Patent ID: 8363846

Claim:
An apparatus including a frequency domain signal processor for a close talking differential microphone array with a plurality of microphones, comprising: time-to-frequency domain conversion circuitry responsive to a plurality of time domain microphone signals originating from said plurality of microphones, each with a corresponding magnitude and phase, by providing a corresponding plurality of frequency domain microphone signals with respective magnitudes and phases; filter and processing circuitry including signal magnitude detection circuitry, compensation filter circuitry and signal spectrum shaping circuitry; said signal magnitude detection circuitry being responsive to said plurality of frequency domain microphone signals by providing a corresponding plurality of frequency domain magnitude signals each of which is indicative of a respective one of said plurality of frequency domain microphone signal magnitudes; said compensation filter circuitry being configured to provide at least one compensation signal related to a difference in frequency response characteristics of respective ones of said plurality of microphones; and said signal spectrum shaping circuitry being responsive to said plurality of frequency domain magnitude signals and said at least one compensation signal by providing a frequency domain processed signal; phase recovery circuitry responsive to at least one of said frequency domain microphone signals and to said frequency domain processed signal by providing a frequency domain resultant signal having a phase related to said at least one frequency domain microphone signal; and frequency-to-time domain conversion circuitry responsive to said frequency domain resultant signal by providing a corresponding time domain resultant signal related to a combination of said time domain microphone signals.