Hisashi Kodama

Sound environment simulator using a computer simulation and a method of analyzing a sound space

The present invention discloses a sound environment simulator including a sound field analyzing unit, a sound field reproducing unit, and an output unit. The sound environment analyzing unit divides the solid surfaces of a space to be analyzed into a set of sections to compute the volume of reflected sounds with a sound absorption coefficient of walls and form factors. It further computes time series data related to the arrival volume of sounds emanated from a certain sound source to the sound receiving point. An impulse response computing unit in the sound field reproducing unit transduces the time series data into an impulse response. Accordingly, the sound field reproducing unit convolutes the impulse response on a dry source in accordance with data related to a listeners position inputted from an associated virtual reality equipment to generate a reproduced sound over a headphone.

A video digital signal processor with a vector-pipeline architecture

A description is given of a 2-GOPS, 60-MIPS video digital signal processor ULSI with a vector-pipeline architecture for video CODEC systems, called the vector digital signal processor (VDSP). The VDSP uses 0.8- mu m CMOS technology and contains a discrete cosine transform (DCT) core as a special processing unit. The vector-pipeline (VP) architecture allows input vector data to be processed in various pipeline configurations. The VDSP performs motion vector detection, motion compensation, DCT/IDCT, loop filtering, quantization/inverse quantization, and variable length coding/decoding specified in CCIT H.261. The encoder and the decoder specified in the subset including the applications of CCIT H.261 (full-CIF mode at 15 frame/s or more, 64 kb/s) can be realized with only two VDSP chips, and only one VDSP chip, respectively, and thus have twice the performance of prior digital signal processors. >