Adobe 22011292 User Guide - Page 59

45 Chapter 5: File Menu - Edit View U se the commands on the File Menu to open, save, and close wave files; import audio from video files; perform batch conversions; access recently used waveforms; and more. New Select File > New to create a new, empty waveform. The New Waveform window appears so that you can choose the new file's properties. Options are provided for Sample Rate, Channels, and Resolution. New Waveform Dialog You'll get better-quality sound when you use a higher sample rate and resolution, but you'll use more hard disk space. Audio CDs use a sample rate of 41000 and a resolution of 16 bits per sample. Sample Rate This value determines how many frequencies can be encoded in the audio signal. Higher sampling rates mean a wider bandwidth. Popular sample rates are already listed; just click on one to select it. Or, enter a custom number in the Sample Rate box to specify a different rate from those provided. However, keep in mind that most sound cards only support certain sample rates. Channels Select Mono if you want to record a waveform with just one channel of audio information (such as a voiceonly recording). The Stereo option allows you to create a two-channel waveform with separate right and left channels. This is usually the best option for a music recording. Because they contain twice as much data, stereo waveforms consume double the storage space of mono waveforms. Resolution Three options are provided: • 8-bit creates waveforms where quality is not much of a concern, but small file size is. 8-bit waveforms are usually fine for telephony applications, or for use as embedded sounds in Web pages. While they tend to be noisier than their 16bit counterparts, they're half the size.