公开(公告)号：SG46972A1

公开(公告)日：1998-03-20

申请号：SG1996000356

申请日：1991-10-23

Applicant: IBM

Inventor： LISLE RONALD JAY ,  MCDONALD SCOTT B ,  WILKES MICHAEL D

IPC: G10H1/00 ,  G10H7/00

Abstract: A method and apparatus are disclosed for simultaneously outputting digital audio and MIDI synthesised music utilising a single digital signal processor. The Musical Instrumert Digital Interface (MIDI) permits music to be recorded and/or synthesised utilising a data file containing multiple serially listed program status messages and matching note on and note off messages. In contrast, digital audio is generally merely compressed, utilising a suitable data compression technique, and recorded. The audio content of such a digital recording may then be restored by decompressing the recorded data and converting that data utilising a digital-to-analog convertor. The method and apparatus of the present invention selectively and alternatively couples portions of a compressed digital audio file and a MIDI file to a single digital signal processor which alternately decompresses the digital audio file and implements a MIDI synthesiser. Decompressed audio and MIDI synthesised music are then alternately coupled to two separate buffers. The contents of these buffers are then additively mixed and coupled through a digital-to-analog convertor to an audio output device to create an output having concurrent digital audio and MIDI synthesised music.