KR20010074868A - Addition of watermark keys according to a flexible format - Google Patents

Abstract

Adding a mark of a first physical form to encode data of an encoded signal on a disc shaped recording medium and insert ancillary data in an encoded signal different from the format used to record the signal. This ancillary data is encoded according to a second format, which is different from the format used to encode the data of the encoded signal. The format description information related to the second format is recorded on a macro recording medium having the same physical form but modulated according to a second different modulation or on a second type of macro recording medium having different physical characteristics with respect to the first format.

Description

[0001] ADDITION OF WATERMARK KEYS ACCORDING TO A FLEXIBLE FORMAT [0002]

The present invention relates to a method of inserting supplemental data into an encoded signal and recording the signal on a disc shaped recording medium as recited in the opening paragraph of claim 1. The present invention also relates to an apparatus for carrying out the method, a disc-shaped recording medium obtained by the method, and an apparatus for reproducing data recorded in such a disc-shaped recording medium.

There is an increasing need to include ancillary data in audio and video signals. The watermark is an auxiliary data message inserted into the multimedia information provider, preferably in a perceptually invisible way. Such watermarks include, for example, information about the source and copyright status of documents and audiovisual programs. In addition, watermarks can be used to provide legal evidence of copyright owners, track copyright infringement, and support the protection of intellectual property rights.

European Patent Application No. 98900036.9, document D1, which is found in the reference list at the end of this specification, discloses a conventional method of inserting ancillary data into encoded audio and video signals without actually affecting perceptual quality Lt; / RTI > Here, it is disclosed to encode an audio signal with a single bit encoder, such as a sigma-delta modulator, as is proposed for recording high-quality audio in an audio version of a digital versatile disk (DVD). Such an encoder produces an output stream that includes a 1-bit output sample of each encoding step as compared to a multi-bit sample. The digital watermark pattern is inserted, for example, by replacing the 100th bit of the output stream with the bits of the digital watermark pattern.

This method has considerable weaknesses against copyright infringement. The format of the inserted data must be fixed because the decoder is designed in hardware in the player. I will code all disks according to this format. Possible copyright infringers get a lot of data coded in this fixed format. Once the copyright infringer knows the coding format, he can decrypt all future content and develop techniques to circumvent all protection.

In addition, European Patent 706 174, reference D2 of the reference which can be found at the end of this specification, discloses a method for preventing piracy of an output stream recorded in the form of a pit on an optically readable recording medium such as a CD-ROM . The method disclosed herein involves optical or magnetic recording on a disc in such a way that it can determine the unique physical characteristics of the disc, encrypt this information and distinguish it from the main information recorded on the disc. In the reproduction of the main information, the physical characteristics of the disk are measured again and the attached physical information is checked to determine whether a particular relationship exists between them. Such physical information may be a pit angular arrangement, pit depth and tracking amount, a low reflector of the auxiliary, a dust location, and the like. However, the physical properties are complicated to produce because they have to be measured for each disk. Furthermore, it is not possible to insert predetermined watermark information by this method.

After all, among other things, the object of the present invention is to solve the above-mentioned disadvantages. The method according to the invention in one aspect of the invention has the features as described in the characterizing part of claim 1.

This allows a flexible format for inserting the inserted data, and the format may be specific to each recording medium or group of recording media. If the copyright infringer knows the format of the inserted auxiliary data for one recording medium, he does not know this content for the other disk. The secure protection can be obtained by disposing the description of the flexible format on a different appearance on the recording medium. This was obtained with other modulations of the same physical form, for example marks such as optical or magnetic forms. Or in other physical, optical, or magnetic forms. Generally, the bit duplicating machine only replicates the variation of the first physical parameter obtained by the first modulation processing, as these fluctuations represent the recorded main information. Only the dedicated reproducing apparatus will be able to detect the variation of the second physical parameter as obtained by the second modulation processing.

Other advantageous aspects of the present invention relating to an apparatus for inserting auxiliary data into a disc shaped recording medium, a recording medium and an apparatus for reproducing data of such a recording medium are described in dependent claims 13, 24 and 35, respectively.

Another advantageous aspect of the present invention is described in claim 2. This allows to combine recording means for both signals in a large range. The recording means and the reproducing means may also be combined.

Some advantageous embodiments using modulation of the same local area are described in dependent claims 3, 4 and 5.

Yet another advantageous aspect of the present invention is described in other dependent claims. A particular beneficial embodiment is described in claim 7.

BRIEF DESCRIPTION OF THE DRAWINGS These and other aspects and advantages of the invention will be apparent from and elucidated with reference to the preferred embodiments, with particular reference to the accompanying drawings, in which:

Fig. 1 shows an optically readable recording medium composed of optically detectable marks,

Fig. 2 shows an apparatus according to the invention for recording encoded data and auxiliary data on a recording medium as shown in Fig. 1,

Figure 3 shows in more detail an embodiment variant of the encoded signal,

Figure 4 shows an example of a variant encoded bit stream,

Figure 5 shows an apparatus according to the invention for reproducing encoded data from a recording medium and extracting auxiliary data as shown in Figure 1,

Figure 6 shows in more detail the means for extracting auxiliary data from a stream composed of encoded data and auxiliary data,

Figure 7 illustrates a method according to the present invention for inserting ancillary data into an encoded signal.

1 shows a possible embodiment of a recording medium 1 of the optically readable form for use according to the invention. FIG. 1A is a plan view showing an arrangement of marks that can be optically read along a track having a center line at 2; FIG. 1B is a greatly enlarged plan view of a portion 3 showing an optically readable mark 4 arranged along a track 2 and an intermediate region or space 5. Fig. The optically readable mark 4 at this time is in the form of a local depression or so-called pit. However, other forms of optically readable marks are suitable, for example, as if obtained with a phase change material. This mark 4 results in the modulation of the intensity of the reflected beam of the radiation beam scanning along the track 2. [ In Fig. 1C, signal 6 shows the modulation when the pattern of mark 4 and space 5 is scanned along track 2 at a constant linear velocity. The length of the mark 4 along the track 2 and the intermediate space 5 corresponds to a plurality of bit cells (including one) of the signal 6. The length T of one bit cell corresponds to the period T of the data clock of the signal. In Fig. 1B, one bit cell is represented by a track portion having a length L. In Fig.

However, in the name of the applicant in the document D3 in the list of reference documents which can be found at the end of this specification, another modulation form can be obtained, for example as disclosed in European Patent Application No. 91203147.3. Fig. 1D shows an example using variation of the width of the optically detectable mark 4 as an example. This results in additional intensity modulation in the radiation beam scanning along the track 2, which is the two components in the corresponding signal 6. If the frequency spectrum of the component caused by this length modulation does not overlap with the frequency spectrum of the component caused by the width modulation, the information presented by the positive modulation can be recovered separately. Fig. 1E shows an embodiment in which the variation of the track position in the lateral direction is used for the track 2. Fig. This position modulation has the form of a track undulation known as a radial track wobble. Further, the track wobble at this time can be easily detected by the beam scanning means such as that used for the detection of the mark 4. [ Another modulation is obtained by using the variation of the depth or the position of the mark on the plane of the recording medium 1. [ 1F is a sectional view of a portion 3 of the recording medium 1 along line b-b showing such modulation. Reference numeral 7 denotes a transparent substrate. This substrate 7 is covered with a reflective layer 8. The protective layer (9) covers the reflective layer (8). This substrate 8 is made up of optically readable marks 4 in the form of pits. Variations in the position or depth of the pits 3 are indicated by lines 10 and 11. When scanning a pattern with a focused radiation beam as shown in FIG. 1F, the variation in the plane of the mark 4 occurs with a focus error, which can be easily detected.

2 shows an embodiment of an apparatus according to the invention for inserting ancillary data into an encoded signal and recording the encoded signal on a disc shaped recording medium as shown with reference to Fig. The first data signal D1 is received at the first input terminal 20. This data signal D1 represents data, video or audio information, and so on. When this data signal D1 is in analog form, the digital-to-analog converter 22 is configured to convert the analog data signal D1 into a digital data signal. Generally, this A / D conversion results in an n-bit digital signal in the case of an audio signal, but often a 1-bit A / D converter is used to convert it into a 1-bit bitstream signal BS. This bitstream signal BS is a binary signal since it has only two different representative symbols, " 0 " or " 1 ". Is - (d-delta modulator also called bitstream converter or sigma) is the sample frequency of a number n of the audio signal D1 general, f _s = 44.1, 48 or 32kHz, for example 64 * 44100 = 2822400Hz such one-bit A / D converter It can be sampled in frequency. Audio signal D1 has been applied in digital form sampled at a sample frequency f _s of 44.1kHz, if the sample, for example, 16 bits per sample represented, the digital audio signal is oversampled at a sampling frequency f _s is the frequency of a number n And becomes a 1-bit bitstream signal BS.

Converting an audio signal into a 1-bit bitstream signal has several advantages. Bitstream conversion is a high-quality encoding method with the potential of high-quality decoding or low-quality decoding with the benefit of future sampler decoding circuitry.

An auxiliary data signal D2, for example a watermark, which should be inserted into the data signal D1 or in the corresponding bitstream BS, is received at the input terminal 23. [ To insert the auxiliary data signal D2 into the binary stream BS, the transforming means 24 is configured to transform the bit stream BS. European Patent No. 706 174, in the name of the applicant, D2 in the list of reference documents which can be found at the end of this specification, inserts its auxiliary data D2 into a binary stream BS which does not actually affect the perceptual quality Method is disclosed. Hereinafter, this modification will be described in more detail, but it should be noted that not only encryption of the bitstream BS but also replacement of a specific bit of the bitstream BS is included. For example, the watermark bit can replace one bit per 100 bits. This increases the quantization noise, but does not prevent the data D1 from being reproduced in comparison with the encryption. A method such as that disclosed in document D2 is designed to limit the rise of quantization noise to a range above that.

This auxiliary data signal D2 is inserted into the bit stream BS 'according to a specific encoding format. Some other encoding formats according to the invention may be used for this purpose. Many possible formats are numerous and specific for each disk or group of disks. Therefore, the format generating means 25 is configured to generate the specific encoding format indicated by the format description signal F applied to the modifying means 24. [ As a result, a modified bit stream BS 'containing one bit with a frequency of n · f _s is applied continuously to a decimation filter 26 to produce a multi-bit stream, such as the frequency of f _s Bit stream. This multi-bit stream is adapted to channel encoding means 27 such as EFM modulation for converting 8-bit wide data bytes into 14-channel bit wide channel words, for example. In addition, error correction information is added.

In order to record the channel bits in the optically readable recording medium 1, the recording radiation beam has to be modulated according to the channel bits. For this purpose, the modulation means 29 modulates the length between the optically readable marks and spaces arranged on the tracks of the recording medium 1 according to the obtained channel bits. This length modulation is schematically shown in Fig. 1B.

The recording section 30 has means for positioning the recording spot of the radiation beam in the radial direction of the circular recording medium 1 in accordance with the drive signal provided by the modulation means 29 via the laser section and the optical element . In combination with the driving means 31 for rotating the recording medium 1 in accordance with the drive signal obtained from the modulating means 29, the recording spot can be moved along the track. The channel bit obtained by the modulation section 29 controls the laser section.

The synchronization signal S generated by the clock generating means 32 is used to determine the channel cell write rate and the channel clock period T as shown in Fig. In addition, the control means 35 is configured to generate a control signal C for controlling the device.

Further, the format description information F is applied to the second encoding means 33 for encoding this information into the second encoded signal. This second encoded signal requires the modulation of another recording radiation beam of the length modulation previously mentioned by the second modulation means 34. [ Some of these other modulation examples are shown in Fig. The examples shown here are examples of the width of the mark 4 (Fig. 1D), the position of the track 3 of the mark 4 (Fig. 1E) or the position of the mark in the recording medium 7 2 modulation. Another type of modulation is to place the radially oriented strip near the center of the disc, modulating the track pitch width, and so on.

Further, the reproducing apparatus should be capable of reading the recorded encoded and modified bit stream and the format description information recorded by the other modulation processing. This allows the decoder of the ancillary data to be programmed to support the flexible encoding format of the ancillary data. This is even specific for each disc. The recorded bit stream having the encoding format corresponding to the inserted auxiliary data is connected to the same medium to ensure comfortable usage. Both parties are connected to the original legitimate content. Not only the ancillary data such as watermark data but also the format used to encode this ancillary data with other modulation techniques is not sufficient to simply copy the encoded transformed bit stream.

It should be noted that the recorded medium 1 composed of this information is developed, for example, directly or indirectly on the mother disc with the photosensitive layer for the phase change data, then developed the inspected disc, And the final recording medium 1 is produced by using a stamp by injection molding by adding and molding the reflective film and the protective layer.

In general, a 1-bit A / D converter may be a bit-stream signal, referred to as a single-bit encoder and encoded as a single-bit signal. Examples of single bit encoders are delta modulators, sigma-delta modulators and noise shape encoders. They also belong to an encoder system with a feedback loop. Sigma-delta modulation is observed in recording high quality audio to an audio version of a digital versatile disc (DVD) using a sampling frequency f _s of 2822400 Hz (64 * 44100) and a signal-to-noise ratio of 115 dB.

FIG. 3 shows an example of a sigma-delta modulator as an embodiment of the analog-to-digital converter 22 in FIG. Another embodiment is disclosed in document D1. This data signal D1 is applied to the adder 41 and subtracts the output signal BS from the input signal D1. The resulting error signal is applied to a decoding filter 42 (adder or integrator) to obtain a prediction signal that requires the polarity detector 43. The polarity detector 43 generates an output sample +1 or -1 depending on the polarity of a determined ratio to the sampling frequency f _s, a prediction signal. In this embodiment, the multiplexer 44 consists of the modification means of Fig. This multiplexer 44 changes the selected bit (e.g., each hundredth bit) of the output of the polarity detector 43 to the watermark bit pattern D2 according to the selection signal SEL. In fact, the signal-to-noise ratio of 115 dB is obtained by encoding the audio signal at a sampling frequency of 2822400 (64 * 44100) Hz with the sigma-delta modulator shown in FIG. What this shows is that changing one sample per 100 samples increases the synchronization noise by only 1 dB. This corresponds to a watermark bit rate of 28000 bits / sec.

Another example of inserting the watermark data D ₂ is to invert a sample of the encoded signal y, wherein the watermark data D ₂ is represented by a number of bit periods between consecutive inverted samples.

Fig. 4 shows an example of an input waveform 51 encoded with the embodiment shown in Fig. This input waveform 51 corresponds to the input signal D1 in Fig. 3, while reference numeral 52 denotes the encoded output signal corresponding to the bit stream BS in Fig. This sigma-delta modulator produces a larger amount of samples as the input signal becomes larger. An input voltage of -0.5V is encoded as a sequence of three -1V pulses and one + 1V pulses, and the input voltage of 0V is -1V and + 1V pulses (apart from the inserted watermark pulse 54) Is encoded as an alternating pattern, and an input voltage of +0.5 V is encoded as a sequence of three + 1V pulses and one -1V pulse. This encoded signal is re-encoded at the receiving end by redefining the received pulses and passing them through the low pass filter. In the embodiment of Figure 3, the encoded signal is demodulated by averaging thirteen samples of the bit stream 52. Reference numeral 53 denotes a reconstructed signal separately from the time delay caused by the averaging operation.

In this example, watermarking is performed by changing -1 sample to +1 sample. Reference numeral 54 denotes this watermark sample. The alternating pattern of + 1V and -1V pulses is explicitly interrupted. However, the insertion effect of the watermark is limited because the reconstructed signal 53 is similar to the input signal 51. [ This is compensated for in the feedback loop, as described in more detail in document D1, by the effect being fed back to the input and continuously encoding the input signal after watermark insertion.

It is to be understood that although the present invention has been described with reference to the embodiments using the method of encoding and watermarking as described above, the present invention is not limited thereto.

The method for inserting insert data is not very flexible. The number of the inserted data and the precise position can be freely selected. In FIG. 3, the selection signal SEL determines which of the bit streams is a watermark bit. This information SEL is included in the general form of the format description information F generated by the format generation means 25 in Fig. From this very briefly, the format description information F only includes the number N indicating that the Nth bit of the bit stream is the watermark bit. For example, by changing the 6th, 16th and 26th bits of the bit stream to -1V, -1V and + 1V bits respectively, the corresponding watermark pattern D ₂ = '001' is obtained.

Other methods of inserting may use the same method as the inverse selection sample of the bit stream, for example, in which the watermark data is represented by a plurality of bit periods between successive inverted samples.

Obviously, a more complex format may be used to insert watermark data if high security is desired. Instead of the fixed number N, a sequence changing the number is used, and the sequence at this time is generated according to a specific algorithm.

However, the secure protection according to the present invention is obtained by allowing a flexible format for inserting watermark data. This requires that the format description be further recorded in order to inform the programmable decoder in the playback apparatus. As mentioned with reference to Fig. 2, the second encoding means 33 and the second modulation means 34 are used for the purpose of providing much safer protection. Only the dedicated reproducing apparatus having the specific detecting means enables extraction of the inserted watermark data.

It should be noted that watermark data or other control data insertion in the described method does not involve encrypting the main audio, video or general data or the like. The encoded bit stream is only affected by a small amount of noise that leads to an equivalent reduction in the signal-to-noise ratio. However, encryption and decryption require many data processing circuits that lead to high cost.

Hence, the step of modifying the encoded signal is performed within the feedback loop of the encoder. Thus, any modification of the encoded signal for watermarking will be compensated with a continuous coding operation by feedback.

5 shows an apparatus according to the invention for reproducing encoded data and extracting auxiliary data from a recording medium in an optically readable form.

The disc 1 having an optically readable mark as shown in Fig. 1 is rotationally driven by the disc rotating means 61. Fig. The optical pickup unit 62 irradiates the disc 1 with a radiation beam generated by, for example, a semiconductor laser. The radiation beam or optical pickup portion 62 is drivable in the radial direction of the disk 1. [ The disc 1 is scanned with a radiation beam along the circular track 2. [ The radiation reflected by the disk 1 is detected by a radiation detection detector in the optical pickup section 62 and converted into an electrical detection signal. This variation of the electrical detection signal is reflected by the modulation in the detected radiation as it is induced by the optically detectable marks of the disc 1. [ This detection signal is applied to a first demodulation means 64 for obtaining a focus control signal and a tracking error signal which are both signals used for controlling the optical pickup section 62. [ The speed control signal is also applied to the disk rotating means 61. For example, the synchronization signal S, including the sampling frequency f _s is obtained by the demodulation means 64 from the detected signal. This signal f _s is used for decoding purposes, especially at the decoder.

The first demodulating means 64 is configured to detect a change in the electrical detection signal caused by the length of the mark and the variation in the space between the marks. Fig. 1B shows an arrangement of the marks 4, and Fig. 1C shows an example of a corresponding electric detection signal 6. Fig. In combination with the obtained synchronization signal S, which determines the data clock period T, the channel bits are obtained from the electrical detection signal. This channel bit is therefore converted into data bits by first decoding means 65 using EFM + demodulation, such as is known from EFM demodulation or digital multifunctional disk (DVD) data processing as known from compact disc (CD) . In addition, error correction is used. As a result, the data stream at this stage includes a 16 bit wide word of the sampling frequency f _s . As an example, in the case of audio data, the multi-bit stream is transformed into a binary bit stream by an interpolation filter 66 having a sampling frequency of n · f _s . This bit stream is applied to a 1-bit D / A converter 67 to re-convert the bit stream audio signal to the original analog audio signal D ₁ .

The second demodulating means 68 according to the present invention is configured to obtain the information from the fluctuation in the detection signal caused by the length of the mark and the variation outside the space between the marks. For example, variations in width, radial position or depth, as shown in Figs. 1D, 1E and 1F, respectively. The variation of the radiation position is independent of the variation of the length by the tuning band filter when the radiation variation is represented by another frequency range. Variations in depth or width are likewise discrete. In addition, other types of variations may indicate, for example, marks that extend radially in the disc 1.

A signal, e.g., a channel bit cell signal, that results from the demodulation of the detection signal by the second demodulation means 68 includes the format description information encoded as described above. This information is decoded by the second decoding means 69 into a data word representing the format description information. The second decoding means 69 supplies the format description signal F to the programmable decoder 70 on the basis of the received format description information. With this signal F, the programmable decoder 70 is programmed in such a way that the auxiliary data inserted in the bitstream according to the corresponding format can be extracted therefrom. To this end, the programmable decoder 70 receives the decoded bit stream from the first decoding means 65.

Using the format description signal F, the programmable decoder 70 is instructed or programmed to extract auxiliary data inserted into this bit stream in accordance with the format description indicated by the signal F thereof. The format description information F includes a complete description of the format used for encoding the auxiliary data or only the portion thereof. For example, the format description information F is configured to adjust these numbers while the programmable decoder 70 is a number or a series of numbers, which means that a plurality of bit streams contain auxiliary data, as described above. In addition, the format description information includes only a part of the entire format description necessary for decoding. In that case, the additional portion may be stored in advance in the second decoder 70. [

Figure 6 illustrates in greater detail an embodiment of the programmable decoder 70 in Figure 5 for extracting an embedded watermark from a delta modulated bitstream. The modified encoded bit stream BS 'as generated by the first decoding means 65 is applied to the data input of the register 80 clocked by the selection signal SEL. The output of the register 80 is a watermark pattern or other control data D ₂ . This selection signal SEL determines which bits in the bit stream BS 'are watermark bits. Is generated by a divider stage 81 that divides the sample frequency fs by a number n, for example, 100, specified by the format description signal F as generated by the second decoding means 70. [ The selection signal SEL is synchronized in accordance with a corresponding signal in the recording apparatus. This synchronization can be achieved by including a predetermined synchronization bit pattern in the watermark signal D ₂ . In this embodiment, the synchronous detector 82 detects the pattern and changes the phase of the frequency divider stage 81 until a synchronous pattern is detected.

Another detailed embodiment for extracting watermark data D ₂ can be found in document D2. Note that the functionality of some means may be combined into one means, or some means may be omitted. For example, the first decoding means 65 and the programmable decoding means 70 can be combined in one decoding device. Also, the first and second demodulation means 64 and 68 can be actually arranged in one portion.

Another embodiment of the playback apparatus is obtained when a recording apparatus such as that shown with reference to FIG. 2 is used as a home recorder and records a so-called open watermark in a bitstream according to a public format. This will enable all discs to be watermarked and also to enable home recording. A corresponding playback apparatus such as that described with reference to Fig. 5 in combination with the same recording apparatus can detect this public watermark, because its format is known. In contrast, the format corresponding to the so-called private watermark can be stored for official release only in industry.

Instead of or in addition to the watermark information D ₂ , the control information may be inserted into the encoded bit stream BS '. Therefore, this control information may be used to control the playback apparatus.

Figure 7 illustrates a method according to the present invention for inserting ancillary data into an encoded signal. First, in step 91 (1ST_DAT), main first data such as video, audio, or general data is received. This first data is encoded in step 93 (ENC_1ST_F) with channel data configured for recording or transmission according to a first format, e.g., as used in a CD or DVD. In step 92 (SUP_DAT), auxiliary data to be inserted into the main data is received. In step 94 (2ND_F), a second format is generated, which is used as a rule to transform the encoded first data in step 95 (MOD) to insert the ancillary data. Further, in step 96 (ENC_3RD_F), description information characterizing the second format or a part thereof is encoded into the channel data according to the third format (which may be the same as the first format). On the other hand, in step 97 (1ST_MOD), the variably encoded first data is modulated in accordance with the first modulation process to a signal that is configured to be recorded on a specific recording medium or transmitted to a transmission channel. In step 98 (2ND_MOD), the encoded second format description information is modulated into a signal configured for recording on a specific recording medium according to the second other modulation processing. In step 99 (W), the two signals are recorded by the same recording process, for example, a light scanning beam. However, the two recording processes may be performed separately or may be different from each other. Preferably, this same recording process is used because there is an advantage that reproduction may be performed in one recording process.

Note that, in the above-described embodiment of the method of inserting auxiliary data, only one example is given. Some steps may be performed in parallel or in series without departing from the invention.

While the present invention has been described with reference to preferred embodiments thereof, it is obvious that these embodiments are not given to limit the present invention. Accordingly, various modifications may be made to those skilled in the art without departing from the scope of the present invention as set forth in the claims. The present invention can be implemented using hardware and software, and many " means " can be represented by hardware of the same item. Moreover, the present invention encompasses all novel features or combinations of these features. Also, the term " comprising " does not exclude the presence of elements or steps other than those listed in the claims. The reference numerals do not limit the scope of the present invention.

List of references:

(D1) European Patent Application No. 98900036.9 (PHN16209)

(D2) European patent 706 174

(D3) European Patent Application No. 91203147.3 (PHN13922) in the name of the present applicant.

Claims (44)

Encoding the first data to obtain a first encoded signal according to a first format, Transforming the first encoded signal to insert ancillary data according to a second format, A mark of a type arranged in a circular track of the disc and having a different physical characteristic related to the peripheral area modulated in the first modulation process in accordance with the encoded signal in which the length and space of the mark are modified in the track direction, And recording the modified first encoded signal on a disc shaped recording medium such as an optically readable disc, the method comprising the steps of: Generating a second signal indicative of format description information related to the second format in order to enable the extraction of auxiliary data in the future, Encode the second signal to obtain a second encoded signal, A second modulated signal different from the first modulated signal by adding a mark of the same type modulated according to the second encoded signal or by adding a second modulated signal according to the second modulated signal, Adding a mark of the form to the second encoded signal to the recording medium. The method according to claim 1, Wherein the recording of the modified first encoded signal and the second encoded signal adds a mark required for the first and second modulation processes. 3. The method of claim 2, Wherein the second modulation process modulates the mark in a non-tangential direction with a geometric structure. The method of claim 3, And the second modulation process includes mark width modulation. The method of claim 3, And the second modulation process comprises modulation of the track radius of the mark. The method according to claim 1, Wherein the second modulation process adds a mark extending radially in the central region of the recording disk. The method according to claim 1, Wherein the encoding of the first data comprises a single bit encoding. 8. The method of claim 7, Wherein the encoding of the first data comprises sigma-delta encoding. The method according to claim 1, The transformation of the encoded first signal may include modifying the sample by the sample of the auxiliary data by selecting a sample of the encoded first signal in accordance with a selection rule and characterized in that the format description information includes the selection rule Lt; / RTI > 8. The method of claim 7, Wherein transforming the encoded first signal comprises inverting the sample by selecting a sample of a single bit encoded first signal according to a selection rule, wherein the inserted data is represented by a plurality of sample periods between successive samples, And the format description information includes the selection rule. 10. A method according to any one of the preceding claims, Wherein the auxiliary data includes device control data for controlling reproduction of data recorded on the recording medium. 10. A method according to any one of the preceding claims, Wherein the second signal indicates control data for controlling reproduction of data recorded on the recording medium in addition to the format description information. A first input terminal for receiving a first data signal, A second input terminal for receiving an auxiliary data signal, First encoding means for converting a first data signal into a first encoded signal according to a first format, Transforming means for transforming the encoded first signal according to a second format for inserting auxiliary data, Recording a modified first encoded signal on a recording medium by adding a mark of a type arranged in a circular track of the disc and having a shape having a different physical characteristic related to the peripheral area, And recording means for recording the encoded signal on a disc shaped recording medium such as an optically readable disc, wherein the recording means includes recording means for recording the encoded signal, The apparatus comprising: Generating means for generating a second signal indicating format description information related to a second format for enabling retrieval of auxiliary data in the future, And second encoding means for encoding the second signal to obtain a second encoded signal, Second modulating means for modulating said type of mark in accordance with a second encoded signal differently from said second modulating means, Wherein the recording means is configured to add to the recording medium the mark of the type modulated by the second modulating means or the recording means is adapted to add a second form of modulating the first encoded modulated signal to a second modulated form Of the mark. 14. The method of claim 13, Wherein the recording means is configured to add a mark required for modulation by the first and second modulation means and to record the modified first encoded signal and the second encoded signal. 15. The method of claim 14, And the second modulation means is configured to modulate the mark of the geometric structure in a non-tangential direction. 16. The method of claim 15, And the second modulation means is configured to modulate the track radius of the mark. 14. The method of claim 13, And the second modulation means is configured to add a mark extending radially in the central region of the recording disk. 14. The method of claim 13, And wherein the second encoding means is configured with a single bit encoding. 19. The method of claim 18, And the second encoding means comprises sigma-delta encoding. 14. The method of claim 13, The modifying means is configured to select a sample of the first encoded signal according to a selection rule and to modify the sample by a sample of the auxiliary data, Wherein the generating means is configured to generate a second signal indicative of format description information including the selection rule. 19. The method of claim 18, Wherein the transforming means is configured to select a sample of a first bit encoded single bit in accordance with a selection rule to invert the sample so that the embedded data is represented by a plurality of sample periods between the successive samples, Wherein the generating means is configured to generate a second signal indicative of format description information including the selection rule. 22. The method according to any one of claims 13 to 21, Wherein the modification means is configured to insert the device control data into the auxiliary data to control a device configured to reproduce the data recorded on the recording medium. 24. The method according to any one of claims 13 to 22, Wherein the generating means is configured to generate, in addition to the format description information, device control data for controlling an apparatus configured to reproduce data recorded on the recording medium. 13. An optically readable recording medium having a signal recorded according to any one of claims 1 to 12. A first encoded signal is recorded on the circular track of the recording medium by a first modulation in the track direction of the length of the mark and the length of the mark of the type having different physical characteristics related to the peripheral area, A disc shaped recording medium, such as an optically readable disc, in which a signal represents first data encoded according to a first format and auxiliary data inserted therein according to a first format, The second encoded signal is recorded on a second type of macro recording medium having a second modulation different from the first modulation of the mark of the type or having different physical properties for the first type, Wherein the second encoded signal indicates format description information related to a second format for enabling extraction of auxiliary data. 26. The method of claim 25, Wherein the first and second encoded signals are recorded thereon with a mark of the type required for the first and second modulation thereon. 27. The method of claim 26, And the second modulation includes modulation of a mark of a geometrical structure in a non-tangential direction. 28. The method of claim 27, And the second modulation includes mark width modulation. 26. The method of claim 25, Wherein the second modulation applies a mark extending in a radial direction in a central region of the disc-shaped recording medium. 26. The method of claim 25, Wherein the first data is single-bit encoded. 31. The method of claim 30, Wherein the first data is sigma-delta encoded. 26. The method of claim 25, The first encoded signal includes a selected sample according to a selection rule, The sample is transformed according to the auxiliary data, And the format description information includes a selection rule. 31. The method of claim 30, Wherein the first encoded signal comprises an inverted sample of a single bit encoded first signal selected according to a selection rule, wherein a plurality of sample periods between successive samples represent auxiliary data, And the format description information includes the selection rule. 34. The method according to any one of claims 25 to 33, Wherein the auxiliary data includes device control data configured to control reproduction of data recorded on the recording medium by the reproducing device. Means for rotationally driving a disc-shaped recording medium in which data is recorded in the form of a mark having a shape having a different physical characteristic related to a peripheral region, A pickup unit scanning the mark of the above shape and converting the received signal into an electric detection signal, First demodulating means for demodulating the electric detection signal for searching for a data signal occurring from a first modulation in a track direction of a length of a mark and a space arranged in a circular track of the recording medium, First decoding means for decoding the data signal, the first data signal encoded according to the first format and the inserted auxiliary data signal encoded according to the second format, A signal reproducing means for reproducing a signal in accordance with the first data signal, An apparatus for reproducing data recorded on a disc-shaped recording medium such as an optically readable disc including control means for receiving the inserted auxiliary data signal and controlling the apparatus, A second demodulating means for demodulating an electric detection signal for extracting a second data signal resulting from a second other modulation of the mark constituted in the above form or a second demodulating means for demodulating a mark of a second type having a different physical property with respect to the first mode The pickup unit configured to convert the received signal into a second data signal, Second decoding means for decoding from the second data signal which is a format description information signal related to the second format, The control means including programmable decoding means for extracting and decoding the inserted data, Wherein the programmable decoding means is configured to receive the format description information signal and to decode and extract the inserted data according to the format description information signal. 36. The method of claim 35, Wherein the demodulating means is configured to demodulate the electrical detection signal occurring from the pits of the type requiring the first and second modulations. 37. The method of claim 36, Wherein the second demodulating means is configured to demodulate the electrical detection signal resulting from the modulation of the mark of the geometrical structure in non-tangential direction. 39. The method of claim 37, And wherein the second modulation includes mark width modulation. 36. The method of claim 35, Wherein the second demodulating means is configured to demodulate the electric detection signal occurring from the mark extending radially in the central region of the disc-shaped recording medium. 36. The method of claim 35, Wherein the first decoding means is configured to decode the single bit encoded data signal. 36. The method of claim 35, Wherein the decoding means is configured to decode the sigma-delta encoded data signal. 36. The method of claim 35, The first data signal includes a sample selected in accordance with the selection rule, the sample being transformed according to the auxiliary data, And the format description information includes a selection rule. 41. The method of claim 40, The first data signal comprises an inverted sample of a single bit encoded first signal selected according to a selection rule, a plurality of sample periods between successive samples representing an embedded data signal, Wherein the format description information signal comprises the selection rule. 44. The method according to any one of claims 35 to 43, Wherein the auxiliary data signal comprises device control data configured to control the device.