TW514877B - Method and apparatus of converting a series of data words into modulated signals - Google Patents

Abstract

The present invention relates to method and apparatus of converting a series of data words into modulated signals. This method generates for each data word a number of intermediate sequences by combining mutually different digital words with that data word, scrambles these intermediate sequences to form alternative sequences, translates each alternative sequence into a (d, k) constrained sequence, checks whether each (d, k) constrained sequence contains undesired sub-sequence of more than kSET ""0""s where kSET is smaller than k, and selects one (d, k) constrained sequence for recording on an optical or magneto-optical recording medium among the (d, k) constrained sequences not having the undesired sub-sequence, thereby recording edge information more frequently which will result in stable clock while conducting DSV control normally.

Description

514877 V. Description of the Invention (Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs, KK paper size, suitable financial standards (CNS) A4 specification (2g, A7, B7) Field of the invention: The present invention relates to a method of modulating a series of data characters into Method and device for (d, k) suppression sequence of well-suppressed direct current (DC) component. BACKGROUND OF THE INVENTION: Run length limited codes-generally expressed as (d, k) codes, which have been widely used and Successfully applied in today's magnetic and optical recording systems. Such a code and a device for performing the code have been disclosed in κ. A.

"Codes f0r Mass Data Storage by Schouhamer Immink

System ’’ (ISBN 90-74249-23-X, 1 999). The execution length limit code is an extension of the earlier non-reverted to zero recording return to zero recording; NRZ) code, where the binary number represents no (magnetic flux) change in the recording medium, and the binary digit 1 represents the recorded magnetic flux. The direction changes to the opposite direction. The above recording rules impose some additional restrictions on-(called word codes), that is, at least d's are recorded between consecutive occurrences ",", and these records are contained in continuous data "1" The number of "0" in the interval does not exceed k. When a series of ,,,, and are continuously recorded, the first restriction occurs to prevent internal code interference due to the push of the repetitive transition pulse. The second occurrence occurs when re-covering comes from ，， Lock ，， A phase-locked loop is the clock of the reproduced data for recurring transition. If a continuous, 0 ,, sequence η :: Middle gate does not appear at 1 o'clock, the clock regenerative phase-locked loop will be lost. Take u, 7) as an example, where at least some of τ 'and no more than 7 have been, ... 0 is between the adjacent of the recorded,, 0 ,, is between the recorded page 4 x 297 ^ 17 (Please read the note on the back first Item and then fill in this page)

Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Between the "1" of the invention description (). Through a modulation_2 (modul 2) integration effect, a series of coded bits 7G will be converted into a corresponding modulated signal, which is composed of the bit cells of the high or low signal value ,,! The bit represents a modulated signal that changes from a high signal: a low signal value, or from a low signal value to a high signal value. &Quot; ϋ 0 U indicates that the modulated signal has no state change. The small inversion period Tmin can be expressed as (d + 1) T, so it is 2T, where T is a bit time interval in the recording wave series. The maximum inversion period Tmax can be expressed as (k + 1) T, so it is therefore equal to a series of channel bit fields T · i P, which are generated by the (1,7) code, and are reversed to: Matter Γ: Big? : The second-order reversal cycle is also frequently observed. The edge information of the large number is generated in a short interval. For example, in many cases, 2T and 3T are conducive to the generation of clock signals: In the case of increased recording density, 'minimum inversion. — 20%-a problem. In other words, 'If the minimum execution 2T is generated consecutively, the recorded wave series is prone to change in the & Ϊ k 疋, because the 2T wave is fortunately smaller than the other wave output amplitude, and therefore, for example, the effect of defocusing and tangent slope. One-to-some factors In addition, in a high linear density, the continuous minimum standard of recording also makes it easy to interfere with, for example, the influence of noise. , P t, Therefore, when playing the data < operation, it will also easily become an error. In this case, Θ was observed to reproduce the wrong pattern of the shell material, such as the displacement of the front and back edges of the smallest two π 二 in some cases. Therefore, the length of the bit error ^ increases. As described above, when data is transmitted or recorded on a media group through a transmission line, this data will be reviewed before transmission or recording. J is suitable for transmission on page 5. The wood and paper dimensions apply the Chinese National Standard (CNS). ) A4 size (21 × 297 mm (please read the precautions on the back before filling this page)

514877 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention () Delivery code or one of the recording media coding sequences. If the result of the encoding sequence from the modulation contains a direct current (DC) component, various error signals such as the tracking error generated by the servo control mechanism that controls the disk drive will easily become prone to change or flutter. The first reason to use this DC-free signal is that the recording channel will not be positive; it often responds to low-frequency components. When the signal is read from the optical record carrier, the signal is recorded in its track, and the suppression of the low-frequency component in the signal is also highly helpful. 'Because then, continuous tracking and control of undisturbed recorded signals It is possible. Good suppression of low frequency components improves tracking with less disturbing audible noise. For this reason, it is worth the effort to prevent modulation sequences from containing possible DC components. In order to prevent the modulation sequence from containing DC components, it has been proposed to control the digital total value (DSV) to prevent the modulated signal from containing DC components. DSV is an integer found by adding a series of bit values, where the values +1 and -1 are designated as one of the series, 丨, and, 0, respectively, and it is generated after NRZI modulation of a series of channel bits. . Dsv is an indicator of the DC component contained in a series of sequences. The actual DSV indicates that the frequency spectrum of the signal does not include the frequency components in the low frequency region. It must be noted that DSV control is usually not applied to sequences generated by standard (d, k) codes. The DSV control of such a standard (d, k) code can be calculated by calculating the DSV of a series of coded bits after modulation in a predetermined time period and inserting a predetermined number of DSV control bits into the series of coded bits. carry out. In order to improve the code, page 6 This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) ---- ^ (Please read the precautions on the back before filling this page)

111— ---- II 丨 II Five printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 -------—__ Description of the invention () Efficiency, the number of DSV control bits must be reduced to a minimum possible value . Preferably, the encoded signal includes a sequence of q code characters, where q is an integer. Interpolated synchronization (spy signal) is between the encoded signal parts. Preferably, this synchronization signal does not occur in a sequence of encoded signals. Traditionally, the synchronization model contains a series of s coherent equal to logic, 0 ,, Bits, where s is an integer and is greater than k, or the synchronization model is composed of two series of k bits with logic "0", logic, 0 "is separated by one bit with-logic", also That is, two consecutively executed k ,, 0, .... The disadvantage of using this type of synchronization model is that it is relatively long, thus reducing the performance of the record. Therefore, it is better to use a short synchronization model, which can include a sequence Two or three consecutive, 0 ,, executions. An example of the use of such signals to record and read audio signals on an optical or magneto-optical green carrier is disclosed in US Patent Specification No. 4,501,000. In this manual, 8 to 14 (EFM) modulation systems are disclosed, which are used to record information on compact discs (CDs) or mini disks (MDs). EFM modulated signals can be converted into a series of 8-bit information characters into a series _ i 4 characters To obtain 'and its 3-bit merged characters are inserted between consecutive code-code characters. Each 4-bit winter code character satisfies at least d = 2 and at most k = 10,, 0 ,, , Which is arranged between two ,, 丨 ,,. In order to meet this situation and also between code characters, a 3-bit merge character is used. 8 possible 3-bit merge characters are allowed Four three-digit merged characters of the yuan, that is, "001", "010", `` 〇〇〇〇, and, i 〇〇, .. Residual possible 3-bit merger page 7 This paper applies to the paper size China National Standard (CNS) A4 Specification (210 X 297 Public Love) (Please read the precautions on the back before filling this page)

V. Description of the invention (words, that is, "1 1 1 ,,,,, 〇1 丨 ,, ^ ^ # ^ H 1 and 110" are not used, as it violates the d > 2 restriction of the rule. Four allowable Ren You Zushi Shi, (Please read the precautions on the back before filling this page) (° < will be selected in a moment, so that the place will be obtained after the cascading fork foot M Zhuang 丨 and mouth suppression characters The element string satisfies the (d, k) limit 'and its, ^ ^ ^ System 2 DSV will maintain a coherence constant. According to the above rule ^ U Muyang 疋 combining characters can reduce the low frequency of the modulated signal Composition. The choice of 3-bit merged characters ..... It depends on the demand, that is, 10,000 faces, to meet the channel signal. The solution of the EFM signal is very simple. The synchronization mode W " Between 33 replaceable 3-bit merged characters and 14-bit I-words. The U-bit synchronization model used in the CD format consists of two: consistently, 0, plus 3 Composed of bit merge characters. The choice of verb parallel characters avoids the occurrence of the synchronization model in the output sequence. The relative occurrence of the synchronization model in this format is All _ 5 88-bit 4 · 6 / 〇 and 2 7-bit ^. Decode skips 3-bit merged characters, and uses-lookup table or PLA to convert 14-bit characters into information bytes (8 (Bit). The Intellectual Property Bureau of the Ministry of Economic Affairs 'employee consumer cooperatives have certain requirements for printing information records to increase reading and writing speeds. However, the aim of increasing reading speed requires tracking institutions' high frequency of good service. Wide 'will set multiple strict restrictions on the suppression of low-frequency components in the recording signal in sequence. The improved suppression of low-frequency components is also conducive to suppressing audible noise from the tracking mechanism. For this reason, it is worth doing a variety Strive to prevent signals from containing low-frequency components. Page 8 This paper is sized to the Chinese National Standard (CNS) A4 (21 × 297 mm) 514877s A7 B7 V. Description of the invention () The purpose of the invention is as follows: The purpose is to provide a coding system capable of generating a corresponding sequence for each data element, and under the (d, k) code rule used for recording on a recordable medium, this sequence can suppress the DC component And does not contain a long execution of a synchronization model, a long string, 0, and a minimum execution length d. Another object of the present invention is to provide a method and device for converting a series of data characters into a modulated signal. More edge information is written under the rules of a (d, k) code, so that a channel clock can be stabilized during reproduction. The method of the present invention for converting a series of data characters into a modulated signal combines different signals from each other. In the case of digital characters and data characters, each data character is known to generate many intermediate sequences. This method can perturb each replaceable sequence to form a replaceable sequence, and replace each replaceable sequence according to a predetermined coding rate m / n. Transform into (d, k) suppression sequence, pick out the sequence that satisfies the sequence of (d, k) suppression sequence and its previous (d, k) suppression sequence, k, ， k A sequence, and one (d, k) suppression sequence selected from the selected sequences for recording on a recordable medium. According to the method for converting a series of data characters into a modulated signal according to the present invention, a combination of digital characters and data characters different from each other is used to generate a number of intermediate sequences for each data character. The replacement sequence converts each replaceable sequence into a (d, k) suppression sequence according to a predetermined coding rate m / n, and picks out the sequence in the conversion (d, k) suppression sequence, each sequence has between two " 1 ”, up to ksET ,, 〇 ,, executed, where kSET is less than k 'and selected in the selected sequence to record to a memorable page 9 This paper size applies the Chinese National Standard (CNS) A4 specification ( 210X297 mm) " ~ " " " " (Please read the precautions on the back before filling out this page) Order · Printed by A7 B7, Consumer Cooperatives, Intellectual Property Bureau, Ministry of Economic Affairs V. Invention Description () Recording Media The upper one (d, k) suppresses the sequence. (Please read the precautions on the back before filling this page.) Formula I Brief description The preferred embodiment of the present invention will be explained in more detail in the following explanatory text to fully explain the principle of the present invention. In the figure: Fig. 1 is a block diagram of an encoding system according to an embodiment of the present invention; Fig. 2 is a partial embodiment of an encoding scheme for performing augmenting and scrambling of digital characters Explanatory diagram; Figure 3 is a block diagram of a selector used in a coding system according to the present invention; Figure 4 is a schematic diagram of a general method for determining a replaceable sequence; Figure 5 is a replaceable (d, k) An illustration of the k-state determination operation of the suppression sequence; FIG. 6 is an embodiment in which a data character is divided into two data characters, and the two data characters are subsequently input to a generator; and FIG. 7 is based on A block diagram of a demodulator for demodulating one of the recorded (d, k) suppressed sequences of the present invention. Comparison of printed drawing numbers of employees' cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs: 19 user data 20 generator 21 replaceable sequence 22 selector 23, 51 (d, k) suppression sequence 24 pre-encoder 25 execution length limit sequence 40 increase Larger page 10 This paper size applies to China National Standard (CNS) A4 (210X297 mm)

42 Scrambler 52 Judging device 60 Execution length computer 64, 66 Decimal computer 103 Descrambler V. Description of the invention (41) Intermediate sequence 50 (d, k) encoder 54 Selecting device 62, 101 Synchronous detector 102 (d (K) The decoder 104 increases and eliminates the invention in detail i. The preferred embodiment will not be explained with the accompanying drawings as follows, so that the present invention can be fully understood. Figure 1 is a block diagram of an encoding system according to an embodiment of the invention. Using the -generator 20 and a selector 22, the encoding system converts the user data 19 into a _ (d, k) suppression sequence 23, in which a plurality of predetermined subsequences are completely missing or have a low probability of occurrence. A pre-encoder 24 is used to sequentially convert the (d'k) suppression sequence 歹 J 23 into one of the suppression low-frequency components to execute a length-restricted sequence 25. As shown in FIG. 1, the encoding system includes a generator 20, and a detailed block diagram thereof is shown in FIG. The generator 20 includes an increaser 40, and the increaser 40 generates a number of intermediate sequences 4? For each word τo by combining different digital characters and data characters 19 from each other. The booster 40 can generate an intermediate sequence 41 only by placing a digital character in front, middle, or rear of the data character 19. The generator 20 further includes a scrambler 42 for continuously perturbing the intermediate sequence 41 to form an alternative sequence 21. Page 11 This paper applies the Chinese National Standard (CNS) A4 specification (210X297mm) ..... Gold ......, OK ...... S (Please read the notes on the back before filling this page) Ministry of Economy Printed by the Intellectual Property Bureau Employee Consumer Cooperative 514877

V. Description of the invention (Selecting a group. The sequence between the digits 41 > 4η π 0th ^ The inclusion of mutually different digital characters affects the scrambler 42 and the 4g w 1 7 〇 at the beginning ... 4 "... It is preferably a self-synchronizing scrambler, and it will be initialized for female γ π a (Please read the precautions on the back before filling this page>

Each middle 41 having a different digital character. Therefore, the relatively complete randomization of the alternative sequence I, T, J, and X. Preferably, the increaser is in the early mountain and the mouth type, so that through combining all possible digital characters of length r and the data, the needle 19 is opened, and 2Γ intermediate sequences 41 are generated for each data character 19 . Name a, 4 > In this method, a selection group of alternative random sequences 2 1 can be obtained. FIG. 3 is a detailed block diagram of the selector 22. The selector 22 includes a (d, k) encoder 50i to convert the replaceable sequence into a (d, k) suppressed sequence 51. The replaceable sequence 21 is divided into q m-bit characters, where q is an integer. Under the rules of the (d, k) encoder 50, q m-bit characters will be transformed into q n-bit characters, where n > m. (D, k) The encoder 50 can be in a standard form with parameters m = 2, n = 3, d = i, k = 7 or alternatively m = l, n = 2, d = 2, k = 7 . The Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs prints better: 'Code 50 has parameters m = 9, n = 13, d = 1, or m-1 1, n = 16, 6, d = 1, or m = 1 3, n = 1 9, d = 1, so as to achieve a high coding performance. For related references, please refer to PCT Application No. PCT / KR00 / 01292 (corresponding to US Application No. 09 / 707,947) which has not yet been announced. The encoder 50 may also have parameters m = 6, n = l 1, d = 2, or m = l 1, n_20, d = 2, or m = 7, n = 1, 3, and d = 2. For related references, please refer to PCT / KR0 1/00359, which has not yet been published. The selector 22 further includes a device 52, which is used to apply the Chinese National Standard (CNS) A4 specification (21 × 297 mm) to each replaceable first paper size 514877 A7 Printed by the Employees' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs System 5. Description of the invention ((d, k) Squeeze sequence 5 1 'Confirm whether sequence 5 1 contains eight unintended subsequences such as synchronization model, a long series, 0, a long series < Replaceable

Tmin executes (⑽s). If observed—unexpected pre-1μ circuits will calculate penalty and combine with unexpected subsequences. The selector 22 further includes a device 52. The m 52 and the gray 52 are used to determine each alternative k, U, k) in the number of occurrences of the unexpected subsequence, and the suppression sequence 51. The unexpected subsequence is, for example, Synchronous model, or a long series: u, or a long series of alternative Tmin executions, and contribute the replaceable narrow sequence 21 to the low frequency component. Under the rules of disposition interpretation, it is determined that # 罟 to 疋 驮 Set 52 will give a lower treatment to the expected sequence and a higher treatment to the unexpected sequence. The selector η also includes means 54 for selecting the lowest-performing < alternative (d, k) suppression sequence 51. Fig. 4 is a schematic diagram of a general method for determining and selecting an alternative (d, k) suppression sequence 5 ... having the lowest treatment according to the present invention. As shown in Fig. 4, the reference setting device 52 includes a number of decimal computers for measuring the execution length 60, the occurrence of a specified synchronization model 62, the alternate Tmin execution length 64, and the low-frequency content 66 in parallel. The execution length decimal is measured as a coherent ,, 0 ,, (commonly referred to as "0" execution length) measured as a replaceable (d, k) suppression sequence 51. As mentioned above, when, 0, execution persists for a long period of time within a sequence, recorded features such as potholes and planes can become suppressively long, which can be harmful, making water vapor intolerable and errors are more likely will happen. Therefore, a longer '' 0 '' execution length is given higher treatment. Page 13 Please read the notes on the back 1 «Fill in · · I install the page I 1 \ 1 1 1 1 I order 514877 A7 V. Description of the invention (execute the length computer 60 to check whether or not k, ... ', no Will perform multiple sk) is satisfied with the coherence between two consecutive sequences (coherent previous sequences are stored in time, and this', 俶 if there is a new replaceable (dk, suppression sequence 51 entered, coherent ,, ()) Go over the previous and this new sequence, in other words, "吕," the execution length of the previous sequence, ps ~ ZR, and the execution length of the new sequence, CS-ZR, will be added. Then ~, check杳 Is the added value 'PS-ZR' + 'CS-ZR' greater than k. If 'PS —ZR' + 'CS —ZR'> k, the execution length computer 60 will suppress the new (d, k) Sequence 51 is flagged, otherwise, the sequence remains flagless. Figure 5 is a diagram of the k-request check operation. The execution length computer 60 may use ksET to replace the new coherence of the (d, k) suppression sequence. 〇 requirements, where ksET is less than k, and it is used in m / n of (d, k) encoder 50 In transition. With ksET less than k, the execution length computer 60 scans the internal coherence of each replaceable (d, k) suppression sequence, such as the coherent "0", connected to each adjacent sequence in order to check the replaceable ( d, k) The suppression sequence has whether the execution length of '0' is greater than ksET. If so, the execution length computer 60 will flag the current sequence and then provide this sequence to the selection device 54. Although less than (d, k) The critical value of k for modulation is set as a continuous '0' limit, because (d, k) suppression sequences 51 are generated. If the length r is large, there will be at least one (d, k) The suppression sequence has all consecutive, 0 ,, subsequences, and its length is equal to or shorter than kSET. Therefore, the edge information can be recorded more frequently than the k requirement. If used in (d, k) encoder 50 The data sheet with m / n conversion has the full 14th page. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 male «) (Qi Xian. Read the precautions on the back before filling out this page) Install tr --- ------ Consumption cooperation among employees of the Intellectual Property Bureau of the Ministry of Economic Affairs Print 514877 A7 B7 5. Description of the invention (for the conversion data required by k = 14, the execution length computer 60 will choose one from 9, 10, ", 12 and 13 as ^. If ^ is too Among the 2 replaceable sequences, there may not be a replaceable (d, k) suppression sequence that can meet the requirements of kSET. Therefore, too small ksET, such as less than 8, will be excluded from the selectable group. If (D, k) The data sheet of the encoder 50 has a conversion material that satisfies the requirement of k = 18, then kSET will be selected from 9 to 17. Decimal computer 64 measures the continuous Tmin (if deducted 1, Tmin is "〇1", if d = 2, Tmin is ,, 0〇 ,,) the number of execution lengths in order to eliminate the maximum change S (Maximum TransitiOn Run, MTR) has a limited number of repetitive, Tmin, sequences, such as, 〇〇〇〇〇〇〇〇〇〇〇1 ,, or "〇01 〇〇001 001001 ... ,, the sequence. Decimal The computer 64 will flag such a sequence 'It will be removed from the selected alternative sequence by the selection device 54. The synchronization detector 62 is used to detect the alternative (d, k) suppression sequence 5 i, Whether a specified synchronization model appears. In fact, if this synchronization model is detected, the synchronization detector 62 will flag the (d, k) suppression sequence 51, otherwise, the sequence will remain in a flagless state. The decimal computer 66 is used to measure the replaceable ((1,1 ^ pressed sequence 5 DSV) after the (d, k) pressed sequence $ 丨 has been modulated by a pre-encoding device. It is better to measure the change of DSV When the sequence is relatively long, its rain is usually one of the larger appropriate measurements over one hundred bits. Various decimal methods, synchronous detectors, and k-status flags are the inputs to select the clothes set 54. The selection device 54 will finally combine various inputs + Ding page 15 This paper size applies Chinese National Standard (CNS) A4 specifications ( 210 X 297 mm)

Please read the note on the back first 填 Fill in this page * I Order this page Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 514877 A7

V. Description of the invention () The number of vertebrae to make a decision so that the transfer sequence can be selected and recorded. In this decision, the flags of the judged device 52 今, 疋, 疋 1, 疋 1, 疋 1, 可 1 and 可 1 can be replaced (d, k). The flag of the suppression sequence will be removed. In a preferred embodiment of the present invention, a synchronization model is used, which is composed of at least two, 0 ,, runs, all of which are shorter than k. Therefore, coding performance will benefit from this relatively short synchronization model. Using the NRZI pre-encoding procedure, the replaceable (d, k) suppression sequence 51 which has been selected by the selector µ is converted into a modulated signal. Then, the modulated signal is generated by selecting (d, k) suppression sequence 51, and T of the composite modulus becomes a transition and '0, becomes non-transition, and is sent to the recording medium. At the same time, the length of the digital character is determined r, so that the bit length A of the data character 19 to which r is added is a multiple of m. For example, in the case of a coding rate m / n = 9/1 3, if a is 728, r satisfying various conditions is 1, 10, 19, ..., so that one of these values is selected as r. Consider the traditional DVD ECC block scheme, which uses a synchronized frame with 91 bytes of user data and a = 728. If 1 is selected as r 'and the number of digit characters of the input data character 19 is 2 (= 21), it will only generate two intermediate sequences 41. However, the selection device 54 may not necessarily obtain an expected alternative (d, k) suppression sequence 51 in these two sequences. Therefore, after complete randomization, if i〇24 (== 21l0j intermediate sequences 41 can provide at least one expected (d, k) suppression sequence, r = 10 is better. Page 16 This paper is applicable to this paper China National Standard (CNS) A4 Specification (210 X 297 Public Love) ----------- 丨 Installation (Please read the precautions on the back before filling this page) Order -------- -Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs /%

Description of the Invention (Member of the Intellectual Property Bureau of the Ministry of Economic Affairs and Consumer Cooperatives printed the above method and removed r-bit digital characters. Figure 7 is a block diagram of a demodulator that guides this kind of operation. Synchronous product 7 Figure 6 Another method is to select the length r. In this method, a = 728-bit input data character is divided into two 364-bit data characters 19, and these two data characters are subsequently provided to the enlarger 40. In order to be able to divide the e-cutter device, it is placed in front of the enlarger 40. If 364 + 5 (γ) 疋 9 (m) multiples, the increaser ㈣ is combined with 3 2 (= 25) which are different from each other. Each shellfish 70 1 9 generates a 3 2 1 sequence 41 for each 3 64-bit character. The 32 intermediate sequences 4 丨 will be output in parallel from each register of the booster 4 0. If The coding rate m / n = 6/11 and A = 728, satisfying a variety of conditions "θ 4! 〇, 16, .... Among these bit lengths r, 4 is better, because 16 (= 24 ) Intermediate sequences 41 may achieve reasonable randomization and require an appropriate number of registers. In the case of m / n = 6 / l 1, another way to choose the length Γ is to use 7 2 8 The bit input data characters are divided into 8 91-bit data characters' and sequentially supplied to the booster 40. In this separate embodiment, the best r is 5, because 91+ 5 (r) is a multiple of 6 (m). Therefore, 32 (= 25) digit characters and the intermediate sequence 41 are generated separately. In the above embodiment, it is preferable that the bit length Γ and the data word The length of element 19 is proportional. Therefore, if the length of data character 19 is less than the above example, r can be selected from the length of bits less than 5. The recorded data modulated according to the above method can be retained through guidance. Demodulator to restore, in other words, to continuously decode and descramble page 17 This paper size applies Chinese National Standard (CNS) A4 specifications (210X297 public love) —--------, may t (please first (Please read the notes on the back and fill in this page) 514877 Printed by the Consumer Property Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention () Detector 1 0 1 detects a synchronization code included in the sequence, and its frame size Is (A + r) * m / n + sync bit length, and is reproduced from the optical record carrier, and the detection is removed. Then, the frame size of the sequence 23 is (A + r) * m / n, and the sequence 23 that satisfies the (d, k) suppression will be provided to the decoder 102. 'The decoder 1 02 will Each η-bit character is decoded into the corresponding m-bit child '. Therefore, the frame size of the decoded sequence will become α + γ. The descrambler 103 will restore the decoded sequence to an intermediate sequence 4 1. The intermediate sequence 41 is the sequence before being perturbed. Then, the increase excluder 丨 〇4 will remove the r-bit digit characters' and the size of the output frame included in the front, middle, or rear of the original sequence. A raw data character 1 9. According to the method and device for converting a series of data characters into a modulated signal according to the present invention, under the rules of (d, k) code, a simple hardware that can be used to suppress the DC component of the coding system of the sequence, and exclude Synchronization model, long string of 0, and long execution with a small execution length d from the record sequence. In addition, under the specific (d, k) code system, the present invention can write more edge information to improve the stability of the reproduced clock and reduce the locking error. Although the present invention has been disclosed in the preferred embodiment as above, it should not be used to limit the present invention. Anyone skilled in the art can make various modifications and retouches without departing from the spirit and scope of the present invention. The scope of protection shall be determined by the scope of the attached patent application. The first paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) .....: 耋 ........., 玎 ......... Li (please (Read the notes on the back before filling out this page)

Claims (1)

514877, 8 8 8 8 ABCD VI. Patent Application Scope-1. A method for converting a series of data characters into a modulated signal. The method includes at least the following steps: ........— · (Please read first Note on the back, please fill in this page again.) (A) Combining different digital characters and the data character to generate a number of replaceable sequences for each data character; (b) According to a predetermined coding rate m / n, Transform each replaceable sequence into a (d, k) suppression sequence; and (c) choose in absolute judgment to have the lowest contribution to DSV (total number of digits) and use it in the conversion (d, k) suppression sequence One (d, k) suppression sequence recorded on a recordable medium. 2. The method according to item 1 of the scope of patent application, wherein the step (a) further disturbs each data character combined with one of the digital characters to form the replaceable sequence. 3. The method according to item 1 of the scope of patent application, wherein step (a) generates 2F replaceable sequences for each data character by combining all possible digital characters of length r and the data character. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 4. The method described in item 1 of the scope of patent application, wherein step (c) further includes the following steps: (cl) Provide the sum of each (d, k) suppression sequence Disposal of the spectral content in proportion to the frequency of occurrence of a predetermined subsequence of the (d, k) suppressed sequence; and (c2) the lowest place selected for recording onto the recordable medium. Page 19 This paper applies to China National Standard (CNS) A4 specification (210X297 mm) 514877 ABCD 々, (d, k) suppression sequence in one of the scope of patent application. (Please read the notes on the back before filling out this page) 5 · The method described in item 1 of the scope of patent application, where d = 1, m = 9, and n = 13. 6. The method as described in item 1 of the scope of patent application, where d = 1, m = 1 1 and n = 1 16. 7. The method described in item 1 of the scope of patent application, where d = 1, m = 13, and n = 19 〇 8. The method described in item 1, scope of patent application, where d = 2, m = 6 , And n = 11 〇9 · The method described in the first range of patent applications, where d = 2, m = l 1 and n = 2 0 〇 10. The method described in the first range of patent applications, Where d = 2, m = 7, and n = 13 〇 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 1 1 · As described in item 1 of the scope of patent application, one of them is incorporated into the selection (d, k) The execution of the synchronous model before or after the suppression sequence ,, 0, is performed shorter than k. Page 20 This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) 514877 8 8 8 8 ABCD VI. Application scope of patent 12 · The method described in item 1 of the scope of patent application, where this step (magic A sequence in which the minimum inversion period Tmin of the bit sequence is repeatedly repeated more than a predetermined number of times is removed from the transition (d, k) suppression sequence, and a (d, k) suppression sequence is selected, and the selected ( d, k) The repression sequence is recorded on a recordable medium. 1 3. —A device for converting a series of data characters into a modulated signal, the device includes at least: a generator for combining mutually different digital characters And the data character, generating a number of replaceable sequences for each data character; and a selector for converting each replaceable sequence into a (d, k) suppressed sequence according to a predetermined coding rate m / n , And choose in absolute judgment to have the lowest contribution to DSV (total number of digits) and to use this (d, k) suppression sequence to record one (d, k) suppression sequence on a recordable medium. 14 · If applying for a patent The device according to item 13, wherein the generator includes at least: an amplifier 'for generating a number of intermediate sequences for each data character by combining the digital character and the data character; and a scrambler A device for perturbing each of the generated intermediate sequences to form the replaceable sequence. 1 5 · The device as described in item 14 of the scope of patent application, wherein the increaser unit combines all possible digits of length r Yuan and this data character, the Chinese national standard (CNS) A4 specification (210X297 mm) is applicable to the paper size on page 21 ........ Feng: (Please read the precautions on the back-then fill out this Page}, --- Consumption Co-operative Cooperative of Intellectual Property Bureau, Ministry of Economic Affairs, 4877 A8 B8 C8 D8 Each data character in the patent application range generates Y intermediate sequences. Please read the note before filling in this page. 16. The device described in item 13 of the patent application scope, where the selector includes at least: a code A device for converting each replaceable sequence into a (d, k) suppression sequence in accordance with a predetermined coding rate m / n; a determining device for providing one of the disposals of each replacement suppression sequence which is proportional to the spectral content And the frequency of occurrence of a predetermined subsequence in the replaceable sequence; and a selection device that selects one of the (d, k) suppressed sequences for recording onto the recordable medium. 17. The device according to item 13 of the scope of patent application, where d = 1, m = 9 and n = 13 〇 1 8. The device according to item 13 of the scope of patent application, where d = 1, 1 1 N = 16 〇 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 19 · The device described in item 13 of the scope of patent application, where d = 1, m = 1 13 and n = 19 〇20. The device described in item 13 of the scope, where d = 2, m = 6 and n = 11 〇 page 22 This paper size applies Chinese National Standard (CNS) A4 specification (210X 297 mm) to Λ: w sound 7 storm 87 Yan Chong L48 Repair 5 ABCD Intellectual Property Bureau Employee Consumer Cooperatives printed the scope of patent application 21. The device described in item 13 of the scope of patent application, where d = 2, m = ll, and n = 20. 22. The device according to item 13 of the patent application, where d = 2, m = 7, and n = 13. 23. The device according to item 13 of the patent application, wherein a synchronization model is incorporated into the device. In the front or back of the selection (d, k) suppression sequence, the selection (d, k) suppression sequence consists of "0" executions shorter than k. 24. The device according to item 13 of the scope of patent application, wherein the selector removes the minimum inversion period Tmin of the bit sequence from the transition (d, k) suppression sequence. And select a (d, k) suppression sequence, and the selected (d, k) suppression sequence is recorded on a recordable medium. 25. An information recording medium having data modulated and recorded in accordance with the method described in item 1 of the scope of patent application. 26. A demodulation device for demodulating data modulated in accordance with the method described in item 1 of the scope of patent application. 27. — A method for converting a series of data characters into a modulated signal. The method includes at least the following steps: Page 23 This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) ... ....... ， 可 ......... (Please read the notes on the back before filling this page) 51 877 ABCD VI. Patent application scope Shellfish characters, for each guest Element generates a number of replaceable sequences; (b) transforms the substitutable replacement sequences according to a predetermined coding rate m / n '| a (d, k) suppression sequence; and ⑷ picks out the satisfaction that persists in the transition (d , K) · Between the driving sequence in the control sequence and its previous (d, k) suppression sequence, 〇 ”" < k executes the sequence with a length limit f !, and selects ten π μ in the selected sequence a has been recorded in one of the (d, k) suppression sequences that can be recorded on the media. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. Combine one of the digital characters with a perturbation, rob shellfish 70, to form the replaceable sequence. 29. Such as The method described in item 27 of the patent scope, wherein the step ⑷ generates 2F replaceable sequences for each data character by combining all possible digital characters of length r and the data character. 30.-a kind of series A method for converting a data character into a modulated signal, the method includes at least the following steps: (a) combining different digital characters and the data character to generate a number of replaceable sequences for each data character; (b) Convert each replaceable sequence into a (d, k) suppressed sequence according to the -predetermined coding rate m / n '; and (c) pick out the sequence in the converted (d, k) suppressed sequence, each sequence having:,: τ ........ 贽 ............ Order ............ r > Please read the note on the back first Matters refill this page} ___ Page 24 514877 The patent application range is between two "1" and up to kSET ,, 0 ,, executed, where ksET is less than k 'and one of the selected sequences is selected for recording on a recordable medium (d, k) suppression sequence. 31. The method according to item 30 of the scope of patent application, wherein the step (i) is further used to disturb,. . Each data character of the digital character to form the replaceable sequence. 32. The method as described in item 30 of the scope of patent application, wherein this step generates 2r alternative sequences for each data element by combining all possible digital characters of length Γ and the data character. 33. A device for converting a series of characters into a modulated signal, the device includes at least: a generating state for combining different digital characters and the data character to generate a quantity for each data character A replaceable sequence; and a selector 'for converting each replaceable sequence into a (d, k) suppressed sequence according to a predetermined coding rate m / n, and picking out the satisfaction that persists in the transition (d, k) The sequence in which the sequence in the suppression sequence and the previous (d, k) suppression sequence have a length-restricted sequence, and one of the selected sequences is selected for recording on a recordable medium (d, k) Squeeze the sequence. 34. The device as described in item 33 of the scope of patent application, wherein the generator includes data words which are further used to perturb one of the digital characters. Page 25 This paper applies Chinese National Standard (CNS) A4 specifications (210X 297mm) (Please read the notes on the back before filling out this page)-、 τ Consumer cooperation with the Intellectual Property Bureau of the Ministry of Economic Affairs. Printed by the agency V 514877 C8 D8 6. Apply for patent scope yuan to form this replaceable sequence. (Please read the precautions on the back before filling this page) 3 5. The device described in item 33 of the scope of patent application, where the generator passes all possible digital characters of length r and the data character, 21 ^ alternative sequences are generated for each data character. 3 6. —A device for converting a series of data characters into a modulated signal, the device includes at least: a generator for combining different digital characters and the data character to generate a quantity for each data character 'Replaceable sequences; and a selector for converting each replaceable sequence into a (d, k) suppressed sequence according to a predetermined coding rate m / n, and picking out the transition (d, k) suppressed sequence Sequence, each sequence has at most kSET executions between two `` 1 '', where kSET is less than k, and one of the selected sequences is selected for recording on a recordable medium (d, k) suppression sequence. 37. The device as described in claim 36, wherein the generator includes data characters further used to perturb one of the digital characters to form the replaceable sequence. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 3 8. The device as described in item 36 of the scope of patent application, wherein the generator passes all possible digital characters of length r and the data character to each data word The meta produces 21 * alternative sequences. Page 26 This paper size applies the Chinese National Standard (CNS) A4 specification (210 × 297 mm) 514877 A8 B8 C8 D8 VI. Scope of patent application 3 9. A kind of information recording media with the content described in item 27 of the scope of patent application Methods to modulate and record the data on it. 40. A demodulation device for demodulating data modulated in accordance with the method described in item 27 of the scope of patent application. "Installation -------- Order ------ (Please read the precautions on the back before filling out this page) Printed by the Consumers' Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs, page 27 This paper applies Chinese national standards (CNS) A4 size (210 X 297 mm)