| 摘要 |
<p>PURPOSE:To form an artificial sound field by promptly coping with a chronologically changing background sound field and to improve residential performance, communication environment, and work efficiency by designating a designated spectrum according to each individual's preference and providing a sound detecting part and a sound generating part together near a person. CONSTITUTION:A sound from an external part is converted into an electric variation by a sound detecting part 2, the component quantity of each frequency band of the electric variation is detected in a spectrum analyzing part 3, the detected result of the analyzing part 3 is compared with a previously stored reference spectrum, the detected result of the spectrum analyzing part 3 is corrected so that the difference between the detected result and the reference spectrum can be a fixed value or below, and the quantity of electricity in each frequency band is outputted from a spectrum correcting arithmetic circuit 5. A signal is generated with an oscillator 6, an oscillating level adjusting circuit 7, and a mixer 8 based on the output quantity of electricity, and the generated signal is converted into the sound by a sound generating part 9. The sound from the sound generating part 9 and the background sound field near the person are mixed, a new sound field having a prescribed spectrum is generated near the person, and a comfortable sound can be obtained in the sound field near an ear.</p> |
