Apple II
File Type Notes
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                                                  Developer Technical Support


File Type:         $D8 (216)
Auxiliary Type:    All

Full Name:     Sampled Sound file
Short Name:    Sampled Sound

Written by:    Matt Deatherage                                   January 1990

Files of this type and auxiliary type contain sampled sound data.
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Files of type $D8 should contain sampled or digitized sound data.  The data is 
intended to be fed to sound hardware to reproduce a sound that was recorded 
"live."  The converse to "sampled" sound is "synthesized" sound, where a 
computer creates wave forms and feeds them to sound hardware.

Sampled sound data can be stored in many formats.  The data is traditionally 
sampled in discrete intervals, with a given number of bits used to record the 
intensity of the sound at the sampling point.  In addition to the samples 
themselves, this requires that the file contain the sampling interval (or 
rate) and perhaps the number of bits used in sampling.  Other information may 
be needed by applications, such as the duration of the sound, comment or 
copyright information, compression information or parameters, or "markers" 
which denote specific points within the sampled sound.

Apple Computer, Inc. presents a standard for such files, the Audio Interchange 
File Format (Audio IFF), described in another File Type Note.  While Audio IFF 
is suitable for many needs, it cannot hope to cover all.  Apple assigns 
auxiliary types in this file type for such purposes.

Note:  Apple does not recognize a standard in which the sampling 
       rate is contained in a file's auxiliary type.  Doing so is not 
       possible within the realm of file type and auxiliary type 
       assignment.

The following auxiliary type assignments are current for this file type as of 
the publication date of this Note:

      Auxiliary Type  Short Name                Developer
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      $0000           Audio IFF                 Apple
      $0002           ASIF instrument           Apple
	  $0003           Sampled Sound Resource    Apple
      $8001           HyperStudio sound         Roger Wagner Publishing
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                     Table 1-Auxiliary Type Assignments

The auxiliary types for this file type are reserved; any not listed in this 
Note or About File Type Notes must be assigned by Apple Computer, Inc.  Using 
any file type or auxiliary type not assigned may result in conflicting 
identification of files by totally unrelated programs.  To obtain an auxiliary 
type assignment in this file type, see About File Type Notes.


Further Reference
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  o  Apple IIGS Technical Note #76, Miscellaneous Resource Formats
  o  File Type Note for file type $D8, auxiliary type $0000, Audio IFF File
  o  File Type Note for file type $D8, auxiliary type $0002, ASIF File
