Abstract
A pitch search method and device for digitally encoding a wideband signal in particular but not exclusively a speech signal in view of transmitting or storing and synthesizing this wideband sound signal. The new method and device which achieve efficient modeling of the harmonic structure of the speech spectrum uses several forms of low pass filters applied to a pitch codevector the one yielding higher prediction gain (i.e. the lowest pitch prediction error) is selected and the associated pitch codebook parameters are forwarded.
| Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
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Specification Information
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Technologies
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| Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | Status | National Phase Entries | |||||
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Technologies
Signal Processing
Product
Base Station (eNB/gNB)User Equipment (UE/Terminal)
Use Cases
Network OptimizationWireless communication
Services
Error correction/detection
Claim
1. A method comprising:
receiving a pitch codevector and a target vector;
passing the pitch codevector through at least one frequency shaping filter to obtain at least one filtered version of the pitch codevector;
determining at least two pitch prediction errors, a prediction error being representative of a difference between the target vector and a product of the pitch codevector and a pitch gain value, at least one of the pitch prediction errors being determined from a filtered version of the pitch codevector;
comparing, via a processor, the at least two pitch prediction errors to identify the pitch prediction error having a lowest error energy value;
selecting the pitch gain associated with the lowest energy value; and
providing an indication of the selected pitch gain.', 'receiving a pitch codevector and a target vector;', 'passing the pitch codevector through at least one frequency shaping filter to obtain at least one filtered version of the pitch codevector;', 'determining at least two pitch prediction errors, a prediction error being representative of a difference between the target vector and a product of the pitch codevector and a pitch gain value, at least one of the pitch prediction errors being determined from a filtered version of the pitch codevector;', 'comparing, via a processor, the at least two pitch prediction errors to identify the pitch prediction error having a lowest error energy value;', 'selecting the pitch gain associated with the lowest energy value; and', 'providing an indication of the selected pitch gain.
2. The method according to claim 1, further comprising providing an indication of the at least one frequency shaping filter used to obtain the at least one filtered version of the pitch codevector.
3. The method according to claim 2, wherein the indication of the at least one frequency shaping filter is an index representative of the at least one frequency shaping filter.
4. The method according to claim 1, wherein passing the pitch codevector through the at least one frequency shaping filter comprises passing the pitch codevector through more than one frequency shaping filter to obtain more than one filtered version of the pitch codevector.
5. The method according to claim 1, wherein passing the pitch code vector through the at least one frequency shaping filter comprises passing the pitch code vector through a low-pass filter.
6. The method according to claim 1, wherein passing the pitch code vector through the at least one frequency shaping filter comprises passing the pitch code vector through a band-pass filter.
7. The method according to claim 1, wherein determining the at least two pitch errors comprises:
convolving the pitch codevector with a weighted synthesis filter impulse response signal to obtain a convolved pitch codevector;
multiplying the convolved pitch codevector by the pitch gain value to produce an amplified convolved pitch codevector; and
subtracting the amplified convolved pitch codevector from the target vector.', 'convolving the pitch codevector with a weighted synthesis filter impulse response signal to obtain a convolved pitch codevector;', 'multiplying the convolved pitch codevector by the pitch gain value to produce an amplified convolved pitch codevector; and', 'subtracting the amplified convolved pitch codevector from the target vector.
8. The method according to claim 7, further comprising calculating the pitch gain value b(j) from the convolved pitch codevector using the relation
b (j) =x t y (j) /âx88¥y (j)âx88¥2
where j=0, 1, 2 . . . , K, and K corresponds to a number of pitch prediction errors to be determined, x is the target vector and y(j) is the convolved pitch codevector.', 'b (j) =x t y (j) /âx88¥y (j)âx88¥2', 'where j=0, 1, 2 . . . , K, and K corresponds to a number of pitch prediction errors to be determined, x is the target vector and y(j) is the convolved pitch codevector.
9. The method according to claim 1, wherein the pitch codevector is an interpolated pitch codevector having sub-sample pitch resolution
10. A device comprising:
at least one frequency shaping filter for obtaining at least one filtered version of a pitch codevector;
at least one subtractor for determining at least two pitch prediction errors, a prediction error being representative of a difference between a target vector and a product of the pitch codevector and a pitch gain value, at least one of the pitch prediction errors being determined from a filtered version of the pitch codevector;
a processor for comparing the at least two pitch prediction errors to identify the pitch prediction error having a lowest error energy value; and
a selector for selecting the pitch gain associated with the lowest energy value and for providing an indication of the selected pitch gain.', 'at least one frequency shaping filter for obtaining at least one filtered version of a pitch codevector;', 'at least one subtractor for determining at least two pitch prediction errors, a prediction error being representative of a difference between a target vector and a product of the pitch codevector and a pitch gain value, at least one of the pitch prediction errors being determined from a filtered version of the pitch codevector;', 'a processor for comparing the at least two pitch prediction errors to identify the pitch prediction error having a lowest error energy value; and', 'a selector for selecting the pitch gain associated with the lowest energy value and for providing an indication of the selected pitch gain
11. The device according to claim 10, wherein the selector further provides an indication of the at least one frequency shaping filter used to obtain the at least one filtered version of the pitch codevector
12. The device according to claim 11, wherein the indication of the at least one frequency shaping filter is an index representative of the at least one frequency shaping filter
13. The device according to claim 10, comprising more than one frequency shaping filter to obtain more than one filtered version of the pitch codevector
14. The device according to claim 10, wherein the at least one frequency shaping filter comprises a low-pass filter for filtering the pitch code vector
15. The device according to claim 10, wherein the at least one frequency shaping filter comprises a band-pass filter for filtering the pitch code vector
16. The device according to claim 10, comprising:
a convolution module for convolving the pitch codevector with a weighted synthesis filter impulse response signal to obtain a convolved pitch codevector; and
an amplifier for multiplying the convolved pitch codevector by the pitch gain value to produce an amplified convolved pitch codevector;
wherein the at least one subtractor further subtracts the amplified convolved pitch codevector from the target vector.', 'a convolution module for convolving the pitch codevector with a weighted synthesis filter impulse response signal to obtain a convolved pitch codevector; and', 'an amplifier for multiplying the convolved pitch codevector by the pitch gain value to produce an amplified convolved pitch codevector;', 'wherein the at least one subtractor further subtracts the amplified convolved pitch codevector from the target vector
17. The device according to claim 16, further comprising a gain calculator for calculating the pitch gain value b(j) from the convolved pitch codevector using the relation
b (j) =x t y (j) /âx88¥y (j)âx88¥2
where j=0, 1, 2 . . . , K, and K corresponds to a number of pitch prediction errors to be determined, x is the target vector and y(j) is the convolved pitch codevector.', 'b (j) =x t y (j) /âx88¥y (j)âx88¥2', 'where j=0, 1, 2 . . . , K, and K corresponds to a number of pitch prediction errors to be determined, x is the target vector and y(j) is the convolved pitch codevector
18. The device according to claim 10, wherein the pitch codevector is an interpolated pitch codevector having sub-sample pitch resolution.']
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SUMMARY
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The information in purple was extracted from the FrandAvenue
Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.