Patent ID: 8559647
Filing Date: 2013-10-15
Classification: H04R

Abstract:
1. A sound emitting and collecting apparatus comprising: a sound emitting section that emits a sound based on a sound emitting signal; a sound collection section that collects a sound and generates a sound collection signal; an echo canceller having an adaptive filter for filtering the sound emitting signal and generating a pseudo echo signal, the echo canceller subtracting the pseudo echo signal from the sound collection signal to remove an echo component; a movable section on which the sound collection section is provided; a detection section that detects a movement and a move amount of the movable section; a storage section that stores a table defining a relationship between the move amount of the movable section and a filter coefficient of the adaptive filter; and a setting section, when the detection section detects the movement of the movable section, that inputs the move amount of the movable section from the detection section, reads the filter coefficient corresponding to the move amount of the movable section from the storage section, and sets the read filter coefficient in the adaptive filter, wherein the echo canceller includes a delay circuit for giving a delay to the sound emitting signal and inputting the delayed signal into the adaptive filter; wherein the table further defines the relationship between the move amount of the movable section and a delay amount of the delay circuit; and wherein the setting section reads the delay amount corresponding to the move amount of the movable section from the storage section and sets the read delay amount in the delay circuit.