发明名称 |
Time warp activation signal provider, audio signal encoder, method for providing a time warp activation signal, method for encoding an audio signal and computer programs |
摘要 |
An audio encoder has a window function controller, a windower, a time warper with a final quality check functionality, a time/frequency converter, a TNS stage or a quantizer encoder, the window function controller, the time warper, the TNS stage or an additional noise filling analyzer are controlled by signal analysis results obtained by a time warp analyzer or a signal classifier. Furthermore, a decoder applies a noise filling operation using a manipulated noise filling estimate depending on a harmonic or speech characteristic of the audio signal. |
申请公布号 |
US9431026(B2) |
申请公布日期 |
2016.08.30 |
申请号 |
US201414538735 |
申请日期 |
2014.11.11 |
申请人 |
Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V. |
发明人 |
Bayer Stefan;Disch Sascha;Geiger Ralf;Fuchs Guillaume;Neuendorf Max;Schuller Gerald;Edler Bernd |
分类号 |
G10L21/00;G10L25/93;G10L19/00;G10L21/04;G10L19/002;G10L19/028;G10L19/022;G10L19/032;G10L21/043;G10L25/90;G10L19/26 |
主分类号 |
G10L21/00 |
代理机构 |
Perkins Coie LLP |
代理人 |
Glenn Michael A.;Perkins Coie LLP |
主权项 |
1. Audio encoder for generating an encoded audio signal, comprising:
an audio signal analyzer for analyzing, whether a time frame of the audio signal comprises a harmonic or speech characteristic; a window function controller for selecting a window function depending on a harmonic or speech characteristic of the audio signal; a windower for windowing the audio signal using the selected window function to acquire a windowed frame; and a processor for further processing the windowed frame to acquire the encoded audio signal; wherein the window function controller comprises a transient detector for detecting a transient, wherein the window function controller is configured for switching from a window function for a long block to a window function for a short block, when a transient is detected and a harmonic or speech characteristic is not found by the audio signal analyzer, and for not switching to the window function for the short block, when a transient is detected and a harmonic or speech characteristic is found by the audio signal analyzer; and wherein the window function controller is configured for switching to a window function being longer than the window function for a short block and adapted to acquire a shorter left-sided overlap length with a previous window than the window function for a long block, when a transient is detected and the signal comprises a harmonic or speech characteristic, such that the window function adapted to acquire a shorter overlap length is used for windowing a speech onset or an onset of a harmonic signal. |
地址 |
Munich DE |