公开(公告)号：US20010028521A1

公开(公告)日：2001-10-11

申请号：US09826810

申请日：2001-04-06

申请人： Hewlett-Packard Company

发明人： Robert Philip Morling ,  Andrew Hana

IPC分类号： G11B005/09

CPC分类号： G11B20/10 ,  G11B5/00813 ,  G11B5/0086 ,  G11B5/09 ,  G11B20/1201 ,  G11B2220/916

摘要： A method of encoding a digital data stream for writing to a digital storage (DDS) format tape data storage medium, comprises writing a byte stream to a preamble region, immediately preceding a user data region, said byte stream having a characteristic of having a power spectrum (900) substantially similar to a power spectrum of said user data region. An automatic gain control circuit (504) responds to the preamble data stream in a substantially similar fashion to its response to the user data stream. The disclosure may overcome a problem in read channels detecting prior art DDS-1 to DDS-4 format preamble regions in that an automatic gain control circuit of the read channel responds differently to a cyclical preamble region in the known DDS formats, compared with its response to user data, giving rise to increased bit error rate in a sequence detector device of the read channel.

摘要翻译： 一种对数字数据流进行编码以对数字存储（DDS）格式磁带数据存储介质进行编码的方法，包括：在紧接用户数据区之前将字节流写入前导码区域，所述字节流具有功率的特性 频谱（900）基本上类似于所述用户数据区域的功率谱。 自动增益控制电路（504）以与其对用户数据流的响应基本相似的方式对前导码数据流进行响应。 本公开可以克服在检测现有技术DDS-1至DDS-4格式前同步码区域的读取通道中的问题，因为读取信道的自动增益控制电路与已知DDS格式的循环前导码区域的响应不同，与其响应 到用户数据，导致读取通道的序列检测器设备中的比特错误率增加。

公开(公告)号：US20040141247A1

公开(公告)日：2004-07-22

申请号：US10754617

申请日：2004-01-12

申请人： HEWLETT PACKARD COMPANY

发明人： Robert Philip Morling ,  Andrew Hana

IPC分类号： G11B005/09

CPC分类号： G11B20/1201 ,  G11B5/00813 ,  G11B5/0086 ,  G11B5/09 ,  G11B20/10 ,  G11B20/12 ,  G11B2220/916

摘要： A magnetic tape includes plural diagonal tracks, each storing a preamble sequence close to user data such that a transducer for reading the track reads the preamble sequence immediately before reading the user data. The preamble sequence is such that when the track is read by the transducer the preamble sequence has a power sequence with a power spectrum substantially equivalent to the power spectrum of the user data. An AGC circuit responds to the transducer.

摘要翻译： 磁带包括多个对角线轨道，每条轨道存储接近用户数据的前导序列，使得用于读取轨道的换能器在读取用户数据之前立即读取前导序列。 前导码序列使得当音轨由换能器读取时，前导码序列具有功率谱，功率谱基本上等于用户数据的功率谱。 AGC电路响应传感器。