Hz to 20 kHz. For example, when you listen to music recorded on a compact disc, the CD-Driver converts the digital audio file back into an analog signal. As shown in Figure 2-6. Now that video can be stored on computer's hard disk, video from a VCR can be played in a window on system's display, and video can be put into the work, presentations, and programs. Computer technology has evolved significantly to support video, but that evolution is not yet complete, and creating high-quality video footage in the first place can often be a challenge.
Video capture involves translating analog video frames into a series of bitmaps.
During playback, the bitmaps display onscreen at a speed that tricks the eye into seeing motion. With the proper card and drivers, you can incorporate analog video from a VCR, video, camera, or videodisc player directly into computer. As shown in Figure 2-7. Composite video is the NTSC standard that combines color and brightness into one signal. Digital provides the signal in a digital form using either an industry-standard or a propriety format.