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Description  |
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BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an electronic musical instrument, for example
wind instrument type, which is provided with playing keys and musical tone
signal generating means and is capable of assigning any musical tone
parameter to a continuous operator such as wheel switch, wheel assigning
any musical play expression to a control means such as a foot switch or
transposing the scale of a musical tone signal by an interval of a fifth
at a time.
2. Description of the Prior Art
At present some electronic musical instruments have a controller which
shapes the wind type instrument such as clarinet. The musical instruments
are designed to control the musical tones by fingering and breath
intensity control which are similar to those of the wind type instrument.
Since the electronic musical instrument is designed so that the musical
tone parameter is generated based on the information detected according to
breath intensity and fingering and the musical tone is generated by
controlling the musical tone source unit according to this musical tone
parameter, it is possible to provide a free playing element (operator)
which is not provided in the natural wind instrument. One example is a
wheel switch which has been used until now. The wheel switch is an
operator capable of outputting analog control data according to rotation
angle. The existing electronic musical instruments have applied this wheel
switch for pitch bend function (a control function which controls an
effect to raise or lower continuously the pitch from a specified pitch).
In addition to pitch bend, there are other many musical tone parameters
which could afford rich expression of musical tone by generating them
based on analog data with the aid of a wheel switch. For example, it is
desirable to control continuously a the tone generation effect such as
vibrato from 0 level up to a maximum level.
However, as the function of the wheel switch of existing musical
instruments is restricted to the pitch bend function, depth of vibrato
cannot be changed. If the function of the wheel switch is fixed to adjust
the vibrato function (a control function which controls a vibrato), pitch
bend cannot be applied sufficiently. Accordingly, the existing electronic
music instruments have a disadvantage that they cannot sufficiently
express musical tones.
Some electronic musical instruments are provided with an operation means
which can be operated during playing in addition to the playing keys and
breath sensor so as to improve their musical expression ability. One
example is a foot switch. Musical expression effects (for example,
portamento and tone color change) which cannot be expressed by using only
the play keys or breath sensor can be given to musical tones.
Nevertheless, since the existing musical instrument features that one
function is inflexibly assigned to one operation means, many control means
are required to give many musical expressions, which results in
complicated play.
Usually, the electronic musical instrument has a disadvantage that since it
is provided with one or two operation means mentioned above, the range of
musical expression is narrow.
Usually the electronic musical instrument is tuned to C major. However, so
as to ensure easy ensemble with other musical instruments and play for
transposing instrument many electronic musical instruments are designed to
be able to transpose. Transposition is a function to generate tones of
another key (another pitch) with the same fingering. For example, if the
musical instrument which is tuned usually to C major is transposed upward
by 4 degrees, it can play F major by ordinary fingering.
The majority of wind instruments are transposing instruments. Therefore,
when C major music is played with this type of musical instrument,
actually played music may be B flat major or E flat major. Therefore so as
to play this music easily with the electronic musical instrument, it is
necessary to transpose its scale to the scale of a specific musical
instrument. In many cases the scale of wind instruments is adjusted by
increasing or decreasing the key signature .music-flat.(.music-sharp.)
such as F major-B flat major-E flat major. For example, some saxophones
are tuned to B flat major, but others to E flat major, some clarinets are
tuned to B flat major, but others to E flat major, and some horns are
tuned to F major, but others to B flat major. Thus in most cases
instrument transposition is executed with a 5 degree step.
However, the conventional electronic musical instrument is designed so that
transposition is executed with a semitone step. Therefore, transposition
from C major to F major needs the procedure of
C--C.music-sharp.--D--D.music-sharp.--E--F, which makes it impossible to
transpose quickly during playing.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an electronic
musical instrument including a wind type controller in which the
above-mentioned problems are solved by providing a possibility of
selecting the function of an operator such as a wheel switch.
Another object of the invention is to provide an electronic musical
instrument including a wind type controller in which the above-mentioned
problems are solved by assigning single music playing expressions which
are selected by a function switch to a single operator during playing.
A further object of this invention is to provide an electronic musical
instrument in which the above-mentioned problems are solved by providing a
possibility of transposing up and down with a 5-degree step by
transposition operation.
This electronic musical instrument of this invention has a capability of
selection of assigned functions to an operator such as the wheel switch or
foot switch.
For example, the electronic musical instrument of this invention is
designed so that the musical tone parameter generated according to the
operation of operators such as the wheel switch can be selected with the
aid of a function switch. A function switch can be operated by a player.
Consequently, the player can control various musical tone parameters,
using the wheel switch or the like, which allows the range of play to be
widened. If the above-mentioned function switch can be operated during
play, it is possible to change the musical tone parameter controlled by
the wheel switch or the like.
The electronic musical instrument of this invention is designed so that one
of musical play expression functions can be assigned to one operator.
Moreover this assignment can be performed by operating the function switch
during playing. For example, if the operator comprises a foot switch and
the function switch comprises several Keys, (hand switches,) the function
of the foot switch can be assigned with a proper timing to the key hold
function (a control function to generate continuously the once specified
pitch) or the program change function (a control function to change the
tone color and effect), and the pertinent function can be used by turning
on the foot switch with a timing at a moment just when it is required.
Thereby musical play expression can be given effectively with a proper
timing by simple operation, which enhances greatly the expression ability
of the electronic musical instrument.
The electronic musical instrument of this invention features that the
instrument has a first mode in which the scale of the instrument can be
transposed up with a step of 5 degrees and a second mode in which the
scale of instrument can be transposed down with a step of 5 degrees, and
each of the two modes can be assigned to the operator. In the case when
the reference scale is C (C major), transposition is executed in the
procedure of C.fwdarw.G.fwdarw.D.fwdarw.A.fwdarw.E.fwdarw.B.fwdarw. in the
first mode, and the transposition is executed in the procedure of
C.fwdarw.F.fwdarw.Bb.fwdarw.Eb.fwdarw.Ab.fwdarw.Db.fwdarw. in the second
mode. In the case when the reference scale is B, transposition is executed
in the procedure of B.fwdarw.E.fwdarw.A.fwdarw.D.fwdarw.G.fwdarw.C in the
second mode. Furthermore it is designed so that when the scale deviates
from the reference scale by more than a half-octave as a result of
transposition an octave shift is performed to set the deviation within a
half-octave. For example, if the result of transposition from C3 is G3,
deviation between the transposed scale and the reference scale is 5
degrees. If octave scale is lowered down to G2, the deviation from C3 is 4
degrees, namely within a half-octave. Similarly, when the scale is lowered
excessively due to transposition, the deviation from the reference scale
can be set within a half-octave. As a result of this transposition, a
scale corresponding to a to the scale of real natural instrument is
possible, instrument operation becomes easier, and the player can
transpose quickly during playing. Moreover, excess scale deviation does
not occur in the case of transposition, which eases play. Furthermore,
semitone transposition is also possible. Therefore any transposition can
be executed at once.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1 (A) and (B) show an appearance of a controller of an electronic
wind instrument which is an embodiment of the invention. FIG. 2 is a block
diagram of the control section of the electronic wind instrument. FIG. 3
shows partial configuration of RAM of the control section. FIGS. 4 (A) and
(B) are flow charts showing the operations of the control section. FIG. 5
is a block diagram of the control section of an electronic wind instrument
which is another embodiment of this invention. FIG. 6 shows the partial
configuration of RAM of the control section. FIGS. 7(A)-1, 7(A)-2, (C) are
flow charts showing the operations of the control section. FIG. 8 is a
block diagram of the control section of an electronic wind instrument
which is the third embodiment of this invention. FIG. 9 shows a partial
configuration of RAM of the control section. FIGS. 10 (A) to (D) are flow
charts showing the operations of the control section.
DESCRIPTION OF THE PREFERRED EMBODIMENT
FIGS. 1 (A) and (B) show an appearance of a controller 2 of an electronic
wind instrument which is an embodiment of this invention. FIG. 1 (A) is a
front view, whereas FIG. 1 (B) is a rear view. This electronic wind
instrument includes the controller 2 which has a shape similar to that of
a woodwind instrument as shown in FIG. 1(A) and FIG. 1(B). The instrument
is played by a style of playing in which the body is held by both hands
and the player's mouth is touched to a part of the body (the top of the
body in this embodiment). The instrument has also a tone source unit 1
which generates the musical tones (see FIG. 2). They are a connected to
each other with connector cable.
In FIGS. 1 (A) and (B) the controller 2 has a shape similar to that of a
woodwind instrument such as soprano saxophone. A mouthpiece 3 is provided
at its front end. The player holds the mouthpiece in his mouth and blows
breath into it to play the instrument. A breath sensor 21 (see FIG. 2) is
provided in the mouthpiece 3. The breath sensor 21 detects the intensity
(breath intensity) of the blowing in of breath. At the external side the
instrument is provided with pitch keys 7 (7-1 to 7-13) designated to set
the interval of the musical tone to be generated in an octave and octave
keys 8 (8-0 to 8-2) designated to set the octave of the musical tone to be
generated. These pitch keys 7 and octave keys 8 compose the play keys. The
play keys enable the player to set the pitch by fingering (key pattern)
similar to that of a saxophone. At the rear side of controller 2 a wheel
switch 10 is provided. The wheel switch 10 is an operator which can be
turned at a specific angle in the arrow direction in the figure. It is
operated by the thumb of the right hand. The turn angle of this wheel
switch 10 is detected by a permanent magnet and a hall element. Namely,
the permanent magnet is provided in the wheel switch 10, and the hall
element is provided in the main body of controller, opposite to the
permanent magnet. When the wheel switch 10 is turned, the distance between
the permanent magnet and the hall element changes, resulting in a change
of resistance of the hall element, and consequently resistance of the hall
element changes, so that the turn angle of wheel switch 10 is electrically
detected. A connector opening 11 is provided at the lower part of rear
side of controller 2.
FIG. 2 is a block diagram of control section of this electronic wind
instrument. This electronic wind instrument comprises the controller 2
shown in FIG. 1 and the tone source unit 1 which is connected to the
controller 2 with the connector cable. Musical tone signals generated by
the tone source unit 1 are inputted into a speaker system 40 and then
outputted as sound (musical tone).
The tone source unit 1 is controlled by CPU 20. CPU 20 is connected to
pertinent operating section through bus 24. An interface 23, a fingering
data ROM 29, a tone color data ROM 33, a program ROM 31, a data ROM 32, a
RAM 33, a tone generator 34 and a display 27 are connected to the bus 24.
The controller 2 is connected to the interface 23 through an A/D
converting circuit 22. A foot switch 11 and a function switch 5 are also
connected to the interface 23. From the controller 2 the outputs of breath
sensor 21, wheel switch 10 and play keys 7 and 8 are inputted as operation
data signals. The function switch 5 incorporates a wheel mode selection
switch 5a, a+1 switch 5b, a-1 switch 5c and tone color setting switch. The
musical tone signal of audible frequency which is generated by the tone
generator 34 is outputted to the speaker system 40 through an effect
circuit 35 designated to add various sound effects, a D/A converting
circuit 36 and an amplifier 37. The wheel mode selection switch 5a is a
switch designated to change the control function of wheel switch 10 to
pitch bend or vibrato.
The fingering data ROM 29 stores a table which specifies the assignment of
the pitch of musical tone to be generated to the key pattern of play keys
7 and 8. The tone color data ROM 32 stores the waveform data of tone
colors which can be generated by the tone source unit 1. The program ROM
31 stores a program to control operations of the tone source unit 1. The
data ROM 32 stores various musical tone control data. In the RAM 33 a
wheel mode flag F and a pitch bend mode register R are set. The wheel mode
flag F is used to recognize whether the wheel switch 10 has the pitch bend
function (pitch bend mode) or vibrato function (vibrato mode). If this
flag is set, it indicates that the current mode is vibrato mode. The pitch
bend mode register R is a register designated to set the extent of pitch
change (up or down) when the wheel switch 10 is operated to the full. This
register stored 0 to 5 numerics. Maximum pitch bend corresponding to each
numeric is as follows.
5: Octave up
4: 5-degree up
3: Whole tone up
2: Semitone up
1: Whole tone down
0: Octave down
FIGS. 4 (A) and (B) are flow charts showing the operation of the
above-mentioned CPU 20. FIG. 4 (A) shows a main routine. FIG. 4 (B) shows
a sub-routine which is executed when an ON event of wheel mode selection
switch 5a, +1 switch 5b and -1 switch 5c in the main routine is detected.
At first, an explanation of the main routine shown in FIG. 4 (A) is given
below. When the power switch of the electronic wind instrument is turned
on, its operation is started. At first, at step n1 the initialization of
register and flag resetting are performed. As a result of initialization
the electronic wind instrument is made playable. Then at step n2 the ON
event of function switch is detected. If one of the function switches,
namely when mode selection switch 5a, +1 switch 5a or -1 switch 5c, is
turned on, the operation shown in FIG. 4 (B) is executed. After this
operation ON/OFF state of the pertinent operator provided on the
controller 2 is detected (steps n3 to n5). At step n3 the key pattern of
the play key is detected. The detected key pattern is compared with the
data of the fingering data ROM 29, so that the specified pitch is found.
At step n4 the breath data is detected. Based on this data the tone volume
level of the musical tone to be generated is determined. Next, the wheel
switch data (operation data of wheel switch 10) is detected (n5). After
the wheel switch data is detected, the wheel mode flag F is referenced,
and vibrato mode/pitch bend mode is judged (n6). In vibrato mode the
process proceeds to step n7 where vibrato value is determined according to
the wheel switch data, and then the process proceeds to step n10. In pitch
bend mode the process proceeds to step n8 where at first the maximum pitch
bend value is read from the pitch bend mode register R. Then at step n9
the ratio of current wheel switch data to the wheel switch maximum
operation value is normalized with the read maximum pitch bend value, and
after the pitch bend value in this state is calculated, the process
proceeds to step n10. At step n10 the waveform data of the musical tone to
be generated is decided, and is outputted to the tone generator 34. At
step n11 the interval of the musical tone to be generated is determined
based on the above-mentioned data, and obtained data is outputted to the
tone generator 34. Then, key on/off data based on the output of the breath
sensor and tone volume is outputted to the tone generator 34 where musical
tone is generated.
While the musical instrument is operated, operations of steps n2 to n12 are
repeatedly performed. However, if the detected value of the breath sensor
21 is less than a specific value, key-off data is sent to the tone
generator 34, so that a musical tone is not generated irrespective of what
type of operation is performed.
FIG. 4 (B) shows a sub-routine corresponding to an ON event of some
function switches. This operation is executed corresponding to an ON event
of wheel mode selection switch 5a, +1 switch 5b and -1 switch 5c. At
first, at steps n21 to n23 a judgment as to ON event of what switch occurs
is performed. If the wheel mode selection switch 5a is set to ON, the
process proceeds from step n21 to step n24, the wheel mode flag F is
inverted (n24), and the process returns. Namely, the wheel mode selection
switch is a toggle switch which can alternately set the vibrato mode and
pitch bend mode by repeating turning-on of this selection switch. In the
case when the +1 switch 5b is turned on, the process proceeds from step
n22 to step n25 where a judgment as to whether the pitch bend register R
is 5 or not is performed. If the register R is 5, there are no numeric
values larger than 5. Accordingly, the process returns regardless of the
ON event of the switch. If the register R is smaller than 5, 1 is added to
the content of register R (n26), and the process returns. If the -1 switch
is turned on, the process proceeds from step n23 to step n27 where a
judgment as to whether the content of the register is less than 0 or not
is performed. If it is less than 0, the process returns. If it is larger
than 0, 1 is subtracted from the content of register R (n28), and the
process returns. As a result of these operations the setting of maximum
pitch bend value can be changed with the aid of +1 switch and -1 switch.
In this embodiment of the invention the pitch bend mode/vibrato mode is
assigned to the wheel switch. It is possible to assign other functions to
it. It is also possible to select the functions of any operators other
than a wheel switch.
Accordingly, the electronic wind instrument of such a composition allows
application of operators such as the wheel switch as various musical tone
parameter controllers, so that it is possible to make various settings
according to the music to be played, thereby making it possible to express
a wide range of musical tones. If this setting change (by function switch)
can be executed during playing of the musical instrument, it becomes
possible to control various musical tone parameters during playing of one
music, which greatly enhances the expression capacity of electronic wind
instrument.
FIG. 5 is a block diagram showing the control section of electronic wind
instrument which is another embodiment of this invention.
The difference in configuration from that of control section shown in FIG.
2 is that there are two foot switches 11, namely foot switch 11a and 11b,
and another difference lies in the configuration of function switch 5 and
partial configuration of RAM 33. In this embodiment of the invention, the
foot switches 11 (11a, 11b) are operators to which any one of musical
playing expression functions is assigned. The function switch 5 executes
the assignment.
The function switch 5 includes an octave shift mode switch 5a', a program
change switch 5b' and a key hold mode switch 5c'. When these switches are
turned on, the pertinent function is set to the foot switches 11a and 11b.
The functions which are set to the foot switches 11a and 11b by the
function switches 5a', 5b' and 5c' are as follows.
(1) In the case of turning on the octave shift mode switch 5a':
When the foot switch 11a is turned on, the musical tone being played is
raised by one octave. When the foot switch 11b is turned on, the musical
tone being played is lowered by one octave.
(2) In the case of turning on the program change mode switch 5b':
When the foot switch 11a or 11b is turned on, the program moves forward or
backward, respectively, according to the set program order in the memory.
One program is composed of a combination of musical tones and effects such
as vibrato.
(3) In the case of turning on the key hold mode switch 5c':
When the foot switch 11a or 11b is turned on, the musical tone having a
pitch specified by the play key is sustained according to the breath
intensity while the foot switches are kept turned on.
Hold data register HR, mode register MR, and hold flag HFLG are set in RAM
33 as shown in FIG. 6. The mode register MR is a register to store the
function (mode) assigned to the foot switches. While "0" is stored in this
register, the current mode is octave shift mode. While "1" is stored, the
current mode is program change mode. While "2" is stored, the current mode
is key hold mode. The hold data register HR stores the pitch data which
must be held (tone generation which must be maintained even when the key
pattern is changed) in key hold mode. The hold flag HFLG is a flag to
store the ON/OFF state of the foot switch in key hold mode.
FIGS. 7(A)-1, 7(A)-2, 7(B) and 7(C) are flow charts showing the operation
of CPU 20. FIGS. 7(A)-1, 7(A)-2, and (B) show a main routine, whereas FIG.
7(C) is a flow chart showing the operation when the function switches 5a',
5b' or 5c' are turned on.
At first, an explanation of the main routine shown in FIGS. 7(A)-1, 7(A)-2,
and (B) is given below. When the power switch of this electronic wind
instrument is turned on, this operation is started. At step n31
initialization of register and flag reset are performed. Initialization
makes it possible to play the electronic wind instrument. Then at step n32
the ON event of function switch is detected. When one of the function
switches, namely octave shift mode switch 5a', program change switch 5b'
and key hold mode switch 5c', is turned on, the operation shown in FIG.
7(C) is executed. Following this operation, ON/OFF state of each operator
provided on the controller 2 is detected (n33 to n37). At step n33 the key
pattern of play key is detected. If the detected key pattern differs from
the preceding key pattern, it is judged that the pitch has been changed
(namely event ON), and the process proceeds from step n34 to n35 where the
pitch deduced from this key pattern is assigned to the specified channel
namely channel 0. At step n36 the breath data is detected. Tone volume
level of the musical tone to be generated is decided based on this data.
Next, wheel switch data (control data of wheel switch 10) is detected
(n35). Wheel switch data is used for control of pitch bend and vibrato.
After that, a judgment as to whether the foot switch 11a or 11b was
operated or not is executed. If any foot switch operation was done, the
operation of step n46 and after steps are executed, and then the process
proceeds to step n39. If the foot switch 11a or 11b was not operated, the
process proceeds directly to step n39 from step n38.
At step n39 the tone color waveform data of the musical tone to be
generated is decided (n39), the interval of musical tone to be generated
is decided based on the above-mentioned data (n40), and key ON/OFF data
and tone volume data are decided based on output of breath sensor 21
(n41). At step n42 the hold flag HFLG is judged (n42). If it has been set,
the data of hold data register HR is sent to the channel 1 (a channel
which is assigned to generate hold tone) (n43). The musical tone data
decided by the operations of steps n39 to n41 is sent to a tone generator
34 to generate a tone (n44). Mode of foot switch is displayed on the
indicator 27 (n45), then the process returns to step n32 to repeat the
same operations.
If at step n38 operation of foot switch has been detected, data of mode
register is judged at step n46. If it is "0", the current mode is octave
shift mode. Consequently, the musical tone is raised or lowered an octave
according to turn on foot switch 11a or 11b (n47). If the mode register is
"1", the current mode is program change mode. Therefore the previously set
program is read and set in the tone generator (n48). If the mode register
is "2", the current mode is key hold mode. Therefore ON/OFF of hold switch
is detected at step n49. If it is an ON event, the hold flag HFLG is set
(n50), and pertinent play data is stored in the hold data register HR
(n51). If it is an OFF event, the hold flag HFLG is reset (n52), and key
OFF signal is sent to the channel 1 which is generating hold tone (n53).
After completion of pertinent operation the process proceeds to step n39.
FIG. 7 (C) shows a subroutine which is executed in case of the function
switch ON event. If one of function switches, namely mode selection
switches (octave shift mode switch 5a', program change switch 5b' and key
hold mode switch 5c'), is turned on, this operation is executed. Value 0,
1, or 2 corresponding to turned on key is set in the mode register (n60),
and then the process returns. In this embodiment of the invention two tone
generation circuits (channels 0 and 1) are provided, the musical tone
corresponding to the key pattern is generated in the channel 0 whereas key
hold tone is generated in the channel 1. It is also possible to provide
more tone generation channels than this embodiment in the tone generator
and to allow any tone generation channel to be set or to make many
channels generate tones at the same time.
The electronic wind instrument having the above-mentioned configuration
ensures diversified musical expressions by selecting proper musical play
expression functions according to the music to be played since the player
can assign the most proper one among many musical play expression
functions to one of operators (foot switch, etc.). Moreover, since
functions can be selected during playing, the atmosphere of the same music
can be changed while it is played, thereby variegating the musical
expression.
FIG. 8 is a block diagram of the control section of electronic wind
instrument which is also another embodiment of this invention.
The major difference between the control section shown in FIG. 2 and the
control section shown in FIG. 8 lies in the composition of function switch
5 and the composition of a part of RAM 33.
The function switch 5 includes a transpose mode selection switch 5a", a +1
switch 5b", a -1 switch 5c", and a tone color setting switch. The
transpose mode selection switch 5a" is a switch to select by-5-degree
transposition or by-semitone transposition with the aid of +1 switch 5b"
or -1 switch 5c".
A transpose mode flag F' and a transpose register R' are set in the RAM 33
as shown in FIG. 9. The transpose mode flag F' is set or reset when the
transpose mode selection switch 5a" is set to ON. While this flag is set,
by-5-degree transposition mode (fifth mode) is set. While it is reset,
by-semitone transposition mode (semitone mode) is set. The transpose
register R' is a register to store the transpose value. Final pitch is
decided by adding or subtracting this transpose value to or from the pitch
which is set according to the key pattern (fingering).
FIGS. 10 (A) to (D) are flow charts showing the operation of CPU 20. FIG.
10 (A) shows a main routine. FIGS. 10 (B) to (D) show a subroutine which
is executed when the mode selection switch 5a", +1 switch 5b" or -1 switch
5c" is set to ON, respectively.
At first, the main routine shown in FIG. 10 (A) is explained below. When
the power switch of the electronic wind instrument is turned on, the main
routine is started. At step n71 initialization of register and flag reset
are executed. At this time 0 is set in the transpose register R'. As a
result of this initialization the electronic wind instrument becomes
operable. Next, at step n72 the ON event of the function switch is
detected. When one of function switches, namely transpose mode selection
switch 5a", +1 switch 5b" or -1 switch 5c", is set to ON, the operation
shown in FIGS. 10 (B) to (D) is executed. After this operation, ON/OFF
state of pertinent operator provided in the controller 2 and the operation
state are detected (n73 to n75). At step n73 the key pattern of the play
key is detected. The key pattern detected by this operation is compared
with the data of fingering data ROM 29, so that the specified pitch is
found. At step n74 the breath data is detected. Volume level of the
musical tone to be generated is determined based on this data. Next, wheel
switch data (wheel switch 10 control data) is detected (n75). The wheel
switch data is used for control of pitch bend and vibrato. After that, the
tone color waveform data of the musical tone to be generated is decided
and outputted to a tone generator 34 (n76), and the interval of the
musical tone to be generated is decided based on the above-mentioned data
and outputted to a tone generator 11 (n77). After key ON/OFF data based on
output of breath sensor 21 and tone volume is outputted to the tone
generator 34, the process returns to step n72.
During operation of this musical instrument the operation of steps n72 to
n78 is repeatedly executed. If the detected value of breath sensor 21 is
lower than a specific value, key OFF data is sent to the tone generator
34. Therefore a musical tone is not generated irrespective of what
operation is performed.
FIG. 10 (B) shows the operation when the transpose mode selection switch
5a" is set to ON. When the transpose mode selection switch 5a" is set to
ON, the transpose mode flag F' is inverted (n80), and the process returns.
Accordingly, the transpose mode selection switch 5a" is a toggle switch
which can set alternately fifth mode and semitone mode by repeatedly
setting it to ON.
FIG. 10 (C) shows an operation when the +1 switch 5b" is set to ON. If the
+1 switch 5b" is set to ON, at first the transpose mode flag F' is
referenced to judge whether the current mode is fifth mode or semitone
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