Signal processing device, program, and range hood device
First Claim
1. A signal processing device used in combination with a sound input/output device includinga first sound input device disposed in a space in which noise output from a noise source propagates, the first sound input device being configured to collect the noise,a sound output device configured to receive a cancellation signal to output a cancelling sound for cancelling the noise to the space, anda second sound input device configured to collect a synthesis sound of the noise and the cancelling sound in the space,the signal processing device, comprising:
- a cancellation signal generator which includes a sound cancelling filter having a filter coefficient and which is configured to receive a first signal generated based on an output of the first sound input device to output the cancellation signal;
a first signal converter configured to output a second signal obtained by correcting the first signal based on a transfer function of an acoustic passage from the sound output device to the second sound input device;
a coefficient updater configured tocalculate a new filter coefficient based on the second signal, a third signal generated from an output of the second sound input device, and an update parameter relating to a magnitude of a correction amount of the filter coefficient, andupdate the filter coefficient of the sound cancelling filter to the new filter coefficient; and
a parameter adjuster configured to adjust the update parameter in response to output fluctuation of the first sound input device.
1 Assignment
0 Petitions
Accused Products
Abstract
A signal processing device includes a coefficient updater configured to calculate a filter coefficient based on a reference signal, an error signal, and an update parameter to set the filter coefficient in a noise cancelling filter. A parameter adjuster adjusts the update parameter according to fluctuation of the reference signal produced from an output of a reference microphone.
-
Citations
20 Claims
-
1. A signal processing device used in combination with a sound input/output device including
a first sound input device disposed in a space in which noise output from a noise source propagates, the first sound input device being configured to collect the noise, a sound output device configured to receive a cancellation signal to output a cancelling sound for cancelling the noise to the space, and a second sound input device configured to collect a synthesis sound of the noise and the cancelling sound in the space, the signal processing device, comprising: -
a cancellation signal generator which includes a sound cancelling filter having a filter coefficient and which is configured to receive a first signal generated based on an output of the first sound input device to output the cancellation signal; a first signal converter configured to output a second signal obtained by correcting the first signal based on a transfer function of an acoustic passage from the sound output device to the second sound input device; a coefficient updater configured to calculate a new filter coefficient based on the second signal, a third signal generated from an output of the second sound input device, and an update parameter relating to a magnitude of a correction amount of the filter coefficient, and update the filter coefficient of the sound cancelling filter to the new filter coefficient; and a parameter adjuster configured to adjust the update parameter in response to output fluctuation of the first sound input device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification