Kohji Matsubayashi (松林弘治)

Things I learned on Phono EQ curves, Pt. 7

前回 Pt.6 では、アセテート録音機の誕生、そこで使われていたカッターヘッドの記録特性、横振動盤再生時の高調波歪の論文、1938年時点での超軽量ピックアップの開発など、あれこれについて調べました。

On the previous part 6, I studied on the advent of instantaneous lacquer disc recorders, frequency responses of the instantaneous cutterheads, an important paper on harmonic distortion of phonograph reproduction, development of ultra-lightweight pickups in 1938, etc.


This time, I am going to continue learning the history, including an advent of “jukebox” players and piezoelectric pickups, attempt of “constant-amplitude” recording/reproducing that proved abortive, followed by the standardization of the 1942 NAB curve (for electrical transcription discs). The advent of microgroove LPs is a few steps ahead.

source: “Sound recording and reproducing system”, US Patent 2,139,916, by Stuart W. Seeley.

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