H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/81
H04L 5/14 (2006.01) G11B 5/09 (2006.01) G11B 20/12 (2006.01) G11B 20/14 (2006.01) G11B 27/10 (2006.01) G11B 27/32 (2006.01) G11B 27/34 (2006.01) H04J 3/16 (2006.01) H04L 7/04 (2006.01)
Patent
CA 2033613
PHN 13.209 23.05.1990 ABSTRACT: Digital transmission system, transmitter and receiver to be utilised in the transmission system and record carrier obtained by means of the transmitter in the form of a recording means. A digital transmission system comprising a transmitter (3, 5, 7, 8) and a receiver (14, 15, 16, 18). The medium (6) comprises an information channel (T1, T2, ..., Tn) and an auxiliary channel (Tn+1). Through the information channel information is transmitted, for example a digital audio signal. Through the auxiliary channel an auxiliary signal is transmitted. This auxiliary signal comprises sync information (100, 101, 102, 103, 104, 105) and additional information (106). The auxiliary signal is composed of successive blocXs (..., Bn-1, Bn, Bn+1, ...). A first block (Bn) comprises a first block section (header) and a second block section (body). The first block qection of the block (Bn) contains a sync word (101) and a first codeword (102), in this order. The first block section of the second directly successive block (Bn+1) contains a sync word (104) and a second codeword (105), in this order. The first codeword (102) expresses that the second block section t106) of the first block (Bn) contains additional information. If there is also additional information in the second block section (107) of the second block, the two codewords are equal. If the block section (107) does not contain additional information, the two codewords are unequal. The first block section of the first block (Bn) further contains a third codeword (100), the sync word (101) and the first codeword (102), in this order. The first block section of the second block (Bn+1) further contains a fourth codeword (103), a sync word (104) and a second codeword (105), in this order. The fourth codeword also expresses that additional information is contained in the second block section (106) of the first block (Bn). The third codeword is now equal to the fourth codeword if the second block section of the block (Bn-1) directly pxeceding the first block (Bn) also contains additional information. The two codewords are unequal if the second block section of this block (Bn-1) does not contain additional information. (Fig. 2).
Arts Petrus Henricus Maria
Lokhoff Gerardus Cornelius Petrus
Van Eijck Gustavus Lambertus Petrus
Fetherstonhaugh & Co.
Philips Electronics N.v.
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