JPS6220873Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electronic musical instrument, in particular, is provided with an adapter device having a built-in musical tone forming means so as to be able to selectively generate a plurality of musical tones.

Conventionally, electronic musical instruments that generate a key code signal to identify the pressed key each time a key is pressed and synthesize musical tones based on that key code signal have been widely used in the form of electronic organs, for example. It is provided.

However, this type of electronic musical instrument only has one type of musical tone forming means, so if you need other musical instrument sounds or if you want to teach other musical instruments, for example, you can use an electronic musical instrument exclusively for strings. It is necessary to use a voltage-controlled electronic musical instrument such as a music synthesizer with free tone settings. This means that it is necessary to have multiple types of electronic musical instruments even though they are the same keyboard instrument, which has the drawback of increasing purchasing costs and increasing installation space.

The purpose of this invention is to eliminate such drawbacks and provide an improved electronic musical instrument that can selectively generate a plurality of musical tones.

The electronic musical instrument according to this invention includes an electronic musical instrument main body, an adapter device, and a transmission means.

The main body of the electronic musical instrument includes a keyboard, a detection means for detecting key operation information from the keyboard, a first musical tone forming means for generating a musical tone signal based on the detected key operation information, and the first musical tone forming means. and an acoustic converting means for converting musical tone signals from the oscilloscope into acoustic signals.

The adapter device includes a second musical tone forming means that generates a musical tone signal in response to a control input, a first mode that selects an externally input musical tone signal, and a second mode that selects a musical tone signal from the second musical tone forming means. a signal selection means for selecting a signal in a mode designated by mode designation information among the mode and a third mode for simultaneously selecting an externally input musical tone signal and a musical tone signal from the second musical tone forming means; For example, a mode specifying means such as a changeover switch is provided for specifying an arbitrary mode among the modes and supplying mode specifying information to the signal selecting means.

The transmission means transmits the key operation information detected by the detection means to the second musical tone forming means as a control input, and transmits the musical tone signal from the first musical tone signal forming means to the signal selection means as an external input musical tone signal. The musical tone signals selected by the means are respectively transmitted to the acoustic converting means in place of the musical tone signals from the first musical tone forming means, and are constituted by, for example, connection cables.

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

FIG. 1 shows an electronic musical instrument according to an embodiment of this invention, in which 10 is an electronic organ body, 11 is a power cord, 12 is a speaker, 13 is a keyboard lid, 1
4 is an adapter device placed on the organ main body 10 and has a built-in musical tone forming circuit, etc.; 15 is a control operator such as a tone setting knob arranged on the panel surface of the adapter device 14; and 16 is the adapter device 14 and the main body. 10, 17a and 17b are connectors provided at both ends of the connection cable 16,
18 is a lid for the socket of the connector 17a.

FIG. 2 shows the internal structure of the organ main body 10 and the adapter device 14 described above. In the organ main body 10, 20 is a keyboard circuit including a large number of keys and key switches linked thereto; 21;
is a key code generator that generates a key code signal KC and a key-on signal KON. In the key code generation section 21, 22 is a key press detection circuit that sequentially and cyclically scans a large number of key switches to detect which key is being pressed; 2A and 2B respectively represent signal generation circuits that form a key code signal KC and a key-on signal KON based on the figure.

The key code signal KC and key-on signal KON sent from the signal generation circuit 23 are supplied to a tone forming circuit (24). The musical tone forming circuit 24 forms a musical tone signal having, for example, an organ tone at a pitch corresponding to the key specified by the key code signal KC, and sends the musical tone signal to the key-on signal KON.
The signal is sent while the key is on. The musical tone signal from the musical tone forming circuit 24 is connected to jack J and plug P.
When the plug P is not inserted into the jack J, the tone signal is supplied to the preamplifier 25 through the jack J, and when the plug P is inserted into the jack J, the musical tone signal selected by the adapter device 14 is supplied to the preamplifier 25. Preamplifier 2
The musical tone signal amplified in step 5 is guided to a main amplifier 27 after its volume is adjusted by an expression device 26 operated by the foot. A musical tone signal output from the main amplifier 27 is converted into sound by the speaker 12. Note that the power supply circuit 28 in the organ body 10 is connected to a required circuit part in the organ body 10.
V, -V, and ground (GND) potentials are supplied, and these potentials +V, -V, and GND are also supplied to the adapter device 14 via the aforementioned cable 16.

On the other hand, in the adapter device 14, the key code signal KC and key-on signal KON sent from the organ main body 10 via the aforementioned cable 16 are used.
A musical tone formation circuit that performs musical tone synthesis based on ()
30 are provided. The musical tone forming circuit 30 may be any circuit as long as it can operate based on the keyboard information KC, KON, and for example, a musical tone forming circuit exclusively for strings or a voltage-controlled musical tone forming circuit may be used. The musical tone signal from the musical tone forming circuit 30 is generated when the plug P is inserted into the jack J.
The signal is supplied to the preamplifier 25 in the organ main body 10 via a gate 31 consisting of an FET or the like and a resistor _R1 . Here, when the plug P is inserted into the jack J, the musical tone signal from the musical tone forming circuit 24 is also supplied to the preamplifier 25 after once passing through the gate 32 and the resistor _R2 in the adapter device 14. Note that each control terminal of gates 31 and 32 is connected to a resistor.
It is connected to the potential source +V via R ₃ and R ₄ .

A changeover switch 33 for controlling the gates 31 and 32 to switch musical tone signals is also provided in the adapter device 14, and an operator 33X of the switch 33 is arranged on the panel surface of the adapter device 14. Movable contacts 33a to 33c of switch 33
are both grounded, and fixed contacts corresponding to the movable contacts 33a and 33b are connected to control terminals of the gates 31 and 32.

In the electronic musical instrument having the above configuration, when the operator of the switch 33 is set to the position, the movable contact 33a
is closed and the control terminal of the gate 31 becomes approximately at ground potential, so that the gate 31 becomes non-conductive. At this time, since the potential +V is applied to the control terminal of the gate 32 via the resistor R ₄ , the gate 32 becomes conductive and transmits the musical tone signal from the musical tone forming circuit ( ) 24 to the preamplifier 25 side. Therefore, the speaker 12 emits the organ sound formed by the musical tone forming circuit 24.

Next, when the operator 33X of the switch 33 is set to the position, the movable contact 33b closes and the gate 32
The control terminal becomes almost at ground potential, and the gate 32 becomes non-conductive. At this time, since the potential +V is applied to the control terminal of the gate 31 via the resistor R ₃ , the gate 31 becomes conductive and transmits the musical tone signal from the musical tone forming circuit ( ) 30 to the preamplifier 27 side. Therefore,
The speaker 12 emits string tones and the like formed by the musical tone forming circuit 30.

Further, when the operator 33X of the switch 33 is set to the + position, the control terminals of the gates 31 and 32 are both biased with a potential of +V, so the gates 31 and 32 are both conductive, and the speaker 1
From 2 onwards, the musical tones formed by the musical tone forming circuits 24 and 32 are produced in a mixed form.

In the above embodiment, one adapter device is provided, but two or more adapter devices may be provided. In that case, it is sufficient to increase the number of tone signal switching means, etc.

As described above, according to this invention, key operation information is extracted from the electronic musical instrument body and supplied to the musical tone forming means of the adapter device, and musical tone signals generated within the electronic musical instrument body are guided to the adapter device. Either or both of the musical tone signal from the main body of the electronic musical instrument and the musical tone signal generated within the adapter device is selected according to the mode designation information based on the operation of a changeover switch etc. provided in the adapter device, and the selected musical tone signal is generated. For example, by using an adapter device that can set the tone arbitrarily, or by replacing an adapter device with a fixed tone, you can make various sounds with one electronic musical instrument. It can generate musical sounds.

Therefore, if the electronic musical instrument of this invention is used for performance or performance training, it is possible to perform with a variety of tones without installing or moving other electronic musical instruments, increasing the degree of freedom of performance. will be significantly improved.
In particular, this invention provides a mode in which the musical tone signal generated within the adapter device and the musical tone signal generated within the electronic musical instrument body are mixed and produced.
In addition to simply changing the tone, you can also enjoy the ensemble effect of multiple tones, and even a low-end machine can perform as versatile as a high-end machine. Furthermore, the increase in cost and space due to the adoption of the adapter device is extremely small compared to installing another electronic musical instrument.

Furthermore, in this invention, a signal selection means for selecting one or more musical tone signals according to the mode designation information from the changeover switch is provided in the adapter device, so the circuit configuration inside the electronic musical instrument itself does not need to be changed much. There are also some good benefits.

[Brief explanation of the drawing]

FIG. 1 is a side view of an electronic musical instrument according to an embodiment of the invention, and FIG. 2 is a circuit diagram showing the internal structure of the electronic musical instrument of FIG. 10...Electronic organ main body, 14...Adapter device, 16...Connection cable, 21...Key code generator, 24, 30...Tone forming circuit, 31,
32...Switching gate, 33...Switching switch.

Claims (1)

[Claims for Utility Model Registration] (a) A keyboard, a detection means for detecting key operation information from the keyboard, a first musical tone forming means for generating a musical tone signal based on the detected key operation information, and (b) a second musical tone forming means that generates a musical tone signal in response to a control input; and a first mode that selects an externally input musical tone signal; A second mode in which the musical tone signal from the second musical tone forming means is selected, and a third mode in which the externally input musical tone signal and the musical tone signal from the second musical tone forming means are simultaneously selected, according to mode designation information. An adapter comprising a signal selection means for selecting a signal in a specified mode, and a mode specification means for specifying any mode among the first to third modes and supplying the mode specification information to the signal selection means. Device,
and (c) the key operation information detected by the detecting means is used as the control input to the second musical tone forming means, and the musical tone signal from the first musical tone forming means is applied as the external input musical tone signal to the signal selecting means. The electronic musical instrument further comprises transmission means for respectively transmitting the musical tone signal selected by the signal selection means to the acoustic conversion means in place of the musical tone signal from the first musical tone forming means.