×

Refrigerating apparatus having noise attenuation

  • US 5,125,241 A
  • Filed: 03/07/1991
  • Issued: 06/30/1992
  • Est. Priority Date: 03/12/1990
  • Status: Expired due to Fees
First Claim
Patent Images

1. A refrigerating apparatus having noise, attenuation comprising:

  • a heat-insulative cabinet having a storage compartment and a machine compartment;

    a compressor provided in the machine compartment;

    sound detection means, provided in the machine compartment, for detecting noise produced by operating the compressor and converting the detected noise to a corresponding electrical signal, the detected noise having a first phase;

    an operational unit, electrically coupled to the sound detection means, for converting the electrical signal provided by the sound detection means to an acoustic signal to perform active noise control;

    a cancellation sound producer for producing, responsive to the acoustic signal, a sound having a second phase opposite to the first phase of the noise to attenuate the noise;

    a noise attenuation monitoring sound receiver for monitoring a noise attenuating effect of the cancellation sound producer and providing an attenuation value relating to the noise attenuating effect;

    an adaptive control circuit, electrically coupled between the noise attenuation monitoring sound receiver and the operational unit, for adjusting an operating condition of the operational unit by a predetermined amount when the attenuation value is out of a predetermined tolerance, the adaptive control circuit repeatedly adjusting the operating condition of the operational unit until the attenuation value comes within the predetermined tolerance; and

    means for fixing the cancellation sound producer and the noise attenuation monitoring sound receiver at a first predetermined distance apart.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×