SOUND
subprogram
Frequency
The
frequencyyou
specify may be
either
a tone
or
a noise.
The
tones,
measured
in Hertz (one cycle
per
second.IHzl), can
be
specified from a low-pitch
of
110
Hz to a high pitch of 44733 Hz,
well
above
human
hearing
limits.
(The
actual
frequency
produced
may
vary
from zero
to
ten
percent
depending
on the
frequency.)
The
frequencies
for
some
common
musical notes
are
given in the Appendix.
If
a
negati
ve
value
for
frequency
is
specified,
a
noise,
rather
than
a
tone, is produced.
The
noise is either "white noise" or "periodic
noise."
The
noise
associated
with
each
value is given in the table
below.
Since
it
is
difficult
to
describe
the
difference
between
noises,
you
can
tryout
the different noises yourself to become familiar with
each
one.
Noise Characteristics
Examples:
>CALL
SOUND(1000,440,2)
--pLays
a
singLe
tone
>CALL
SOUND(500,-1,Zl
--pLays
a
singLe
noise
>NEW
>100
FOR
NOISE=-t
TO
-8
STEP
-1
>110
CALL
SOUND(1000,NOISE,2l
>120
NEXT
NOISE
>130
END
>RUN
--all
8
diiferent
noises
are
generated
Frequency
Value
-1
-2
-3
-4
-5
-·6
-7
-8
Characteristic
"Periodic
Noise"
Type
1
"Periodic Noise" Type 2
"Periodic Noise" Type 3
"Periodic
Noise"
that
vurics
with
the
frequency of the third tone specified
"White Noise" Type 1
"White Noise" Type 2
"White Noise" Type 3
"White Noise"
that
varies with the
frequency of the third tone specified
""
DONE
""
>CALL
SOUND(ZOOO,-3,Sl
--plays
a
single
nui~e
A
maximum
of
three
tones
and
one
noise
can
be
activated
simultaneously.
For
each
tone or noise specified. its volume must
be
indicated
immediately
following
the
tone
or
noise
User's
Reference
Guide
>CALL
SOUND(2S00,440,2,659,S,
880,10,-6,15)
--plays
3
tones
und
1
noi~c
>DUR~2500
>vOL=2
>r=262
>E=330
>G=392
>CALL
SOUND(DUR,C,VOL,E,VOL,G
, vOLl
--produces
a
C-major
chord
11-85
To Next Page
Loading...
Need help?
General
