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The C programming Language By Brian W. Kernighan and Dennis M. Ritchie. Published by Prentice-Hall in 1988 ISBN 0-13-110362-8 (paperback) ISBN 0-13-110370-9 Contents Preface Preface to the first edition Introduction Chapter 1: A Tutorial Introduction Getting Started Variables and Arithmetic Expressions The for statement Symbolic Constants Character Input and Output File Copying Character Counting Line Counting Word Counting Arrays Functions Arguments - Call by Value Character Arrays External Variables and Scope Chapter 2: Types, Operators and Expressions Variable Names Data Types and Sizes Constants Declarations Arithmetic Operators Relational and Logical Operators Type Conversions Increment and Decrement Operators Bitwise Operators Assignment Operators and Expressions Conditional Expressions Precedence and Order of Evaluation Chapter 3: Control Flow Statements and Blocks If-Else Else-If Switch Loops - While and For Loops - Do-While Break and Continue Goto and labels Chapter 4: Functions and Program Structure Basics of Functions Functions Returning Non-integers External Variables Scope Rules Header Files Static Variables Register Variables Block Structure Initialization Recursion The C Preprocessor File Inclusion Macro Substitution Conditional Inclusion Chapter 5: Pointers and Arrays Pointers and Addresses Pointers and Function Arguments Pointers and Arrays Address Arithmetic Character Pointers and Functions Pointer Arrays; Pointers to Pointers Multi-dimensional Arrays Initialization of Pointer Arrays Pointers vs. Multi-dimensional Arrays Command-line Arguments Pointers to Functions Complicated Declarations Chapter 6: Structures Basics of Structures Structures and Functions Arrays of Structures Pointers to Structures Self-referential Structures Table Lookup Typedef Unions

无线电波的覆盖范围广，基于蓝牙技术的电波覆盖范围非常小，半径大约只有50英尺左右约合15米，而Wi-Fi的半径则可达300英尺左右约合100米，办公室自不用说，就是在整栋大楼中也可使用。最近，由Vivato公司推出的一款新型交换机。据悉，该款产品能够把目前Wi-Fi无线网络300英尺接近100米的通信距离扩大到4英里约6.5公里

在过去几年，多数音讯编码的压缩工具中，感观式的音讯编解码器， 像MP3、AAC 都已变成非常普遍，然而，在要求高压缩率的情况下，人耳 不敏感的高频频谱会有较大失真，使得音质在聆听上，会显得较为单调、 低沈。高频重建在近年来，是一种新技术的发展。利用在低频音频讯号的 现有资讯，来重建高频中所失去的频谱部份，使得对数位音频讯号的频宽 可以达到全频宽，进而提升音频讯号解压缩后的品质。最著名的高频重建 方式为频带复制法(Spectral Band Replication : SBR)。对低位元率应用而 言，可以相当完美地达到近似原音质之改善，且在2001 年12 月时，SBR 已变成MPEG-4 标准中的参考模式。在本篇论文里，除了针对MPEG-2 AAC 及MPEG-4 TwinVQ 这两种编解码器的相关模组做一研究及模拟其压缩品 质外，并以SBR 的观念，提出了另外一种以高频重建为主，来增强音频讯 号品质并降低其复杂度的方式。我们并将此演算法，应用於TwinVQ 编解 码器中来证实音讯品质的提升。最后，利用一个可组态的处理器IP，即 Xtensa IP 来实现此系统的解码端部份，并以TIE(Tensilica Instruction Extension)来开发解码端复杂度较高的模组部份的指令，以达到系统规格之 要求。

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详细介绍Perl语言编程。 第一章概述..............................................................................................................................................................................................9 1．1 问题和解答....................................................................................................................................................................................9 1．1．1 本书适合你吗？ .......................................................................................................................................................................................9 1．1．2 为什么如此多的脚注？............................................................................................................................................................................9 1．1．3 练习题和解答呢？ .................................................................................................................................................................................10 1．1．4 习题前的数字是什么意思？.................................................................................................................................................................. 10 1．1．5 如果我是Perl 教师，怎么办呢？ .........................................................................................................................................................10 1．2 Perl 代表什么？ ....................................................................................................................................................................... 11 1．2．1 Larry 为什么发明Perl？......................................................................................................................................................................11 1．2．2 为什么Larry 不采用别的语言？........................................................................................................................................................... 11 1．2．3 Perl 容易学习吗？................................................................................................................................................................................... 12 1．2．4 Perl 为什么如此流行？...........................................................................................................................................................................13 1．2．5 Perl 正在发生怎样的事情？...................................................................................................................................................................13 1．2．6 Perl 擅长什么？....................................................................................................................................................................................... 13 1．2．7 Perl 不擅长什么？................................................................................................................................................................................... 14 1．3 怎样获得Perl？ .........................................................................................................................................................................14 1．3．1 什么CPAN？.......................................................................................................................................................................................... 14 1．3．2 怎样获得支持？ .....................................................................................................................................................................................15 1．3．3 有其它的支持吗？ .................................................................................................................................................................................15 1．3．4 当发现Perl 中有错误时，该怎么办？ .................................................................................................................................................16 1．4 怎样才能写一个Perl 程序？.....................................................................................................................................................16 1．4．1 一个简单的例子.....................................................................................................................................................................................17 1．4．2 这个程序有些什么？ ............................................................................................................................................................................. 18 1．4．3 怎样编译Perl？....................................................................................................................................................................................... 19 1．5 快速了解Perl .............................................................................................................................................................................19 1．6 第六节练习................................................................................................................................................................................20 第二章标量数据......................................................................................................................................................................................21 2．1 数字............................................................................................................................................................................................. 21 2．1．1 所有数字内部的格式一致.......................................................................................................................................................................21 2．1．2 浮点数..................................................................................................................................................................................................... 21 2．1．3 整数......................................................................................................................................................................................................... 22 2．1．4 非十进制整数.......................................................................................................................................................................................... 22 2．1．5 数字操作符.............................................................................................................................................................................................. 23 2．2 字符串......................................................................................................................................................................................... 23 2．2．1 单引号字符串.......................................................................................................................................................................................... 24 2．2．2 双引号字符串.......................................................................................................................................................................................... 24 2．3．3 字符串操作符.......................................................................................................................................................................................... 25 2．2．4 数字和字符串之间的自动转换............................................................................................................................................................... 26 2．3 Perl 内嵌的警告(warnings)......................................................................................................................................................... 26

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