The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 30, 1988
Filed:
Mar. 23, 1987
Anthony K Sharpe, Teversham, GB;
Andrew D McPherson, Cambridge, GB;
U.S. Philips Corp., New York, NY (US);
Abstract
A pager decoding system which is suitable for use with signal formats, such as POCSAG, in which code words are sent in batches, each batch containing a synchronization code word and (n-1) address/message code words, n being the number of code words in a batch, each code word comprising m bits. The pager is able to detect or regain synchronization code word when the carrier signal is lost due to fading. When synchronization is lost input data received by the pager is combed through by switching-on the pager for a duration of m bits at intervals corresponding to (n+1) code words. The data received is stored in a shift register having m stages and in which a synchronization code word can be assembled within two batch periods. Once the synchronization code word has been detected the pager can be switched to a normal data receive mode. In another fade recovery mode the (m-1)th, mth, and (m+1)th bit positions every nth code word are searched to see if a preamble or synchronization code word is present. If none is detected after a predetermined number of batches has been searched then the pager assumes the loss of synchronization mode described above.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile