Multimedia Components; Integrated Audio; Music Synthesizer - NEC POWERMATE P - SERVICE MANUAL 1995 Service And Reference Manual

1-18 Technical Information

MULTIMEDIA COMPONENTS

Systems configured for multimedia come with audio integrated on the system board, a
quad-speed CD-ROM reader, a speaker set, and a microphone. The following briefly
describes each. Information on setting up and operating the speakers, microphone, and CD-
ROM reader is in Section 2, "Setup and Operation."

Integrated Audio

Multimedia systems come with audio components integrated on the system board. Non-
multimedia systems do not have the audio components on the system board. The audio
components include an Creative Labs Vibra 16S Sound Blaster-compatible chip, the
Yamaha OPL3 FM synthesizer chip, and a Sound Retrieval System
The system's integrated audio features the following:
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built-in 16-bit 128x oversampling Sigma-Delta Stereo Codec with 85dB S/N ratio
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built-in five-channel 16/32 step MPC compatible stereo mixer with master volume
and sample rates up to 48 Hz stereo
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dual DMA channel and built-in FIFOs for full duplex simultaneous playback and
record in 16-bit stereo
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WaveBlaster upgradeable for Wavetable synthesis
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3D sound effects
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20 voice FM synthesis.
The integrated components are compatible with Sound Blaster Pro™, Sound Blaster™ 2.0,
Ad Lib™, MPU-401, and Microsoft
The components work with the pre-installed Voyetra AudioStation audio/telephony
software and Creative Vibra 16S Windows 3.11 drivers.

Music Synthesizer

The music synthesizer in your system uses Frequency Modulation (FM) Synthesis based on
the OPL3-L synthesizer chip, the de facto standard sound source for multimedia personal
computers (MPC) and interactive entertainment products.
FM Synthesis exploits the fact that modulating one waveform with another waveform will
produce a waveform with many more harmonics than were present in the modulator or
carrier (the modulated waveform).
The frequency of modulator to carrier determines which harmonics result. The amount of
modulator determines how many of the potential harmonics result. Using integer and non-
integer ratios allow the application to create rich harmonics and inharmonics sounds.
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Windows Sound System™ for PC sound applications.
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for 3D sound effects.