Patent ID: 8521519
Filing Date: 2013-08-27
Classification: G10L

Abstract:
1. An adaptive excitation vector quantization apparatus that searches for a pitch period in a fixed range for a first subframe of two subframes, the two subframes being provided by dividing a frame, searches for a pitch period in a second subframe in a range determined by a result of comparison between a searched pitch period in a first subframe and a predetermined threshold, and outputs information about the searched pitch periods as quantization data, the apparatus comprising: a first pitch period search processor that searches for a first pitch period in the first subframe by changing resolution with respect to a boundary of the predetermined threshold; a calculation processor that calculates a pitch period search range and a search resolution in the second subframe based on the first pitch period determined in the first subframe and the predetermined threshold; and a second pitch period search processor that searches for a second pitch period in the second subframe by changing resolution based on the search resolution calculated by the calculation processor in the pitch period search range.