Encoder, decoder and methods for encoding and decoding data segments representing a time-domain data stream

An apparatus for generating an encoded data stream based on a time-domain data stream, the time-domain data stream having samples of a signal, the apparatus comprising

• a segment processor for providing data segments from the data stream, two consecutive data segments having a first or a second overlapping region, the second overlapping region being smaller than the first overlapping region;
• a time-domain encoder for encoding a windowed data segment in the time domain;
• a frequency-domain encoder for applying weights to samples of the time-domain data stream according to a first or second windowing function to obtain a windowed data segment, the first and second windowing functions being adapted to the first and second overlapping regions, the frequency-domain encoder being adapted for encoding a windowed data segment in the frequency domain;
• a time-domain data analyzer for determining a transition indication associated with a data segment;
• and
• a controller for controlling the apparatus such that for data segments having a first transition indication output data of the time-domain encoder is included in the encoded data stream and for data segments having a second transition indication, output data of the frequency-domain encoder is included in the encoded data stream.

Method for generating an encoded data stream based on a time-domain data stream, the time-domain data stream having samples of a signal, comprising the steps of

• providing data segments from the data stream, two consecutive data segments having a first or a second overlapping region, the second overlapping region being smaller than the first overlapping region;
• determining a transition indication associated with the data segments;
• encoding a data segment in the time domain, and/or applying weights to samples of the time-domain data stream according to a first or a second windowing function to obtain a windowed data segment, the first and second windowing functions being adapted to the first and second overlapping regions and encoding the windowed data segment in the frequency domain and;
• controlling such that for data segments having a first transition indication output data being encoded in the time-domain is included in the encoded data stream and for data segments having a second transition indication output data being encoded in the frequency domain is included in the encoded data stream.