Sound field creation based on simultaneous equations method

In this paper, we propose a sound field creation system based on the simultaneous equations method used for active noise control systems. Conventional studies on such sound field creation mainly focus on the transaural system reproducing recorded signals at listening points. We differently purpose creating the same sound field as a target that. In the proposed system, inverse filters forming the sound field are derived by using the simultaneous equation method, which is characterized by auxiliary filters estimating the error between the created and the target sounds. The auxiliary filters can be also used for detecting the lack of taps of the inverse filters and the lack of delays given to the target sound field. The latter lack not only increases the error but also generates echoes preceding the created sound, which annoys listeners. The performance of the proposed system and the lack detection are verified by computer simulations.