JPS6210799Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electronic musical instrument that controls the correlation between modulation effects such as rhythmic chords and wah-wah based on automatic rhythms and tremolo effects.

In the case of electronic musical instruments, musical tones are generated by generating musical tone signals corresponding to key operations and driving a speaker circuit with these musical tone signals. When adding effects, mechanical means such as rotating a speaker that generates musical sounds, or electronic amplitude modulation means are used. That is, by creating waves in the volume and timbre of the musical tones played, a tremolo effect is expressed and the expressiveness of the performance is given characteristics.

In addition, electronic musical instruments are now combined with an automatic rhythm device that automatically generates rhythm sounds, and the rhythm signals generated by this automatic rhythm device are used to control key operations. It has been considered to control the musical tone signals obtained accordingly. For example, chord chords obtained in response to key operations are intermittent in accordance with the rhythm, so that rhythmic chord chord performances are automatically expressed, and musical tone signals are generated at intervals corresponding to the rhythm. It has been considered to modulate the timbre and create a special musical sound effect such as a wah-wah effect.

However, when a tremolo effect is further added to a musical tone signal to which a modulation effect corresponding to the automatic rhythm has been added, the musical tone signal becomes in a state where it is modulated overlappingly at different periods and in different states.
This results in a performance sound that is audibly unpleasant, which is extremely undesirable in terms of musical sound expression. For this reason,
Performance sounds require special operations, such as stopping the rhythmic performance of chord chords, especially when adding a tremolo effect.

This idea was developed in view of the above points, and is an electronic musical instrument that ensures that a modulation effect, including a tremolo effect, is expressed in the performance sound with sufficient auditory pleasure. A modulation circuit that adds a modulation effect corresponding to an automatic rhythm to a musical tone signal corresponding to a key operation, and a tremolo effect adding device are provided, and a system that responds to an operation command of the modulation circuit is provided. The operation command of the tremolo effect adding device is inhibited and controlled.

An embodiment of this invention will be described below with reference to the drawings. Figure 1 shows its configuration, with keyboard 1
1, a musical performance operation is performed, a tone generator circuit 12 is controlled by a keying signal corresponding to the key operation, and a tone source signal corresponding to the key operation is generated from the tone generator circuit 12. The musical tone signal generated from this tone source circuit 12 is supplied to a modulation circuit 13, and a modulation effect is added thereto. The modulation circuit 13 includes, for example, a gate circuit 15 selected by a selection switch 14 and a voltage-controlled variable filter 16 (hereinafter abbreviated as VCF). Control and also VCF
16, the tone color is modulated and controlled in response to the control signal. The musical tone signal taken out from this modulation circuit 13 is supplied to the first and second speakers 19 and 20 via gates 17 and 18 each made of an FET or the like, so that it is produced as a performance sound. . In this case, the first speaker 19 is set with its sound emission direction fixed and generates normal musical tones, while the second speaker 19
A guide rotating body 22 that is rotated in the sound emission direction by a motor 21 is provided on the front surface of the speaker 20 to constitute a tremolo effect adding device 23.

Such an electronic musical instrument is further provided with a tempo oscillator 24 for generating automatic rhythms. The oscillation frequency of this tempo oscillator 24 is variable controlled by adjusting the tempo speed, and its oscillation clock signal is supplied to a counter 25 for counting. The counting operation of this counter 25 is controlled by a switch 26 for automatic rhythm control, and when this switch 26 is open, a signal "1" is given to the counter 25 as a reset command.
The counting operation of this counter 25 is stopped. Then, when the switch 26 is turned on, the above signal is set to "0" and the counter 25 is set to the counting drive state.
Generates multi-bit binary count value information from
This count value information is supplied to the rhythm pattern memory 27. The rhythm pattern memory 27 is, for example,
It is composed of a ROM and generates various rhythm pattern signals by sequentially detecting and combining binary counting bit information with different periods, and outputs rhythm pattern signals of the rhythm type corresponding to the selection command from the rhythm type selector 28. Then, this rhythm pattern signal drives a rhythm sound source circuit 29 to generate a rhythm sound source signal of the selected rhythm type, whose level is appropriately controlled by a tone volume 30, and is supplied to the first speaker 19. Make it sound as an automatic rhythm performance sound.

Simultaneously with the rhythm pattern signal, a rhythm pulse signal RP of a basic rhythm beat corresponding to the selected rhythm type is generated from the rhythm pattern memory 27, and this rhythm pulse signal RP is appropriately attacked by the waveform shaping circuit 31. Shape into a waveform,
The gate circuit 1 of the modulation circuit 13 serves as a control signal.
5 and VCF16.

The signal related to the rhythm control switch 26 is also supplied to the AND circuit 32 as a gate signal. This AND circuit 32 is supplied with a signal from a tremolo switch 33. This switch 33 is turned on when issuing a command to add a tremolo effect, and gives a signal "1" to the AND circuit 32. The output signal from the AND circuit 32 gives a gate command to the gate 18 and also outputs a gate command to the inverter 34.
The gate 17 is controlled via the gate 17.

FIG. 2 shows an example of the configuration of the rhythm pattern memory 27 and the rhythm type selector 28. For example, the counter 25 corresponds to each note length of a whole note, half note, quarter note, and eighth note. do 4
Bit binary count value information is obtained, and this 4-bit information and a signal inverted by an inverter are coupled to lines L ₁ to _{L 8} of the matrix forming the rhythm pattern memory 27. Then, the AND circuit A1 detects the condition in which all the inverter outputs are "1", that is, the initial state in which the count value of the counter 25 is "0", and the OR circuit
The control signal output is obtained through OR. Therefore, when the switch 26 is opened and the automatic rhythm performance is stopped, the output of the OR circuit OR is held at "1", and the signal to the modulation circuit 13 obtained from the waveform shaping circuit 31 is "1". ” is maintained.

Furthermore, when the rhythm type selector 28 selects, for example, a two-beat "march", the AND circuit A2 determines the state in which the input 4-bit information is "1110".
is detected, and a two-beat rhythm pulse signal RP is extracted from the OR circuit OR along with the count information "0000". Similarly, when the rhythm type selector 28 selects the 4-beat "begin", the count information of the counter 26 becomes "1110" and "0011" in the AND circuits A3, A4, and A5, respectively.
When the state of "1011" is detected, it is taken out from the OR circuit OR ₁ , and a four-beat rhythm pulse signal RP is taken out through the OR circuit OR together with the counting time of "0000".

That is, in the electronic musical instrument configured as described above, when obtaining a normal performance sound without adding a tremolo effect, the tremolo switch 33 is in an open state, and therefore the output signal from the AND circuit 32 is is "0" and the inverter 34 to gate 1
7 is set to a state where a gate signal is given.

Therefore, the musical tone signal obtained in response to the performance operation of the keyboard 11 is supplied to the first speaker 19 via the modulation circuit 13 and the gate 17.
Performance sounds can be obtained under normal conditions.

When the switch 26 is turned on in this state, the counter 25 counts the clock signal from the tempo oscillator 24, and a rhythm pattern signal of the type selected and specified by the rhythm type selector 28 is generated from the rhythm pattern memory 27. An automatic rhythm sound source signal is generated from the rhythm sound source circuit 29.
That is, the automatic rhythm performance sound can be obtained from the speaker 19.

At the same time, a rhythm pulse signal corresponding to the selected rhythm type is sent from the rhythm pattern memory 27.
The RP is generated, shaped into an attack envelope as appropriate by the waveform shaping circuit 31, and supplied to the modulation circuit 13. Here, in the modulation circuit 13, switch 1
4 is input to the gate circuit 15 side as shown in the figure, the signal corresponding to the key operation from the sound source circuit 12 is supplied to the gate circuit 15. and,
This gate circuit 15 receives the above-mentioned rhythm pulse signal.
It is gated according to the RP,
Therefore, the output musical tone signal from the modulation circuit 13 is controlled intermittently in accordance with the rhythm pulse RP, and the speaker 19 generates a rhythmic performance sound corresponding to the key operation. .

Therefore, by operating the keys on the keyboard 11 corresponding to, for example, a chord chord, a rhythmic playing sound of the chord chord can be obtained from the speaker 19. In this case, as described above, since the addition of the tremolo effect is not controlled, no performance sound can be obtained from the speakers 20.

In this case, although not particularly shown in the embodiment, it is effective if the melody performance sound is supplied to the speaker 19 without passing through the gate circuit 15 when rhythmic chords are being played. be.

When a modulation signal is to be applied to the modulation circuit 13, the switch 26 is turned off as described above.
has been introduced. Therefore, the AND circuit 32
is given a signal of "0" from the switch 26, so even if the switch 33 is turned on to add a tremolo effect in this state, the output signal from the AND circuit 32 will not rise. do not have. That is, when the modulation effect corresponding to the rhythm of the performance sound is added, the gate 17 is opened and the gate 1 is opened.
No musical tone signal is supplied to the speaker 20, which is closed to produce a tremolo effect.

Only when the switch 26 is opened and rhythm control is stopped, a signal "1" is obtained from the AND circuit 32 in response to the closing of the switch 33, closing the gate 17 and opening the gate 18. That is, the musical tone signal obtained in response to the key operation is supplied to the speaker 20 via the gate 18, and the direction of the sound emitted from the speaker 20 is rotated by the guide rotor 22 rotated by the motor 21.
This makes it possible to obtain a performance sound with an effective tremolo effect added to it.

In this case, the counter 25 is reset when the switch 26 is opened, and the signal "1" rises and is held from the rhythm pattern memory 27 as explained in FIG. Therefore, the waveform shaping circuit 31 always outputs "1" to the modulation circuit 13.
A modulation signal is given to the modulation circuit 13, and a musical tone signal that is not modulated is taken out from the modulation circuit 13.

In addition, when modulating the modulation circuit 13 with a pulse signal corresponding to the above-mentioned rhythm, if the switch 14 is switched from the state shown in the figure and the VCF 16 side is turned on, the harmonics of the musical tone signal obtained in response to the key operation will be The content state is controlled to change in accordance with the rhythm pulse RP in the VCF 16, so that a musical tone signal with a modulated timbre and a wah-wah effect added can be obtained.

As described above, according to this invention, when the rhythmic modulation effect corresponding to the automatic rhythm performance sound is to be added to the musical sound, the addition control of the tremolo effect is not performed, and the tremolo effect is not added, which gives a pleasant audible sensation. The resulting modulation effect can now be reliably expressed, and its practical effects are remarkable.

Note that the means for obtaining a tremolo effect in an electronic musical instrument is not limited to the rotating speaker system as in the embodiment, but may also be a tremolo effect device 23a that electronically switches speakers, and these points can be configured arbitrarily. . Further, the modulation circuit is not limited to the gate circuit, VCF, etc. as in the embodiment, but also pitch pitch modulation, etc. can be considered.

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating an electronic musical instrument according to an embodiment of the invention, and FIG. 2 is a diagram illustrating the rhythm pattern memory section in the above embodiment in more detail. 11... Keyboard, 12... Sound source circuit, 13... Modulation circuit, 17, 18... Gate, 19, 20...
Speaker, 23...Tremolo effect adding device, 24
...Tempo oscillator, 25...Counter, 26...
switch (rhythm control), 27... rhythm pattern memory, 29... rhythm sound source circuit, 33... switch (tremolo control), 34... inverter.

Claims (1)

[Scope of utility model registration request] means for generating a musical tone signal corresponding to a key operation; a musical tone modulation circuit for adding a modulation effect to the musical tone signal; an automatic rhythm generating means for supplying a modulation signal to the modulation circuit; and an output from the modulation circuit. An electronic musical instrument comprising: a tremolo effect adding device for adding a tremolo effect to a played musical tone to which a musical tone signal is supplied; and means for prohibiting and controlling the operation of the tremolo effect adding device in a modulation operating state of the modulation circuit.