Patent ID: 10419849

Abstract:
The effectiveness of calculating FIR filter coefficients for beam-forming filters for transducer arrays such as arrays of microphones or loudspeakers, for example, is increased in that the calculation is performed in two stages; namely, on the one hand, by calculating frequency domain filter weights of the beam-forming filters, i.e., coefficients describing the transfer functions of the beam-forming filters within the dimension of the frequency so as to obtain target frequency responses for the beam-forming filters, so that applying the beam-forming filters to the array approximates a desired directional selectivity, and followed by calculating the FIR filter coefficients for the beam-forming filters, i.e., of coefficients describing the impulse response of the beam-forming filters within the time domain, such that the frequency responses of the FIR beam-forming filters approximate the target frequency responses in an optimum manner in accordance with defined criteria.