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1.发明授权Method of demodulating a quadphase coded data signal and receiver for carrying out the method 失效解调用于执行该方法的四相编码数据信号和接收器的方法
公开(公告)号：US4292593A
公开(公告)日：1981-09-29
申请号：US053577
申请日：1979-06-29
IPC分类号： G11B20/14 , H03M5/12 , H04L7/00 , H04L25/03 , H04L25/48 , H04L25/49 , H04L27/227 , H03K13/01
CPC分类号： H04L25/4908
摘要： The invention relates to a method of demodulating a quadphase coded data signal and a receiver for carrying out the method. The quadphase code comprises four elementary wave forms, each wave form representing two bits of the original non-coded binary signal. An elementary wave form consists of four half bit intervals, the signal corresponding to the first and the second bit, respectively, being transmitted in the first and the second half bit interval and the signal corresponding to the inverted value of the first and the second bit, respectively, being transmitted in the third and the fourth half bit interval. In a receiver according to the invention such a signal is sampled in each of the four half bit intervals. In principle all information is already available after the sampling operations in the first and the second half bit interval, but by utilizing all four samples a proper protection from noise, interference and zero level shifts is obtained. The receiver determines the difference of the samples taken in the first and the third half bit interval and the difference of the samples taken in the second and the fourth bit interval. A positive difference represents a logic 1, a negative difference a logic 0.
摘要翻译： 本发明涉及一种解调四相编码数据信号的方法和一种用于执行该方法的接收机。 四相码包括四个基本波形，每个波形表示原始非编码二进制信号的两位。 基本波形由四个半位间隔组成，分别对应于第一和第二位的信号在第一和第二半位间隔中发送，并且对应于第一和第二位的反相值的信号 分别在第三和第四半位间隔中发送。 在根据本发明的接收机中，这样的信号在四个半位间隔中的每一个中被采样。 原则上，在第一和第二半位间隔中的采样操作之后，所有信息都已经可用，但是通过利用所有四个采样，获得适当的保护以防止噪声，干扰和零电平移位。 接收器确定在第一和第三半位间隔中采样的采样的差异以及在第二和第四位间隔中取样的差。 正差表示逻辑1，负差为逻辑0。
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公开(公告)号：US4292655A
公开(公告)日：1981-09-29
申请号：US88735
申请日：1979-10-26
CPC分类号： G06F11/187 , H04L7/0083 , H04L7/041
摘要： A system having a medium which presents signal sequences which at least partly consist of binary signal sequences and a device for generating a synchronization signal for synchronizing at least parts of said signal sequence (blocks, words). A binary signal sequence contains a synchronization pattern which consists of (2N+1) groups of codes of m+n bits. A number of (N+1) groups have a code content which exhibits a given, at least minimum Hamming distance with respect to the code (codes) of the other group (groups). The device includes a majority decision device which produces the synchronization signal by means of the n bit codes of said (2N+1) groups on the basis of a majority decision (N+1 out of 2N+1).
摘要翻译： 一种具有介质的系统，其提供至少部分由二进制信号序列组成的信号序列，以及用于产生用于使所述信号序列（块，字）的至少一部分同步的同步信号的装置。 二进制信号序列包含同步模式，其由m + n位的（2N + 1）码组组成。 多个（N + 1）组具有相对于其他组（组）的代码（代码）呈现给定的至少最小汉明距离的代码内容。 该装置包括多数决定装置，其基于多数决定（N + 1之外的2N + 1），通过所述（2N + 1）组的n位代码产生同步信号。
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3.发明授权Optically readable record carrier with track undulations for producing a synchronizing clock signal and apparatus for forming such track 失效具有轨道起伏的光学可读记录载体，用于产生同步时钟信号和用于形成这种轨道的装置
公开(公告)号：US4972401A
公开(公告)日：1990-11-20
申请号：US224085
申请日：1989-01-17
CPC分类号： G11B7/24082 , G11B20/1419 , G11B20/1423 , G11B7/004
摘要： An optically readable record carrier for storing digitally coded information having a power spectrum with a substantially zero level at a predetermined frequency. The information is recorded on and/or reproduced from substantially parallel elongated tracks on the record carrier which have a periodic undulation at the aforesaid predetermined frequency. Such undulation generates a clock signal for synchronizing the recording and/or reproduction of the digitally encoded information on the tracks, and does not interfere with the recording or reproduction of such information. Apparatus is disclosed for forming such tracks on the record carrier.
摘要翻译： 一种光学可读记录载体，用于以预定频率存储具有基本零电平的功率谱的数字编码信息。 信息被记录在记录载体上的基本上平行的细长轨道上和/或从上述预定频率具有周期性波动的再现。 这种波动产生用于使轨道上的数字编码信息的记录和/或再现同步的时钟信号，并且不干扰这种信息的记录或再现。 公开了用于在记录载体上形成这种轨道的装置。
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4.发明授权
公开(公告)号：US4238843A
公开(公告)日：1980-12-09
申请号：US008221
申请日：1979-01-31
IPC分类号： G11B20/10 , G11B7/00 , G11B7/004 , G11B7/0045 , G11B7/007 , G11B20/14 , G11B23/00 , G11B23/30 , G11B23/36 , G11C13/04
CPC分类号： G11B7/00745 , G11B20/1419 , G11B20/1423
摘要： A disc-shaped record carrier having an information track which is divided into a plurality of sectors per track circumference. Each sector is divided into a data section, in which the data can be recorded, and a synchronizing section. This synchronizing section consists of an optically detectable relief structure and comprises an indicator portion and an address portion. The address portion contains the information about the track number and the sector number. The indicator portion serves to define the beginning of the address portion unambiguously and for this purpose has such a relief structure that the indicator signal produced after cooperation with the radiation beam has a frequency which is clearly distinguishable from signal components resulting from the address portion.
摘要翻译： 一种盘形记录载体，其具有信息轨道，每个轨道圆周被划分成多个扇区。 每个扇区被划分成可记录数据的数据部分和同步部分。 该同步部分由光学可检测的浮雕结构组成，并包括指示器部分和地址部分。 地址部分包含关于轨道号和扇区号的信息。 指示器部分用于明确地定义地址部分的开始，并且为此目的具有这样的浮雕结构，即在与辐射束协作之后产生的指示符信号具有与由地址部分产生的信号分量明显区分的频率。
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5.发明授权System for transmitting digital information, coding arrangement for use in that system, decoding arrangement for use in that system and record carrier for use in that system 失效用于发送数字信息的系统，在该系统中使用的编码装置，用于该系统的解码装置和用于该系统的记录载体
公开(公告)号：US4464714A
公开(公告)日：1984-08-07
申请号：US315793
申请日：1981-10-28
IPC分类号： G11B7/00 , G11B7/004 , G11B20/12 , G11B20/14 , H03M5/02 , H03M7/20 , H03M7/22 , H04L25/49 , G06F3/06 , G11B5/09 , H03K13/24
CPC分类号： G11B20/1426 , H04L25/49
摘要： A system for transmitting digital information including a coding arrangement, a transfer medium, for example a record carrier, and a decoding arrangement.In the coding arrangement the digital information is received as groups of input words which are encoded to form code words, each code word corresponding to an input word. Each code word has a time duration equal to s.tau..sub.O and each is assembled from M subgroups G.sub.m of I signal positions t.sub.mi spaced by equal time intervals .tau., where m is a number from 1 to M, inclusive, corresponding to a subgroup G.sub.m and i is a number within each subgroup G.sub.m from 1 to I inclusive. In each subgroup G.sub.m, k of these signal positions t.sub.mi are always occupied by a signal which is distinguishable from the signal in unoccupied positions, where k is an integer smaller than I (1.ltoreq.k.ltoreq.I-1). The first positions of the subgroups G.sub.m are located at mutually different time intervals .epsilon..sub.m from the beginning of the code word, where O.ltoreq..epsilon..sub.m .ltoreq..tau. with the restrictions M.gtoreq.2 and ##EQU1## and the group of code words for which it holds that M=2, I=s=2, k=1,.tau.=.tau..sub.O and .epsilon..sub.2 =.epsilon..sub.1 +1/2.tau. being excepted.
摘要翻译： 一种用于发送包括编码装置，传送介质，例如记录载体和解码装置的数字信息的系统。 在编码装置中，数字信息被接收为被编码以形成代码字的输入字组，每个代码字对应于输入字。 每个码字具有等于sτO的时间长度，并且每个由M个子信元位置t m组合，其中M个子组Gm以相等的时间间隔τ间隔，其中m是从1到M的数字，包括对应于子组Gm和 我是每个子组中的数字，从1到I包括Gm。 在每个子组Gm中，这些信号位置tmi的k总是被与空闲位置的信号区分开的信号占据，其中k是小于I（1≤k≤I-1）的整数。 子组Gm的第一位置位于与代码字开头相邻的不同的时间间隔εm处，其中O =ε/τ与限制M> / = 2和
和组 其中M = 2，I = s = 2，k = 1，tau = tau O和ε2 =ε1 + 1/2 tau的代码字被除外。 -
6.发明授权Apparatus for reproducing digitally coded information recorded on an optically readable disc-shaped record carrier 失效用于再现记录在光学可读的盘形记录载体上的数字编码信息的装置
公开(公告)号：US4326282A
公开(公告)日：1982-04-20
申请号：US132743
申请日：1980-03-24
CPC分类号： G11B20/1423 , G11B20/1419 , G11B7/005
摘要： Disclosed is an apparatus for reproducing digitally coded information recorded on a disc-shaped record carrier in the form of optically detectable, unit information areas arranged in accordance with a concentric or spiral track pattern. The apparatus comprises a filter which is tuned to a frequency f=V/L, V being the nominal tangential speed of the record carrier and L the nominal center-to-center distance of said unit areas. This frequency component has a frequency equal to twice the bit frequency of the coded information and is situated at a zero point of the power spectrum of said information, so that the extracted signal may be employed for the generation of a clock signal.
摘要翻译： 公开了一种用于以光学可检测的单元信息区域的形式再现记录在盘形记录载体上的数字编码信息的设备，该单元信息区域根据同心或螺旋轨迹图案排列。 该装置包括被调谐到频率f = V / L的滤波器，V是记录载体的标称切向速度，L是所述单位区域的标称中心到中心距离。 该频率分量具有等于编码信息的比特频率的两倍的频率，并且位于所述信息的功率谱的零点，使得所提取的信号可用于产生时钟信号。
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7.发明授权公开(公告)号：US06891868B2
公开(公告)日：2005-05-10
申请号：US09851287
申请日：2001-05-08
IPC分类号： H01S5/068 , H01S5/0683 , H01S3/00
CPC分类号： H01S5/0683 , H01S5/06817
摘要： In order to provide a low noise laser beam, a noise reducing feedback network is provided which creates a noise reducing signal and provides that signal to the laser itself. In order to produce the noise reducing signal, the operation of the laser is monitored and the feedback signal is a direct result of this monitoring. Monitoring is accomplished by a fast-forward sense detector, which receives a portion of the laser beam from the operating laser. The output from this fast-forward sense detector is provided to an amplifier which inverts and amplifies the signal. A noise reduction feedback network then receives the amplified signal, appropriately filters this signal, and provides it to the laser itself so as to reduce noise in the laser-beam for the frequency band of importance for reading the recorded data from the optical medium. The noise reduction feedback signal further has sufficiently high impedance so as to not disturb the traditional CW operation of the laser and to avoid interference with the traditional RF modulation of the laser.
摘要翻译： 为了提供低噪声激光束，提供降噪反馈网络，其创建降噪信号并将该信号提供给激光器本身。 为了产生降噪信号，监视激光的操作，反馈信号是该监视的直接结果。 监视是通过快进检测器实现的，该检测器从操作激光器接收激光束的一部分。 来自该快进感测检测器的输出被提供给反相和放大信号的放大器。 然后，降噪反馈网络接收放大的信号，适当地对该信号进行滤波，并将其提供给激光器本身，以便降低对于从光学介质读取记录数据的重要频带的激光束中的噪声。 噪声降低反馈信号进一步具有足够高的阻抗，以便不干扰激光器的传统CW操作并避免干扰传统的激光的RF调制。
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8.发明授权Optical disk tracking and seeking systems specific track formats using wobbled pits 失效光盘跟踪和寻找使用摆动凹坑的特定轨道格式
公开(公告)号：US4879708A
公开(公告)日：1989-11-07
申请号：US147906
申请日：1988-01-25
CPC分类号： G11B7/0938 , G11B7/00745 , G11B7/08517 , G11B7/08541
摘要： An optical disk recording system including a record medium is disclosed for providing an accurate track crossing count and an accurate track following signal. A first embodiment utilizes off-centered wobbled areas located in the headers of the record medium. The high frequency content of a first signal is combined with the low frequency content of a second signal, which is generated using the wobbled areas. In another embodiment, light-reflective discontinuities are provided in the header areas of the record medium. A qualifier and an AGC are utilized in providing a corrected track following signal. In still another embodiment, reflective discontinuities are located in the servo areas of the record medium. In such an embodiment, it is preferred that there is a fixed gain adjustment to a radial push-pull signal. With regard to each of the three aforesaid embodiments, a track following signal is corrected to compensate for aberrations that are caused by a shift of the light beam returned from the record medium surface. In yet another embodiment, the track following signal is generated using only the central aperture or wobble signal. In this embodiment, it is preferred that three pits be utilized in connection with the track following operation. The three pits are provided in two servo bytes of information located in the servo areas. Two of the three bits are wobble pits and the third pit is used in clocking.
摘要翻译： 公开了一种包括记录介质的光盘记录系统，用于提供准确的轨道交叉计数和准确跟踪信号。 第一实施例使用位于记录介质的头部中的偏心摆动区域。 第一信号的高频内容与使用摆动区域产生的第二信号的低频内容组合。 在另一个实施例中，在记录介质的标题区域中提供光反射不连续性。 使用限定符和AGC来提供校正后的跟踪信号。 在另一个实施例中，反射不连续性位于记录介质的伺服区域中。 在这样的实施例中，优选的是对径向推挽信号进行固定增益调整。 对于上述三个实施例中的每一个，对跟踪跟踪信号进行校正，以补偿由从记录介质表面返回的光束的偏移引起的像差。 在另一个实施例中，仅使用中心孔径或摆动信号产生跟踪信号。 在该实施例中，优选地，跟踪跟踪操作结合使用三个凹坑。 三个凹坑位于伺服区域的两个伺服字节的信息中。 三位中的两位是摆动凹坑，第三个凹坑用于计时。
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9.发明授权Optical disk tracking and seeking systems specific track formats using discontinuities 失效光盘跟踪和寻找使用不连续性的特定轨道格式
公开(公告)号：US4879707A
公开(公告)日：1989-11-07
申请号：US148028
申请日：1988-01-25
CPC分类号： G11B7/0938 , G11B7/00745 , G11B7/08517 , G11B7/08541
摘要： An optical disk recording system including a record medium is disclosed for providing an accurate track crossing count and an accurate track following signal. A first embodiment utilizes off-centered wobbled areas located in the headers of the record medium. The high frequency content of a first signal is combined with the low frequency content of a second signal, which is generated using the wobbled areas. In another embodiment, light-reflective discontinuities are provided in the header areas of the record medium. A qualifier and an AGC are utilized in providing a corrected track following signal. In still another embodiment, reflective discontinuities are located in the servo areas of the record medium. In such an embodiment, it is preferred that there be a fixed gain adjustment to a radial push-pull signal. With regard to each of the three aforesaid embodiments, a track following signal is corrected to compensate for aberrations that are caused by a shift of the light beam returned from the record medium surface. In yet another embodiment, the track following signal is generated using only the central aperture or wobble signal. In this embodiment, it is preferred that three pits be utilized in connection with the track following operation. The three pits are provided in two servo bytes of information located in the servo areas. Two of the three pits are wobble pits and the third pit is used in clocking.
摘要翻译： 公开了一种包括记录介质的光盘记录系统，用于提供准确的轨道交叉计数和准确跟踪信号。 第一实施例使用位于记录介质的头部中的偏心摆动区域。 第一信号的高频内容与使用摆动区域产生的第二信号的低频内容组合。 在另一个实施例中，在记录介质的标题区域中提供光反射不连续性。 使用限定符和AGC来提供校正后的跟踪信号。 在另一个实施例中，反射不连续性位于记录介质的伺服区域中。 在这样的实施例中，优选的是对径向推挽信号进行固定增益调整。 对于上述三个实施例中的每一个，对跟踪跟踪信号进行校正，以补偿由从记录介质表面返回的光束的偏移引起的像差。 在另一个实施例中，仅使用中心孔径或摆动信号产生跟踪信号。 在该实施例中，优选地，跟踪跟踪操作结合使用三个凹坑。 三个凹坑位于伺服区域的两个伺服字节的信息中。 三个凹坑中的两个是摆动凹坑，第三个凹坑用于计时。
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公开(公告)号：US4866686A
公开(公告)日：1989-09-12
申请号：US1293
申请日：1987-01-07
申请人： Johannes J. Verboom
发明人： Johannes J. Verboom
CPC分类号： G11B7/24085 , G11B7/08505 , G11B7/24
摘要： The recording surface of an optical record carrier (1) is divided into a succession of first (A) and second (B) annular zones, each including a plurality of substantially concentric information tracks. The tracks in each zone (A) include radially aligned first control words (13) and the tracks in the annular zones (B) include radially aligned second control words (14), the structures of the first and second control words being distinguishable from each other. An optical scanning device projects a beam which as it scans the tracks reads the control words and a detection circuit generates a measurement signal V.sub.m upon each passage of the beam from one zone to another. The measurement signal can be utilized to rapidly address the scanning beam to any of the annular zones.
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