Patent ID: 6573763
Filing Date: 2003-06-03
Classification: G06F,G11B,H04L

Abstract:
A waveform generation apparatus for transmitting n pieces of binary-state signals, and generating a signal waveform having a multi-valued state by synthesizing the n pieces of binary-state signals, said apparatus comprising:a delay means comprising i pieces of unit delay circuits connected in series, and providing i kinds of delay states by deriving signals from the respective unit delay circuits; k pieces of selection means each selecting one delay state from among the i kinds of delay states of the delay means; a waveform generation means for generating n pieces of binary-state signals in the same state, or generating n pieces of binary-state signals having a shape according to recording data supplied from the outside, on the basis of the signals having the i kinds of delay states, which are outputted from the k pieces of selection means, and the recording data supplied from the outside; a transmission means for transmitting the n pieces of binary-state signals generated by the waveform generation means; a waveform synthesis means for generating a signal having multi-valued information from the n pieces of binary-state signals transmitted by the transmission means; a phase difference detection means for detecting phase differences among the n pieces of binary-state signals in the same state, when the n pieces of binary-state signals in the same state are transmitted through the transmission means; and an offset control means for controlling the k pieces of selection means on the basis of phase difference information from the phase difference detection means, and adding offset values to target delays, thereby to eliminate the phase differences among the signals in the transmission means.