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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