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1. (WO1997009789) TRANSMITTER AND RECEIVER APPARATUS, METHOD FOR TRANSMITTING AND METHOD FOR RECEIVING AND RECORD CARRIER OBTAINED BY THE METHOD OR THE TRANSMITTER APPARATUS

Pub. No.:    WO/1997/009789    International Application No.:    PCT/IB1996/000890
Publication Date: Mar 13, 1997 International Filing Date: Sep 2, 1996
IPC: G11B 20/14
G11B 20/18
H03M 13/31
H04L 1/00
H04L 25/49
Applicants: PHILIPS ELECTRONICS N.V.
PHILIPS NORDEN AB
Inventors: DENISSEN, Adrianus, Johannes, Maria
TOLHUIZEN, Ludovicus, Marinus, Gerardus, Maria
Title: TRANSMITTER AND RECEIVER APPARATUS, METHOD FOR TRANSMITTING AND METHOD FOR RECEIVING AND RECORD CARRIER OBTAINED BY THE METHOD OR THE TRANSMITTER APPARATUS
Abstract:
A transmitter apparatus for transmitting a digital data signal via a transmission medium (10) comprises error protection encoding means (3) for carrying out an error protection encoding on the digital data signal so as to obtain an error protection encoded digital data signal, and channel encoding means (6) for converting the error protection encoded digital data signal processed into a channel encoded digital data signal. The channel encoded digital data signal is supplied to the transmission medium. The error protection encoding means (3) is adapted to carry out an error protection encoding step on packets of p m-bit digital words in the digital data signal, and for supplying error protection encoded packets (Q) of n m-bit digital words to an output, where n, m and p are integers larger than 1, and n > p. The channel encoding means (6) is adapted to convert the error protection encoded packets of n digital words into converted packets (CP, CP') of digital words to form the channel encoded digital data signal and has generator means (60) for supplying at least fixed auxiliary packet (Qf.1, Qf.2) also having the length of n digital words. The channel encoding means further comprises calculation means (58, 66) for calculating in a Galois field GF(2m) a converted digital word CW¿1? in accordance with the formula DWi + α1.FW1.i + α2.FW2.i + ....., where DWi is the binary value corresponding to the i-th digital word in the packet (Q), FW1.i and FW2.i being the fixed binary values corresponding to the i-th digital word in the first and second fixed auxiliary packet (Qf.1, Qf.2) respectively, and CWi is the binary value of the i-th converted digital word in the converted packet (CP, CP') of digital words, where i is an integer value running from 1 to n.