Method and apparatus for digital data transmission and/or recording and playback
First Claim
1. A method of transmitting and/or recording and playing back digital data, comprising the steps of:
- converting input data in input sections to digital signals in corresponding output sections having word lengths which are a function of information density in the corresponding input sections;
assigning the output sections of digital signals to blocks having constant word lengths;
filling the blocks assigned to output sections having word lengths that are less than the constant word lengths of the blocks with portions of the output sections having word lengths which are greater than the constant word lengths of the blocks;
transmitting the blocks, andreconstructing the output sections from the received blocks in their original word lengths.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for the transmission and/or recording and playback of digital data wherein the data are converted in sections to digital signals whose word length is a function of the information density of the data sections which reduces the susceptibility of the data to interference. In accordance with the method the digital signals obtained in sections are initially assigned to blocks having a constant word length, whereupon the blocks whose data sections have a smaller word length than the word length given by the blocks are filled with portions of data sections having a word length greater than the word length given by the blocks and finally the data sections are recombined from the blocks in their original word lengths.
40 Citations
18 Claims
-
1. A method of transmitting and/or recording and playing back digital data, comprising the steps of:
-
converting input data in input sections to digital signals in corresponding output sections having word lengths which are a function of information density in the corresponding input sections; assigning the output sections of digital signals to blocks having constant word lengths; filling the blocks assigned to output sections having word lengths that are less than the constant word lengths of the blocks with portions of the output sections having word lengths which are greater than the constant word lengths of the blocks; transmitting the blocks, and reconstructing the output sections from the received blocks in their original word lengths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 18)
-
-
16. An apparatus for the transmission and/or recording and playback of digital data, comprising:
-
one of a data transmission path and a record carrier, having a source side and a sink side; means for converting the digital data in sections to digital signals having a word length which is a function of information density in the sections; counter means, disposed on said source side, for counting the digital signals; a first memory group and a second memory group, each having a plurality of areas, with each area corresponding to a respective block and having a number of memory locations corresponding to a constant block length of the respective blocks; first multiplexer means for assigning the digital signals counted by said counter to a corresponding one of the areas of said first memory group and, if the word length of the digital signal is greater than the constant word length of the blocks, to one of the areas of said second memory group, such that only end portions of the digital signals having word lengths greater than the constant word length of the blocks are assigned to the areas of said second memory group; first demultiplexer means for combining the digital signals in said first and second memory groups by filling the blocks corresponding to the areas of said first memory group which are assigned digital signals having word lengths which are less than the constant word length of the blocks with the portions of the digital signals in said second memory group; first control circuit means for controlling the flow of the digital signals through said counter, said first multiplexer means, said first and second memory groups and said first demultiplexer so that said first demultiplexer means outputs the digital signals to the source side of said one of a data transmission path and a record carrier; a decoder having an output and being disposed on said sink side, said decoder having means for evaluating the digital signals at the sink side of said one of a data transmission path and a record carrier; a third memory group and a fourth memory group; second multiplexer means, connected to said output of said decoder, for assigning the digital signals to said third and fourth memory groups such that the portions of the digital signals previously assigned to area of said first memory group are assigned to corresponding areas of said third memory group of constant block length and portions of the digital signals previously assigned to said second memory group are assigned to corresponding areas of said fourth memory group; second demultiplexer means for combining the digital signals in said third and fourth memory groups so as to obtain a flow of the digital data in the order of the input data; and second control circuit means for controlling the flow of the digital signals through said decoder, said second multiplexer, said third and fourth memory groups and said second demultiplexer.
-
-
17. An apparatus for the transmission and/or recording and playback of digital data, comprising:
-
means for converting input data in input sections to digital signals in corresponding output sections having word lengths which are a function of information density in the corresponding input sections; means for assigning the output sections of digital signals to blocks having constant word lengths; means for filling the blocks assigned to output sections having word lengths that are less that the word lengths of the blocks with portions of the output sections having word lengths which are greater than the word lengths of the blocks; means for transmitting the blocks; and means for reconstructing the output sections from the blocks, in their original word lengths.
-
Specification