Signal processing apparatus, method, and program

A vehicle having an interior, the vehicle comprising:

• an object located in the interior;
• a first microphone located in the interior;
• a first speaker located in the interior and configured to reproduce a sound;
• a second microphone located on the object;
• a second speaker located on the object;
• a control processing circuitry configured to perform operation and control processing for the vehicle;
• a noise control circuitry configured to control a noise in the vehicle, the noise being different from the sound;
• an input circuitry configured to enable a user to manipulate the control processing circuitry to control the noise control circuitry;
• and
• an in-vehicle network configured to connect the control processing circuitry and the noise control circuitry,
• wherein the noise control circuitry is configured to:
• generate a first noise reduction signal using an adaptive filter on a basis of a signal output from the first microphone, the first noise reduction signal to be output by the first speaker, and
• generate a second noise reduction signal using a feedback filter on a basis of a signal output from the second microphone, the second noise reduction signal to be output by the second speaker.