Headphone device, sound reproduction system, and sound reproduction method

1. A headphone device, comprising:

a sound pickup section configured to pick up an external sound;

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 said sound pickup section;

a loudspeaker;

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 said loudspeaker and includes at least the cancellation-use audio signal, wherein

said sound pickup section includes a plurality of microphones, and

said directivity setting section generates the directional pickup audio signal by compensating delays in arrival of a sound component coming from a location of a specific sound source at the plurality of microphones, with respect to audio signals obtained by sound pickup by the plurality of microphones, and combining the delay-compensated audio signals together, the delays being caused based on locations at which the plurality of microphones are arranged.

2. The headphone device according to claim 1 , further comprising:

another sound pickup section including a plurality of other microphones; and

another directivity setting section configured to generate another directional pickup audio signal by compensating delays in arrival of another sound component coming from a location of another specific sound source at the plurality of other microphones, with respect to other audio signals obtained by sound pickup by the plurality of other microphones, and combining the delay-compensated other audio signals together, the delays being caused based on locations at which the plurality of other microphones are arranged; wherein

said audio signal generation section generates an emphasis-use audio signal for emphasizing the other directional pickup audio signal, along with the cancellation-use audio signal.

3. The headphone device according to claim 1 , wherein

said sound pickup section includes two microphones each having a predetermined directional characteristic, and

said directivity setting section performs signal processing for generating the directional pickup audio signal based on audio signals outputted from the two microphones.

4. The headphone device according to claim 1 , wherein said directivity setting section sequentially generates provisional directional pickup audio signals, which are directional pickup audio signals corresponding to different directional characteristics, and determines one of the generated provisional directional pickup audio signals that satisfies a predetermined condition to be a right directional pickup audio signal.

5. The headphone device according to claim 4 , wherein said directivity setting section performs a process of determining the right directional pickup audio signal when power of the headphone device is turned on.