ELECTRONIC DEVICE AND METHOD FOR FILTERING ANTI-VOICE INTERFERENCE

• US 20180350386A1
• Filed: 08/01/2017
• Published: 12/06/2018
• Est. Priority Date: 05/31/2017
• Status: Active Grant

• Current Assignee: Nanning Fugui Precision Industrial Co., Ltd.
• Original Assignee: Nanning Fugui Precision Industrial Co., Ltd.
• Inventors: LIN, YEN-HSIN
• Granted Patent: US 10,643,635 B2
• Time in Patent Office: Days
• CPC Class Codes: G10L 21/0224 Processing in the time domain
• CPC Class Codes: G10L 21/0232 Processing in the frequency domain
• CPC Class Codes: G10L 21/0264 characterised by the type of parameter measurement, e.g. correlation techniques, zero crossing techniques or predictive techniques
• CPC Class Codes: G10L 25/21 the extracted parameters being power information
• CPC Class Codes: G10L 25/51 for comparison or discrimination
• CPC Class Codes: G10L 25/84 for discriminating voice from noise

Abstract

An interference filtering method applied to the voice commands of a user of a device includes audio acquisition unit of device taking a first audio signal including user voice from the environment and a second audio signal from an audio output unit of a device creating competing noise. A first background audio signal is obtained by filtering a speech sound region in first audio signal, and a second background audio signal is obtained by filtering a speech sound region in second audio signal. A time difference T and a sound amplified parameter X are obtained by comparison. A third audio signal is obtained by performing time compensation, amplification, and an inverting operation on second audio signal. First audio signal and third audio signal are synthesized to produce fourth audio signal for feeding to voice recognition unit of the original user device.

Claims

1. An electronic device, comprising:

at least one processor;

a non-transitory storage medium coupled to the processor and configured to store one or more programs that are executed by the at processor, the one or more programs comprises instructions for;

acquiring, from the environment, a first audio signal including a user voice signal;

acquiring a second audio signal output from an audio output unit;

filtering a speech sound region in the first audio signal to obtain a first background audio signal, and filtering the speech sound region in the second audio signal to obtain a second background audio signal;

comparing the first background audio signal with the second background audio signal to obtain a time difference T and a sound amplification parameter X between the first background audio signal and the second background audio signal;

performing a time compensation operation, an amplification operation and an inverting operation on the second audio signal to obtain a third audio signal according to the time difference T and the sound amplified parameter X; and

synthesizing the first audio signal and the third audio signal to obtain a fourth audio signal.

2. The electronic device as claimed in claim 1, wherein the one or more programs further comprise instructions for:

extracting a first eigenvalue sequence consisting of multiple first eigenvalues corresponding to multiple sampling points in the first background audio signal, and extracting a second eigenvalue sequence consisting of multiple second eigenvalues corresponding to multiple sampling points in the second background audio signal;

calculating the time difference T between the first background audio signal and the second background audio signal based on the first eigenvalue sequence and the second eigenvalue sequence;

compensating the second background audio signal based on the time difference T; and

comparing the compensated second background audio signal with the first background audio signal to obtain the sound amplification parameter X.

3. The electronic device as claimed in claim 2, wherein the one or more programs further comprise instructions for:

setting a time interval t for calculating an energy value;

setting, based on a same starting point, n consecutive time intervals in the first background audio signal and in the second background audio signal;

obtaining a first interval energy sequence E1[n] by calculating energy values of the n consecutive time intervals in the first background audio signal;

obtaining a second interval energy sequence E2[n] by calculating energy values of the n consecutive time intervals in the second background audio signal;

obtaining a first eigenvalue sequence C1[m] by comparing all two adjacent time intervals of n consecutive time intervals in the first background audio signal;

obtaining a second eigenvalue sequence C2[m] by comparing the two adjacent fixed intervals in the second background audio signal.

4. The electronic device as claimed in claim 3, wherein the eigenvalue C_m is calculated through a formula as following:

5. The electronic device as claimed in claim 3, wherein and the one or more programs further comprise instructions for:

comparing the first eigenvalue sequence C1[m] with the second eigenvalue sequence C2[m] to obtain a value k, wherein C1_m+k=C2_m;

the time difference T is equal to a product of the time interval t and the value k.

6. The electronic device as claimed in claim 5, wherein the sound amplification parameter X is calculated through a formula as following:

7. The electronic device as claimed in claim 1, wherein the third audio signal is calculated through a formula as following:

S₃=−

XS₂(t−

T)

wherein S₃(t) is the third audio signal, S₂(t) is the second audio signal.

10. The voice interference filtering method as claimed in claim 2, wherein the one or more programs further comprise instructions for:

setting a time interval t for calculating an energy value;

setting, based on a same starting point, n consecutive time intervals in the first background audio signal and in the second background audio signal;

obtaining a first interval energy sequence E1[n] by calculating energy values of the n consecutive time intervals in the first background audio signal;

obtaining a second interval energy sequence E2[n] by calculating energy values of the n consecutive time intervals in the second background audio signal;

obtaining a first eigenvalue sequence C1[m] by comparing all two adjacent time intervals of n consecutive time intervals in the first background audio signal; and

obtaining a second eigenvalue sequence C2[m] by comparing all two adjacent time intervals of n consecutive time intervals in the second background audio signal.

11. The voice interference filtering method as claimed in claim 3, wherein the eigenvalue C_m is calculated through a formula as following:

12. The voice interference filtering method as claimed in claim 3, wherein and the one or more programs further comprises instructions for:

comparing the first eigenvalue sequence C1[m] with the second eigenvalue sequence C2[m] to obtain a value k, wherein C1_m+k=C2_m;

the time difference T is equal to a product of the time interval t and the value k.

13. The voice interference filtering method as claimed in claim 5, wherein the sound amplified parameter X is calculated through a formula as following:

14. The voice interference filtering method as claimed in claim 1, wherein the third audio signal is calculated through a formula as following:

S₃=−

XS₂(t−

T)

wherein S₃(t) is the third audio signal, S₂(t) is the second audio signal.

8. A voice interference filtering method, the method comprising:

acquiring, from the environment, a first audio signal including a user voice signal;

acquiring a second audio signal output from a audio output unit;

filtering a speech sound region in the first audio signal to obtain a first background audio signal, and filtering the speech sound region in the second audio signal to obtain a second background audio signal;

comparing the first background audio signal with the second background audio signal to obtain a time difference T and a sound amplified parameter X between the first background audio signal and the second background audio signal;

performing a time compensation operation, an amplification operation and an inverting operation on the second audio signal to obtain a third audio signal according to the time difference T and the sound amplified parameter X; and

synthesizing the first audio signal and the third audio signal to obtain a fourth audio signal.

9. The voice interference filtering method as claimed in claim 8, wherein the one or more programs further comprise instructions for:

extracting a first eigenvalue sequence consisting of multiple first eigenvalues corresponding to multiple sampling points in the first background audio signal, and extracting a second eigenvalue sequence consisting of multiple second eigenvalues corresponding to multiple sampling points in the second background audio signal;

calculating the time difference T between the first background audio signal and the second background audio signal based on the first eigenvalue sequence and the second eigenvalue sequence; and

compensating the second background audio signal based on the time difference T; and

comparing the compensated second background audio signal with the first background audio signal to obtain the sound amplified parameter X.