Reflection sound generator

In a reflection sound generator, a first filter (18) of Finite Impulse Response type is provided with a first set of parameters representing a first distribution pattern of reflection sounds. The first distribution pattern has a time length sufficient to cover an initial reflection sound and subsequent reverberant reflection sounds. Each parameter determines a magnitude and a delay time of each reflection sound such that the reflection sounds are distributed at intervals along the time axis. The first filter (18) executes convolution operation of sample data of an input sound by the first set of parameters to generate first data containing a sequence of reflection sounds of the input sound. A second filter (20) of Finite Impulse Response type is provided with a second set of parameters representing a second distribution pattern of additional reflection sounds. The second distribution pattern has a time length shorter than that of the first distribution pattern and longer than each interval of the reflection sounds. The additional reflection sounds are arranged at intervals shorter than those of the reflection sounds. The second filter (20) executes convolution operation of the first data by the second set of parameters to generate second data containing additional reflection sounds which fill the intervals of the reflection sounds of the input sound. A large number of reflection sounds can thus be generated from a small number of parameters, and the reverberations characterics of a sound field such as room size and liveness can be set and changed easily.