| 摘要 |
A waveform generation apparatus comprises a delay circuit 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 circuits each selecting one delay state from among the i kinds of delay states; a waveform generation circuit 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; a transmission path for transmitting the n pieces of binary-state signals generated by the waveform generation circuit; a waveform synthesis circuit for generating a signal having multi-valued information from the n pieces of binary-state signals transmitted through the transmission path; a phase difference detection circuit 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 path; and an offset control circuit for controlling the k pieces of selection circuit on the basis of phase difference information from the phase difference detection circuit, and adding offset values to target delays, thereby to eliminate the phase differences among the signals in the transmission circuit.
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