Patent ID: 11946968
Assignee: BLANCCO TECHNOLOGY GROUP IP OY
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 12:
13. The method according to claim 1, wherein the first actuator is a first loudspeaker, the first sensor is a first microphone, the pre-defined control signal is an audio signal and the method further comprises performing before the feeding of the predefined control signal: measuring a background audio signal using the first microphone when the first loudspeaker is inactive; determining based on the measured background audio signal whether one or more primary frequencies primarily used for transmission via the first loudspeaker and for reception via the first microphone are occupied; selecting, in response to at least one primary frequency of the one or more primary frequencies being determined to be occupied, a secondary frequency determined to be unoccupied for each of said at least one primary frequency determined to be occupied based on the measured background audio signal; and forming the pre-defined control signal, wherein the pre-defined control signal is formed so as to comprise one or more frequencies determined to be unoccupied.