Kalman-filter-based adaptive microphone array noise reduction method and apparatus

A Kalman-filter-based adaptive microphone array noise reduction apparatus, wherein the apparatus comprises:

• a signal requiring module, a first reference signal generating module, a second reference signal generating module, and a signal outputting module;
• wherein
• the signal requiring module is configured to acquire an input signal at each time instance;
• wherein the input signal at each time instance contains target speech and interfering noise;
• the first reference signal generating module is configured to establish a superdirective filter model, and then filter the input signal for each time instance based on the superdirective filter model to generate a first reference signal for each time instance;
• the second reference signal generating module is configured to establish a beamforming filter model, and then filter the input signal for each time instance based on the beamforming filter model to generate a second reference signal for each time instance;
• the signal outputting module is configured to establish a Kalman filter model as well as a process equation and a measurement equation corresponding to the Kalman filter model for each time instance;
• generate a Kalman gain for each time instance based on an error corresponding to the process equation and an error corresponding to the measurement equation at each time instance to allow the Kalman filter model, based on the Kalman gain at each time instance, to eliminate the interfering noise from the first reference signal and the second reference signal for each time instance and to generate a final output signal for each time instance.