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1. 发明授权

US5581480A Method and apparatus for mixing multiple channels of sampled digital audio using a non-linear clipping function 失效
标题翻译：用于使用非线性剪切功能混合多个采样数字音频信道的方法和装置
公开(公告)号：US5581480A
公开(公告)日：1996-12-03
申请号：US241078
申请日：1994-05-10
申请人： Kipley J. Olson , James D. Reekes , Samuel C. Dicker
发明人： Kipley J. Olson , James D. Reekes , Samuel C. Dicker
IPC分类号： G06T1/00 , H04H60/04 , H04R3/00 , G06F17/00
CPC分类号： H04H60/04 , G06T1/00 , H04R3/00
摘要： Briefly, a method and apparatus for mixing a plurality of channels of digital audio samples using a non-linear clipping function which has a variable scaling factor is disclosed. The non-linear curving function is capable of being graphically represented by a curve which is sloped at the edges before reaching the maximum values. In a first embodiment, the non-linear clipping function is applied to the samples and values are calculated in real-time. Preferably, inputs to the non-linear clipping function are modified depending upon any significant trends, e.g. increasing or decreasing, in the sums of samples over time. In a second embodiment, to reduce processor overhead, prior to real time application of the non-linear clipping function, the calculations are performed and a lookup table is generated. This lookup table is then used during real time to apply the clipping function to the input data so that the non-linear function is not recalculated whenever multiple channels are mixed. Lookup tables can be used in combination to apply the non-linear clipping function to a number of channels for which there is not a defined a look up table.
摘要翻译：简而言之，公开了一种使用具有可变缩放因子的非线性限幅功能混合多个数字音频样本通道的方法和装置。非线性弯曲功能能够由在达到最大值之前在边缘倾斜的曲线图形地表示。在第一实施例中，将非线性剪切函数应用于样本，并且实时计算值。优选地，根据任何显着趋势来修改对非线性裁剪功能的输入，例如，随着时间的推移，样本数量的增加或减少。在第二实施例中，为了减少处理器开销，在非线性裁剪功能的实时应用之前，执行计算并产生查找表。然后在实时中使用该查找表将削波函数应用于输入数据，以便每当混合多个通道时，不重新计算非线性函数。查找表可以组合使用，以将非线性裁剪功能应用于没有定义的查找表的多个通道。

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