Abstract: A liquid quality management device capable of being added to a liquid supply system supplying a liquid in a storage container to a dispensing device in order to cool the liquid and dispensing the liquid into a drinking container includes: a dispensing sensor; and a control device electrically connected to the dispensing sensor and configured to perform control operation of at least one of a refrigeration machine and a stirring device provided in the dispensing device at the same time when dispensing of the liquid is started.

Abstract: There is provided a conversion device (150) configured to convert a manual liquid supply device (20) into an automated liquid supply device, the conversion device comprising an automated operation portion (51) and a mounting plate (110) made of a resin, the mounting plate including a back surface (110b), a front surface (110a), and a liquid discharging portion opening (111) passed through the front and back surfaces, and the conversion device further comprising spacers (120) configured to be interspersed between the front surface of the mounting plate and the automated operation portion, and configured to create a gap between the front surface and the automated operation portion.

Abstract: There is provided a conversion device (150) configured to convert a manual liquid supply device (20) into an automated liquid supply device, the conversion device comprising an automated operation portion (51) and a mounting plate (110) made of a resin, the mounting plate including a back surface (110b), a front surface (110a), and a liquid discharging portion opening (111) passed through the front and back surfaces, and the conversion device further comprising spacers (120) configured to be interspersed between the front surface of the mounting plate and the automated operation portion, and configured to create a gap between the front surface and the automated operation portion.

Abstract: A liquid quality management device capable of being added to a liquid supply system supplying a liquid in a storage container to a dispensing device in order to cool the liquid and dispensing the liquid into a drinking container includes: a dispensing sensor; and a control device electrically connected to the dispensing sensor and configured to perform control operation of at least one of a refrigeration machine and a stirring device provided in the dispensing device at the same time when dispensing of the liquid is started.

Abstract: A noise suppressor includes a fundamental sound source (121, 122) for generating a fundamental waveform having a predetermined frequency, and suppresses that frequency component of noise which corresponds to the predetermined frequency by generating a control sound from a signal generated by multiplying the fundamental waveform by an adaptive filter coefficient (W0, W1). The noise suppressor further includes a frequency adjusting circuit (210) for increasing or decreasing, by a predetermined amount, the frequency of the fundamental waveform output from the sound source if the phase fluctuation of the control sound detected by using the adaptive filter coefficient is larger than a predetermined threshold value. The noise suppressor has improved ability of tracking the peak frequency fluctuation of periodic noise.

Abstract: A noise suppressor includes a fundamental sound source (121, 122) for generating a fundamental waveform having a predetermined frequency, and suppresses that frequency component of noise which corresponds to the predetermined frequency by generating a control sound from a signal generated by multiplying the fundamental waveform by an adaptive filter coefficient (W0, W1). The noise suppressor further includes a frequency adjusting circuit (210) for increasing or decreasing, by a predetermined amount, the frequency of the fundamental waveform output from the sound source if the phase fluctuation of the control sound detected by using the adaptive filter coefficient is larger than a predetermined threshold value. The noise suppressor has improved ability of tracking the peak frequency fluctuation of periodic noise.