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|Direct Stream Digital Interchange File Format, DSDIFF, Version 1.5
|Format for the storage or exchange of one-bit delta sigma modulated audio, often called Direct Stream Digital, or for the losslessly compressed version called Direct Stream Transfer (DST).
As of 2006, delta sigma modulation is almost exclusively disseminated to endusers on the tangible media format called Super Audio CDs (SACDs), developed by SONY in association with Philips. The DSDIFF_1_5 file format is used by music producers to store DSD content or to deliver it "to the label" for reproduction on SACDs.
|Relationship to other formats
|IFF, IFF (EA Interchange File Format 1985)
|DSD, One-bit Delta Sigma Audio Encoding
|DST, Direct Stream Transfer format for lossless encoded DSD audio, not documented at this Web site
|Marker information, in what is called a Time File, used to support certain editorial or production workflows, not documented at this Web site
|LC experience or existing holdings
|None, although the collections of the Motion Picture, Broadcasting, and Recorded Sound Division include SACDs.
|None. For preservation reformatting, the Library prefers Broadcast WAVE (WAVE_BWF_1 and WAVE_BWF_2).
|Developed by Royal Philips Electronics of the Netherlands, now overseen by Sonic Studio LLC.
|Direct Stream Digital Interchange File Format, DSDIFF, Version 1.5 (2004) and Recommended Usage of DSDIFF Version 1.5.
|Adoption of file version unknown.
|Licensing and patents
|Transparent wrapper. DSD bitstream is relatively transparent; DST is likely to be less so.
|Technical protection considerations
|None indicated in specification.
|Details unknown; this is a very specialized format for professional producers.
|Fidelity (high audio resolution)
|DSDIFF_1_5 files can be structured for 2 channels or for "5- or 6-channels" (presumably for 5.1 mixes). SACDs may contain a 2-channel stereo mix, a surround mix (usually the 5.1 layout), other mixes, or even multiple mmix versions.
|Support for user-defined sounds, samples, and patches
|Functionality beyond normal rendering
|Not fully investigated. DSDIFF_1_5 files can be divided into ten Division Files to overcome size limits imposed by some operating systems.
|Indicated in Recommended Usage, p. 16
|For a DSDIFF_1_5 Time File; see Recommended Usage, p. 18
|For a DSDIFF_1_5 Division File, not to exceed ten in number; see Recommended Usage, p. 16
|Internet Media Type