[text4new-09上.ppt

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2017-01-05 发布于北京
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[text4new-09上.ppt

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[text4new-09上

* * Chapter 2 Quantization Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 2.1 Quantization Process 2.2 Oversampling and Noise Shaping* 2.3 D/A Converters 2.4 A/D Converters 2.5 Analog and Digital Dither* Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 2.1 Quantization Process Quantization : representation of measured sample x(nT) by quantized sample xQ(nT) with B bits . 量化即在数字系统中用有限位字长表示数，用有限个状态来近似表示给定范围内的任意状态值。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Several concepts： Fig. 2.1.2 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. In practice, the input signal x(t) must be preconditioned by analog means to lie within the full scale range of the quantizer before sent to the sampler and quantizer. (p.64) Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 二种对x的量化方式： Rounding (舍入):quantized to the nearest quantization level. 　 Truncation (截断): quantized to the nearest level below x 舍入的量化误差更小。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.