| CPC G10L 19/0208 (2013.01) [G10L 21/0324 (2013.01); G10L 21/0388 (2013.01); G10L 25/78 (2013.01); G10L 19/012 (2013.01); G10L 25/03 (2013.01)] | 16 Claims |
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1. An apparatus comprising:
at least one processor; and
at least one memory storing instructions executable by the at least one processor to perform operations to:
compute a first linear prediction gain as a ratio of a residual energy from a first linear prediction and a residual energy from a second linear prediction of a higher order than the first linear prediction for an audio signal segment;
compute a second linear prediction gain calculated as a ratio of the residual energy from the second linear prediction and residual energy from a third linear prediction of a higher order than the second linear prediction for the audio signal segment;
wherein the computing the first linear prediction gain and the computing the second linear prediction gain comprises
(a) limit the first and second linear prediction gains to take on values in a predefined interval,
(b) create at least one long term estimate of each of the first and second linear prediction gains, wherein the long term estimate is further created based on earlier first and second linear prediction gains computed for at least one earlier audio signal segment that precedes the audio signal segment,
(c) determine a difference between one of the first and second linear prediction gains and a long term estimate of the one of the first and second linear prediction gains and/or between two different long term estimates associated with the one of the first and second linear prediction gains, and
(d) low pass filter the first and second linear prediction gains; and
determine whether the audio signal segment comprises a pause based on a combined metric obtained from a combination of the first and second linear prediction gains.
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