Encoder, decoder and methods for encoding and decoding data segments representing a time-domain data stream
First Claim
1. An apparatus adapted 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 comprisinga segment processor adapted 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 adapted for encoding a windowed data segment in the time domain;
a frequency-domain encoder adapted 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 adapted for determining a transition indication associated with a data segment; and
a controller adapted for controlling the apparatus such that for data segments to which a first transition indication is associated, output data of the time-domain encoder is comprised by the encoded data stream and for data segments to which a second transition indication is associated, output data of the frequency-domain encoder is comprised by the encoded data stream.
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Abstract
An apparatus 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 having successive blocks of data representing successive and overlapping blocks of time-domain data samples. The apparatus includes a time-domain decoder for decoding a data segment being encoded in the time domain and a processor for processing the data segment being encoded in the frequency domain and output data of the time-domain decoder to obtain overlapping time-domain data blocks. The apparatus further includes an overlap/add-combiner for combining the overlapping time-domain data blocks to obtain a decoded data segment of the time-domain data stream.
64 Citations
14 Claims
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1. An apparatus adapted 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 adapted 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 adapted for encoding a windowed data segment in the time domain; a frequency-domain encoder adapted 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 adapted for determining a transition indication associated with a data segment; and a controller adapted for controlling the apparatus such that for data segments to which a first transition indication is associated, output data of the time-domain encoder is comprised by the encoded data stream and for data segments to which a second transition indication is associated, output data of the frequency-domain encoder is comprised by the encoded data stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. 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 to which a first transition indication is associated, output data being encoded in the time-domain is comprised by the encoded data stream and for data segments to which a second transition indication is associated, output data being encoded in the frequency domain is comprised by the encoded data stream, wherein the method is performed using a hardware apparatus, or using a computer, or using a combination of a hardware apparatus and a computer.
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14. A non-transitory computer readable medium comprising 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 to which a first transition indication is associated, output data being encoded in the time-domain is comprised by the encoded data stream and for data segments to which a second transition indication is associated, output data being encoded in the frequency domain is comprised by the encoded data stream, when the program code runs on a computer.
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Specification