Recoding carrier

The record carrier This application is a divisional application of the invention patent application filed on February 14, 1995 with the application number 95190261.X and the invention titled "record carrier and its reading device".

TECHNICAL FIELD The present invention relates to a record carrier comprising optically readable data patterns composed of marks of different lengths, said data patterns representing data words, additional first-type codewords and additional second-type codewords, first One codeword has a predetermined first relationship with a corresponding data word to form a first code, and the second codeword has a predetermined second relationship with a corresponding data word and the first codeword to form a second code, The predetermined first and second relationships can be corrected according to a predetermined algorithm. The data pattern is then divided into many addressable code groups. Each code group includes a control part containing a control data word and a user-provided control part. The data part of the data word.

The invention also relates to a recording device and a reading device of the record carrier.

2. Description of the Related Art Such record carriers and reading devices are commonly called, for example, CD-ROM (Compact Disc Read Only) and CD-ROM players.

The data provided by the user on the CD-ROM is recorded on the so-called main channel. In addition, the so-called sub-code path contains many addresses, in the form of the so-called absolute time code. The data on the main channel is divided into many code groups usually called sectors. Each sector is composed of a so-called sector header and a data part. The sector header includes the sector address corresponding to the absolute time code in the subcode path, and the data part contains the data provided by the actual user. Before the data is recorded on the CDROM, it goes through the so-called CIRC (Interleaved Lide-Solomon Code) processing process so that it can be corrected. In this process, the so-called P redundant code word and the so-called Q redundant code word are added. In addition, the data from the same sector is distributed to most of the recorded signals. The result of this distribution (also called interleaving) is that when the signal is read, the number of sectors

02122058.1 The first data is not used until the time necessary to read the data signal portion where the appropriate sector data words (and related P and Q redundant code words) have been distributed has passed. Contrary to the data on the main channel, the data on the subcode channel is used almost immediately. To quickly search for a sector with a specific address on the record carrier, the address data on the subcode path can be used. The disadvantage of recording on the sub-code path is that it ultimately reduces the space available for recording on the main path.

SUMMARY OF THE INVENTION The object of the present invention is to provide such a record carrier, the code group recorded on the record carrier can be quickly searched out without using a sub-code path.

The above-mentioned object is achieved by the record carrier described at the beginning. The record carrier is characterized in that the first type of codewords related to the data words of a related code group are distributed in data patterns corresponding to a plurality of recording code groups. On the first part, the data words of the code group and the second code words related thereto are distributed on the second part of the data pattern corresponding to a single recording code group.

Since the length of the data signal part where the data words of the code group are distributed is relatively small, the time required to find the data words of the control part of the code group used is relatively short. Although all the redundant data used for the control part of the data words (these words may have been erroneously received) have not yet arrived at this time, these still (partially) uncorrected data words are usually enough to be reliably used to retrieve records The control part of the code group on the carrier preferably contains data words representing addresses. The present invention is not limited to this, and the control part combined or not combined with the address data can also contain other control data that needs to be used quickly in the reading process.

Another embodiment of the record carrier is characterized in that the control part contains additional data words having a predetermined relationship with the data words in the control part, and the type of errors in the data words of the control part can be detected based on the data words and the additional data words.

Because of the additional data words, the wrongly received data words in the control part can be detected, so that the process of searching based on the wrong control data can be avoided.

The record carrier of the present invention can be read by a reading device comprising a reading device for reading the data signal recorded on the record carrier, characterized in that the reading device has first and second error correction devices, According to the attached first and second

02122058.1 The first type of codeword corrects errors in the data word, and also has a connection with the error correction device to collect the first type of codeword from the first part of the code group and the data word, and the related data from the second part The second type of codeword device.

The record carrier of the present invention can be recorded by a recording device comprising a writing device for recording a data signal representing a data word on the record carrier, characterized in that the recording device has first and second errors An encoding device to add the first and second codewords; a device for subdividing the data signal into a number of addressable code groups; and an interleaver, which is connected with the error correction device to connect the first type of codeword Are distributed to the first part, and the data words of the code group and the second type of code words related thereto are distributed to the second part.

BRIEF DESCRIPTION OF THE DRAWINGS The content of the present invention will be further described with reference to FIGS. 1 to 4 below. Among them: Figure 1 shows the data signal; Figure 2 shows the format of the data signal; Figure 3 shows the conversion device for converting the data into a modulated signal suitable for recording; Figure 4 shows the detection from the record carrier A data recovery device that recovers data from the signal.

DETAILED DESCRIPTION FIG. 1 shows a data signal subdivided into code group 1. Each code group is composed of synchronization part 2 or 3 and data part. There are many n-bit data words in the data part. In the embodiment described here, n is equal to 8. These n-bit data words are also called (data) bytes. Each code group 1 is divided into group 4 consisting of q code groups. The value of q may be 4 or 16, for example. The data signal is to be recorded on a record carrier, for example, a record carrier of the optically detectable type. However, it can also be recorded on other types of record carriers, such as magnetic carriers. Before recording, the data words are expanded to include error-correctable redundant code words. Then, the data words and the additional redundant code words are converted into a modulated signal. The performance of this modulated signal is adjusted to be suitable for recording it on the record carrier. In the modulated signal, the data words and the additional redundant code Words are represented by a series of codes that specifically determine data words and code words. Data words and code words are converted into

02122058.1 The method of modulating the signal can be the one described in European Patent Application 94200387.2 (PHN14.746). However, other modulation methods can also be used, for example, the so-called EFM modulation method (eight to fourteen modulation methods) can also be used. The synchronization parts 2 and 3 in the modulated signal preferably use codes that are not used for data words and additional code words. In addition, the synchronization part 2 registered in the first code group 1 of each group preferably uses a different code from the synchronization part 3 in the other code group 1 of the group 4.

Figure 2 shows the preferred embodiment of the block 1 format in more detail. In the format shown in the figure, each byte (data word) is grouped in rows, and each row has four bytes. From the left of these lines, you can see the serial number of the first byte of the line. In the top column, the position of each byte in the column is indicated by the numbers "+ 0, "+1, "+ 2 and + 3. The position of the first four bytes indicated by "synchronization in the format is preparation It is used for the synchronization part 2 or the synchronization part 3. In addition to the "synchronization" part, the code group also includes the control part 20 (bytes "4" to "11") and the data part (bytes "12" up to the code group 1 The last byte, including the last byte). The control part has three bytes, and all three bytes have a sector address. The control part can contain other near control data, which are usually contained in the discs In the subcode path. The bytes containing these data are called "subcodes." These bytes preferably include bytes representing the so-called copyright level. The control part also includes the so-called "mode" byte, which indicates the type of format. "The value of the byte is different from the value used by the CD-ROM.

The "position in group" byte indicates the position of the relevant sector in the group.

In addition, the control section 20 preferably contains 20 CRC (Cyclic Redundancy Code Correction) bytes. The relationship between these bytes and other bytes in the control part is predetermined, so that the wrong transfer of the control part bytes can be detected. This relationship can be the one detailed by J. Watkinsoη in the book "Digital Audio Technology" (ISBN 0-240-51270-7).

The data portion 21 has a subtitle, such as a subtitle used in a data code group divided into a CD-ROM or CD-I signal. In addition, the larger part of the data portion is formed by bytes containing data provided by the actual user (user data). The data part 21 may also contain many bytes EDC (error detection code) having a predetermined relationship with other bytes in the data part, and with these bytes, the transfer of erroneous data can be detected.

02122058.1 First, in the above format, the boundary between the control section 20 and the data section 21 is selected so that the subtitle belongs to the data section 21. However, the boundary can also be completely selected so that the subtitle belongs to the control section 20.

Fig. 3 shows an embodiment of a recording device which can be used to record a block format signal as shown in Fig. 2 on a record carrier. The recording device has a code group formatter 30 for formatting the data to be recorded provided by the user in the format shown in FIG. 2 and in a general manner. Thus, all code groups except for the synchronization part 2 or 3 have been formed.

The code group formed by the code group formatter is added to a so-called universal interleaver, which rearranges the order of the bytes of each code group, that is, the bytes of various different code groups are interleaved. For a detailed description of this staggered arrangement, please refer to the above-mentioned "Digital Audio Technology" book, more specifically, refer to page 466 of the book. The interleaver 31 is followed by a C2 decoder 32, which adds Q redundant bytes to the interleaved sequence of data bytes in the manner described in Chapter 7 of the book. The interleaved data bytes and Q redundant bytes are added to the deinterleaver 33. The deinterleaver 33 rearranges the order of the interleaved data bytes and the additional Q redundant bytes, so that the order of the data bytes is restored to The original sequence on the output of the formatter 30. The Q-plus bytes belonging to a certain sector of data bytes are now distributed on a large area. The data bytes and Q redundant bytes generated by the deinterleaver are added to the C1 encoder, and the so-called P redundant bytes are added by the C1 encoder in a similar manner as described in Chapter 7 of the above-mentioned "Digital Audio Technology" book. To the received byte. The resulting sequence consisting of data bytes, additional Q redundant bytes and additional P redundant bytes is added to a universal modulator circuit 35, and the modulator circuit 35 converts the received byte sequence into A modulated signal adapted to the performance of the record carrier on which the data is to be recorded. In addition, the modulator adds synchronization parts 2 and 3 to the modulated signal. Synchronization parts 2 and 3 can be generated by the generator 37 is added to the modulator 35. The modulator 35 may be a general modulator, such as the one called an EFM modulator, but this modulator may also be another modulator as described in Ouyi Patent Application 94200387.8 (14.746). The modulated signal generated by the modulator 35 is recorded on the record carrier 36 in a conventional manner (for example, a disc-shaped record carrier that is optically detectable, and the modulated signal is recorded on the record carrier in the form of optically detectable data).

02122058.1 The first is to synchronize the signal processing process (this is done by each part of the device shown in Figure 3), the recording device is equipped with a clock signal generator 38 to generate clock signals for each part.

Figure 4 shows a reading device for reading data recorded on a record carrier. The reading device has a reading head (not shown in the figure) for scanning the data pattern appearing on the record carrier and converting it into a corresponding analog detection signal. The detection signal is applied to a so-called limiter 40, which converts the analog detection signal into a corresponding binary readout signal. The binary read signal is applied to the clock extraction circuit 41 to extract the clock signal from the binary detection signal. The binary detection signal is applied to the demodulation circuit 42 to convert the binary detection signal into a sequence of data bytes, P and Q redundant bytes. In addition, the demodulation circuit detects the synchronization parts 2 and 3. The demodulator 42 feeds a signal indicating that the synchronization part 2 or the synchronization part 3 has been detected to the signal line 44. The data bytes and additional P and Q redundant bytes are added to a circuit composed of a C1 decoder 45, an interleaver 46, a C2 decoder 47, and a deinterleaver 48 in sequence. The interleaver 46 rearranges the order of the received bytes in the reverse order that the deinterleaver 33 rearranges the bytes. The deinterleaver 48 rearranges the order of the received bytes according to the reverse order that the interleaver 31 rearranges the bytes. The C1 and C2 decoders detect and correct the erroneous data bytes according to the P and Q redundant bytes. The corrected data bytes are added to the code group deformatter 49, which classifies the various data bytes in the code group, and transmits these data to the data processing device (not shown in the figure). To simplify code group 1 open The signal generated by the demodulator 42 indicating the detected synchronization part 2 or 3 is added to the code group formatter through the delay circuit 51. The function of the delay circuit 51 is to delay the signal by a period of time and the device 45, The delay of the circuit composed of 46, 47 and 48 is equivalent.

In addition, the device shown in FIG. 4 also has a control circuit 52, which generates a plurality of clock signals synchronized with the clock signal extracted by the clock extraction circuit, and adds them to each device of the device to make these devices work synchronously.

Due to the use of the interleaver 46 and the deinterleaver 48 that reversely rearranges the data bytes, the order of the data bytes generated by the demodulator 42 corresponds to the order of the corrected data bytes generated by the deinterleaver 48. That is to say, at the output of the demodulator 42, the number of the entire code group 1

02122058.1 The first data byte is generated at the same time. The advantage is that even if the data bytes of the control part of the code group 1 are not corrected, they appear on the output of the demodulator 42 basically immediately after the bytes after the synchronization part 2 or 2 are read. The control part includes data used when searching for code groups recorded on the record carrier 1. Due to the rapid appearance of bytes, it is possible to quickly find the desired code group 1 on the record carrier based on the data bytes appearing at the output of the demodulator 42.

The C1 decoder corrects individual errors according to the additional P redundancy bytes. Therefore, it is better not to use the data bytes appearing at the output of the demodulator 42 but to use individual error-corrected data bytes to control the search process. In order to separate the control part (this is the part that must be used to control the search process), the reading device has a circuit 50, which means that the demodulator has detected that the signal of the synchronization part 2 or 3 and the data bytes processed by the C1 decoder are added To the circuit. The data separated by the circuit 50 is transferred to a device (not shown in the figure) for controlling the search process of the code group 1 on the record carrier 36. The upper circuit 50 preferably includes an error detector to control the part 20 in accordance with the code group 1 CRC (Cyclic Redundancy Check) byte detects whether the received control part byte is wrong. This reduces the possibility of erroneously received signals for searching the code group 1 on the record carrier 36.

02122058.1