Microphone array having a second order directional pattern
AssigneeKnowles Electronics, LLC
InventorsDaniel Max Warren, Stephen C. Thompson
Life of this patent
Estimating the term…
Abstract
A directional microphone system is disclosed, which comprises circuitry for low pass filtering a first order signal, and circuitry for high pass filtering a second order signal. The system further comprises circuitry for summing the low pass filtered first order signal and the high pass filtered second order signal. A method of determining whether a plurality of microphones have sufficiently matched frequency response characteristics to be used in a multi-order directional microphone array is also disclosed. For a microphone array having at least three microphones, wherein one of the microphones is disposed between the other of the microphones, a method of determining the arrangement of the microphones in the array is also disclosed.
Claims15
A directional microphone system comprising:
- first, second and third omni-directional microphones, each of the microphones for converting an audible signal to a corresponding electrical signal;
- means for converting the corresponding electrical signal of each of the microphones into a single, multi-order directional signal;
- means for converting the corresponding electrical signal of two of the microphones into a single, first-order directional signal;
- a high pass filter for filtering the multi-order directional signal;
- a low pass filter for filtering the first-order directional signal;
- and
- means for summing the multi-order directional signal and the first order directional signal.
A directional microphone system comprising:
- first, second and third omni-directional microphones, each of the microphones for converting an audible signal to a corresponding electrical signal;
- means for adjusting the relative gain of the first, second and third microphones such that the magnitudes are substantially equal;
- means fix converting the corresponding electrical signal of each of the microphones into a single multi-order directional signal;
- means for converting the corresponding electrical signal of two of the microphones into a single, first-order directional signal;
- a high pass filter for filtering the multi-order directional signal;
- a low pass filter for filtering the first-order directional signal;
- and
- means for summing the filtered multi-order directional signal and the filtered first order directional signal.
A directional microphone system comprising:
- means for creating a single multi-order directional signal;
- means for creating a single, first-order directional signal;
- a high pass filter for filtering the multi-order directional signal;
- a low pass filter for filtering the first-order directional signal;
- and
- means for summing the multi-order directional signal and the first order directional signal.
A directional microphone system comprising:
- means for providing a first order signal representing a first order pattern;
- means for low pass filtering the first order signal;
- means for providing a second order signal representing a second order pattern;
- means for high pass filtering the second order signal;
- and
- means for summing the low pass filtered first order signal and the high pass filtered second order signal.
A method of providing a directional microphone signal comprising:
- providing a first order signal representing a first order pattern;
- low pass filtering the first order signal;
- providing a second order signal representing a second order pattern;
- high pass filtering the second order signal;
- and
- summing the low pass filtered first order signal and the high pass filtered second order signal.
A directional microphone system comprising:
- means for providing a first order signal representing a first order pattern;
- means for low pass filtering the first order signal;
- means for providing a multi-order signal representing a multi-order pattern;
- mans for high pass filtering the multi-order signal;
- and
- means for summing the low pass filtered fist order signal and the high pass filtered multi-order signal.
A method of providing a directional microphone signal comprising:
- providing a first order signal representing a first order pattern;
- low pass filtering the first order signal;
- providing a multi-order signal representing a multi-order pattern;
- high pass filtering the multi-order signal;
- and
- summing the low pass filtered first order signal and the high pass filtered multi-order signal.
Dependencies are inferred from the claim text.