Disc-shaped information carrier with two parts having different speed reading

 

(57) Abstract:

The invention relates to the field of optical information recording. Disc-shaped information carrier with the substrate and the information layer contains optically readable marks elementary, with an almost uniform density. The information layer contains a first part suitable for reading from the first reading speed, and a second part suitable for reading from the second speed which is higher than the first speed. The first part of the information layer contains the first version of the audio, such as dual performed on the information layer by the method of conversion based on single-bit excess sample (DSD). The second part of the information layer contains the second version of the same sound, for example six, are made on the information layer by way of conversion using pulse code modulation. The second part of the information layer located farther from the center of the disc-shaped media, than the first part. This reduces the speed range, which should have an optical reading unit for the full and proper reading of the information. 3 C.p. f-crystals, OEM, which contains optically readable marks elementary with an almost uniform density, and referred to the information layer has a first part containing the labels that are to be read with the first reading speed, and the second part containing the labels that are to be read with the second reading speed, which is higher than the first reading speed.

Known optically readable disc-shaped information carrier is a compact disc (CD). Basic label information layer of the CD contain tiny grooves, which are provided along the track in the information layer. The density of labels is determined by the gap existing between tracks, and an interval between the marks on the track. In addition to the standard CD, which may include the audio program lasting about an hour, known KD with high density (KDWP) having an information layer, where the gaps between the tracks, the intervals between the marks on the tracks and the recess is substantially less than the standard CD. Therefore, the amount of information on KDP significantly more than the amount of information on a standard CD. Since the space available on KDP relatively large, infoce first part is suitable, for example, to read with the first reading speed, and the information of the second part is suitable, for example, to read with the second reading speed, which is substantially higher than the first reading speed. The term "speed reading" is understood as the average number of elementary labels need to be read per unit of time, and if KD is also called bit rate. The reading speed of each of the two parts is determined, in particular, properties of information available on each side of the information layer.

The disadvantage of disc-shaped information carrier of the aforementioned type is that the information carrier can be fully read only by the optical reading unit, which has a relatively wide speed range.

The objective of the invention is to provide a disc-shaped information carrier of the aforementioned type, which can be fully read by the reading unit, the speed range is limited to the extent possible.

According to the invention, a disc-shaped information carrier is characterized by the fact that the second part of the information layer is located at a greater rest disc-shaped media is determined by the ratio of speed reading from which information is to be read, to the distance between the information to be read, and the center of the disc-shaped information carrier. As a result, the rotation speed of the information carrier is relatively high when reading information, located closer to the center of the media, and is relatively low when reading information, located near the outer edge of the media. Since the second part of the information layer with a relatively higher second read speed is at a greater distance from the center of the media than the first part of the information layer with a relatively low first speed reading, according to the invention, the difference between the rotation speed when reading the first part and the rotation speed when reading the second part is significantly reduced. As a result, the information carrier according to the invention fully read by the reading unit with the maximum limited speed range of the reader, so the reader unit can be equipped with an optimized driving unit.

Concrete option implementation disc-shaped information carrier according to the invention differs Thu the ISI, different from the first version. In this particular embodiment, in which the available space on the information layer is used in an effective manner, the two parts of the information layer contains two different versions of the same recordings. The user of this media has the ability, for example, two different technical versions of audio recordings, or media suitable for use in two different types of read blocks.

Another variant implementation of the disc-shaped information carrier according to the invention is characterized by the fact that the first version is a two-channel version of the audio, while the second version is a six-channel version of this recording. In the result, the user of the disc-shaped information carrier has a choice between, for example, two-channel playback and six-channel audio playback.

Another option exercise disc-shaped information carrier according to the invention differs in that the first part and the second part is performed on the recording media different from each other ways into heaven part contains, for example, the information converted by the method of pulse-code modulation (PCM) as a result, the recording medium can be used in two different types of read blocks.

One of the embodiments of the disc-shaped information carrier according to the invention differs in that the first part and the second part is executed on the storage media using similar methods of conversion.

The invention is illustrated below with reference to the drawings, in which presents the following:

Fig. 1 - schematic representation of the disc-shaped information carrier corresponding to the invention,

Fig. 2 is a graph of the relationship between the speed of rotation is known of the medium and the distance to the center of the media,

Fig. 3 is a graph of the relationship between the rotation speed of the information carrier according to Fig.1 and the distance to the center of the media.

Disc-shaped information storage device 1 according to the invention, conventionally shown in Fig. 1, contains a disc-shaped transparent substrate 3 made of synthetic resin, which is made of a relatively thin reflective information layer 5, which contains optically readable ELEH the military aside from the information layer 5. Basic label information layer 5 contain tiny grooves, which are made along practically circular track in the information layer 5. Information layer 5 has an almost uniform density, which is determined by the interval between consecutive tracks, and the gap between elementary marks on the track. Information layer 5 is read by an appropriate reader unit, which rotates the information storage device 1 around the axis 9 of rotation passing through the center 7 of the carrier 1 of the information optical beam generated by the reading unit, follows the track of the information layer 5.

As schematically shown in Fig.1, an information layer 5 contains the first part 11 of optically readable labels and the second part 13 of optically readable labels. The first part 11 of the information layer 5 is suitable for reading with the first reading speed, whereas the second part 13 of the information layer 5 is suitable for reading with the second reading speed.

The expression "speed reading" is defined as the number of elementary labels need to be read per unit of time, to achieve faithful reproduction of information, as is I.

As mentioned above, the information storage device 1 rotates around the axis 9 of rotation in the reading process. The speed of rotation is determined by the ratio of the speeds and distance r between the subject to read the information and media center 7 1 information. As a result, the rotation speed is relatively high when reading the information on the site is near the center of the CH (a relatively small value of r) and is relatively low when reading information on a site near the outer edge of the CD (relatively high r value) compared to the case with standard CD with a single constant speed read. In Fig.2 presents a graph of the relationship between the speed of rotation of such a standard CD and the distance r to the center of the CD. The difference between the maximum speedMAXspeed and minimum speedMINrotation relatively great, so that a standard CD can fully be only read by the read unit with a fairly wide speed range.

As shown in Fig.1, the second part 13 of the information layer 5 of the carrier 1 information corresponding to the invention, is at a greater distance from the center 7 of the carrier 1 information than the first part 11 information shall be read the first part 11, and the rotation speed of the carrier 1 information is determined by the ratio of the speeds and distance between the subject to read information and the center 7 of the carrier 1, the difference between the rotation speed of the carrier 1 information when reading the first part 11 and the rotation speed of the carrier 1 information when reading the second part 13 is comparatively small. In Fig.3 presents a graph of the relationship between the rotation speed of the carrier 1 information corresponding to the invention, and the distance r to the center 7 of the carrier 1 information. The difference between the maximum speedMAXspeed and minimum speedMINrotation is much less than shown in Fig.2 the difference between the maximum speedMAXspeed and minimum speedMINrotation for a standard CD. As a result, the carrier 1 can be completely read by the reader unit, which has only a limited range of rotational speeds.

The first part 11 and second part 13 of the information layer 5 contain, for example, the first version and the second version of the same recordings, respectively. The first version corresponds to, for example, two-channel variant of the recordings made on the PE nortrade excessive discretization (DSD), while the second version corresponds to, for example, six-channel variant of the recordings made on the second part 13 by way of conversion on the basis of pulse code modulation (PCM). The user information storage device 1 has, therefore, the choice between the two versions mentioned above audio recording, or information storage device 1 can be read by reading blocks of two different types, i.e., through the reading unit, suitable for reading information converted method of conversion of DSD, and the reading unit, suitable for reading information converted method of conversion PCM.

In the disc-shaped carrier 1 information corresponding to the invention, as described above, the first part 11 is suitable for reading with the first reading speed, while the second part 13 is suitable for reading with the second reading speed, which is substantially higher than the first reading speed. You do not want the first reading rate and a second reading rate was constant or almost constant value. For example, the first reading rate and a second reading rate may be appropriate every one of them average to be placed, for example, not more than 10%.

Disc-shaped information carrier according to this invention, alternatively, may have more than two parts. So the media information corresponding to the invention can have, for example, three parts, the first part is near the center of the medium and has a relatively low speed of reading, the third part is near the outer edge of the medium and has a relatively high reading speed, and the second part is located between the first part and the third part and has a reading speed which is higher than the read speed of the first part, and lower than the read speed of the third part.

The first part 11 of the carrier 1 information in accordance with this invention, as described above, contains the first version of the audio, while the second part 13 contains the second version of the same recording. Note that these two pieces of media information corresponding to the present invention may be arranged otherwise, for example, in a variant, in which the first part contains a version of the first audio and the second version of the second audio clip.

Both parts of the media corresponding to the invention, can be t the soba convert DSD or way to convert PCM.

1. Disc-shaped information carrier with the substrate and an information layer, which contains optically readable marks elementary with an almost uniform density, and referred to the information layer has a first part containing the labels that are to be read with the first reading speed, and the second part containing the labels that are to be read with the second reading speed, which is higher than the first reading speed, characterized in that the second part of the information layer is located at a greater distance from the center of the disc-shaped information carrier, the first part of the information layer, and the first part contains the first version audio and the second part contains the second version of the said recordings, different from the first version.

2. Disc-shaped information carrier under item 1, characterized in that the first version is a dual-channel version of the audio, and the second version is a six-channel version of the audio.

3. Disc-shaped information carrier under item 1 or 2, characterized in that the first part and the second part is performed on the recording media different from each other ways to convert.

what are the storage medium using similar methods of conversion.

 

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