公开(公告)号：EP2101318A4

公开(公告)日：2011-03-16

申请号：EP07850512

申请日：2007-12-12

Applicant: PANASONIC CORP

Inventor： YAMANASHI TOMOFUMI ,  OSHIKIRI MASAHIRO

IPC: G10L19/02 ,  G10L19/038 ,  G10L19/08 ,  G10L19/083 ,  G10L19/24 ,  H03M7/30

CPC classification number: G10L19/0204 ,  G10L19/0212 ,  G10L19/038 ,  G10L19/083 ,  G10L19/24

Abstract: Disclosed are an encoding device and others capable of reducing the encoded information amount, the audio signal encoding error, and the decoded signal audio quality degradation. The device includes: a frequency region conversion unit (101) which converts an inputted audio signal into a frequency region; a band selection unit (102) which selects a quantization object band from a plurality of sub bands obtained by dividing the frequency region; and a shape quantization unit (103) which quantizes the shape of the frequency region parameter of the quantization object band. When a prediction encoding presence/absence judgment unit (104) judges that the number of common sub bands between the quantization object band and the quantization object band selected in the past is not smaller than a predetermined value, a gain quantization unit (105) performs prediction encoding on the gain of the frequency region parameter of the quantization object band. When the number of the common sub bands is smaller than the predetermined value, the gain quantization unit (105) directly quantizes the gain of the frequency region parameter of the quantization object band.

公开(公告)号：EP2017830A4

公开(公告)日：2009-05-27

申请号：EP07743017

申请日：2007-05-09

Applicant: PANASONIC CORP

Inventor： YAMANASHI TOMOFUMI ,  SATO KAORU ,  MORII TOSHIYUKI

IPC: G10L21/02 ,  G10L19/02 ,  G10L21/038 ,  H03M7/30

CPC classification number: G10L19/0208 ,  G10L21/038

Abstract: It is possible to provide an encoding device and an encoding method capable of realizing encoding with a very small information amount and a very small calculation amount when encoding higher-band spectrum data according to lower-band spectrum data in a wide-band signal. The device and the method can obtain a high-quality decoded signal even if a large quantization distortion is caused in the lower-band spectrum data. In this device, when encoding higher-band spectrum data in a signal to be encoded, according to lower-band spectrum data in the signal, only for a part (a head portion) of the higher-band spectrum data, the lower-band spectrum data after being quantized is subjected to approximate partial search and higher-band spectrum data is generated according to the search result.

公开(公告)号：EP1768105A4

公开(公告)日：2009-03-25

申请号：EP05751431

申请日：2005-06-16

Applicant: PANASONIC CORP

Inventor： SATO KAORU ,  MORII TOSHIYUKI ,  YAMANASHI TOMOFUMI

IPC: G10L19/02 ,  G10L19/12 ,  G10L21/04

CPC classification number: G10L19/24 ,  G10L19/12

Abstract: There is disclosed an audio encoding device capable of realizing effective encoding while using audio encoding of the CELP method in an extended layer when hierarchically encoding an audio signal. In this device, a first encoding section (115) subjects an input signal (S11) to audio encoding processing of the CELP method and outputs the obtained first encoded information (S12) to a parameter decoding section (120). The parameter decoding section (120) acquires a first quantization LSP code (L1), a first adaptive excitation lag code (A1), and the like from the first encoded information (S12), obtains a first parameter group (S13) from these codes, and outputs it to a second encoding section (130). The second encoding section (130) subjects the input signal (S11) to a second encoding processing by using the first parameter group (S13) and obtains second encoded information (S14). A multiplexing section (154) multiplexes the first encoded information (S12) with the second encoded information (S14) and outputs them via a transmission path N to a decoding apparatus (150).

Abstract translation: 公开了一种音频编码设备，当对音频信号进行分层编码时，能够在扩展层中使用CELP方法的音频编码的同时实现有效编码。 在该装置中，第一编码单元（115）对输入信号（S11）进行CELP方法的音频编码处理，并将所获得的第一编码信息（S12）输出到参数解码单元（120）。 参数解码单元（120）从第一编码信息（S12）中获取第一量化LSP码（L1），第一自适应声源滞后码（A1）等，从这些参数组中获得第一参数组（S13） 编码，并将其输出到第二编码单元（130）。 第二编码单元（130）通过使用第一参数组（S13）对输入信号（S11）进行第二编码处理并获得第二编码信息（S14）。 复用单元（154）将第一编码信息（S12）与第二编码信息（S14）复用并经由传输路径N将它们输出到解码设备（150）。