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The hierarchical structure of MPEG-1 plus extension streams means that a two-channel MPEG decoder need only decode a two-channel data stream, and a six-channel MPEG decoder need only process a six-channel data stream The eight-channel MPEG decoder is the only one that must decode the entire contents of an eight-channel stream Therefore, an MPEG-1 decoder sees only the MPEG-1 compatible data to produce stereo audio, whereas an MPEG-2 decoder combines it with the first layer of extension data to produce 51-channel audio or, with both layers of extension data, to produce 71-channel audio This clever technique provides an advantage to MPEG-2 over other encoding schemes, since cheap MPEG-1 decoders can be used when necessary However, the cost of MPEG-2 decoders dropped in a few years to about the same level as MPEG-1 Nevertheless, there are several drawbacks to the backward-compatibility scheme, in addition to the inefficiency of matrixed channel duplication The original two-channel MPEG-1 encoding process was not developed with matrixed audio in mind and therefore may remove surround-sound detail The matrix-canceling process tends to expose coding artifacts; that is, when the signal from a matrixed channel is removed, the remaining signal may no longer mask the same neighboring frequencies or noise as the original signal, thus unmasking the noise introduced by formerly appropriate levels of quantization This problem can be mitigated in part with special processing by the encoder, but this makes the encoding process less efficient with a resulting loss in quality at a given bit rate MPEG-2 includes a non-backward-compatible process, originally labeled NBC but now known as advanced audio coding (AAC) This coding method deals with all channels simultaneously and is thereby more efficient, but it was not developed in time to be supported by DVD MPEG-2 allows a variable bit rate in order to handle momentary increases in signal complexity Unfortunately, this turns out to be difficult to deal with in practice because audio and video are usually processed separately, and with two variable rates there is a danger of simultaneous peaks pushing the combined rate past the limit This can be controlled by limiting the peak rate, but this is done at the expense of possibly reducing audio quality in difficult passages.

Dolby Digital audio compression (known as AC-3 in standards documents) provides for up to 51 channels of discrete audio One of the advantages of Dolby Digital is that it analyzes the audio signal to differentiate short, transient signals from long, continuous signals Short sample blocks are then

The patch is called the Virtual Machine Sandbox fix, available on the main IE patch list at http://wwwmicrosoftcom/windows/ie/download/defaulthtm You may even consider disabling Java entirely for ultimate security, although your experience with the Web may be muted when visiting those sites that use Java applets (Applets are clientside Java programs) To disable Java in IE, follow the procedure outlined in the section on IE security zones earlier, and make sure to manually disable any settings that reference Java in addition to setting security of the Internet zone to High

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< xml version="10" encoding="UTF-8" > Page 438 You can see a list of all the background jobs you created and their status In this case, the job is finished and we can check it for errors If the job is still running on the server, it will be marked as Active If it is still waiting in the job queue, it will be marked as Ready Jobs that are cancelled by the system administrator are marked as Cancelled

used for short sounds, and long sample blocks are used for longer sounds This results in smoother encoding without transient suppression and block boundary effects that can occur with fixed block sizes For compatibility with existing audio/video systems, Dolby Digital decoders can downmix multichannel programs to ensure that all the channels are present in their proper proportions for mono, stereo, or Dolby Pro Logic reproduction Dolby Digital uses a frequency transform somewhat like the DCT transform of JPEG and MPEG and groups the resulting values into frequency bands of varying widths to match the critical bands of human hearing Each transformed block is converted to a floating-point frequency representation that is allocated a varying number of bits from a common pool, according to the importance of the frequency band The result is a constant bit-rate (CBR) data stream Dolby Digital also includes dynamic range information so that different listening environments can be compensated for Original audio mixes, such as movie sound tracks, which are designed for the wide dynamic range of a theater, can be encoded to maintain the clarity of the dialogue and to enable emphasis of soft passages when played at low volume in the home Dolby Digital was developed from the ground up as a multichannel coder designed to meet the diverse and often contradictory needs of consumer delivery It also has a significant lead over other multichannel systems in both marketing and standards adoption By 2000, over 57,000 Dolby Digital decoders were entrenched in living rooms, compared with essentially no MPEG2 audio decoders, no SDDS decoders, and relatively few DTS decoders Dolby Digital has been chosen for the US DTV standard and is being used for digital satellite systems and most other digital television systems

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