Handset intelligibility enhancement system using adaptive filters and signal buffers

摘要

Embodiments of the invention provide a communication device and methods for enhancing audio signals. A first audio signal buffer and a second audio signal buffer are acquired. Thereafter, the second audio signal is processed based on the linear predictive coding coefficients and gains based on noise power of the first audio signal to generate an enhanced second audio signal.

主权项

1. A communication device for generating enhanced audio signals, the communication device comprising:
an earpiece configured to output audio signals; at least one microphone configured to acquire a first audio signal buffer, wherein the first audio signal buffer comprises a noise signal; a receiver configured to receive a second audio signal buffer, wherein the second audio signal buffer comprises a speech signal received through a communication channel; and a processor configured to:
segment contents of the first audio signal buffer and the second audio signal buffer;window the segmented contents of the first audio signal buffer and the second audio signal buffer;estimate a noise power of the first audio signal buffer;control a first gain and a second gain adaptively based on the noise power, wherein the first gain is within a first predefined range and the second gain is within a second predefined range, wherein a sum of the first gain and the second gain is 100%; attenuate the second audio signal buffer with the first gain to generate a third audio signal buffer; attenuate the second audio signal buffer with the second gain to generate a fourth audio signal buffer; remove direct current components from the first audio signal buffer based on the noise power; calculate Linear Prediction Coding (LPC) coefficients of the first audio signal buffer; filter the fourth audio signal buffer by using the LPC coefficients of the first audio signal buffer to generate a fifth audio signal buffer; and add the third audio signal buffer to the fifth audio signal buffer to generate a sixth audio signal buffer, wherein the sixth audio signal buffer is outputted by the earpiece.