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公开(公告)号：DE3381771D1
公开(公告)日：1990-09-06
申请号：DE3381771
申请日：1983-01-28
Applicant: IBM
Inventor： TSENG SAMUEL CHIN-CHONG
Abstract: AA character compaction and generation method and apparatus which is particularly adapted to the compaction and generation of complex characters such as Kanji characters. Each character in a complex character set is defined by an I row and J column dot matrix, wherein each row is comprised of J bytes. Each successive row of a given character is scanned from the first through the Jth byte to determine if the current byte being scanned has the same numerical value as the immediately preceding or directly above byte in the scanning sequence. The number of successively read out sequence of bytes that have the same numerical value as the immediately preceding or directly above byte are coded as single symbols words Pn and Am, respectively, where n and m are integers which are indicative of the number of successive bytes scanned in sequence which are equal in numerical value to each immediately preceding or directly above byte. If a current byte being scanned is not of the same numerical value as the previous byte or the above byte, it is coded as a single symbol Sx, where x is an integer which is indicative of its numerical value. Each of the successively generated symbols Pn, Am and Sx for a given complex character are stored as a compacted complex representation thereof.
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公开(公告)号：AU1385183A
公开(公告)日：1984-01-05
申请号：AU1385183
申请日：1983-04-21
Applicant: IBM
Inventor： FLEEK ARTHUR EDWIN , TSENG SAMUEL CHIN-CHONG
Abstract: A variable speed printing (VSP) adaptor for a dot matrix printer includes a monitoring counter (40) which is preset with a number equal to the number of column scans with a dot print line and has a plurality of devices each capable of assuming one of two states, to monitor the state of the pattern data to be printed. The pattern data to be printed is scanned in a forward direction, i.e in the normal printing direction starting at the first print position and the count in the counter is decremented one count for each column data scanned. During the time interval between when this data is latched and the actual hammer actuation, the pattern data is scanned in the backward direction starting at the last print position. Each time the column data for a backward scan is zero, i.e. no dot to be printed, prior to sensing a non-zero column, the count in the counter is decremented one count. The printing operation continues in the interleaved forward/ backward scans until the count in the counter reaches a reference level such as zero. Upon sensing this reference level in the counter, a control signal is generated which indicates that the printing of the dot row is complete and initiates movement of the paper to the next dot row position.
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公开(公告)号：DE2257963A1
公开(公告)日：1973-06-07
申请号：DE2257963
申请日：1972-11-25
Applicant: IBM
Inventor： TSENG SAMUEL CHIN-CHONG
Abstract: A data transmission system for transmitting information over a plurality of channels or for multiplexing different information on a single channel is described. The system includes a transmitting station where input data signals are linearly transformed into a complementary pulse sequence and transmitted to a receiving station wherein the transmitted pulses are inversely transformed to recover the original signals. The recovered signals are larger in amplitude than the original input signals by a factor dependent on the number of information channels in the system. Any noise introduced during transmission is not made larger in amplitude with the result that the signal to noise ratio of the received signals is improved. The input signals are supplied to a plurality of encoding devices at the transmitter. The encoding devices include tapped delay line devices having multipliers at the taps that multiply the tapped signals by a plus or minus factor in accordance with the code. The multiplied signals are then combined to produce a pulse sequence which is transmitted to the receiving station. At the receiving station the pulse sequence is applied to a plurality of decoding devices. The decoding devices include tapped delay line devices having multipliers at the taps which multiply the tapped signals by a plus or minus factor according to a code which is complementary to the code used at the transmitting station. The multiplied signals are then combined to recover the original input signal which is increased in amplitude by a given factor. The system may be embodied in acoustic surface wave structures wherein the encoding and decoding devices are interdigital transducers.
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