JPS6016960Y2 - Automatic rhythm playing device for electronic musical instruments - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an automatic rhythm performance device for an electronic musical instrument that allows the expression of rhythm performance sounds to be controlled by key touches.

2. Description of the Related Art An automatic rhythm performance device is incorporated into an electronic musical instrument, and the electronic musical instrument is performed in accordance with the automatic rhythm performance sound.

This automatic rhythm performance device is equipped with a tempo oscillator whose oscillation frequency is variably controlled as appropriate, and appropriately counts the oscillation signal from the tempo oscillator and converts it into a plurality of sequential pulse signals whose period etc. change sequentially. By combining these sequential pulse signals in a matrix, ROM, etc.,
Forms rhythm pattern signals of various rhythms.

Then, the rhythm sound source circuit is driven by the rhythm pattern signal selected by the selection designation operation to obtain a predetermined automatic rhythm performance sound.

Further, the rhythm pattern signal is used not only for the rhythm sound source as described above, but also for rhythm control of accompaniment sounds such as chord chords and bass sounds selected in response to operations on the keyboard section.

In such an automatic rhythm performance device, the rhythm tempo is set by variable control of the oscillation frequency of the tempo oscillator, the rhythm pattern is set by rhythm select operation, pattern conversion specification operation, and tone, volume, etc. is set in advance.

That is, during normal performance, it is virtually difficult to control the rhythm tempo, rhythm pattern, timbre, volume, etc., and it is not possible to modulate the rhythm or change the rhythm to suit the musical idea.

Therefore, the performance tends to be very monotonous.

This idea was made in view of the above points, and during normal electronic musical instrument performance, the tempo of the rhythm performance sound,
The purpose is to provide an automatic rhythm performance device for an electronic musical instrument that can effectively control patterns, timbres, volume, etc. by key touch, and express a wide variety of rhythm performance sounds. Detects the key touch status,
This detection signal determines the tempo frequency, rhythm pattern, tone,
At least one of the volume and the like is variably controlled.

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

FIG. 1 shows its configuration. Numeral 11 is a sound source circuit that generates sound source signals corresponding to each pitch, and the sound source signal from this sound source circuit 11 is transmitted to the melody opening/closing circuit 1.
2 and an accompaniment tone opening/closing circuit 13, respectively.

The melody opening/closing circuit 12 is controlled in response to the performance operation of the upper keyboard 14 of the electronic musical instrument, opens and closes the sound source signal generated by the melody played by the upper keyboard 14, and the timbre forming circuit 15 forms a tone as appropriate to produce musical sounds. signal, amplifier 16
lead to.

Further, the accompaniment sound opening/closing circuit 13 is controlled by a lower manual keyboard 17 for performing accompaniment performance.
For example, a single key operation with a single finger is performed to specify a chord chord.

Then, the chord detecting circuit 18 detects the operated key of the lower hand keyboard 17, selects the chord constituent tone whose root tone is the pitch of the operated key, and further selects the base tone of 1° and 5°, and controls the opening/closing circuit 13. It is.

For example, if the C key is operated on the lower keyboard 17, the chord detecting circuit 18 specifies the chord constituent tones of C, E, and G with C as the root note, as well as the base tones of C and G, and the opening/closing circuit 13, a chord chord signal consisting of the three tones C, E, and G, and a bass tone signal of C and G having a relationship of 1° and 5° are derived by opening and closing.

The chord chord signal and bass tone signal taken out from the opening/closing circuit 13 are sent to gate circuits 19 and 20, respectively.
The signal is then synthesized via tone forming circuits 21 and 22 and led to an amplifier 23.

From this amplifier 23, an accompaniment sound signal corresponding to the operation of the lower keyboard 17 is obtained, and this accompaniment sound signal, together with the melody sound signal from the amplifier 16, is transmitted through a tone volume 24.25, respectively. Expression device 26 is supplied.

Then, after being appropriately amplified by an amplifier 27, the signal is introduced to a speaker 28, and the player sounds it.

Additionally, this device is provided with a tempo oscillator 29 for automatic rhythm generation.

The tempo clock signal obtained from this oscillator 29 is supplied to a counter 30 as a counting signal and also to a rhythm pattern forming circuit 31, where the rhythm pattern forming circuit 31 generates chord chords, 10 , 5° bass tone rhythm pulse signal is generated and the gate circuits 19 and 20 are controlled so that the rhythm performance of the above-mentioned chord chord and bass tone is automatically performed.

Further, the counter 30 performs binary counting of the clock signal from the coupled tempo oscillator and generates a plurality of sequential pulses having different periods, and these sequential pulses are processed into a rhythm pattern forming circuit 32 consisting of, for example, a ROM. Rhythm pattern signals corresponding to each type are formed.

The rhythm pattern signal formed by this rhythm pattern forming circuit 32 is supplied to a rhythm selector 33, which selectively derives a type of rhythm pattern signal selected and designated by a rhythm selection switch 34, and this selected derived rhythm pattern The signal controls a rhythm sound source circuit 35 consisting of various rhythm sound sources such as drums and cymbals.

That is, this rhythm sound source circuit 35 is configured to obtain a rhythm performance sound signal specified by the rhythm selection switch 34, and this rhythm performance sound signal is appropriately amplified by an amplifier 36 and sent to the expression device 26 via a tone volume 37. Synthetic leather is used to make it pronounced.

Further, a key touch level detection device 38 is provided for the lower keyboard 17.

This device 38 generates an output signal when the operating touch force exceeds a predetermined value during a key operation on the keyboard 17, and is configured as shown in FIG. 2, for example.

That is, numeral 39 is a wall that is held in the raised position by a spring mechanism (not shown), and the key 39 is set in the raised position by a locking member 41 provided on the frame 40 and is pressed down.

The lower surface of this key 39 has first and second actuators 4.
2.43 is formed and drives the first actuator 42 key switch 44.

The second actuator 43 hits a stopper 46 supported by a spring mechanism 45 on the frame 40 to suppress the lowered position of the key 39.

That is, when the key 39 is operated, the first actuator 42 closes the contacts 44 a and 44 b of the key switch 44 in accordance with the MJJ operation, and generates an operated key pitch signal to the chord detection circuit 18 . Then, the second actuator 43 is lowered until it hits the stopper 46.

Further, in relation to the stopper 46, contact points 47a and 47b are provided between the stopper 46 and the fixed portion of the frame 40, and the stopper 46
When the key 39, which has been temporarily restrained at step 6, is lowered by further applying force against the spring mechanism 45, the contacts 47a and 47b are closed, and a key touch detection signal is obtained.

The detection signal from this key touch level detection device 38 is transmitted to the tempo oscillator 29 and the rhythm pattern forming circuit 32.
, the rhythm sound source circuit 35, and the amplifier 36 as control commands.

In other words, in an electronic musical instrument configured in this way,
As mentioned above, the keyboard section is divided into an upper keyboard 14 for melody and a lower keyboard 17 for accompaniment, and the opening/closing circuit 12 of the upper keyboard 14 is controlled in response to key operations. A sound source signal corresponding to the pitch of the operating key is opened/closed, shaped into a timbre by the timbre forming circuit 15, and produced from the speaker 28 as a melody performance sound.

In the lower keyboard 17, the operating key is detected by the chord detection circuit 18, and the chord chord composition sound source signal corresponding to the operating key and the bass tone signal are extracted from the opening/closing circuit 13, and the gate circuit 19. 20, the rhythm pulses for chord and bass are respectively derived from the rhythm pattern forming circuit 31.

That is, sound source signals corresponding to the rhythms of chord chords and bass notes are extracted, and are shaped into timbres by timbre forming circuits 21 and 22, respectively, so that automatic rhythmic performance of chord chords and bass notes is performed from the speaker 28. It is what it is.

At this time, the oscillator 29 is operating independently of the above-mentioned playing of the melody, chord chord, and bass tone, and in response to the oscillation clock signal from the oscillator 29, a rhythm pattern signal is sent from the rhythm pattern forming circuit 32. is generated, a rhythm pattern signal of the type corresponding to the selection designation of the rhythm selection switch 24 is taken out from the rhythm selector 33, and the rhythm sound source 35 is driven.

That is, the rhythm sound source 35 outputs a selected type of rhythm sound signal at a set tempo, and after this rhythm sound signal is appropriately amplified by the amplifier 36, it is output from the speaker 28 as an automatic rhythm performance sound. will be done.

That is, the keyboard section is operated in accordance with this automatic rhythm performance, and the melody, chords, and bass notes are played. However, the touch level detection device 38 monitors the touch intensity of the lower keyboard 17. Because
When a key operation is performed on the lower keyboard 17 with a strength equal to or higher than a predetermined strength, a detection signal is obtained from the touch level detection device 38.

The tempo oscillator 29 changes the tempo cycle of the output clock signal when there is a detection signal from the touch level detection device 38.
For example, the tempo oscillator 29 is configured as shown in A of FIG.

That is, the oscillation clock signal from the oscillator 29a is
It is supplied directly to the switch circuits 29c and 29d via the 7m frequency dividing circuit 29b.
9c is controlled to be conductive when a touch detection signal exists, and the switch circuit 29d is controlled to be conductive by the output of the inverter 29e when a touch detection signal is not present.

Therefore, according to this means, if the lower keyboard 17 is operated with a weak key touch, there is no touch detection signal, and the output clock signal from the oscillator 29a is directly coupled to the counter 30, and if the key is operated with a strong key touch, the touch detection signal does not exist. If the detection signal is present, a slow cycle tempo signal whose frequency is divided by 17 m is supplied to the counter 30.

Therefore, by consciously performing strong key operations on the lower hand keyboard 17, the tempo of the automatic rhythm can be switched to a slower one.

Further, the tempo oscillator 29 is configured as a voltage-controlled variable frequency oscillator 29f as shown in FIG. 3B, and the oscillation is normally controlled by the voltage set by the variable resistor VR1.

Then, this oscillation control voltage may be variably controlled by a variable resistor VRZ section, and this variable resistor VR2 may be controlled by a touch detection signal.

For example, it can be realized by relay control or switch element control means such as FET.

Further, the rhythm pattern forming circuit 32 section is configured with two sets of rhythm pattern forming circuits 32a and 32b as shown in FIG. Let them choose.

In this selector 32c, a signal from the rhythm pattern forming circuit 32a which normally sets a normal rhythm pattern is guided to the rhythm selector 33, and when a touch detection signal from the touch level detection device 38 is present, a rhythm pattern is formed. The variation pattern from the circuit 32b is selected and guided to the rhythm selector 33, and the rhythm pattern can be switched and set depending on the key touch level on the lower keyboard 17.

The touch detection signal from the touch level detection device 38 is further applied to a rhythm sound source circuit 35, and this sound source circuit 35 is used for bass drums, snare drums, cymbals,
..., etc., one of which is configured as shown in FIG. 5, for example.

That is, the drive signal from the rhythm selector 33 corresponding to the rhythm sound source is transmitted to the transistor T.
The noise signal is detected in accordance with the drive signal by controlling the diodes DI and D2 as switches.

Then, this noise signal is amplified by a transistor Tr2, and a timbre is formed by a filter circuit F to be extracted as a rhythm sound source signal corresponding to the rhythm pulse.The capacitors C1 and C2 forming the filter circuit F are
one of them is selected by a touch detection signal, and the tone color of the output rhythm sound source signal can be switched and selected.

That is, by touching a key on the lower keyboard 17, the tone of the rhythm performance sound is switched and selected.

In addition, the rhythm sound source is a transistor Tr3 as shown in FIG.
In the case of an oscillator circuit configured by an oscillator circuit, the capacitors C3 and C4 constituting the time constant circuit may be switched and selected by a touch detection signal.

Furthermore, the amplifier 36 is a voltage controlled variable gain amplifier (VC
If A) is configured and the amplification gain is controlled to increase, for example, by the touch detection signal, it is possible to express the automatic rhythm performance sound with a strong beat by strongly touching the key on the lower keyboard 17. Become.

That is, by performing strong touch control when operating keys on the lower keyboard 17 that controls accompaniment sounds, the rhythm tempo,
It is possible to switch and control the rhythm pattern, rhythm tone, and rhythm intensity, and it is also possible to variably control the performance expression of the automatic rhythm performance sound.
You will be able to perform automatic rhythm performances that match the performance idea.

In this case, in the embodiment, the tempo, pattern, tone, and volume are all controlled simultaneously by key touch, but this can be set arbitrarily, and by controlling at least one of them. , the ability to express rhythm is significantly improved.

Further, the key touch detection device 38 is not limited to detecting the pressing strength as in the embodiment, but may be a means for detecting the lateral movement of the key. It is also possible to have a structure in which all keys are shared, rather than being provided for each key.

As described above, according to this invention, automatic rhythm performance allows the tempo, pattern, timbre, volume, etc. to be variably controlled by key touch operations on the electronic musical instrument, and the state of the song played on the electronic musical instrument can be controlled. It is possible to control arbitrary rhythm expression according to the rhythm, and it has a very large effect on improving the expressive power.

[Brief explanation of drawings]

FIG. 1 is a block diagram illustrating an automatic rhythm performance device according to an embodiment of the invention, FIG. 2 is a schematic partially sectional side view showing an example of a key touch detection device used in the above embodiment, and FIG. 4A and 6B are diagrams each showing an example of a tempo oscillator, FIG. 4 is a diagram similarly showing an example of a rhythm pattern forming section, and FIGS. 5 and 6 are diagrams respectively showing an example of a rhythm sound source. 11... Sound source circuit, 12, 13... Open/close circuit, 14... Upper keyboard, 17...
Lower keyboard, 29... Tempo oscillator, 30...
... Counter, 31, 32 ... Rhythm pattern forming circuit, 33 ... Rhythm selector, 35.
...Rhythm sound source, 36...Amplifier, 38
...Key touch detection device.

Claims (1)

[Scope of utility model registration request] a tempo oscillator, means for forming a rhythm pattern signal based on the oscillation clock signal from the tempo oscillator, and a rhythm sound source circuit driven by the rhythm pattern signal;
a touch detection device that detects a specified touch state of an accompaniment keyboard; and a touch detection device that is provided corresponding to at least one of the tempo oscillator, rhythm pattern forming means, and sound source circuit, and that clocks the clock based on the detection signal from the touch detection device. An automatic rhythm performance device for an electronic musical instrument, comprising means for variably controlling at least one of a signal frequency, a rhythm pattern state, and a rhythm tone color.