Abstract: The present document describes a capacitor circuit (100) which comprises a capacitor element (124) that is arranged between an intermediate node (122) and a reference potential (111), and a switching element (121) which comprises a first terminal that is coupled to the intermediate node (122) and a second terminal that is coupled to the reference potential (111) during the ON state of the switching element (121). Furthermore, the capacitor circuit (100) comprises a control unit (110, 210) which is configured to cause a transition from the ON state to the OFF state of the switching element (121) at a switching time instant; and, within a bias interval that is prior to the switching time instant, to transfer an electrical charge to the intermediate node (122), which is adapted to at least partially compensate an electrical charge that is transferred to the intermediated node (122) during the transition from the ON state to the OFF state of the switching element (121).

Abstract: An audio signal detector comprising: an input adapted to receive a transducer signal; an output to provide an output signal indicative of the presence of a voice component in the transducer signal; and a processor circuit adapted to estimate a noise characteristic of the transducer signal; detect a voice component of the transducer signal; adjust one or more adjustable voice-activity parameters for detecting the voice component, wherein the said one or more adjustable voice-activity parameters are adjusted based on the noise characteristic; and generate the output signal.

Abstract: An active noise cancellation (ANC) system is presented. The ANC system includes a transducer; a first microphone; and a first adaptive filter coupled to a calculator. The calculator generates an error signal based on a difference between a filtered input signal and a signal from the first microphone. The filtered input signal is based on a first transfer function estimate of the transducer-to-first microphone transfer function via a first acoustic path. The calculator updates coefficients of the first adaptive filter using the error signal and generates with the first adaptive filter a first noise-cancellation signal.

Abstract: A method of automated feedforward filter design comprising designing a feedforward filter for a system implementing active noise cancelling is described. The method includes designing the feedforward filter by determining a filter transfer function of the feedforward filter. The filter transfer function is determined using a least square method. The method also includes determining the filter transfer function by defining a target transfer function of the feedforward filter and applying the least square method using the target transfer function to determine a filter expression for the filter transfer function. The least square method is a weighted least square method.