Digital signal recorder

摘要

A digital signal recorder affixes m bits as a prefix to an input information word of n bits to be encoded into a channel word of n+m bits in parallel. The channel word is divided by a common divisor of the period of the channel word of n+m bits and the period of a pilot signal track pattern useful for read head tracking during playback of the recorded data, to form a series of channel word segments. Spectrum data for all possible values or bit patterns of the divided channel word segments, relative to the track patterns, are stored in look-up tables. The channel word having the frequency characteristic of the desired track pattern is selected by accessing the look-up table using the divided channel word (channel word segment) to provide address bits, so that the selected channel word can be processed, selected and recorded in real time.