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17 条记录 (耗时 0.011 秒)

    VARIABLE RATE SPEECH CODEC
    11.
    发明公开
    VARIABLE RATE SPEECH CODEC 审中-公开
    语音编解码器可变速率

    公开(公告)号：EP1556979A1

    公开(公告)日：2005-07-27

    申请号：EP03758176.6

    申请日：2003-10-30

    申请人： Nokia Corporation

    发明人： MÄKINEN, Jari ,  OJALA, Pasi

    IPC分类号： H04L1/00 ,  G10L19/14

    CPC分类号： H04L1/0014 ,  G10L19/24

    摘要： A method for performing variable rate speech coding in the speech codec comprising a plurality of speech codec modes operating at different bit rates, the speech encoded by said speech codec being arranged for transmission in a telecommunications network. Information on an active speech codec mode set to be supported is received from the telecommunications network, in response to which the supported speech codec modes that correspond to the active codec mode set determined in the telecommunications network will be activated. Thereafter, speech signals to be applied to the speech codec are encoded with the activated speech codec modes such that the speech codec mode of the substantially lowest bit rate is adapted to the speech frames comprised by the speech signals such that in view of the channel conditions in the telecommunications network the level of residual error in coding will be substantially minimized at the same time.

    AUDIO ENCODING WITH DIFFERENT CODING MODELS
    15.
    发明公开
    AUDIO ENCODING WITH DIFFERENT CODING MODELS 有权
    不同的代码模型的声音编码

    公开(公告)号：EP1747555A1

    公开(公告)日：2007-01-31

    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.

    CODING OF AUDIO SIGNALS
    16.
    发明公开
    CODING OF AUDIO SIGNALS 审中-公开
    音频信号的编码

    公开(公告)号：EP1735776A1

    公开(公告)日：2006-12-27

    申请号：EP05735286.6

    申请日：2005-04-14

    申请人： Nokia Corporation

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

    IPC分类号： G10L19/00

    CPC分类号： G10L19/24 ,  G10L25/18

    摘要： The invention relates to an encoder (1) comprising an input (1.2) for inputting frames of an audio signal in a frequency band, an analysis filter (1.3) for dividing the frequency band into at least a lower frequency band and a higher frequency band, a first encoding block (1.4.1) for encoding the audio signals of the lower frequency band, a second encoding block (1.4.2) for encoding the audio signals of the higher frequency band, and a mode selector for selecting operating mode for the encoder among at least a first mode and a second mode. In the first mode signals only on the lower frequency band are encoded, and in the second mode signals on both the lower and higher frequency band are encoded. The encoder (1) further comprises a scaler to control the second encoding block (1.4.2) to gradually change the encoding properties of the second encoding block (1.4.2) in connection with a change in the operating mode of the encoder. The invention also relates to a device, a decoder, a method, a module, a computer program product, and a signal.

    摘要翻译： 本发明涉及一种编码器（1），其包括用于输入频带中的音频信号的帧的输入（1.2），用于将频带划分为至少较低频带和较高频带的分析滤波器（1.3） ，用于对较低频带的音频信号进行编码的第一编码块（1.4.1），用于对较高频带的音频信号进行编码的第二编码块（1.4.2）以及用于选择用于较高频带的音频信号的操作模式的模式选择器 编码器在至少第一模式和第二模式之中。 在第一模式中，仅在较低频带上的信号被编码，而在第二模式中，在较低和较高频带上的信号被编码。 编码器（1）还包括缩放器，用于控制第二编码块（1.4.2）以结合编码器的操作模式的改变逐渐改变第二编码块（1.4.2）的编码属性。 本发明还涉及一种装置，解码器，方法，模块，计算机程序产品和信号。