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channels have the same frequency response and the image stability is vastly improved, because you are not matrixing Now you re not worrying about a loud sound in the center channel pulling in everything else inward, spatially speaking So, it is a much more stable multi-channel sound image that is created If you are watching a DVD movie of Bridges of Madison County and you ve got Clint Eastwood and Meryl Streep out sitting in some eld somewhere talking, if you are watching it on a TV broadcast, when they speak, subtly but perceptively you will notice that the chirping crickets in the background tend to get quieter during the instance while they are actually speaking-the cricket level is riding up and down With a DVD version of the same lm, the spatial position of the crickets is going to be rock solid They aren t going to be affected by what is happening in the center channel Sounds like to accomplish this, you need a whole new set of audio tools That is basically true You would have to follow the multi-channel lm sound model, rather than the stereo, or two-channel music production model Yes, you do need some different tools and different aesthetic judgements to make We ll talk a little bit about that but before we do, let me nish the thought on Dolby Digital We ve mixed our program to ve discrete channels plus we ve got this low-frequency effects channel We store them on some medium and now we want to stick them on the DVD While, the DVD doesn t have enough bandwidth to carry if we use the compact disc data rate, 16-bit, 441KHz, that requires 10MB per minute for stereo Now, let s make life easy and say we are talking about 6 channels, even though that is not quite true, that would mean three times that, now we have gone to 30MB per minute you just can t get the data off fast enough to do video and all that sound So, you need a way to compress the data (we re talking about digital data compression as opposed to audio signal processing compression) to reduce the data rate of all this audio That is what Dolby Digital does It is a data compression codec in the same way that RealAudio is a codec for compressing mono or stereo sound, so that you can download it over a modem Dolby Digital makes it possible to get all of those channels of discrete sound onto a DVD and then off again within the constraints of how much bandwidth the DVD player has how much data can you get off a disc at one time.

1 Using the Smart Drawing Tool, sketch the shape of a trapezoid (refer to Figure 9-1;

two sides are parallel, the other two sides converge) Upon releasing the mouse button, CorelDRAW translates your sketch into a Perfect Shape

Perfect Shape, a special category of shape Use the Shape Tool next to click-drag the glyph node You ll see that the parallel sides remain parallel, and the converging sides slope away and toward each other By duplicating this Perfect Shape, you can edit with the Shape Tool and create an array of trapezoids, all different in appearance but all editable indefinitely, and all retain the geometric structure of a Perfect Shape To learn more about creating Perfect Shapes and manipulating glyph nodes, see Using Perfect Shape Tools, later in this chapter The Smart Drawing Tool helps you quickly draw and translate a variety of sketched shapes into different, geometrically flawless shapes more efficiently than using multiple tools Each of

11

FIGURE 9-1

CHAPTER 9:

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.

the translated shapes has its own special properties, which you ll learn in detail in the sections that follow

The Rectangle Tool is simple enough to use, but it doesn t just create a four-sided, rightangle polygon it creates a rectangle that has special properties in CorelDRAW You ll find it in the Toolbox, as shown next, or you can quickly select it by pressing the F6 shortcut key

Ill 9-3