Unlock instant, AI-driven research and patent intelligence for your innovation.

Apparatus and method for post-processing an audio signal using prediction based shaping

An audio signal and signal technology, applied in the field of audio signal post-processing, can solve the problem that cannot be applied a posteriori, and achieve the effect of enhancing the time domain envelope and avoiding the click sound.

Active Publication Date: 2020-01-17
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The first class of methods needs to be inserted into the codec chain and cannot be applied a posteriori to items that have been previously encoded (e.g. archived sound material)

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Apparatus and method for post-processing an audio signal using prediction based shaping
  • Apparatus and method for post-processing an audio signal using prediction based shaping
  • Apparatus and method for post-processing an audio signal using prediction based shaping

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0097] figure 1 An apparatus for post-processing an audio signal using transient position detection is shown. In particular, as Figure 11 As shown, the device for post-processing is placed with respect to the general framework. Particularly, Figure 11 The input of the corrupted audio signal shown at 10 is shown. This input is forwarded to the transient enhancement post-processor 20, and the transient enhancement post-processor 20 outputs an enhanced audio signal, as in Figure 11 Shown at 30 in.

[0098] figure 1 The apparatus 20 for post-processing shown in includes a converter 100 for converting an audio signal into a time-frequency representation. Furthermore, the device comprises a transient position estimator 120 for estimating the temporal position of the transient portion. The transient position estimator 120 operates using a time-frequency representation as shown by the connection between the converter 100 and the transient position estimate 120, or using an a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An apparatus for post-processing (20) an audio signal, comprising: a time-spectrum- converter (700) for converting the audio signal into a spectral representation comprising a sequence of spectral frames; a prediction analyzer (720) for calculating prediction filter data for a prediction over frequency within a spectral frame; a shaping filter (740) controlled by the prediction filter data for shaping the spectral frame to enhance a transient portion within the spectral frame; and a spectrum-time-converter (760) for converting a sequence of spectral frames comprising a shaped spectral frame into a time domain.

Description

technical field [0001] The present invention relates to audio signal processing, and in particular, to audio signal post-processing in order to enhance audio quality by removing coding artifacts. Background technique [0002] Audio coding is the field of signal compression that uses psychoacoustic knowledge to deal with redundancy and irrelevance in audio signals. Under low bitrate conditions, unwanted artifacts are often introduced into the audio signal. Notable artifacts are temporal pre- and post-echoes triggered by transient signal components. [0003] Especially in block-based audio processing, these pre- and post-echoes arise due to quantization noise such as spectral coefficients in frequency-domain transform coders spread over the entire duration of a block. Semiparametric coding tools, such as gap filling, parametric spatial audio, or bandwidth extension, can also cause parametric band-limited echo artifacts, since parameter-driven adjustments typically occur with...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/03G10L19/26G10L19/025
CPCG10L19/025G10L19/03G10L19/26
Inventor 萨沙·迪施克里斯蒂安·乌勒于尔根·赫勒彼得·普罗肯帕特里克·甘普安东尼奥·卡拉姆伯尼欧蒂斯茱莉亚·哈文斯坦奥利弗·赫尔穆特丹尼尔·里奇特
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV