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A1. Because a step in the magnetism curve where it crosses the zero point and changes polarity causes the output signal to be distorted. See figure 1-1.
A2. The dc bias moves the input signal away from the step in the magnetism curve. This prevents the input signal from crossing the zero-point of the magnetism curve. See figure 1-2.
A3. With dc bias, the SNR is poor because only a small portion of the magnetism curve is straight enough to use, thus the output signal is weak compared with the natural tape hiss.
A4. Reproduces a stronger output signal. Greatly improves the SNR. Greatly reduces the natural tape hiss.
A5. Because an ac bias voltage of the proper frequency and level places the input signal away from both steps in the magnetism curve. The result is two undistorted output signals that are combined into one strong output.
A6. An input signal. A recording medium. A magnetic head.
A7. A recording medium is any material that has the ability to become magnetized, in varying amounts, in small sections along its entire length.
A8. Record the signal onto the recording medium. Reproduce the signal from the recording medium. Erase the signal from the recording medium.

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