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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

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.