JPS5840193B2 - electronic musical instruments - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic musical instrument, and more particularly to an improvement of a multi-keyboard type electronic musical instrument equipped with a manual keyboard and a pedal keyboard.

Considering the effect of the performance sound in this kind of electronic musical instrument,
It is effective to provide a sound source for the manual keyboard and a sound source for the pedal keyboard separately so that when they are sounded simultaneously, a so-called multi-sequence effect can be produced, since it can enrich the expression of the performance sound.

However, in doing so, it is necessary to prevent a difference in pitch between the sounds played from the manual keyboard and the sounds played from the pedal keyboard.

On the other hand, it is common practice to add a vibrato effect to the performance sound as a means of enriching the expression of the performance sound, but from the point of view of the performance effect, even if vibrato is applied to the manual keyboard, vibrato is not applied to the pedal keyboard at the same time. It is advisable not to make it stick.

The present invention aims to provide an electronic musical instrument that can meet the above requirements all at once with a relatively simple configuration.

An example of the present invention will be described below in detail with reference to the drawings.The basic structure of the electronic musical instrument of the present invention, as shown in FIG. 1, includes an oscillator 1 for a pedal keyboard sound source and an oscillator 2 for a manual keyboard sound source.

In this embodiment, the pedal keyboard sound source oscillator 1 is constituted by a square wave oscillator, and its square wave output is sent out as the pedal keyboard sound source signal PK.

In accordance with this, the manual keyboard sound source oscillator 2 has a voltage-controlled continuous oscillator configuration, and is configured to send out an oscillation output whose frequency changes in response to the magnitude of the voltage control input as the manual keyboard sound source signal MK. There is.

However, the manual keyboard sound source oscillator 2 is controlled based on the output signal PK of the pedal keyboard sound source oscillator 1, so that the frequency of the output signal MK responds to the frequency of the output signal PK.

That is, the output signal PK of the pedal keyboard sound source oscillator 1 is applied to the n-ary counter 3, and the count signal PC representing the count contents is applied to the comparator circuit 4 as one comparison input.

On the other hand, the carry signal CAR of the n-ary counter 3 is given as an open control signal to the output gate 5 provided in the output path of the comparison circuit 4, and also to the counter 6 which receives the output signal MK of the manual keyboard sound source oscillator 2. Given as a reset signal.

Counter 6 counts the number of pulses of output signal MK of oscillator 2 after arrival of reset signal CAR, and supplies count signal MC representing the count to comparator circuit 4 as the other comparison input.

In this way, the comparator circuit 4 compares the instantaneous count contents of the counters 3 and 6 and outputs a comparison output CO whose content is the difference.
M is given to the output gate 5.

This comparison output COM is given to a D/A converter 7 having a low-pass waveform configuration through a gate 5 which is opened when the next carry signal CAR is generated in the n-ary counter 3.
This converts it into a DC level voltage output DCC and gives it to the manual keyboard tone generator oscillator 2 as a voltage control signal.

Note that 8 is a comparison output signal forming circuit consisting of a system of the comparison circuit 4, the gate 5, and the D/A converter 7.

In the above configuration, when the oscillation frequency of the pedal keyboard sound source oscillator 1 and the oscillation frequency of the manual keyboard sound source oscillator 2 are equal, the first carry signal CA of the n-ary counter 3
Since the count contents of the counter 6 from the generation of R until the carry signal CAR of the method is generated are equal to the count contents of the counter 3, the next carry signal CA
Comparison output C sent out from gate 5 opened by R
The content of OM is "0", and the output of converter 7 is also at "0" level.

Therefore, the output of the oscillator 2 is not changed in any way and therefore remains in the above-mentioned state as a whole.

If the frequency of the output of the oscillator 1 becomes higher (or lower) than the frequency of the output of the oscillator 2 from this state, the content of the comparison output COM of the comparison circuit 4 changes in the "positive" (or "negative") direction. Accordingly, the oscillator 2 is controlled in such a direction that its output frequency increases (or decreases), and thus the output frequency of the oscillator 2 is controlled to always match the output frequency of the oscillator 1.

As described above, by controlling the manual keyboard sound source oscillator 2 based on the output signal PK of the pedal keyboard sound source oscillator 1, the frequency of the manual keyboard sound source signal MK is made to follow the frequency of the pedal keyboard sound source signal PK. By doing so, it is possible to prevent a difference in pitch between the performance sound from the manual keyboard and the performance sound from the pedal keyboard.

Note that the comparison output signal forming circuit 8 in FIG. 1 may have the structure shown in FIG. 2.

In this case, the count outputs PC and MC of counters 3 and 6
are applied to the subtraction circuit 11 as an addition input and a subtraction input, and the difference output of the subtraction circuit 11 is applied to the latch circuit 13 through the gate 12.

The gate 12 is opened by the carry signal CAR of the counter 3, and the subtraction output at this time is stored in the latch circuit 13, and this subtraction is performed from the time when the first carry signal CAR is applied until the next carry signal CAR is applied. The storage state of the output in the latch circuit 13 is held.

The stored contents of this latch circuit 13 are given to the oscillator 2 as a control voltage DCC via a D/A converter 14.

With the configuration shown in FIG. 2, as in the case of FIG. 1, it is possible to obtain a voltage output corresponding to the frequency difference between the outputs of oscillators 1 and 2, and thus the frequency difference can be made zero.

Another example of the comparison output signal forming circuit 8 is shown in FIG.

In this case, the count output of counters 3 and 6 is the subtraction circuit 2.
1 as an addition input and a subtraction input, and the difference output thereof is provided to a gate 23 via a D/A converter 22.

However, the carry signal CA of the counter 3 is sent to the gate 23.
R is applied as an open control signal, and upon arrival of the carry signal CAR, the difference output of the subtraction circuit 21 is sampled and held in the sample and hold circuit 24 through the gate 23.

In this way, the oscillators 1 and 2 in FIG. 1 can be operated so that the output frequency is O, as in the case described above.

Next, the electronic musical instrument of the present invention (first Q invention) is based on the configuration shown in FIG. 1, and is equipped with a vibrato adding circuit as shown in FIG. 4 in order to increase the vibrato effect only for the manual keyboard sound source signal MK.

In other words, as shown by assigning the same reference numerals to parts corresponding to those in FIG.
a sound source oscillator) 1, an n-ary counter (first counting circuit) 3 that counts the output frequency signal of the oscillator 1, and an addition data forming circuit (pitch control data generation circuit) 33 that generates pitch control data. an addition circuit (calculation circuit) 31 that calculates the counting output data of the n-ary counter 3 and pitch control data of the addition data forming circuit 33; a manual keyboard sound source oscillator (second sound source oscillator) 2; A counter (second counting circuit) 6 that counts the output frequency signal of the above-mentioned adding circuit 31 is compared with the count output data of the above-mentioned counter 6, and the comparison output is sent to the above-mentioned manual keyboard tone generator oscillator 2. The comparison output signal forming circuit 8 is provided to send out an oscillation frequency control signal.

To explain in more detail, in this electronic musical instrument, the n-ary counter 3
A digital addition circuit 31 is inserted in the path of the count output pc to the comparison circuit, and an addition data forming circuit 33 is added based on the output of the vibrato oscillator 32 as an addition input.
The addition data SD formed in is given.

The vibrato oscillator 32 is composed of a square wave oscillator having an oscillation frequency higher than the vibrato frequency, and when the vibrato switch 34 provided in the addition data forming circuit 33 as shown in FIG. The bit counter 35 is used to count.

The 7-bit count outputs v1 to v7 excluding the most significant bit (MSB) of the counter 35 are given as one input to exclusive OR circuits 36 provided respectively, and each output of the OR circuits 36 is applied to the corresponding bit of the 7-bit first demultiplexer 39A, and
5 excluding the highest bit and lower 2 bits of counter 35
The output of the bit-wise exclusive OR circuit 36 is applied to the corresponding bit of the 5-bit second demultiplexer 39B.

The first and second demultiplexers 39A and 39B are supplied with bigler depth control signals B1 and vB2.

The signals vB1 and vB2 are composed of 3-bit digital signals A-C sent from OR gate circuit groups 38A and 38B connected to each output contact of the vibrato depth selection switch 37, as shown in FIG.

However, the first and second demultiplexers 39A and 3
Each bit circuit of 9B has an input terminal ■ and four output terminals T.
, ~T4, and when a logic "1" input arrives at the input terminal ■, as shown in FIG. It is made to be.

The outputs A, ~A7 and B1-B5 thus obtained at the outputs of the first and second demultiplexers 39 and 39B, respectively, are applied as two addition inputs to the digital adder 40, and thus the addition output terminal S , ~S7, as shown in FIG. 8, the addition data signal SD of a triangular waveform is sent out, in which the count content of the counter 35 increases and decreases as time passes.

When the most significant bit (MSB) of the counter 35 is "O", the addition data signal SD increases as the contents of the outputs v1 to V7 increase, and when the most significant bit is "1", the exclusive OR circuit 36 outputs the complement, so the outputs v1 to v
As the content of 7 increases, the summed data signal SD decreases.

This triangular waveform addition data signal SD is added to the output PCK of the n-ary counter 3, whereby one input to the comparator circuit 4 is varied by this data signal SD.

However, at this time, as described above with reference to FIG. 1, the frequency of the oscillation output MK of the manual keyboard sound source oscillator 20 (therefore, the count contents of the counter 6) changes accordingly.

In this way, the manual keyboard sound source signal MK is subjected to vibrato at a frequency and depth corresponding to fluctuations in the triangular waveform addition data signal SD.

In this embodiment, the amplitude value and therefore the vibrato depth of the summed data signal SD is determined by the demultiplexers 39A and 39.
Contents of control signals VB1 and vB2 for B (
Therefore, it is selected by the selection position of the changeover switch 37).

For example, as shown in FIG. 6, the first demultiplexer 39A is controlled and used by the control signal vB1 at the switching position I8 at a depth of 8/8, thereby forming the addition data signal SD with an amplitude ratio of 8/8.

In this case, the output terminal T1 of the demultiplexer 39A
(Fig. 7), so the outputs A1 to A
An addition data signal SD having a content of 7 is sent out from the adder 40.

Further, control signals VB1 and -B2 are obtained at the switching position (6), and by controlling and using the first and second demultiplexers 39A and 39B, respectively, a summation data signal SD with an amplitude ratio of 6/8 is formed. .

In this case, the output T of the first demultiplexer 39A
2 and the output T3 of the second demultiplexer 39B are obtained, and therefore the adder 40 sends out the addition data signal SD containing the sum of the outputs A, .about.A7 and the outputs B1 to B6.

FIG. 9 shows an embodiment of the second invention.

In the case of FIG. 4, the output SD of the addition data forming circuit 33 is
The digital addition circuit 31 provided between the counter 3 and the comparison circuit 4 on the output side of the pedal keyboard sound source oscillator 1 adds to the output PC of the counter 3, but instead of this, the following configuration is used.

That is, this electronic musical instrument includes a pedal keyboard sound source oscillator (first sound source oscillator) 1, a pitch control data generating circuit that includes a vibrato program data forming circuit 49, a reference program data forming circuit 50, etc., and generates pitch control data. and a pulse that includes a programmable down counter 45, an inverter 46, a gate 47, an adder 51, a gate 52, etc., and changes the number of pulses per unit time in the output frequency signal of the pedal keyboard sound source oscillator 1 according to the pitch control data. a counter (first counting circuit) 3 that counts the output signal of this pulse number changing circuit, a manual keyboard sound source oscillator (second sound source oscillator) 2, and an output frequency signal of this oscillator 2. A counting counter (second counting circuit) 6 compares the count output data of the n-ary counter 3 with the count output data of the counter 6, and sends the comparison output to the manual keyboard sound source oscillator 2 to determine the oscillation frequency. The comparison output signal forming circuit 8 is provided to send out a control signal.

More specifically, in this electronic musical instrument, the output signal PK of the pedal keyboard sound source oscillator 1 is input to a programmable counter 4.
5, and its output pulse PM is supplied as an inhibit signal to an AND gate 47 inserted between the oscillator 1 and the n-ary counter 3 via an inverter 46.

The period of the output pulse PM of the programmer full counter 45 is controlled by the program signal PS, and as the value of the program signal PC increases (or decreases), the period increases (
or smaller), thus the oscillator 1 by the gate 47
Decrease (or increase) the number of inhibit pulses per unit time for the output pulse PK of.

Therefore, the counting speed of the n-ary counter 3 becomes faster (or slower), and therefore the number of times the carry signal CAR is outputted per unit time of the n-ary counter 3 increases (or decreases).

However, now, since the contents of the counters 3 and 60 counted between successive carry signals CAR match, the number of outputs of the carry signal CAR becomes large (or small).
In other words, if the output cycle of the carry signal CAR becomes shorter (or longer), the carry signal CA becomes shorter (or longer) from an instantaneous point of view.
Even though the count content of the n-ary counter 3 remains unchanged between R, the content of the counter 6 becomes smaller (or larger).

At this time, the output frequency of the manual keyboard sound source oscillator 2, and therefore the system of the counter 6, operates to match the contents of the counter 3 in the same manner as described above with reference to FIG. lower) changed.

Therefore, the configuration shown in FIG. 9 can also provide the same effect as described above with respect to FIG.

In the case of FIG. 9, the program signal PS for the programmable counter 45 is obtained based on the output of the vibrato program data forming circuit 49 operated by the output of the vibrato oscillator 32 and the output of the reference program data forming unit 50.

That is, these outputs are added in the adder 51, and the content when the output pulse PM of the programmer counter 45 is obtained among the sword oN data is expressed as this output pulse P.
It is applied to the counter 45 as a program signal PS via an AND gate 52 opened by M.

Here, as the vibrato program data forming circuit 49, the addition data forming circuit 33 described above with reference to FIG. 5 can be used as is.

In this embodiment, a reference program data forming circuit 50, which is provided together with the vibrato program data forming circuit 49, is provided to arbitrarily select the reference level as necessary to enhance the vibrato effect.

FIG. 10 shows an embodiment of the third invention.

In FIGS. 1 to 9, an electronic musical instrument realized using a digital circuit has been described, but it can also be realized using an analog circuit as shown in FIG. 10.

That is, this electronic musical instrument includes a pedal keyboard sound source oscillator (first sound source oscillator) 1 and a frequency-voltage converter (first frequency/voltage converter) that outputs a voltage signal corresponding to the frequency of the output frequency signal of this oscillator 1. a vibrato oscillator (pitch control signal generation circuit) 64 that generates a pitch control voltage signal, and the frequency-voltage converter 6
an adder (modulation circuit) 66 that modulates the output voltage signal of 1 by the pitch control voltage signal; an oscillator for manual keyboard sound source (second sound source oscillator) 2; a frequency-voltage converter (second frequency/voltage conversion circuit) 6 that outputs a voltage signal
3, and a differential amplifier that compares the output signal of the adder 66 and the output voltage signal of the frequency-voltage converter 63, and sends the comparison output to the manual keyboard sound source oscillator 2 as an oscillation frequency control signal. (comparison circuit) 62.

More specifically, in this electronic musical instrument, the sound source signal PK of the pedal keyboard sound source oscillator 1, similar to that shown in FIG. given to one input end.

On the other hand, the sound source signal MK of the manual keyboard sound source oscillator 2 similar to that shown in FIG. The differential output of the differential amplifier 62 is applied to the manual keyboard sound source oscillator 2 as a control voltage input DCC.

In this way, if the oscillation frequency of the oscillator 1 for the pedal keyboard sound source changes, the oscillation frequency of the oscillator 2 for the manual keyboard sound source will follow this and change so that the differential output DCC of the differential amplifier 62 becomes O. In this way, as in the case of FIG. 1, it is possible to obtain the effect that there is no difference in pitch between the sound played on the pedal keyboard and the sound played on the manual keyboard.

In the case of FIG. 10, in addition to this configuration, a vibrato oscillator 64 having a sine wave oscillator configuration is provided as a vibrato adding circuit (its oscillation frequency can be variably set by a variable resistor 65), and its output is sent to the pedal keyboard sound source signal PK side. The output of the frequency-voltage converter 61 is added via an adder 66.

In this way, one input of the differential amplifier 62 fluctuates depending on the output voltage of the vibrato oscillator 64, and at this time, the oscillation frequency of the manual keyboard sound source oscillator 2 changes in accordance with this fluctuation. Similarly, a vibrato effect can be added to the manual keyboard sound source signal MK.

According to the present invention (first to third invention) as described above,
By providing a sound source for each of the manual keyboard and pedal keyboard, it is possible to obtain a multi-sequence effect, and by synchronizing the musical tones of each series at the scheduled pitch, it is possible to prevent pitch deviations from occurring. can.

Furthermore, in the present invention, a sound source signal for a pedal sound without vibrato is created, and a vibrato modulation is added to this sound source signal for a pedal sound through subsequent processing to create a sound source signal for a manual sound. With a simple configuration without using instruments, vibrato can be applied only to the manual keyboard without impairing the above-mentioned effects, and without adding vibrato to the pedal keyboard.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing the basic configuration of an electronic musical instrument according to the present invention, FIGS. 2 and 3 are system diagrams showing other embodiments of the comparison output signal forming circuit of FIG. 1, and FIG. A system diagram showing an embodiment of the electronic musical instrument according to the invention, FIGS. 5 to 8 are connection diagrams, charts, and signal waveform diagrams for explaining the detailed configuration and operation thereof, and FIGS. 9 and 10 are diagrams of other inventions. FIG. 2 is a system diagram showing an example of FIG. 1... Oscillator for pedal keyboard sound source, 2... Pa...
Oscillator for manual keyboard sound source, 3, 6... - Counter, 4... Comparison circuit, 5... Output gate, ? , 14°22...D/A converter, 8.
...-Comparison output signal forming circuit, IL2'l...
...Subtraction circuit, 12,23゜47.52...Gate, 13...Latch circuit, 24...
Sample hold circuit, 31--digital addition circuit, 32, 64--vibrato oscillator, 33-
... Addition data forming circuit, 34 ... Vibrato switch, 45 ... Programmer full counter, 46 ... Inverter, 51 ...
Adder, 61°63... Frequency-voltage converter,
62...Differential amplifier.

Claims (1)

[Claims] 1. A first sound source oscillator for pedal sound, a first counting circuit that counts an output frequency signal of the first sound source oscillator,
a pitch control data generation circuit that generates pitch control data; an arithmetic circuit that calculates the counting output data of the first counting circuit and the pitch control data; and a second sound source oscillator for manual sound of variable frequency control type. and a second counting circuit that counts the output frequency signal of the second sound source oscillator, compares the calculation output data of the calculation circuit with the counting output data of the second counting circuit, and outputs the comparison output as described above. Second
a comparison circuit that sends an oscillation frequency control signal to the sound source oscillator, the output frequency signal of the first sound source oscillator is used as a sound source signal for the pedal sound, and the output frequency signal of the second sound source oscillator is used as the sound source signal for the manual sound. An electronic musical instrument characterized in that it is used as a sound source signal. 2. A first sound source oscillator for pedal sound, a pitch control data generation circuit that generates pitch control data, and changing the number of pulses per unit time in the output frequency signal of the first sound source oscillator according to the pitch control data. a pulse number changing circuit, a first counting circuit that counts the output signal of the pulse number changing circuit, a second sound source oscillator for manual sound of variable frequency control type, and an output frequency signal of the second sound source oscillator. A second counting circuit that counts the oscillation frequency compares the counting output data of the first counting circuit with the counting output data of the second counting circuit, and sends the comparison output to the second sound source oscillator to determine the oscillation frequency. a comparison circuit for sending out a control signal, the output frequency signal of the first sound source oscillator is used as a sound source signal for a pedal sound, and the output frequency signal of the second sound source oscillator is used as a sound source signal for a manual sound. An electronic musical instrument characterized by: 3. A first sound source oscillator for pedal sound, a first frequency/voltage conversion circuit that outputs a voltage signal corresponding to the frequency of the output frequency signal of the first sound source oscillator, and a first frequency/voltage conversion circuit that generates a pitch control voltage signal. a pitch control signal generation circuit, a modulation circuit that modulates the output voltage signal of the first frequency/voltage conversion circuit with the pitch control voltage signal, and a second sound source oscillator for manual sound of variable frequency control type; a second frequency/voltage conversion circuit that outputs a voltage signal corresponding to the frequency of the output frequency signal of the second sound source oscillator; an output signal of the modulation circuit; and an output voltage signal of the second frequency/voltage conversion circuit; and compare the comparison output with the second
a comparison circuit that sends an oscillation frequency control signal to the sound source oscillator, the output frequency signal of the first sound source oscillator is used as a sound source signal for the pedal sound, and the output frequency signal of the second sound source oscillator is used as the sound source signal for the manual sound. An electronic musical instrument characterized in that it is used as a sound source signal.