Echo canceller device and voice telecommunications device
AssigneeMitsubishi Electric Corporation
InventorsTomoharu AWANO, Satoru FURUTA, Jun ISHII
Life of this patent
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Abstract
Disclosed is an echo canceller including: a false echo calculator that calculates false echo signals by performing a filtering operation using each of current and previous filter-coefficient groups which used by an adaptive filtering unit on a sequence of reception signals (x(n)); an evaluation value calculator that calculates evaluated values of an echo cancellation quantity on the basis of a voice-transmission signal (y(n)) and the false echo signals; a false echo selector that selects an estimated echo component from the false echo components on the basis of the evaluated values of the echo cancellation quantity; and a signal output unit (Sout) that outputs a residual signal (e(n)).
Claims10
An echo canceller device comprising:
- an adaptive filtering unit configured to perform a filtering operation using a filter-coefficient group on a sequence of reception signals input thereto, and to adaptively update the filter-coefficient group on a basis of a voice-transmission signal input thereto from a sound collector;
- a false echo calculator to acquire current and previous filter-coefficient groups which have been used by the adaptive filtering unit, and to calculate false echo signals by performing filtering operations using the current and previous filter-coefficient groups, respectively, on the sequence of reception signals;
- an evaluation value calculator to calculate evaluated values of an echo cancellation quantity corresponding to the respective false echo signals on a basis of the voice-transmission signal and the false echo signals;
- a false echo selector to select, as an estimated echo component, a false echo signal from among the false echo signals on a basis of the evaluated values of the echo cancellation quantity;
- and
- a signal output unit to output a residual signal indicating a difference between the estimated echo component and the voice-transmission signal.
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Dependencies are inferred from the claim text.