CN1208765C - Method for determining the maximum storage capacity of an optical information recording medium - Google Patents

Abstract

The present invention provides a method for determining the maximum storage capacity of an optical information recording medium. The optical information recording medium has a preformed groove, and a predetermined address code is marked on the preformed groove. The present invention determines the maximum storage capacity of the optical information recording medium based on a last actually existing predetermined address code among the detected predetermined address codes. Finally, the time value represented by the last actually existing predetermined address code detected is expressed as the maximum storage capacity of the optical information recording medium.

Description

Method for determining the maximum storage capacity of an optical information recording medium

technical field

The present invention provides a method for determining the maximum storage capacity of an optical information record medium (Optical information record medium), and in particular, the optical information recording medium has a pregroove on which a pregroove is formed. Marked with predetermined address codes (Predetermined address codes), for example, absolute time codes (Absolute Time InPregroove codes, ATIP codes) in preformed grooves.

Background technique

Today's optical information recording media, such as CD-R, CD-RW, DVD-R, DVD-RW, etc. can be written to optical discs, as well as magneto-optical discs (MO-disk) and similar recording media, etc., and the writing method Usually a pre-groove is first formed on the recording medium. A predetermined address code, such as an ATIP code, is marked on the groove, which is used to provide a tracking basis for an optical information recording/reproducing apparatus (such as an optical disc recorder), thereby assisting in recording/reading data. Basically, the aforementioned predetermined address code is represented by a time value. Please refer to U.S. Patent No. 5,226,027, and "Compact Disc Recordable System Description" published by Philip Company in 1997 ( Yellow Book, third edition), its detailed technical content will not be repeated here.

Most of the optical information recording media mentioned above will comply with the standard and provide information about the last possible predetermined address code (Last possible predetermined address code) as a suggested value of the maximum storage capacity of the optical information recording media. Usually, information about the last possible predetermined address code is pre-recorded in the file management area on the optical information recording medium. Taking CD-R as an example, in the yellow book that regulates its standard, the information indicating the last possible ATIP code is recorded in detail as the third special information (Special information 3). However, it should be emphasized that the above information about the last possible predetermined address code corresponds to the maximum storage capacity of the optical information recording medium, and is only a suggested value rather than the actual maximum storage capacity. However, in reality, most optical information recording media still have predetermined address codes in addition to the last predetermined address codes after the manufacturing is completed.

Generally, when a user intends to use an optical information recording/reproducing device to record data on an optical information recording medium, the optical information recording/reproducing device will first judge and read information about the last possible predetermined address code, and then use the last The maximum storage capacity corresponding to the possible predetermined address code (only the recommended value of the maximum storage capacity) is used as the basis for the program of data recording.

However, in practical applications, the amount of data that the user intends to record on the optical information recording medium often exceeds the maximum storage capacity (suggested value) corresponding to the last possible predetermined address code. Taking CD-R as an example, the maximum storage capacity corresponding to the last possible predetermined address code provided by the specification is 74 minutes. However, it should be noted that as far as CD-R is concerned, every minute of data recorded is equivalent to 9.2 megabits of data recorded. That is to say, if the last possible predetermined address code provided by the specification is used as the maximum storage capacity of the optical information recording medium, the storage capacity will be wasted.

Even more unfortunately, when the above situation occurs, if the recording data is carried out in a Disk-at-once (DAO) mode, data recording failure will occur; ) mode, the last track recording failure will occur, or the storage capacity will be wasted.

In view of the above situation, some existing optical information recording/reproducing devices provide users with the function of ignoring the maximum storage capacity recommended by the specifications, and directly record the amount of data that the user intends to record on the optical information recording medium. Although the above method is practical and convenient, it is also because the optical information recording/reproducing device does not know the actual maximum storage capacity of the optical information recording medium used, so if the amount of data to be recorded is greater than the actual maximum storage capacity of the optical information recording medium, will cause the record to fail.

Contents of the invention

Accordingly, an object of the present invention is to determine the actual maximum storage capacity of an optical information recording medium in order to effectively utilize the storage capacity of the optical information recording medium.

The present invention provides a method for determining the maximum storage capacity of an optical information recording medium, and in particular, the optical information recording medium has a pre-formed groove on which and marked with a predetermined address code, for example, Absolute timecode in preformed grooves. Through it, the storage capacity of the optical information recording medium is effectively utilized.

According to a first preferred embodiment of the present invention, a method for determining a maximum storage capacity of an optical information recording medium is provided. The optical information recording medium has a preformed groove on which a plurality of continuous predetermined address codes are marked. According to the method of the first preferred embodiment of the present invention, firstly, continuous scanning is performed along the preformed groove until a last actually existing predetermined address code among the plurality of predetermined address codes is detected. Subsequently, a time value represented by the detected last actually existing predetermined address code is expressed as the maximum storage capacity of the optical information recording medium.

According to a second preferred embodiment of the present invention, a method for determining a maximum storage capacity of an optical information recording medium is provided. The optical information recording medium has a preformed groove on which a plurality of continuous predetermined address codes are marked. A predetermined information is recorded on the optical information recording medium and indicates a predetermined address code that may exist last among the plurality of predetermined address codes. According to a second preferred embodiment of the present invention, first, the predetermined information is extracted from the optical information recording medium. Then, according to the extracted predetermined information, scan along the pre-formed groove, and search for the last possible predetermined address code. Then, starting from the last possible predetermined address code, scanning is continued along the preformed groove until a last actually existing predetermined address code among the plurality of predetermined address codes is detected. Finally, a time value represented by the detected last actually existing predetermined address code is expressed as the maximum storage capacity of the optical information recording medium.

According to a third preferred embodiment of the present invention, a method for determining a first maximum storage capacity of a first optical information recording medium is provided. The method is determined using a second maximum storage capacity of the second optical information recording medium, which is determined in advance and provided in advance. According to a third preferred embodiment of the present invention, firstly, it is judged whether the first optical information recording medium is identical to the second optical information recording medium. Next, if the judging result is affirmative, it is determined that the first maximum storage capacity is equal to the second maximum storage capacity.

Description of drawings

The advantages and spirit of the present invention can be further understood from the following detailed description of the invention and the accompanying drawings.

FIG. 1 shows the structure of an optical information recording/reproducing apparatus 1 to which the present invention is applicable.

Fig. 2 shows the flow of the first preferred embodiment of the present invention.

FIG. 3A shows the flow of a specific embodiment of scanning the pre-formed groove and judging the last actually existing predetermined address code.

FIG. 3B shows the flow of another specific embodiment of scanning the pre-formed groove and judging the last actually existing predetermined address code.

FIG. 3C shows the flow of another specific embodiment of scanning the pre-formed groove and judging the last actually existing predetermined address code.

Fig. 4 shows the flow of the second preferred embodiment of the present invention.

Fig. 5 shows the flow of the third preferred embodiment of the present invention.

Detailed ways

Please refer to FIG. 1 , which discloses a schematic diagram of the structure and electronic components of an optical information recording/reproducing device 1 applicable to the present invention. In this illustrative example, the optical information recording/reproducing apparatus 1 is in a form capable of optically recording a signal in standard CD format or RDAT format onto the optical information recording medium 116 . The optical information recording medium 116 can be provided in the form of a radiation-sensitive layer composed of a phase change material or a dye, for example.

The optical information recording medium 116 also provides tracking modulation (Tracking modulation), as servo tracking (Servo tracking), for assisting in recording information patterns (Information pattern). The tracking modulation is often performed in the form of a wobble track, that is, a wobble pregroove is pre-formed on the optical information recording medium 116 for the wobble track. In the wobble track, the frequency is modulated to coincide with an address signal representing a predetermined address code marked in the wobble track in advance, for example an address in the form of an ATIP code or the like.

An optical read/write head 105 of a conventional form is disposed on the reverse side of the optical information recording medium 116 . The optical information recording medium 116 rotates around an axis 102, and the read/write head 105 can move radially relative to the recording medium 116 by a conventional positioning device. As shown in FIG. 1 , an embodiment of the positioning device may be composed of a motor 103 and a spindle 104 . The read/write head 105 can be used to record information patterns and can be used to read information patterns if functionally required. In order to achieve the required functions of the read/write head 105 described above, the read/write head 105 comprises a semiconductor laser for generating a radiation beam 107a whose intensity can be varied by a driver circuit 107a.

In a known method, the radiation beam 107a is aimed at the servo tracking of the optical information recording medium 116 . The radiation beam 107a is partly reflected back by the optical information recording medium 116, the reflected radiation beam being modulated to coincide with the wobble tracking and if an information pattern is present. It is also modulated to match the information pattern. The reflected radiation beam is passed directly to a pair of radiation-sensitive detectors 108a, which generate a pair of radiation-modulated read signals V1. The read signal V1 contains a component resulting from the wobble tracking and has a frequency of approximately 22 kHz theoretical scanning speed.

The motor speed of a motor 100 is controlled by a motor control circuit 108 so that the frequency of the component of the read signal V1 produced by wobble tracking is approximately 22 kHz. The motor 100 and a turntable 101 form a device for driving the recording medium 116 to rotate around the axis 102 . The read signal V1 is also loaded to a detection circuit 109 which derives the ATIP code from the component of the read signal V1 produced by wobble tracking and loads the ATIP code to a control unit. In one embodiment, the control unit includes a microprocessor 110 . Furthermore, the read signal V1 is loaded to the amplifying circuit 111, and the amplifying circuit 111 has the characteristic of high pass, so as to block the signal component generated by the wobble tracking in the read signal VI. The read signal V1 from which the low frequency components have been removed is then loaded to the analysis circuit 65, and the analysis circuit 65 indicates the quality of the read information patterns. An example of the analysis circuit 65 will be described in detail below.

The evaluation signal Va at the output of the evaluation circuit 65 is also applied to the microprocessor 110 . The optical information recording/reproducing device 1 further includes a commonly used CIRC (Cross interleaved Reed-Solomon codes) encoding circuit 112, and the signal Vi intended to be recorded can be loaded to the CIRC encoding circuit 112 through a switch 115. The switch 115 is controlled by the microprocessor 110 . The CIRC encoding circuit 112 is arranged in series with a conventional EFM modulator 113 . The EFM modulator 113 itself has an output connected to the driver circuit 107 . The driver circuit 107 is of conventional and controllable form, by which parameters affecting the quality of the recorded information pattern can be adjusted. For example, one of the above mentioned parameters may be the intensity of the radiation beam during formation of the information pattern. In the example given above, the information pattern is then formed with radiation pulses having a fixed duration, and the duration of the radiation pulses can be an important parameter affecting the quality of the information pattern.

In the case of magneto-optical recording, the strength of the magnetic field generated in the area of the recording medium scanned by the radiation beam can be an important parameter. In order to achieve the purpose of generating a test pattern, the recording device 1 may include a test signal generator 114. The test signal generator 114 generates, for example, a random digital signal or a signal corresponding to a digital signal value of zero (digital silence). . However, it has to be noted in principle that the data signal can also be used to form a test pattern. The signal generated by the test signal generator 114 is loaded to the CIRC encoding circuit 112 through the switch 115 . The switch 115 is a commonly used switch, which either transmits the signal Vi to record or transmits the output signal of the test signal generator 114 according to the control signal from the control unit 110 . In addition, in order to detect the high frequency component in the read signal V1 , the optical information recording/reproducing device 1 further includes a high frequency detector 120 disposed between the head 105 and the microprocessor 110 .

The present invention determines that the optical information recording medium 116 or a similar optical information The maximum storage capacity of recording media, etc. It should be emphasized that the above-mentioned optical information recording medium 116 or similar optical information recording medium has preformed grooves, and a plurality of continuous predetermined address codes, such as ATIP codes, etc. are marked on the preformed grooves. In the following, the optical information recording medium 116 will be taken as an illustration example, and the spirit and features of the present invention will be clearly pointed out according to several preferred embodiments of the present invention.

The flow according to the first preferred embodiment of the present invention is shown in FIG. 2 . This first preferred embodiment is used to determine the maximum storage capacity of the above-mentioned optical information recording medium 116 or similar optical information recording medium or the like. According to the first preferred embodiment of the present invention, step S20 is firstly performed to set initial conditions and the like. Then step S22 is executed, and continuous scanning is performed along the pre-formed groove of the optical information recording medium 116 . Next, step S24 is executed, and step S24 judges whether a last actually existing predetermined address code among the plurality of predetermined address codes is detected.

If the determination result of step S24 is negative, return to step S22. If the judgment result of step S24 is affirmative, that is, the last actually existing predetermined address code is detected, then step S26 is executed. Step 26 expresses a time value represented by the last detected predetermined address code as the maximum storage capacity of the optical information recording medium 116 .

Taking a CD-R as an example of the application description of the above-mentioned first preferred embodiment, if the time value represented by a last actually existing predetermined address code detected by it according to the first preferred embodiment is 86 minutes, then the The maximum storage capacity of this CD-R is indicated as 86 minutes.

Regarding the scanning procedure in step S22 and the method of judging the detection of the last actually existing predetermined address code in step S24, there are several ways as follows. In a specific embodiment, as shown in FIG. 3A , step S22 to step S24 first execute step S30a1 to detect the plurality of predetermined address codes one by one. Next, step S30a2 is executed to determine whether the last actually existing predetermined address code among the plurality of predetermined address codes is detected. If the judgment result of step S30a2 is affirmative, step S22 to step S24 are completed. If the judgment result of step S30a2 is negative, return to step S30a1.

The above method of detecting the plurality of predetermined address codes one by one can ensure accurate detection of the last actually existing predetermined address code, but it is quite time consuming. Therefore, another method that saves time can be adopted. As shown in FIG. 3B, in another specific embodiment, step S22 to step S24 first execute step S30b1, and use a predetermined address code interval as a fixed interval to detect the number of address codes. predetermined address code. Next, step S30b2 is executed to determine whether the predetermined address code can still be detected. If the determination result of step S30b2 is affirmative, it will go to step S30b1. If the judgment result of step S30b2 is negative, step S30b3 is executed, and the last detected predetermined address code is regarded as the last actually existing predetermined address code.

The above method of detecting the plurality of predetermined address codes with a predetermined address code interval as a fixed interval can shorten the detection time, but cannot accurately detect the last actually existing predetermined address code. Therefore, the above two methods can be combined to detect the plurality of predetermined address codes, as shown in Figure 3C, in another specific embodiment, step S22 to step S24 first execute step S30c1, with a predetermined address code interval The plurality of predetermined address codes are detected for regular intervals. Then step S30c2 is executed to determine whether the predetermined address code can still be detected. If the determination result of step S30c2 is affirmative, it will go to step S30c1. If the judgment result of step S30c2 is negative, step S30c3 is executed, and the last detected predetermined address code is used as the detection starting point. Next, step S30c4 is executed to detect the predetermined address codes extended by the plurality of predetermined address codes one by one. Next, step S30c5 is executed to determine whether the last actually existing predetermined address code is detected. If the judgment result of step S30c5 is affirmative, step S22 to step S24 are completed. If the judgment result of step S30c5 is negative, then return to step S30c4. By means of this, the detection time can be shortened, and the last actually existing predetermined address code can be detected accurately.

As mentioned above, the predetermined information about the last possible predetermined address code is recorded on the general optical information recording medium. Another method of the present invention is applied to the predetermined information about the last possible predetermined address code, and the detailed process is described in the second preferred embodiment. The flow according to the second preferred embodiment of the present invention is shown in FIG. 4 . This second preferred embodiment is used to determine the maximum storage capacity of the above-mentioned optical information recording medium 116 or similar optical information recording medium, etc., and a predetermined information has been recorded on the optical information recording medium 116, the predetermined information indicating the plurality of predetermined One of the last possible predetermined address codes in the address codes. According to the second preferred embodiment of the present invention, step S40 is first performed to set initial conditions, etc. Next, step S42 is executed to extract the predetermined information from the optical information recording medium 116 . Then step S44 is executed, scanning along the pre-formed groove according to the extracted predetermined information, and searching for the last possible predetermined address code. Then step S46 is executed, starting from the last possible predetermined address code. Next, step S47 is executed to continue scanning along the pre-formed groove. Next, step S48 is executed, and step S48 judges whether a last actually existing predetermined address code among the plurality of predetermined address codes is detected.

If the judgment result of step S48 is negative, then return to step S47. If the judgment result of step S48 is affirmative, that is, the last actually existing predetermined address code is detected, then step S49 is executed. In step S49 , a time value represented by the detected last actually existing predetermined address code transition is represented as the maximum storage capacity of the optical information recording medium 116 .

Regarding the procedure of scanning in step S47 and the method for judging the detection of the last actually existing predetermined address code in step S48, steps S30a1 to S30a2 shown in FIG. 3A can be used or steps S30b1 to S30b3 shown in FIG. 3B can be used. . Alternatively, steps S30c1 to S30c5 shown in FIG. 3C may be used.

In order to use the present invention more conveniently, another approach of the present invention is to determine in advance the maximum storage capacity of each type of optical information recording medium produced by each manufacturer, and to store the maximum storage capacity of each type of optical information recording medium produced by each manufacturer. The format information (including type information, manufacturing information) and its corresponding maximum storage capacity information are pre-stored. For the optical information recording medium whose maximum storage capacity is intended to be determined, the format information of the optical information recording medium is first interpreted, and then compared to the identical optical information recording medium, according to the pre-stored maximum storage capacity corresponding to each type of optical information recording medium For data, directly determine the maximum storage capacity of the optical information recording medium that is exactly the same as the optical information recording medium, which is the maximum storage capacity of the optical information recording medium. Regarding the above method, the optical information recording medium whose maximum storage capacity has been determined in advance is taken as an example below, and the detailed process will be described in detail in the third preferred embodiment.

The flow according to the third preferred embodiment of the present invention is shown in FIG. 5 . This third preferred embodiment is used to determine the maximum storage capacity of the above-mentioned optical information recording medium 116 or similar optical information recording medium, etc., and the optical information recording medium intended to determine the maximum storage capacity is hereinafter referred to as the first optical information recording medium. medium, the maximum storage capacity of the first optical information recording medium is referred to as the first maximum storage capacity. The method according to the third preferred embodiment of the present invention is determined using the maximum storage capacity (hereinafter referred to as the second maximum storage capacity) of the second optical information recording medium, which is determined and provided in advance.

According to the third preferred embodiment of the present invention, step S50 is firstly executed to set initial conditions and so on. Next, step S52 is executed to determine whether the first optical information recording medium is identical to the second optical information recording medium. If the judgment result of step S52 is affirmative, step S54 is executed to determine that the first maximum storage capacity is equal to the second maximum storage capacity.

In a specific embodiment, the first optical information recording medium has first form information and is recorded on itself, and second form information about the second optical information recording medium is provided in advance. Step S52 first extracts the first form information from the first optical information recording medium, then judges whether the first form information is equal to the second form information, if the judgment result is positive, then confirms that the first optical information recording medium is compatible with the first form information The second optical information recording medium is identical.

In the practical application of the third preferred embodiment, except for the second optical information recording medium, the format information and the corresponding maximum storage capacity of each type of optical information recording medium produced by other manufacturers are determined in advance and provided in advance. . If the judgment result of the above-mentioned step S52 is negative, then carry out the comparison and judgment between the first optical information recording medium and various types of optical information recording media manufactured by other manufacturers until it is judged that the optical information recording medium is different from the first optical information recording medium. For the identical optical information recording medium, then determine that the first maximum storage capacity of the first optical information recording medium is equal to the maximum storage capacity previously determined by the identical optical information recording medium.

Regarding the determination of the maximum storage capacity of the second optical information recording medium and other types of optical information recording media produced by various manufacturers, it can be determined according to the above-mentioned first preferred embodiment of the present invention or the second preferred implementation of the present invention example to determine respectively. In the process of determining the maximum storage capacity of the second optical information recording medium and other types of optical information recording media manufactured by various manufacturers, regarding the scanning procedure for the pre-formed grooves of the optical information recording medium and the last actually existing The method for judging the predetermined address code detection can adopt steps S30a1 to S30a2 shown in FIG. 3A. Alternatively, steps S30b1 to S30b3 shown in FIG. 3B may be used. Alternatively, steps S30c1 to S30c5 shown in FIG. 3C may be used.

Obviously, from the above detailed description of the preferred embodiments of the present invention, it can be clearly seen that the spirit and main features of the present invention are to determine the optical information according to the last actually existing predetermined address code on the detected optical information recording medium. The maximum storage capacity of the recording medium to avoid loss of the maximum storage capacity determined by the last possible existing predetermined address code.

Based on the detailed description of the preferred embodiments above, it is hoped that the features and spirit of the present invention can be described more clearly, rather than the preferred embodiments disclosed above are intended to limit the scope of the present invention. On the contrary, the intention is to cover various modifications and similar arrangements falling within the scope of the presently claimed claims. Therefore, in the specific embodiments of the present invention mentioned above, in addition to being applicable to CD-R, it can also be widely implemented in CD-RW, DVD-R, DVD-RW, MO and similar functions. on the disc. It is intended that the scope of the appended claims of the present invention be interpreted on the basis of the above description in the broadest way so as to cover all possible changes and similar arrangements.

Claims (10)

1. method that is used for determining the maximum storage capacity of optic informating recording medium, described optic informating recording medium has pre-formation groove, is marked with a plurality of continuous presumptive address sign indicating numbers on described pre-formation groove, and described method comprises the following step:

(a) along the continuous sweep of described pre-formation groove, in these a plurality of presumptive address sign indicating numbers is last

In esse presumptive address sign indicating number is detected; And

(b) with a time value table of detected last in esse presumptive address sign indicating number representative

Be shown the maximum storage capacity of described optic informating recording medium.

2. the method for claim 1, a plurality of presumptive address sign indicating numbers that wherein are marked on the described pre-formation groove are the pre-absolute time code that forms in the groove.

3. method as claimed in claim 2, wherein step (a) is carried out through the following steps:

(a1) detect this a plurality of presumptive address sign indicating numbers one by one; And

(a2) these a plurality of presumptive address sign indicating numbers of continuous detecting are detected until described last in esse presumptive address sign indicating number.

4. method as claimed in claim 2, wherein step (a) is carried out through the following steps:

(a1) be that fixed intervals detect this a plurality of presumptive address sign indicating numbers with presumptive address intersymbol distance, be detected until a presumptive address sign indicating number that can be detected at last; And

(a2) the described last presumptive address sign indicating number that can be detected is considered as described last in esse presumptive address sign indicating number.

5. method as claimed in claim 2, wherein step (a) is carried out by the following step:

(a1) be that fixed intervals detect this a plurality of presumptive address sign indicating numbers with presumptive address intersymbol distance, be detected until the last presumptive address sign indicating number that can be detected; And

(a2) begin to detect one by one the last presumptive address sign indicating number of these a plurality of presumptive address sign indicating numbers from the described last presumptive address sign indicating number that can be detected, be detected until described last in esse presumptive address sign indicating number.

6. method that is used for determining the maximum storage capacity of optic informating recording medium, described optic informating recording medium has pre-formation groove, on described pre-formation groove, be marked with a plurality of continuous presumptive address sign indicating numbers, one predetermined information is recorded on the described optic informating recording medium and indicates a presumptive address sign indicating number that may exist at last in these a plurality of presumptive address sign indicating numbers, and described method comprises the following step:

(a) extract described predetermined information from described optic informating recording medium;

(b),, and hunt out the described presumptive address sign indicating number that may exist at last along described pre-formation groove scanning according to the predetermined information that is extracted;

(c) from the described presumptive address sign indicating number that may exist at last, continue scanning along described pre-formation groove, a last in esse presumptive address sign indicating number in these a plurality of presumptive address sign indicating numbers is detected; And

(d) time value of detected last in esse presumptive address sign indicating number representative is expressed as the maximum storage capacity of described optic informating recording medium.

7. method as claimed in claim 6, the a plurality of presumptive address sign indicating numbers that wherein are marked on the described pre-formation groove are the pre-absolute time code that forms in the groove, and are recorded in the interior absolute time code of pre-formation groove that the predetermined information indication on the described optic informating recording medium may exist at last.

8. method as claimed in claim 7, wherein step (c) is carried out through the following steps:

(c1) detect this a plurality of presumptive address sign indicating numbers one by one; And

(c2) these a plurality of presumptive address sign indicating numbers of continuous detecting are detected until described last in esse presumptive address sign indicating number.

9. method as claimed in claim 7, wherein step (c) is carried out through the following steps:

(c1) be that fixed intervals detect this a plurality of presumptive address sign indicating numbers with presumptive address intersymbol distance, be detected until a presumptive address sign indicating number that can be detected at last; And

(c2) the described last presumptive address sign indicating number that can be detected is considered as described last in esse presumptive address sign indicating number.

10. method as claimed in claim 7, wherein step (c) is carried out by the following step:

(c1) be that fixed intervals detect this a plurality of presumptive address sign indicating numbers with presumptive address intersymbol distance, be detected until a presumptive address sign indicating number that can be detected at last; And

(c2) begin to detect one by one the last presumptive address sign indicating number of these a plurality of presumptive address sign indicating numbers from the described last presumptive address sign indicating number that can be detected, be detected until described last in esse presumptive address sign indicating number.

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