Patent ID: 9431026
Filing Date: 2016-08-30
CPC Classification: G10L

Claim Text:
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.