Improved transitions in a multi-mode audio decoder

Abstract

According to a seventh aspect there is presented a decoder to decode an encoded audio frame, the audio frame being encoded using one of at least two modes. The decoder is configured to receive information indicating a selected coding mode and to determine whether the selected coding mode is a first mode, and responsive to determining that the selected coding mode is the first mode, determine whether a previous coding mode is the first mode. Responsive to the selected coding mode being the first mode and the previous coding mode not being the first mode, the decoder estimates an envelope stability measure using an energy stability and a shape stability of a previous frame. The encoded audio frame is decoded using the estimated envelope stability measure, and an energy stability of a current frame and a shape stability of a current frame is determined.

Dependencies are inferred from the claim text.