Electrical audio signal processing systems and devices – Directive circuits for microphones
Reexamination Certificate
2007-12-19
2011-12-20
Doan, Theresa T (Department: 2814)
Electrical audio signal processing systems and devices
Directive circuits for microphones
C381S091000, C381S026000
Reexamination Certificate
active
08081773
ABSTRACT:
An audio signal processing apparatus includes first, second and third omni-directional microphones each of which receives sound and generates an omni-directional audio signal and which are spaced apart by a predetermined distance, a first adder section that adds audio signals generated by the first, second and third omni-directional microphones and generates an audio signal having an omni-directivity in the whole circumferential direction, a first subtractor section that subtracts audio signals generated by the first and third omni-directional microphones and generates an audio signal having a directivity in the right-left direction, a second adder section that adds audio signals generated by the first and third omni-directional microphones, a second subtractor section that subtracts an audio signal generated by the second omni-directional microphone from the audio signal added by the second adder section and generates an audio signal having a directivity in the front-back direction, and an output section that adds the audio signal resulting from the multiplication of the audio signal having a directivity in the whole circumferential direction by a predetermined coefficient, the audio signal resulting from the multiplication of the audio signal having a directivity in the right-left direction by a predetermined coefficient, and the audio signal resulting from the multiplication of the audio signal having a directivity in the front-back direction by a predetermined coefficient and generates a unidirectional audio signal.
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Daishin Takuya
Gyotoku Kaoru
Miyake Yoshitaka
Doan Theresa T
Lerner David Littenberg Krumholz & Mentlik LLP
Sony Corporation
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