Disc, tape, film, cylinder, or wire on which sound vibrations have been registered so that the sound may be reproduced; and paper rolls on which the notes of a music composition are represented by perforations in the paper and from which sound can be mechanically produced.
Special class of sound recording to which the item belongs (e.g., a cylinder).
Contains blank (#) or a fill character (|).
Playback speed of the sound recording.
Configuration of playback channels for a sound recording.
Width of the groove of the recording for discs or the pitch of the groove for cylinders.
Diameter of an open reel or disc, or the dimensions of a cassette, cartridge, or cylinder.
Width of the tape.
Number of tracks on a tape.
Final tape production master that is used to make a disc master or a tape duplication master.
Sound tape produced from the master tape.
Negative disc master that is used for the preparation of the mother from which more serviceable and longer lasting metal stampers can be made.
Includes discs or tapes issued as limited pressing or limited issue for private distribution.
Exact copy of the original disc recording pressed from the disc master. From the metal mother a negative metal stamper is made to press discs for distribution.
Negative metal part, produced from the mother in an electroplating procedure, from which 500 to 750 discs may be pressed.
Either one finished disc or one of a very limited pressing is made, designed to be examined aurally before a decision is made to proceed with a pressing.
Type of disc, cylinder, or tape is not known.
Kind of material used in the manufacture of sound recordings (both instantaneous and mass-produced).
Kind of cutting of the grooves used on a disc.
Vertical cutting, with no lateral information intended for reproduction.
Compact audio discs are coded n as they are pitted rather than cut.
Playback characteristics for sound recordings, including special equipment or equalization necessary for proper playback. This code is not used to indicate special processes used during recording unless those processes must be applied during playback.
National Association of Broadcasters (NAB) standard was used for the transcription of the recording and NAB playback equalization is required.
Comité consultatif de la radiodiffusion (CCIR) standard was used for the transcription of the recording and CCIR playback equalization is required.
How the sound was originally captured and stored. Re-releases of recordings should be coded for the original capture and storage technique, even though such re-releases may have been enhanced using another technique.
Usually a disc or cylinder recording, captured using an acoustical horn and diaphragm and stored directly on a master surface. Most acoustical recordings date from before 1927/29 when electrical recording equipment became available.
Disc recordings captured using electrical equipment and stored directly on a master surface. All recordings made with microphones and other electrical equipment prior to the availability of magnetic recording techniques in the late 1940s used direct storage.
Sound recordings which were captured electrically and stored using digital techniques.
Sound recordings which were captured using electrical techniques and stored as modulations and pulses on a magnetic surface. Most recordings made from the late 1940s until early 1980s are analog electrical recordings.