Multirate Digital Signal Processing
Multirate Digital Signal Processing
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The EMU10K1 Digital Audio Processor is a complete audio solution for the personal computer. It fulfils its original design goal as a Microsoft DirectSound( accelerator, and with its environmental simulation capabilities, prompted the development of the Environmental Audio Extensions (EAX() to Microsoft DirectSound3D(. It has a 64-channel wavetable synthesizer with per-channel sample rate converter, digital filter, envelope generator, low frequency oscillator, and routing/mixing logic. The EMU10K1 accesses digital audio data stored in system memory via a 64-channel PCI bus-master system with virtual memory mapping identical to Intel CPU's. A powerful audio effects processor adds environmental simulation, 3-D positioning, and special effects to audio from the wavetable synthesizer and numerous other digital audio sources such as S/PDIF, I2S, and AC97. Since the EMU10K1 operates at a fixed audio sampling rate of 48kHz, it contains a generous supply of dedicated, high-quality sample rate converters. While originally designed for the consumer computer market, the EMU10K1 has high enough quality and processing power to satisfy the demands of the professional audio content developer.