Z89340 Datasheet, PDF (19/30 Pages) Zilog, Inc. – Digital Wavetable Engine

Z89340
Digital Wavetable Engine
Dual Tap-Reader
As part of the reverb algorithm, the Dual Tap-Reader Os- used to simulate early reflections. The two taps can be up
1 ^{cillator can pick additional taps in the Tape Loop delay line. to 4096 samples apart, which is about 80 ms at a 50 kHz}
The samples gathered are then scaled, summed, filtered, sampling rate. However, the reverb system is typically run
and sent to a submix register or one or more output chan- with Half-Speed Oscillators, making possible 160 ms or
nels. Note that the filtering takes place after scaling and more between taps. As many Dual Tap-Readers as de-
summing since there is only one filter in the Dual Tap- sired can be used with a single Tape Loop Oscillator pro-
Reader. The taps supplied by the Dual Tap-Reader can be viding the input (Figure 13).
Figure 13. The Dual Tap-Reader Oscillator Address Map
DS96DSP0201
PRELIMINARY
1-19