RIAA$501632$ - traduzione in italiano
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RIAA$501632$ - traduzione in italiano

STANDARD RECORDING PREEMPHASIS AND PLAYBACK DEEMPHASIS FOR 33 AND 45 RPM LONGPLAY VINYL RECORDS
RIAA equalisation; RIAA curve; RIAA EQ; RIAA equalization curve; New Orthophonic
  • The RIAA equalization curve for playback of vinyl records. The recording curve performs the inverse function, reducing low frequencies and boosting high frequencies.

RIAA      
associazione americana dei produttori discografici

Wikipedia

RIAA equalization

RIAA equalization is a specification for the recording and playback of phonograph records, established by the Recording Industry Association of America (RIAA). The purposes of the equalization are to permit greater recording times (by decreasing the mean width of each groove), to improve sound quality, and to reduce the groove damage that would otherwise arise during playback.

The RIAA equalization curve was intended to operate as a de facto global industry standard for records since 1954, but when the change actually took place is difficult to determine.

Before then, especially from 1940, each record company applied its own equalization; over 100 combinations of turnover and rolloff frequencies were in use, the main ones being Columbia-78, Decca-U.S., European (various), Victor-78 (various), Associated, BBC, NAB, Orthacoustic, World, Columbia LP, FFRR-78 and microgroove, and AES. The obvious consequence was that different reproduction results were obtained if the recording and playback filtering were not matched.