TWI251229B - 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 use in a high-density optical recording apparatus, 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, optical recording systems use high-capacity recording media, such as magnetic disk devices (Μ〇DD) or digital multi-purpose disk devices using random access memory (DVD-R AM) ), have 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, in order to achieve high density records, it is very important to minimize the glitch. Conventionally, the formation of a write pulse is detailed in the DVD-RAM format manual shown in Figure 1 (b), regarding the input NRZ I (N 0 N - Return to Zero Inversion is: no reflection to zero inversion) The data has 3 T, 5 D and 1 1 T (T represents the band timing period) of the marked area, shown in Figure 1 (a). Here, the NRZ I data is divided into a marked 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

9104093.ptd Page 8 1251229 V. INSTRUCTIONS (2) Pulses and a multi-pulse sequence. Here, only the number of pulses in the multi-pulse sequence is variable depending on the size of the marked area. In other words, the waveform of the write pulse is contained in a read energy (Figure 1 (c), ie peak energy or write energy (Figure 1 (d)) and bias energy or erase energy (Figure 1 (e) The combination of the energy signals is shown in Figure 1 C, 1 D and 1 E are low-potential action signals〇

The waveform of the write pulse is the same as that produced according to the first generation 2 · 6 G B D V D — R A Μ. In other words, according to the specifications of the first generation 2 · 6 G B D V D - R A Μ, the waveform of the write pulse is included in a first pulse, a multi-pulse sequence and a last pulse. Although the rising edge of the first pulse or the falling edge of the last pulse can be read from a leading region, suitable writing is not possible because the write pulse is fixed. Thus, when a write-once operation is performed by forming a write-once pulse as shown in Fig. 1, severe thermal interference may cause a backward or forward phase of the phase to be associated with the marked region according to the input N R Ζ I data. In other words, when a marked area is long and a blank area is short or poorly inclined, the glitch is more severe. 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, second-generation 4·7 GB DVD-RAM s 发明 [Summary] To solve the above problem, this is An object of the present invention is to provide a

9104093.ptd Page 9 1251229 V. INSTRUCTIONS (3) Suitable writing method, in which the size and lead of a marked area and (or the write pulse, according to the input data) are generated by the size of the blank area after the Luo of. At the same time, the waveform of the write-off optical is marked by the serial recording medium, and the root blank area is written as the write pulse pulse recording medium input size, and the punch is the root blank by the converted circuit of a region of the present invention. The size and the incoming pulse, so that the recording device is provided, in order to achieve the purpose of being included in a first purpose, by first and/or falling the laser diode, for the first purpose of the first pulse On the basis of the input size, the input is rushed, and it is combined with a body, and the time stamp is based on a large suitable signal of the input area to generate a suitable waveform when the second data is generated. Multi-pulse is suitable for the shape of the display area. When the data is generated, the write-pulse-driven light pulse is generated by the method. The method is to write the size of the write record in the package sequence, and the write size and the device in the package sequence are not suitable for the control. Chong became the source. Write the size of the input step into the pulse media. Here, the one that writes the circuit pack leads and writes the large write of the write area. The light is generated after the input of the light. Sudden and collar, and the blank can manage the road. Providing the back-end data control first and by this according to the size of the input data area, for a high-density method by rushing and a multi-pulse in an optical write pulse (or) backwards suitable write The pulse is supplied to a device by means of a first pulse, a maximum input data in an optical containing a discriminator to identify (or) the waveform of the pulse in the blank area, which is written to the pulse and the leading sum ( Or) the backward pulse, and the drive energy level of a driver

9104093.ptd Page 10 1251229 V. INSTRUCTION DESCRIPTION (4) [Embodiment] Hereinafter, a preferred embodiment of a suitable writing method and circuit for a high-density optical recording device will be described and reference is made to the accompanying drawings. . A suitable write circuit in accordance with the present invention, shown in Figure 2, includes a data discriminator 1 0 2 , a write waveform controller 1 0 4 , a microcomputer 1 0 6 , and a write pulse generator 1 0 8 And a circuit driver 1 10 0. In other words, the data discriminator 1 0 2 discriminates the input N R Z I data. The write waveform controller 1 0 4 corrects the waveform of the write pulse based on the discrimination result generated by the data discriminator 1 0 2 and the ground/fixed signal. The microcomputer 1 0 6 initializes the write waveform controller 1 0 4 , or controls the data stored in the write waveform controller 1 0 4 to be updated according to the write state. The write pulse generator 1 0 8 generates a suitable write pulse based on the output of the write waveform controller 104. The circuit driver 1 10 converts a suitable write pulse generated by the write pulse generator 1 0 8 into a circuit signal according to the energy level of the light of the respective band to drive the light source

9104093.ptd Page 11 1251229 V. Description of the invention (5) Input waveform controller 1 0 4. Here, the size of the leading and trailing blank areas and the size of the marked area at that time may range from 3 T to 14 T. There may be more than 1 000 combinations. Therefore, in order to obtain the total number of fluctuations in the rising edge of the first pulse and the falling edge of the last pulse in all conditions, circuits and memories are necessary, making the system and hardware more complicated. Therefore, in the present invention, the size of the input NRZI data at the time of the marked area and the leading and trailing blank areas is divided into a short pulse group, a medium pulse group and a long pulse group, and the marked area and the leading and trailing blank areas are The size of the distinction is used as the basis for the distinction. The write waveform controller 1 0 4 changes the rising edge of the first pulse so that the backward and forward are determined according to the leading blank area provided by the discriminator 102, and the size of the current marked area, or the last pulse is changed. The falling edge is such that the backward and forward are based on the size of the then marked area and the trailing blank area, thus forming a write waveform of the most ideal 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 butyl. Similarly, the write waveform controller 104 can correct the rising edge of the first pulse of the current marked area, and the falling edge of the last pulse of the marked area at that time becomes a different value, on the ground line or the fixed potential line. The input NRZI data is indicated according to the external supply ground/fixed signal (LAND/GROOVE). This is to form a write waveform, taking into account the optimum light energy depending on the ground or fixed potential. The ideal light energy has a gap of 1 to 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

9104093.ptd Page 12 1251229 V. INSTRUCTIONS 1 0 4 Data in the body The sub-pulse variation of the marked area. Recalling the body group (D) plus. Any micro-times and/or grounds of the falling edge of the first pulse of the same zone, the light energy can be controlled according to the zero bit used to write the appropriate write of the pulse, and the current is supplied with a suitable current. The memory or a logic is stored, which is equivalent to the variation value according to the rising edge of the size 'and the leading and trailing blanks, and in this case, the waveform control pulse and the last pulse data value (variable value) are written in the memory. The table of the table for the variation value of the variation value of each post-pulse may be combined to indicate that the variation value of the initial write waveform pulse in FIG. 6 and FIG. 6 is changed according to the zero position or the first time 'first time Subtract one, select one or the most rising edge value to choose one brain or the last can be reset by the control write generator into the pulse write wave control signal input pulse and input to the driver circuit when the input area of the large last pulse The width of the controller 1 is determined by a grounding and can be stored. The two 7 ° controllers record the shape and finally form the N R Z small, while the rushed lower 0 4 is the degree that is stored in and fixed. The last 10 4 states of the memory are more pulsed, and the first edge of the first edge of the memory of the pulse memory of the slice memory material can be controlled or controlled by the first time. . The special variation value can be supplied to the pulse width data of the pulse waveform and is supplied as 〇 1 〇 8 . The write pulse generator i 〇8 generates a ^ γ which is shown in Fig. 3 F and is a waveform of the write pulse supplied from the pulse width data shape controller 104, and the numbers are shown in Fig. 3 C, 3 D and 3 e , To sue two separate bands. : ie read, spike and bias band) to current driver 1 1 〇 . 1 1 0 converts individual bands (ie reads, spikes and biases)

1251229 V. INSTRUCTION DESCRIPTION Depending on the band) Control the individual signal phases. The continuous open field indicates the waveform of the waveform of the first 0. 5 waveform of the pulse and the waveform of the quantity. Optimum, according to the ability to back or take energy or sample, according to the same or backward to read a (7) light energy band, the closing action is shown in Figure 3 (a). Figure 3 A pulse T. Figure, Figure 3 and Figure. Figure 3 Combined Write Lead Empty Forward Forward Write Writeable Time Mark Front Offset Energy or Use. The size of any one of the places may not be the size of the forward. The driving current of the phase, the appropriate amount or the total amount of light (g) is shown at the input N (b) indicating the rise of the rush 3 (c) Table (d) indicates that 3 (e) Table (f) indicates the pulse into The big shift of the white area. Any amount) the size of the region where the pulse is inserted. The same write energy, the last pulse or the backward bias, said that the order allows the heat to be recorded on the edge of the RZ, and the edge is suitable for the display of the small write and the other for the electric application. When the combination of the sum of the waveforms of the current energy, the bias waveform is written and dropped, any) after the equivalent of the first-class, the flow of flowers flowing through the record. Here the media is expected, its write time stamp is not written to the appropriate first target area of the pulse input pulse (the energy of the last white area of the period of the shift here is controlled by the laser Medium, a formed differentiated waveform, the size of a punched one of the upper punches of the zone refers to the size of the pulse within the interval (the time of the shift and the polar body The control body 'hunting is determined by the record as the standard on which the rising edge of the peak is turned into the pulse? '- The application of the descending combination refers to the inter-indicated area of the input edge energy-receiving energy The same edge may be the downward movement of the rush, and the more appropriate middle edge is offset from the first pulsation according to the time zone of the time zone.

9104093.ptd Page 14 1251229 V. INSTRUCTIONS The rising edge may be biased towards the implementation of Figure 4. In the first indicator is the label of group 1 4 T. In the group index is the group of 1 group and the group indicator group can be classified into the grid table according to the determination of each group 5, the first representation of the embodiment of Figure 8 by the subsequent pulse is written ( Step (8) and the falling edge of the last pulse 'the edges of any one pulse are shifted. Similarly, observe the direction of the offset, the offset may be forward or only forward or only backward. Describe the input NRZI tribute In the case of a group that does not show two cases, if a low group indicator is 3 and a high group 2, the marked area of the short pulse group is 3 T, and the medium pulse group area is from 4 T to 1 1 T, the marked area of the long pulse group is 1 in the second example. If a low group indicator is 4 and a high group 11, the marked area of the short pulse group is 3 T and 4 T, and the middle pulse mark area is from 5 T to 10 0, the marked area of the long pulse group is 1 4 T. As described above, since the low group indicator and the high group are used, the practical efficiency is enhanced. Similarly, the group zero And is implemented differently. Describe the group of leading and backward blank areas, and the group of the time zone In a variety of cases, the input NRZI data is used in the group of three groups, which is shown in Figure 4. Figure 6 depicts a table whose edge is determined by the size of the leading blank area and the size of the time zone. The value of the variation. Figure 7 depicts a table, the size of the time-scaled area and the variation of the falling edge determined by the size of the blank area. A flow chart describing a suitable writing method of the present invention. The mode of writing is set (step S 1 0 1). The mode has been set to determine whether it is a suitable write side S1 0 2). If it is determined in step S102, the write mode is one.

9104093.ptd Page 15 1251229 V. Description of the invention (9) For a suitable write mode, a group indicator is set (step S 1 0 3). Then, a group table determined by the set group index is selected (step S1 0 4). This selected group table is a table that reflects the ground/fixed potential as well as the group indicator. The selected form is also a form that reflects the zeros of the media in the record. The variation value of the rising edge of the first pulse is read from the table shown in Fig. 6 according to the combination of the leading blank area and the current marked area (step S1 0 5), and the variation value of the falling edge of the last pulse, It is read from the table shown in Fig. 7 based on the combination of the marked area and the trailing blank area at that time (step S106). A suitable write pulse is generated (step S1 0 7), wherein the first pulse and the last pulse are controlled based on the read variation value. Then, the energy of the light of the respective bands is used to generate suitable write pulses, ie, read, spike and bias energy, which are controlled to drive a laser diode (step S1 0 8) to be on the disc. Perform a write action on it. If this write mode is not a suitable write mode, a normal write pulse will be generated in step S 107. Figure 9 is a diagram comparing the glitch generated by a suitable writing method and a conventional writing method according to the present invention. It has been understood that assuming a peak light energy of 9 · 5 m W, a multi-pulse sequence with a bottom energy of 1 · 2 m W , a cooling energy of 1 · 2 mW and a biasing energy of 5 · 2 mW, when written in accordance with the present invention For a suitable write pulse, the glitch generated is less than the glitch generated when a fixed write pulse is written according to a general write method. Initialization is 4 · 2 meters per second, erasing energy 7

9104093.ptd Page 16 1251229 V. INSTRUCTIONS (ίο) The input of the label N is rooted in, and fe7 is shifted to the ground. Appropriate for the move, the fate of the last time according to the Ming Dynasty, ο根冲ο, pulse 1 said the second and the words a sentence m change, 2 districts • control to go to the edge of the small meeting The side of the area shows the rushing pulse and the pulse when the lowering of the standard, the small maximum or the area and the white, the empty shape of the first wave of the material rushing into the vein I into the Z after the R system is the most falling and subtracting, the wave small ambassador In this area, because of the indication, the wave of the material of the wave is rushed into the Z, and the R system is controlled to enter the small root of the data. The white space of the area is changed to the direction of the wave. The pulse promises or writes the group number group letter, and the Zhongzhong Guming\Fei land is connected to the data, and the roots are similar to each other. The same good. When the end is less than the maximum, the use of the mining method can be written. The standard of the group refers to the group that uses the new one to make one, and the line of the same is the same as the root of the zero. Or set and record a record of the first light of the first degree of the pulse of the pulse into the pulse of a pulse, the description of the combination of the appropriate use of such as the most positive to the subtraction of the standard wave When the material is obtained, the transfer area of Z, R and N is in accordance with the white root space, and the subsequent change may be the first and the width and the width of the small punch or the pulse. small. , the size of the large inch of the same area of the opposite body. When the standard hard rate is effective, the small and the condensed group can be borrowed, and the large control system of the small system is added with white.

9104093.ptd Page 17 1251229 BRIEF DESCRIPTION OF THE DRAWINGS [Brief Description of the Drawings] The above objects and advantages of the present invention will become more apparent from the detailed description of the preferred embodiments. 1 E is 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. The table of Figure 5 illustrates the combination of pulses produced 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

9104093.ptd Page 18 1251229 Schematic description 1 1 0 circuit driver 9104093.ptd Page 19

Claims (1)

1251229 i _,.....一j_ VI. Patent application scope 1. A control method for a write pulse waveform for a high-density recording medium, the write pulse being the energy of the marked area and the blank area according to the NRZ I signal The value changes, a waveform corresponding to the pulse width occurs, wherein the method is to offset the rising edge of the current write pulse waveform according to the energy value of the marked area and the energy value of the leading blank area, and according to the indication at the time. The zone energy value and the trailing blank zone energy value are offset from the falling edge of the write pulse waveform at that time. 2. The control method according to claim 1, wherein the write pulse waveform is composed of a first pulse, a multi-pulse sequence, and a last pulse, and the write pulse waveform rises. The edge refers to the rising edge of the first pulse, and the falling edge of the write pulse waveform refers to the falling edge of the last pulse. 3. The control method according to claim 1 or 2, wherein the offset of the rising edge is backward or forward based on a combination of the energy value of the leading blank area and the energy value of the current marked area. The offset, and the offset of the falling edge is offset backward or forward according to the combination of the energy value of the marked area and the energy value of the trailing blank area. 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 corresponding offset, and the offset of the falling edge is compared according to the energy value of the marked area at that time and the energy value of the trailing blank area, and then the corresponding offset is performed. 5. The control method as described in claim 1 or 2 of the patent application is characterized in that 9104093.ptd Page 20 1251229 VI. The scope of the patent application is that the offset of the rising edge or the falling edge of the write pulse waveform is based on the energy of the marked area and blank of the NRZI signal that can be read from a group table. Value, the grouping table is a table that is distinguished by the different pulse sizes for the labeled area and the blank area energy value of the NRZ I signal, and contains a rising edge offset value or a falling edge offset of the write pulse waveform generated with the NRZI signal. Move the value. 6. The control method according to claim 5, wherein the grouping table is divided into short by the energy value of the current marked area of the input data on the recording medium and the energy value of the leading backward blank area. A pulse group, a medium pulse group, and a long pulse group, and store pulse width data corresponding to the first or last pulse of the pulse waveform. 7. The control method according to claim 5, characterized in that: according to the combination of the energy value of the leading blank area and the energy value of the current marked area, the offset value of the rising edge of the first pulse is read, and the calculation is performed. The pulse pulse width data of one pulse; according to the combination of the energy value of the marked zone and the energy value of the trailing blank zone, the offset value of the falling edge of the final pulse is read, and the pulse width data of the last pulse is calculated. 9104093.ptd Page 21