RU2012144160A - METHOD FOR ACCIDENTALLY RECEIVING SOUND WAVES - Google Patents

Abstract

A method of highly directional reception of sound waves, in which the reception is carried out by sound wave receivers located on a rigid linear basis, characterized in that at least four microphones are used as a sound receiver, the zero direction of the receiver is determined by the normal position to the linear basis of the sound source axis - the middle of the aforementioned basis with microphones, while the microphone outputs are connected in pairs to the inputs of at least three summing operational amplifiers, the output signals of which are used to form a single output signal, and the distance between the pairs of microphones is determined from the expression: moreover, in the microphone circuit, the input of the amplifier of each pair of microphones include electric filters for frequencies that correspond to the main critical frequency bands of human hearing so that in the circuit of a pair of microphones with a maximum distance L include filters for the low-frequency component of sound, and in the chain of pairs of microphones with an average and minimum distance between pairs L and L, filters are included for the medium and high-frequency components of sound ka where Δλ- phase shift at the inputs of a pair of microphones with the sound wavefront deviates from the zero position at an angle of ± α, expressed in fractions of the wavelength of the acoustic wave λ = C / f, and C fsootvetstvenno sound velocity and frequency component.

Claims (1)

A method of highly directional reception of sound waves, in which the reception is carried out by sound wave receivers located on a rigid linear basis, characterized in that at least four microphones are used as a sound receiver, the zero direction of the receiver is determined by the normal position to the linear basis of the sound source axis - the middle of the aforementioned basis with microphones, while the microphone outputs are connected in pairs to the inputs of at least three summing operational amplifiers, the output signals of which are used to form a single output signal, and the distance between pairs of microphones is determined from the expression: $$L=\frac{\Delta {\lambda }_{s\mathrm{at}}}{C_{s\mathrm{at}}}$$

, moreover, in the microphone - input circuit of the amplifier of each pair of microphones include electric filters for frequencies that correspond to the main critical frequency bands of the human hearing so that in the circuit of a pair of microphones with a maximum distance L _max include filters for the low-frequency component of sound, and in the chain of pairs of microphones with an average and the minimum distance between the pairs L _cp and L _min include filters for the medium and high frequency components of sound, respectively, where Δλ _sv is the phase shift at the inputs of a pair of microphones when the sound front deviates waves from the zero position by an angle ± α, expressed in fractions of the wavelength of the sound wave λ _sv = C _sv / f _sv , and S _sv and f _sv, respectively, the speed of sound and the frequency of the component.