System and method for utilizing omni-directional microphones for speech enhancement
First Claim
1. A system for enhancing speech, comprising:
- a primary and secondary microphone configured to receive a primary acoustic signal and a secondary acoustic signal;
a differential microphone array (DMA) module configured to determine a cardioid primary signal and a cardioid secondary signal based on a primary electric signal converted from the primary acoustic signal and secondary electric signal converted from the secondary acoustic signal; and
an inter-microphone level difference module configured to non-linearly combine components of the cardioid primary signal and the cardioid secondary signal to obtain an inter-microphone level difference.
4 Assignments
0 Petitions
Accused Products
Abstract
Systems and methods for utilizing inter-microphone level differences (ILD) to attenuate noise and enhance speech are provided. In exemplary embodiments, primary and secondary acoustic signals are received by omni-directional microphones, and converted into primary and secondary electric signals. A differential microphone array module processes the electric signals to determine a cardioid primary signal and a cardioid secondary signal. The cardioid signals are filtered through a frequency analysis module which takes the signals and mimics a cochlea implementation (i.e., cochlear domain). Energy levels of the signals are then computed, and the results are processed by an ILD module using a non-linear combination to obtain the ILD. In exemplary embodiments, the non-linear combination comprises dividing the energy level associated with the primary microphone by the energy level associated with the secondary microphone. The ILD is utilized by a noise reduction system to enhance the speech of the primary acoustic signal.
262 Citations
26 Claims
-
1. A system for enhancing speech, comprising:
-
a primary and secondary microphone configured to receive a primary acoustic signal and a secondary acoustic signal;
a differential microphone array (DMA) module configured to determine a cardioid primary signal and a cardioid secondary signal based on a primary electric signal converted from the primary acoustic signal and secondary electric signal converted from the secondary acoustic signal; and
an inter-microphone level difference module configured to non-linearly combine components of the cardioid primary signal and the cardioid secondary signal to obtain an inter-microphone level difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A method for enhancing speech, comprising:
-
receiving a primary acoustic signal at a primary microphone and a secondary acoustic signal at a secondary microphone;
determining a cardioid primary signal and a cardioid secondary signal based on a primary electric signal converted from the primary acoustic signal and a secondary electric signal converted from the secondary acoustic signal; and
non-linearly combining components of the cardioid primary signal and cardioid secondary signal to obtain an inter-microphone level difference. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
-
-
26. A machine readable medium having embodied thereon a program, the program providing instructions for a method for enhancing speech, comprising:
-
receiving a primary acoustic signal at a primary microphone and a secondary acoustic signal at a secondary microphone;
determining a cardioid primary signal and a cardioid secondary signal based on a primary electric signal converted from the primary acoustic signal and a secondary electric signal converted from the secondary acoustic signal; and
non-linearly combining components of the cardioid primary signal and the cardioid primary signal to obtain an inter-microphone level difference.
-
Specification