Pitch prediction for packet loss concealment

• US 20070219788A1
• Filed: 03/20/2006
• Published: 09/20/2007
• Est. Priority Date: 03/20/2006
• Status: Active Grant

• Current Assignee: Nytell Software LLC (Intellectual Ventures LLC)
• Original Assignee: Mindspeed Technologies Inc. (MACOM Technology Solutions Holdings, Inc.)
• Inventors: Gao, Yang
• Granted Patent: US 7,457,746 B2
• Time in Patent Office: Days
• US Class Current: 704/219
• CPC Class Codes: G10L 19/005 Correction of errors induced by the transmission channel, if related to the coding algorithm
• CPC Class Codes: G10L 19/09 Long term prediction, i.e. removing periodical redundancies, e.g. by using adaptive codebook or pitch predictor

Abstract

There is provided a pitch lag predictor for use by a speech decoder to generate a predicted pitch lag parameter. The pitch lag predictor comprises a summation calculator configured to generate a first summation based on a plurality of previous pitch lag parameters, and a second summation based on a plurality of previous pitch lag parameters and a position of each of the plurality of previous pitch lag parameters with respect to the predicted pitch lag parameter; a coefficient calculator configured to generate a first coefficient using a first equation based on the first summation and the second summation, and a second coefficient using a second equation based on the first summation and the second summation, wherein the first equation is different than the second equation; and a predictor configured to generate the predicted pitch lag parameter based on the first coefficient and the second coefficient.

Claims

1. A pitch lag predictor for use by a speech decoder to generate a predicted pitch lag parameter, the pitch lag predictor comprising:

a summation calculator configured to generate a first summation based on a plurality of previous pitch lag parameters, and further configured to generate a second summation based on a plurality of previous pitch lag parameters and a position of each of the plurality of previous pitch lag parameters with respect to the predicted pitch lag parameter;

a coefficient calculator configured to generate a first coefficient using a first equation based on the first summation and the second summation, and further configured to generate a second coefficient using a second equation based on the first summation and the second summation, wherein the first equation is different than the second equation; and

a predictor configured to generate the predicted pitch lag parameter based on the first coefficient and the second coefficient.

2. The pitch lag predictor of claim 1, wherein the first summation is defined by

3. The pitch lag predictor of claim 2, wherein n is 5.

4. The pitch lag predictor of claim 2, wherein the first equation is defined by a=(3*sum0−

sum1)/5, and the second equation is defined by b=(sum1−

2*sum0)/10.

5. The pitch lag predictor of claim 4, wherein the predictor generates the predicted pitch lag parameter by (the first coefficient+the second coefficient*n).

6. The pitch lag predictor of claim 4, wherein the first equation and the second equation are obtained by setting

7. The pitch lag predictor of claim 2, wherein the predictor generates the predicted pitch lag parameter by (the first coefficient+the second coefficient*n).

8. A pitch lag prediction method for use by a speech decoder to generate a predicted pitch lag parameter, the pitch lag prediction method comprising:

generating a first summation based on a plurality of previous pitch lag parameters;

generating a second summation based on a plurality of previous pitch lag parameters and a position of each of the plurality of previous pitch lag parameters with respect to the predicted pitch lag parameter;

calculating a first coefficient using a first equation based on the first summation and the second summation;

calculating a second coefficient using a second equation based on the first summation and the second summation, wherein the first equation is different than the second equation; and

predicting the predicted pitch lag parameter based on the first coefficient and the second coefficient.

9. The pitch lag prediction method of claim 8, wherein the first summation is defined by

10. The pitch lag prediction method of claim 9, wherein n is 5.

11. The pitch lag prediction method of claim 9, wherein the first equation is defined by a=(3*sum0−

sum1)/5, and the second equation is defined by b=(sum1−

2*sum0)/10.

12. The pitch lag prediction method of claim 11, wherein the predictor generates the predicted pitch lag parameter by (the first coefficient+the second coefficient*n).

13. The pitch lag prediction method of claim 11, wherein the first equation and the second equation are obtained by setting

14. The pitch lag prediction method of claim 9, wherein the predictor generates the predicted pitch lag parameter by (the first coefficient+the second coefficient*n).

15. A pitch lag predictor for use by a speech decoder to generate a predicted pitch lag parameter, the pitch lag predictor comprising:

a coefficient calculator configured to generate a first coefficient using a first equation based on a plurality of previous pitch lag parameters, and further configured to generate a second coefficient using a second equation based on the plurality of previous pitch lag parameters; and

a predictor configured to generate the predicted pitch lag parameter based on the first coefficient and the second coefficient.

16. The pitch lag predictor of claim 15, wherein the first equation is defined by a=(3*sum0−

sum1)/5, and the second equation is defined by b=(sum1−

2*sum0)/10, wherein

17. The pitch lag predictor of claim 16, wherein n is 5.

18. The pitch lag prediction method of claim 16, wherein the first equation and the second equation are obtained by setting