公开(公告)号：SG142294A1

公开(公告)日：2008-05-28

申请号：SG2007175755

申请日：2007-11-07

Applicant: ST MICROELECTRONICS ASIA

Inventor： ZONG WENBO ,  WU YUAN ,  GEORGE SAPNA

Abstract: ENVIRONMENTAL EFFECTS GENERATOR FOR DIGITAL AUDIO SIGNALS An device and method of generating environmental reverberation effects for digital audio signals is presented. The device includes a reverberation controller. The reverberation controller pre-processes one or more predetermined characteristics of a first audio signal to produce a pre- processed signal and generates a plurality of delayed outputs from the pre- processed signal, each output having a predetermined delay. The reverberation controller also produces a plurality of reflection outputs from the plurality of delayed outputs and combines the plurality of reflection outputs to produce a second audio signal having a desired reverberation response.

公开(公告)号：SG135058A1

公开(公告)日：2007-09-28

申请号：SG2006009740

申请日：2006-02-14

Applicant: ST MICROELECTRONICS ASIA

Inventor： WU YUAN ,  GEORGE SAPNA

Abstract: The present invention provides a digital audio signal processing system that comprises a set of delay lines, allpass and lowpass filters to achieve the reverberation effect. The present invention further provides a method for generating and controlling digital reverberations for audio signals. The reverberation generated will have an increasing echo density in the time domain and a faster decay of high frequency signals than low frequency signals. The controlling mechanism of reverberation generation is realized through the extraction of the real environment characteristics.

公开(公告)号：SG124306A1

公开(公告)日：2006-08-30

申请号：SG200500302

申请日：2005-01-20

Applicant: ST MICROELECTRONICS ASIA

Inventor： WU YUAN ,  SAPNA GEORGE

Abstract: The present invention addresses concerns of reproducing stereo sounds with up to 5.1 speaker systems. It also addresses the issue of scalability in terms of computation and memory usage. The present invention adopts multi-band processing to allow different frequency bands to be steered separately. This advantageously achieves better channel separation when there are more than one dominant signal at any time. As the number of frequency bands increases, the ambiguity of decoding is reduced as the chances of the dominant band falling into the different frequency bands increases. The issues of multiple dominant signals is further decreased by introducing slow decay of surround signals when there is a dominant center signal and vice versa. This is based on the assumption that not all dominant signals are active at all times.