Headphone device, sound reproduction system, and sound reproduction method

A headphone system, comprising:

• a headphone device;
• and
• a signal processing device;
• wherein
• said headphone device includes
• a sound pickup section configured to pick up an external sound, and
• a loudspeaker;
• and
• said signal processing device includes
• a directivity setting section configured to generate a directional pickup audio signal, which is an audio signal obtained by picking up the external sound with a desired directional characteristic, based on an audio signal outputted from the sound pickup section,
• an audio signal generation section configured to generate a cancellation-use audio signal for attenuating the directional pickup audio signal based on the directional pickup audio signal, and
• a driving signal generation section configured to generate a driving signal, which is an audio signal for driving the loudspeaker and includes at least the cancellation-use audio signal.

A sound reproduction method, comprising the steps of:

• a sound pickup section picking up an external sound and outputting an audio signal;
• generating a directional pickup audio signal, which is an audio signal obtained by picking up the external sound with a desired directional characteristic, based on the audio signal;
• generating a cancellation-use audio signal for attenuating the directional pickup audio signal based on the directional pickup audio signal;
• generating a driving signal, which is an audio signal for driving a loudspeaker and includes at least the cancellation-use audio signal;
• and
• outputting a sound based on the driving signal.