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Absolute Flux and Frequency Response Characteristics in Magnetic Recording: Definitions and Standardization
In order to have interchangeable tape recordings, standards are needed for frequency response characteristics and for the recorded flux. The quantities, terms, and definitions needed for this standardization are developed; the absolute flux and the wavelength response of the recorded signal are most appropriately expressed as the -short-circuit remanent flux-; the ratio of this flux to the voltage input to the recorder is defined as the -recording flux characteristic.- The need for equalization, and the division into recording and reproducing equalization, are developed. Standard equalization of many organizations are shown as -flux characteristics.- Terms and definitions used in the various standards are compared with those developed here. This shows that the different standards are not consistent; different concepts are used, and the same terms have conflicting usages, resulting in confusion when standards are compared. Standard -reference fluxes- are tabulated and briefly discussed. An extensive list of standards is appended.
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