CF5762AB0 datasheet(9/10 Pages) NPC

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CF5762AB0

NIPPON PRECISION CIRCUITS INC.—9

Dual Pitch Synthesis (DPS)

Separate A and B pitches are processed by reading a

single set of waveform data at slightly varying fre-

quencies to create a chorus effect, to which an enve-

lope functions are added, and then the resulting

pitches are mixed (added) to generate output pitches.

Number of Simultaneous Pitches

There are a maximum of 2 pitches with 2 pitch col-

ors that can be generated simultaneously. These are

the A and B normal melody (normal waveform) and

chorus (chorus waveform) pitches.

Dynamic Range

The range of pitches stored in Note-ROM is C3 to C6.

Waveform Data

There are 2 waveform data sets that are stored in

Wave-ROM: Wave data 0 and Wave data 1. When

WSEL is LOW or open circuit, pitch synthesis uses

the preassigned waveform data sets. When WSEL is

HIGH, all pitch synthesis uses the wave data 1 set.

If the waveform data assignment is changed mid

melody, subsequent pitch sounds generated will

change because the data waveform used for pitch

synthesis changes immediately in response to

WSEL, even during pitch synthesis.

Figure 5. Dual pitch synthesis block diagram

NORMAL

waveform data

CHORUS

waveform data

Shift

Envelope

Mixer output

Pitch A

Pitch B

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