Patent ID: 8275061
Filing Date: 2012-09-25
Classification: G10L

Abstract:
1. A spectrum coding apparatus comprising: an acquisition section that acquires a first spectrum which frequency k is in a band of 0≦k<FL; an acquisition section that acquires a second spectrum which frequency k is in a band of 0≦k<FH; an estimation section that estimates a shape of said second spectrum in a band of FL≦k<FH by the following expression where D(k) in 0≦k<FL is the first spectrum, D(k) in FL≦k<FH is the estimated second spectrum, and T is a pitch coefficient; and a coding section that codes a pitch coefficient minimizing a distortion between the shape of the estimated second spectrum and the shape of said second spectrum in the band of FL≦k<FH, wherein the pitch coefficient minimizing the distortion maximizes the following: wherein S(k) is the second spectrum and D(k) is the estimated second spectrum.