Patent ID: 7889873
Filing Date: 2011-02-15
Classification: H04R

Abstract:
1. Microphone array ( 1 ) for achieving a substantially frequency-independent directivity using a plurality of microphones ( 5 ) disposed along a rectilinear array, where: the rectilinear array is at least as long as the wavelength of the lowest frequency, where a useful directivity is desired, the rectilinear array has a first end ( the microphones close to the first end ( the position of the microphones is given by the formula: wherein l is longest wavelength, for which frequency-independence is desired, N is the maximum number of microphones, l n is the position of the n′th microphone with respect to the end of the microphone array, which is intended for the highest frequencies, and d is the number of microphones per octave, the signals from the individual microphones ( that the signals from the individual microphones ( the signals after band-pass filtering are summated for obtaining the output signal.