Park C., Kim Y.

Time-domain acoustic holography is a method for observation spatial pressure distribution in a control zone as time changes. This method gives information about the plane where we want to know from the information of measurement plane in boundary using Kirchhoff-Helmholtz integral equation. To effectively implement this method, temporal and spatial Fourier transform pairs are used. The real-time observation of pressure distribution according to time variation is important in not only algorithm development but application like mechanical system monitoring. There is sub-band coding method for embodiment of real-time signal processing. Sub-band coding is widely used for data communi-cation or tele-communication, and known as the useful for real-time large-size data transportation and playback of moving pictures or sound. In this paper, sub-band coding algorithm is examined briefly for applying the algorithm to the time-domain acoustic holography. Moreover, to verify the effectiveness, we compared with the fast Fourier transform in calculation time about simple transformation process. From the consideration, we applied sub-band coding to time-domain acoustic holography and inspected how effective the method is in real-time operation.