Detecting speech frames belonging to a low energy sequence
First Claim
1. A method for detecting speech frames belonging to a low energy sequence of a speech signal, said method comprising:
- determining a speech energy in a current speech frame;
estimating a speech energy level based on a speech energy in a plurality of speech frames;
if said estimated speech energy level deviates at least by a predetermined amount from a predetermined nominal speech energy level, scaling said determined speech energy in said current speech frame; and
deciding that said current speech frame belongs to a low energy sequence, if said, potentially scaled, frame energy is lower than a predetermined low energy threshold value.
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Accused Products
Abstract
In order to enable a detection of speech frames belonging to a low energy sequence of a speech signal, it is proposed that a speech energy in a current speech frame is determined. Further, a speech energy level is estimated based on a speech energy in a plurality of speech frames. The determined speech energy in the current speech frame is scaled, if the estimated speech energy level deviates at least by a predetermined amount from a predetermined nominal speech energy level. Then, it can be decided that the current speech frame belongs to a low energy sequence, if the, potentially scaled, frame energy is lower than a predetermined low energy threshold value.
44 Citations
25 Claims
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1. A method for detecting speech frames belonging to a low energy sequence of a speech signal, said method comprising:
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determining a speech energy in a current speech frame;
estimating a speech energy level based on a speech energy in a plurality of speech frames;
if said estimated speech energy level deviates at least by a predetermined amount from a predetermined nominal speech energy level, scaling said determined speech energy in said current speech frame; and
deciding that said current speech frame belongs to a low energy sequence, if said, potentially scaled, frame energy is lower than a predetermined low energy threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An encoding module comprising:
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a frame energy detector adapted to determine a speech energy in a current speech frame of a speech signal;
a speech level estimator adapted to estimate a speech energy level based on a speech energy in a plurality of speech frames;
a scaling portion adapted to scale a speech energy in a current speech frame determined by said frame energy detector, if a speech energy level estimated by said speech level estimator deviates at least by a predetermined amount from a predetermined nominal speech energy level; and
a selector adapted to decide that said current speech frame belongs to a low energy sequence, if a, potentially scaled, frame energy provided by said scaling portion is lower than a predetermined low energy threshold value. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. An encoding module comprising:
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means for determining a speech energy in a current speech frame of a speech signal;
means for estimating a speech energy level based on a speech energy in a plurality of speech frames;
means for scaling a determined speech energy in a current speech frame, if an estimated speech energy level deviates at least by a predetermined amount from a predetermined nominal speech energy level; and
means for deciding that said current speech frame belongs to a low energy sequence, if a, potentially scaled, frame energy is lower than a predetermined low energy threshold value.
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22. An electronic device comprising:
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a frame energy detector adapted to determine a speech energy in a current speech frame of a speech signal;
a speech level estimator adapted to estimate a speech energy level based on a speech energy in a plurality of speech frames;
a scaling portion adapted to scale a speech energy in a current speech frame determined by said frame energy detector, if a speech energy level estimated by said speech level estimator deviates at least by a predetermined amount from a predetermined nominal speech energy level; and
a selector adapted to decide that said current speech frame belongs to a low energy sequence, if a, potentially scaled, frame energy provided by said scaling portion is lower than a predetermined low energy threshold value. - View Dependent Claims (23, 24)
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25. A software program product in which a software code for detecting speech frames belonging to a low energy sequence of a speech signal is stored, said software code realizing the following steps when running in a processing unit of an electronic device:
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determining a speech energy in a current speech frame;
estimating a speech energy level based on a speech energy in a plurality of speech frames;
if said estimated speech energy level deviates at least by a predetermined amount from a predetermined nominal speech energy level, scaling said determined speech energy in said current speech frame; and
deciding that said current speech frame belongs to a low energy sequence, if said, potentially scaled, frame energy is lower than a predetermined low energy threshold value.
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Specification