Encoder, Decoder and Methods for Encoding and Decoding Data Segments Representing a Time-Domain Data Stream

A method for decoding data segments representing a time-domain data stream, a data segment being encoded in the time domain or in the frequency domain, a data segment being encoded in the frequency domain comprising successive blocks of data representing successive and overlapping blocks of time-domain data samples, wherein two consecutive time-domain data blocks of which one being encoded in the frequency domain and one being encoded in the time domain comprising a time domain overlapping region, comprising:

• decoding a data segment being encoded in the time domain to acquire output data of the time-domain decoder;
• processing the data segment being encoded in the frequency domain and the output data of the time-domain decoder to acquire overlapping time-domain data blocks for the time domain overlapping region;
• and
• combining the overlapping time-domain data blocks in the time domain overlapping region to acquire a decoded data segment of the time-domain data stream for the time domain overlapping region.

A computer program comprising a program code for performing the method for decoding data segments representing a time-domain data stream, a data segment being encoded in the time domain or in the frequency domain, a data segment being encoded in the frequency domain comprising successive blocks of data representing successive and overlapping blocks of time-domain data samples, wherein two consecutive time-domain data blocks of which one being encoded in the frequency domain and one being encoded in the time domain comprising a time domain overlapping region, comprising:

• decoding a data segment being encoded in the time domain to acquire output data of the time-domain decoder;
• processing the data segment being encoded in the frequency domain and the output data of the time-domain decoder to acquire overlapping time-domain data blocks for the time domain overlapping region;
• and
• combining the overlapping time-domain data blocks in the time domain overlapping region to acquire a decoded data segment of the time-domain data stream for the time domain overlapping region,
• when the program code runs on a computer.

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

• a segment processor for providing data segments from the data stream, two consecutive data segments comprising 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 acquire 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 comprising a first transition indication output data of the time-domain encoder is comprised by the encoded data stream and for data segments comprising a second transition indication, output data of the frequency-domain encoder is comprised by the encoded data stream.

A method for generating an encoded data stream based on a time-domain data stream, the time-domain data stream comprising samples of a signal, comprising

• providing data segments from the data stream, two consecutive data segments comprising 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 acquire 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 comprising a first transition indication output data being encoded in the time-domain is comprised by the encoded data stream and for data segments comprising a second transition indication output data being encoded in the frequency domain is comprised by the encoded data stream.

A computer program comprising a program code for performing the method for generating an encoded data stream based on a time-domain data stream, the time-domain data stream comprising samples of a signal, the method comprising

• providing data segments from the data stream, two consecutive data segments comprising 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 acquire 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 comprising a first transition indication output data being encoded in the time-domain is comprised by the encoded data stream and for data segments comprising a second transition indication output data being encoded in the frequency domain is comprised by the encoded data stream,
• when the program code runs on a computer.