Limes Audio Ab

Fredric Lindström

Christian Schüldt

Ingvar Claesson

The present invention relates to a device, such as an audio communication device, for combining a plurality of microphone signals x(k) into a single output signal y(k). The device comprises processing means configured to calculate control signals f(k), and control means configured to select which microphone signal x(k) or which combination of microphone signals x(k) to use as output signal y(k) based on said control signals f(k). To improve the selection, the device comprises linear prediction filters for calculating linear prediction residual signals e(k) from the plurality of microphone signals x(k), and the processing means is configured to calculate the control signals f(k) based on said linear prediction residual signals e(k).

Method and device for microphone selection

The present invention relates to a device, such as a communication device, comprising an adaptive foreground filter configured to calculate a first echo estimation signal based on a first input signal, and an adaptive background filter being more rapidly adapting than the foreground filter and configured to calculate a second echo estimation signal based on said first input signal. Embodiments of the device further comprise damping control means for controlling damping of an echo-cancelled output signal. The device in various embodiments includes that the damping control means is configured to calculate a maximum echo estimation signal using both the first and the second echo estimation signals, and control the damping of the echo-cancelled output signal based on said maximum echo estimation signal and/or a signal derived from said maximum echo estimation signal.

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Umeå, Sweden

Fredric Lindström