Excavating
Patent
1984-02-21
1986-10-21
Fleming, Michael R.
Excavating
371 39, G06F 1110
Patent
active
046189556
ABSTRACT:
In digitally encoded data transmission systems such as paging systems using a code word format, such as POCSAG, each code word includes a number of bits collectively termed the cyclic redundancy check bits. In a paging receiver the cyclic redundancy check bits are used to determine if there are errors in the received message code words. If an error is detected then one bit random error correction is generally applied because it has a more acceptable falsing rate compared to say two bit random error correction or four bit burst error correction. However a less acceptable falsing rate correction technique, such as four bit burst error correction, can be given if additional protection against falsing is provided. The additional protection comprises error detection check bits which are included in the entire message transmitted by the base station. At the receiver any errors in the message code words are subjected to four bit burst error correction and thereafter the entire "corrected" message is subjected to a further check using the error detection check bits. Whether or not error detection check bits have been included in the message is indicated by preconditioning the message, for example by using predetermined ones of the plurality of addresses allocated to each pager for different purposes. If error detection check bits have not been included a more acceptable falsing rate correction technique is applied.
REFERENCES:
patent: 4276646 (1981-06-01), Haggard et al.
patent: 4416010 (1983-11-01), Hibino et al.
patent: 4437185 (1984-03-01), Sako et al.
patent: 4477903 (1984-10-01), Schouhamer Immink
patent: 4497058 (1985-01-01), Sako et al.
patent: 4498175 (1985-02-01), Nagumo et al.
patent: 4523323 (1985-06-01), Nakajima et al.
patent: 4525838 (1985-06-01), Patel
Mabey Peter J.
Sharpe Anthony K.
Fleming Michael R.
Treacy David R.
U.S. Philips Corporation
LandOfFree
Digital data transmission system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital data transmission system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital data transmission system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1293362