Method and apparatus for determining inter-channel time difference parameter

1. A method for determining an inter-channel time difference (ITD) parameter, comprising:

determining a reference parameter according to a time-domain signal on a first sound channel and a time-domain signal on a second sound channel, wherein the reference parameter corresponds to a sequence of obtaining the time-domain signal on the first sound channel and the time-domain signal on the second sound channel, and wherein the time-domain signal on the first sound channel and the time-domain signal on the second sound channel correspond to a first time period;

determining a search range according to the reference parameter and a limiting value (T max ), wherein the T max is determined according to a sampling rate of the time-domain signal on the first sound channel, and wherein the search range either falls within [−T max , 0] or falls within [0, T max ]; and

performing search processing within the search range based on a frequency-domain signal on the first sound channel and a frequency-domain signal on the second sound channel to determine a first ITD parameter corresponding to the first sound channel and the second sound channel.

2. The method according to claim 1 , wherein determining the reference parameter comprises:

performing cross-correlation processing on the time-domain signal on the first sound channel and the time-domain signal on the second sound channel to determine a first cross-correlation processing value and a second cross-correlation processing value, wherein the first cross-correlation processing value is a maximum function value, within a preset range, of a cross-correlation function of the time-domain signal on the first sound channel relative to the time-domain signal on the second sound channel, and wherein the second cross-correlation processing value is a maximum function value, within the preset range, of a cross-correlation function of the time-domain signal on the second sound channel relative to the time-domain signal on the first sound channel; and

determining the reference parameter according to a value relationship between the first cross-correlation processing value and the second cross-correlation processing value.

3. The method according to claim 2 , wherein the reference parameter is an index value corresponding to a larger one of the first cross-correlation processing value and the second cross-correlation processing value.

4. The method according to claim 2 , wherein the reference parameter is an opposite number of an index value corresponding to a larger one of the first cross-correlation processing value and the second cross-correlation processing value.

5. The method according to claim 1 , wherein determining the reference parameter comprises:

performing peak detection processing on the time-domain signal on the first sound channel and the time-domain signal on the second sound channel to determine a first index value and a second index value, wherein the first index value corresponds to a maximum amplitude value of the time-domain signal on the first sound channel within a preset range, and wherein the second index value corresponds to a maximum amplitude value of the time-domain signal on the second sound channel within the preset range; and

determining the reference parameter according to a value relationship between the first index value and the second index value.

6. The method according to claim 1 , further comprising performing smoothing processing on the first ITD parameter based on a second ITD parameter, wherein the second ITD parameter is a smoothed value of an ITD parameter in a second time period, and wherein the second time period is before the first time period.

7. The method according to claim 1 , wherein the search range is [T max /2, T max ], [0, T max /2], [−T max , −T max /2], or [−T max /2, 0].

8. An apparatus for determining an inter-channel time difference (ITD) parameter, comprising:

a memory comprising instructions; and

a processor coupled to the memory, wherein the instructions cause the processor to be configured to:

determine a reference parameter according to a time-domain signal on a first sound channel and a time-domain signal on a second sound channel, wherein the reference parameter corresponds to a sequence of obtaining the time-domain signal on the first sound channel and the time-domain signal on the second sound channel, and wherein the time-domain signal on the first sound channel and the time-domain signal on the second sound channel correspond to a first time period;

determine a search range according to the reference parameter and a limiting value (T max ), wherein the T max is determined according to a sampling rate of the time-domain signal on the first sound channel, and wherein the search range either falls within [−T max , 0] or falls within [0, T max ]; and

perform search processing within the search range based on a frequency-domain signal on the first sound channel and a frequency-domain signal on the second sound channel to determine a first ITD parameter corresponding to the first sound channel and the second sound channel.

9. The apparatus according to claim 8 , wherein the instructions further cause the processor to be configured to:

perform cross-correlation processing on the time-domain signal on the first sound channel and the time-domain signal on the second sound channel to determine a first cross-correlation processing value and a second cross-correlation processing value; and

determine the reference parameter according to a value relationship between the first cross-correlation processing value and the second cross-correlation processing value,

wherein the first cross-correlation processing value is a maximum function value, within a preset range, of a cross-correlation function of the time-domain signal on the first sound channel relative to the time-domain signal on the second sound channel, and

wherein the second cross-correlation processing value is a maximum function value, within the preset range, of a cross-correlation function of the time-domain signal on the second sound channel relative to the time-domain signal on the first sound channel.

10. The apparatus according to claim 9 , wherein the reference parameter is an index value corresponding to a larger one of the first cross-correlation processing value and the second cross-correlation processing value.

11. The apparatus according to claim 9 , wherein the reference parameter is an opposite number of an index value corresponding to a larger one of the first cross-correlation processing value and the second cross-correlation processing value.

12. The apparatus according to claim 8 , wherein the instructions further cause the processor to be configured to:

perform peak detection processing on the time-domain signal on the first sound channel and the time-domain signal on the second sound channel to determine a first index value and a second index value; and

determine the reference parameter according to a value relationship between the first index value and the second index value,

wherein the first index value corresponds to a maximum amplitude value of the time-domain signal on the first sound channel within a preset range, and

wherein the second index value corresponds to a maximum amplitude value of the time-domain signal on the second sound channel within the preset range.

13. The apparatus according to claim 8 , wherein the instructions further cause the processor to be configured to perform smoothing processing on the first ITD parameter based on a second ITD parameter, wherein the second ITD parameter is a smoothed value of an ITD parameter in a second time period, and wherein the second time period is before the first time period.

14. The apparatus according to claim 8 , wherein the search range is [T max /2, T max ], [0, T max /2], [−T max , −T max /2], or [−T max /2, 0].

15. A non-transitory computer readable storage medium, tangibly embodying computer program code, in which, when executed by a computer, causes the computer to perform a method comprising:

determining a reference parameter according to a time-domain signal on a first sound channel and a time-domain signal on a second sound channel, wherein the reference parameter corresponds to a sequence of obtaining the time-domain signal on the first sound channel and the time-domain signal on the second sound channel, and wherein the time-domain signal on the first sound channel and the time-domain signal on the second sound channel correspond to a first time period;

determining a search range according to the reference parameter and a limiting value (T max ), wherein the T max is determined according to a sampling rate of the time-domain signal on the first sound channel, and wherein the search range either falls within [−T max , 0] or falls within [0, T max ]; and

performing search processing within the search range based on a frequency-domain signal on the first sound channel and a frequency-domain signal on the second sound channel to determine a first inter-channel time difference (ITD) parameter corresponding to the first sound channel and the second sound channel.

16. The non-transitory computer readable storage medium according to claim 15 , wherein determining the reference parameter comprises:

performing cross-correlation processing on the time-domain signal on the first sound channel and the time-domain signal on the second sound channel to determine a first cross-correlation processing value and a second cross-correlation processing value, wherein the first cross-correlation processing value is a maximum function value, within a preset range, of a cross-correlation function of the time-domain signal on the first sound channel relative to the time-domain signal on the second sound channel, and wherein the second cross-correlation processing value is a maximum function value, within the preset range, of a cross-correlation function of the time-domain signal on the second sound channel relative to the time-domain signal on the first sound channel; and

determining the reference parameter according to a value relationship between the first cross-correlation processing value and the second cross-correlation processing value.

17. The non-transitory computer readable storage medium according to claim 16 , wherein the reference parameter is an index value corresponding to a larger one of the first cross-correlation processing value and the second cross-correlation processing value.

18. The non-transitory computer readable storage medium according to claim 16 , wherein the reference parameter is an opposite number of an index value corresponding to a larger one of the first cross-correlation processing value and the second cross-correlation processing value.

19. The non-transitory computer readable storage medium according to claim 15 , wherein determining the reference parameter comprises:

performing peak detection processing on the time-domain signal on the first sound channel and the time-domain signal on the second sound channel to determine a first index value and a second index value, wherein the first index value corresponds to a maximum amplitude value of the time-domain signal on the first sound channel within a preset range, and wherein the second index value corresponds to a maximum amplitude value of the time-domain signal on the second sound channel within the preset range; and

determining the reference parameter according to a value relationship between the first index value and the second index value.

20. The non-transitory computer readable storage medium according to claim 15 , further comprising performing smoothing processing on the first ITD parameter based on a second ITD parameter, wherein the second ITD parameter is a smoothed value of an ITD parameter in a second time period, and wherein the second time period is before the first time period.