The present paper has discussed the properties of the oblique waves and directional random waves generated by a segmented wave generator. The theoretical formula of the oblique waves has been derived as the linear superposition of the waves radiated by the motion of each segmented wave paddle. The experiments have confirmed the validity of the formula.
　The cross-spectrum has been obtained theoretically from the formula of oblique waves and the examinations of the cross-spectrum have yielded the conclusion that
two different representations of the single and double summation models are equivalent each other as far as the number of frequency components in the simulation of wave generation signals is sufficiently large. The spatial variability of directional spreading function has been investigated by using the Bayesian model.
　The comparison of the computed spreading functions with the experimental ones has confirmed that agreement of the experimental spreading with the computed ones is good for Smax=25 but is bad for other values of Smax. One of main causes of the disagreement seems due to insufficient number of frequency components in the simulation of wave generation signals.