SOUND ATTENUATING DEVICE FOR AIR CONDITIONER
PROBLEM TO BE SOLVED: To enable sound attenuation to be carried out against random noises by using a filter having a constant in correspondence with the rotational speed of a blower fan. SOLUTION: Noise from a noise source 1 which is typically represented in an air conditioner is detected by a noise...
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Sprache: | eng |
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Zusammenfassung: | PROBLEM TO BE SOLVED: To enable sound attenuation to be carried out against random noises by using a filter having a constant in correspondence with the rotational speed of a blower fan. SOLUTION: Noise from a noise source 1 which is typically represented in an air conditioner is detected by a noise sensing microphone 2, a proper constant of the filter corresponding to the rotational speed of a blower fan at the present time is selected from a table at a memory section, and this is outputted as an audio signal to a silencing speaker 3 through a next stage amplifier 6 through the filter 5 of which characteristic is changed. Or this is outputted as an audio signal to the silencing speaker 3 through the next stage amplifier 6 through the proper filter 5 selected in correspondence with a range of the rotational speed of the blower at the present time from a plurality of filters 5 having a filter constant. The silencing speaker 3 may generate a control sound for attenuating sound in correspondence with the noise of the noise source. |
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