TWI251227B - 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〇N - Return to Zero Inversion is: no reflection to zero inversion) The data is labeled with 3 T, 5 T and 1 1 T (T represents the band timing period) and is shown in Figure 1 (a). Here, the NRZ I tribute 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

9104092.ptd Page 8 1251227 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 by the first generation of 2. 6 G B D V D — R A Μ. In other words, the waveform of the write pulse according to the specification of the first generation 2 · 6 G B DVD - RAM is contained in a first pulse, a multi-pulse train 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. 1B, 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 Z 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

9104092.ptd Page 9 1251227 V. Description of the invention (3) A suitable writing method, in which a write pulse is generated according to the size of the marked area and the size of the leading and/or backward blank area when the data is input. . Another object of the present invention is to make the laser light ideal for the laser diode by generating a suitable write pulse according to the size of the marked area and the size of the leading and/or backward blank area when the data is input. To provide a suitable write circuit for high density optical recording devices. Therefore, in order to achieve the first object, there is provided a method for writing input data by means of a waveform contained in a first pulse, a last pulse and a write pulse in a multi-pulse sequence on an optical recording medium. In the above, the method includes a step of controlling the waveform of the write pulse, and generating a suitable write pulse according to the size of the marked area and the size of the leading and/or backward blank area when inputting the data, and thereby suitable writing The input pulse is written into the optical recording medium. In order to achieve the second object, there is provided a device for writing a input data in an optical by a write pulse whose waveform is contained in a first pulse, a last pulse and a multi-pulse sequence. On the recording medium, the suitable write circuit includes a discriminator for discriminating the size of the marked area and the size of the leading and/or trailing blank area when inputting the data, and a waveform generator for controlling the waveform of the write pulse. The write pulse is based on the size of the marked area and the size of the leading and/or trailing blank area to generate a suitable write pulse, and a driver converts the appropriate write pulse into a separate band. The circuit signal of the energy level is driven to drive the light source.

9104092.ptd Page 10 1251227 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 illustrated. Take the picture. A suitable write circuit in accordance with the present invention, shown in Figure 2, includes a data discriminator 1 〇 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 1 0 . In other words, the data discriminator 1 0 2 discriminates the input N R Z I data. The write waveform controller 1 〇 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 wavelength band, to drive the light source test and describe the work to be performed. The figure 2 is shown in the table, Ο来7 The following figure is connected to the 3 figure. When the time is the same, the number of the 贝 I Ζ Ζ R R Ζ Ζ Ζ Ζ Ζ Ζ Ζ Ζ Ζ Ζ Ζ 输 输 输 — — — — — — — — Do not take the time when you are in the instrument.

The area of the rushing pulse area is white and empty, and the half of the area is white and empty. When the time is small, the area is small and large, and the area of the white area is empty and the first half of the collar is in front of the test. Zhu / C / / 'Ν The back area of the area where the white space is small and small is the C-timed pulse of the test reference and the white space of the back area, and the first-time collar of the white space is small and large.

9104092.ptd Page 11 1251227 V. INSTRUCTIONS (5) Into the 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 T. 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 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

9104092.ptd Page 12 1251227 V. Description of 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 size of the marked area according to the input NRZI 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 104 is composed of one memory, and the widths of the first pulse and the last pulse are determined by the band timing (T) plus or minus a data value (variable value) and stored in the memory. In the body. Similarly, in the memory, the fluctuation values of the first and last pulses for each of the ground and fixed potential indicating regions 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. The microcomputer 1 0 6 initializes the write waveform controller 1 0 4 or controls the fluctuation value of the first and/or last pulse to be updated according to the recording state. In particular, the light energy can be reset according to the zero position or the variation 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 write pulse generator 1 0 8 . The write pulse generator 1 0 8 generates a suitable write pulse, shown in Figure 3F, which is used to control the waveform of the write pulse provided by the write waveform controller 104 based on the pulse width data and provides control The signals are shown in Figures 3 C, 3 D and 3 E to control the current in the respective bands of the suitable write pulses (i.e., the read, spike and bias bands) and are input to the current driver 1 1 0 . Current driver 1 10 converts individual bands (ie, reads, spikes, and biases)

9104092.ptd Page 13 1251227 V. INSTRUCTIONS (7) The driving energy level of the light energy of the band is the current, the control time spent and the current of each band are controlled to allow this current to flow through the laser diode. The control signals are the same, so an appropriate amount of heat is applied to the recording medium, by continuous switching action or a change in the total amount of light. Here, the defined domain of a record is represented in Figure 3 (g) where the media in the record is formed. Figure 3 (a) shows the input of the NRZ I tribute, which is divided into the standard area and the blank area. Figure 3 (b) shows a basic write waveform in which the rising edge of the first pulse of the write pulse falls by 0 · 5 T from the rising edge of the current labeled area. Figure 3 (c) shows the waveform of a read energy suitable for the write pulse, Figure 3 (d) shows the waveform of a peak energy suitable for the write pulse, and Figure 3 (e) shows the suitable write pulse. A waveform that biases energy. Figure 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 pulse of the suitable write pulse may be shifted back or forward depending on the combination of the size of the leading blank area and the size of the current marked area. Any energy (herein referred to as a read energy or write energy) is applied during the period corresponding to this offset. Similarly, the falling edge of the last pulse of the write pulse of the suitable write pulse may be shifted backward or forward depending on the combination of the size of the marked area at that time and the size of the trailing blank area. Similarly, any energy (herein referred to as a read energy or write energy) is applied during the period corresponding to this offset. Alternatively, the falling mid-edge of the last pulse may be shifted forward or backward depending on the size of the marked area at that time, regardless of the size of the trailing blank area of the marked area at that time. Similarly, say more appropriate, offset the first pulse

9104092.ptd Page 14 1251227 V. INSTRUCTIONS (8) The rising edge and the falling edge of the last pulse, the edges of any one pulse may be offset. Similarly, observe the direction of the offset, which may be forward or backward, only forward or backward only. Figure 4 depicts a group of input N R Z I data, showing a group of two cases. In the first example, if a low group indicator is 3 and a high group indicator is 1 2 , the marked area of the short pulse group is 3 T, and the marked area of the medium pulse group is from 4 T to 1 1 T, the marked area of the long pulse group is 1 4 T. In the second example, if a low group indicator is 4 and a high group indicator is 1 1, the marked area of the short pulse group is 3 T and 4 T, and the marked area of the medium pulse group is from 5 T to 1 〇T, the marked area of the long pulse group is 1 1 T and 1 4 butyl. As described above, since both the low group indicator and the high group index are used, the practical efficiency is enhanced. Similarly, groups can be implemented differently depending on the individual zeros. Fig. 5 depicts various cases determined by the combination of leading and trailing blank areas and the current marked area, and is shown in Fig. 4 under the condition that the input N R Z I data is classified into three groups using the group index. Figure 6 depicts a table showing the variation of the rising edge of the first pulse as 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 S1 0 1). If the write mode has been set, it is determined whether or not it is a suitable writing method (step S1 0 2). If it is determined in step S1 0 2 that the write mode is one

9104092.ptd Page 15 1251227 V. INSTRUCTIONS (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 S108) for the disc. Perform a write action. 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

9104092.ptd Page 16 1251227 V. INSTRUCTIONS (10) • Write operations of 2mW and 100 times. 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, according to the size of the leading blank area of the input NRZI lean material and the size of the time zone. To control the waveform of the write pulse, and / or the falling edge of the last pulse will be appropriately offset, according to the size of the marked area of the input NRZI data, and the size of the trailing blank area to control the waveform of the write pulse, thus making the surge Minimize to a minimum. Similarly, the waveform of the write pulse according to the ground/fixed signal can be improved. Similarly, in the present invention, groups may be implemented differently depending on the respective zeros, using group indicators. 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, based on the size of the indicated area of the input NRZI data, and the size of the leading or trailing blank area, thus minimizing the glitch. 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.

9104092.ptd Page 17 1251227 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

9104092.ptd Page 18 1251227 Schematic description of the diagram 1 1 0 circuit drive descent circle _1 9104092.ptd第19页

Claims (1)

1251227 VI. Patent Application Range 1. A control method for a write pulse waveform for a high-density optical recording medium, wherein the write pulse is a change according to an energy value of a marked area and a blank area of the NRZ I signal to generate a corresponding The waveform of the pulse width is characterized in that the method is to offset the falling edge of the write pulse waveform at the time according to the energy value of the marked area and the energy value of the trailing blank area. 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 final pulse, and the write pulse waveform The falling edge is the falling edge of the last pulse. 3. The control method according to claim 1 or 2, wherein the offset of the falling edge is based on a combination of the energy value of the marked area at the time and the energy value of the trailing blank area, and backward or toward Front offset. 4. The control method according to claim 1 or 2, wherein the offset of the falling edge is based on the energy value of the marked area at the time and the energy value of the blank area of the Luoshang area. After the comparison, the corresponding offset is performed. 5. The control method according to claim 1 or 2, wherein the offset of the falling edge of the write pulse waveform is based on an MRZ I signal readable from a group table. The energy value of the marked area and the blank area, grouped according to different pulse sizes, and containing the falling edge offset value of the write pulse waveform with the NRZ I signal. 6. The control method according to claim 5, wherein the grouping table is divided into short pulses by the energy value of the current marked area of the input data on the recording medium and the energy value of the trailing blank area. group 9104092.ptd Page 20 1251227 VI. Patent Application Group, medium pulse group and long pulse group, and store the pulse width data of the last pulse corresponding to the pulse waveform. 7. The control method according to claim 5, wherein the offset value of the falling edge of the last pulse is read according to a combination of the energy value of the marked area and the energy value of the trailing blank area, and the last pulse is calculated. Pulse width data. 9104092.ptd Page 21