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:
Feb. 03, 2004
Filed:
Jun. 16, 1999
Matti Sydänmaa, Tampere, FI;
Mauri Väänänen, Tampere, FI;
Aki Mäkivirta, Lapinlahti, FI;
Nokia OYJ, Espoo, FI;
Abstract
A digital audio receiver stores received frames temporarily for decoding and error concealment. A reconstructing block ( ) in the decoder reads stored frames using a read window ( ) wherein the latest received frame (+cnnxt) is undecoded. Decoding is carried out in stages so that the correctness of the current frame ( ) is examined and possible errors are concealed using corresponding data of other frames in the window. Detection of errors is based on checksums ( ) and allowed values of bit combinations in certain parts of the frame. In addition, the receiver maintains an estimate ( ) for the signal's bit error ratio and uses it to control the operation of the error concealment algorithm.