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Highway Hi-Fi
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Highway Hi-Fi : ウィキペディア英語版
Highway Hi-Fi

Highway Hi-Fi was a system of proprietary players and seven-inch phonograph records with standard LP center holes designed for use in automobiles. Designed and developed by Peter Goldmark, who also developed the LP microgroove, the discs utilized 135 grams of vinyl each, enough to press a then-still-standard 10-inch LP (12-inch LPs of the period commonly used 160 grams of vinyl each and 45s used roughly 70 grams).
== History ==

The system appeared in Chrysler automobiles from 1956 to 1959 (1956-1958 model years). Records for the system were manufactured exclusively by Columbia Special Products, and could hold roughly 45 minutes of music or an hour of speech per side. This was accomplished by the use of a very slow rotation speed of 16⅔ RPM—versus 33 RPM for long-playing records and 45 RPM for singles—in conjunction with an extremely tight groove pitch of 550 grooves per inch (216.5 grooves per centimeter, over four times that of a standard monaural LP of the period). The recording surface extended to an unusually small diameter of , which constrained the label to for long-playing titles, but demonstration discs with brief contents not requiring an extended playing time were manufactured with standard 3 inch (76 mm) labels.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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