US 4,398,292 A · Method and apparatus for encoding digital with two error correcting codes

Abstract

Successive data words are distributed to a plurality of respective channels to form successive data blocks, each data block being comprised of the data words in the plural channels. A first error correcting code is generated as a function of the words included in the data block, this first error correcting code being adapted for use in correcting at least one word which may be erroneous in the data block, as when the data block subsequently is received or reproduced. The data words included in the data block are selectively delayed, by different respective time delays, to form a time-interleaved data block comprised of time-interleaved data words. A second error correcting code is generated as a function of the words included in the time-interleaved data block, this second error correcting code being adapted for use in correcting at least one word which may be erroneous in the time-interleaved data block, as when the time-interleaved data block subsequently is received or reproduced. The first and second error correcting codes and the time-interleaved data block are combined to form a transmission block which may be transmitted or recorded on a suitable record medium.

Claims25

Dependent claims

A method of transmitting digital data words, comprising the steps of distributing successive data words to a plurality of respective channels to form successive data blocks, each data block being comprised of the data words in said plural channels;

generating a first error correcting code as a function of at least the words included in said data block, said first error correcting code being adapted for use in correcting at least one word which is erroneous in said data block;
selectively delaying, by different respective time delays, the data words included in said data block to form a time-interleaved data block comprised of time-interleaved data words;
generating a second error correcting code as a function of at least the words included in said time-interleaved data block, said second error correcting code being adapted for use in correcting at least one word which is erroneous in said time-interleaved data block;
and combining said first error correcting code, said second error correcting code and said time-interleaved data block to form a transmission block.

1 more element

An error-correction encoder for successive PCM words supplied thereto, comprising a plurality of channels;

distributing means for distributing successive PCM words to respective ones of said plurality of channels to form successive data blocks, each data block being comprised of the PCM words in said plural channels, first error correcting code means supplied with the PCM words in a data block from said distributed means for generating a first error correcting code as a function of the words included in said data block, said first error correcting code being adapted for use in correcting at least one word which is erroneous in said data block;
delay means coupled to receive the PCM words in a data block from said distributing means for selectively delaying, by different respective time delays, said PCM words to form a time-interleaved data block comprised of time-interleaved PCM words;
second error correcting code means supplied with said time-interleaved PCM words from said delay means in a time-interleaved data block for generating a second error correcting code as a function of said time-interleaved PCM words, said second error correcting code being adapted for use in correcting at least one word which is erroneous in said time-interleaved data block;
and means for combining said first error correcting code, said second error correcting code and said time-interleaved data block to form a transmission block.

1 more element

Dependencies are inferred from the claim text.

Method and apparatus for encoding digital with two error correcting codes

Life of this patent

Method and apparatus for encoding digital with two error correcting codes

Life of this patent

Abstract

Claims25