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公开(公告)号：GB2301729B
公开(公告)日：1999-06-02
申请号：GB9510879
申请日：1995-05-30
Applicant: IBM
Inventor： CHEVION DAN S
Abstract: Recording apparatus is disclosed adapted for connection to a telephone network and to receive voice signals therefrom characterized by an encoder for converting voice signals received from the telephone network into an optically readable image using a predefined code and a printer for printing the optically readable image. Also provided is playback apparatus comprising an optical scanner for producing a digital representation of a document on which is printed an optically readable image, a decoder for converting the optically readable image into audio signals using a predefined code and a transducer for producing a sound corresponding to the audio signals. The recording apparatus and the playback apparatus can be integrated into a single apparatus. In a preferred form of the invention, a device is provided which is adapted for connection to a conventional fax machine to form such recording or playback apparatus in conjunction therewith.
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公开(公告)号：GB2301729A
公开(公告)日：1996-12-11
申请号：GB9510879
申请日：1995-05-30
Applicant: IBM
Inventor： CHEVION DAN S
Abstract: Recording apparatus is disclosed adapted for connection to a telephone network and to receive voice signals therefrom characterised by an encoder for converting voice signals received from the telephone network into an optically readable image using a predefined code and a printer for printing the optically readable image. Also provided is playback apparatus comprising an optical scanner for producing a digital representation of a document on which is printed an optically readable image, a decoder for converting the optically readable image into audio signals using a predefined code and a transducer for producing a sound corresponding to the audio signals. The recording apparatus and the playback apparatus can be integrated into a single apparatus. In a preferred form of the invention, a device is provided which is adapted for connection to a conventional fax machine to form such recording or playback apparatus in conjunction therewith.
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公开(公告)号：CA2019133C
公开(公告)日：1995-05-30
申请号：CA2019133
申请日：1990-06-15
Applicant: IBM
Inventor： CHEVION DAN S , KARNIN EHUD D , WALACH EUGENIUSZ
Abstract: The invention relates to a method for the compression and decompression of binary text images. The method distinguishes between large low-frequency areas and small high-frequency areas in the original frame. For the low-frequency areas, a scheme for lossy compression is used, whereas for the high-frequency areas, a scheme permitting lossless compression is applied. The compression/ decompression process involves the following five stages - (1) prefiltering to remove all black patches (e.g. by removing all black pixels, except where they belong to a large black segment; (2) fast evaluation of compressibility by partitioning the images into mutually exclusive segments and applying different compression modes to each segment; (3) connectivity oriented subsampling to reduce the resolution in horizontal and vertical directions (the image is segmented into blocks, and a 1-pixel representation for each block is determined); (4) lossless compression and decompression where the reduced file is compressed by conventional techniques; and (5) reconstruction by sequence reversal (lossless decompression will retrieve the subsampled file, expansion of the subsampled file through replacement of each pixel by a block having equal value, postfiltering).
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公开(公告)号：CA2019134A1
公开(公告)日：1991-02-04
申请号：CA2019134
申请日：1990-06-15
Applicant: IBM
Inventor： CHEVION DAN S , KARNIN EHUD D , WALACH EUGENIUSZ
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