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Z89340 数据表(PDF) 17 Page - Zilog, Inc.

部件名 Z89340
功能描述  Digital Wavetable Engine
PDF  30 Pages
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制造商  ZILOG [Zilog, Inc.]
网页  http://www.zilog.com
标志 ZILOG - Zilog, Inc.

Z89340 数据表(HTML) 17 Page - Zilog, Inc.

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Z89340
Digital Wavetable Engine
DS96DSP0201
P R E L I M I N A R Y
1-17
1
ADPCM Oscillator
The ADPCM Oscillator works in much the same way as the
Sample Loop and Wavetable Oscillators. The main differ-
ences are that, due to the nature of ADPCM, the frequency
cannot be negative (you cannot with the Sample Loop Os-
cillator you can play a sound backwards, with Wavetable
Mode and ADPCM), and ADPCM will not allow playing a
sound faster than the sampling rate at which it is stored in
ROM. Also, the wavetable synthesis extensions of the
Wavetable Mode Oscillator are not available. The Z89340
handles IMA/DVI format ADPCM in 4- and 8-bit modes.
The ADPCM Oscillator provides a way to compact the da-
ta, but with some degree of sound degradation. However,
in many applications the trade-off may be worthwhile. (Re-
fer to Figure 11 for ADPCM-IMA/DVI Oscillator Address
Map).
Figure 11. The ADPCM-IMA/DVI Oscillator Address Map



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