SOUND EQUALIZATION USING DERIVATIVE CONSTRAINTS

A method of sound equalization for sound reproduction that yields a wi der equalized area compared with that of the conventional approach is proposed in this paper. In addition to the control of transfer functio ns from the sound sources to the original receiving points, the deriva tives of the transfer functions evaluated at the original receiving po ints are constrained to be zero. By employing these derivative constra ints, the variation of the transfer function in the vicinity of the or iginal points becomes small, resulting in a wider equalized area, whic h contributes to the robustness of the system in relation to movement of the listener. Moreover, an index useful in finding the optimum cont rol source location, which is obtained by analysing the condition numb er of the coefficient matrix of the control equation, is also describe d.