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Quantizing Quantizing converts the sampled analog signal into a sequence of digital levels Companding Companding (which is short for compressing and expanding) involves encoding the quantized voice samples into a coded sequence of numbers The simplest coding scheme is linear in which each increment in the output corresponds to an equal step in the quantized input Other coding schemes use non-linear formulas to deliver better sound quality Still more use special compression techniques to reduce the amount of bandwidth required by making assumptions about the nature of the input signal A CODEC (which stands for coder-decoder) is used to perform the sampling, quantization, and companding function CODECs can be implemented in hardware or software Digital carrier circuits in the PSTN use the following coding schemes: Law PCM PCM stands for Pulse Code Modulation Standard PCM involves sampling at a rate of 8000 times per second (8kHz) where each sample is 8 bits The highest bit represents the sign and the other 7 bits represent the absolute amplitude of the sample The result is a 64kbps stream of digitized voice data Law PCM (pronounced mu-law or micro-law) refers to the non-linear companding formula which divides the

#include <stdioh> int ferror(FILE *stream);

The ferror( ) function checks for a file error on the given stream A return value of zero indicates that no error has occurred, while a nonzero value means an error To determine the exact nature of the error, use the perror( ) function

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The CompTIA Network+ certification challenges you to understand virtually every aspect of networking not a small task, but luckily for you there s a long-used method to conceptualize the many parts of a network called the Open Systems Interconnection (OSI) seven-layer model The OSI seven-layer model is a guideline, a template that breaks down how a network functions into seven parts called layers If you want to get into networking and if you want to pass the CompTIA Network+ certification exam you must understand the OSI seven-layer model in great detail The OSI seven-layer model provides a practical model for networks The model provides two things For network techs, the OSI seven-layer model provides a powerful tool for diagnosing problems Understanding the model enables a tech to determine quickly at what layer a problem can occur and thus zero in on a solution without wasting a lot of time on false leads The model also provides a common language to describe networks a way for us to communicate to each other about the functions of a network Figure 2-1 shows a sample Cisco Systems Web page about configuring routing a topic this book covers in detail later on A router operates at Layer 3 of the OSI seven-layer model, for example, so you ll hear techs (and Web sites) refer to it as a Layer 3 switch That s a use of the OSI seven-layer model as language This chapter looks first at models, and specifically at the OSI seven-layer model to see how it helps make network architecture clear for techs The second and third portions of the chapter apply that model to the practical pieces of networks, the hardware and software common to all networks

amplitude into 16 chords (identified by 4 bits) which are in turn divided into 8 levels (identified by 3 bits) The chords are not equally sized so that the low-amplitude chords have more granularity than the high-amplitude chords (the distribution is roughly logarithmic) The result is a digital signal that has less perceived noise on quiet or idle channels Law PCM is the standard for digital carrier circuits in North America and Japan ALaw PCM ALaw PCM is the standard for digital carrier circuits in Europe The only difference between Law PCM and ALaw PCM is the companding formula ALaw's companding formula results in less noise for quieter signals but more noise for an idle (silent) channel Adaptive Pulse Code Modulation, or ADPCM, is a scheme which further compresses PCM so that only 32kbps of bandwidth are required

Example The following code fragment aborts program execution if a file error occurs:

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