SIGNAL PROCESSING DEVICE, PROGRAM, AND RANGE HOOD SYSTEM

摘要

A silencer is to be used in combination with a range hood system to suppress noise made by a fan. In a silencing circuit, a disturbance detector detects mixing of disturbance sound to a correction signal and an error signal. When the disturbance detector detects the mixing of the disturbance sound, an updating stopper causes a coefficient updater to stop a processing of updating a filter coefficient of a silencer filter, relating to, as an object, at least a frequency band other than a frequency band of the noise.

主权项

1. A signal processing device to be used in combination with a sound input/output device, the sound input/output device comprising:
a first sound inputter that is installed in a space, where noise made by a noise source is propagated, to collect the noise; a sound outputter that is configured to output a canceling sound for canceling the noise to the space in response to receiving a canceling signal; and a second sound inputter that is configured to collect a synthesized sound of the noise and the canceling sound in the space, the signal processing device comprising:
a canceling signal generator that comprises a silencer filter with a filter coefficient, and is configured to output the canceling signal in response to receiving a first signal generated based on an output of the first sound inputter;a correction filter that is configured to generate a second signal by correcting the first signal based on a transfer function of an acoustic path from the sound outputter to the second sound inputter;a coefficient updater that is configured to calculate the filter coefficient based on the second signal and a third signal generated from an output of the second sound inputter, and update the filter coefficient of the silencer filter;a disturbance detector that is configured to detect mixing of disturbance sound, different from each of the noise and the canceling sound, to at least one of the output of the first sound inputter and the output of the second sound inputter; andan updating stopper that is configured to, when the disturbance detector detects the mixing of the disturbance sound, cause the coefficient updater to stop a processing of updating the filter coefficient, relating to at least a frequency band other than a frequency band of the noise.