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ENCODER AND DECODER FOR BANDWIDTH COMPRESSION

IP.com Disclosure Number: IPCOM000023578D
Original Publication Date: 1978-Apr-30
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 379K

Publishing Venue

Xerox Disclosure Journal

Abstract

A facsimile engine generally designated by the numeral 10 is connected by way of a bi-directional data lead D to a random access buffer memory 50, The facsimile engine 10 can be any facsimile device. Buffer memory 50 may be a random access semiconductor storage device having a fixed relationship between the number of scan lines of facsimile data and its internal contents, A bi-directiona1 compressed data lead C connects the other side of buffer memory 50 to a shift register device 100, Shift register 100, in turn, interfaces across a transmission lead T with a transmission storage buffer 150 which can be any magnetic or semiconductor memory storage device, The storage device 150 is then connected by way of a coupler 151 to a telephone network for either trans-mission or reception.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

ENCODER AND DECODER FOR
BANDWIDTH COMPRESSION
Michael E~ Wilmer

Proposed Classification
U,S~ Cl, 178/6
Int, Cl, H04n 7/00

A facsimile engine generally designated by the numeral 10 is
connected by way of a bi~directional data lead D to a random
access buffer memory 50, The facsimile engine 10 can be any
facsimile device. Buffer memory 50 may be a random access
semiconductor storage device having a fixed relationship
between the number of scan lines of facsimile data and its
internal contents, A bi~-directiona1 compressed data lead C
connects the other side of buffer memory 50 to a shift
register device 100, Shift register 100, in turn, interfaces
across a transmission lead T with a transmission storage
buffer 150 which can be any magnetic or semiconductor memory
storage device, The storage device 150 is then connected by
way of a coupler 151 to a telephone network for either trans-
mission or reception.

/0

Volume 3 Number 2 March/April 1978 99

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ENCODER AND DECODER FOR BANDWIDTH COMPRESSION (Cont~d)

In addition to the above elements, the shift register 100 is
also connected, in parallel, to a decoder circuit, shown
generally by the numeral 20O~ In the receiving mode, the
function for circuit 200 is to inspect a leader code at the
front of each message sequence received and, on the basis of
that inspection, to identify whether the succeeding data bits
in the shift register 100 are data bits corresp...