This paper describes an investigation of the SAW beam diffraction on LiNbO₃ crystal by the frequency-translated-holographic technique, which allows direct observation of SAW amplitude distributions. The observed diffraction patterns are found to change as a function of excitation frequencies, and to agree well with the theoretical amplitude distributions of the SAW's emitted from the multiple finger pairs of an interdigital transducer. The method of the angular spectrum of plane waves was used for the theoretical computations.

The purpose of the present note is to provide a necessary and sufficient condition in order that strongly connected group-matrix type automata, whose orders are prime, may be regular. Further, as an applications, a problem concerning factor automata of a strongly connected automaton will be discussed.

A synthesis technique is presented for the multiple feedback (MF) active RC realization of transfer functions having complex frequency transmission zeros, and a biquadratic block in the MF structure is proposed, which is suitable for realizing the internal transfer function having complex zeros and poles.

This paper describes that in numerical solutions of electrostatic field problems, the difference equations which are derived from two processes to approximate the field equation will be different from each other when unequal mesh size is used. Also accuracies are discussed for cylindrical condenser.

A digital technique for evaluating the half-power band-width of a resonance system is presented. It is based on the lateral shifting operation of the z-transform of the samples sequence on the z-plane. The shifting operation is carried out by using the binomial coefficients.