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17 条记录 (耗时 0.012 秒)

    AUDIO ENCODING WITH DIFFERENT CODING FRAME LENGTHS
    3.
    发明公开
    AUDIO ENCODING WITH DIFFERENT CODING FRAME LENGTHS 有权
    不同的代码帧长的声音编码

    公开(公告)号：EP1747554A1

    公开(公告)日：2007-01-31

    申请号：EP04733394.3

    申请日：2004-05-17

    申请人： Nokia Corporation

    发明人： MÄKINEN, Jari

    IPC分类号： G10L19/02

    CPC分类号： G10L19/022 ,  G10L19/20

    摘要： The invention relates to a method for supporting an encoding of an audio signal, wherein at least one section of the audio signal is to be encoded with a coding model that allows the use of different coding frame lengths. In order to enable a simple selection of the respectively best suited coding frame length, it is proposed that at least one control parameter is determined based on signal characteristics of the audio signal. The control parameter is then used for limiting the options of possible coding frame lengths for the at least one section. The invention relates equally to a module 10,11 in which this method is implemented, to a device 1 and a system comprising such a module 10,11, and to a software program product including a software code for realizing the proposed method.

    AUDIO ENCODING WITH DIFFERENT CODING MODELS
    6.
    发明授权
    AUDIO ENCODING WITH DIFFERENT CODING MODELS 有权
    用不同的编码模型编码音频

    公开(公告)号：EP1747555B1

    公开(公告)日：2007-08-29

    申请号：EP04733391.9

    申请日：2004-05-17

    申请人： Nokia Corporation

    发明人： MÄKINEN, Jari ,  LAKANIEMI, Ari ,  OJALA, Pasi

    IPC分类号： G10L19/14

    CPC分类号： G10L19/20

    摘要： The invention relates to a method for supporting an encoding of an audio signal, wherein at least a first and a second coder mode are available for encoding a section of the audio signal. The first coder mode enables a coding based on two different coding models. A selection of a coding model is enabled by a selection rule which is based on signal characteristics which have been determined for a certain analysis window. In order to avoid a misclassification of a section after a switch to the first coder mode, it is proposed that the selection rule is activated only when sufficient sections for the analysis window have been received. The invention relates equally to a module 2,3 in which this method is implemented, to a device 1 and a system comprising such a module 2,3, and to a software program product including a software code for realizing the proposed method.

    摘要翻译： 本发明涉及一种用于支持音频信号的编码的方法，其中至少第一和第二编码器模式可用于对音频信号的一部分进行编码。 第一种编码器模式支持基于两种不同编码模型的编码。 编码模型的选择通过基于已经针对特定分析窗口确定的信号特征的选择规则来实现。 为了避免在切换到第一编码器模式之后对区段进行错误分类，建议仅在已经接收到用于分析窗口的足够区段时激活选择规则。 本发明同样涉及在其中实现该方法的模块2,3，包括这种模块2,3的设备1和系统以及包括用于实现所提出的方法的软件代码的软件程序产品。

    SELECTION OF CODING MODELS FOR ENCODING AN AUDIO SIGNAL
    7.
    发明公开
    SELECTION OF CODING MODELS FOR ENCODING AN AUDIO SIGNAL 有权
    编码模型用于音频信号的编码选择

    公开(公告)号：EP1747442A1

    公开(公告)日：2007-01-31

    申请号：EP05718394.9

    申请日：2005-04-06

    申请人： Nokia Corporation

    发明人： MÄKINEN, Jari

    IPC分类号： G01L19/14

    CPC分类号： G10L19/22 ,  G10L19/20

    摘要： The invention relates to a method of selecting a respective coding model for encoding consecutive sections of an audio signal, wherein at least one coding model optimized for a first type of audio content and at least one coding model optimized for a second type of audio content are available for selection. In general, the coding model is selected for each section based on signal characteristics indicating the type of audio content in the respective section. For some remaining sections, such a selection is not viable, though. For these sections, the selection carried out for respectively neighboring sections is evaluated statistically. The coding model for the remaining sections is then selected based on these statistical evaluations.

    CLASSIFICATION OF AUDIO SIGNALS
    8.
    发明公开
    CLASSIFICATION OF AUDIO SIGNALS 有权
    分类音频信号

    公开(公告)号：EP1719119A1

    公开(公告)日：2006-11-08

    申请号：EP05708203.4

    申请日：2005-02-16

    申请人： Nokia Corporation

    发明人： VAINIO, Janne ,  MIKKOLA, Hannu ,  OJALA, Pasi ,  MÄKINEN, Jari

    IPC分类号： G10L19/14 ,  G10L19/08

    CPC分类号： G10L19/20

    摘要： The invention relates to an encoder (200) comprising an input (201) for inputting frames of an audio signal in a frequency band, at least a first excitation block (206) for performing a first excitation for a speech like audio signal, and a second excitation block (207) for performing a second excitation for a non-speech like audio signal. The encoder (200) further comprises a filter (300) for dividing the frequency band into a plurality of sub bands each having a narrower bandwidth than said frequency band. The encoder (200) also comprises an excitation selection block (203) for selecting one excitation block among said at least first excitation block (206) and said second excitation block (207) for performing the excitation for a frame of the audio signal on the basis of the properties of the audio signal at least at one of said sub bands. The invention also relates to a device, a system, a method and a storage medium for a computer program.

    SUPPORTING A SWITCH BETWEEN AUDIO CODER MODES
    9.
    发明公开
    SUPPORTING A SWITCH BETWEEN AUDIO CODER MODES 有权
    支持音频编码器模式之间的变化

    公开(公告)号：EP1747556A1

    公开(公告)日：2007-01-31

    申请号：EP05718506.8

    申请日：2005-04-15

    申请人： Nokia Corporation

    发明人： OJALA, Pasi ,  MÄKINEN, Jari ,  LAKANIEMI, Ari

    IPC分类号： G10L19/14

    CPC分类号： G10L19/22

    摘要： The invention relates to a method for supporting an encoding of an audio signal, wherein a first coder mode and a second coder mode are available for encoding a respective section of an audio signal. The second coder mode enables a coding of a respective section based on a first coding model, which requires for an encoding of a respective section only information from the section itself, and based on a second coding model, which requires for an encoding of a respective section in addition an overlap signal with information from a preceding section. After a switch from the first coder mode to the second coder mode, always the first coding model is used for encoding a first section of the audio signal. This section can then be employed to generate an artificial overlap signal for a subsequent section, which is possibly to be encoded with the second coding model.

    CODING MODEL SELECTION
    10.
    发明公开
    CODING MODEL SELECTION 审中-公开
    代码模型选择

    公开(公告)号：EP1719120A1

    公开(公告)日：2006-11-08

    申请号：EP05717297.5

    申请日：2005-02-22

    申请人： Nokia Corporation

    发明人： MÄKINEN, Jari

    IPC分类号： G10L19/14 ,  G10L19/08

    CPC分类号： G10L19/22 ,  G10L19/08

    摘要： The invention relates to an encoder (200) comprising an input (201) for inputting frames of an audio signal, a LTP analysis block (209) for performing a LTP analysis of the frames of the audio signal to form LTP parameters on the basis of the properties of the audio signal, and at least a first excitation block (206) for performing a first excitation for frames of the audio signal, and a second excitation block (207) for performing a second excitation for frames of the audio signal. The encoder (200) further comprises a parameter analysis block (202) for analysing said LTP parameters, and an excitation selection block (203) for selecting one excitation block among said first excitation block (206) and said second excitation block (207) for performing the excitation for the frames of the audio signal on the basis of the parameter analysis. The invention also relates to a device, a system, a method, a module and a computer program product.