IBM ThinkPad 755CX, Manual

Page: 260 / 296

Advanced Information for Audio Function
Mwave MIDI Overview
Mwave MIDI Synthesizer Overview
The Mwave audio features can be a music synthesizer, creating
realistic instrument sounds from a sequence of MIDI commands.
The MIDI standard defines a very compact representation for music.
MIDI is composed of a sequence of commands representing musical
events, such as a key press on a music keyboard.
The Mwave Windows Audio Device Driver provides a sampled sound
MIDI synthesizer that exceeds the Base Multitimbral requirements of
the MPC 1 and MPC 2 specifications.
The Mwave synthesizer is enhanced with a QSound
**
process.
QSound is a signal processing technique used to deceive the
acoustic response system (hearing) of a listener. Audio from a
stereo speaker system that has been processed by QSound can give
the listener the perception that the speakers are displaced much
further to the listener's left and right than they actually are.
This is particularly useful for a personal computer system, in which
table space is limited, and a small set of speakers are located
immediately adjacent to the computer. The angular displacement of
the speakers to the listener's left and right is ordinarily not enough to
produce a decent stereo effect. But with QSound processing, the
listener can perceive sound coming from a variety of directions,
some of which are significantly further to the left and right than the
actual location of the speakers. The net result is a significantly
improved stereo effect.
To optimize the QSound effect, sit directly in front of the computer
with the speakers equally distant from both sides of the computer.
Understanding the MIDI Mapper
The MIDI Mapper is a program included with Microsoft Windows that
interacts with the Mwave Windows Synthesizer Device Driver to
control the way sounds are created on your Mwave feature. In
Windows MIDI applications allowing you to specify a MIDI output
device, select the Windows MIDI Mapper as the output device rather
than sending output to the Mwave driver directly.
The MIDI Mapper controls which of the 16 MIDI channels to send to
the Mwave feature for playback. The MPC audio specification
describes two types of synthesizers. A BASE Multitimbral
synthesizer transmits data on MIDI channels 13–16 and supports 8
244
IBM ThinkPad 755CX User's Guide