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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a pedal sound forming apparatus
according to an embodiment of the present invention. FIG. 2 shows the above embodiment. FIG. 3
is a curve showing the timbre filter characteristics, and FIG. 4 is a connection diagram showing a
specific circuit example of the above embodiment. 11.12, 13 ... first to third sound source
14.15.16 first to third switching circuit 18, phase inversion circuit 19, 20....
DETAILED DESCRIPTION OF THE INVENTION This invention relates to a pedal sound forming
apparatus for an electronic musical instrument, which has been modified to obtain, for example,
a single color such as a pitcher, and to make a particularly rhythmic performance such as a wide
i performance hall to be performed effectively. . A pedal keyboard in an electronic musical
instrument is mainly used to obtain a rhythmic sound due to a low-pitched sound component,
and a sound source signal as a reference is used to combine one overtone component
appropriately and p-close it by key operation. It is used as a play sound. In this way, when
playing such a pedal sound in a relatively narrow room, the high-pitched component consisting
of the reference bass component and the overtones is well mixed, and an effective pace rhythm
sound can be obtained. However, for example, when playing the electronic Qi 6 in a wide i
performance hall (hall), it becomes difficult to obtain a good pedal sound. That is, in a large
performance venue (r, the bass component of the pedal Takenaka sounds well, but the high-old
component is difficult to hear, and the pedal keyboard sound becomes very muffled). This is
because the remnants of the hall and the like have a bass-like 4 characteristic, and the pedal
sound of the conventionally used electronic musical instrument has a rich harmony, even if the
sound of the entire musical instrument is beaten from that purpose. It is important that the age
of the person is important, and that there is a sense of bass, as it is. In the recent performances of
poppylar music, the electric pace tends to be used frequently as a musical instrument carrying
the bass. In this case, the musically receiving role of the pace is to obtain a mere low-pitched
feeling, and it is not only necessary to have a good feeling of high X in the low-pitched part, and
also to improve the sound path 1 It is because they are trying to get the rhythm line of Noyanchi.
However, 4. of the conventional M baby chestnut bowl. j: With a pedal that has just made a piece
of music, it is possible to generate and power its performance well in this way. With the idea of
H'6 like above ',,-, eg, playing on the large pole of f, even f illusion can represent the pedal i well,
and can also be I of no motherhood! In order to provide a pedal-barrel-forming cover of an
electronic musical instrument capable of performing a Vh-like rhythmic performance, a 混合 7 $
j @ f of a 混合 1 for taking out a reference mixed signal including an overtone component of a
number , The second sound source L to extract only the harmonic component in the reference
mixed signal by phase inversion. ! The circuit from the first and second tone source circuits has
an L path and gold, and takes out and combines the signals from the first and second tone source
circuits through different tone-coloring filters. An embodiment of the present invention will be
described below with reference to the drawings.
FIG. 1 shows the constituent countries (A source signal of 16 'which is the basis of the dull sound
and a source signal of 8' and 4 'which is the harmonic 16 of this are extracted respectively from
4X1 to 3 It has a sound source 11.12.1J. The sound source signals from the first to third sound
sources 11 to 13 are the switching circuits 14. zs and x6 vc are supplied together, and the
opening / closing l of the switching layer 14 to 16 is output as an output signal according to
the control. In this case, the switching circuits 14 to 16 are simultaneously driven by the 4 / key
17 of the electronic f unit (not shown), and the sound source signals 16 ', 8' and 4 'are
responsive to the operation of the idal key 11. For example, the circuit is set to be taken out with
an envelope as shown in FIG. In FIG. 2, "ON" is the time when the sweeping of the hair 17 is
started t, and rOFFJ is the time when the operation of the key 17 is released. And the signal rises
completely between ON and t + = 10 to 20 ms 5.1 ps, and the signal decays with a sustain
time of L 0.2 to t, = 1.5 s from Lroy v 3 It is The outputs of the switching circuits 14 to 16 are
collectively processed through resistors R1rR1 * R, respectively, to form a tenth tone signal
circuit for obtaining a reference mixed signal, and for the second and 竿 3 steps for obtaining a
harmonic signal. The output side of the open / close circuit 151g is collectively connected via a
resistor R4 + Rg to be supplied to the phase inverting circuit 18 to make each of the sound
source circuits of the clear 2. That is, from the first sound source circuit, a zeta-mixed signal with
a multiplication factor phase is obtained, and a signal obtained by reversing the β-number to 1
in the second harmonic with the harmonic included in the second sound source circuit. I got it.
And this 1st from the second sound source circuit via the first and -12 tone color filters 19.20 of
different pass frequency bands, respectively, at a rate determined by the resistance R @ + Rw
Synthesized as Yamato Summon f Shinya, and increase III! ! From the unit 21 as an output signal.
In this case, the frequency characteristic j-y of the filter 19.20. 3EO, it is considered to be the
characteristics of curves A and 3 having peaks at # 300 Hz and about 1000 Hz, and the wave
number distribution between the output tone signals may be that the signals of the twentieth
tone source circuit are in reverse phase. Relatedly, it becomes K like curve C, and this is made by
experiment etc. FIG. 4 shows a specific circuit example of the apparatus shown in FIG. 1. The first
to third sound sources 11 to 13 sequentially divide the input signal by the multivibrator circuit,
and J6 ', respectively. ,! ', 4' signals are taken out.
Each of the switching circuits 14 to 16 is composed of a switching circuit of a transistor, and is
connected to the key switch S which is turned on by the operation of the pedal rumor 12 and is
turned on by an open circuit. Then, by charging and discharging the capacitor C, an envelope as
shown in FIG. 2 is obtained K. The sustain time, that is, the time in FIG. 2 is variably controlled by
controlling the variable resistance VR. In addition, the signal 8 'and the signal i' 4 'are phasereversed in phase by the phase inversion circuit 18 consisting of transistors, and consist of a
capacitor, a resistor, an inductance, etc. together with the reference mixed signal of the reference
phase. It synthesizes via the filter 19.20 made into @ music as shown in. This pigeon, filter 19.20
is shown in FIG. 43 as a tiger '-determined, the resistance which determines the combining side
of the signal at the time of R + = 100 Ω, R = 68 Ω, R,-150 If you set Ω, R, = 82 Ω, R, = 270 Ω, R
@ "220 at Ω, and R ma = 22 Ω, respectively, the frequency characteristics shown in Fig. 3 curve
C and Thus, for example, a deafening sound of timbre like a tuba can be obtained. As described
above, according to the present invention, the overtone component contained in the mixing
signal is opposite in phase to the reference mixing signal, and the pedal sound signal has a
different cascade factor than that of the reference mixing signal. 7! By combining the signal
through the Ume color filter, 71 other special sounding signals exist in the VC treble part of the
bass part and so on, so even if it is in a wide performance venue etc. (! It is possible to play
electronic musical instruments with sharp sounding and noise), and to make it possible to
improve the performance of electronic musical instruments more effectively. It is a thing.
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