公开(公告)号：CA2889942C

公开(公告)日：2019-09-17

申请号：CA2889942

申请日：2013-11-01

Applicant: PANASONIC IP CORP AMERICA

Inventor： KAWASHIMA TAKUYA ,  OSHIKIRI MASAHIRO

IPC: G10L19/032 ,  G10L19/035

Abstract: By the present invention, the number of encoding bits allocated to encoding of extended-band spectrum is reduced while degradation of sound quality in the extended band is suppressed. A band compression unit (105) creates combinations of sub-band spectra in pairs of two samples each in order from a low-range side in a band compression target sub-band, selects a spectrum having a large absolute-value amplitude among the combinations, and arranges the selected spectrum close to the low-range side on a frequency axis. A number-of-units recalculation unit (106) redistributes bits saved in the sub-band for which band compression was performed to a low range outside the extended band, and redistributes the number of units on the basis of the redistributed bits.

公开(公告)号：CA2889942A1

公开(公告)日：2014-05-08

申请号：CA2889942

申请日：2013-11-01

Applicant: PANASONIC IP CORP AMERICA

Inventor： KAWASHIMA TAKUYA ,  OSHIKIRI MASAHIRO

IPC: G10L19/032 ,  G10L19/035

Abstract: By the present invention, the number of encoding bits allocated to encoding of extended-band spectrum is reduced while degradation of sound quality in the extended band is suppressed. A band compression unit (105) creates combinations of sub-band spectra in pairs of two samples each in order from a low-range side in a band compression target sub-band, selects a spectrum having a large absolute-value amplitude among the combinations, and arranges the selected spectrum close to the low-range side on a frequency axis. A number-of-units recalculation unit (106) redistributes bits saved in the sub-band for which band compression was performed to a low range outside the extended band, and redistributes the number of units on the basis of the redistributed bits.

公开(公告)号：EP2916318A4

公开(公告)日：2015-12-09

申请号：EP13850858

申请日：2013-11-01

Applicant: PANASONIC IP CORP AMERICA

Inventor： KAWASHIMA TAKUYA ,  OSHIKIRI MASAHIRO

IPC: G10L19/02 ,  G10L19/002 ,  G10L19/032 ,  G10L19/24 ,  G10L21/038

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

Abstract: By the present invention, the number of encoding bits allocated to encoding of extended-band spectrum is reduced while degradation of sound quality in the extended band is suppressed. A band compression unit (105) creates combinations of sub-band spectra in pairs of two samples each in order from a low-range side in a band compression target sub-band, selects a spectrum having a large absolute-value amplitude among the combinations, and arranges the selected spectrum close to the low-range side on a frequency axis. A number-of-units recalculation unit (106) redistributes bits saved in the sub-band for which band compression was performed to a low range outside the extended band, and redistributes the number of units on the basis of the redistributed bits.

Abstract translation: 通过本发明，减少了分配给扩展频带频谱编码的编码比特数，同时抑制了扩展频带中的声音质量下降。 频带压缩单元（105）从频带压缩目标子频带中的低范围侧按顺序创建两个采样对中的子频带频谱的组合，选择组合中绝对值大幅度大的频谱 ，并将选择的频谱在频率轴上靠近低范围侧布置。 单元重新计算单元（106）将保存在进行频带压缩的子带中的比特重新分配到扩展频带之外的低范围，并且基于再分配比特重新分配单元数。

公开(公告)号：EP3174050A4

公开(公告)日：2017-05-31

申请号：EP15824312

申请日：2015-07-03

Applicant: PANASONIC IP CORP AMERICA

Inventor： KAWASHIMA TAKUYA ,  EHARA HIROYUKI

IPC: G10L19/02 ,  G10L19/002 ,  G10L19/032 ,  G10L19/035

CPC classification number: G10L19/002 ,  G10L19/0204 ,  G10L19/0208 ,  G10L19/032 ,  G10L19/035

Abstract: An audio signal coding apparatus (100) includes a time-frequency transformer (101) that outputs sub-band spectra from an input signal, a sub-band energy quantizer (102), a tonality calculator (103) that analyzes tonality of the sub-band spectra, a bit allocator (104) that selects a second sub-band on which quantization is performed by a second quantizer on the basis of the analysis result of the tonality and quantized sub-band energy, and determines a first number of bits to be allocated to a first sub-band on which quantization is performed by a first quantizer, the first quantizer (106) that performs coding using the first number of bits, the second quantizer (107) that performs coding using a pitch filter, and a multiplexer (108).

Abstract translation: 一种音频信号编码装置（100），包括：时间 - 频率变换器（101），从输入信号的没有输出子带光谱，一个子带能量量化器（102），一个音调计算器（103）做了分析的分音调 带光谱，（104）做了位分配器选择在哪个量化由第二量化器进行的色调和量化子带能量的分析结果的基础上的第二子带，和bestimmt比特的firstNumber 将被分配到其上的量化由第一量化器执行的第一子带，所述第一量化器（106）没有进行使用的比特的firstNumber，第二量化器（107）确实执行使用音调滤波器编码编码，并 复用器（108）。

公开(公告)号：EP2772913A4

公开(公告)日：2015-05-06

申请号：EP12843823

申请日：2012-10-12

Applicant: PANASONIC IP CORP AMERICA

Inventor： KAWASHIMA TAKUYA ,  OSHIKIRI MASAHIRO

IPC: G10L19/02 ,  G10L21/0388 ,  H03M7/30

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

Abstract: Provided is an encoding apparatus. A threshold value calculating unit (32) calculates a threshold value from a statistical amount of conversion factors of an extended band. A representative conversion factor extracting unit (33) uses the calculated threshold value to extract conversion factors having large amplitudes. If the number of extracted conversion factors does not reach a specified number, the threshold value calculating unit (32) determines, in accordance with a lacking number of conversion factors, an amount by which the threshold value should be lowered, and modifies the threshold value accordingly. The representative conversion factor extracting unit (33) uses the threshold value, which has been modified, to extract conversion factors. Such threshold value modification by the threshold value difference calculating unit (32) and such conversion factor extraction by the representative conversion factor extracting unit (33) are repeated until the number of extracted conversion factors reaches the specified number.

公开(公告)号：EP3113181A4

公开(公告)日：2017-03-08

申请号：EP15756036

申请日：2015-02-06

Applicant: PANASONIC IP CORP AMERICA

Inventor： KAWASHIMA TAKUYA ,  EHARA HIROYUKI

IPC: G10L19/028 ,  G10L19/02 ,  G10L21/038

CPC classification number: G10L19/028 ,  G10L19/26