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Apparatus and method for generating a bandwidth extended signal

A bandwidth expansion, signal technology, applied in the field of audio signal processing

Active Publication Date: 2013-04-10
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Added noise can fill in gaps, but may not sufficiently increase audio quality or subjective quality

Method used

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  • Apparatus and method for generating a bandwidth extended signal
  • Apparatus and method for generating a bandwidth extended signal
  • Apparatus and method for generating a bandwidth extended signal

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Embodiment Construction

[0039] Hereinafter, the same reference numerals are partially used for objects and functional units having the same or similar functional characteristics, and descriptions about the drawings will also be applied to other drawings to reduce repeated descriptions of the embodiments.

[0040] figure 1 A block diagram of an apparatus 100 for generating a bandwidth extended signal 122 from an input signal 102 according to an embodiment of the invention is shown. A first frequency band of the input signal 102 is represented by first resolution data, and a second frequency band is represented by second resolution data, the second resolution being lower than the first resolution. The apparatus 100 comprises a patch generator 110 connected to a combiner 120 . The patch generator 120 generates a first patch 112 from a first frequency band of the input signal 102 according to a first patching algorithm and a second patch 114 from the first frequency band of the input signal 102 accordi...

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Abstract

An apparatus for generating a bandwidth extended signal from an input signal includes a patch generator and a combiner. The first frequency band of the input signal is represented by first resolution data and the second frequency band is represented by second resolution data, wherein the second resolution is lower than the first resolution. The patch generator generates a first patch from a first frequency band of the input signal according to a first patch algorithm and generates a second patch from the first frequency band of the input signal according to a second patch algorithm. The spectral density of the second patch generated according to the second patching algorithm is higher than the spectral density of the first patch generated according to the first patching algorithm. The combiner combines the first patch, the second patch and the first frequency band of the input signal to obtain a bandwidth extended signal. The means for generating the bandwidth extended signal scales the input signal according to the first patch algorithm and according to the second patch algorithm, or scales the first patch and the second patch, so that the bandwidth extended signal satisfies the spectrum envelope criterion.

Description

technical field [0001] Embodiments according to the invention relate to audio signal processing, and in particular to an apparatus and method for generating a bandwidth extended signal from an input signal, an apparatus and method for providing a bandwidth reduced signal based on an input signal and an audio signal . Background technique [0002] Adaptive perceptual coding of audio signals provides a reduction in the actual data rate for efficient storage and transmission. Adaptive perceptual coding has gained wide acceptance in many fields. Many encoding algorithms are known, such as MPEG 1 / 2 Layer 3 ("MP3") or MPEG 4 AAC (Advanced Audio Coding). However, the encoding used for this, especially when operating at the lowest bit rates, can lead to a reduction in subjective audio quality, which is usually mainly caused by encoder-side bandwidth limitations of the audio signal to be transmitted. [0003] It is known from WO 98 57436 that in this case the audio signal is band-l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/038
CPCG10L21/038G10L19/02G10L19/00G10L21/02
Inventor 弗雷德里克·纳格尔萨沙·迪施马克斯·诺伊恩多夫斯特凡·拜尔马克·盖尔马库斯·洛瓦塞尼古拉斯·里特尔博谢乌尔里克·克雷默
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV