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The Frequency Response of Magnetic Recorders for Audio
The total frequency response of a magnetic tape recorder depends on the amplifier responses, the heads, and the tape. Response standards have been established by NAB and CCIR for the reproduce chain, using an -ideal- reproduce head and a prescribed post-emphasis. Techniques are discussed and data shown for calibrating the reproduce chain; the ideal reproduce head is physically realizable. The only standard for the record chain is that it must produce tapes which reproduce properly on a standard reproduce chain. Data show that the frequency-dependent response loss of the record chain may be made negligible. A record adjusting tape was chosen, and the required preemphasis derived. Wavelength-dependent losses are appreciable; their causes are briefly discussed and found to be inherent in the tape and record heads used at the present state of the art.
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