Temporal noise shaping

There are discussed methods and apparatus for performing temporal noise shaping. An apparatus may comprise a temporal noise shaping, TNS, tool (11) for performing linear prediction, LP, filtering (S33, S35, S36) on an information signal including a plurality of frames; and a controller (12) configured to control the TNS tool (11) so that the TNS tool (11) performs LP filtering with: a first filter (14a) whose impulse response has a higher energy (S36); and a second filter (15a) whose impulse response has a lower energy (S35), wherein the second filter is not an identity filter, wherein the controller (12) is configured to choose (S34) between filtering (S36) with the first filter (14a), and filtering (S35) with the second filter (15a) on the basis of a frame metrics.