NT (cassette)

NT (cassette)
NT cassette Player
Comparison with other memory cards
NT cassette compared to various memory cards
NT cassette compared to various recording media

NT was a digital memo recording system introduced by Sony in 1992, sometimes marketed under the name Scoopman. The system stored memos using helical scanning on special microcassettes, which were 30 × 21.5 × 5 mm with a tape width of 2.5 mm, with a recording capacity of up to 120 minutes. The Scoopmen media comes in three forms: The Sony NTC-60, -90, and -120, each describing the length of time (in minutes) the media could record.

NT stands for Non-Tracking, meaning the head moves at a shallower slope to that of the tracks on the tape, crossing several during each pass, albeit only reading partial data from each one. By making several different passes it is possible to reassemble the complete data for each track, in memory. This considerably reduced the complexity and size of the head, and therefore the recorder.

Another feature was Non-Loading, which meant instead of having a mechanism to pull the tape out of the cassette and wrap it around the drum, the drum was pushed inside the cassette to achieve the same effect.

Audio sampling was in stereo at 32 kHz/12 bit and encoded using a form of linear delta modulation called LDM-2.

See also

v · d · eAudio recording formats
Analog

Phonautogram (1857) · Phonograph cylinder (1877) · Gramophone record (1894) · Wire recording (1898) · Sound-on-film (1919) · Reel-to-reel tape (1940s) · SoundScriber (1945) · Gray Audograph (1945) · Dictabelt (1947) · LP record (1948) · 45 rpm record (1949) · On-the-ribs recordings (late 1940s) · RCA tape cartridge (1958) · Fidelipac (1959) · Stereo-Pak (1962) · Compact Cassette (1963) · 8-track (1964) · PlayTape (1966) · Mini-Cassette (1967) · Microcassette (1969) · Steno-Cassette (1971) · Elcaset (1976) · Cassette single (1980) · Picocassette (1985)
Digital

Soundstream (1976) · X80/ProDigi (1980) · DASH (1982) · Compact Disc (1982) · Digital Audio Tape (1987) · ADAT (1991) · MiniDisc (1992) · NT (1992) · Digital Compact Cassette (1992) · High Definition Compatible Digital (1995) · Extended Resolution Compact Disc (1995) · 5.1 Music Disc (1997) · Super Audio CD (1999) · DVD-Audio (2000) · USB flash drive (as audio format) (2004) · Hi-MD (2004) · slotMusic (2008) · BD-Audio (2008)

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