Nomenclature of keys
F3 A3 C4 E4
G4 B4 OB
F5 AS
C6
G3
B3
04
F4 A4 CS £5 Q5
B&
Envelope/Pitch Mixing Circuit
The Concertmate-500 has
four Envelope/Pitch mixing circuits. The circuits generate melody,
obbligato, chord and bass sounds by
means
of a
mixing envelope and pitch signals from the CPU.
At "NORMAL" mode, all of the
four circuits generate melody signal, while they create
melody,
obbligato, chord, and bass sounds individually at the other modes.
Note:
The waveforms are
only for understanding
the principle of the above
circuit.
The actual
waveforms differ from the
figure.
(§):(!>«
10:1
Figure 2
The pitch signal PS from the CPU is amplified by differential amplifiers (transistors T1 5 and T16).
Since the envelope signal ES from the CPU is a stepped waveform, the CR circuit smoothes it.
These signals are mixed in transistor T17. and the mixed
sound signal is provided to
the filter
circuit,
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