waveform of the combined optical power of the time mark is recorded in the form of a punching sequence, and the root blank area is written as the post-pulse pulse recording medium wheel investment size. The punch is the root space. The size of the leading area is pulsed. The recording device uses a suitable size of the input data generated and / or laser diode to provide a suitable writing circuit for the light energy of the high-density backward space. In order to make the idealization of the white area included in one of the first in order to achieve the first purpose, this is based on the input data of the input and output data to reach the first impulse, and its sum on a multibody. At this time, a waveform is marked. According to the input signal size suitable for the write signal to drive a first pulse for a method by writing pulsed square time scales suitable for optical two mesh waveform is pulse When the large-scale generator of the suitable area is sequenced, the large write pulse of the recording area included in the pulsed light source method is included in the column, the length of the write circuit is small, and the lead is used to control the write. The appropriate writing of the marked area becomes ^-one step is to control the small and lead, and borrow. Provide a first write input containing the size of an and / or input pulse and the lead-in pulse, according to the pulse and material, respectively, and the writer and (or this wave suitable for a multifaceted optical recording pulse) backward The writing pulse device uses a sub-pulse, with the most data in an optical discriminator, to identify the waveform of the trailing blank area. This writing pulse precedes and / or lags behind and a driver borrows the driving energy. Order

200307263 V. Description of the invention (4) [Embodiment] In the following, a preferred embodiment of a suitable writing method and circuit for a high-density optical recording device will be described and please refer to the accompanying drawings. A suitable writing circuit, shown in Figure 2, contains a data discriminator 1 0 2, a writing waveform controller 丄 04, a microcomputer 106, a writing pulse generator 0 8 and a circuit driver 1 1 0. In other words, the data discriminator i 02 discriminates the input N R ZO data. The write waveform controller 104 corrects the waveform of the write pulse based on the discrimination results generated by the data discriminator 102 and the ground / fixed signal. The microcomputer 106 initializes the writing waveform controller 104, or controls the data stored in the writing waveform controller 104 to be updated according to the writing status ^. The write pulse generator 108 generates a suitable write pulse according to the output of the write waveform control = 1.04. The circuit driver I 1 0 converts the appropriate writing Z pulse generated by the writing pulse generator 1 08, and becomes a circuit signal according to the energy level of the light in the respective bands. The operation of the device of FIG. 2 will be described and please refer to FIGS. 3 to 7. In Figure 1, the write pulse when the size of the unidentified area is identified by the 02 symbol (see the marked area at the time), the size of the blank space in the first half of the input NRZI data matches the size of the blank area at that time. One pulse 5 (refer to the leading blank area, below), and the size of the second half of the blank area matches the last pulse of the blank area at the time (refer to the trailing blank area), and the leading and trailing blank areas and the marked area at that time are applied Case

200307263 V. Description of the invention (5) '" ~~ Enter the waveform controller 104. Here the size of the leading and trailing blank area and the size of the marking area at that time may range from 3 T to 1 4 T. May be more than 1 000 combinations. Therefore, in order to get the total of the rising edge of the first pulse and the falling edge of the last pulse in all conditions, circuits and memory are necessary, making the system and hardware more complicated. Therefore, in the present invention, the size of the current marked area and leading and trailing blank areas of the input NRZI data are divided into short pulse groups, medium pulse groups, and long pulse groups. The size of the distinction is based on the two. Write the waveform controller 104 to change the rising edge of the first pulse, so that backward and forward are determined by the leading blank area provided by the discriminator 102 and the size of the marked area at that time, or change the last pulse The falling edge makes the backward and forward directions according to the size of the marked area and the backward blank area at that time, so as to form a writing waveform with the optimal light energy. Here, the multi-pulse sequence of a marked area uses the same form as that shown in FIG. 3B, that is, 0.5 T. Similarly, writing to the waveform controller 104 can correct the rising edge of the first pulse of the marked area at that time, and the falling edge of the last pulse of the marked area at that time becomes a different value. On a ground line or a fixed potential line, According to the external supply ground / fixed signal (LAND / GROOVE), indicate the input NRZI data. This is to form a write waveform, taking into account the optimal light energy depending on the ground or fixed potential. The optimal light energy has a gap of 1 to 2 mW between ground and fixed potential, which can be specially set or used by the design manual. So write the waveform controller

Page 12 200307263 V. Description of the invention (6) 1 0 4 can be composed of a memory or a logic circuit. The data stored in the memory is equivalent to the NR z 丨 data rotated at the time. ^ The size of the marked area , And the size of the leading and trailing blank space, and the value of the rising edge of the first pulse and the value of the falling edge of the last pulse. In this case, the write waveform controller 丄 04 is composed of a memory. The width of the first pulse and the last pulse is determined by the band timing (D) plus or minus a data value (variable value) and stored in the memory. The two in the body are the same. In the memory, for each ground and fixed potential mark, the fluctuation value of the first and last pulses can also be a table of fluctuation values of the rising edge, and a table storing the last: two lower values. Can be merged. Two separate tables can optionally be shown in Figures 6 and 7. —The microcomputer 106 initializes and writes to the waveform controller 504 or controls the fluctuation value of the first or last pulse according to the recording status. In particular: according to the change of the zero position or the change value of the first and last pulses can be written: the shape of the pulse width data is provided to; shown in Figure 3F 'is based on the pulse width data and is used for control signal indication In FIG. 3c, the waveform of the write pulse provided by the controller 104 is suitable for the nesting pulses ten v 3 D and 3 ε to control the current, and 'and = to ^ (that is, reading the' peak and deflection band). Μ and input to the current driver 丄 丄 〇. The current driver 1 1 0 converts the drive level of the light energy of each band (ie, reading, spikes and deviations) on page 13. 200307263 V. Description of the invention (7)-Reliance band. The current level is controlled by the current band. In order to allow this current to flow through the laser diode, the system is the same, so the appropriate amount of heat is applied to the recording medium, the continuous switching action of the prostitute or the change in the total amount of light. $ 儿, a record :: The meaning domain table. The figure shown in Figure 3 (g) is formed by the media in the record. Figure 3 (a) shows the input NRz I data, which is divided into marked and blank areas. Fig. 3 (b) shows a basic write waveform, in which the rising edge of the first pulse of the pulse is lower than the rising edge of the marked area at the time = 0.5 D. Fig. 3 (c) shows a waveform of one read ^ s suitable for the write pulse, and Fig. 3 (d) shows a peak energy | of the suitable write pulse for the wave Φ, and Fig. 3 (e) shows suitable write for the write pulse The waveform of a bias energy s of the pulse. Fig. 3 (f) shows the waveform of a suitable write pulse proposed by the present invention. The rising edge of the first pulse of the write waveform of a suitable write pulse may be shifted backward or forward depending on the combination of the size of the leading blank area and the size of the marked area at that time. Any energy (referred to here as a read b amount or write energy) is applied during a period equivalent to this offset. Similarly, the falling edge of the last pulse of the write waveform of a suitable write pulse may be shifted backward or forward depending on the combination of the size of the marked area and the size of the trailing blank area at the time. Similarly, any energy (referred to here as a read energy or a write energy) should be selected in a period corresponding to this offset. The falling edge of the last pulse is based on the size of the marked area at the time. It may be shifted forward or backward, regardless of the size of the backward blank area of the marked area at that time. Similarly, it is more appropriate to offset the first pulse

Page 14 200307263 V. Description of the invention (8) ^ The rising edge and the last pulse may be shifted. Same, also, the edges of each pulse are implemented backwards, and can only be forward or only square. The offset may be forward or the group of input NR z I data described in Fig. 4 shows: "-射 'if A low group indicator is = = =, where the label is 1 2 'At this time, the label of the short pulse group is: ::: The labeling area of the group is from 4 τ to 丄 τ, and the county group loses ^ in the pulse group 4 T . In the basket-to do | by the long pulse group, and the labeling area is] group index is 11 T: when the second group, a low group index is 4 and a high group 1 1 T and 1 4 T. As 1 〇 The marked area of the Τ 'long pulse group is θθ 4b ^ 1 4 1 As described above, because both the low group finger and t = are used, households are strengthened with practical efficiency. Each zero position is implemented differently. In the same way, the group of people, 5 describes the blank area by leading and lagging, and multiple situations marked at the time with 22 ~ 疋, will use the NRZI data to turn into two, group = class The condition of three groups is shown in Figure 4. „6 =: and means =, not determined by the size of the leading blank area and the size of the marked area at the time ^ Table = the rising edge of the first pulse Changes in value. Figure 7 depicts a = determination j, which shows the variation of the falling edge of the post pulse by the size of the marked area at the time and the size of the trailing blank area c. The flow chart of Q, Q, Q and Q describes a suitable example of the present invention: a real garden example. First, a writing mode is set (steps & two methods, and if the writing mode has been set, it is determined whether it is a suitable one). Go (step S102). If it has been determined in step s 2 0, the writing, input, and input are different. 200307263 V. Description of the invention (9) Suitable writing modes, one group. Then, the group set by this is designated (step S104). This selected symbol can also reflect that the grounding / fixing is a combination of the rising edge of the first pulse of the medium in the recording and the marked area at that time (from step S105), the falling indication area of the last pulse and the backward blank area. Combination, (step S106). A suitable write pulse is generated and the final pulse is used to produce 'spike and bias energy based on the energy of the light in the other bands read, which is controlled in step S1 08) to perform a type on the disc is not a suitable write The entry mode is generated in step S107. Fig. 9 is a graph comparing the bursting light energy generated by the ordinary writing method is .9 · 5 m W, multi-pulse, cooling energy is 1 · 2 m W, and a suitable writing pulse is written according to the present invention. The general writing method has less fixed writing. In the case of initialization, 4 groups of indicators are set per second (steps S 1 Q 3). A group table determined by the target is selected. The group table 和 is a table with the group index potential. The selected form is also a zero form. The change value of is read in the table shown in FIG. 6 according to the leading blank area (the change value of the step edge is read from the table shown in FIG. 7 according to the time scale (step S107). The value of the secondary pulse is controlled. Then, the appropriate writing pulse for each student, that is, the read system, drives a laser diode (step by step writing. If this writing mode, an ordinary writing The incoming pulse will be produced by a suitable writing method and wave according to the present invention. It has been known that it is assumed that the bottom energy of the spike sequence is 1.2 m W and the bias energy is 5 * 2 m W. The generated surge is 2m faster than the surge generated based on the write pulse, erasing energy 7

200307263 V. Description of the Invention (ίο) • 2mW and 1000 write operations.

In other words, according to the present invention, when the marking area of the write pulse is appropriately changed, the rising edge of the first pulse will be appropriately shifted, and it is controlled according to the size of the leading space of the input NRZI data and the size of the marking area at that time. The waveform of the write pulse, and / or the falling edge of the last pulse will be appropriately shifted. The waveform of the write pulse is controlled according to the size of the marked area at the time of the input NRZI data and the size of the trailing blank area, so the surge is reduced to The smallest. Similarly, the waveform of the write pulse based on the ground / fixed signal can be perfected. Similarly, in the present invention, the 'group' may be implemented differently according to the respective zero bits, using the group index. A new suitable writing method according to the present invention can be adopted in most high-density optical recording devices using suitable writing pulses. As stated above, the width of the first and / or last pulse of a write pulse is variable. According to the size of the marked area at the time of the input NRZI data and the size of the leading or trailing blank space, the surge is reduced to Minimal to enhance the reliability and efficiency of the system. Similarly, the width of a write pulse is controlled by reducing the size of the hardware by combining the size of the current marked area and the size of the leading or trailing blank area.

Page 17 200307263

[Brief description of the figure] The preferred embodiment will become more apparent with reference to the obvious drawings. Figures 1A to 1E are waveform diagrams of ordinary write pulses. Fig. 2 is a block diagram of a suitable writing circuit for a high-density optical recording apparatus according to an embodiment of the present invention. The above objects and advantages of the present invention are described in detail by referring to FIGS. 3A to 3G, which are waveform diagrams of a suitable write pulse, which is recorded by a suitable write circuit shown in FIG. Figure 4 is an illustration of a combination of input data. FIG. 5 illustrates the pulse combinations generated by the data combination shown in FIG. Figure 6 illustrates the rising edge variation of the first pulse according to the present invention. Fig. 7 shows the falling edge fluctuation values of the last pulse according to the present invention. Fig. 8 is a flowchart of an abstract writing method according to an embodiment of the present invention. Fig. 9 is a diagram illustrating a comparison of a surge generated by a suitable writing method and a conventional writing method of the present invention. [Illustration of drawing number] 1 0 2 data discriminator 1 0 4 write waveform control p 1 0 6 microcomputer 1 0 8 write pulse generator

200307263 Schematic description 110 circuit driver Η page 19

Claims (1)

200307263 1. A method for applying the energy value to the zone energy value 2. The last write pulse as described in the application refers to the first 3. If the application is specialized, the time is marked 4 Therefore, the and leading high-density optical recording write pulses, changes, and generation methods are roots, and are composed of the first pulse waveform of the writing range at that time, and the first rising edge of the subpulse range. The range of benefits of the first rising edge of the white area of the energy recording medium is based on the NRZI talents corresponding to the pulse according to the entry into the pulse waveform item at the time. The offset described in or 2 is a combination of the roots, and the offset described in or 2 is a waveform of the width of the marked area and the blank area of the control signal written into the pulse waveform for comparison with the root value, which is characterized by the area energy Value, offset from the rising edge of the leading margin. The control method is characterized by the rising edge of the pulse, multi-pulse sequence, and the most pulse waveform. The control method is characterized by the backward or forward shift according to the energy value of the leading blank area. The control method is characterized in that a corresponding offset is made according to the energy value of the marked area at that time. The shift value is based on the energy values of the marked and blank areas of the MRZI signal read in the grouping table. The grouping table is written for the energy values of the marked and blank areas of the NRZI signal: 2: t: a table of large and small groups, It also contains the rising edge offset value of the inrush pulse waveform that occurs with the NRZ1 signal. 6. The control method according to item 5 of the scope of patent application, wherein the grouping table is based on the time stamp of the input data on the recording medium. 2UU3U / ZbJ Page 21