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Some New Data on Frequency Response of Magnetic Recorders for Audio

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The frequency response of a magnetic tape recorder depends on the frequency response and geometric construction of the heads; and on the magnetic and physical properties of the tape. Frequency response standards have been established by NAB and CCIR for the reproduce chain, on the basis of an -ideal- reproduce head and prescribed post-emphasis. Techniques are discussed and data is shown for calibration of the reproduce chain; the -ideal- head is seen to be producible in quantity, with care. No standards exist for the record chain, other than that it produces tapes which reproduce properly on a standard reproduce chain. Data shows that the frequency response loss of the record chain is negligible; a record alignment tape has been chosen and data is shown for the required pre-emphasis. Improved tape and heads give more easily realized pre-emphasis curves, and greater high-frequency overload capabilities.

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