Patent ID: 8477956

Claim:
A howling suppression device which suppresses a howling component included in an input signal, said howling suppression device comprising: a delay unit which delays the input signal so as to output the delayed input signal as a reference signal; a signal separation unit including an adaptive filter which extracts a periodic signal component from the reference signal according to an adaptively updated filter coefficient that is adaptively updated by said adaptive filter; a howling detection unit configured to detect an occurrence of howling using at least a signal of the periodic signal component output from said adaptive filter; and a howling suppression unit including: a first suppression filter which (i) obtains, according to timing based on when said howling detection unit detects the occurrence of the howling, the filter coefficient according to which said adaptive filter extracts the periodic signal component at a point in time when said howling detection unit detects the occurrence of the howling, and (ii) extracts the periodic signal component from the reference signal based on the obtained filter coefficient; and a first subtractor which subtracts the periodic signal component extracted by said first suppression filter from the input signal so as to output a signal obtained by the subtraction.