JPH01321487A - Modulation effects device - Google Patents

Abstract

PURPOSE:To obtain modulation effects by turns by correcting the phase data of a phase data generating means so that modulation effects at the start of the sounding of each tone are in phase. CONSTITUTION:This device is provided with the phase data generating means 12 which generates phase data DPHN representing the phase of modulation effects to be given tones in common to the plural tone and an initial value memory means 13C which stores initial value data (DPH)1 corresponding to the phase data DPHN generated by the phase data generating means 12 based on sounding start signals (KONP)J of plural tones so that they readout by tones. Then Phase data at the start of the generation of each tone among the phase data DPHN are recorded in the initial value memory means 13C and the phase data DPHN are corrected with the initial value data (DPH)J. Consequently, there is no feeling of physical disorder at the start of the sounding of each tone and the modulation effects are added by the tones.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a modulation effect device, and is particularly suitable for application to multitone electronic musical instruments.

[Summary of the invention]

The present invention provides a modulation effect device for imparting modulation effects to a plurality of musical tones, in which the phase data of the phase data generation means is corrected so that the phases of the modulation effects are aligned at the start of sound generation of each musical tone. With this configuration, it is possible to obtain a modulation effect device capable of imparting a modulation effect to each musical tone.

[Conventional technology]

Conventionally, in multitone electronic musical instruments that can produce multiple musical tones at the same time, modulation effect devices that provide modulation effects such as vibrato modulation effects, tremolo modulation effects, and timbre modulation effects are used as modulation effect devices.
By providing only one modulation signal generating device in common for the plurality of musical tones, a configuration is created that allows practical modulation effects to be produced for each musical tone while taking care not to complicate the overall configuration. are used.

[Problem that the invention seeks to solve]

However, in this case, since the same modulation signal is used for each tone generation channel, it is not possible to create a modulation effect for each channel separately, so there is no sense of incongruity as if the tone is imitating the tone of a natural instrument. There is a problem with not being able to generate musical sounds.

One possible way to solve this problem is to provide a modulation signal generator that operates independently for each sound channel, but this would increase the circuit scale of the entire modulation effect device. It cannot be applied to practical electronic musical instruments.

The present invention has been made in consideration of the above points, and in order to produce an independent modulation effect for each sound channel,
This paper attempts to propose a modulation effect device that can avoid increasing the circuit scale.

[Means for solving problems]

In order to solve this problem, the present invention includes a phase data generating means 12 that commonly generates phase data DPHN representing the phase of a modulation effect to be imparted to a plurality of musical tones, and a phase data generating means 12 that commonly generates phase data DPHN representing the phase of a modulation effect to be imparted to a musical tone, and a phase data generating means 12 that generates phase data DPHN in common for a plurality of musical tones, initial value memory means 13C for storing initial value data (DPH) J corresponding to phase data DPHH generated from phase data generating means 12 based on signal (KONP) J so as to be readable for each of a plurality of musical tones; By correcting the phase data D2- with the initial value data (Dr, )J read out for each of a plurality of musical tones from the initial value memory means 13C, the modulation effect to be applied to the corresponding musical tone at the start of the generation of each musical tone. Corrected phase data (DPH
C) A correction processing means 13A for sending out J is provided.

[Effect]

Among the phase data D□8 generated from the common phase data generation means 12 for a plurality of musical tones, the phase data at the start of generation of each musical tone is set as initial value data (D, , , ) and initial value memory means. 13C, and this initial value data (D
By correcting the phase data D2□8 by PH)J, a modulation effect can be imparted to each musical tone without causing any discomfort at the start of the sound generation of each musical tone.

In this way, since the phase data generating means 12 can be provided in common for each tone, the overall configuration can be further simplified.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

[1] First Embodiment In FIG. 1, 1 indicates an electronic musical instrument as a whole, and key information S□7 of a keyboard circuit 2 is given to a key press detection/sound generation assignment circuit 3. , represents the key code signal KC representing the key code of the pressed key and the state from the time the key is pressed until the key is pressed (logical ``
1” level) and a key-on pulse signal KO, which is a pulse representing the timing of the key-on operation (representing the rising point of the key-on signal KON).
Generates NP.

In the case of this embodiment, the electronic musical instrument 1 is configured to be able to generate multiple tones, for example, eight tones, at the same time, and the key press detection/tone generation assignment circuit 3 generates key information S KEY for eight tones as shown in FIG. As shown, time slots for 8 channels Tc+u −, TcMz . . . are created based on the channel clock φ.
...-'rc, ls as one cycle, and the 1st, 2nd, . . . 8th sounding channels are repeatedly formed in a time-sharing manner, and the keys pressed for each sounding channel are The key and information S□ are assigned each time this occurs.

As shown in FIG. 2(A), the key press detection/tone allocating circuit 3 detects the time slots T of the first, second, . . . , eighth tone generation channels. , 4t (J=1.2...
Assign a key code signal (KC) to 8).

At the same time, the key press detection/sound generation assignment circuit 3 detects the timing at which the key-on signal KON changes (corresponding to the time when the key is pressed or released) and the key-on pulse signal KO.
The timing at which NP rises is determined by the channel cycle T.
The corresponding time slot TCIIJ (
A key-on signal (KON) J and a key-on pulse signal (KONP) expressed by changes in data in J = 1 to 8).

It is designed to send out.

In this way, the time slot T of the third sounding channel. A key code signal (KC) J and a key-on signal (KON) containing the key information S KEY of the key pressed in HJ are given to the musical tone generator 4, and thereby the key information S KEY of each time slot is given to the musical tone generator 4. A musical tone signal MSD obtained by synthesizing a plurality of musical tone signals based on this signal is converted into a musical tone in the sound system 5.

In addition to the above configuration, a key-on pulse signal (KONP) sent from the key press detection/tone generation assignment circuit 3 is supplied to the modulation effect control circuit 11.

In the case of this embodiment, the modulation effect control circuit 11 supplies a modulation control signal Dv□ having a vibrato modulation waveform for each sound generation channel to the musical tone generator 4,
A modulation signal phase data generation circuit 12 common to all sound generation channels is provided.

The modulation signal phase data generation circuit 12 has a clock pulse generation circuit 12B whose oscillation frequency is set by a modulation speed adjustment operator 12A, and by counting clock pulses CLK obtained at its output terminal with a counter 12C. , as shown in FIG. 3(A), the phase value for a modulation signal exhibits a change in which the phase value rises repeatedly and linearly in a sawtooth waveform shape from O(rF ) to 2π [rmd] as time passes. Data D□8 to counter 1
Get 2C at the output end.

This modulation signal phase data D given to.

A key-on pulse signal (KONP) J is applied to the selection drive signal input terminal SB of the selector 13B, and the key-on pulse signal (KONP) J reaches the logic "1" level in the third time slot Tcna (J=1 to 8). , the modulated signal phase data D PIN given to the signal input terminal B of the selector 13B is selected as initial value data and supplied to the initial value memo 'J 13 C.

The initial value memory 13C is composed of an 8-stage shift register driven by the channel clock φ, and is shifted when the channel clock φ is generated at the timing of the start of the third time slot TC)IJ (J = 1 to 8). By operating, the data given to the input terminal is taken into the first stage of the initial value memory 13C, (D□) J''-DPHN (J=1.2...8)...・・・
- Execute the process as in (1), thereby holding the initial value data (Dptt)t of the third sound generation channel. At the same time, the initial value memory 13C reads the data of the next 3Jth channel from the final stage and supplies it to the other signal input terminal A of the selector 13B.

When the key-on pulse signal (KONP) J at the selection drive signal input terminal SB is at the logic "0" level, the selector 13B selects the initial value data (
DPM) J is fed back to the first stage of the initial value memory 13C, and thus the third (J=1 to 8) initial value data (DPI4) J is dynamically circulated and stored in the initial value memory 13C. There is.

The third initial value data (DPI) J fed back to the input terminal of the initial value memory 13C is sent to the correction processing circuit 1.
3A to the subtraction input terminal, thus the correction processing circuit 1
3A is (DPHC) J = DpHN (D
PII) J (J=1.2...8)
...... As shown in (2), a correction such as subtracting the initial value data (DPI()J) from the modulated signal phase data DP)IN supplied from the modulated signal phase data generation circuit 12. The calculation is executed and the corrected phase data (DPHC) J is sent as a modulation signal generation control signal to the modulation signal generation circuit 14.

Note that the correction processing circuit 13A is configured to further add a phase value 2π to the value of equation (2) and output the result when the calculation result is a negative value.

The modulation signal generation circuit 14 includes a ROM (read □y1) that stores vibrato modulation waveform data having a sine waveform, for example.
1y memory) and corrected phase data (D
FHC) J is used as an address signal to read out vibrato modulation waveform data representing sampling values corresponding to each phase of the vibrato modulation effect, and supply this to the musical tone generator 4 as a modulation control signal DvI11.

In the above configuration, when the electronic musical instrument 1 is in a playing state as a whole, the modulation signal phase data generation circuit 12 of the modulation effect control circuit 11 generates the modulation signal phase data D□8 (FIG. 3(A)). This is then supplied to the modulation signal generation circuit 14 as correction phase data (D□C) J via the correction processing circuit 13A. At this time, the modulation control signal Dv□ read out from the modulation signal generation circuit 14 is controlled to change the pitch of the musical tone generated in the musical tone generator 4 at the period of the modulation signal phase data DPHN. A vibrato modulation effect can be added to the generated musical tone.

This operation of the modulation effect control circuit 11 is performed by using the modulation signal phase data generation circuit 12 in common for all the sound generation channels, that is, the musical tones of the third (J=1 to 8) sound generation channels. .

In addition to this, the modulation effect control circuit 11 detects the key-on pulse signal ( By supplying the modulated signal phase data DPKN from the modulated signal phase data generation circuit 12 at the relevant timing to the initial value memory 13C via the selector 13B, the initial value data (DPH) is supplied to the selector 13B. ) J.

This operation is executed for each channel (J = channels 1 to 8), and thus the initial value data for 8 channels that can be produced simultaneously at maximum can be held in the initial value memory 13C, and this initial value data (DPH ) J to generate the key-on pulse signal (KONP) J until the key-on signal (KON) changes when the key is released, the initial value data (Dr) I) J is used to set the initial value. The data correction circuit 13 uses phase data for modulation signal Dr)I.
Perform a correction calculation on N. From this, the modulation control signal I)v+s of the third sound generation channel is obtained.

For example, at time t in FIG. 3(B), a key-on pulse signal (KONP) is generated for the third sound generation channel.
, when the value of the modulated signal phase data D PHN is φ, (Fig. 3 (A)), this phase φ
, is held in the initial value memory 13C as initial value data (DPH) J, and thereafter this initial value data (DrH) J
Accordingly, the modulation signal phase data DPIIN is subjected to the calculation of the above-mentioned equation (2) in the correction processing circuit 13A.

As a result of this correction processing calculation, a key-on pulse signal (KO
NP) When J occurs 1. In the correction processing circuit 13
The phase value of the modulation signal phase data DPHH supplied to A is φ, (rsd), whereas the initial value memory 13C
Since the value of the initial value data stored in is also φa (rad), the value of the corrected phase data (DrHc) J is OCr
= sd ).

In this way, the calculation of the correction processing circuit 13A is such that the phase value of the modulation control signal Dv+1 is O(rad) when the key-on pulse signal (KONP) of the third sound generation channel is generated.
) (that is, the O-phase state Li), this means implementing a process that starts the reading operation of the vibrato modulation waveform data of the modulation signal generation circuit I4. As a result, the vibrato modulation effect applied to the musical tone assigned to the fifth tone generation channel when the tone starts to be generated starts from a state in which the pitch change is always 0 phase.

This operation applies to all sound generation channels, that is, J=
This is performed for channels 1 to 8, respectively, and as a result, for all sound generation channels, the amount of vibrato modulation applied at the timing when the musical tone assigned to the channel starts sounding is changed to the amount of vibrato modulation that does not apply a vibrato effect (that is, the amount of vibrato modulation of the O phase). This means that it can be started from state B).

According to the above configuration, the phase of the vibrato effect to be applied to each of a plurality of musical tones that can be generated simultaneously is set to a state B where all musical tones have a 0 phase (i.e., no vibrato modulation effect is applied) for all musical tones at the start of sound generation. Li), it is possible to prevent an unnatural vibrato effect from occurring in the overall synthesized musical tones generated in the sound system 5 when a key is pressed for each musical tone.

[2] Other embodiments (1) In the above embodiment, the initial value memory 13C
We have described a case in which initial value data is stored circularly using an 8-stage shift register, but instead of this, an R
A M (random access memory)
), the initial value data is stored by accessing the address of the memory area assigned to the third sounding channel at the timing of the key-on pulse signal (KONP) J generated in the fifth sounding channel. It's okay.

(2) In the above embodiment, the initial value data correction circuit 13 uses phase data DPHN for the modulation signal at the timing when the key-on pulse signal (KONP) J is generated.
is directly recorded in the initial value memory 13C as initial value data, and then the correction processing circuit 13A subtracts the initial value data (DPN) J stored in the initial value memory 13C from the modulation signal phase data D□2. The case has been described in which the corrected phase data (D, , c) J is obtained by Even if the addition operation is performed in the circuit 13A, the same effect as in the above case can be obtained.

(3) In the above-mentioned embodiment, the present invention was described in which a vibrato effect is applied to a plurality of musical tones, but the present invention is not limited to this, and the present invention is not limited to this, but the present invention can also be applied to a tremolo modulation effect, a timbre modulation effect, an amplitude modulation effect, etc. It may also be applied to other modulation effects such as.

(4) In the above-described embodiment, the modulation signal generation circuit 14 which can impart one type of modulation effect (i.e. vibrato modulation effect) to musical tones of multiple channels is provided. The circuit 14 is not limited to this, but includes a plurality of modulation signal generating circuit sections capable of imparting a plurality of modulation effects, such as a vibrato modulation effect, a tremolo modulation effect, a timbre modulation effect, etc., for each sound generation channel. By selecting one of the plurality of modulation effects as necessary, it may be configured such that an arbitrary modulation effect can be applied to the musical tone of each sound generation channel as necessary.

(5) In the above embodiment, when generating a musical tone corresponding to a newly pressed key, the phase of the modulation effect is changed from the O phase state (that is, the state when no modulation effect occurs). Although the configuration is such that the sound generation starts, the phase of the modulation effect at the start of the sound generation is not limited to this, and a value other than 0 phase may be selected.

(6) In the embodiment shown in FIG. 1, a case has been described in which each component of the electronic musical instrument 1 is configured by dedicated hardware, but instead of this, phase data for modulation signal D P
Even if the signal processing from the generation of HN to the generation of the modulation control signal DV11, including the key press detection operation and the sound generation assignment operation, is entirely executed by software control using a microcomputer, etc. 491
(No. Publication), the same effect as in the above case can be obtained.

(7) In the above embodiment, the modulation effect control circuit 11
The present invention has been applied to the case where the electronic musical instrument is configured as a whole together with the keyboard circuit 2, the key press detection/sound generation assignment circuit 3, the musical tone generator 4, and the sound system 5. However, the present invention is not limited to this. The present invention may be applied to a device that does not have any components other than the effect control circuit 11, that is, a modulation effect device alone.

(8) In the above embodiment, corrected phase data (D□,) representing a phase value that changes into a sawtooth waveform shape.

In order to obtain the modulation control signal Dv++ that changes into a sine waveform shape, we have described the case where a memory for storing the modulation waveform data is used. Even if the shape modulation control signal DvB is obtained, the same effect as in the above case can be obtained.

Further, the modulation control signal Dv++a is not limited to a sine waveform, but may also use various waveforms such as a triangular waveform or a sawtooth waveform.

In some cases, the modulation signal generation circuit 14 may be omitted and the corrected phase data (DFHC) J may be directly used as the modulation control signal DV1.
It may be used as ml.

〔Effect of the invention〕

As described above, according to the present invention, in order to obtain a modulation control signal for controlling the modulation effect of a musical tone based on modulation signal phase data commonly used for a plurality of musical tones, modulation control at the start of generation of each musical tone is performed. By holding initial value data that aligns the signal phases and correcting the modulation signal phase data using this initial value data, the modulation effect phase of newly generated musical tones can be adjusted for all musical tones. As a result, it is possible to independently impart a modulation effect to each musical tone without giving any sense of discomfort as a whole.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the modulation effect device according to the present invention, FIG. 2 is a data configuration diagram showing the relationship between each time slot and initial phase data, and FIG. 3 is for explaining initial value data. It is a signal waveform diagram. 1...Electronic musical instrument, 2...Keyboard circuit, 3
...Key press detection/pronunciation assignment circuit, 4. Old musical tone generator, 5. Sound system, 11.
... Modulation effect control circuit, 12 ... Modulation signal phase data generation circuit, 13 ... Initial value data correction circuit, 14 ... Modulation signal generation circuit.

Claims (1)

[Scope of Claims] Phase data generation means that commonly generates phase data representing the phase of a modulation effect to be imparted to a plurality of musical tones for a plurality of musical tones; initial value memory means for storing initial value data corresponding to the phase data generated from the generating means so as to be readable for each of the plurality of musical tones; a correction processing means for sending corrected phase data corrected so that the phases of the modulation effects to be applied to the corresponding musical tones are aligned at the start of sound generation of each of the musical tones by correcting the phase data using the initial value data; A modulation effect device comprising: