NOVEL PRE-PROCESS (AMPLITUDE DISTORTION) AND POST-PROCESS (PHASE SYNCHRONIZATION) FOR LINEAR AEC SYSTEM

• US 20130177162A1
• Filed: 01/09/2012
• Published: 07/11/2013
• Est. Priority Date: 01/09/2012
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Via Telecom Inc. (VIA Technologies)
• Inventors: Lim, Meoung-Jin, Chi, Sanghyun
• Granted Patent: US 9,343,078 B2
• Time in Patent Office: Days
• US Class Current: 381/66
• CPC Class Codes: G10L 2021/02082 the noise being echo, reverberation of the speech
• CPC Class Codes: G10L 21/0208 Noise filtering

Abstract

An acoustic processing apparatus is provided. The apparatus includes a pre-processing component, a filter and a first signal processing component. The pre-processing component compensates a non-linearity of a reference signal to generate an input signal. The filter coupled to the pre-processing component, the filter executes filtering on the input signal to generate an output signal. The first signal processing component, coupled to the pre-processing component, the reference signal obtains a gain from the first signal processing component to generate a first signal, and the first signal processing component passes the gain to the pre-processing component.

Claims

1. An audio processing apparatus, comprising:

a pre-processing component, that compensates a non-linearity of a reference signal to generate an input signal,

a filter, coupled to the pre-processing component, the filter executes filtering on the input signal to generate an output signal, and

a first signal processing component, coupled to the pre-processing component, the reference signal obtains a gain from the first signal processing component to generate a first signal, and the first signal processing component passes the gain to the pre-processing component.

2. The audio processing apparatus as recited in claim 1, wherein the pre-processing component is an amplitude distortion component that introduces amplitude distortion into the reference signal and clips the reference signal'"'"'s amplitude at a threshold.

3. The audio processing apparatus as recited in claim 2, wherein the threshold level is an inverse proportion to the gain.

4. The audio processing apparatus as recited in claim 1, further comprising:

a second signal processing component, coupled to the first signal processing component, the second signal processing component executes processing on the first signal to generate a second signal, and

a phase synchronization element, coupled to the output signal of the filter and to the second signal of the second signal processing component, wherein the phase synchronization element aligns the output signal in phase with the second signal to generate a phase synchronizing signal.

5. The audio processing apparatus as recited in claim 4, further comprising:

a summation element, coupled to the phase synchronizing signal of the phase synchronization element and to the second signal of the second signal processing component, the summation element subtracts the phase synchronizing signal from the second signal to generate a final signal.

6. The audio processing apparatus as recited in claim 5, wherein the final signal is fed back to the filter, the filter evaluates the final signal to decide weather to continue the execution.

7. The audio processing apparatus as recited in claim 1, wherein the filter is an adaptive filter, the filter is designed for tracking an echo path impulse response.

8. The audio processing apparatus as recited in claim 1, wherein said filter executes on a frame basis when it is determined that a voice signal is not present.

9. The audio processing apparatus as recited in claim 1, wherein the audio processing apparatus is disposed within a cellular telecommunication device.

10. An acoustic echo cancellation apparatus, comprising:

a pre-processing component, that compensates a non-linearity of a reference signal to generate an input signal,

a filter, coupled to the pre-processing component, the filter executes filtering on the input signal to generate an output signal,

a signal processing component, coupled to the pre-processing component, the reference signal obtaining a gain from the signal processing component to generate a first signal, and the signal processing component passing the gain to the pre-processing component, and

a phase synchronization element, coupled to the output signal of the filter and to the first signal of the signal processing component, wherein the phase synchronization element aligns the output signal in phase with the first signal to generate a phase synchronizing signal.

11. The acoustic echo cancellation apparatus as recited in claim 10, further comprising:

a summation element, coupled to the phase synchronizing signal of the phase synchronization element and to the first signal of the signal processing component, the summation element subtracts the phase synchronizing signal from the first signal to generate a final signal.

12. The acoustic echo cancellation apparatus as recited in claim 11, wherein the final signal is fed back to the filter, the filter evaluates the final signal to decide weather to continue the execution.

13. An audio processing method, comprising:

compensating a non-linearity of a reference signal, by a pre-processing component, to generate an input signal; and

executing filtering on the input signal, by a filter, to generate an output signal, wherein the reference signal obtains a gain from a first signal processing component to generate a first signal, and the first signal processing component passes the gain to the pre-processing component.

14. The audio processing method as recited in claim 13, wherein the pre-processing component is an amplitude distortion component that introduces amplitude distortion into the reference signal and clips the reference signal'"'"'s amplitude at a threshold level.

15. The audio processing method as recited in claim 14, wherein the threshold level is in inverse proportion to the gain.

16. The audio processing method as recited in claim 13, further comprising:

executing processing on the first signal, by a second signal processing component to generate a second signal; and

aligning the output signal in phase with the second signal, by a phase synchronization element, to generate a phase synchronizing signal;

wherein, the second signal processing component is coupled to the first signal processing component, and the phase synchronization is coupled to the output signal of the filter and to the second signal of the second signal processing component.

17. The audio processing method as recited in claim 16, further comprising:

subtracting the phase synchronizing signal from the second signal, by a summation element, to generate a final signal, wherein, the summation element is coupled to the phase synchronizing signal of the phase synchronization element and to the second signal of the second signal processing component.

18. The audio processing method as recited in claim 17, wherein the final signal is fed back to the filter, the filter evaluates the final signal to decide weather to continue the execution.

19. The audio processing method as recited in claim 13, wherein the filter is an adaptive filter, the filter is designed for tracking an echo path impulse response.

20. The audio processing method as recited in claim 13, wherein the filter executes on a frame basis when it is determined that a voice signal is not present.

21. The audio processing method as recited in claim 13, wherein the audio processing apparatus is disposed within a cellular telecommunication device.