公开(公告)号：US20180114535A1

公开(公告)日：2018-04-26

申请号：US15848841

申请日：2017-12-20

Applicant: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA

Inventor： Takuya KAWASHIMA ,  Masahiro OSHIKIRI

IPC: G10L19/02 ,  G10L19/032 ,  G10L19/002

CPC classification number: G10L19/0204 ,  G10L19/002 ,  G10L19/02 ,  G10L19/0212 ,  G10L19/032 ,  G10L19/24 ,  G10L21/038

Abstract: A speech/audio decoding apparatus is provided that includes a receiver that receives encoded data including a limited-band mode flag, and a memory that stores information on a position of a maximum amplitude spectrum frequency of a previous frame in a divided band. The speech/audio decoding apparatus also includes a processor that identifies whether a decoding band is encoded using a limited-band mode based on the decoded limited-band mode flag. Additionally, the processor decodes the spectrum in a limited band within each of the divided bands in a current frame using the stored information. Furthermore, the limited-band mode is set at an encoder side, when a difference between a first frequency with a first maximum amplitude in a spectrum of the divided band in a preceding frame and a second frequency with a second maximum amplitude in a spectrum of the divided band in the current frame is below a threshold.

公开(公告)号：US20160379654A1

公开(公告)日：2016-12-29

申请号：US15263534

申请日：2016-09-13

Applicant: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA

Inventor： Takuya KAWASHIMA ,  Masahiro OSHIKIRI

IPC: G10L19/02 ,  G10L21/0388

CPC classification number: G10L19/0204 ,  G10L19/0208 ,  G10L19/0212 ,  G10L21/0388 ,  G10L25/06

Abstract: A coding apparatus, including a memory and a processor that, when executing instructions stored in the memory, performs operations including encoding low-band transform coefficients in a first band and calculating, for each extension-band subband obtained by splitting an extension band, a threshold amplitude based on an analysis of statistics on extension-band transform coefficients included in the subband. The processor further compares, for each of the extension-band subbands, an amplitude of the extension-band transform coefficients with the threshold amplitude to extract a representative transform coefficient, updates, when a number of the extracted representative transform coefficients is less than a predetermined number, the threshold amplitude, performs processing to again extract a transform coefficient using the updated threshold amplitude, calculates, for each of the extension-band subbands, a value of correlation between the representative transform coefficient and a normalized encoded low-band transform coefficient.

Abstract translation: 一种编码装置，包括存储器和处理器，当执行存储在存储器中的指令时，执行包括编码第一频带中的低频带变换系数的操作，并且对于通过分割扩展频带而获得的每个扩展频带子带， 基于包括在子带中的扩展带变换系数的统计分析的阈值幅度。 处理器进一步比较每个扩展频带子频带具有阈值振幅的扩展频带变换系数的振幅，以提取代表性变换系数，当提取的代表变换系数的数量小于预定值时，更新 数字阈值幅度进行处理以再次提取使用更新的阈值幅度的变换系数，对于每个扩展频带子带计算代表变换系数与归一化编码低频带变换系数之间的相关值。