公开(公告)号：CA2636848A1

公开(公告)日：2007-08-02

申请号：CA2636848

申请日：2007-01-10

Applicant: IBM

Inventor： HUTCHINS ROBERT ,  JELITTO JENS ,  CHERUBINI GIOVANNI ,  ELEFTHERIOU EVANGELOS

IPC: G11B5/584

Abstract: A fully synchronous longitudinal position (LPOS) detection system is provided for improving the reliability of servo channels in tape systems. The system is based on the interpolation of the servo channel output signal, which is sampled by an analog-to-digital converter (ADC) at a fixed sampling rate, using a clock at a nominal frequency, so that interpolated signal samples are obtained at a predetermined fixed rate, independent of tape velocity. This predetermined fixed rate is defined in terms of samples per unit of length, as opposed to samples per unit of time, which is the measure of the ADC sampling rate. The resolution with which the servo channel signal is obtained at the interpolator output is thus determined by the step interpolation distance.

公开(公告)号：AT442651T

公开(公告)日：2009-09-15

申请号：AT06792475

申请日：2006-07-03

Applicant: IBM

Inventor： ELEFTHERIOU EVANGELOS ,  OELCER SEDAT ,  JAQUETTE GLEN ,  JELITTO JENS ,  HUTCHINS ROBERT

IPC: G11B20/10 ,  H04L25/03

Abstract: A read channel and method using that read channel are disclosed. The read channel comprises an analog to digital converter which asynchronously samples at a fixed rate an analog signal formed by reading a data track, where that data track was written to a data storage medium at a symbol rate and an interpolator interconnected with the analog to digital converter. The read channel further comprises a fractionally-spaced equalizer, where the interpolator provides an interpolated signal to the fractionally-spaced equalizer at an interpolation rate, where that interpolation rate is greater than the symbol rate. The fractionally-spaced equalizer forms a synchronous equalized signal. The read channel further comprises a gain control module interconnected with the fractionally-spaced equalizer, and a sequence detector interconnected with the gain control module.

公开(公告)号：CA2636848C

公开(公告)日：2015-04-28

申请号：CA2636848

申请日：2007-01-10

Applicant: IBM

Inventor： CHERUBINI GIOVANNI ,  ELEFTHERIOU EVANGELOS ,  JELITTO JENS ,  HUTCHINS ROBERT

IPC: G11B5/584

Abstract: A fully synchronous longitudinal position (LPOS) detection system is provided for improving the reliability of servo channels in tape systems. The system is based on the interpolation of the servo channel output signal, which is sampled by an analog-to-digital converter (ADC) at a fixed sampling rate, using a clock at a nominal frequency, so that interpolated signal samples are obtained at a predetermined fixed rate, independent of tape velocity. This predetermined fixed rate is defined in terms of samples per unit of length, as opposed to samples per unit of time, which is the measure of the ADC sampling rate. The resolution with which the servo channel signal is obtained at the interpolator output is thus determined by the step interpolation distance.

公开(公告)号：DE602007001872D1

公开(公告)日：2009-09-17

申请号：DE602007001872

申请日：2007-01-10

Applicant: IBM

Inventor： CHERUBINI GIOVANNI ,  ELEFTHERIOU EVANGELOS ,  JELITTO JENS ,  HUTCHINS ROBERT

IPC: G11B5/584

Abstract: A fully synchronous longitudinal position (LPOS) detection system is provided for improving the reliability of servo channels in tape systems. The system is based on the interpolation of the servo channel output signal, which is sampled by an analog-to-digital converter (ADC) at a fixed sampling rate, using a clock at a nominal frequency, so that interpolated signal samples are obtained at a predetermined fixed rate, independent of tape velocity. This predetermined fixed rate is defined in terms of samples per unit of length, as opposed to samples per unit of time, which is the measure of the ADC sampling rate. The resolution with which the servo channel signal is obtained at the interpolator output is thus determined by the step interpolation distance.

公开(公告)号：AT438912T

公开(公告)日：2009-08-15

申请号：AT07703759

申请日：2007-01-10

Applicant: IBM

Inventor： CHERUBINI GIOVANNI ,  ELEFTHERIOU EVANGELOS ,  JELITTO JENS ,  HUTCHINS ROBERT

IPC: G11B5/584

Abstract: A fully synchronous longitudinal position (LPOS) detection system is provided for improving the reliability of servo channels in tape systems. The system is based on the interpolation of the servo channel output signal, which is sampled by an analog-to-digital converter (ADC) at a fixed sampling rate, using a clock at a nominal frequency, so that interpolated signal samples are obtained at a predetermined fixed rate, independent of tape velocity. This predetermined fixed rate is defined in terms of samples per unit of length, as opposed to samples per unit of time, which is the measure of the ADC sampling rate. The resolution with which the servo channel signal is obtained at the interpolator output is thus determined by the step interpolation distance.