WO2004114305A1 - Procede d'acces pour format d'enregistrement de donnees audio ou disque optique de donnees sonores - Google Patents

Procede d'acces pour format d'enregistrement de donnees audio ou disque optique de donnees sonores Download PDF

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Publication number
WO2004114305A1
WO2004114305A1 PCT/CN2004/000679 CN2004000679W WO2004114305A1 WO 2004114305 A1 WO2004114305 A1 WO 2004114305A1 CN 2004000679 W CN2004000679 W CN 2004000679W WO 2004114305 A1 WO2004114305 A1 WO 2004114305A1
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WIPO (PCT)
Prior art keywords
data
program
audio
voice
area
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PCT/CN2004/000679
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English (en)
French (fr)
Inventor
Mali Gong
Lei Huang
Longfa Pan
Yuan Yao
Min Lu
Shurong Ma
Original Assignee
Tsinghua University
Chengdu Tosun Science And Technology Development Ltd.
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Application filed by Tsinghua University, Chengdu Tosun Science And Technology Development Ltd. filed Critical Tsinghua University
Publication of WO2004114305A1 publication Critical patent/WO2004114305A1/zh

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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10Digital recording or reproducing
    • G11B20/12Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1217Formatting, e.g. arrangement of data block or words on the record carriers on discs
    • G11B20/1251Formatting, e.g. arrangement of data block or words on the record carriers on discs for continuous data, e.g. digitised analog information signals, pulse code modulated [PCM] data
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10Digital recording or reproducing
    • G11B20/12Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1217Formatting, e.g. arrangement of data block or words on the record carriers on discs
    • G11B2020/1218Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the formatting concerns a specific area of the disc
    • G11B2020/1232Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the formatting concerns a specific area of the disc sector, i.e. the minimal addressable physical data unit

Definitions

  • the present invention relates to an access method for an audio data or voice data optical disc recording format, and belongs to the technical field of optical disc access.
  • Audio and voice digitization that is, digital and analog conversion of sound files. This process consists of sampling and quantization. The lowest frequency that can be heard by the human ear is from 20Hz to the highest frequency of 20KHz, and people above 20KHz. The ear cannot hear, so the maximum bandwidth of audio and speech is 20KHz, so the sampling rate needs to be between 40 ⁇ 50KHz, and more quantization bits are required for each sample.
  • the standard for audio and speech digitization is a signal-to-noise ratio of 16 bits to 96 dB per sample. Linear pulse code modulation is used, and each quantization step has an equal length. This standard is used in the production of audio and speech files.
  • CD-DA Digital Audio
  • WAV files Windows wave
  • MP3 MPEG Layer- 3
  • CD-DA format 44.
  • ⁇ sampling frequency the stereo is left and right channels
  • the total rate is 88K / s, 16 quantization bits, so the music or voice using CD-DA tracks can be Said to be nearly lossless, its sound is basically loyal to the original sound.
  • WAV format is a sound file format developed by Microsoft Corporation, which conforms to RIFF (Resource Interchange File Format) File specification for saving audio and voice information resources of the WI NDOWS platform, supported by the WI NDOWS platform and its applications.
  • the WAV format supports multiple compression algorithms such as MSADPCM, CC ITTA LAW, and multiple audio and speech digits, sampling frequencies, and channels.
  • the standard format WAV file is the same as the CD-DA format, with a sampling frequency of 44.1 KHZ, a rate of 88K / s, and 16 quantization bits. Therefore, the sound file quality of the WAV format is similar to that of CD-DA. Widely used as a sound file format on computers, almost all audio and speech editing software recognizes the WAV format.
  • the existing digital music optical disc is used as a recording medium for recording and reproducing audio data or voice data signals at high density.
  • the optical disc recording format of a digital music disc is shown in FIG. 1. It is composed of a lead-in area, a data area, and a lead-out area.
  • the lead-in area stores a program table (Tab le .f Con t en t, hereinafter referred to as T0C).
  • T0C program table
  • the data area stores users. data.
  • index information in the lead-in area of the disc, which is used to record all the information on the disc.
  • This index information is usually called the program table, and its recording mode is shown in Figure 2.It records all kinds of information of all audio programs or voice programs, including the total number of Information about each program, such as the start address and end address of each audio program or voice program in the disc.
  • the start address, the end address, and the start address information of each audio program or voice program each occupy a sector space.
  • the optical pickup When a CD-DA player is playing, the optical pickup first reads all the information within the specific sector range of the T0C data stored in the lead-in area into the player. Since the information of each audio program or voice program recorded in T0C occupies one sector, as well as the start address and end address sectors, assuming that the total number of user audio programs or voice programs is M, CD-DA is reading When taking T0C information, at least M + 2 sectors must be scanned, which makes CD-DA read T0C information at a slower speed. After the user selects the audio program or voice program to be played, the information of the designated audio program or voice program is found based on the data in the TOC, that is, the start of the designated program is played. Address, move the optical pickup to this starting address, and start playing the program specified by the user.
  • the above-mentioned CD-DA disc recording format can realize audio and voice playback in a computer and an independent CD player.
  • T0C-sectors in the CD-DA disc described above is shown in Figure 2. It can be seen from the figure that the structure of T0C is more complex and occupies multiple sectors. As shown in FIG. 2, because T0C is distributed in the lead-in area of the CD-DA disc and occupies multiple data sectors, the computer or player reads the T0C information at a slower speed.
  • the object of the present invention is to propose a method for accessing the audio data or voice data optical disc recording format.
  • the purpose of fast TOC reading is achieved.
  • the access method of the audio data or voice data optical disc recording format provided by the present invention is to divide the storage medium into a lead-in area, a data area, and a lead-out area, where the lead-in area is blank or information related to the optical disc data is written, and the data area is written.
  • the user data is composed of multiple independent audio programs or voice programs.
  • the description code of each audio program or voice program and the identification code or header code of all audio programs or voice programs are recorded.
  • the identification code is used to identify the position of the program table;
  • the header code is used to describe the total number of all audio programs or voice programs contained in the user data;
  • the description code is used to describe the relevant information of each audio program or voice program, describing
  • the code contains at least one or more of a program serial number, a start address, or an end address of each audio program or voice program.
  • the user data in the data area is audio data, voice data, and data obtained by processing and encrypting the data.
  • the user data is stored in the storage medium with the sector as the smallest addressing unit, and each independent audio program or voice program constituting the user data occupies an integer number of sectors in the storage medium.
  • each independent audio program or voice program constituting the user data occupies an integer number of sectors in the storage medium.
  • the remainder of the last sector of the program is supplemented on the bits so that the program occupies an integer number of sectors in the storage medium.
  • the padding data may also be supplemented on the remaining bits in the last sector of the program, and multiple sectors are supplemented so that The program occupies an integer number of sectors in the storage medium.
  • the access method of the audio data or voice data optical disc recording format can write TOC information in the data area of the optical disc storage medium; for a magnetic disc storage medium, it can write in any sector of the storage medium Enter T0C information.
  • the pickup of the disc storage medium first reads the contents of the TOC into the player.
  • the user finds the information about the specified audio program or voice program based on the T0C information in the player, such as the start address and end address, and starts playing the specified corresponding audio. Show or voice show.
  • the method of the present invention can process various audio data or voice data, audio files or voice files, such as WAV files, MP 3 files, etc., for data stream processing or encryption protection, and process them in a data processing chip of a dedicated player. Restore the original data stream and play the audio and voice signals.
  • FIG. 1 is a schematic diagram of an access method of a data recording format of an existing audio disc or voice disc.
  • FIG. 2 is a schematic diagram of a sector structure in a program table of an audio program or a voice program of a conventional CD-DA disc.
  • FIG. 3 is a schematic diagram of an audio data or voice data optical disc recording format access method proposed by the present invention.
  • FIG. 4 is a schematic diagram of the recording format of TOC in the recording format of the present invention.
  • FIG. 5 is a schematic diagram of a description code format of each audio program or voice program recorded by T0C in the recording format of the present invention.
  • FIG. 6 is a schematic diagram of supplementary filling bits of the remaining bits of the sector of each audio or voice program in the user data.
  • FIGS. 7 and 8 are schematic diagrams of two recording methods of user data, respectively.
  • FIG. 9 is a schematic diagram of an embodiment of an encrypted user data recording method.
  • 1 is a lead-in area
  • 2 is a data area
  • 3 is a lead-out area.
  • the access method of the audio data or voice data optical disc recording format proposed by the present invention is to divide the storage medium into a lead-in area 1, a data area 2 and a lead-out area 3, where the lead-in area 1 may be blank or Information related to the data of the optical disc can be written, and a program table and user data are written in the data area 2.
  • the user data is composed of multiple independent audio programs or voice programs.
  • TOC information is not written in the memory lead-in area, and instead, TOC information is written in the memory data area.
  • the TOC information can be written in any sector of the memory.
  • the pickup of the disk storage When starting an audio program or a voice program, the pickup of the disk storage first reads the information in the TOC into the player. During playback, after the user selects the audio program or voice program to be played, the user can find the relevant information of the specified audio program or voice program according to the T0C information in the player, such as the start address and the end address, and then start playing the designated corresponding program. Audio shows or voice shows.
  • the program table of the foregoing access method one or two of a description code of each audio program or a voice program and identification codes or header codes of all audio programs or voice programs are recorded, as shown in FIG. 4. The shown program table records the identification code, header code, and description code.
  • the identification code is used to identify the position of the program table; the header code is used to describe the total number of all audio programs or voice programs contained in the user data; the description code is used to describe the relevant information of each audio program or voice program, describing The code contains at least one or more of a program serial number, a start address, or an end address of each audio program or voice program, as shown in FIG. 5, where the program serial number, start address, and end address are recorded at the same time.
  • Identification code which sets the first K bytes in T0C as the identification code of T0C.
  • the logo can be generated according to some mapping algorithm according to the content in TOC, and its length K is also specified by the mapping algorithm.
  • a header code and an M byte following the identification code are used as the header code to describe the total number of all audio programs or voice programs contained in the user data; the description code describes the information of all audio programs or voice programs one by one .
  • the information description of each audio program or voice program can be more or less, but it must contain at least the start address or end address of each program.
  • the T0C identification code is K bytes long, the user data has L audio programs or voice programs, and the description code of each program is N bytes, then the actual length of T0C is (N L + K + M) bytes.
  • the mapping algorithm generated by the player design manufacturer can be encrypted by itself, so that the copyright protection of audio data or voice data can be achieved.
  • the identification code is the main judgment and identification criterion of T0C
  • the longer the data bits occupied by the identification code the more accurate the judgment and identification of T0C is, and the smaller the probability of error occurrence is.
  • the longer the identification code the larger the data space occupied, and the larger the occupation of system resources. Therefore, in practical applications, a compromise needs to be made between the occupation of system resources by the identification code and the accuracy of the TOC judgment.
  • the length of the identification code does not exceed 200 bytes.
  • the identification code can be located at the beginning of a sector of a disc storage medium or any other location.
  • the header code described above may be a direct embodiment of all audio, programs, or voice programs contained in the user data, or may be a tube code generated from the total number of programs according to any rule.
  • the length of the header code is unlimited. Generally, the length of the header code does not exceed 200 bytes.
  • the header code is located after the identification code in the disc storage medium or any other location in the same sector as the identification code.
  • the description code described above can be expressed according to a self-defined rule, but each audio program or voice program contains at least the program sequence of each audio program or voice program Number, start address, or end address.
  • the identification code and the header code described above do not have to exist in the TOC of the audio program or the voice program in the disc storage medium, as long as the description code can be searched according to some rules.
  • the description code format of a single audio program or voice program as described above, where the start address and end address of each program can be a logical block address or
  • MS F address or any other value used to describe the sector address.
  • T0C The content of the information stored in T0C has been mentioned before, and its length varies with the number of audio programs or voice programs recorded on the recording medium, that is, the greater the number of audio programs or voice programs L recorded on the disc, the longer the length of T0C The longer.
  • the length of the T0C generally does not exceed the size of the user data area of two sectors (the size of the user data area of each sector is 2 048 bytes). That is, in the case of the existing technology, The number L of audio programs or voice programs stored on the optical disc will not make the length of TOC (N L + K + M) exceed 4 09 6 bytes.
  • the user data in the data area is audio data, voice data, and data after the data is processed and encrypted, such as CD-DA track data, lossless and uncompressed high-quality audio data or voice data, and lossless There are compressed audio data or speech data, lossy and compressed audio data or speech data, and other data capable of audio playback or speech playback, and so on.
  • the user data is stored in the storage medium with the sector as the smallest addressing unit.
  • Each independent audio program or voice program that composes user data occupies an integer number of sectors in the storage medium. As shown in FIG. 6, N sectors start to N + M-1 sectors, and a total of M sectors are required.
  • an audio program or a voice program is continuously accessed in a sector.
  • pad data is added to the remaining bits of the last sector of the program to make the program occupy storage
  • pad data can be supplemented on the remaining bits of the last sector of the program, and multiple sectors can be supplemented to make the program occupy an integer number of sectors in the storage medium.
  • This structure can make the player addressing mode simple, the addressing speed is fast, at the same time it has a very high sector utilization rate, and it is convenient for the hardware implementation of the player.
  • 7 and 8 are schematic diagrams of two recording methods of user data, respectively. Among them, the original sound signal in FIG. 7 is sampled by 16-bit AD, and the word (16-bit) is used as a unit.
  • the word is composed of two bytes.
  • the first byte is the upper 8 bits and the second byte is the low. 8th place.
  • the words are arranged continuously to form a sequential code stream.
  • FIG. 8 illustrates a variation of the user data access method.
  • the access method proposed by the present invention has flexible transformation capabilities, and can perform various transformations on the original data.
  • a word is composed of two bytes, the first byte is the lower 8 bits first, and the second byte is the upper 8 bits last.
  • the words are arranged continuously to form a sequential code stream.
  • FIG. 9 is a schematic diagram of an embodiment of an encrypted user data recording method. Wherein, the encryption function of user data is described. In this embodiment, an encryption bit is added after each word.
  • All the encryption bits of a sector are combined to implement the encryption function.
  • the user data is already encrypted data. Not raw audio data or speech data. Obviously, the use of increased data encryption bits is only one method of encryption.
  • Various other encryption methods such as encryption of various algorithms on the original data, such as watermark encryption method, etc., can also be used for accessing the audio data or voice data of the present invention.

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Description

一种音频数据或语音数据光盘记录格式的存取方法 技术领域
本发明涉及一种音频数据或语音数据光盘记录格式的存取方 法, 属于光盘存取技术领域。
背景技术
声音的存储和再现技术不断更新和完善, 早期的模拟记录方 式采用机械接触式拾音头, 因而不可避免地存在诸如唱片和拾音 头的磨损、 信噪比难以提高、 通道串扰和抖晃等问题。 后来, 数 字音频与语音技术的发展使声音的存储和再现技术得到革命性 的发展。 音频与语音数字化, 也就是要对声音文件进行数、 模转 换, 这个过程由采样和量化构成, 人耳所能听到的声音, 最低的 频率是从 20Hz起一直到最高频率 20KHz, 20KHz以上人耳是听不 到的, 因此音频与语音的最大带宽是 20KHz, 故而采样速率需要 介于 40 ~ 50KHz之间, 而且对每个样本需要更多的量化比特数。 音频与语音数字化的标准是每个样本 16位- 96dB的信噪比,采用 线性脉冲编码调制, 每一量化步长都具有相等的长度。 在音频与 语音文件的制作中, 正是采用这一标准。
音乐光盘( CD - Digital Audio, 以下简称 CD - DA )、 Windows 声音资源文件( Windows Wave, 以下简称 WAV文件)和 MP3 ( MPEG Layer- 3 ) 是目前流行的数字音频与语音标准, 同一首音乐或语 音釆用不同的数字音频与语音标准会具有不同的声音质量和信 息容量大小。 以 CD - DA为例, CD- DA格式是 44. ΙΚΗζ的采样频 率, 立体声为左、 右信道, 总速率 88K/秒, 16 位量化位数, 因 此采用 CD- DA 音轨的音乐或语音可以说是近似无损的, 它的声 音基本上是忠于原声的。 WAV格式是微软公司开发的一种声音文 件格式, 它符合 RIFF ( Resource Interchange File Format ) 文件规范, 用于保存 WI NDOWS 平台的音频与语音信息资源, 被 WI NDOWS平台及其应用程序所支持。 WAV格式支持 MSADPCM、 CC I TT A LAW等多种压缩算法, 支持多种音频与语音位数、 采样频率和 声道。 标准格式的 WAV文件和 CD - DA格式一样, 也是 44. 1 KHZ 的釆样频率, 速率 88K/秒, 16位量化位数, 所以, WAV格式的声 音文件质量和 CD - DA 相差无几, 也是目前计算机上广为流行的 声音文件格式,几乎所有的音频与语音编辑软件都识别 WAV格式。
已有的数字音乐光盘是作为记录介质用于高密度地记录和 再现音频数据或语音数据信号。 数字音乐光盘的光盘记录格式如 图 1所示, 由导入区、 数据区和导出区组成, 其中的导入区存储 节目表 (Tab l e 。f Con t en t , 以下简称 T0C ), 数据区存储用户数 据。
在 CD - DA 盘片中, 为了便于对用户数据所包含的所有的音 频节目或语音节目进行准确快速的定位和读写, 在盘片的导入区 有专用的索引信息, 用于记录盘片上所有的音频节目或语音节目 的信息,这个索引信息通常称为节目表,其记载方式如图 2所示, 记载了所有的音频节目或语音节目的各种信息, 包括音频节目或 语音节目的总数和每个节目的信息, 如每个音频节目或语音节目 在盘片中的起始地址和终止地址。 起始地址、 终止地址以及每一 个音频节目或语音节目的起始地址信息都各占一个扇区空间。 CD - DA播放机进行播放时, 光学拾取头首先将存放在导入区的 T0C 数据的特定扇区范围内的信息全部读入到播放机中。 由于 T0C中 记录的每一个音频节目或语音节目的信息都占一个扇区, 还有起 始地址和终止地址扇区, 因此假设用户音频节目或语音节目的总 数为 M , 则 CD - DA在读取 T0C信息时, 至少要扫描 M+2个扇区, 这就使得 CD - DA读取 T0C信息的速度较慢。 在用户选择所要播 放的音频节目或语音节目后, 再根据这个 T0C中的数据找到该指 定播放的音频节目或语音节目的信息, 即指定播放的节目的起始 地址,将光学拾取头移至此起始地址,开始播放用户指定的节目。 上述 CD - DA的光盘记录格式, 可以在计算机中和独立的 CD 播放器中实现音频与语音的播放。
上面描述的 CD - DA盘片中 T0C—个扇区的结构如图 2所示, 由图可见 T0C的结构比较复杂, 并占据多个扇区。 如图 2所示, 由于 T0C分布在 CD - DA盘片的导入区, 并占据多个数据扇区, 因此计算机或播放机读取 T0C信息时的速度较慢。
发明内容
本发明的目的是提出一种音频数据或语音数据光盘记录格式 的存取方法, 通过改变音频数据或语音数据及其 T0C在盘片上的 光盘记录格式, 达到 T0C快速读取的目的。
本发明提出的音频数据或语音数据光盘记录格式的存取方 法, 是将存储介质区分成导入区、 数据区和导出区, 其中的导入 区空白或写入与光盘数据相关的信息, 数据区写入节目表和用户 数据, 用户数据由多个独立的音频节目或语音节目组成。
上述存取方法的节目表中记录每个音频节目或语音节目的描 述码以及所有音频节目或语音节目的标识码或标头码中的一种 或两种。 其中的标识码用来标识节目表的位置; 标头码用来描述 用户数据所包含的所有的音频节目或语音节目的总数; 描述码用 来描述每个音频节目或语音节目的相关信息, 描述码中至少包含 有每个音频节目或语音节目的节目序号、 起始地址或终止地址中 的一种或多种。
上述存取方法中, 数据区中的用户数据为音频数据、 语音数 据以及对上述数据进行处理和加密后的数据。
上述存取方法中, 用户数据在存储介质中以扇区为最小寻址 单元进行存储, 组成用户数据的每个独立的音频节目或语音节目 占用存储介质中的整数个扇区。 其中, 若某个独立的音频节目或 语音节目不占有整数个扇区, 则在该节目的最后一个扇区的剩余 位上补充填充位数据, 以使该节目 占用存储介质中的整数个扇 区, 还可以在该节目的最后一个扇'区的剩余位上补充填充位数 据,并补充多个扇区, 以使该节目 占用存储介质中的整数个扇区。
本发明提出的音频数据或语音数据光盘记录格式的存取方 法, 对于光盘存储介质, 可以在存储介质的数据区内写入 T0C信 息; 对于磁盘存储介质, 可以在存储介质的任意扇区内写入 T0C 信息。 在开始音频节目或语音节目播放时, 盘式存储介质的拾取 头首先将 T0C中的内容读入播放机中。 播放时, 用户选定所要播 放的音频节目或语音节目后, 根据播放机中的 T0C信息找到指定 播放的音频节目或语音节目的相关信息, 如起始地址和终止地 址, 开始播放指定相应的音频节目或语音节目。 本发明的方 可以把各种音频数据或语音数据, 音频文件或语音文件, 如 WAV 文件、 MP 3 文件等, 进行数据流处理或加密保护, 并在专用播放 机的数据处理芯片中进行处理, 恢复原始数据流, 进行音频与语 音信号的播放。
附图说明
图 1为已有音频光盘或语音光盘的数据记录格式的存取方法 的示意图。
图 2为现有技术的 CD - DA盘片的音频节目或语音节目的节目 表中一个扇区的结构示意图。
图 3为本发明提出的音频数据或语音数据光盘记录格式的存 取方法的示意图。
图 4为本发明记录格式中 T0C的记录格式示意图。
图 5为本发明记录格式中 T0C的记录每个音频节目或语音节 目的描述码格式示意图。
图 6为用户数据中每个音频或语音节目的扇区剩余位补充填 充位示意图。
图 7和图 8分别为用户数据的两种记录方法示意图。 图 9为加密后的用户数据记录方法的一个实施例的示意图。 图 1〜图 9中, 1是导入区, 2是数据区, 3是导出区。
具体实施方式
本发明提出的音频数据或语音数据光盘记录格式的存取方 法, 如图 3所示, 是将存储介质区分成导入区 1、 数据区 2和导 出区 3 , 其中的导入区 1可以空白, 也可以写入与光盘数据相关 的信息, 数据区 2中写入节目表和用户数据, 该用户数据由多个 独立的音频节目或语音节目组成。 如图 3所示, 对于任何盘式存储介盾, 在存储器导入区内不 写入 T0C信息, 取而代之的是在存储器数据区内写入 T0C信息。 其中, 对于磁盘存储器, 可以在存储器的任意扇区内写入 T0C信 息。 在开始音频节目或语音节目播放时, 盘式存储器的拾取头首 先将 T0C中的信息读入播放机中。 播放时, 用户选定所要播放的 音频节目或语音节目后, 根据播放机中的 T0C信息找到指定播放 的音频节目或语音节目的相关信息, 如起始地址和终止地址, 就 可以开始播放指定相应的音频节目或语音节目。 上述存取方法的节目表中记录每个音频节目或语音节目的 描述码以及所有音频节目或语音节目的标识码或标头码中的一 种或两种, 如图 4所示, 图中所示的节目表中记录了标识码、 标 头码和描述码。 其中的标识码用来标识节目表的位置; 标头码用 来描述用户数据所包含的所有的音频节目或语音节目的总数; 描 述码用来描述每个音频节目或语音节目的相关信息, 描述码中至 少包含有每个音频节目或语音节目的节目序号、 起始地址或终止 地址中的一种或多种, 如图 5所示, 其中同时记录了节目序号、 起始地址和终止地址。 有关标识码、 标头码和描述码的具体描述如下: 标识码, 设定 T0C中的前 K个字节为 T0C的标识码。 该标识 码可以根据 T0C中的内容按照某种映射算法生成, 其长度 K也由 映射算法所规定。 标头码和标识码后的某 M个字节作为标头码, 用来描述用户 数据所包含的所有音频节目或语音节目的总数; 描述码, 逐个地描述了所有音频节目或语音节目的信息。 每 个音频节目或语音节目的信息描述可多可少, 但是必须至少包含 有每个节目的起始地址或终止地址。 如上所述, 若 T0C标识码长 为 K个字节, 用户数据共有 L个音频节目或语音节目, 每个节目 的描述码为 N个字节, 则 T0C的实际长度为( N L+K+M )个字节。 如上描述的标识码, 其生成的映射算法可由播放机设计厂家 自行设定加密, 由此可以实现对音频数据或语音数据的版权保 护。 生成标识码的算法越复杂, 则播放机进行 T0C的搜索以及辨 识的过程就越复杂。 由于标识码是 T0C的主要判断识别准则, 标 识码所占数据位越长, 则对 T0C的判断辨识越准确, 发生判错的 概率越小。 但是, 标识码越长, 所占数据空间越大, 对系统资源 的占用越大。 因此在实际应用中, 需要在标识码对系统资源的占 用和 T0C的判断准确性之间取折衷。 通常情况下, 标识码的长度 不会超过 2 0 0字节。 通常, 标识码可以位于盘式存储介质的某个 扇区的起始位置或者任何其他位置。 如上描述的标头码, 既可以是用户数据所包含的所有音频,节 目或语音节目的直接体现, 也可以是根据任意规则、 由节目总数 生成的筒介码。 标头码的长度不限。 通常情况下, 标头码的长度 不会超过 200字节。 通常, 标头码位于盘式存储介质中标识码之 后或者与标识码同一扇区的任何其他位置。 如上描述的描述码, 可以按照自定规则来表达, 但是每个音 频节目或语音节目至少包含每个音频节目或语音节目的节目序 号、 起始地址或终止地址中的一种或多种。 如上描述的标识码和标头码, 在盘式存储介质中音频节目或 语音节目的 T0C中不是必须存在的, 只要保证描述码按照某种规 则可以被搜寻到。 如上描述的单个音频节目或语音节目的描述码格式, 其中, 每个节目的起始地址和终止地址可以是逻辑块地址, 也可以是
MS F地址, 或者其他用来描述扇区地址的任何数值。
T0C存储的信息内容前已述及, 其长度随记录介质上所记录 的音频节目或语音节目的数目多少而不同, 即盘片上记录的音频 节目或语音节目的数目 L越多, 则 T0C的长度就越长。 就现有光 盘存储技术而言, T0C 的长度一般不会超过两个扇区的用户数据 区大小 (每个扇区的用户数据区大小为 2 048字节), 即在现有技 术情况下, 光盘盘片上存储的音频节目或语音节目的数目 L不会 使得 T0 C的长度 ( N L+K+M ) 超过 4 09 6字节。 上述存取方法中, 数据区中的用户数据为音频数据、 语音数 据以及对上述数据进行处理和加密后的数据, 例如 CD - DA 音轨 数据、 无损无压缩高音质音频数据或语音数据、 无损有压缩音频 数据或语音数据、 有损有压缩音频数据或语音数据以及其他能够 实现音频播放或语音播放的数据等等。 上述存取方法中, 用户数据在存储介质中以扇区为最小寻址 单元进行存储。 组成用户数据的每个独立的音频节目或语音节目 占用存储介质中的整数个扇区,如图 6所示, N扇区开始至 N+M - 1 扇区, 共需 M个扇区。 上述存取方法中, 音频节目或语音节目在扇区中连续存取。 若某个独立的音频或语音节目不占有整数个扇区, 则在该节目的 最后一个扇区的剩余位上补充填充位数据, 以使该节目 占用存储 介廣中的整数个扇区, 还可以在该节目的最后一个扇区的剩余位 上补充填充位数据, 并补充多个扇区, 以使该节目 占用存储介质 中的整数个扇区。 这种结构可使播放机寻址方式简单, 寻址速度 快, 同时具有极高的扇区利用率, 且便于播放机的硬件实施。 图 7和图 8分别为用户数据的两种记录方法示意图。 其中, 图 7 中的原始声音信号被 16 位 AD釆样, 以字 ( 16 位) 为单位, 字由两个字节组成, 第一字节是高 8位在前, 第二 字节是低 8位在后。 各字连续排列, 形成顺序码流。 图 8描述了 用户数据存取方法的一种变化形式。 本发明所提出的存取方法具 有灵活的变换能力,可对原始数据进行各种变换。在本实施例中, 字由两个字节组成, 第一字节是低 8位在前, 第二字节是高 8位 在后。 各字连续排列, 形成顺序码流。 图 9为加密后的用户数据记录方法的一个实施例的示意图。 其中, 描述了用户数据的加密功能, 本实施例中采用在每个字后 增加一个加密位的方式, 一个扇区的所有加密位合起来实现加密 的功能, 用户数据已是经过加密的数据, 而非原始音频数据或语 音数据。 显然, 使用增加数据加密位仅仅是加密的一种方法。 采用各 种其他的加密方法, 如对原始数据进行各种算法的加密, 如水纹 加密法等等, 也都可以用于本发明的音频数据或语音数据的存 取。

Claims

权利要求
1、 一种音频数据或语音数据光盘记录格式的存取方法, 其 特征在于, 将存储介质区分成导入区、 数据区和导出区, 其中的 导入区空白或写入与光盘数据相关的信息, 数据区写入节目表和 用户数据, 用户数据由多个独立的音频节目或语音节目组成。
2、 . 如权利要求 1所述的存取方法, 其特征在于, 节目表中 记录每个音频节目或语音节目的描述码以及所有音频节目或语 音节目的标识码或标头码中的一种或两种。
3、 如权利要求 2所述的存取方法, 其特征在于, 其中的标 识码用来标识节目表的位置; 标头码用来描述用户数据所包含的 所有的音频节目或语音节目的总数; 描述码用来描述每个音频节 目或语音节目的相关信息, 描述码中至少包含有每个音频节目或 语音节目的节目序号、 起始地址或终止地址中的一种或多种。
4、 如权利要求 1所述的存取方法, 其特征在于, 所述的数 据区中的用户数据为音频数据、 语音数据以及对上述数据进行处 理和加密后的数据。
5、 如权利要求 1所述的存取方法, 其特征在于, 用户数据 在存储介质中以扇区为最小寻址单元进行存储, 组成用户数据的 每个独立的音频节目或语音节目 占用存储介质中的整数个扇区。
6、 如权利要求 5所述的存取方法, 其特征在于, 若某个独 立的音频节目或语音节目不占有整数个扇区, 则在该节目的最后 一个扇区的剩余位上补充填充位数据, 以使该节目 占用存储介质 中的整数个扇区。
7、 如权利要求 6所述的存取方法, 其特征在于, 在该节目 的最后一个扇区的剩余位上补充填充位数据, 并补充多个扇区, 以使该节目 占用存储介质中的整数个扇区。
PCT/CN2004/000679 2003-06-23 2004-06-23 Procede d'acces pour format d'enregistrement de donnees audio ou disque optique de donnees sonores WO2004114305A1 (fr)

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CN1115076A (zh) * 1994-03-19 1996-01-17 索尼公司 光盘、记录和读取盘上信息的方法和所用装置
WO2002037494A1 (fr) * 2000-11-06 2002-05-10 Sony Corporation Dispositif et procede d'enregistrement, dispositif et procede de reproduction et support de stockage
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CN1115076A (zh) * 1994-03-19 1996-01-17 索尼公司 光盘、记录和读取盘上信息的方法和所用装置
WO2002037494A1 (fr) * 2000-11-06 2002-05-10 Sony Corporation Dispositif et procede d'enregistrement, dispositif et procede de reproduction et support de stockage
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