home *** CD-ROM | disk | FTP | other *** search
Text File | 1989-12-09 | 3.1 KB | 67 lines | [04] ASCII Text (0x0000) |
- Apple II
- File Type Notes
- _____________________________________________________________________________
- 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.
- _____________________________________________________________________________
-
- 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
- _________________________________________________________________
- $0000 Audio IFF Apple
- $0002 ASIF instrument Apple
- $0003 Sampled Sound Resource Apple
- $8001 HyperStudio sound Roger Wagner Publishing
- _________________________________________________________________
-
- 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
- _____________________________________________________________________________
- 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
-