| 摘要 |
PROBLEM TO BE SOLVED: To increase the storage capacity of a recording medium by making preambles used on the recording medium short. SOLUTION: The circuit which controls the gain of an amplifier amplifying an information signal has two buffers for storing two samples of the amplified information signal and also has a gain determining circuit coupled with the buffers. This gain determining circuit generates gain control for shifting the amplitude of the information signal amplified by the amplifier according to the two samples to or toward a specific amplitude. This circuit is able to give initial rough gain control to a read signal amplifier for a disk drive read channel. This initial control accelerates the more speedy stabilization of the amplifier gain in the beginning of a data sector and the speeded-up stabilization allows the data sector to have a shorter preamble, so that a disk can have higher data storage density.
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