On the previous part 10, I studied on the history and the background toward the revised NAB Standards in 1949. During the formulation, there was a strong discussion on the NAB Standards’ high frequency pre-emphasis, that was “too much” and “should be weakened to cope with the high frequency distortion”.
具体的には、100μs(+16dB at 10,000Hz)ではなく、少なくとも 75μs(約+13.5dB at 10,000Hz)に落とすべき、といった意見でした。
More precisely, many engineers and researchers at the time claimed that the 100μs pre-emphasis (+16dB at 10,000Hz) should be lowered at least to 75μs (approx. +13.5dB at 10,000Hz).
A few months have passed since I posted the last article for some reason – anyway, this time as Pt.11, I am going to continue learning the history of disc recording – the introduction of Columbia/CBS’s LP (Long Playing Microgroove records) for consumer market in June 1948 and its history. As this Pt.11 became extremely lengthy, the story of “Columbia” EQ curves for recording/reproducing will be featured in the coming episode (Pt.12).
The more I dug into the history (and advent) of Long Playing Microgroove records, the more excitements I got – like I was reading detective novels.
source: LIFE Magazine, July 26, 1948, p.40 MICROSCOPIC VIEW of the record surfaces shows contrast between the old-style .01-inch grooves in bottom half of picture and new .003-inch microgrooves shown above them. LP grooves diminish surface noise. LIFE誌1948年7月26日号に掲載されたLP登場の記事より。マイクログルーヴLP盤の溝と、従来の78回転盤の溝を比較した写真
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