8. The speech processing system according to claim 7 , an operation control unit configured to execute an operation according to utterance recognized by the speech recognition unit.
7. A speech processing system comprising: a speech processing device; and a sound pickup unit, wherein the sound pickup unit picks up multi-channel speech, the speech processing device includes a sound source localization unit configured to determine a sound source position from the multi-channel speech, a reverberation suppression unit configured to suppress a reverberation component of the speech to generate dereverberated speech, a feature quantity calculation unit configured to calculate a feature quantity of the dereverberated speech, a feature quantity adjustment unit configured to multiply the feature quantity by an adjustment factor corresponding to the sound source position to calculate an adjusted feature quantity, and a speech recognition unit configured to perform speech recognition using the adjusted feature quantity, wherein the adjustment factor is calculated in advance such that a likelihood for each phoneme which is calculated by using the adjusted feature quantity calculated by multiplying the feature quantity by the adjustment factor becomes higher than a likelihood for each phoneme calculated by using the feature quantity.