Method and device for adaptive bandwidth pitch search in coding wideband signals

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.

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Technology	Declaration Information			Specification Information				Explicitly Disclosed	Patent Type
Technology	Declaration Date	Declaration Reference	Declaring Company	Specification Number				Explicitly Disclosed	Patent Type
5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Illustrative part: 5.7 Release: 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Illustrative part: 6.1 Release: 8 +1 -1				No	Family Member

Specification Information

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Specification Information

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Technologies

2G 3G 4G 5G

Family Information

All Granted Patents In Patent Family :	----
All Pending Patents In Patent Family :	----

SEP Database Augmented SEP Database

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Publication No	Technology	Declaration Information			Specification Information	Explicitly Disclosed	Patent Type
Publication No	Technology	Declaration Date	Declaration Reference	Declaring Company	Specification Number	Explicitly Disclosed	Patent Type
EP1125276A1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	Yes	Basis Patent
EP1125276A1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	No	Family Member
EP1125276B1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	Yes	Basis Patent
EP1125276B1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	No	Family Member
EP1125285A1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	Yes	Basis Patent
EP1125285A1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	No	Family Member
EP1125285B1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	Yes	Basis Patent
EP1125285B1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	No	Family Member
CA2347743A1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	No	Family Member
CA2347743A1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	Yes	Family Member
CA2347743C	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	No	Family Member
CA2347743C	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	Yes	Family Member
CA2347668A1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
CA2347668A1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	Yes	Family Member
CA2347668C	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
CA2347668C	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	Yes	Family Member
US6807524B1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
US6807524B1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	Yes	Family Member
CA2347667A1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	No	Family Member
CA2347667A1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	Yes	Family Member
CA2347667C	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	No	Family Member
CA2347667C	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	Yes	Family Member
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US6795805B1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	Yes	Family Member
CA2347735A1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
CA2347735A1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	Yes	Family Member
CA2347735C	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
CA2347735C	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	Yes	Family Member
US7151802B1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
US7151802B1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: ---- Release : 8 + -	Yes	Family Member
AT246836T	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
AT246834T	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
AT246389T	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
AT256910T	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
AU6455599A	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
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AU6456999A	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
AU6457099A	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
AU752229B2	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
AU6457199A	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
CA2252170A1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
DK1125284T3	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
DK1125276T3	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
DK1125285T3	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
DK1125286T3	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
EP1125284A1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
EP1125284B1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
EP1125286A1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
EP1125286B1	5G,4G,3G,2G	06/01/2010	ISLD-201001-018	VOICEAGE CORPORATION	S1 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 S2 TS Number: TS 126 190 v8.0.0 Version No: v8.0.0 Section No: Release : 8 +1 -1	No	Family Member
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Publication No	Technology	Declaration Information			Specification Information				Explicitly Disclosed	Patent Type	Status	National Phase Entries
Publication No	Technology	Declaration Date	Declaration Reference	Declaring Company	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 Optimization

Wireless communication

Services

Error correction/detection

Claim

1. A device, comprising:
an input configured to receive a pitch codevector and a target vector;
at least one frequency shaping filter configured to filter the pitch codevector to obtain at least one filtered version of the pitch codevector;
a prediction error calculator configured to determine 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;
a selector configured to compare the at least two pitch prediction errors to identify the pitch prediction error having a lowest error energy value and to select the pitch gain associated with the lowest energy value; and
an output configured to provide an indication of the selected pitch gain.', 'an input configured to receive a pitch codevector and a target vector;', 'at least one frequency shaping filter configured to filter the pitch codevector to obtain at least one filtered version of the pitch codevector;', 'a prediction error calculator configured to determine 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;', 'a selector configured to compare the at least two pitch prediction errors to identify the pitch prediction error having a lowest error energy value and to select the pitch gain associated with the lowest energy value; and', 'an output configured to provide an indication of the selected pitch gain.

2. The device according to claim 1, further comprising an indicator configured to provide an indication of the at least one frequency shaping filter used to obtain a filtered version of the pitch codevector.

3. The device 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 device according to claim 1, wherein the at least one frequency shaping filter comprises more than one frequency shaping filter configured to obtain more than one filtered version of the pitch codevector.

5. The device according to claim 1, wherein the at least one frequency shaping filter comprises a low-pass filter.

6. The device according to claim 1, wherein the at least frequency shaping filter comprises a band-pass filter.

7. The device according to claim 1, wherein the prediction error calculator comprises:
a convolution module configured to convolve the pitch codevector with a weighted synthesis filter impulse response signal to obtain a convolved pitch codevector;
an amplifier configured to multiply the convolved pitch codevector by the pitch gain value to produce an amplified convolved pitch codevector; and
a subtractor configured to subtract the amplified convolved pitch codevector from the target vector.', 'a convolution module configured to convolve the pitch codevector with a weighted synthesis filter impulse response signal to obtain a convolved pitch codevector;', 'an amplifier configured to multiply the convolved pitch codevector by the pitch gain value to produce an amplified convolved pitch codevector; and', 'a subtractor configured to subtract the amplified convolved pitch codevector from the target vector.

8. The device according to claim 7, further comprising a gain calculator configured to calculate the pitch gain value b(j) from the convolved pitch codevector using the relation b(j)=xty(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.', '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 device according to claim 1, wherein the pitch codevector is an interpolated pitch codevector having sub-sample pitch resolution

10. A device, comprising:
means for receiving a pitch codevector and a target vector;
at least one frequency shaping filter for filtering the pitch codevector to obtain at least one filtered version of the pitch codevector;
means for 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;
means for comparing the at least two pitch prediction errors to identify a pitch prediction error having a lowest error energy value;
means for selecting the pitch gain associated with the lowest energy value; and
means for providing an indication of the selected pitch gain.', 'means for receiving a pitch codevector and a target vector;', 'at least one frequency shaping filter for filtering the pitch codevector to obtain at least one filtered version of the pitch codevector;', 'means for 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;', 'means for comparing the at least two pitch prediction errors to identify a pitch prediction error having a lowest error energy value;', 'means for selecting the pitch gain associated with the lowest energy value; and', 'means for providing an indication of the selected pitch gain

11. The device according to claim 10, comprising means for providing 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, wherein the at least one frequency shaping filter comprises more than one frequency shaping filter configured 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

15. The device according to claim 10, wherein the at least one frequency shaping filter comprises a band-pass filter

16. The device according to claim 10, wherein the means for determining the at least two pitch prediction errors comprise:
means for convolving the pitch codevector with a weighted synthesis filter impulse response signal to obtain a convolved pitch codevector;
means for multiplying the convolved pitch codevector by the pitch gain value to produce an amplified convolved pitch codevector; and
means for subtracting the amplified convolved pitch codevector from the target vector.', 'means for convolving the pitch codevector with a weighted synthesis filter impulse response signal to obtain a convolved pitch codevector;', 'means for multiplying the convolved pitch codevector by the pitch gain value to produce an amplified convolved pitch codevector; and', 'means for subtracting the amplified convolved pitch codevector from the target vector

17. The device according to claim 16, further comprising means for calculating the pitch gain value b(j) from the convolved pitch codevector using the relation
b (j) =x t y (i) /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 (i) /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.19. A speech encoder, comprising:
a pitch analysis unit, wherein the pitch analysis unit is configured to
receive a pitch codevector and a target vector,
filter the pitch codevector using at least one frequency shaping filter to obtain at least one filtered version of the pitch codevector,
determine 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,
compare the at least two pitch prediction errors to identify a pitch prediction error having a lowest error energy value,
select the pitch gain associated with the lowest energy value; and
provide an indication of the selected pitch gain.', 'a pitch analysis unit, wherein the pitch analysis unit is configured to
receive a pitch codevector and a target vector,
filter the pitch codevector using at least one frequency shaping filter to obtain at least one filtered version of the pitch codevector,
determine 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,
compare the at least two pitch prediction errors to identify a pitch prediction error having a lowest error energy value,
select the pitch gain associated with the lowest energy value; and
provide an indication of the selected pitch gain.', 'receive a pitch codevector and a target vector,', 'filter the pitch codevector using at least one frequency shaping filter to obtain at least one filtered version of the pitch codevector,', 'determine 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,', 'compare the at least two pitch prediction errors to identify a pitch prediction error having a lowest error energy value,', 'select the pitch gain associated with the lowest energy value; and', 'provide an indication of the selected pitch gain.

20. A speech encoder comprising a pitch analysis unit, wherein the pitch analysis unit comprises:
an input configured to receive a pitch codevector and a target vector;', 'an input configured to receive a pitch codevector and a target vector;', 'at least one frequency shaping filter configured to filter the pitch codevector to obtain at least one filtered version of the pitch codevector;
a prediction error calculator configured to determine 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;
a selector configured to compare the at least two pitch prediction errors to identify a pitch prediction error having a lowest error energy value and to select the pitch gain associated with the lowest energy value; and
an output configured to provide an indication of the selected pitch gain.', 'a prediction error calculator configured to determine 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;', 'a selector configured to compare the at least two pitch prediction errors to identify a pitch prediction error having a lowest error energy value and to select the pitch gain associated with the lowest energy value; and', 'an output configured to provide an indication of the selected pitch gain.

21. A mobile radio telephone comprising a speech encoder, the speech encoder comprising a pitch analysis unit, the pitch analysis unit comprising:
an input configured to receive a pitch codevector and a target vector;
at least one frequency shaping filter configured to filter the pitch codevector to obtain at least one filtered version of the pitch codevector;
a prediction error calculator configured to determine 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;
a selector configured to compare the at least two pitch prediction errors to identify a pitch prediction error having a lowest error energy value and to select the pitch gain associated with the lowest energy value; and
an output configured to provide an indication of the selected pitch gain.', 'an input configured to receive a pitch codevector and a target vector;', 'at least one frequency shaping filter configured to filter the pitch codevector to obtain at least one filtered version of the pitch codevector;', 'a prediction error calculator configured to determine 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;', 'a selector configured to compare the at least two pitch prediction errors to identify a pitch prediction error having a lowest error energy value and to select the pitch gain associated with the lowest energy value; and', 'an output configured to provide an indication of the selected pitch gain.']

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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.

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