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    • 1. 发明授权
    • Information recording method, information recording apparatus and
information recording medium
    • 信息记录方法,信息记录装置和信息记录介质
    • US5737481A
    • 1998-04-07
    • US493150
    • 1995-06-21
    • Toyoji GushimaYoshiharu KobayashiRyoji YamaguchiSatoshi KondoKatsuhiko YoshidaShigeru FurumiyaKenji KoishiYoshinari Takemura
    • Toyoji GushimaYoshiharu KobayashiRyoji YamaguchiSatoshi KondoKatsuhiko YoshidaShigeru FurumiyaKenji KoishiYoshinari Takemura
    • G11B7/0037G11B7/09G11B20/10H04N5/77H04N5/85H04N9/804H04N5/911H04N7/64
    • G11B19/044G11B19/042G11B20/10527H04N9/8047G11B2020/1062G11B7/0037G11B7/0946H04N5/772H04N5/85
    • An information recording apparatus for continuously recording information without losing any information even if the apparatus temporarily falls into a recording-disable state owing to the shock externally applied, etc. is provided. A disability detector for detecting the recording-disable state is provided in the information recording apparatus, thereby interrupting the recording operation and the reading operation from the buffer memory under the recording-disable state, and making a coding rate reduction controller instruct a coder to temporarily reduce the coding rate of the input information. A remaining capacity detector is provided for monitoring the remaining capacity in the buffer memory and instructing the coder to temporarily reduce the coding rate of the input information when the remaining capacity becomes a predetermined value or less. As a result, the reduction in the remaining capacity of the buffer memory under the recording-disable state is prevented. When the overflow of the buffer memory is detected, the information after the generation of the overflow is controlled to be overwritten on a part of the data already written into the buffer memory. The variation history of the case where the recording data amount is varied by the coder because of the variation in the coding rate of the input information or the overwriting operation in the buffer memory is controlled to be recorded on the disk as rate variation management information. By dividing the recording area on a disk-shaped information recording medium into an inner circumference and an outer circumference and recording on the outer circumference after the return from the recording-disable state, the recording transfer rate after the return becomes higher.
    • 提供一种用于连续地记录信息而不丢失任何信息的信息记录装置,即使该装置由于外部施加的冲击而暂时处于记录禁止状态等。 在信息记录装置中提供用于检测记录禁止状态的残障检测器,从而在记录禁止状态下从缓冲存储器中断记录操作和读取操作,并使编码率降低控制器指示编码器临时 降低输入信息的编码率。 提供剩余容量检测器,用于监视缓冲存储器中的剩余容量,并指示编码器在剩余容量变为预定值或更小时临时降低输入信息的编码率。 结果,防止在记录禁止状态下缓冲存储器的剩余容量的减少。 当检测到缓冲存储器的溢出时,控制溢出生成之后的信息,以覆盖已经写入缓冲存储器的数据的一部分。 由于输入信息的编码率或缓冲存储器中的重写操作的变化而由编码器改变记录数据量的情况的变化历史被控制为以速率变化管理信息记录在盘上。 通过将盘状信息记录介质上的记录区域划分成内周和外圆,并且在从记录禁止状态返回之后在外圆周上记录,返回之后的记录传送速率​​变高。
    • 8. 发明授权
    • Optical disk system
    • 光盘系统
    • US5400315A
    • 1995-03-21
    • US165560
    • 1993-12-13
    • Kenji KoishiYoshinari TakemuraShigeru Furumiya
    • Kenji KoishiYoshinari TakemuraShigeru Furumiya
    • H04N5/85G11B7/00G11B7/004G11B20/10H04N5/92H04N9/79H04N9/82
    • H04N9/8216H04N9/7904
    • An analog-to-digital converter executes analog-to-digital conversion of a first analog video signal at a predetermined sampling frequency "fs". A time base converter converts a time base of an output signal from the analog-to-digital converter at a predetermined time base conversion frequency "ftci". A digital output signal from the time base converter is converted into a corresponding second analog video signal in response to a clock signal of a frequency corresponding to the frequency "ftci". The second analog video signal is converted into an FM video signal recorded on a video region of an optical disk. A binary audio digital signal is converted into a multi-level form digital audio signal. The binary audio digital signal has a data rate corresponding to the frequency "ftci". The multi-level form digital audio signal has a data rate "ftci/n" and 2.sup.n discrete amplitude levels where "n" denotes a predetermined integer. The multi-level form digital audio signal is converted into a corresponding analog audio signal in response to the clock signal of the frequency corresponding to the frequency "ftci". The analog audio signal is converted into an FM audio signal recorded on an audio region of the optical disk. A data signal generator generates a digital data signal at a data rate "ftci/m" where "m" denotes a predetermined integer. The digital data signal is converted into a corresponding analog data signal in response to the clock signal of the frequency corresponding to the frequency "ftci". The analog data signal is converted into an FM data signal recorded on a data region of the optical disk.
    • 模数转换器以预定的采样频率“fs”执行第一模拟视频信号的模数转换。 时基转换器以预定的时基转换频率“ftci”转换来自模数转换器的输出信号的时基。 响应于与频率“ftci”对应的频率的时钟信号,来自时基转换器的数字输出信号被转换成对应的第二模拟视频信号。 第二模拟视频信号被转换成记录在光盘的视频区域上的FM视频信号。 二进制音频数字信号被转换为多电平形式的数字音频信号。 二进制音频数字信号具有对应于频率“ftci”的数据速率。 多级形式数字音频信号具有数据速率“ftci / n”和2n个离散幅度电平,其中“n”表示预定的整数。 响应于对应于频率“ftci”的频率的时钟信号,多级形式的数字音频信号被转换成相应的模拟音频信号。 模拟音频信号被转换成记录在光盘的音频区域上的FM音频信号。 数据信号发生器以数据速率“ftci / m”生成数字数据信号,其中“m”表示预定的整数。 响应于对应于频率“ftci”的频率的时钟信号,将数字数据信号转换成对应的模拟数据信号。 模拟数据信号被转换成记录在光盘的数据区域上的FM数据信号。
    • 9. 发明授权
    • Method of maximum likelihood decoding and digital information playback
apparatus
    • 最大似然解码方法和数字信息播放装置
    • US5719843A
    • 1998-02-17
    • US668178
    • 1996-06-21
    • Takeshi NakajimaShigeru FurumiyaYoshinari TakemuraKenji Koishi
    • Takeshi NakajimaShigeru FurumiyaYoshinari TakemuraKenji Koishi
    • G11B20/10H03M13/41G11B7/00
    • G11B20/10148G11B20/10009H03M13/41H03M13/4107H03M13/6331H03M13/6343
    • A digital information playback apparatus comprises A/D converter that converts a playback signal into digital data, a maximum likelihood decoder that decodes the quantized data output from the A/D converter to obtain the original digital information, and a timing signal extractor that generates a sampling clock used in the A/D converter, and wherein the maximum likelihood decoder detects the response characteristic of the record/playback system and obtains level fluctuations contained in the playback signal, based on the survival path obtained as a maximum likelihood decoding result, to control the expected multilevel equalized values used in the maximum likelihood decoder, the timing signal extractor obtains level fluctuations, based on the survival path obtained as a maximum likelihood decoding result, and obtains the component of the level fluctuations due to phase shifts of the sampling clock of the VCO to control the phase of the sampling clock of the VCO.
    • 一种数字信息播放装置,包括将重放信号转换为数字数据的A / D转换器,对从A / D转换器输出的量化数据进行解码以获得原始数字信息的最大似然解码器,以及生成 在A / D转换器中使用的采样时钟,其中最大似然解码器基于作为最大似然解码结果获得的生存路径,检测记录/重放系统的响应特性并获得包含在重放信号中的电平波动, 控制在最大似然解码器中使用的期望的多级均衡值,定时信号提取器基于作为最大似然解码结果获得的存活路径获得电平波动,并且获得由于采样时钟的相移引起的电平波动的分量 的VCO来控制VCO的采样时钟的相位。