Audio I/O instruction interpretation for audio card

Details Audio I/O instruction interpretation for audio card Audio I/O instruction interpretation for audio card

1995-06-07

1996-05-07

MacDonald, Allen R.

395279, 395154, G10L 302, G10L 900

Patent

active

055154743

ABSTRACT:
A system and method for handling audio input/output data translates audio message in a first format from an audio application resident in a virtual machine to an audio voice in a second format which may have no exact match for the original audio message. The invention is used for audio applications which directly write to a particular hardware register of a particular audio card to communicate with an audio card which operates according to completely different principles. The translating program intercepts the audio message written in the first format including a first plurality of audio parameters, compares the audio parameters to those corresponding to a table of audio voices and selects the audio voice which corresponds to a match of the audio parameters in the audio message. If there is no exact match in the table, a variety of techniques are provided to calculate the closest or at least an acceptable audio voice for the original audio message. In one preferred embodiment, the audio parameters are a plurality of FM synthesis parameters and the audio voices are a set of generalized MIDI voices.

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IBM Technical Disclosure Bulletin, vol. 33, No. 10B, Mar. 1991, Provision For Alternate Midi Instrument-To-Midi Channel Assignments.

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