| 摘要 |
<p>A noise reduction apparatus and an audio reproduction apparatus are provided to prevent howling by supplying a noise reduction audio signal obtained by phase-inverting an audio signal collected by a microphone to a speaker. A noise reduction apparatus comprises speakers, a microphone, and units for supplying a noise reduction audio signal obtained by phase-inverting an audio signal collected by the microphone to the speaker. The speakers hold a speaker unit to mix sounds emitted from the front and rear of a vibration plate of the speaker by holding units. The microphone is installed at an area where the sounds emitted from the front and rear of the vibration plate of the speaker are mixed and cancelled. The noise reduction apparatus also comprises a low pass filter(12) in order to compose the noise reduction audio signal supplied to the speaker with only low components of the audio signal collected by the microphone.</p> |
