Dynamic information storage or retrieval – Binary pulse train information signal – Format arrangement processing for auxiliary information
Reexamination Certificate
2000-09-29
2003-12-02
Huber, Paul W. (Department: 2653)
Dynamic information storage or retrieval
Binary pulse train information signal
Format arrangement processing for auxiliary information
C369S124080, C369S275300
Reexamination Certificate
active
06657938
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a data record medium, a recording apparatus, a reproducing apparatus, and a reproducing method that allow addresses corresponding to a high density structure to be displayed.
2. Description of the Related Art
As a record medium on which audio data is digitized and optically recorded, a compact disc (CD) is well known. A CD has a diameter of 12 cm, a track as pitch of 1.6 &mgr;m, and a line velocity of 1.2 m/s. On a CD, digital audio data of up to 74.7 minutes can be recorded. When the track pitch of a CD is as narrow as 1.5 &mgr;m as the narrowest pitch defined in its standard, digital audio data of around 80 minutes can be recorded.
In addition, as a read-only record medium, a CD-ROM of which a CD is applied to a ROM (Read Only Memory) in such a manner that digital data other than digital audio data is pre-recorded to an audio record area of the CD has become common. In the same standard as a CD, digital data of 650 Mbytes or more equivalent to digital audio data of 74.7 minutes can be recorded to a CD-ROM.
Each of a CD and a CD-ROM has a sub code composed of eight channels (P, Q, R, S, T, U, V, and W channels). Time information of digital data that is recorded is placed in 72 bits of the Q channel. The time information is categorized as two types of reproduction elapsed time referred to as absolute time and relative time. The absolute time represents a time period from the beginning of the record area. The relative time represents a time period from the beginning of each music program or each index. Each of the two types of elapsed time is represented as minutes (MIN), seconds (SEC), and frames (FRAME) as time units. In a CD, the time information represents address information of digital data.
Each of the time units “MIN”, “SEC”, and “FRAME” is assigned data of eight bits and represented with a two-digit BCD (Binary Coded Decimal) number. Thus, in a CD and a CD-ROM, “SEC” is represented from “00” to “59” in the BCD notation; “FRAME” is represented from “00” to “74” since one second is equivalent to 75 frames; and “MIN” is represented from “00” to “79” because the recordable time period of digital data corresponding to the CD standard is less than 80 minutes (in other words, in the non-CD standard, “MIN” is represented from “00” to “99” in the BCD notation).
On a CD-ROM, time information (address information) has been recorded to a header portion of main data as well as the Q channel. As with the Q channel, each of “MIN”, “SEC”, and “FRAME” is assigned data of eight bits and represented with a two-digit BCD number.
On a blank write-once-read-many type CD-R (CD-Recordable) disc and a rewritable type CD-RW (CD-Rewritable) disc, record address information referred to as ATIP (Absolute Time In Pre-grooves) is FM-modulated and recorded to guide grooves (pre-grooves) that are wobbled in the radius direction with a sine wave of 22.05 kHz in the format of “MIN”, “SEC”, and “FRAME” in the BCD notation.
As advancement of the pit forming technology and recording and/or reproducing technologies and achievement of short wavelengths of laser light, as with a DVD (Digital Versatile Disc or Digital Video Disc), the storage capacity of record mediums tends to increase. Thus, requirements of high density structures of conventional CD and CD-ROM are becoming strong.
When the record densities of the conventional CD and CD-ROM are doubled, digital data of around 150 minutes can be recorded. When their record densities are quadrupled, digital data of around 300 minutes can be recorded.
However, in the conventional CD and CD-ROM, as was described above, each of “MIN”, “SEC”, and “FRAME” that are time information is represented with a two-digit BCD number. Thus, the time information of the conventional CD-and-CD-POM cannot represent a time exceeding 100 minutes. As a result, the system does not work.
OBJECTS AND SUMMARY OF THE INVENTION
The present invention is made from the above-described point of view. An object of the present invention is to solve a problem of conventional CD and CD-ROM and provide a record medium that allows time information corresponding to a high density structure to be displayed with maintaining the compatibility thereof. In addition, to allow the present invention to be properly applied to a computer, address information of a CD-ROM and ATIP of a CD-R and a CD-RW are represented in the binary notation. Another object of the present invention is to provide a recording apparatus that records such time information to a record medium. A further object of the present invention is to provide a reproducing apparatus that reproduces such time information from a record medium.
To solve the above-described problem, a first aspect of the present invention is a data record medium for recording a digital signal composed of main data and a sub code, the sub code having time information representing reproduction elapsed time, the sub code being recorded in association with the main data, wherein the time information representing the reproduction elapsed time contained in the sub code has a sub code area represented with a binary coded decimal number, a header area for address information that is a part of the main data and that is in synchronization with the time information, and a data area for user data that is received from the outside as a part of the main data, the address information being represented with a binary number.
A second aspect of the present invention is a data record medium on which record address information as a guide for data has been recorded with a binary number, wherein the data record medium has a record area for main data and a sub code corresponding to the record address information, the sub code having time information representing reproduction elapsed time in a binary coded decimal notation in association with the main data.
A third aspect of the present invention is a recording apparatus for recording main data and a sub code to a data record medium, the sub code having time information representing reproduction elapsed time, the sub code being recorded in association with the main data, comprising: means for generating the time information with a binary coded decimal number;
converting means for converting the binary coded decimal number into a decimal number; and recording means for causing said converting means to convert address information contained in the main data and is in synchronization with the time information into a binary number and recording the resultant data along with the time information to the data record medium.
A fourth aspect of the present invention is a data recording apparatus for recording main data and a sub code to a data record medium, the sub code having time information representing reproduction elapsed time, the sub code being recorded in association with the main data, comprising: means for generating address information that is contained in the main data, is in synchronization with the time information, and is represented with a binary number; converting means for converting the binary number into a binary coded decimal number; and recording means for forming a sub code with the time information converted into the binary coded decimal number by said converting means and recording the sub code along with the main data to the data record medium.
A fifth aspect of the present invention is a data recording apparatus for recording data to a data record medium on which record address information for recording data have been formed with a binary number and the record address information has been assigned with guide grooves wobbled at predetermined intervals, comprising: reproducing means for reproducing the record address information from the data record medium; first recoding means for recording time information representing reproduction elapsed time of main data in synchronization with record address information reproduced by said reproducing means with a binary coded decimal number, the time information being in association with the main dat
Inokuchi Tatsuya
Kawahima Tetsuji
Sako Yoichiro
Shishido Yukio
Toyama Katsumi
Huber Paul W.
Maioli Jay H.
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