JPS599270Y2 - automatic accompaniment device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an automatic accompaniment device that automatically plays bass chords using one finger.

When playing an electronic musical instrument, an accompaniment performance using chord chords is often performed at the same time as the melody performance, and the chord chords are usually performed by simultaneously operating a plurality of keys with the left hand.

In order to easily play such chord chords, a switch corresponding to the chord name is provided, and in response to the operation of this switch, a plurality of sound source signals constituting a predetermined chord chord are selected and derived, and the rhythm can be played. An automatic bass chord performance that generates intermittent sound based on a pattern or the like is being considered.

However, in reality, even if you select and specify chord C using a switch, there are various chord patterns such as major and minor, and in the case of major, there are C, E,
If the G note is minor, the C, D#, and G notes are combined to perform a predetermined chord.

Therefore, in addition to the operation of selecting chord C, it is also necessary to specify one of the major and minor chord patterns.

Usually, a chord specification switch is built into the keyboard section, and chords are specified by operating the keyboard section with one finger (one finger), and chord patterns such as major and minor are specified using the expression pedal section. This can be done by means such as a switch installed in the opening or a switch installed in the opening bar.

However, when playing chords, the melody section is being played by the right hand at the same time, and expression operations must also be performed.

Therefore, it is very difficult to perform the chord pattern switching operation at the same time as the chord designation operation, and the performance performance of the electronic musical instrument cannot be fully demonstrated.

This invention improves the above-mentioned drawbacks, and provides automatic accompaniment such as automatic bass chords that allows chord designation operation along with the melody section and easy selection of chord pattern switching to enable effective electronic musical instrument performance. The present invention aims to provide a device that uses a code designation switch to select and derive a plurality of sound source signals that make up the code, detects the operating pressure of the code designation switch, and selects a code pattern based on the detected signal. It is characterized by what it did.

An embodiment of this invention will be described below with reference to the drawings.

FIG. 1 shows its structure, in which the chord designation section 11 has chord designation switches S1, S1, and S1 corresponding to each chord name.
For example, these switches S1, S2, etc. are attached to the keys of the keyboard section used for normal performance, and are turned on in response to a key operation when automatic chord performance is set, and are activated to correspond to the chord name. output signals are generated on output lines L1, L2, . . .

Then, the output line L1 from this code instruction section 11,
L2... is connected to the code gate circuit 12, and outputs sound source signals of 1°, minor (MIN) 3°, major (MAJ) 3°, and 5°, corresponding to the output line where the signal is generated. It happens.

For example, when the chord designation switch S1 corresponding to code C is turned on and a signal is generated on the output line L1, the code gate circuit 12 outputs C as a 1° signal, D# as a minor 3° signal, and D# as a major 3° signal. A sound source signal of E is generated as a signal of 5°, and a sound source signal of G is generated as a 5° signal.

Further, corresponding to the code instruction section 11, a pressing force detection element, for example, a touch response switch 13 is provided.

For example, as shown in the second figure, this switch 13 is arranged in a normally open state with a spring 15 under an operation key 14 that turns on the code designation switch S, and when the key 14 is lightly operated, the code designation switch S is turned on. Only switch S is turned on, and when it is strongly operated, switch 13 is also turned on along with switch S, and code designation switches S1 and S2
The operating pressure of ... will be detected.

When this switch 13 is turned on, a gate signal is applied to the AND circuit 16 to which the major 3° sound source signal from the chord gate circuit 12 is combined, and when it is open, the minor 3° sound source signal is combined by the inverter 17. A gate signal is given to the AND circuit 18.

Then, 1°, 3°, and 5° sound source signal outputs with major or minor chord patterns are taken out from the output terminals 19a, 19b, and 19C, and combined as appropriate.

This combined signal is controlled intermittently by a filter circuit in the form of a timbre or an autorhythm pulse, so that it is produced as an automatic bass chord performance sound.

FIG. 3 shows a specific example of the structure of the code gate circuit 12, showing a portion corresponding to the line L1 which generates an output when the code designation switch S1 is turned on.

That is, switching diodes D1, D2, which are respectively turned on when a signal rises on line L1,
D3, D4, and these diodes D1 to D4
Corresponds to output line L1 via? The sound source signals C, D#, E, and G constituting the code C are respectively derived and guided to lines 1, , ■, l3, and l4.

Then, sound source signals of chord C at 1°, minor 3°, major 3°, and 5° are output from lines 11 to 14.

Such a gate circuit is similarly provided for each of the lines L2, L3, etc., and the code designation switch S1
.

That is, according to the device configured as described above, the code designation switch S1 is operated by performing a code designation operation using a key or the like.
, S2, . . . , a sound source signal comprising a chord corresponding to the operated switch is extracted from the code gate circuit 12.

In this case, the key 14 that turns on the switches S1, S2...
If the switch S shown in FIG.

Therefore, sound source signals of 1°, minor 3°, and 5° are taken out from the output terminals 19a to 19C.

If the key 14 is strongly operated and the switch 13 is also turned on, the gate of the AND circuit 16 is opened, and the output terminals 19a to 1
From 9C, sound source signals of 1°, major 3°, and 5° are derived.

That is, the chord pattern is selected according to the operating force of the chord designation switches S1, S2, etc., and it is possible to specify not only the chord name but also the chord pattern at the same time with one finger. Chord instruction operations for performance can be executed very easily and reliably.

As described above, according to this invention, a chord can be selected and a chord pattern can be selected by a single action of pressing the operation key corresponding to the chord designation switch, and the chord pattern can be selected automatically in response to other key operations such as melody. This allows for effective accompaniment, and not only makes it possible to sufficiently simplify and enjoy the performance of an electronic musical instrument, but also has a great effect on improving the expressiveness of the performance.

[Brief explanation of drawings]

Fig. 1 is a diagram illustrating the structure of an automatic accompaniment device according to an embodiment of this invention, Fig. 2 is a diagram showing an example of the structure of a touch response switch used in the above embodiment, and Fig. 3 is a similar diagram. FIG. 2 is a configuration diagram illustrating a specific example of a code gate circuit. DESCRIPTION OF SYMBOLS 11... Code instruction part, 12... Code gate circuit, 13... Touch response switch, 14...
Operation key, SL, S2...Code designation switch.

Claims (1)

[Scope of utility model registration request] A plurality of code designation switches provided corresponding to each code name, an operation pressure detection means for detecting the operating pressure of the designation switch, a means for selecting a code pattern corresponding to the detection pressure of the detection means, 1. An automatic accompaniment device comprising: a chord sound generation circuit that generates a plurality of chord tone signals corresponding to a chord designation switch operated according to a chord pattern selected by the means.