Adobe 22011292 User Guide - Page 210

196 CHAPTER 10 Analyze Menu - Edit View • Lines: The waveform's left and right channels appear as simple lines, with each channel displayed in a different color. • Area (Left on top): The Area modes are similar to the Lines option, but the area beneath the lines is rendered as a solid color. The lines that represent the frequencies are smoothed out, and the left channel appears in front of the right channel. • Area (Right on top): Choose this option to have the right channel appear in front of the left channel in Area mode. • Bars (Left on top): While the Area modes smooth out the lines that represent the frequencies, the Bars modes show the actual limitations on analysis resolution by splitting the display into rectangular segments. The higher the FFT size, the greater the analysis resolution, and the narrower the bar. Select this option to have the left channel appear in front of the right channel. • Bars (Right on top): Choose this option to have the right channel appear in front of the left channel in Bars mode. Scan Click this button to scan the highlighted selection and show all frequencies present in that selection. Advanced Press the Advanced button to see additional options. FFT Size This drop-down list allows you to select from several FFT (Fast Fourier Transform) sizes. Higher FFT sizes give you more accurate results in terms of frequency (such as the overall frequency estimate), but are also much slower. Note: When you set the FFT size to 4096 or lower, the Frequency Analysis window updates in real time while you play your file. (Keep in mind that how well it ultimately updates in real time with these settings is based on your computer's speed.) You can also generate a step-by-step animation by clicking on the main waveform window and then holding down the Right Arrow key. As the cursor scrolls across the display, CEP displays the spectral information in the Analysis window. FFT Window Type This drop-down list lets you choose from six types of FFT windows. Each window type displays a slightly different kind of frequency graph. The Triangular window gives a more precise frequency estimate, but it's also the noisiest. This means that other frequencies will be shown as present, even though they may be much lower in volume. At the other extreme, the Blackmann-Harris window has a broader frequency band which isn't as precise, but the sidelobes are very low, making it easier to pick out the major frequency components. Reference The value entered into this field means that a full scale (FS) sine wave will show up as that amplitude. For instance, with the default value of zero, a full scale sine wave will display with its peak at 0dB. A value of 30dBFS would mean that a full scale sine wave displays with its peak at 30dB. In other words, this value essentially just scoots the display up or down. Copy to Clipboard Press this button to send a text-based frequency report of the current waveform to the Windows Clipboard, ready to paste into your favorite Windows-based text editor or word processor. Zooming (Frequency Ruler) To zoom in on the Frequency Analysis window's x-axis (horizontal) ruler - the one that measures frequency - place your mouse pointer over the ruler. Then, right-click and drag to select the area you wish to zoom in on. (You'll notice that your pointer turns into a magnifying glass.) Release the right-click button and the zoomin occurs.