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公开(公告)号：EP1700293A1
公开(公告)日：2006-09-13
申请号：EP04804095.0
申请日：2004-12-20
IPC分类号： G10L19/14
CPC分类号： G10L19/04 , G10L19/025 , G10L19/24 , G10L2019/0014
摘要： The invention is based on an adaptive prediction algorithm which can be controlled by a speed coefficient in order to work at a first adaptation speed and with a first degree of precision of adaptation and degree of precision of prediction in the event that the speed coefficient has a first value and with a second degree of precision of adaptation, which is lower than the first, and with a degree of precision of prediction, which is higher than the first in the event that the speed parameter has a second value, wherein the periods of adaptation occurring after the reset times during which the prediction errors are initially increased as a result of the not yet adapted prediction coefficients, are reduced by initially adjusting the speed parameter to the first value (42) and after a while adjusting it to the second value (50). When the speed parameter is readjusted to the second value after a specific time period after the reset times, the prediction errors and the residuals that are to be transferred are optimized or smaller than with the first speed parameter value.
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公开(公告)号：EP1697928A1
公开(公告)日：2006-09-06
申请号：EP05707322.3
申请日：2005-02-10
CPC分类号： G10L19/02 , G10L19/0017 , G10L19/26 , G10L19/265
摘要： The aim of the invention is to encode an audio signal of a sequence of audio values into an encoded signal. To this end, a first monitoring threshold is determined for a first block of audio values of the sequence of audio values, and a second monitoring threshold is determined for a second block of audio values of the sequence of audio values; a version of a first parameterisation of a parameterisable filter is calculated such that the transmission function thereof corresponds approximately to the inverse of the quantity of the first monitoring threshold; a pre-determined block of audio values of the sequence of audio values is filtered by means of the parameterisable filter, using a pre-determined parameterisation that depends, in a pre-determined manner, on the version of the second parameterisation, in order to obtain a block of filtered audio values that corresponds to the pre-determined block; the filtered audio values are quantised in order to obtain a block of quantised filtered audio values; a combination of the version of the first parameterisation and the version of the second parameterisation, containing at least one difference between the version of the first parameterisation and the version of the second parameterisation, is formed; and information containing said combination and from which the quantified filtered audio values and a version of the first parameterisation can be derived is integrated into the encoded signal.
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公开(公告)号：EP1697929A1
公开(公告)日：2006-09-06
申请号：EP05715289.4
申请日：2005-02-10
CPC分类号： G10L19/032 , G10L19/26 , G10L19/265
摘要： Disclosed is a method for quantizing a data signal of a sequence of data values, comprising frequency-selective filtering of the sequence of data values so as to obtain a sequence of filtered data values, and quantizing the filtered data values in order to obtain a sequence of quantized data values by means of a quantizing stage function which copies the filtered data values onto the quantized data values and the curve of which is steeper below a threshold data value than it is above said threshold data value.
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公开(公告)号：EP1687808A1
公开(公告)日：2006-08-09
申请号：EP05701396.3
申请日：2005-02-10
发明人： SCHULLER, Gerald , WABNIK, Stefan , GAYER, Marc
CPC分类号： G10L19/032 , G10L19/265
摘要： The aim of the invention is to dispense with the previous procedure, i.e. interpolation at the filter coefficients and the amplification value in order to obtain interpolated values for the intermediate audio values starting from the support points. Coding containing fewer audible artifacts can be obtained by using the performance limit derived from the masking threshold, preferably from the area below the square sum of the masking threshold, for each support point, i.e. for each parameterization that is to be transmitted, instead of interpolating the amplification value, and then performing interpolation between said performance limits of adjacent support points, e.g. linear interpolation. An amplification value can then be calculated from the determined intermediate performance threshold value at the coder end and the decoder end in such a way that the quantizing noise which is caused by quantizing and whose frequency is constant before post-filtering is done at the decoder end, lies below the performance limit or corresponds thereto following post-filtering.
摘要翻译： 本发明的目的是省去先前的过程，即对滤波器系数和放大值进行内插，以便获得从支持点开始的中间音频值的内插值。 通过使用从掩蔽阈值导出的性能极限，优选地从掩蔽阈值的平方和之下的区域，针对每个支持点，即针对要传输的每个参数化，而不是内插，可以获得包含较少可听伪像的编码 放大值，然后在相邻支撑点的所述性能限制之间执行内插，例如， 线性插值。 然后可以在编码器端和解码器端根据所确定的中间性能阈值来计算放大值，使得在解码器端完成由量化引起并且在滤波之前频率恒定的量化噪声 位于性能极限之下或者在后置滤波之后对应于此。
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