JP2933210B2 - Electronic musical instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic musical instrument, and more particularly, to an electronic musical instrument capable of providing a musical effect such as vibrato corresponding to a tone color sequence.

[0002]

2. Description of the Related Art Conventionally, there has been known a technique in which a shift register and an adder are provided for each tone generation sequence, that is, for each tone generation channel, to thereby impart a vibrato effect to a tone (for example, Japanese Patent Publication No. 57-22399). This is because an adder updates the value by periodically moving the stored value of the shift register, thereby providing a vibrato effect.
The output of O (low frequency oscillator) is created.

[0003]

However, according to the above-mentioned prior art, the timing of applying vibrato is performed from the point in time when key depression is detected. That is,
The vibrato circuit has a 1: 1 correspondence with the sound channel.

On the other hand, in recent electronic musical instruments, a plurality of tone colors can be set, and some tone channels can be assigned to each tone color. Even with such an electronic musical instrument, when a musical effect such as vibrato is applied to a musical tone, it must be performed for each sounding channel.

However, if vibrato is applied separately to a sound group of the same timbre, there is a case where the phase of each musical sound is shifted and the like, so that it is hard to hear. Therefore, when vibrato is applied to the same tone group, all tones of the same tone are timed to accumulate and data is collected before the tone is generated, or data is extracted from the middle of the shift register and synthesized. Very difficult (or impossible) on hardware
There was a problem that there is.

Further, since a shift register is provided for each channel, there is a problem that the storage capacity is increased.

SUMMARY OF THE INVENTION In view of the above-mentioned problems in the conventional type, the present invention can provide a musical effect such as vibrato for each tone more naturally, and uses complex and large-capacity hardware. Not intended to provide electronic musical instruments.

[0008]

In order to achieve the above object, an electronic musical instrument according to the present invention provides, for a plurality of channels, timbre information for specifying a timbre assigned to each channel specified by channel information. Timbre information storage means for storing the same sound in different channels
Random access memory for storing the one that allows to assign colors, setting means for setting the waveform of the modulation information for each of the tone color information, a plurality of cumulative effect information for assigning musical effects to the musical tone Means for reading out tone color information corresponding to each channel from the tone color information storage means according to the channel information when forming a tone for each channel, and effect information at a predetermined address position based on the tone color information from the random access storage means. And read
Output means for outputting the modulation information of the waveform shape set by the setting means for the tone color information corresponding to each channel based on the read effect information; and musical tones to be emitted on each channel based on the modulation information. And an effect imparting means for imparting the same effect to different channels.
Identical on those channels when colors are assigned
Providing a musical effect using the cumulative effect information of
And the effect of the musical sound produced on those channels
It characterized Rukoto to match the phase.

The above-described cumulative effect information is, for example, information such as a series of LFO output data stored in a RAM (information conventionally stored in a shift register). The waveform shape of the modulation information is, for example, a sawtooth wave, a square wave, a triangular wave, or the like.

[0010]

According to such a configuration, the timbre information for specifying the timbre assigned to the tone generation channel is known, and the effect information at a predetermined address position based on the timbre information of the random access storage means is read out. On the basis of the modulation information output in the waveform shape set for the tone color information, a musical effect is given to the musical tone of the channel. Therefore, when the same timbre is assigned to another channel, the effect information can be read from the same address, so that a natural effect for each timbre is provided. Further, since the waveform shape of the modulation signal can be set for each tone, different modulation can be added to the tone for each tone.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of only an LFO-related portion of an electronic musical instrument according to an embodiment of the present invention. The electronic musical instrument is a polyphonic electronic musical instrument having 8 voices (8 tones) and 16 sounds (channels). 16 sounds can be assigned arbitrarily within 8 voices. For example, all 16 sounds may be used as one tone color, or 8 voices may be prepared for each of two channels.

In FIG. 1, 1 is LF for each voice.
This is a random access memory (RAM) 1 for storing an O waveform number LFO WAVE SELECT. The capacity is 2 bits / voice × 8 voices. The correspondence between the stored contents and the waveforms is as follows. (00) ₂ sawtooth waves (01) ₂ square waves (10) ₂ triangular waves (11) ₂ random numbers (XX) ₂ indicates a binary notation.

Reference numeral 2 denotes a RAM 2 for storing a voice number (tone color information) VOICE NUMBER assigned to each channel. Capacity is 3 bits / channel x 1
There are six channels. The voice number takes a value from "0" to "7". 3 is the degree of modulation (L
The RAM 3 stores the modulation LFO DEPTH that controls the FO depth. Capacity is 6 bits / channel x
There are 16 channels. This variable is “0” to “63”
Take the value of Reference numeral 4 denotes a RAM 4 for storing information LFO START indicating whether or not to apply LFO. The capacity is 1 bit / voice × 8 voices. This LFO START indicates that “0”: LFO is not applied “1”: LFO is applied.

Reference numeral 5 denotes information LFO SPE for determining the speed of LFO for each voice (the speed at which LFO is applied).
The RAM 5 stores the ED. Its capacity is 8 bits / voice × 8 voices. Speed information LFO SP
EED takes a value from "0" to "255". Reference numeral 6 denotes a RAM 6 having a storage area for eight words necessary for calculating the LFO of each voice. The storage area of 8 words is L
This is storage means for accumulating sequentially calculated values for FO output and outputting data at a predetermined address portion as effect information.

7 divides the mask clock 0 to "0"
Is a counter that counts “15” from “1”. The counter 7 is a 4-bit counter for designating a channel, and is synchronized with an address bus and a data bus. The 4-bit output of the counter 7 is input to the address terminals of the RAM2 and RAM3. The output of the lower 3 bits of the counter 7 is input to the address terminals of the RAM1, RAM4 and RAM5. Here, only the lower three bits of the counter are input to RAM1, RAM4, and RAM5 because the data stored in these RAMs is data for each voice, and is equivalent to 8 stages (8 voices) per voice.
It is only necessary to have access to

A chip select signal CS is input to the RAM1 to RAM5 via an address bus. Actually, the signal on the address bus is decoded to generate the chip select signal CS. The RAM1 to RAM5 are connected to the data bus and the terminal D1 for writing parameter data from the outside.

Write signal terminals WR of RAM1 to RAM5
Receives a write signal. Write signal "0,1 /
"4" indicates the timing at which the write signal is input.

In the electronic musical instrument of this embodiment, as shown in FIG.
5 ", and the lowest signal C of this counter is counted.
0 is further divided into four times as many clocks as the finest clock CL of the electronic musical instrument. The notation "0, 1/4" indicates that the write signal is input at the 0th and 1st timings in a section obtained by further dividing the pulse section of the lowest signal C0 of the counter into four equal parts.

The output terminal D0 of the RAM is input to a predetermined circuit.

8 is a carry signal generating circuit for generating a carry signal of the full adder 9, 9 is a full adder, 10 is a random number generating circuit, 11 is a selection circuit, 12 is a selector, 13 is a latch, 14 is a waveform forming logic, and 15 is a latch. , 16 are integrators and 17 is a selector. RAM6, latch 1
The loop constituted by 3, the full adder 9, and the selection circuit 11 plays the same role as the shift register in the conventional LFO.

The selector 12 selects and outputs a read / write address of the RAM 6. RA terminal of the selector 12
The voice number information is input from M2, and the lower three bits C2 to C0 of the counter are input to the B terminal. The selector 12 outputs the voice number input to the A terminal as an address to the RAM 6 at the first and second timings of the clock CL. Also, at the 0th and 3rd timings of the clock CL, the counter value of the terminal B is output to the RAM 6 as an address.

The output data of the RAM 6 is latched by the latch 13. The latch timing is 0th of the clock CL.
Timing. This latch data is full adder 9
To the B terminal. The terminals A of the full adder 9 are all "0", and the carry signal of the carry signal generation circuit 8 is input to the carry terminal C1. Carry signal generation circuit 8 generates a carry signal at a timing corresponding to the speed of the LFO output from RAM 5,
As a result, the value input to the full adder terminal B is incremented and output.

The output of the full adder 9 is input to the terminal B of the selection circuit 11. The selection circuit 11 includes an LFO from the RAM 4
And a signal indicating whether or not to apply LFO waveform selection information (LFO WAVE S) from the output terminal of RAM1.
ELECT) is input. If you do not apply LFO,
The selection circuit 11 does not output. When applying the LFO, the terminal A is selected based on the LFO waveform selection information of the RAM1.
And the full adder output of terminal B is selected and output. In addition, a new random number is output at the timing of carry generation of the carry signal generation circuit.

The output of the selection circuit 11 is input to the RAM 6,
Data is taken into the RAM 6 at the third timing of the clock CL. That is, data is output from the RAM 6 at the 0th timing of the clock CL, and the data is looped again and the data whose value is increased at the 3rd timing of the clock CL is taken in. In this way, it plays a role similar to that of the conventional LFO shift register.

On the other hand, at the first and second timings of the clock CL, the voice number is output from the selector 12, and the data having the voice number as the address is output from the RAM 6. This output data is input to the waveform forming logic 14. The waveform forming logic 14 is a circuit that forms a triangular wave or a square wave based on the output of the LFO loop (the output of the RAM 6), which is a simple sawtooth wave. The selection of these waveforms depends on the LFO waveform selection information output from the RAM 1. The output of the waveform forming logic 14 is latched at a stable timing (first timing of the clock CL). Further, the latch data and the RAM
3 is integrated with the LFO depth for each channel to obtain a final LFO output signal.

The selector 17 is a selector for selecting which of the voice number and the value of the counter from "0" to "7" is the address to be given to the RAM 1 in accordance with the timing of the system. That is, at the 0th and 3rd timings of the clock CL, the lower 3 bits of the counter are used as an address to the RAM1, and at other timings, the voice number output from the RAM2 is output as the address of the RAM1.

As described above, the first and second clocks CL
At the timing, processing based on the voice number is performed and output is performed. At other timings, that is, at the 0th and 3rd timings, automatic loop processing is performed.

FIG. 2 is a timing chart of main terminals in the block diagram of FIG. C0 to C3 indicate signals at the output terminals of the counter 7. Lowest signal C
The timing chart of the SA terminal and the like of the other selectors 12 is shown in an enlarged length of the sixth and seventh cycles of 0. The SA terminal of the selector 12 is a timing at which the A input of the selector 12, that is, the voice number is selected. This indicates that the contents of the RAM 6 are read out at the first and second timings according to the voice numbers. At the 0th and 3rd timings, the contents of the RAM 6 are automatically read regardless of the voice number according to the constant value of the counter.

SEL2 SA is a timing at which the A input of the selector 17, that is, the lower 3 bits of the counter is selected. As a result, at the 0th and 3rd timings, the LFO waveform selection signal corresponding to the coefficient of the counter is stored in the RAM.
It can be seen that the signal is output from No. 1. At the first and second timings, an output from the RAM 2, that is, an LFO waveform selection signal corresponding to the voice number is supplied to the waveform forming logic 14.

L1 is the output waveform of the latch 13. The latch 13 latches at the 0th timing, but has a delay of Δt in order to guarantee the operation. L2 indicates an output signal of the latch 15. The latch 15 latches at the first timing. Since the timing of the output from the RAM 6 is also the first timing, a delay of Δt is taken to guarantee the operation. LFO RAM W
R is a write permission signal to the RAM 6. At the third timing, since the calculation result that has passed through the LFO loop must have been already obtained at the output terminal of the selection circuit 11, writing is performed at that timing.

FIG. 3 is a schematic block diagram of an FM tone generator circuit incorporating the circuit of FIG. In this figure, 31 is a register group, 32 is a phase generator, 33 is a low-frequency oscillator, 3
4 is a touch envelope generator, 35 is an envelope generator, 36 is an adder, 37 is a frequency modulation operator, and 38 is an adder. The circuit of FIG. 1 corresponds to the low-frequency oscillator 33 and a part of the register group 31 of FIG. In the sound source circuit of FIG. 3, for example, the F number output from the phase generator 32 is added to the output of the low frequency oscillator 33, and vibrato is applied in such a manner that the frequency is modulated. However, the signal from the operator of the FM sound source may be amplitude-modulated by the LFO.

FIG. 4 is a detailed circuit diagram of the waveform forming logic 14 in FIG. 41 is a decoder part, 42 is LF
This signal line is turned on when the lower bit 61 of the O waveform selection information is (1) ₂ and the upper bit 62 is (0) ₂ . When the waveform selection information of the LFO is (01) ₂ , (1) ₂ is applied to the line 42, which is input to the input terminals of the nine AND circuits 53 via the NAND circuit 47. As a result, all lower bits become (0) ₂ and only the most significant bit is output. As a result, a square wave is output.

[0034] Since the waveform selecting information for the LFO (00) is ₂ or (11) any of the lines 42 to 46 when the ₂ (0) _2, the AND circuit 49 outputs (0) _2, the inverter 50 And its output (1) ₂
Is input to the AND circuit group 52. As a result, the input is output as it is, and a sawtooth wave or a random number is output.

When the LFO waveform selection information is (10) ₂ , the line 46 becomes (1) ₂ , and the initial rising portion of the sawtooth wave is output as it is. When the value increases and the output of the inverter 57 becomes (01) ₂ , since the line 44 becomes (1) ₂ , the AND circuit and the OR circuit 48 output (1) ₂ and the exclusive OR 51 outputs (1) _{2. 2} ) Enter. This inverts the input signal and decreases the output for increasing input values. In this way, the sawtooth wave is inverted and turned to output a triangular wave.

[0036]

As described above, according to the present invention, since the RAM is used as the LFO storage device instead of the conventional shift register, effect information such as LFO data can be extracted at any timing. Becomes
Therefore, effects such as vibrato corresponding to a tone color series can be realized with a simple configuration. Further, since the waveform shape of the modulation signal can be set for each tone, different modulations can be added to the tone for each tone, and various tone controls can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram of a relevant portion of an LFO according to an embodiment of the present invention.

FIG. 2 is a main timing chart of the circuit of FIG. 1;

FIG. 3 is a block diagram of an FM tone generator circuit incorporating the LFO of FIG. 1;

FIG. 4 is a diagram showing a specific circuit example of the waveform forming logic of FIG. 1;

[Explanation of symbols]

1-6 RAM, 7 counter, 8 carry signal generation circuit, 9 full adder, 10 random number generation circuit, 11 selection circuit, 12, 17 selector, 13, 15 latch,
14: waveform forming logic, 16: integrator.

Claims (1)

(57) [Claims] About 1. A plurality of channels, tone color information storage means der for storing tone color information specifying a tone color assigned to each channel specified by the channel information
To assign the same tone to different channels.
As to enable a random access storage means for storing a setting means for setting a waveform of the modulation information for each of the tone color information, a plurality of cumulative effect information for assigning musical effects to the musical tone, each channel When forming a tone, the tone color information corresponding to each channel is read from the tone color information storage means in accordance with the channel information, and the effect information at a predetermined address position based on the tone color information is read from the random access storage means, Output means for outputting, based on the read effect information, modulation information of the waveform shape set by the setting means for the tone color information corresponding to each channel, musical tones produced on each channel based on the modulation information ; and a effect imparting means for imparting effects, different Ji
When the same tone is assigned to a channel,
Music using the same cumulative effect information
Effect on those channels
Electronic musical instrument according to claim Rukoto to match the phase of the effect of musical tone sounds.