Pulse or digital communications – Repeaters – Testing
Patent
1989-11-08
1991-07-23
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
341 76, 341 94, 375 27, 375 34, H04B 1406
Patent
active
050349651
ABSTRACT:
The invention provides a method of encoding data, e.g. video signals at a lower bit rate for use in digital transmission or recording, and a method of decoding to perform inverse transformation of the encoded data. In the coding method, a block having a plurality of input data is used as an encoding unit. The input data in each block are predicted to obtain estimates thereof. Predictive errors, which are the difference between the input data and the estimates, are evaluated, and a maximum and a minimum of the predictive errors, SX and SN, are determined. A predetermined value larger than SX-SN is used as divisor data OU, which is used in dividing the respective input data to obtain remainders E for each block. The remainders E along with information on the predictive errors, i.e., SX, SN, and OU, are encoded and outputted. In the decoding method, information on a range for the predictive errors and the divisor OU are obtained by use of transmitted additional codes. As a result, offsets (multiples of the divisor OU) can be rightly and uniquely determined in the decoding operation, and by adding the offsets to the transmitted remainders E, the input data can be perfectly reproduced.
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Matsushita Electric - Industrial Co., Ltd.
Safourek Benedict V.
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