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The 8-track tape (formally Stereo 8; commonly called eight-track cartridge, eight-track tape, and eight-track) is a magnetic-tape sound recording technology that was popular [2] from the mid-1960s until the early 1980s, when the compact cassette, which pre-dated the 8-track system, surpassed it in popularity for pre-recorded music. [3] [4] [5]
The first commonly available increase in tape length resulted from a reduction in backing thickness from 1.5 to 1.0 mil (38 to 25 μm) resulting in a total thickness reduction from 42 to 35 μm (1.7 to 1.4 mils), which allowed 3,600 ft (1,100 m), 1,800 ft (550 m), and 900 ft (270 m) tapes to fit on ten-and-a-half-, seven-, and five-inch reels respectively.
Dimensions: 9.5 × 6.2 × 1.5 cm ... Hi8 tapes were also used for an 8-track professional digital audio format called DTRS, including the Tascam DA-88 and similar ...
The 8-track cartridge tape speed was slower (3 + 3 ⁄ 4 ips compared to Fidelipac's 7 + 1 ⁄ 2 ips) and did not have adequate tape support pads, and thus was not "broadcast quality." The lower speed and narrower tracks in 8-track cartridges led to higher noise and reduced frequency response. The 8-track design also lacked a cue track.
S/N ratio varies directly with track width, due to the Gaussian nature of tape noise; doubling the track width doubles the SNR. With good electronics and comparable heads, 8-track cartridges should have half the signal-to-noise ratio of quarter-track 1 ⁄ 4" tape at the same speed, 3 + 3 ⁄ 4 ips.
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Cassette tape, a two-spool tape cassette format for analog audio recording and playback and introduced in 1963 by Philips; DC-International, a format that was created by Grundig after Phillips had abandoned an earlier format that was being created alongside the Compact Cassette; 8-track tape, continuous loop tape system introduced in 1964
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