Adobe 22011292 User Guide - Page 368

354 ASCII Text Data Audio data can be read to or written from files in a standard text format, with each sample separated by a carriage return, and channels separated by a tab character. The file extension is .txt. An optional header can be placed before the data. If there is no header text, then the data is assumed to be 16-bit signed decimal integers. The header is formatted as KEYWORD: value with the keywords being: SAMPLES, BITSPERSAMPLE, CHANNELS, SAMPLERATE, and NORMALIZED. The values for NORMALIZED are either TRUE or FALSE. Attack The first part of the sound that you hear. Some sounds (like pianos and drums) have a very fast attack; the loudest portion of the sound is reached very quickly. A sound with a slow attack rate (such as a soft string section) slowly increases in volume. Attenuate To make smaller, such as to reduce volume or signal level. AU This format is the standard found on NeXT and Sun computers, and has many data types. Adobe Audition supports the CCITT mu-Law, A-Law, G.721 ADPCM, and linear PCM data variants. Like Windows WAV and AIFF files, this format can support mono or stereo, 16-bit or 8-bit, and a wide range of sample rates when saved as linear PCM. The most common use for the AU file format is for compressing 16-bit data to 8-bit mu-law data. AU is used quite extensively for distribution on the Internet, and for inclusion in Java applications and applets. AU files can have either an .au or .snd extension. Audio File Format The method used for writing audio data to disk for storage is known as a File Format. Adobe Audition supports many file formats, which themselves support a variety of properties such as sample rate, compression, etc. Some file formats may not be compatible with other systems. Windows PCM (.wav) is found most often in the Windows environment. File formats can be chosen in File > Save As... Audition Loop See CEL. Automation The process of making pan and volume changes in a mix that will happen every time the file plays back. In many hardware mixers, this is done with "automatic" volume and pan sliders that can be programmed to remember timing information and move themselves appropriately during playback. Automation is handled by Envelopes in Adobe Audition. Background Mixing This is the process that Adobe Audition uses to combine waveforms for monitoring while in the multitrack environment. As its name implies, background mixing occurs behind the scenes, and works much of the time to reflect changes to your session, such as a moved or deleted waveform, a volume change, or new material recorded into a track. An update of the background mixing process can be seen in the Mix Gauge. Band Pass Filter A filter or DSP effect that allows some audio frequencies to pass, but not others. Basic Cue One of the four types of Adobe Audition Cues. Basic Cues are used to mark important sections of the waveform for later reference (such as to remind yourself of an editing point). They're also used to specify stop and start positions for the Adobe Audition's Play List. Beat Cue One of the four types of Adobe Audition Cues. Beat Cues are just like Basic Cues, but they're specifically for marking musical beats. Beats Per Minute (BPM) The number of steady even pulses that occur in a piece of music every 60 seconds. The BPM value defines the tempo of the musical selection.