Control Circuit for Active Noise Control and Method for Active Noise Control

摘要

Control circuit for active noise control, ANC, coupled to a speaker (SP) generating a speaker signal (SPS) based on an amplified audio signal and to an ANC microphone (MIC) generating a disturbed audio signal based on ambient noise (NOISE) and the speaker signal (SPS). The control circuit comprises a first mixer (M1) generating an intermediate audio signal by superposing an audio signal (IN) and a first compensation signal (CS1), a first amplifier (AMP1) generating the amplified audio signal based on the intermediate audio signal and a compensation unit (CU) generating a second compensation signal (CS2) based on the audio signal (IN). A tuning unit (TUNE) generates a compensated audio signal based on the disturbed audio signal and the second compensation signal (CS2). An ANC filter (ANCF) coupled to the tuning unit (TUNE) generates the first compensation signal by applying filter operations to the compensated audio signal.