Browse Prior Art Database

Error Recovery Channel

IP.com Disclosure Number: IPCOM000118491D
Original Publication Date: 1997-Feb-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Hutchins, RA: AUTHOR

Abstract

The error recovery channel is a method to reduce the error rate of a removable storage device by post-processing the data. In this methodology, the storage device recovers data from a channel two ways: first, data is serially processed through a nominal channel in a streaming mode. This maintains a high data rate but may introduce errors if the system reliability is low. Second, data is sampled with an A/D converter and placed in a buffer or RAM. If the nominal channel error rate is too high, signal processing algorithms are applied to the data stored in the buffer to try to recover the data.

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Error Recovery Channel

      The error recovery channel is a method to reduce the error rate
of a removable storage device by post-processing the data.  In this
methodology, the storage device recovers data from a channel two
ways: first, data is serially processed through a nominal channel in
a streaming mode.  This maintains a high data rate but may introduce
errors if the system reliability is low.  Second, data is sampled
with an A/D converter and placed in a buffer or RAM.  If the nominal
channel error rate is too high, signal processing algorithms are
applied to the  data stored in the buffer to try to recover the data.

      The Error Recovery Channel Architecture (ERC) in the Figure is
shown for a multi-channel system with n channels.  It consists of a
set of buffers interfaced to each serial digital read detect channel
and to a microprocessor based system.

      A simple method to improve the performance of a system without
paying a high price in hardware and development is described below.
The technique, called the Error Recovery Channel (ERC), is shown in
the Figure.  It consists of two components:
  1.  a nominal digital channel used to process the data in a
       streaming mode, and
  2.  a set of buffers interfaced to a microprocessor that
       process channel data samples in a non-real time mode
       when a permanent error situation occurs.

      The operation of the ERC is very simple.  In the streaming
m...