Browse Prior Art Database

Method for Burst and Inter-Burst Gap Detection

IP.com Disclosure Number: IPCOM000118777D
Original Publication Date: 1997-Jul-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 4 page(s) / 96K

Publishing Venue

IBM

Related People

Bailey, CE: AUTHOR [+2]

Abstract

Disclosed is a method for detecting the Burst and Inter-Burst Gap (IBG) patterns written on tape. The method measures the distance between peaks, windows the distance to determine if it is a Burst or IBG pattern, and then increments a counter if the pattern is within the window. If the number of counts reaches a threshold, then a pattern detected signal is generated.

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Method for Burst and Inter-Burst Gap Detection

      Disclosed is a method for detecting the Burst and Inter-Burst
Gap (IBG) patterns written on tape.  The method measures the distance
between peaks, windows the distance to determine if it is a Burst or
IBG pattern, and then increments a counter if the pattern is within
the window.  If the number of counts reaches a threshold, then a
pattern detected signal is generated.

      The Burst and IBG detector uses an asynchronous digital
detector to measure the relative location of the peak within a sample
cell which the Burst/IBG detector then uses to reconstruct the length
of the interval between peaks.  Once the interval between peaks is
measured, it is windowed to see if it is a valid burst or IBG
pattern.  If a specified number of windowed patterns is detected,
either a burst detected signal or an IBG detected signal is generated
- depending upon the pattern.

      The conversion of the Detector Peak Arrival Time (PAT)
measurements to interval lengths is shown in Fig. 1.  Every time a
peak is detected, the detector outputs a PAT measurement and a Peak
Detected (PDET) signal.  The Burst/IBG detector takes this value and
stores it in a register (LASTPAT(0:6)).  Next, the Burst/IBG detector
counts the number of clocks until the next PAT measurement arrives
(stored in PATCNT(0:4)).  When it arrives, the Burst/IBG detector
calculates the interval length using the following equation:
  interval length = (1 - LASTPAT(0:6)) + PATCNT(0:4) + DPAT(0:6)

      This method allows the interval measurement to be measured to
within 1/64 of a sample.  For futur...