Abstract
The present invention relates to a method and a background estimator in voice activity detector for updating a background noise estimate for an input signal. The input signal for a current frame is received and it is determined whether the current frame of the input signal comprises non-noise. Further an additional determination is performed whether the current frame of the non-noise input comprises noise by analyzing characteristics at least related to correlation and energy level of the input signal and background noise estimate is updated if it is determined that the current frame comprises noise.
| Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
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| Declaration Date | Declaration Reference | Declaring Company | Specification Information | ||||||
| 4G,3G | 07/10/2015 | ISLD-201510-002 | ERICSSON INC | No | Family Member | ||||
Specification Information
Specification Information
Technologies
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| US2012209604A1 | 4G,3G | 07/10/2015 | ISLD-201510-002 | ERICSSON INC | Yes | Basis Patent | ||||
| US2012209604A1 | 4G,3G | 07/10/2015 | ISLD-201510-002 | ERICSSON INC | No | Family Member | ||||
| US9202476B2 | 4G,3G | 07/10/2015 | ISLD-201510-002 | ERICSSON INC | Yes | Basis Patent | ||||
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| AU2010308597A1 | 4G,3G | 07/10/2015 | ISLD-201510-002 | ERICSSON INC | No | Family Member | ||||
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| CA2778342C | 4G,3G | 07/10/2015 | ISLD-201510-002 | ERICSSON INC | No | Family Member | ||||
| CN102667927A | 4G,3G | 07/10/2015 | ISLD-201510-002 | ERICSSON INC | No | Family Member | ||||
| CN102667927B | 4G,3G | 07/10/2015 | ISLD-201510-002 | ERICSSON INC | No | Family Member | ||||
| EP2491559A1 | 4G,3G | 07/10/2015 | ISLD-201510-002 | ERICSSON INC | No | Family Member | ||||
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| JP2013508772A | 4G,3G | 07/10/2015 | ISLD-201510-002 | ERICSSON INC | No | Family Member | ||||
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| PT2491559E | 4G,3G | 07/10/2015 | ISLD-201510-002 | ERICSSON INC | No | Family Member | ||||
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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
Use Cases
Network Optimization
Services
Claim
1. A user equipment comprising a background estimator in a Voice Activity Detector for updating a background noise estimate for an input signal, the background estimator comprising:
an input section configured to receive the input signal for a current frame, and
a processor configured to:
determine whether the current frame of the input signal comprises non-noise;
determine whether the current frame of the input signal comprises noise by analyzing characteristics related to at least one of a correlation and an energy level of the input signal, after determining that the current frame comprises non-noise; and
update the background noise estimate in response to determining that the current frame comprises noise,
wherein determining whether the current frame of the input signal comprises noise further comprises at least one of: detecting correlation and counting a number of frames from a frame last indicating a correlation event in response to determining that a first difference between an energy level of the input signal and a smooth minimum energy level is within a first range and that a second difference between a noise level of the current frame and the smooth minimum energy level is within a second range.
2. The user equipment according to claim 1, wherein the processor is configured to reduce a step size of the update of the background noise estimate and to determine when an update of the background noise estimate should be performed based on detecting correlation and counting the number of frames from a frame last indicating a correlation event.
3. The user equipment according to claim 1, wherein the processor is configured to use the determination of whether the first difference is within the first range to prevent from updating the background noise estimate based on frames with high energy compared to the smooth minimum energy level and to determine when an update of the background noise estimate should be performed.
4. The user equipment according to claim 1, wherein the processor is configured to determine when an update of the background noise estimate should be performed based on the determination of whether the second difference is within the second range.
5. The user equipment according to claim 1, wherein the first and second ranges are fixed ranges.
6. The user equipment according to claim 1, wherein the first and second ranges are adaptive ranges.
7. The user equipment according to claim 1, wherein the processor is configured to perform the determination of whether the current frame of the input signal comprises noise on all frames.
8. The user equipment according to claim 1, wherein the processor is configured to perform the determination of whether the current frame of the input signal comprises noise on non-noise frames or frames in hangover.
9. The user equipment according to claim 1, wherein the processor is configured to perform the determination of whether the current frame of the input signal comprises noise, in response to determining, after determining that the current frame comprises non-noise, that a hangover is occurring.
10. The user equipment according to claim 1,
wherein the processor is configured to determine whether the current frame of the input signal comprises non-noise by:
determining, in a first determination, whether the current frame of the input signal likely comprises voice,
wherein the processor is configured to determine whether the current frame of the input signal comprises noise after determining that the current frame comprises non-noise by:
determining, in a second determination, whether the current frame of the input signal comprises noise by analyzing the characteristics related to the at least one of the correlation and the energy level of the input signal, after determining in the first determination that the current frame likely comprises voice, and
wherein the current frame of the first and second determinations comprises the same frame.
11. A user equipment comprising:
an input section configured to receive an input signal for a current frame, and
a processor configured to:
determine whether the current frame of the input signal comprises non-noise;
determine whether the current frame of the input signal comprises noise by analyzing characteristics related to at least one of a correlation and an energy level of the input signal, after determining that the current frame comprises non-noise; and
update a background noise estimate in response to determining that the current frame comprises noise,
wherein determining whether the current frame of the input signal comprises noise further comprises at least one of: detecting correlation and counting a number of frames from a frame last indicating a correlation event in response to determining that a first difference between an energy level of the input signal and a smooth minimum energy level is within a first range and that a second difference between a noise level of the current frame and the smooth minimum energy level is within a second range.
12. The user equipment according to claim 11, wherein the processor is configured to reduce a step size of the update of the background noise estimate and to determine when an update of the background noise estimate should be performed based on detecting correlation and counting the number of frames from a frame last indicating a correlation event.
13. The user equipment according to claim 11, wherein the processor is configured to use the determination of whether the first difference is within the first range to prevent from updating the background noise estimate based on frames with high energy compared to the smooth minimum energy level and to determine when an update of the background noise estimate should be performed.
14. The user equipment according to claim 11, wherein the processor is configured to determine when an update of the background noise estimate should be performed based on the determination of whether the second difference is within the second range.
15. The user equipment according to claim 11, wherein the first and second ranges are fixed ranges.
16. The user equipment according to claim 11, wherein the first and second ranges are adaptive ranges.
17. The user equipment according to claim 11, wherein the processor is configured to perform the determination of whether the current frame of the input signal comprises noise on all frames.
18. The user equipment according to claim 11, wherein the processor is configured to perform the determination of whether the current frame of the input signal comprises noise on non-noise frames or frames in hangover.
19. The user equipment according to claim 11, wherein the processor is configured to perform the determination of whether the current frame of the input signal comprises noise, in response to determining, after determining that the current frame comprises non-noise, that a hangover is occurring.
20. The user equipment according to claim 11,
wherein the processor is configured to determine whether the current frame of the input signal comprises non-noise by:
determining, in a first determination, whether the current frame of the input signal likely comprises voice,
wherein the processor is configured to determine whether the current frame of the input signal comprises noise after determining that the current frame comprises non-noise by:
determining, in a second determination, whether the current frame of the input signal comprises noise by analyzing the characteristics related to the at least one of the correlation and the energy level of the input signal, after determining in the first determination that the current frame likely comprises voice, and
wherein the current frame of the first and second determinations comprises the same frame.
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
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.