Yamaha TX 816 Owner's Manual page 69

Digital
Sequence
Recorder uses 5 1/4"
mini-disic that can
store a
whole
album's
worth
of
music
data.
^==^^='^''^==^^=
Frequency
modulation.
A
term
often applied to radio broadcasting, where
a
"carrier"
FM
wave
(with
a
frequency
higher than the
human
ear
can
hear)
has
its
frequency
modulated by
a "modulator"
wave
to
produce
audible
sound
in
listenable
fre-
quencies.
Yamaha's
FM
Tone
Generation System, incorporated
into
the
TF1 mo-
dules
and
DX
synthesizers, uses
a similar
system
to
produce sounds.
Up
to
now,
most
systhesizers created
sounds
either
by
filtering
frequencies out
of a square
or
sawtooth
wave
(analog
sythesizers) or
by combining
sine
waves
at
harmonic
frequencies
(additive synthesis).
In
both
cases,
it
is
difficult
to create acoustic type
sounds because
this
requires that the timbre
change
during the duration
of a single
note.
The
Yamaha
FM
Tone
Generator uses
six "operators"
--high
freguency
sine
waves
that
can
act as
carriers or
modulators-
-that
interact
with each
other to
produce
highly
complex, changing sounds,
that are simple
to create
and
control.
This unique system enables you
to create incredibly
realistic
acoustic type
voices.
For
a
full
explanation
of
FM,read
a
DX
synthesizer
Owner's
manual.
^''^^^='=^^^=='!^^=
Applied
to the
MIDI
system,
this
indicates the actual bytes that
make
up
the various
Format
commnds
such
as
"Key On". "Program
Number",etc.
These
are
listed
in
the
MIDI
FORMAT
section of
this
manual,
for
users
intersted
in
controlling the
TX816
with
their
own
ocmputers. During
the
initialization
process
of a floppy
disk,
the disk
is
divided up
into sectors
which
are consecutively
filled
with data as
it
is
entered.
This
arrangement
is
called the format,
and
varies
from one computer
to
Another.
_
A
parameter
that affects the
performance
of
an
FM
voice, rather
than
its
actual sound.
Function
For example.
Pitch
Bend,
Glissando, Breath Control
are
all
functions,
and can
be
programmed
and
stored
into
the TFI's memory. See
the
Edit
section of the IN-
TRODUCTION
for
more
details.
^
In
the
INDIVIDUAL mode
a
TF1
module
is
controlled
by
MIDI
signals sent
to
its
Individual
individual
MIDI
in terminal,
and
is
completely independent from
the other
TF1
modules.
SW1
must
be pressed
to set the
TF1
to
INDIVIDUAL, and
the
corre-
sponding
LED
will light up.
^=^^^^=''=^^=^
see Format.
Initialize
(floppy
disks)
_ _
_
Reduce
all
function data
in
the TF1
to their original,
standard
settings.
This
can
Initialize
(functions)
be done
in
one
operation as described
in
the Clear and
Initialize All
Functions
section
of the
UTYLITY
chapter.
_
A
unit
of
measurement
of the
rate at
which computer
data
is
equivalent
to
1000
Kilobaud
bits
per
second.
The
standard
MIDI
rate
is
31 .25 kilbauds.
='=^=^=^==^
An
abbreviation
for
Liquid
Crystal Display.
The
DX
systhesizers,
RX Rhythm
pro-
l~CD
grammers, and QX1
Digital
Sequence
Recorder
all
have
LCD's,
to indicate
modes,
functions, data,
etc.
LCD's
operate
by
using chemicals
that
change
their light
polarization characteristics
when
a voltage
is
applied
to
them.
In
combination with
a constant
polarized
layer,
the voltage-
altered crystal cancels out the
light
com-
pletely,
forming
the black dots whitch
create the alphabetical and numerical symbols
in
the
display.
You
can
test this effect
by
looking
at
an
LCD
with
polarized
sunglasses- -at
a certain
angle the display
will
be completely
black.
68