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Proposed Equalization for 15 in/s Studio Master Recording on High-Output Low-Noise Tapes

A new equalization and reference fluxivity are proposed; no LF pre-emphasis, reproducing HF equalization +3 dB at 6300 Hz (-25 µs-), and fluxivity of 250 nWb/m. Measured data and a demonstration compare the NAB and proposed performances. Pre-emphasis at 4 kHz is increased from -2 to +1 dB; and at 16 kHz, from +1 to +6.5 dB (NAB was +11 dB in 1950, when developed). Noise and maximum signal at 4 kHz are thus reduced 3 dB (NAB was +11 dB in 1950, when developed). Noise and maximum signal at 4 kHz are thus reduced 3 dB, and at 16 kHz, 5.5 dB. Recording response with less than a total of 0.5 dB ripple up to 20 kHz is achieved with one RC equalizer.

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