Apparatus and method for improved concealment of the adaptive codebook in a CELP-like concealment employing improved pitch lag estimation

An apparatus for generating a speech signal, comprising:

• a pitch lag estimator for estimating an estimated pitch lag, wherein the apparatus is generating the speech signal using the estimated pitch lag,
• wherein the pitch lag estimator is configured to estimate the estimated pitch lag depending on a plurality of original pitch lag values and depending on a plurality of information values,
• wherein, for each original pitch lag value of the plurality of original pitch lag values, an information value of the plurality of information values is assigned to said original pitch lag value,
• wherein the pitch lag estimator is configured to estimate the pitch lag by determining two parameters a and b, by minimizing an error function:
• e
• ⁢
• r
• ⁢
• r
• =
• ∑
• i
• =
• s
• k
• g
• p
• (
• i
• )
• ·
• (
• (
• a
• +
• b
• ·
• i
• )
• -
• P
• ⁡
• (
• i
• )
• )
• 2
• wherein a is a real number, wherein b is a real number, wherein s is a first integer, wherein k is a second integer, and wherein P(i) is the i-th original pitch lag 1value, wherein g˜(i) is the i-th pitch gain value being assigned to the i-th pitch lag value P(i).