RU2248622C2 - Optical data carrier, method and recording device for optical data carrier, and also method and playback device for optical data carrier - Google Patents

Abstract

FIELD: data carriers.

SUBSTANCE: in optical data carrier, including track, including multiple recesses, formed on basis of first data being subject to recording, and platforms, formed between adjacent recesses, these recesses are recorded with deformation on basis of second data. First and second data are synthesized and played for realization of sound playback with broad frequency range. Also, first data are recorded with possible playback by means of common disc player. Playback of first data is controlled by second data for protection of recorded data.

EFFECT: higher efficiency.

6 cl, 44 dwg

Description

FIELD OF THE INVENTION

This invention relates to an optical recording medium having second data recorded thereon as auxiliary data in addition to the first data being the main data, to a method and apparatus for recording auxiliary data together with the main data on this optical recording medium, and also to a method and a device for reproducing an optical recording medium having first and second data recorded thereon.

In particular, the present invention relates to an optical recording medium in which the shape of a plurality of recesses of a track containing recesses representing recording data, and the areas between these recesses, are deformed to record other data, to a recording method and an apparatus for recording data on an optical recording medium, and also to a method and apparatus for reproducing an optical recording medium.

State of the art

To date, an optical disc, such as a compact disc with a diameter of 12 cm, is widely used as an optical recording medium having sound information recorded thereon, such as music numbers.

When recording to an optical disc, audio data is sequentially collected in blocks and added with an error correction code. The resulting data is subjected to EFM modulation (eight to fourteen modulation), and the modulation result is recorded using NRZI modulation (recording without returning to zero with inversion). Sound data is recorded on a compact disc by repeating notches and pads with nine different lengths of periods from 3T to 11T, where T is the base period equal to the channel beat period.

The notches formed on the optical disc based on the audio data have a length in the direction of the track of about 0.87 to 3.18 μm for a period of 3T to 11T, and the width of the notches in the direction perpendicular to the direction of the track is about 0, 5 microns at a depth of about 0.1 microns.

Currently, audio data is recorded on a CD in the frequency range from 20 Hz to 20 kHz. However, the requirement is to record audio data in a wider frequency range to ensure playback of audio data with higher sound quality. In addition, there is a requirement to record the audio data of three or more channels instead of two channels, i.e. left and right channels to provide mixed sound reproduction, such as ambiophonic reproduction.

In addition, there is a requirement that audio data recorded on an optical disc can be reproduced only under specified conditions to protect recorded audio data.

SUMMARY OF THE INVENTION

The objective of the invention is the creation of an optical recording medium that provides mixed playback by recording auxiliary data in addition to the main data, a method and apparatus for recording data on this optical recording medium, as well as a method and apparatus for reproducing an optical recording medium.

Another objective of the present invention is to provide an optical recording medium that reproduces at least the main data using a conventional optical disc reproducing apparatus, and on which auxiliary data is written in addition to the main data, and a method and apparatus for recording data on this optical recording medium.

Another objective of the present invention is the creation of an optical recording medium that provides recording audio data with a frequency range wider than that of conventional compact discs, or reproducing multi-channel recording with high sound quality, and a method and apparatus for recording data on this optical medium records.

Another objective of this invention is to provide an optical recording medium that provides reliable protection of recorded data, and a method and apparatus for recording data on this optical recording medium.

To solve this problem, according to the invention, an optical recording medium is created that includes a track formed by a plurality of recesses formed on the basis of the recorded first data and areas between the recesses in which the plurality of recesses are deformed based on the second data.

According to the invention, there is also provided a recording device for an optical recording medium including an objective lens for converging a recording laser beam output at a modulator output for modulating a recording laser beam emitted by a light source for emitting a recording laser beam based on the first and second incoming data data on an optical recording medium. This recording device includes a processor for processing signals to generate first data based on the main data recorded on the optical recording medium and to create second data based on auxiliary data for the main data recorded on the optical recording medium.

According to the present invention, there is also provided a reproducing apparatus for an optical recording medium, wherein the reproducing apparatus includes an optical head for reading first and second data from an optical recording medium including a track formed from a plurality of recesses based on the first data and pads formed between adjacent recesses, the recesses being deformed based on second data; a first demodulator for demodulating the first data of the optical recording medium based on the output signals of the optical pickup; and a second demodulator for demodulating second data of the optical recording medium based on the output signals of the optical pickup. The second demodulator includes a demodulation processor for demodulating an output signal of a recognition unit for recognizing a level of a reproducing signal provided by a signal processing processor.

The reproducing device preferably also includes a synthesizing unit for synthesizing the output signal of the first demodulator and the output signal of the second demodulator. The reproducing device also includes an external device recognizing unit for recognizing whether the connected external device is a registered external device. The reproducing device produces at least the output signal of the second demodulator if the external device connected to the reproducing device is recognized by the recognition unit as a registered external device.

The optical pickup head preferably includes a photodetector divided in the track direction of the optical recording medium into at least a first part of the photodetector and a second part of the photodetector. The reproducing device also includes a processor for processing the output signals of the first and second parts of the photodetector. A total signal representing the sum of the output signals of the first and second parts of the photodetector is supplied to the first demodulator from the signal processing processor, while a difference signal is presented from the signal processing processor to the second demodulator, which represents the difference between the output signals of the first and second parts of the photodetector.

According to the present invention, there is also provided a reproducing apparatus for an optical recording medium including an optical head for reading first and second data and recognizing data from an optical recording medium including a track formed by a plurality of recesses formed on the basis of the first data and pads, formed between adjacent recesses, the recesses being deformed based on the second data. The optical recording medium also has identification data recorded thereon. The reproducing device for the optical recording medium also comprises a first demodulator for demodulating the first data of the optical recording medium based on the output signal of the optical read head, a second demodulator for demodulating the second data of the optical recording medium based on the output signal of the optical reading head and a controller for controlling the operation of the second demodulator based on identification data read by the optical pickup head from the optical recording medium.

According to the present invention, there is also provided an optical recording medium including a data recording area having a spiral path formed by a plurality of recesses formed on the basis of the first data and pads formed between adjacent recesses, and a control data area for recording control data therein for the first data recorded in the data recording area. At least a plurality of recesses recorded in the control zone are previously deformed based on the second data.

The first data is preferably digital data recorded on an optical recording medium, while the second data is auxiliary data for digital data. Ancillary data is data that contains at least copyright data.

The first data is preferably represented by the high order bits of the digital data recorded on the optical recording medium, while the second data is represented by the lower order bits of the digital data.

In the control data area, identification data is preferably recorded indicating whether or not the second data is recorded on the optical recording medium.

The first data recorded on the optical recording medium is preferably encoded, while the second data is recorded as key data for decoding the first data.

According to the present invention, there is also provided a method for recording onto an optical recording medium, which includes modulating a recording laser beam generated by a light source with the first and second data, converting a modulated recording laser beam onto an optical recording medium using an objective lens to form a track including at least a plurality of recesses obtained on the basis of the first data, and pads formed between the recesses, and deformation of the recesses formed on pticheskom recording medium on the basis of second data. The first data is created on the basis of the main data recorded on the optical recording medium, while the second data is created on the basis of the auxiliary data on the main data recorded on the optical recording medium.

According to the present invention, there is also provided a method for reproducing an optical recording medium, including reading first and second data from an optical recording medium including a track formed from a plurality of recesses formed on the basis of the first data and pads formed between adjacent recesses, the notches are deformed based on the second data; demodulating the first data of the optical recording medium based on an output signal obtained by reading data from the optical recording medium; and demodulating second data based on playback signals read from the optical recording medium.

The level of the playback signals read from the optical recording medium is preferably recognized for demodulating the second data.

The demodulated first and second data are preferably synthesized together and output.

In this reproducing method, at least the demodulated second data is output and reproduced if an external device connected to the reproducing device is recognized as a registered external device.

According to the present invention, there is also provided a reproducing method for an optical recording medium including demodulating first data based on reproducing signals read from an optical recording medium including a track formed from a plurality of recesses created from the recorded first data and pads, formed between adjacent recesses, and a plurality of recesses are deformed on the basis of second data, moreover, on the optical recording medium there are identification data recorded on him; and demodulating second data based on playback signals read from the optical recording medium based on recognition of identification data read from the optical recording medium. If the identification data recorded on the optical recording medium indicates that second data is recorded on the optical recording medium, then the second data is demodulated based on data read from the optical recording medium.

Brief Description of the Drawings

Other objectives and advantages of this invention follow from the following description with reference to the accompanying drawings, which depict:

figure 1 is a block diagram of a recording device for an optical disk according to this invention;

figa-2D - the structure of the track on which the recesses are formed on the optical disk prepared in the recording device according to this invention;

figure 3 is a block diagram of a reproducing device used to reproduce an optical disc according to this invention;

figa and 4B - playback data obtained by the reproducing device shown in figure 3;

figa-5D - structure of the track containing the recesses formed on the optical disk reproduced by the reproducing device shown in figure 3;

6A-6D show a track structure containing recesses formed on an optical disk according to a second embodiment of the present invention;

7A and 7B show a structure of recesses formed on an optical disk according to a fourth embodiment of the present invention, in a plan view;

figa and 8B - the structure of the recesses formed on the optical disk according to the sixth embodiment of the present invention, in top view;

figa and 9B - the structure of the recesses formed on the optical disk according to the seventh embodiment of the present invention, in a top view;

figa and 10B - the structure of the recesses formed on the optical disk according to the eighth embodiment of the present invention, in top view;

11 is a block diagram of a photodetector forming an optical pickup used in a reproducing apparatus according to this invention;

figa-12E - the structure of the recesses formed on the optical disk according to the ninth embodiment of the present invention, in a top view;

figa and 13B - the structure of the recesses formed on the optical disk according to the tenth embodiment of the present invention, in top view;

figa and 14B - the structure of the recesses formed on the optical disk according to the eleventh embodiment of the present invention, in a top view;

Fig - the structure of the recesses formed on the optical disk, according to another variant implementation of the present invention, in a top view;

Fig - the middle part of the recesses formed on the optical disk according to the fourth embodiment of the present invention, deformed in the longitudinal direction based on the second data, in a top view;

Fig. 17 shows an output signal obtained by reproducing the optical disc shown in Fig. 16;

Fig - optical disc, according to this invention, in perspective.

Preferred Embodiments

The following is a detailed description of an optical recording medium, a method and apparatus for recording an optical recording medium, and a method and apparatus for reproducing an optical recording medium with reference to the drawings.

(1) Recording device

First, a description is given of a recording device for recording on an optical recording medium according to this invention. For the manufacture of an optical disk according to this invention, a master disk 2 exposed by light using the recording device 1 shown in FIG. 1 is first developed and plated to produce a mother disk, which is then used to make an optical disk. For the manufacture of an optical disk, a compact disk matrix is formed from the mother disk and a metal forming device is used that supports this matrix to form the disk substrate. Then, a reflective film is applied to the formed disk substrate.

A master disk 2 exposed to light using the recording device shown in FIG. 1 is prepared by applying a light sensitizer to a flat glass substrate. The master disk 2 is mounted on the electric motor 3 and rotated at a constant speed by the electric motor 3, driven into rotation under the control of the servo circuit 4 of the electric motor drive. At this time, the generator FG connected to the electric motor 3 generates a signal FG, the level of which increases in the interval of a given angle of rotation. The tracking circuit 4 rotates the electric motor 3, so that the signal FG has a predetermined frequency, which leads to the rotation of the master disk 2 with a constant linear speed.

The recording laser 5 is made, for example, in the form of a gas laser and emits a laser beam with a given light power. The light modulator 6 is made in the form of an electro-acoustic optical element with the ability to modulate the intensity of the laser beam L coming from the recording laser 5, so that the intensity of the laser beam L intermittently increases with increasing level of the control signal S3. The light modulator 6 changes the light power of the laser beam L depending on the level of the control signal S3.

The mirror 8 changes the path of the laser beam L for emitting light in the direction of the master disk 2. The lens 9 of the lens converts the light reflected by the mirror 8 onto the surface of the master disk 2. The mirror 8 and the lens 9 of the lens move sequentially in the radial direction using a slide mechanism (not shown) synchronously with the rotation of the master disk 2. As the mirror 8 and lens 9 are fed in, the optical disk recorder 1 sequentially moves the position of convergence of the light of the laser beam L from the inner edge to the outer edge master disk 2 for education on the master disk 2 passing spiral or concentric paths. At this time, a notch chain is formed on this track, consisting of a plurality of notches corresponding to modulating signals. This chain of recesses is modulated in width using the control signal S3.

The analog-to-digital conversion circuit 10 converts the audio signal SA supplied from a given music source to output DA 18-bit audio data in parallel with a sampling frequency of 44.1 kHz.

The bitwise processing unit 11 divides the 18-bit DA audio data into the first D2U data consisting of 16 high-order bits and the second D2L data consisting of 2 low-order bits. The first D2U data corresponds to the audio data recorded on a regular CD. The second D2L data is auxiliary data to the first D2U data and may be, for example, high-frequency audio data not contained in the first D2U data.

The TOC data (table of contents) recorded in the input region of the optical disc is supplied to the data processing circuit 12, and it processes this TOC data in accordance with the format prescribed for a conventional CD. This allows the data processing circuit 12 to create output channel data corresponding to the notch chain.

To the TOC data recorded in this manner, disc ID identification data is added, indicating that the DA audio data containing the second D2L data in the form of high-frequency audio data, and ripping IC identification data indicating that the optical is recorded on the optical disc the disk is an original optical disk made from the mother disk. By recording the identification data of the disc ID, it is possible to detect them during playback to enable playback of DA audio data processed as the upper 16 bits and the lower 2 bits, based on the detection results. Based on the identification data of the IC copy, it is also possible to determine whether or not the optical disc is a disc containing DA sound data copied from the original optical disc.

Similarly, the data processing circuit 12 processes the first D2U data received from the output of the bitwise processing unit 11 in accordance with the format set for a conventional CD to create output channel data D3 corresponding to the notch chain. The output channel data D3 corresponding to the notch chain is generated and output. The data processing circuit 12 adds an error correction code to the first D2U data to alternate the resulting data for EFM modulation of the processed results. In EFM modulation, the data processing circuit 12 generates 14 channel bits with a period 14 times the base period T from each byte of the first D2U data, as shown in FIG. 2A, and connects the 14-bit data with 3 connecting channel bits. The data processing circuit 12 NRZI modulates this serial data chain to generate output channel data D3, as shown in FIG. 2B. At this time, on a regular CD, the laser beam L is turned on and off under the control of the output channel data D3 to form a chain of recesses with a recess width of 0.5 μm.

In addition, the data processing circuit 12 performs processing corresponding to the processing unit of the first 16-bit high D2U data to add an error correction code to the lower 2-bit second D2L data. Then, the data processing circuit 12 interleaves the received data to convert the interleaved data into serial data. At this time, the data processing circuit 12 adds an error correction code by adding 4 bits of a simple parity flag. Thus, the data processing circuit 12 collects audio data obtained from the senior first data D2U and the lower second data D2L in the form of modules of 4 bits to form a block of six data (24 bits) to add 4 parity bits to each block. The data processing circuit 12 alternates each block containing six data (24 bits) and a parity flag (4 bits) and adds 4 parity bits to the alternating block.

The data processing circuit 12 converts the thus created sequence of bits into a serial data chain. In the period from the conversion of the logical level of the data D3 of the output channel to the logical level corresponding to the notch, to its conversion to the logical level corresponding to the area formed between the notches, the data processing circuit 12 generates and outputs the light power control data D4 in accordance with the logical level of serial data.

The control circuit 13 receives the output channel data D3 of the data processing circuit 12 to generate a control signal S3, depending on the level of which the laser beam L is intermittently increased in accordance with the logical level of this output channel data D3.

Using the recording device 1, the highest 16 bits of the 18 bits making up the DA audio data supplied to the device 1 are recorded as a notch chain consisting of a plurality of notches P ₁ on the master disk 2, so that the higher 16 bits will be reproduced by the reproducing device designed to play a regular CD.

The control circuit 13 intermittently enlarges the laser beam L with the light power control data D4 to generate the control signal S3, so that the width W ₂ in the direction perpendicular to the track direction changes and becomes narrower than the normal width W ₁ in accordance with the control data D4 light power. This leads to the recording of the second D2L data recorded on the optical disc in the form of changes in the width of the notch in the direction perpendicular to the direction of the track.

When the light power control data D4 is recorded in this way using the notch width, the upper signal value or the lower signal value is changed in accordance with the light power control data D4. In this example, the width of the notches is modulated by 0.5 ± 0.1 μm, so if the upper or lower magnitude of the signal changes, as shown in FIGS. 2A-2D, then the 16-bit first D2U data will be reproduced with sufficient amplitude tolerance in the reproducing A device designed to play a regular CD.

(2) Disc playback device

The following is a description of a reproducing apparatus for selectively reproducing an optical disc according to the present invention with data recorded thereon and a conventional compact disc.

When the optical disk 21 is installed in the reproducing device 20, as shown in FIG. 3, the device 20 rotates the optical disk 21 at a constant linear speed by means of an electric motor 22 to obtain a playback RF signal received from the reading optical head 23 as a reference signal.

The optical pickup 23 used in this reproducing apparatus 20 illuminates the optical disk 21 with a laser beam using the semiconductor laser used therein, used as a light source, to receive the light beam reflected from the optical disk 21 with a tuned light receiving element. The optical pickup 23 outputs an output RF signal at the output, the level of which changes in accordance with the intensity of the returned light beam received by the photosensitive surface of the light receiving element. The playback RF signal changes in level in accordance with a recess P ₁ or a pad R ₁ formed on the optical disk 21, while changing its upper or lower value depending on the width of the recess formed on the optical disk 21.

Circuit 24 amplifies the reproducing RF signal with a given gain to obtain the final RF reproducing signal at the output. In the initial state, the selective circuit 25 provides a playback RF signal received from the output of the circuit 24 to the EFM demodulation circuit 26. However, if the disc recognition circuit 27 detects that the mounted optical disc 21 is an optical disc having not only the first D2U data recorded thereon, but also the second D2L data according to the present invention, then the selective circuit 25 supplies a playback RF signal to the recognition circuit 28 the level of the RF playback signal under the control of the disc recognition circuit 27.

If the mounted optical disk 21 is a conventional optical disk 21, then the EFM demodulation circuit 26 performs two-level recognition of the playback RF signal received from the output of the circuit 24 to generate playback data. The EFM demodulation circuit 26 also performs EFM demodulation of the reproduction data to output demodulated data. If, on the contrary, the disc recognition circuit 27 detects that the supplied optical disc 21 is an optical disc according to the present invention, then the EFM demodulation circuit 26 performs EFM demodulation of the reproduction data received from the output of the reproduction signal level recognition circuit 28 of the reproduction circuit 27 disc recognition, for the output of demodulated data. At this time, the EFM demodulation circuit 26 outputs reproducing data corresponding to the repetition of the notches and pads regardless of whether the supplied optical disc 21 is an optical disc according to the present invention or a conventional compact disc.

The CIRC decoder 29 (cross-interleaved Reed-Solomon code) decodes the output of the EFM demodulation circuit 26 and corrects the output from errors using the error correction code added during recording to reproduce the audio output D4.

The reproducing apparatus 20 according to the present invention outputs the audio data D4 in 16-bit format regardless of whether the mounted optical disc 21 is a conventional compact disc or an optical disc according to the present invention using the same signal processing as in a reproducing apparatus for reproducing a conventional CD. Immediately after installing the optical disk 21, the playback RF signal can be processed in a similar manner, while the variable information recorded in the input zone of the optical disk 21 can be reproduced and output to a system controller including a disk recognition circuit 27.

Similar to the EFM demodulation circuit 26, the RF signal level recognition circuit 28 of the reproducing RF produces two-level recognition of the reproducing signal received from the output of the circuit 24 to create playback data and supplying the reproduced data to the EFM demodulation circuit 26. The reproduction RF signals are obtained from the optical disk 21 according to this invention, in which the width W of the recesses is modulated by the second data D2L, so that the upper or lower value of the reproduction RF signal changes with the width W of the recesses, as shown in FIGS. 4A and 4B.

If the width W _{1 of the} notch for logical 1 data with improved quality is 0.6 μm, and the width W _{2 of the} notch for logical 0 data with improved quality is 0.4 μm, then the lower value of the RF signal reproduction is equal to B _H for the width W _{1 of the} notch 0.6 μm and B _L for a recess width W ₂ of 0.4 μm, as shown in FIG.

Thus, the level 28 recognition of the signal of the playback RF corrects the threshold sample value of the first data D2U for two-level recognition of the signal RF playback, so that the result of the two-level recognition does not change even when changing the upper or lower value of the signal RF playback. The playback RF signal level recognition circuit 28 sequentially detects the level of the upper value B _H or lower value B _{L of} the playback RF signal to sequentially detect the level of the playback RF signal in the center of each recess. On the other hand, the RF signal level recognition circuit 28 of the reproduction corrects the signal level detection results using the notch length of the first data D2U obtained by two-level recognition to normalize the signal level detection results depending only on the notch width.

Thus, with a notch period of about 4T or less, the reproduction RF signal modulated based on the second D2L data has an upper or lower value that varies depending on the period, so if the notch length is equal to or greater than 5T, then the top or the lower value is presented as the saturation value, i.e. like level B _L. The RF signal level recognition circuit 28 of the reproduction RF multiplies the signal level recognition result by a predetermined constant corresponding to the notch length P ₁ in the first data D2U. Namely, the RF signal level recognition circuit 28 of the reproduction multiplies the result of the signal level recognition by a predetermined constant proportional to the notch length P ₁ in the first D2U data, such as 1, if the notch length in time is at least 5 T, or a constant inversely proportional to the length notches if the notch length is at least 4T. Namely, the level X of the playback RF signal corresponding to the length of the recesses shown in FIG. 4B is normalized to level B _L. The RF signal level recognition circuit 28 of the playback RF outputs the results DP of normalizing the signal level recognition to the two-level demodulation circuit 30.

The two-level demodulation circuit 30 performs two-level recognition of the DP results of normalized signal level recognition based on a predetermined threshold value, for example, the average THL level between level B _L and level B _H , for reproducing second data. Namely, the two-level demodulation circuit 30 outputs 1 or 0 as the second data if the results of the DP normalized signal level recognition are lower or higher than the threshold value THL, respectively.

The error detection and correction decoder 31 corrects errors in the playback data received from the output of the two-level demodulation circuit 30, and removes the rotation of the received data for reproducing and supplying the output of 2-bit second data D2L (D6). If the mounted optical disc 21 is a regular CD, and the audio data D6 is processed exclusive-OR in the mixer 35, as will be explained below, then instead of the 2-bit second data D2L, a 2-bit logical “00” is output. If the audio data D6 is processed with multiplication in the mixer 35 by a given random number, then a chain of 2-bit data is sequentially output.

Multiplexer 33 (MUX) adds 2-bit parallel second D2L data received from the output of the error detection and correction decoder 31 to the low-order bits of the 16-bit parallel first D2U data received from the output of the CIRC decoder 29 to supply 18-bit parallel audio data. This provides the output of the multiplexer 33 (MUX) audio data DAEx, providing high-quality sound reproduction with a wide frequency range, provided that the optical disk 21 is an optical disk according to this invention.

Mixer 35 (MIX) processes the lower two bits of 16-bit parallel audio data received from the output of the CIRC decoder 29, with each bit of the second D2L data received from the output of the error detection and correction decoder 31, using an exclusive OR to output audio narrow band DB data not containing second D2L data. If the error detection and correction decoder 31 outputs random data, the mixer 35 multiplies the lower two bits of the audio data with random numbers to output audio data DB that does not contain second data D2L. The disc recognition circuit 27 is formed by a system controller that, when the optical disc 21 is installed, performs a search operation by scanning the inner and outer edges of the optical disc 21 at high speed to obtain information related to the number of music numbers or to the playing time recorded on the optical disc 21, for Demonstration of the received information on the provided display. The system controller also receives disc ID identification data from the optical disk 21 to check whether the optical disk 21 is a conventional compact disc or an optical disc according to the present invention in accordance with the disc ID identification data. The disc recognition circuit 27 controls contact switching of the selective circuits 25, 36 based on the recognition results. If, as a result of checking the reproduced data recorded in the input zone of the optical disk 21, the disk recognition circuit 27 confirms that the installed optical disk 21 is an optical disk according to the present invention, then the disk recognition circuit 27 processes the playback RF signal received from the output of the circuit 24, using the circuit 28 of the recognition signal level of the RF playback to reproduce audio data DAEx with a wide frequency range, containing the first data D2U and second data D2L.

If the optical disk 21 is a conventional compact disk, then the selective circuit 36 selectively outputs the audio data D6 received from the output of the CIRC decoder 29 to the digital-to-analog conversion circuit 37. If, on the contrary, the optical disk 21 is an optical disk having not only the first D2U data, but also the second D2L data recorded thereon, according to the present invention, then the selective circuit 36 selectively outputs audio data with a wide frequency range synthesized from the first data D2U and second data D2L received from the output of the multiplexer 33.

The digital-to-analog conversion circuit 37 converts the audio data received from the output of the selective circuit 36 from digital to analog form for supplying the output of audio data SA in the form of analog signals. Thus, if the optical disk 21 is a conventional compact disc, then the reproducing apparatus 20 selectively processes the audio data D6 received from the output of the CIRC decoder 29 to reproduce sound with a quality equivalent to the usual 16-bit sound quality indicated in table 1 as CD audio quality, while if the disk is an optical disk 21 according to the invention, the reproducing apparatus 20 selectively processes the DAEx wide frequency range audio data equivalent to 18 bits specified table 1 as the quality of the ExCD sound synthesized from the first data D2U and second data D2L obtained from the output of the multiplexer 33.

In a conventional reproducing apparatus for reproducing a conventional CD, audio data D6 obtained from the output of the CIRC decoder 29 is output without passing through mixer 35, so that the conventional reproducing apparatus reproduces the audio data recorded on a conventional CD and to an optical disc according to the invention with CD sound quality comparable to that of a conventional CD.

Interface 38 (I / F) forms an input / output circuit for transmitting / receiving variable data using an external device for outputting audio data to a personal computer in accordance with the SCMS format (sequential copy control system) or for transmitting / receiving variable data in accordance with sound data.

Similarly to the disk recognition circuit 27, the system controller of the reproducing device 20 according to the invention forms an external device recognition unit 39 and performs a predetermined authorization process of the external device via the interface 38. In this authorization process, the external device recognition unit 39 sends predetermined data to the external device to which should the external device respond, checks if the computer connected to interface 38 is a registered device that prohibits the second copier Using audio data recorded on optical disc 21 to protect copyright.

A device that protects copyright is such a device that has the function of prohibiting the so-called second copy by re-copying the entire copy once already obtained from data containing audio data recorded on an optical disc. If the external device is a computer and you need to make an optical disk that copies the audio data received from the output of the reproducing device 20, then this personal computer is a copyright protection device if it has the function of correctly setting the IC identification data. This computer is indicated in Table 1 as prohibiting a second copy of the PC as opposed to a conventional personal computer.

The selective circuit 40 operates on the basis of the recognition results of the external device recognition unit 39 so that if the external device is a registered device prohibiting the second copying of audio data recorded on the optical disc, then the selective circuit 40 selectively outputs audio data received from the output of the selective circuit 36, and vice versa, if the external device is a device that does not have the function of prohibiting copying of audio data recorded on an optical disc, select Selective circuit 40 selectively outputs DB audio data obtained from mixer 35. Thus, if the external device is a registered device prohibiting second copying, and optical disc 21 is a regular CD, then selective circuit 40 outputs audio data with sound quality equivalent to 16 bits, and if the optical disk 21 is a conventional compact disc or optical disc according to this invention, only data corresponding to the first data can be output m D2U having sound quality equivalent to 16 bits. With a conventional CD, audio data can be output with sound quality equivalent to 16 bits, as in a conventional device. In this case, the sound quality is indicated in table 1 as the quality of the FM sound.

At the same time, if the external device is a registered device that prohibits duplication, the reproducing device 20, according to this invention, switches the contacts of the selective circuit 36 to the connected position with the selective circuit 40 to output 16-bit audio data equivalent to audio data recorded on a regular CD.

(3) A data recording operation and an audio data reproducing operation by a recording device

For the manufacture of an optical disc according to this invention, using the recording device 1 shown in FIG. 1, the audio signals SA supplied to the recording device 1 are converted by an analog-to-digital conversion circuit 10 into 18-bit audio data DA, which is a bit-wise block 11 the processing is divided into the first D2U data from the upper 16 bits and the second D2L data from the lower 2 bits. An error correction code is added to the first D2U data of the 16 high-order bits using the data processing circuit 12 in the same way as in the manufacture of a conventional CD. The data obtained are alternated and subjected to EFM modulation. The data of the 14-channel bits obtained using the data subjected to EFM modulation, as described above, is connected using the connecting bits of 3 channel bits to form the data D3 of the output channel. The first D2U data from the 16 high-order bits is recorded on the optical disc in the form of alternating grooves P ₁ and pads R ₁ using the laser beam L, the output channel turned on and off by the D3 data for sequential exposure of the master disk 2 with light.

The first D2U data of the 16 high-order bits are written to the optical disc in the form of data reproduced by a device designed exclusively for playing a regular CD.

On the other hand, the second D2L data from the lower 2 bits is collected into 4-bit modules as audio data with a frequency range higher than the frequency range of the first D2U data to form a block consisting of six data (24 bits). 4-bit parity is added to each block. Each block consisting of 6 data (24 bits) and one parity (4 bits) are interleaved and 4-bit parity is added to the interleaved data.

The D2L audio data from the lower 2 bits, to which, as indicated above, an error correction code has been added, are alternated and essentially converted to serial D4 data. Then the serial data is distributed among the notches, so that each bit of the serial data D4 corresponds to one notch. The light power of the laser beam L is switched depending on the logical level of the serial data during exposure of the master disk 2 with light. Thus, the second D2L data, which extends the reproduction frequency range by two least significant bits, is sequentially recorded on the optical disc by increasing the width W of the recesses, as shown in FIGS. 2A-2D.

When the master disk 2 is thus exposed to light, the input zone is formed from the TOC data (table of contents). Using the identification data of the disc ID included in the TOC data, it is possible to recognize whether the optical disc is an optical disc in which the 18-bit audio data is divided into the upper 16 bits and the lower 2 bits, or a regular CD. Similarly, using the identification data of the IC copy, it is possible to determine whether the optical disc is the original optical disc or the optical disc on which the once copied audio data is located.

With the optical disk thus prepared, the playback signals read by the optical head 23 are amplified by the circuit 24 and demodulated by the EFM demodulation circuit 26 to create playback data, which is then decoded and corrected to reproduce the 16-bit audio data D6.

In the reproducing apparatus for reproducing a conventional CD, the audio data D6 obtained from the output of the CIRC decoder 29 is output to the external device in the form of converted analog signals. Thus, 16-bit audio data is output directly in the form of converted analog signals, if a conventional CD or an optical disc, on which the first D2U data and the second data are recorded, are installed in the playback device designed to play ordinary CDs D2L according to this invention.

An optical disc according to the present invention can also be reproduced using a reproducing apparatus solely for reproducing a conventional compact disc, which ensures compatibility with a disc reproducing apparatus exclusively intended for reproducing a conventional compact disc.

In the reproducing apparatus 20 capable of reproducing an optical disc according to the present invention, disc ID identification data is detected in the TOC data in the input zone. Based on the identification data of the disc ID, it is possible to recognize whether the mounted optical disc 21 is a conventional compact disc or an optical disc according to the present invention.

If a conventional CD-ROM is installed, then the 16-bit audio data D6 obtained from the output of the CIRC decoder 29 is supplied through the selective circuit 36 to the input of the digital-to-analog conversion circuit 37, where the audio data is converted into analog audio signals SA. Thus, if a conventional CD is inserted in the reproducing apparatus 20, then the audio signals are reproduced as usual with a sound quality equivalent to 16 bits.

If an optical disc is installed having the first data D2U and the second data D2L recorded thereon, then the reproducing RF signal through the selective circuit 25 is supplied to the input of the RF signal level recognition circuit 28 where reproduction data from a series of notches and pads are detected. The playback data is processed similarly to the processing of the playback data of a conventional CD to obtain the 16-bit first D2U data at the output of the CIRC decoder 29.

In the circuit 28 for recognizing the level of the reproducing RF signal, the upper or lower magnitude of the reproducing RF signal corresponding to the midpoint of the notch is recognized. Based on the recognition of the signal level, changes in the length of the notch are corrected using the upper or lower value, and the result of recognition of the signal level DP, which is represented by changes in the signal level depending on the width of the notch, is determined. The DP signal strength recognition result is divided into two levels and playback data is extracted from the second D2L data represented by the two least significant bits, as shown in FIGS. 4A and 4B. This reproduction data is error corrected in the error detection and correction decoder 31, interleaving is removed, and second D2L data from the two least significant bits is reproduced. In the multiplexer 33, the second low-order D2L data of the two least significant bits is added to the first D2U data of the high-order 16 bits output by the CIRC decoder 29 to create 18-bit DAEx audio data with a wide frequency range. On the other hand, the second D2L data is multiplied or XOR operations in the mixer 35 with the two least significant bits of the high 16-bit first D2U data to create 16-bit audio DB data with a frequency range that does not contain a high frequency range.

In the reproducing apparatus 20 of the present invention, DAEx audio data with a wide frequency range comprising a high frequency range is output as analog signals using a digital-to-analog conversion circuit 37 for reproducing DAEx audio signals providing high-quality audio reproduction, equivalent to 18-bit signals.

If the audio data obtained from a conventional CD-ROM, or the audio data obtained from an optical disc according to this invention, is to be supplied to an external device from the output of the reproducing device 20, then the authorization process of the external device is performed using the interface 38 to verify whether or not, an external device with a device that violates the SCMS code, for example, with a regular personal computer. This decision confirms whether or not the external device connected to the reproducing device 20 is a registered device prohibiting the second copying. If the external device is a registered device prohibiting the second copying, then wide-frequency audio data containing the first D2U data and the second D2L data from the output of the multiplexer 33 are supplied to the external device via the selective circuit 36, the selective circuit 40 and the interface 38. If installed Since the optical disk is a regular compact disk, the 16-bit audio data from the output of the CIRC decoder 29 is supplied to the external device via the selective circuit 36, the selective circuit 40 and the interface 38. manner, audio data with a broad frequency range containing the high frequency range are fed into the external device. If this external device is a registered device prohibiting second copying, then audio data copied once cannot be copied again to prevent copyright infringement due to repeated copying.

If the external device connected to the reproducing device is a device that does not have the function of prohibiting repeated copying, the sound data DB, the sound quality of which deteriorates several times due to repeated copying, is supplied from the output of the mixer 35 to the external device via the selective circuit 40 and the interface 38, so if there is the possibility of multiple copying of digital data, then the output receives audio data, the sound quality of which is impaired, and therefore cannot be used sya advantage copying of digital signals whose quality does not deteriorate as a result of repeated copying.

If the external device connected to the reproducing device 20 is a device that has the function of prohibiting re-copying, and the identification data IC of the copy is correct, then audio data with a wide frequency range containing a high frequency range including the first D2U data is prepared and output. and second D2L data, so that if audio data is reproduced by a device other than the reproducing device according to this invention, it is possible to prevent s second copy of the audio data, for example, by SCMS system based on the identification data IC copy for copyright protection.

In the optical disk 21 according to the present invention, in which a plurality of recesses formed on the basis of the first D2U data are deformed in width in a direction perpendicular to the track direction on the basis of the second D2L data and recorded as the second D2L data. Thus, if a misconception is intentionally created that the external device connected to the reproducing device 21 is a registered device having a copy inhibit function, so that 18-bit audio data with a wide frequency range comprising a high frequency range including the first D2U data and the second D2L data, it becomes difficult to copy the complete audio data, including the first D2U data and the second D2L data, in order to be able to prevent Nia copy of the audio data, which provides the desired playback a wide frequency range. As a result, it is forbidden to duplicate audio data providing reproduction with high quality to protect the copyright of the owner.

Using the optical disc according to this invention, the DA audio data from 18 bits is divided into the first D2U data from 16 high-order bits and the second D2L data from 2 low-order bits, the first D2U data from 16 bits being recorded by repeating the notches P ₁ and pads R ₁ between the grooves P ₁ , while the second data D2L is recorded using the two least significant bits by changing the width of the groove, due to which it is possible to create high-quality audio signals that reproduce a wide frequency range, with holding a range of high frequencies, as well as playback using a playback device designed exclusively for playing a regular CD. In addition to this, it is possible to prevent duplication of the DAEx audio data, providing playback with high sound quality.

In addition, by recognizing whether the external device connected to the reproducing device 20 has a second copy inhibit function, and by outputting audio data containing only the first D2U data from the upper 16 bits, or audio data containing as the first the D2U data and the second D2L data, it is possible to prevent the reproduction of DAEx audio data that reproduces high-quality audio signals.

In addition, if when reproducing the optical disc according to the present invention, using the reproducing apparatus, sound reproduction is obtained due to reproduction of the first D2U data with the second D2L data, deteriorated in sound quality, it is possible to similarly protect the copyright of the owner when copying DAEx sound data which provide sound reproduction with the desired high level of quality.

(4) Second Embodiment

In this embodiment, as in the previous embodiment, the 18-bit audio data is divided into the first D2U data of the 16 high-order bits and the second D2L data of the 2 lower-order bits, the first D2U data of the upper 16 bits being processed identically to the normal sound data CD and are recorded using the pads R ₁ between the plurality of pits P ₁ , while the second data D2L from the lower 2 bits is recorded by changing the length P _{L of the} pit P ₁ in the track direction with respect to the normal length.

In this embodiment, the recording apparatus 1 and the reproducing apparatus 20 described above can be used with the exception of writing the second D2L data to the optical disc by changing the width W in the direction perpendicular to the track direction. Thus, the recording device 1 and the reproducing device 20 are explained with reference to figure 1, respectively, figure 3.

In the recording apparatus 1 used in this case, the data processing circuit 12 adds an error correction code to the second low-order data D2L and interleaves the resulting data to form a series of serial data, as in the first embodiment described above. The data processing circuit 12 generates and outputs the notch length control data D4, in which the corresponding bits of the serial data are sequentially assigned a time period from the point in time when the logical level of the channel data D3 switches to the logical level corresponding to the notch, and until the time of switching to the logical level corresponding to the site.

The channel data D3 from the output of the data processing circuit 12 is supplied to the control circuit 13, which creates a control signal S3, the level of which is intermittently increased in accordance with the logical level of the channel data D3. At this time, the control circuit 13 drives the monovibrator using the notch length control data D4 and generates the control signal S3 using the resulting clock signal and the channel data D3, so that the notch length varies depending on the logical level of the notch length control data D4, the period is significantly less than 1/2 the data period D3 of the channel, as shown in figa-5D, used as a unit. The change in the length of the notch is chosen so as to ensure the processing of the RF playback signal with a sufficient phase tolerance even with a reproducing device designed solely for playing a conventional CD. In this embodiment, the change in the length of the recess is selected so that the length of the recess is changed by ± 0.1 μm depending on the data D4 control the length of the recess, so that the length of the recess increases or decreases at the boundaries of the bit cell relative to the reference length.

Due to a small change in the length P _{L1 of the} recorded recess in the track direction based on the second data D2L relative to the normal length P _{L, the} second data D2L with a higher frequency range than the frequency range of the first data D2U is recorded on the optical disc.

When installing in the reproducing apparatus and reproducing the optical disc 21 having the second data D2L recorded thereon with a small change in the length P _l in the direction of the track relative to the normal length P _L , the playback RF signal is recognized in two levels using a predetermined threshold value, wherein time corresponding to P ₁ in which the signal level drops, or a period of time corresponding to P ₁ in which the signal level rises, varies depending on the logical level of data D4 is governed the length of the notch. Conversely, when reproducing the signal level or logical level of a two-level signal obtained by successively sampling the rising or falling edges of a two-level signal, the signal level or logical level is changed over a period of time corresponding to the trailing edge of the notch P ₁ relative to the channel clock pulses as reference signals, in depending on the logical level of the data D4 control the length of the notch. The length of the notch P ₁ in the direction of the track on the optical disk 21 is slightly changed relative to the normal length by measuring the time of the two-level signal or the logical level of the playback signal with a clock signal as a reference signal for reproducing the second data D2L.

Based on this recognition principle, the RF playback signal level recognition circuit 28 and the two-level demodulation circuit 30 recognize the reproducing RF signal in two levels using the clock pulses of the reproducing RF signal channel, as in the EFM demodulation circuit in a reproducing apparatus designed solely for reproducing a conventional compact a disk, as reference signals for creating playback data, while simultaneously extracting second D2L data from the playback RF signal, providing reproducing a wide frequency range containing a frequency range higher than the RF reproduction signal. Namely, the level of the recognition signal RF playback RF binary encodes the signal RF playback at a given threshold value to create two-level signals and provides the measurement results of the time of two-level signals in the circuit 30 two-level demodulation. As an alternative solution, the RF playback signal level recognition circuit 28 recognizes the RF playback signal level or the logical level of the two-level signals using the channel clock signal as the reference signal and outputs the DP level recognition result or the logical level DP recognition result in the period time corresponding to the trailing edge of the recess.

The two-level demodulation circuit 30 checks the output of the playback RF signal level recognition circuit 28 to detect playback data of the second high frequency data D2L.

Using the optical disk 21 according to this invention, it is possible to achieve results similar to the results of the first embodiment described above, if, by slightly changing the length in the direction of the notch track recorded on the basis of the first D2U data with respect to the normal length, record the second D2L data with a range frequencies higher than the frequency range of the first D2U data. By changing the length of the recesses in the direction of the track by increasing / decreasing the length to a point corresponding to the boundary of the bit cell, the effect of jitter during playback can be reduced to an almost sufficient level.

(5) Third Embodiment

Using the optical disk 21, according to this embodiment of the invention, the 18-bit audio data is divided into the first D2U data of the 16 high-order bits and the second D2L data of the 2 lower-order bits, the first D2U data of the upper 16 bits is processed as in a conventional CD and are recorded as a chain of a plurality of recesses P ₁ in the same way as in the embodiment described above, while the second data D2L from the 2 least significant bits are recorded by changing the depth P _{D1 of the} recess P ₁ with respect to the normal depth P _D.

In the recording device 1 used to prepare the optical disk 21, the photoresist is selected so that the degree of exposure to light changes mainly in the direction of the depth of the recess due to a change in the light power of the laser beam L.

By recording the second D2L data in the form of a change in the depth of the recess formed on the optical disk 21 relative to the normal depth, the upper or lower signal value changes depending on the second D2L data when reproducing the data recorded on the optical disk 21, as in the first embodiment described above. In this embodiment, the second data D2L recorded as a change in the depth of the notch from the normal depth P _D to the depth P _D1 by ± 0.01 μm, so that even with such a change in the upper or lower magnitude of the signal, the audio data corresponding to the first data D2U from 16 high-order bits will be reproduced with sufficient amplitude tolerance in the reproducing device used exclusively for playing a regular CD.

If the second data D2L is recorded as a change in the depth of the recess P ₁ relative to the normal depth P _D , then the playback signals obtained by reproducing the optical disc 21 are changed in upper or lower value in accordance with the second data D2L, as in the first embodiment, that it is possible to selectively process DAEx audio data synthesized from the first D2U data and the second D2L data output from the multiplexer 33 of the reproducing apparatus 20 according to the present invention shown in FIG. 3 for IMPLEMENT with high quality sound (sound quality ExCD), with a frequency range equivalent to 18 digits.

(6) Fourth Embodiment

In this embodiment of the optical disc, similarly to the first embodiment described above, the first D2U data, consisting of 16 high-order bits of the 18-bit audio data, is processed in the same way as with a conventional CD, and recorded as a plurality of pits P ₁ , while the second data D2L consisting of 2 least significant bits is recorded by changing the width W _{3 of the} recess perpendicular to the length of the recess P ₁ in the direction of the track. By varying the width of the recess in accordance with the second data D2L, a recess with a length greater than a predetermined length is selectively used, for example a recess that is not shorter than 5T, and 1-bit data is assigned to the front and rear halves of the recess P ₁ relative to the center P ₀ to change the width W ₄ recesses as shown in FIGS. 7A and 7B.

The optical disk according to this embodiment is similar to the optical disk of the first embodiment except for the difference in modulation time of the width W _{3 of the} recess. Thus, the optical disc according to this embodiment can be manufactured using the recording apparatus 1 shown in FIG. 1, while the optical disc can be reproduced using the reproducing apparatus 20 shown in FIG. 3.

In the recorder 1, an error correction code is added to the second low-order 2-bit data D2L, and the resulting data is alternated to form a series of serial data using the data processing circuit 12, as in the first embodiment described above. The data processing circuit 12 controls the logical level of the continuous notch P ₁ in the output channel data D3 to detect a time corresponding to the notch P ₁ having a length of at least a predetermined length, for example 5T or more. This data processing circuit 12 assigns 1-bit data to the front and rear halves of the recess in the direction of a track having a length of at least a predetermined length to create and provide light output control data D4.

In the optical disk reproducing apparatus 20 shown in FIG. 3, the reproducing RF signal is recognized in two levels by a channel clock signal reconstructed by the reproducing RF signal as a reference signal by signal processing similar to that performed by the EFM- circuit demodulations in a reproducing apparatus solely for reproducing a conventional CD for generating reproducing data supplied to the EFM demodulation circuit 26.

The playback RF signal level recognition circuit 28 detects in the playback data a time of decreasing or increasing the signal level for more than a predetermined period for detecting a notch P ₁ in which the second data D2L is recorded with a frequency range higher than the frequency range of the first data D2U. Then, the playback signal RF level recognition circuit 28 detects the level of the playback RF signal for a predetermined time in the front and rear halves of the recess in the track direction with respect to the center of the recess length P ₁ . The reproduction RF signal level recognition circuit 28 outputs the result of the DP reproduction signal DP level detection to the input of the next two-level demodulation circuit 30, which checks the results of the reproduction RF signal level recognition circuit 28 to detect reproduction data of the second high frequency range data D2L.

Using the optical disc, according to this embodiment, a result similar to that of the first embodiment described above is achieved if the second data D2L, consisting of the lower 2 bits, is recorded by changing the width W _{4 of the} recess P ₁ with a length of at least a given length, front and the back halves of which are assigned one category.

(7) Fifth Embodiment

In this embodiment of the optical disc, similarly to the first embodiment described above, the first D2U data, consisting of 16 high-order bits of the 18-bit audio data, is processed in the same way as with a conventional CD, and recorded as a plurality of pits P ₁ , while the second least significant bit data D2L is recorded by changing the depth P _{D1 of the} recess P ₁ recorded on the optical disc relative to its normal depth P _D. As a recess P ₁ , the normal depth of which is changed in accordance with the second data D2L, a recess with a length not less than a predetermined length, for example 5T or more, is selected, and each bit depth is assigned 1 bit to each change in depth in the front and rear halves of the recess P ₁ relative to the center.

An optical disk according to this embodiment can be manufactured using the recording device 1 shown in FIG. 1 and reproduced using the reproducing device 20 shown in FIG. 3.

To record the second data D2L on an optical disc according to this embodiment, using the recording device shown in FIG. 1, the light power of the laser beam L is controlled, while the depth P _{D1 of the} recess P _{1 is} changed relative to the normal depth by selective exposure light in the depth direction, which is provided by the choice of photoresist.

When reproducing an optical disc using the reproducing apparatus shown in FIG. 3, DAEx audio data synthesized from the first D2U data and the second D2L data can be selectively processed to provide high-quality sound reproduction (ExCD audio quality) with a frequency range equivalent to 18 discharges.

(8) Sixth Embodiment

In this embodiment of the optical disc, the first D2U data, consisting of 16 high-order bits of 18-bit audio data, is processed as in the case of a conventional CD, and recorded as a plurality of pits P ₁ , while the second data D2L, consisting of the lower 2 bits, write by changing the width W of the recess P ₁ in the direction perpendicular to the direction of the track. As a notch P ₁ , the width of which is changed in accordance with the second data D2L, a notch P ₁ with a length of at least a given length is used, for example, a notch P ₁ with a length of at least 5 T or more, and the second data D2L is recorded by changing the width from the front to the rear half of the recess P ₁ relative to the center in the direction of the track.

As shown in FIGS. 8A and 8B, the notches P ₁ are formed so that if the logic level is logical “1”, then the width W _{6 of the} notch P _{1 of the} second data D2L increases from the midpoint of the length of the notch P ₁ in the track direction, and vice versa if the logic level is logical “0”, then the width W _{5 of the} recess P _{1 of the} second data D2L decreases from the midpoint of the length of the recess P ₁ in the direction of the track.

In the recording device 1 for recording data on an optical disc according to this embodiment, an error correction code is added to the second D2L data consisting of 2 lower-order bits and the resulting data is alternated to form a chain of serial data. In addition, the data processing circuit 12 controls the logical level of successive bits in the output channel data D3 to detect a time corresponding to a notch P1 having a length of at least a given length, for example at least 5T. This data processing circuit 12 assigns 1-bit data to each front and rear portions of the recess P ₁ in the direction of a track having a length of at least a predetermined length to create and provide light output control data D4.

In the optical disk reproducing apparatus 20 shown in FIG. 3, the RF signal level recognition circuit 28 performs signal processing similar to that performed by the EFM demodulation circuit in the reproducing apparatus solely for reproducing a conventional CD for performing two-level recognizing the reproducing RF signal by the channel clock received from the reproducing RF signal as a reference signal to form reproducing OF DATA supplied to the 26 EFM-demodulation circuit.

The signal level recognition circuit 28 of the reproducing RF signal determines in the reproduction data the time during which the signal level increases or decreases in a period of time longer than a predetermined period to detect a notch P ₁ in which the second data D2L is recorded with a frequency range higher than the frequency range of the first data D2U, to determine the level of the RF playback signal at predetermined times before and after the center of the length of the recess P ₁ in the direction of the track. The reproduction RF signal level recognition circuit 28 outputs the result of the DP reproduction signal DP level detection to the input of the next two-level demodulation circuit 30, which checks the results of the reproduction RF signal level circuit 28 for detecting reproduction data of the second high-frequency range data D2L.

Using the optical disk according to this embodiment, a result similar to that of the first embodiment described above is achieved if the second D2L data, consisting of the lower 2 bits, is recorded by changing the width W ₅ , W _{6 of the} recesses distributed on the front and rear halves of the recess P ₁ in the direction of the track with a length of at least a given length.

(9) Seventh Embodiment

In this optical disc embodiment, similar to the first embodiment described above, the first D2U data consisting of 16 high-order bits of the 18-bit audio data is processed in the same way as with a conventional CD, while the second D2L data consisting of the 2 lower-order bits are recorded by changing the depth P _{D of the} recess P ₁ recorded on the optical disc. As a notch P ₁ , the depth of which is changed in accordance with the second D2L data, a notch having a length of at least a predetermined length, for example a notch with a length of at least 5 T, is used, and the second D2L data is recorded by changing the depth from the front to the rear halves of the recess relative to the center in the direction of the track. The recesses of the second data D2L are sequentially formed so that if the logical level is “1”, then the depth P _{D1 of the} recess P ₁ becomes larger from the middle of the length of the recess in the track direction, and vice versa, if the logical level is “0”, then the depth P _{D1 of the} recess P ₁ becomes smaller from the middle of the length of the recess P ₁ in the direction of the track, as shown in Fig.9.

An optical disk according to this embodiment can be manufactured using the recording device 1 shown in FIG. 1 and reproduced using the reproducing device 20 shown in FIG. 3.

To record the second data D2L on an optical disc according to this embodiment, using the recording device shown in FIG. 1, the light power of the laser beam L is controlled, while the depth P _{D1 of the} recess P _{1 is} changed relative to the normal depth by selective exposure light, which is provided by the choice of photoresist.

When reproducing an optical disc using the reproducing apparatus shown in FIG. 3, DAEx audio data synthesized from the first D2U data and the second D2L data can be selectively processed to provide high-quality sound reproduction (ExCD audio quality) with a frequency range equivalent to 18 discharges.

(10) Eighth Embodiment

In this embodiment of the optical disc, the first D2U data, consisting of 16 high-order bits of 18-bit audio data, is processed in the same way as with a conventional CD, and recorded in the form of a chain of many notches P ₁ , while the second D2L data is recorded by changing the length of the recess of the track formed from the plurality of recesses P ₁ recorded on the optical disc and the sites bounded by these recesses P ₁ relative to their normal length in the direction of the track from the left and right sides of the track center T ₀ , as shown on figa and 10B.

The recess, the length of which is changed based on the second D2L data, is a recess whose length is not less than a given length, for example, a recess no shorter than 5T. The second D2L data is recorded by changing the width of the recess from one half to the other half of the recess along the track relative to its center. Namely, the recess P ₁ , in which the second data D2L is recorded, has a length that can be changed along the track on the left and right sides of the recess P ₁ , i.e. from the inner and outer edges of the optical disc.

The recesses of the second data D2L are formed sequentially so that if the logical level is “1”, then the inner side of the edge of the recess is longer in the track direction than the outer side of the edge, as shown in FIG. 10A, and vice versa, if the logical level is “0” , then the outer side of the recess edge is longer in the track direction than the inner side of the edge, as shown in FIG. 10B.

In the recording device for recording the second D2L data, together with the first D2U data on the optical disk, the optical disk is irradiated with two laser beams L, these two laser beams L being turned on and off by the respective light modulators and two laser beams emitted by the light modulators are incident on the master disk 2 and are reduced by the objective lens 9 so that the inner part of the edge and the outer part of the edge of the recess P _{1 are} exposed to light in the direction of the track.

A recording device configured to record on an optical disc according to this embodiment, not only the first D2U data, but also the second D2L data, adds an error correction code to the second D2L data and interleaves the resulting data to form a chain of serial data. The recording device also turns two light modulators on and off using the output channel data D3 formed from the first 16 high-order bits D2U and a series of serial data.

A reproducing apparatus configured to reproduce an optical disk on which not only the first D2U data, but also the second D2L data is recorded using a recording device, illuminates the optical disk with a light beam and receives a return light beam reflected from the optical disk using a tuned photodetector, provided on the optical pickup head.

As shown in FIG. 11, the photo detector 82 is divided in the direction of the track in accordance with the direction of the track on the optical disk and in the direction perpendicular to the direction of the track, with the formation of four parts AD photodetector. The return light beam reflected from the optical disk forms a light spot 88 around the point of intersection of the lines separating the four parts of the AD photodetector serving as a center.

Photo detector 82 provides SA-SD output signals detected by the four parts A-D of the photo detector. A reproducing apparatus having an optical pickup head including a photodetector 82 and configured to reproduce an optical disc according to this invention processes the SA-SD output signals generated by the four parts of the A-D photodetector, converting the current to voltage and performs processing operations to create an RF playback signal, etc. This reproducing apparatus summarizes the SA-SD output signals provided by the four parts A-D of the photodetector using the first addition circuit 83 to generate the reproducing RF signal and processes the reproducing RF signal in the same way as a conventional reproducing apparatus used solely for reproducing a CD, to reproduce the first data D2U, consisting of 16 high-order bits recorded in the form of a chain of many recesses.

The reproducing apparatus according to the present invention includes, in addition to the first addition scheme, a second and third addition scheme 84, 85, as shown in FIG. 11. These second and third addition circuits 84, 85 summarize the output signals SA and SB issued by the first and second parts SA, SB of the photodetector, and the output signals SC and SD issued by the third and fourth parts of SC, 3D photodetector to form the results of addition SA + SB and SC + SD, which are then subtracted in the subtraction circuit 86. Due to such signal processing, a reproducing device for reproducing an optical disc according to this invention creates a reproduction RFD signal (SA + SB-SC-SD), the level of which varies depending on the shape of the notch P ₁ , the shape of the side of the inner edge of which changes, and from the shape of the recess P ₁ , the shape of the side of the outer edge of which varies, among the recesses, the length of which is changed in the direction of the track on the left and right sides of the track based on the second data D2L, consisting of 2 least significant bits. If the level of the playback RFD signal changes more than a predetermined value, then the playback RFD signal is recognized in two levels at a point in time in which the playback RFD signal is formed by the recess portion P ₁ with different shapes on the sides of the inner and outer edges, and the signal divided into two levels is processed for creating playback data derived from the second D2L data and having a higher frequency range than the frequency range of the first D2U data.

In this optical disc, DAEx audio data synthesized from the first D2U data and the second D2L data is selectively processed to provide high quality sound reproduction with a frequency range equivalent to 18 bits.

(11) Ninth Embodiment

In this optical disk, the first D2U data, consisting of 16 high-order bits of 18-bit audio data, is processed in the same way as in a conventional compact disk to form a chain of a plurality of pits P ₁ that are recorded. The second data D2L is recorded by changing the lengths of the plurality of recesses P ₁ and pads R ₁ recorded on the optical disc in the direction of the left and right tracks, relative to the center T _{0 of the} track, relative to the normal length based on the second data D2L. The pads R _{1 are} formed between the recesses P ₁ recorded on the optical disc. In this case, the lengths of the inner and outer edges of the recesses P ₁ and the pads R ₁ in the direction of the track are changed in a special channel bit. In this example, a special channel bit is located in the central bit B _{C1 of the} connecting bits B _C to change the shape of the notch P ₁ and the shape of the pad R ₁ using the connecting bits on the inner and outer sides of the edge of the notch on the left and right sides of the center T _{0 of the} track. The 14 channel bits between the connecting bits In _C , which are allocated for the first D2U data consisting of 16 high-order bits, are not affected by the low-order 2 bits of the second D2L data, and they can be reproduced with a phase tolerance and amplitude tolerance comparable to tolerances in a regular CD.

To record the first D2U data and the second D2L data onto an optical disc, the recording device 1 turns on and off three laser beams obtained by dividing the laser beam L at the output of the recording laser 5 shown in FIG. 1 using the corresponding light modulators 6, and reduces three laser beams obtained at the outputs of the light modulator 6 on the master disk 2 using the lens 9 of the lens. These three light beams are located in the center of each recess in the center T _{0 of the} track and on the inner and outer sides of the optical disk on the left and right sides of the center T _{0 of the} track.

The recording device 1 also turns the laser beam on and off in the center of the recess using the output channel data D3 created by the first 16 high-order D2U data to record the first 16 high-order D2U data by repeating the chains of the plurality of recesses P ₁ .

The recorder also adds an error correction code to the second D2L data and alternates the resulting data to form a series of serial data, and outputs a laser beam directed to the internal or external sides of the notch P ₁ depending on the logical level of the serial data chain during the central bit B _C1 to D3 output channel data, wherein if the recess P ₁ relating to the first data D2U, formed on both sides of the coupling bits in _C, as shown in Figure 12A, the master disc 2 is exposed vetom so that, depending on the logic level of the first data D2U groove width W ₂₁ P ₁ varies appreciably towards the inner and outer sides in the part relating to the central B _C1 bit coupling bits in _C, as shown in Figure 12B-1 and 12B -2.

If the notch P ₁ extends to the central bit B _{C1 of the} connecting bits B _C1 , then the master disk 2 is exposed to light so that the width W _{21 of the} notch P ₁ increases in the direction of the inner or outer sides at the rear end of the notch P ₁ corresponding to the central bit B _{C1 of the} connecting bits B _C relative to the direction of the track, depending on the logical level of the second data D2L, as shown in figs-1 and 12C-2. If the notch P ₁ starts from the center B _{C1 of the} connecting bits B _C , then the master disk 2 is exposed to light so that the width W _{21 of the} notch P ₁ increases in the direction of the inner or outer sides at the front end of the notch P ₁ corresponding to the center bit B _{C of the} connecting bits B _C relative to the direction of the track, depending on the logic level of the second D2L data, as shown in FIGS. 12D-1 and 12D-2.

If the central bit B _{C1 of the} connecting bits B _{c is} located on the site R, then the master disk 2 is exposed to light so that depending on the logical level of the second data D2L form a recess P _C1 having a width corresponding to the increased width W _{21 of the} recess P ₁ , as shown in FIGS. 12E-1 and 12E-2.

A reproducing apparatus configured to reproduce an optical disc having first D2U data and second D2L data recorded thereon, as described above, performs selective two-level recognition of the reproducing RFD signal obtained using the photo detector 82 shown in FIG. 11 during light scanning the beam emitted by the optical pickup head, the central bit B _{C1 of the} connecting bits B _C , to create playback data with a frequency range higher than the frequency range zones of the first D2U data obtained from the second D2L data consisting of 2 least significant bits.

Using this optical disc, it is also possible to provide high-quality sound reproduction (ExCD sound quality) with a wide frequency range equivalent to 18 bits by selectively processing DAEx audio data synthesized from the first D2U data and the second D2L data.

In addition, when installing special channel bits in the connecting bits B _C and placing them as the central bit B _{C1 of the} connecting bits B _C , into 14 channel bits between the connecting bits B _C , in which the first D2U data is distributed, consisting of 16 high-order bits 18-bit audio data, the lower 2 bits of the second D2L data are not affected, and they can be reproduced with a phase tolerance and amplitude tolerance comparable to the tolerances for a regular CD.

(12) Tenth Embodiment

Using the optical disc according to this embodiment, just as using the optical disc according to the corresponding embodiments described above, the first D2U data of the 16 high-order bits of the 18-bit audio data is processed, as in the case of a conventional compact disc, and recorded in in the form of many recesses. On the other hand, the second least significant bit data D2L is recorded due to the displacement of the front and rear parts of the recess P ₁ , relative to the track direction, in a direction perpendicular to the track direction from the track center T ₀ . If in this embodiment of the optical disk the logical level of the second data D2L is logical "0", then the front side of the recess P ₁ is shifted in the direction of the outer edge of the optical disk perpendicular to the track direction from the center T _{of the} track with the center of the recess in the longitudinal direction of the recess as a boundary, while the rear end of the recess P ₁ is shifted toward the inner edge of the optical disc from the center T _{0 of the} track perpendicular to the track direction, as shown in FIG. 13A. On the other hand, if the logical level of the second data D2L is logical "1", then the front side of the notch P ₁ is shifted in the direction of the inner edge of the optical disk perpendicular to the track direction from the center T _{0 of the} track with the center of the notch in the longitudinal direction of the notch as a boundary, then while the back of the recess P ₁ is shifted towards the outer edge of the optical disc from the center T _{of the} track perpendicular to the direction of the track.

To manufacture an optical disk on which the front and rear parts of the recess P ₁ formed on the basis of the first data D2U are displaced in the direction perpendicular to the direction of the track from the center T _{0 of the} track, the radiation direction of the laser beam L is deflected using a light deflector 8 located on the optical path of the laser beam L at the output of the light modulator 6 of the recording device 1 shown in FIG. 1, at a time when the notch P ₁ is shifted using the second low-order data D2L. The light modulator may be an electro-acoustic optical element.

At this time, the second D2L data is phase-modulated to actuate the light modulator 6 to divide one of the bits of the second D2L data into two channels whose logic levels are set in accordance with the offset of the notch P ₁ , as shown in FIGS. 13A and 13B.

The offset value of the notch P ₁ in the direction perpendicular to the direction of the track is set so that the offset of the notch P ₁ does not affect the control of the position of the read head during playback, and so that the first D2U data from the senior bits is reproduced with sufficient phase tolerance and sufficient tolerance in amplitude.

When playing an optical disc, the second data D2L recorded by the notch offset P ₁ is reproduced using the playback RFD signal received from the photodetector 82 provided in the optical pickup of the reproducing apparatus shown in FIG. 11, or using track tracking error signals.

With the optical disk according to this embodiment, even when the recess P ₁ formed on the basis of the first data D2U is offset in a direction perpendicular to the direction of the track, so that the width of the recess is different in front and rear in the longitudinal direction of the recess relative to the direction tracks, with the center T _{0 of the} track located in the middle of the notch, using the second D2L data consisting of 2 least significant bits, the first D2U data and the second D2L data can be synthesized to provide high-fidelity sound quality (ExCD audio quality) with a wide frequency range equivalent to 18 bits.

(13) Eleventh Embodiment

If in the optical disk according to this invention, the notch length P ₁ is changed in the direction of the track relative to its normal length for recording the second D2L data, then the two edges of the notch P _{1 are} necessarily present in the codeword consisting of 14 channel bits that correspond to 1 byte ( 8 bits) of audio data under EFM modulation rules, as shown in FIG. These EFM modulation rules are based on the usual CD format. In this case, the second D2L data from the 2 least significant bits can be allocated in each codeword.

At the same time, if 1-bit second D2L data is assigned to one notch P ₁ due to the notch width P ₁ or due to the notch depth P ₁ , then two notches P ₁ do not necessarily correspond to one codeword depending on the rules of EFM modulation. In this case, it is difficult to distribute the second D2L data from 2 bits in each codeword.

In this case, the second data D2L is divided into recesses P ₁ so that the first data D2U from the upper digits and the second data D2L from the lower digits are connected to each other.

In particular, in a conventional CD format, the connecting channel bits and codewords are arranged sequentially in channel clock frames, so that each frame is composed of 588 channel clock pulses. A CD frame is formed by connecting these frames. Thus, in a frame containing 588 channel clocks, or in a CD frame, the second D2L data is sequentially distributed to the corresponding notches, so that the first D2U data from the upper bits and the second D2L data from the lower bits are joined to each other.

In the optical disk preparation apparatus, the second D2L data is buffered in an amount corresponding to at least 588 channel clocks or a CD frame, and sequentially output during notches to change the normal notch length in the track direction. Using the reproducing device, the reproduced second D2L data is also buffered using the frame synchronization or subcode, and output in synchronization with the corresponding first D2U data from the high order bits for processing.

Using this optical disc, in which the first D2U data from the upper digits are divided into blocks for recording, and the second D2L data from the lower digits are distributed across the recesses of the corresponding block, the second D2L data from the lower digits are recorded, even if two recesses do not necessarily correspond to each a word on the modulation rules, it is possible to synthesize the first D2U data and the second D2L data to provide high-quality sound reproduction (ExCD sound quality) with a wide frequency range equivalent to 18 bits .

(14) Twelfth Embodiment

In the optical disk, according to this embodiment, a separate codeword of 14 channel bits is divided at the cell boundary of a given bit and the second data D2L is recorded by offsetting the front and back of the notch perpendicular to the track direction from the track center T ₀ , as shown in FIG. 14A and 14B.

To record second D2L data, consisting of the least significant bits, the notch P _{1 is} divided into the front part and the back part in the direction of the track centered in a given bit cell in the longitudinal direction of the notch, and each one bit of the second D2L data is distributed into a divided zone, while the second data D2L, consisting of 2 bits, are placed in each codeword.

If two recesses P _{1 are} distributed in this optical disk, for example, in a codeword so that the corresponding second data D2L is distributed in each codeword, then it is necessary that one of the recesses P _{1 is} no longer deformed.

Using this optical disc, in which the code word is divided at the cell boundary of a given bit, and the front and rear parts of each notch P ₁ at the bit cell boundary are shifted in the direction perpendicular to the track direction, on both sides of the track center T ₀ , a plurality of bits of the second data D2L, consisting of lower digits, can be distributed in a single recess for a corresponding increase in the recording density of the second D2L data.

In addition, each codeword can be associated with the second D2L data to accordingly simplify the processing of the recording and reproducing systems.

(15) Other embodiments

In the preceding part of the description, the second D2L data, consisting of the least significant bits, is recorded by changing the width, depth of the notch, length of the notch in the direction of the track or width of the notch perpendicular to the direction of the track, different deformation of the inner and outer edges of the notch in the direction of the track, or different offsets of the front and rear parts of the recess, relative to the direction of the track, in the direction of the inner and outer edges of the disk. However, the invention is not limited to these embodiments, since these embodiments can be used in combination. Due to this, it is possible to increase the amount of data contained in each recess, while the error correction code added to the second D2L data can be intensified, and the recording and / or reproduction of such data can have increased reliability. In addition, audio data improved by the number of bits or the amount of data can be recorded. In this case, the second D2L data associated with the codeword can be allocated to many bits to simplify the processing in the recording and reproducing systems.

In the preceding part of the description, the second D2L data consisting of the least significant bits is recorded by changing the width, depth of the notch, length of the notch in the direction of the track or width of the notch in the direction perpendicular to the direction of the track, different deformation of the inner and outer edges of the notch in the direction of the track, or different displacement front and rear parts of the recess, relative to the direction of the track, in the direction of the inner and outer edges of the disc. However, the invention is not limited to this configuration and can be used for recording in many ways. Namely, in comparison with FIGS. 13A and 13B, it can be seen that if the recess P ₁ having the front side and the rear side is offset in the direction of the outer and inner edges of the disk relative to the middle part of the recess in the longitudinal direction as a boundary, respectively, from the center T ₀ track in a direction perpendicular to the track direction, the recess P _0, which is not displaced, as shown in Figure 15B, and the recess P ₁ having a front side and a rear side offset in the direction of the inner and outer edges of the disc relative to the middle part stems ki in the longitudinal direction as a boundary, respectively, from the track center T ₀ in a direction perpendicular to the track direction, combined together, it is possible to ensure recording of multiple bits of the second data D2L consisting of LSBs, using three parameters. Even with such a recording using several parameters, a plurality of bits of the second D2L data can be distributed in the codeword to simplify the processing of the respective recording and reproducing systems.

In the preceding part of the description, an error correction code is added to the second D2L data consisting of 2 low order bits, in accordance with the processing of the first D2U data consisting of 16 high order bits, and the resulting data is interleaved. However, the present invention is not limited to this configuration since the second D2L data can be processed and recorded using processing other than that described above.

In the previous part of the description, when recording second D2L data consisting of lower digits by changing the width, depth of the notch, the length of the notch in the direction of the track or the width of the notch in the direction perpendicular to the direction of the track, different deformation of the inner and outer edges of the notch in the direction of the track, or different the displacement of the front and rear parts of the recess, relative to the direction of the track, in the direction of the inner and outer edges of the disc, the second data D2L is modulated in phase. However, phase modulation can also be used when recording second D2L data based on the difference between the inner and outer edges of the recess.

In the preceding part of the description, the inner and outer edges of the recess are offset in the central bit of the connecting bits as a special channel bit. However, the present invention is not limited to this, since the first or last bit of the connecting bits or one of the 14 channel bits in which the first D2U data is distributed can be used as a special channel bit. In this case, a plurality of bits of the second D2L data may be assigned to a single connection bit or a separate bit of 14 channel bits, respectively.

In the preceding part of the description, the inner and outer edges of the recess are offset in the central bit of the connecting bits as a special channel bit. However, the present invention is not limited to this, since the second D2L data can be recorded by changing the width or depth of the notch in a special channel bit. In this case, the second D2L data may be assigned to a single connecting bit or one of a plurality of bits of the 14 channel bits.

In the preceding part of the description, the second D2L data consisting of the 2 least significant bits of the 18-bit audio data is recorded together with the error correction code using notches obtained based on the first D2U data consisting of the 16 most significant bits. However, the present invention is not limited to this configuration, since all or part of the error correction code can be distributed in the subcode.

In the preceding part of the description, 18-bit audio data is recorded divided into 16 high-order bits and 2 low-order bits. However, the present invention is not limited to this embodiment, since it can be widely applied in the case of dividing audio data with different numbers of bits into high and low bits.

In the preceding part of the description, audio data is recorded using notches and pads. However, the present invention is not limited to this configuration since it can be widely applied to a magneto-optical disc or in a recording and / or reproducing apparatus for a magneto-optical disc for recording audio data by repeating marks and pauses.

The present invention is also not limited to recording audio data on an optical disc, since the present invention can be widely used to record video data on an optical disc.

(16) Additional embodiments

In the preceding part of the description, the second data D2L is recorded by changing the length of the recesses of the track formed from the plurality of recesses P ₁ corresponding to the first data D2U and the pads R ₁ formed between these recesses along the entire length of the track in its direction and by changing the width of the recesses in the direction perpendicular to the direction of the track, and by changing the width of the recesses from the middle part in the direction of the front or rear end of the recess. Alternatively, the second data D2L can be recorded by setting the notch length P ₂ in the middle of the notch in the direction T of the track with a width W ₁₁ that is already normal width W ₁₂ , as shown in FIG. 16. Also, the second data D2L can be recorded by forming a recess 51 with a shallower depth than the normal recess P ₁ , as shown in FIG.

The recess P _{2 of the} second data D2L recorded by changing the width W ₁₁ in the middle part of the recess relative to the direction of the track in the direction perpendicular to the direction T of the track has a duration of at least 5 T, while the recess R _{1 of the} second data D2L recorded by the formation recesses 51 with a shallower depth than a normal recess P ₁ may also have a duration of at least 5T.

By recording the second D2L data using the P ₂ notch with a duration of at least 5T, it is possible to read the second D2L data with a sufficient recognition level while preventing a decrease in the recognition level of the first D2U data recorded by the P ₂ notch.

The following is a description of the playback, i.e. reading, second D2L data.

The reproduction RF signal obtained at the output of the circuit 24 in FIG. 3 and corresponding to a recess P ₁ having a normal width W ₁₂ and a pad R ₁ not provided with a recess 51 is a reproduction signal RF1 having a normal amplitude, while a reproduction signal corresponding to a recess P ₂ having a narrow width W ₁₁ and a pad R ₁ having a recess 51 is a reproducing signal RF2 that is smaller in amplitude than the reproducing signal RF1.

In this embodiment, in which the lengths of the recess P ₂ and the pad R ₁ carrying the second D2L data have a duration of at least 5T, there is no need to normalize the reproduction RF signal in the RF signal recognition circuit 28 of the reproduction RF in FIG. 1, so that the signal RF playback from the circuit 24 is fed directly to the two-level demodulation circuit 30. The two-level demodulation circuit 30 has two threshold values, for example, the threshold value TH ₂ as an intermediate level between the reproduction signals RF1, RF2 corresponding to the site R ₁ having a recess 51 and the site R ₁ not having a recess 51, and a threshold value TH ₃ in as an intermediate level between the playback signals RF1, RF2 corresponding to the recess P ₁ , respectively, P ₂ . The two-level demodulation circuit 30 recognizes the reproducing RF signal at the output of the circuit 24 based on the threshold value TH ₂ for reproducing the second data D2L. A two-level demodulation circuit 30 also detects the reproduction signal RF based on the threshold value TH _3, to reproduce the second data D2L, recorded in the recess P _2.

(17) Additional embodiments

In the above embodiments, the second D2L data is recorded as high-frequency audio data as additional data to the first D2U data consisting of 16 high-order bits, DA audio data in the form of 18-bit parallel digital data. However, data related to the first D2U data is used as the second D2L data.

For example, if the first D2U data is 2-channel audio data, then the second D2L data may be audio data forming multi-channel audio data as part of the first D2U data. The second D2L data used in this case is the data supplied to the input of the speaker located in the center front, or the speaker located above the head of the listener, or the data supplied to the input of the left and right speakers located at the back.

The second D2L data may be data recorded as multi-channel audio data independently of the first D2U data.

If the first D2U data is the audio data of the music number containing the words, then the second D2L data is recorded as data corresponding to the instrumental part of the music number. By recording the first D2U data and the second D2L data, only the instrumental part of the musical number, including words, can be selectively reproduced, thereby realizing mixed sound reproduction.

As the second D2L data, copyright protection data may be recorded, imposing restrictions on copying the first D2U data recorded as digital data.

If the first D2U data is encoded and the second D2L data is recorded as key data for decoding the first D2U data, it is possible to prevent the free reproduction or copying of the first D2U data to provide reliable protection for the operation associated with the first D2U data.

The second D2L data may also be control data indicating that auxiliary data related to the first D2U data has been recorded with signal compression.

The second D2L data can be recorded with compression of signals with varying formats in areas completely independent of the area in which the second D2L data should be recorded.

In the area of the inner edge of the optical disc 101, on which the second D2L data is recorded together with the first D2U data, an input area 102 is provided in which the TOC data (contents table) is recorded indicating the content of the data recorded on the optical disc 101. The first data recording area 103 provided on the side of the outer edge of the input zone 102, and a second data recording area 104 is provided on the side of the outer edge of the first data recording area 103.

In the first data recording area 103, audio data is recorded in the format of a conventional CD, while in the second data recording area 104, audio data is recorded providing sound reproduction with optimal sound quality. This audio data includes audio data with a high frequency range not contained in the audio data recorded in the first data recording area 103, with signal compression provided by various signal compression means.

By recording encoding data in the form of second D2L data, it is possible to forbid the free reproduction or copying of data recorded in the second data recording area 104 to provide reliable protection of operation dependent on the second D2L data.

In this case, data for decoding the encoded data is recorded in the input zone 102. This data is recorded by deforming a plurality of recesses formed on the basis of the TOC data based on the data used to decode the encoded data.

The data recorded in the second data recording area 104 does not have to be an audio data unit, since various data, such as data forming multi-channel audio data, can be recorded together with the data recorded in the first data recording area.

By recording auxiliary data in the recesses formed on the basis of the data recorded in the first data recording area 103, it is possible to provide high quality data recorded in the first data recording area 103.

The recesses formed in the entry zone 102 may be deformed by the second data indicating the presence of the second data recording zone 104 for recording.

Industrial applicability

According to the present invention, as described above, since a plurality of grooves of a track formed by a plurality of grooves formed on the basis of the first data to be recorded and the pads between the grooves are deformed based on the second data and the deformed grooves are recorded, high-quality sound reproduction is provided. In addition, mixed reproduction of sound can be achieved by appropriate synthesizing or selecting first and second data for reproduction.

Claims (62)

1. An optical recording medium comprising a track formed by a plurality of recesses formed on the basis of the first data and pads between the recesses in which the recesses are deformed based on the second data, the recesses being deformed based on the second data with respect to their usual shape when formed on the indicated optical the recording medium and the first data is generated based on the main data recorded on the optical recording medium, and the second data is generated based on the auxiliary data to the main data. 2. The optical recording medium according to claim 1, wherein the length of the recesses in the track direction changes based on the second data regarding their normal length in the direction of the track when forming on the optical recording medium. 3. The optical recording medium according to claim 1, in which the depth of the notches varies based on the second data relative to their usual depth in the direction of the track when forming on the optical recording medium. 4. The optical recording medium according to claim 1, in which at least a portion of the width of the recesses is changed based on the second data with respect to their usual width in the direction perpendicular to the direction of the track when forming on the optical recording medium. 5. The optical recording medium according to claim 4, in which the width of a given recess having a predetermined length is changed based on the second data with respect to the normal width in a direction perpendicular to the direction of the track when forming on the optical recording medium. 6. The optical recording medium according to claim 5, in which the width of the recesses in the middle part in the direction of the track is less than the width of the other parts of the recesses in the direction of the track. 7. The optical recording medium according to claim 5, in which the width of the recesses in the direction perpendicular to the direction of the track is changed based on the second data in the front and rear parts of the recesses in the direction of the track. 8. The optical recording medium according to claim 4, in which the depth of the recesses further changes based on the second data relative to their usual depth when forming on the optical recording medium. 9. The optical recording medium according to claim 1, in which the length of the left and right parts of the recesses on both sides of the center of the track in the direction of the track is changed based on the second data. 10. The optical recording medium according to claim 1, in which the front and rear parts of the recesses in the direction of the track are offset based on the second data in a direction perpendicular to the direction of the track from the center of the track. 11. A recording device for an optical recording medium containing a light source for generating a recording laser beam, a modulator for modulating a recording laser beam emitted by the light source based on the incoming first and second data, and an objective lens for converging the recording laser beam output by the modulator onto optical recording medium, while the recording device further comprises a signal processor for generating first and second data based on the incoming data and a processor about rabotki signals generates the first and second data based on main data recorded on the optical recording medium and the sub data to the main data recorded on the optical recording medium respectively. 12. The recording device for the optical recording medium according to claim 11, in which the signal processor creates the first and second signals based on the high and low bits of the main data recorded on the optical recording medium, respectively. 13. A reproducing device for an optical recording medium, comprising an optical head for reading first and second data and identification data from an optical recording medium including a track formed by a plurality of recesses formed on the basis of the first data and pads formed between adjacent recesses, the notches are deformed based on the second data, and the optical recording medium also has identification data recorded thereon, a first demodulator for demodulating the first optical data a recording medium based on the output signal of the optical read head, a second demodulator for demodulating the second data of the optical recording medium based on the output signal of the optical read head and a controller for controlling the operation of the second demodulator based on the identification data read by the optical head from the optical recording medium. 14. The reproducing apparatus for the optical recording medium according to claim 13, wherein the identification data recorded on the optical recording medium is data indicating whether or not the second data is recorded on the optical recording medium, and in which the controller drives the second demodulator if the authentication data indicates that the second data is recorded on the optical recording medium. 15. The reproducing device for the optical recording medium according to 14, characterized in that it further comprises a signal processor for generating playback signals based on the output signal of the optical pickup head, wherein a playback signal from the signal processing processor is supplied to the first and second demodulators. 16. The reproducing apparatus for the optical recording medium according to Claim 15, wherein the second demodulator includes a signal level recognition unit for recognizing a level of reproduction signals supplied from the signal processing processor and a demodulation processor for demodulating the output signals of the signal level recognition unit. 17. The reproducing apparatus for the optical recording medium according to Claim 15, wherein the controller includes a switching unit provided between the signal processor and the second demodulator, and a recognition unit for controlling the operation of the switching unit based on the identification data, the recognition unit controlling the switching unit for supplying a playback signal to the second demodulator when the identification data indicates that the second data is recorded on the optical recording medium. 18. A reproducing device for an optical recording medium according to claim 17, characterized in that it further comprises a synthesizing unit for synthesizing the output signals of the first and second demodulators. 19. A reproducing apparatus for an optical recording medium according to claim 18, wherein the controller includes an additional recognition unit for extracting an output signal of the synthesizing unit and an output signal of the second demodulator. 20. A reproducing device for an optical recording medium according to claim 13, characterized in that it further comprises a unit for recognizing an external device for recognizing whether or not an external device connected to the reproducing device is registered with the external device, the reproducing device outputting, at least one output signal of the second demodulator, if the external device connected to the reproducing device is recognized by the recognition unit of the external device to registered to an external device. 21. The reproducing device for the optical recording medium according to item 13, in which the optical reading head includes a photodetector, divided in the direction of the track of the optical recording medium, at least the first part of the photodetector and the second part of the photodetector, and the reproducing device also includes a signal processing processor for processing the output signals of the first and second parts of the photodetector, a first demodulator, to which a total signal representing which is the sum of the output signals of the first and second parts of the photodetector, the second demodulator, which receives a difference signal from the signal processing processor, which is the difference between the output signals of the first and second parts of the photodetector. 22. An optical recording medium including a data recording area having a spiral path formed by a plurality of recesses formed on the basis of the first data and pads formed between adjacent recesses, and a control data area for recording control data therein for the first data, recorded in the data recording zone, and at least a plurality of recesses recorded in the control zone are deformed based on the second data. 23. The optical recording medium according to item 22, in which the recesses are deformed on the basis of the second data regarding their normal form when forming on the optical recording medium. 24. The optical recording medium according to item 23, in which the length of the recesses in the direction of the track is changed based on the second data relative to their usual length in the direction of the track when forming on the optical recording medium. 25. The optical recording medium according to item 23, in which the depth of the recesses is changed based on the second data relative to their usual depth in the direction of the track when forming on the optical recording medium. 26. The optical recording medium according to item 23, in which at least part of the width of the recesses is changed based on the second data relative to their usual width in the direction perpendicular to the direction of the track when forming on the optical recording medium. 27. The optical recording medium according to claim 26, wherein the width of a given recess having a predetermined length is changed based on second data regarding its normal width in a direction perpendicular to the track direction when forming on the optical recording medium. 28. The optical recording medium according to item 27, in which the width of the recesses in the middle part in the direction of the track is less than the width of the other parts of the recesses in the direction of the track. 29. The optical recording medium according to item 27, in which the width of the recesses in the direction perpendicular to the direction of the track is changed based on the second data in the front and rear parts of the recesses in the direction of the track. 30. The optical recording medium according to p, in which the depth of the recesses is additionally changed based on the second data relative to their usual depth in the direction of the track when forming on the optical recording medium. 31. The optical recording medium according to item 23, in which the length of the left and right parts of the recesses on both sides of the center of the track in the direction of the track is changed based on the second data. 32. The optical recording medium according to item 23, in which the front and rear parts of the recesses in the direction of the track are offset based on the second data in a direction perpendicular to the direction of the track from the center of the track. 33. The optical recording medium according to item 22, in which the first data is digital data recorded on the optical recording medium, and in which the second data is auxiliary data for digital data. 34. The optical recording medium according to claim 33, wherein the auxiliary data is data including at least copyright protection data. 35. The optical recording medium according to item 22, in which the first data is the upper bits of digital data recorded on the optical recording medium, and in which the second data is the lower bits of digital data. 36. The optical recording medium according to claim 22, wherein the identification data indicating whether or not the second data is recorded on the optical recording medium is further recorded in the control data area. 37. The optical recording medium of claim 22, wherein the first data is encoded data and the second data is key data for decoding the first data. 38. The optical recording medium according to item 22, in which the first data is data modulated by EFM modulation. 39. A method of recording an optical recording medium comprising modulating a recording laser beam emitted by a light source with incoming first and second data, converting a modulated laser beam onto an optical recording medium through objective lenses to form a track including at least a plurality of recesses based on the first data and pads formed between these recesses, and deformation of the recesses formed on the optical recording medium, based on the second data, while creating the first data t based on the main data recorded on the optical recording medium, and in which the second data is formed on the basis of auxiliary data to the main data recorded on the optical recording medium. 40. The method of recording an optical recording medium according to claim 39, wherein the auxiliary data is data including at least copyright protection data. 41. The method of recording an optical recording medium according to claim 39, wherein the first data is generated based on the high order bits of the main data recorded on the optical recording medium, and in which the second data is created based on the low order bits of the main data. 42. The method of recording an optical recording medium according to claim 39, wherein the first data is encoded data and the second data is key data for decoding the first data. 43. The method of recording an optical recording medium according to claim 39, wherein the recesses are deformed based on the second data with respect to their usual shape when formed on the optical recording medium. 44. The method of recording an optical recording medium according to item 43, in which the length of the recesses in the direction of the track is changed based on the second data relative to their usual length in the direction of the track when forming on the optical recording medium. 45. The method of recording an optical recording medium according to claim 43, wherein the depth of the recesses is changed based on the second data relative to their usual depth in the track direction when forming on the optical recording medium. 46. The method of recording an optical recording medium according to claim 43, wherein at least a portion of the width of the recesses is changed based on the second data with respect to their normal width in a direction perpendicular to the direction of the track when forming on the optical recording medium. 47. The method of recording an optical recording medium according to claim 46, wherein the width of a given recess having a predetermined length is changed based on second data regarding its normal width in a direction perpendicular to the track direction when forming on the optical recording medium. 48. The method of recording an optical recording medium according to clause 47, in which the width of the recesses in the middle part in the direction of the track is less than the width of the other parts of the recesses in the direction of the track. 49. The recording method of the optical recording medium according to clause 47, in which the width of the recesses in the direction perpendicular to the direction of the track is changed based on the second data in the front and rear parts of the recesses in the direction of the track. 50. The method of recording an optical recording medium according to claim 46, wherein the depth of the notches is further changed based on the second data relative to their usual depth in the track direction when forming on the optical recording medium. 51. The method of recording an optical recording medium according to item 43, in which the length of the left and right parts of the recesses on both sides of the center of the track in the direction of the track is changed based on the second data. 52. The method of recording an optical recording medium according to claim 40, wherein the front and rear parts of the recesses in the direction of the track are offset based on the second data in a direction perpendicular to the direction of the track from the center of the track. 53. The method of recording an optical recording medium according to item 43, in which the first data is digital data recorded on the optical recording medium, and in which the second data is auxiliary data for digital data. 54. The method of recording an optical recording medium according to claim 50, wherein the auxiliary data is data including at least copyright protection data. 55. The method of recording an optical recording medium according to claim 39, wherein the first data is senior and junior data of digital data recorded on the optical recording medium. 56. The method of recording an optical recording medium according to claim 39, wherein the first data is encoded data and the second data is key data for decoding the first data. 57. A method of reproducing an optical recording medium comprising demodulating first data based on data reproducing signals read from an optical recording medium including a track formed by a plurality of recesses formed on the basis of the recorded first data and pads formed between adjacent recesses, the recesses being deformed based on the second data, and the optical recording medium also has identification data recorded thereon, demodulating the second data based on the reproduction signals data read from the optical recording medium based on the recognition results of the identification data read from the optical recording medium. 58. The method of reproducing an optical recording medium according to claim 57, wherein if the identification data recorded on the optical recording medium indicates that second data is recorded on the optical recording medium, the second data is demodulated based on data read from the optical recording medium . 59. The method of reproducing an optical recording medium according to claim 57, wherein the level of the data reproducing signals read from the optical recording medium is recognized to demodulate the second data. 60. The method of reproducing an optical recording medium according to claim 57, wherein the demodulated first data and the demodulated second data are synthesized and output. 61. The method of reproducing an optical recording medium according to claim 57, wherein further, if it is recognized that the external device is a registered external device, then at least demodulated second data is output. 62. The method of reproducing an optical recording medium according to claim 57, which uses an optical pickup head including a photo detector divided in the track direction of the optical recording medium into at least a first part of the photodetector and a second part of the photodetector, the first data is demodulated based on the total signal, which is the sum of the output signals of the first and second parts of the photodetector, and the second data is demodulated based on the difference signal, which is the difference of the output signals per oh and second photodetector portions.

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