JPS604237Y2 - Chord playing device for electronic musical instruments - Google Patents

Description

[Detailed description of the invention] This invention enables selective bass performance using a plurality of bass switches linked to black keys and chord performance using a plurality of chord switches that select various chords. This invention relates to an improvement in a chord playing device for an electronic musical instrument in which a selected chord can be changed to major, minor, seventh, etc. by using a white key of a black key and a base switch corresponding to a black key, respectively.

The black keys in the electronic musical instrument described above are arranged so that the white keys extend long toward the rear (towards the player's side), whereas the black keys are shorter than the white keys and are positioned in front.

With this arrangement, there is almost no chance that you will accidentally press the black key when pressing the white key, but
If you press a black key, there is a very high possibility that you will also press a white key.

The present invention was developed in view of the above circumstances, and its purpose is to create a priority circuit that, when a white key is pressed together with a black key, only the consciously pressed black key is validated. It is an object of the present invention to provide a chord playing device for an electronic musical instrument that can prevent erroneous playing due to erroneous operation as much as possible.

Hereinafter, the present invention will be explained in detail with reference to an embodiment shown in the drawings.

In FIG. 1, FF1 to FF12 are -octave,
Flip-flop circuits for storing musical tone signals are provided corresponding to a total of 12 black keys.
The emitter of each transistor 1 and 2 is connected to a grounded earth line 7 (low level), the collector of each transistor 1 is connected to a power supply line 8 via a resistor 5, and the collector of each transistor 2 is connected to a power supply line 8 via a resistor 5. is connected to another power supply line 9 via a resistor 6.

The power line 8 is connected to a power terminal 11a (10) through a resistor 10, and the power line 9 is connected to the power line 8 through a cancellation circuit 12.

This cancellation circuit 12 is a flip-flop circuit FF.
In response to a change in the potential of the power line 8 when two or more FFs 1 to FF12 are in the set state at the same time, the power line 9 is temporarily changed from a high level state to a low level state, and the set state is set. This is for resetting the flip-flop circuits other than those receiving the set input signal among a plurality of flip-flop circuits FFl to FF12.

G1 to G12 are gate circuits, which are turned on when receiving a high level signal from the collector of each transistor 2 via lines LA1 to LA12, and are connected to each musical tone signal input terminal M.
Bass tone musical tone signals, which are always sent to lines 1 to M12, are transmitted to line LB1.

The musical tone signal transmitted to line LB1 is transmitted to line LB2 via tone color circuit 13 and amplifier 14.

Switches SL to B5 are configured to be manually switched between the solid line position and the two-dot chain line position in conjunction with each other, and are used to switch between chord performance and bass performance.

In these changeover switches S1 to S5 and other switches described below, the movable contact piece will be referred to as the C contact piece, and the fixed contact pieces will be referred to as the a contact piece and the b contact piece, respectively.

Now, in the changeover switch S1, its C contact is (+■
), the B contact piece is connected to the line ratio, and the A contact piece is the contact piece (c-b) of the changeover switch S2.
The ground line 7 is connected to the ground line 7 through the ground line 7.

SB1 to 5B12 are base switches corresponding to each black key, among which base switches SBI, SB2 . SB3.
SB4. and SB5 are pace note names C2#, D2# -
Ft#* is linked to the black keys corresponding to G□# and A1#, respectively, and is also linked to the base switch SB5. SB7.5B1
3. SB9, 5B10.5BII and 5B12 are bass note names C2, D2°C2, F2. G1. It is designed to be linked to the white keys corresponding to A1 and B□, respectively.

The relationship between pace note names and base switch names is shown in FIG.

Regarding the selection of one of the flip-flop circuits FF1 to FF12, the bass switches SB1 to PB5 corresponding to the black keys are given priority over the base switches SB5 to 1B12 corresponding to the white keys, and the bass switches are given priority. A priority circuit is configured.

That is, in the base switches SBl to SB5, each contact piece is vertically connected to each C contact piece of the mating switch in the order from low tone to high tone, and
The contact piece is the a contact piece of the changeover switch S1, and the base switch S
The B contact piece of B5 is connected to the C contact piece of the changeover switch S3.

In the other base switches SB5 to 5B12, in the same manner as described above, each contact piece is vertically connected to each C contact piece of the mating switch in the order from bass to treble, and the C contact piece of base switch SB6 is On the a contact piece of the changeover switch S3,
The b contacts of the base switch 5B12 are respectively connected to (10V) power supply terminals 11c.

On the other hand, each of the a contacts of the base switches SB1 to 5B12 is connected to the base of each transistor 1 of the flip-flop circuits FF1 to FF12 via diodes D1 to D12, respectively.

SC1 to 5c12 are code switches that are linked to each key on the upper keyboard, and as shown in Fig. 2, the code names are C#, D#, F#, G#, A#, C, D, E in the above order. ,F,G
.

It corresponds to A and B.

Each of the code switches SC1 to 5c12 has one end connected to the line ratio in common, and each other end connected to a corresponding flip-flop circuit FF.
It is connected to the base of each transistor 1 of FF1 to FF12, respectively.

Here, the diodes D1 to D12 have a line ratio and a ground line 7, for example, when the diode D1 is taken as an example.
The code switch sc1. base switch SBl
between the contacts (a-c) and the contact piece (c-) of the changeover switch S2.
b) prevents short-circuiting through the contact piece (b) of the changeover switch S2, and
- c) and between the contacts (c and a) of the base switch SBl to prevent it from being applied to the base of the transistor 1.

Reference numeral 15 denotes a sound source circuit, and 16 a gate matrix circuit. The gate matrix circuit 16 receives a high level signal from any one of the flip-flop circuits FF1 to FF12 through one of the corresponding lines LA1 to LA12. When a set signal (chord selection signal) is received, a plurality of musical tone signals corresponding to the chord name of the chord selection signal are sent from the sound source circuit 15 to Vt Wt X, Yt Z
It is configured to output to lines LDl to LD5 via terminals.

Note that details of this relationship will be described later. Line LDl, LD2
．． The musical tone signal output to LD3 is transmitted through gate circuits GDl, GD2 . Line LB3 controlled by GD3
The musical tone signals output to lines LD4 and LD5 are transmitted as they are to line LB3, and the musical tone signals for chord tones mixed on line LB3 are transmitted to tone circuit 1.
7, gate 18 and amplifier 19 to be transmitted to line LB4.

The musical tone signals transmitted to the lines LB2 and LB4 are finally output to the speaker via an automatic rhythm gate circuit that is automatically turned on and off based on the rhythm pattern signal.

Now, 20 is a code change selection circuit, which is configured as follows.

That is, the b contact of the changeover switch S3 is connected to the line LE1, and this line LE1 supplies the gate signal directly to the gate circuit GD1 and to the gate circuit CD2 via the inverter 21. The line LEl is connected to a power terminal 11d via a resistor 22.

Further, the C contact of the changeover switch S4 is connected to the changeover switch S3.
The switch S4 is connected to its a contact piece, and its b contact piece is connected to a line LE2, and this line LE2 supplies a gate signal to the gate circuit GD3 via an inverter 23.

The gate 18 is turned on by receiving a high-level gate signal from the power supply terminal lie (10) through the contacts (c-b) of the changeover switch S5. The a contact piece of is set to low level by grounding.

Next, the operation of the above configuration will be explained.

First, regarding chord performance, in this case, each of the changeover switches S1 to S5 is manually switched to the solid line position.

In this state, in order to play a chord, for example, when the chord switch SC6 corresponding to chord name C is closed by pressing the corresponding handcuff, the flip-flop circuit FF6 turns on transistor 1 and turns off transistor 2. A set state is entered, and a high level signal is output to line LA6.

As a result, on the one hand, the gate circuit G6 is turned on, and as is clear from the correspondence between the 1st musical tone signal input terminal column and the 1st bass note name in FIG. 2, the musical tone signal input terminal The musical tone signal C2 inputted to M6 is sent to the gate circuit G6.
on the other hand, the high level signal on the line LA5 is output to the gate matrix circuit 1.
6 as a code selection signal.

Then, the musical tone signals shown in the columns 1, W, X, Y, and zJ that convect horizontally with the column 1 switch name SC6 shown in FIG. 2 become V and W of the gate matrix circuit 16.

Output to x, y, z terminals.

On the other hand, if neither the black key nor the white key of the buckle is pressed, all SB1 to 5B12 are turned on to the b contact side, so line LE1 becomes low level with the same potential as ground line 7. Therefore, the gate circuit GD1 is off and the gate circuit GD2 is on, and the line LE2 is at a high level due to the voltage (10) from the power supply terminal 11c connected to the b contact of the base switch 5B12. Since the output of the inverter 23 is at a low level, the gate circuit CD3 is in an off state.

Therefore, V and W of the gate matrix circuit 16.

V in the musical tone signal output to the X, Y, and Z terminals.

Only the musical tone signals output to the W and X terminals are sent to the line LD2.
It is transmitted to line LB3 via LD4 and LD5.

By the way, as is clear from FIG. 2, a chord composed of musical tone signals output only to the V, W, and X terminals is a major chord.

Therefore, the code switch SO6 is closed as described above,
Moreover, when neither the black key nor the white key is pressed, as can be understood from FIG. 2, the chord tone of the C major chord and the bass tone of C2 will be produced.

On the other hand, as described above, when the chord switch SC6 is closed, only one arbitrary black key is pressed, and the corresponding bass switch SBl is switched to turn on the a contact side, for example. In this case, the contact piece (c-b) of the base switch SB1 is turned off, so that
The line LEl is released from the potential by the ground line 7 and becomes high level.

Then, the gate circuit GD1 is turned on and the gate circuit GD2 is turned off.On the other hand, since the white key is not pressed, the gate circuit GD3 is turned off for the above-mentioned reason.

Therefore, V and W of the gate matrix circuit 16.

Only the musical tone signal output to the Y terminal is transmitted to line LB3.

The chord composed of the musical tone signals output to the V, W, and Y terminals is minor, as understood from Figure 2, and therefore, in this case, it is C minor since it is accompanied by the closing of the chord switch SC6. It becomes a code.

Next, close the code switch SC6, press only one arbitrary white key without pressing the black key, switch the corresponding base switch SB5, and switch the contact piece (c -b), line LE 2 is turned off.
When the voltage becomes zero, the output of the inverter 23 becomes high level, and the gate circuit GD3 is turned on.

On the other hand, the line LE1 is at a low level because all of the base switches SB1 to SB5 corresponding to the black key are on between the contacts (c and b), so the gate circuit GDl is off and the gate Circuit GD2 is on.

Therefore, the V of the gate matrix circuit 16. W, X, Z
The musical tone signal being output to the terminal is output to line LB3.

As understood from FIG. 2, this corresponds to the selection of the C seventh chord.

As described above, when the changeover switches S1 to S5 are manually set to the solid line positions, by closing any of the code switches SC1 to 5c12, these and the 1 code name column in FIG. Any one of the codes C9C#, . If no key is pressed, the chord becomes a major chord; if only the black key is pressed, the chord is changed to a minor chord; and if only the white key is pressed, the chord is changed to a seventh chord.

Next, the case where a bass performance is to be performed will be described. In this case, the changeover switches S1 to S5 are manually set so that the contact pieces (a-c) are turned on.

In this state, when a desired buckle, for example, a black key, is pressed and the corresponding base switch SB5 is switched on between contacts (C-a), the transistor 1 of the flip-flop circuit FF5 is turned on. On the base, there is a
Between contacts (c-b) of 1 to SB4, base switch SB
Since the flip-flop circuit FF5 receives a high-level signal from the power supply terminal 11b through the contact piece (c-a) of No. 5 and the diode D5, the flip-flop circuit FF5 is set, and thereby the gate circuit G5 is turned on and the bass tone C2 is output. A musical tone signal corresponding to is output to line LB1.

Similarly to the above, when a white key is pressed and the corresponding base switch 5B12 is turned on between contacts (ca), a high level signal from the power supply terminal 11b is applied to the base switches SB1 to SB1. Between the contact piece (c-b) of SB5,
Between the contacts (C-a) of the changeover switch S3, between the contacts (c-b) of the base switches SB6 to 5Bll, between the contacts (c-a) of the base switch 5B12, and between the contacts of the diode D1
2 to the base of transistor 1 of flip-flop circuit FF12, and this flip-flop circuit F
Set Fl 2.

Therefore, the gate circuit G12 is turned on, and a musical tone signal corresponding to the bass tone B1 is outputted to the line LB1.

In addition, in the bass performance as described above, the V and W of the gate matrix circuit 16.

A musical tone signal is output from any of the X, Y, and Z terminals, but the gate 18 indicates that this signal will be transmitted to line LB4.
is blocked by

At this point, when operating the buckle, as mentioned earlier, when you press the white key, it is extremely unlikely that you will also press the black key at the same time, but when you press the black key, the white key There is a very high possibility that you will also press the button.

If you also press a white key when pressing a black key like this, if you consider which key should be activated, you will find that this is a phenomenon that occurs when you intend to operate the black key in the first place. Therefore, pressing the black key should be enabled.

In this regard, according to the electronic musical instrument having the above configuration according to the present invention, the bass switches SBl to SB5 corresponding to the black keys are
A group of base switches for black keys, which are connected vertically, and a group of base switches for white keys, which are vertically connected base switches SB6 to 5B12 corresponding to white keys, are connected to the contact piece (
c-a) When forming one vertical connection circuit through Even if the keys are pressed at the same time, as a result of pressing the black key, the power supply to the white key base switch group is immediately cut off, and therefore, in the unlikely event that the flip-flop circuit FFl
Even if two of the FF 12 are set at the same time, the one corresponding to the white key is reset by the action of the canceling circuit 12, and the one corresponding to the black key is maintained in the set state. Only the press is enabled, and the apparent erroneous operation is resolved.

Therefore, according to the present invention, it is possible to provide a highly practical chord playing device for an electronic musical instrument that can minimize erroneous playing due to erroneous operation of the buckle.

[Brief explanation of the drawing]

Fig. 1 is a wiring diagram showing one embodiment of the present invention, and Fig. 2 is a wiring diagram showing an embodiment of the present invention.
It is a figure for explaining the effect|action of a figure. In the figure, FF1 to FF12 are flip-flop circuits, G
1 to G12 are gate circuits, SL to S5 are changeover switches, SB1 to IB12 are base switches, scl to 5
c12 is a code switch, GD1 to GD3 are gate circuits, and 20 is a code change selection circuit.

Claims (1)

[Scope of utility model registration request] A plurality of chord switches for selecting each chord of C, C#, ..., B, a plurality of bass switches operated by black keys, and chord performance by the chord switches and the bass a changeover switch for switching between a bass performance using a switch, and a bass switch corresponding to a white key of the black key and a bass switch corresponding to a black key to change the chord selected by the chord switch when playing a chord using the changeover switch; In an electronic musical instrument equipped with a chord change selection circuit for changing major, minor, seventh, etc., a black key priority circuit is provided between a bass switch corresponding to the white keys and a bass switch corresponding to the black keys. A chord playing device characterized by: