JPS6030764Y2 - Transposition control device for group performance training device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a novel transposition control device for arbitrarily controlling the transposition of electronic musical instruments of each child unit from the parent unit side in a group performance training apparatus.

A group performance training device that has been proposed in the past is provided with at least one base unit and a plurality of slave units connected to the base unit in order to communicate with the base unit regarding performance lessons. Each of the child electronic musical instruments was provided with a transposition circuit that transposed the musical tone to be played in response to a transposition control signal from a transposition control switch.

This type of group performance training device has the advantage that the parent unit and each child unit can transpose independently, but on the other hand, it is difficult for the parent unit to instruct one or more specific child units to transpose to a specific key. The only option was to give verbal instructions, and it took a considerable amount of time for the handset to transpose.

In particular, when transposing a large number of handsets in a uniform manner, it is difficult to achieve uniformity, resulting in a decrease in teaching efficiency.

The purpose of this invention is to provide a novel transposition control device that allows the base unit to forcibly select the key in which each slave electronic musical instrument should play.

The main feature of this invention is that each slave unit is equipped with a priority circuit that preferentially outputs the transposition control signal from the master unit when the master unit and each slave unit are instructed to transpose to a different key. The key point is that the transposition circuit of each child unit is controlled according to the output of this priority circuit.

According to this feature, since the base unit can forcibly select the key in which each slave unit should play, transposition can be done more accurately and quickly than if the slave unit were to do the transposing operation, especially when playing in multiple This has the effect of greatly improving teaching efficiency when transposing keys uniformly for arithmetic handsets.

This invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

FIG. 1 shows a transposition control device according to an embodiment of this invention. n
Transposition control switches s1.2tn3... are respectively operated. s2. s3... is provided.

Each of these control switches has a switching contact a that is not connected anywhere, and a total of 1 of the keys of C to C# to be transposed.
Switching contacts b1, b2...b1 corresponding to the key of 2
2.

Each transposition control switch S1. S2. The transposition control signals taken out from the switching contacts b1 to b12 of S3... are sent to the encoders EN and EN2, which are provided corresponding to each slave unit.
Supplied to EN3...

A transposition control signal from any of the transposition control switches described above may be supplied to a transposition circuit of a parent electronic musical instrument (not shown) in order to control transposition thereof.

Each encoder EN,, EN2. EN...
... generates a transposition control signal in the form of converting the switching position output of the corresponding transposition control switch into a digital code signal.

On the handset side, there are many handsets 10A, IOB, 10C...
... are arranged, and the electronic musical instrument of each slave unit is connected to the slave unit 10.
A has a sound source circuit configuration as exemplified as a representative example.

In the handset 10A, the oscillation output of the sound source oscillator 20, which is composed of a suitable square wave oscillator, for example, is supplied to the transposing frequency divider 22, which corresponds to a total of 12 keys from C to C# to be transposed. converted into a sound source signal.

These 12 sound source signals are each transposed game 1'G11-
Gt.

, G13...G2° to the octave frequency divider 24.

The octave frequency divider 24 divides the frequency of the sound source signal sent through any of the gates into octaves to be generated, and supplies the frequency to the 172 frequency divider 26.

From the output side of the 1/2 frequency divider 26, a sound source signal corresponding to each note name to be sounded is outputted and supplied to a switching circuit (not shown).

By the way, in order to achieve the purpose of transposition, gate G1
□, G□2. G□3...G, 22 may be controlled so as to be in a signal transmission enabled state.

In this embodiment, unlike the conventional example, gates G11. G1゜, G□3...
...G22 is not controlled, and each gate is controlled by the output of the parent instruction priority circuit 30.

The parent instruction priority circuit 30 receives one switching position output of the transposition control switch S10 at one input terminal of each, and a NOR gate OGo at the other input terminal of each of the parent instruction priority circuits 30.
12 AND gates AG1 each receiving the output of
．． AC3, AC3...AG1□, and 12 OR gates oG1 each receiving the output of these AND gates at one input terminal and the output of the decoder 28 at each other input terminal. ．． OG2. O
G3... Contains OG1□.

The decoder 28 receives the transposition control signal, which is a 4-bit digital signal from the encoder EN□, and decodes it.This decoded output is also supplied to the NOR gate OGo through an input connection indicated by a circle M.

The outputs of OR gates OG1 to OG□2 are respectively supplied to control input terminals of transposition gates G□ and -G22.

According to the above configuration, when the transposition command of the transposition control switch S1 on the base unit side of the slave unit 10A and the transposition command of the transposition control switch S10 of the slave unit 10A have different contents, the master unit side Transposition commands can be prioritized.

In other words, is each transposition control switch S□? Assuming that StO is in the switching position shown, the OR gate O
One input of G2 and one input of NOR gate 0G1o become "1" level.

On the other hand, one input of AND gate AG is also 441 I9
However, since the AND gates AG□ to AG12 are all inhibited by the output of the NOR gate OGo, the output of the AND gate AC□ cannot obtain the "°1" level, and only the output of the RρR gate oG2. “1”
level, and the transposition control signal is preferentially output from the transposition control switch S1.

Therefore, the gate G controlled by the output of the OR gate OG2
1□ becomes ready for signal transmission, and the sound source signal corresponding to the B key is supplied to the octave divider 24 via this gate G1□, and the transposition of the key specified by the parent is distantly performed.

Note that if switch S□ is switched to contact a, switch S
It is clear that the transposition (to the key of C in this example) can be performed as instructed by 1o.

As described above, since the transposition control device according to this invention is equipped with a parent instruction priority circuit, it is possible for the parent unit to forcibly set the key to be played on the slave unit, which greatly improves teaching efficiency. It is something that can be done.

Next, another embodiment of this invention will be described with reference to FIG.

The feature of the transposition control device of this example is that instead of providing a transposition control switch for each slave unit on the base unit side, it has one transposition control switch and one slave unit selection switch. The aim is to achieve the same purpose as in the case shown in the figure.

That is, the main unit side is provided with a transposition control switch S11 operated with a knob nll, and a slave unit selection switch S1□ operated with a knob n12.

The switch S1□, like the one in the previous example, has a switching contact a that is not connected anywhere, switching contacts b1 to b12 of the 1st class corresponding to the key to be transposed, and switching contacts b1 to b1 of the 121st class. The transposition control signal taken out from b12 is converted into a digital code signal by encoder EN1□.

In addition, a switch S1 having switching contacts corresponding to the number of handsets
The switching position output of □, that is, the handset selection signal, is also converted into a digital code signal by the encoder EN1°.

Encoder EN□1゜ENl.

, the outputs of gate circuits GT11. GT1□ and these gate circuits GT1□ and GTl.

A transmission control switch S is provided at the control input terminal of.

A transmission control signal is applied from.

Switch S. Turn on the transmission control signal “°1′”
When the level is set, each gate circuit GT1□GT□2 becomes in a signal transmission enabled state, and transmission of a transposition control signal and a slave unit selection signal to the slave unit side becomes possible.

The handset side has almost the same configuration as described above with reference to FIG. 1, and the same parts as in FIG. 1 are designated by the same reference numerals.

Here, parts that are different from the apparatus shown in FIG. 1 will be explained in particular.

A gate circuit GT1□ is connected to one input terminal of the comparator circuit 25.
A handset selection signal P is inputted through the handset 10A, and a handset code signal Q specified for the handset 10A is inputted to the other input terminal.

On the other hand, a transposition control signal is supplied from the gate circuit GT to the latch circuit 27 which is reset by the reset switch R3, and this latch circuit 27 receives a coincidence signal generated from the comparator circuit 25 when the comparators P and Q match. Latch the transposition control signal according to the EQ.

Decoder 28 receives this latch output and decodes it.

The decode output is input to the parent instruction priority circuit 30 as in the previous example, and due to the priority output action of this circuit 30, it is given priority to the transposition control signal from the slave side transposition control switch S1o and is sent to the transposition gates 0□1 to G2□. Supplied.

According to the embodiment shown in FIG. 2 described above, there are two switches S11. Since it is only necessary to provide S2, there is a practical benefit of simplifying the configuration.

This point is particularly advantageous when there are a large number of slave devices.

Note that the transposition control switch S may also be used for transposition control of the parent electronic musical instrument, as described in the previous example.

Figure 3 shows a further embodiment of this invention, in which an electronic musical instrument having a voltage-controlled oscillator (VCO) as a sound source oscillator is placed in the child unit, and this invention is applied to the sound source circuit of the electronic instrument. An example is shown below.

The transposing resistor 40 has voltage take-out points corresponding to 12 keys to be transposed, and from each voltage take-out point, one of the keys of C to C# is connected.
Twelve voltage level signals taken out corresponding to the key of No. 2 are supplied to a pitch voltage generating resistor 42 via corresponding transposing gates 011 to G2°.

A key switch circuit 44 including a large number of key switches corresponding to each note name is connected to this resistor 42, and the tone high voltage corresponding to the key switch turned on is connected to the VCO.
46 control input terminals.

The oscillation frequency of the VCO 46 is controlled by the pitch voltage specified for each note name.

The sound source signal as the output of the VCO 46 is supplied to a voltage-controlled timbre filter (VCF), etc., which will be described later.

The outputs of the parent instruction priority circuit 30 mentioned above are gates 011 to G.
It is applied to the 2° control input terminal to control the opening/closing operation of each gate.

According to the above configuration, the gates 01□ to G2° can be controlled by the transposition control signal from the decoder 28 on the parent unit side, which is given priority over the transposition control signal from the switch SIO. It is clear that this can be achieved.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a transposition control device according to one embodiment of this invention, FIG. 2 is a circuit diagram showing a transposition control device according to another embodiment of this invention, and FIG. 3 is a voltage control device as a sound source oscillator. FIG. 7 is a circuit diagram showing still another embodiment in which this invention is applied to a slave sound source circuit having a type oscillator. 10A, IOB, IOC... Child unit, 20...
...Sound source oscillator, 22...Transposition frequency divider, 3
0...Parent instruction priority circuit, S□ to S3. SLo,
S1□...Transposition control switch, S12...
...Slave unit selection switch, 0□1~G2゜...Transposition gate.

Claims (1)

[Scope of utility model registration request] The electronic musical instrument is equipped with at least one base unit and a plurality of slave units each connected to the base unit for communication regarding performance training information, and each electronic musical instrument of the base unit and each slave unit has transposition. In a group performance training device, each of which is provided with a transposition circuit that transposes a musical tone to be performed in accordance with a transposition control signal from a control switch, receiving a transposition control signal from the base unit and a transposition control signal in each slave unit. At the same time, when these transposition control signals instruct transposition to different keys, each slave unit is provided with a priority circuit that preferentially outputs the transposition control signal of the base unit, and each slave unit . A transposition control device, characterized in that each of the transposition circuits is controlled according to a transposition control signal output from each of the priority circuits.