JPH0152759B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a musical tone generator,
More specifically, the present invention relates to a so-called waveform memory read type musical tone generation device which generates musical tones by reading musical waveforms stored in a waveform memory in advance.

(Prior Art) As a conventional musical tone generating device using a waveform memory read method, there is an invention disclosed in Japanese Patent Publication No. 33842/1983, for example. That is, a waveform memory storing a desired musical sound waveform (sound source waveform) is read out using a read address signal corresponding to the pitch of the musical sound to be generated (pitch of the pressed key), and this read musical sound waveform is used as a musical sound signal. It generates musical sounds.

(Problems to be Solved by the Invention) As is well known, the sounds of natural musical instruments have slightly different tones depending on their pitches (or ranges). However, in the conventional musical tone generation device using the waveform memory read method described above, once the shape of the musical waveform to be stored in the waveform memory is determined, the generated musical tone (musical tone signal) is fixed to a tone corresponding to this set waveform. Since the timbre cannot be easily changed, it is difficult to generate musical tones with different timbres for each pitch (range) as with natural musical instruments. In order to generate musical tones with different tones for each pitch (range), it is necessary to
It is necessary to provide a waveform memory that stores different tone waveforms for each musical tone, and the system becomes enormous.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to easily generate musical tones with different tones for each pitch (or range) without complicating the configuration in a waveform memory reading type musical tone generating device. It is.

(Means for Solving the Problems) In order to solve the above problems and achieve the purpose of the present invention, the present invention is characterized by a pitch specifying means for specifying the pitch of a musical tone to be generated, and a pitch specifying means for specifying the pitch of a musical tone to be generated, and first and second waveform storage means storing first and second waveform signals relating to different waveforms, respectively; and the first and second waveforms corresponding to the pitch designated by the pitch designation means. From the storage means, the first and second
a readout means for reading out a waveform signal of the pitch, and a note scaling parameter signal having a value corresponding to a pitch or a range stored in advance, and a note scaling parameter signal having a value corresponding to a pitch or a range, and a note scaling parameter signal having a value corresponding to a pitch or range, and a note scaling parameter signal having a value corresponding to a pitch or range, and a note scaling parameter signal having a value corresponding to a pitch or range, and a note scaling parameter signal having a value corresponding to a pitch or a range, and a note scaling parameter signal having a value corresponding to a pitch or a range, and a note scaling parameter signal having a value corresponding to a pitch or a range, and a note scaling parameter signal having a value corresponding to a pitch or a range. a note scaling parameter memory that outputs the note scaling parameter signal corresponding to the range in which the high pitch belongs; and a note scaling parameter memory that mixes the read out first waveform signal and second waveform signal based on the output note scaling parameter signal. A waveform in which the mixing ratio of the first waveform signal decreases and the mixing ratio of the second waveform signal increases as the pitch specified by the pitch specifying means or the range to which the pitch belongs increases. The present invention is comprised of a waveform memory read type musical tone generation device using the mixing means for outputting the signal.

(Operation of the Invention) In the present invention configured as described above, when the pitch of a musical tone to be generated is specified by the pitch specifying means, the reading means stores the pitch in the first and second waveform storage means. At the same time, the first and second waveform signals corresponding to the specified pitch are read out respectively, and at the same time, the note scaling parameter memory is stored in advance and the note scaling parameter memory is stored in advance to read out the first and second waveform signals corresponding to the specified pitch or the range to which the pitch belongs. The mixing means outputs a waveform signal obtained by mixing the read first and second waveform signals based on the note scaling parameter signal. In this mixing, the mixing ratio of the first waveform signal decreases and the mixing ratio of the second waveform signal increases as the specified pitch or the range to which the pitch belongs increases. 1st and 2nd
Since the waveform signals of the two waveform signals are mixed, the waveform of the musical tone generated based on the output waveform signal of the mixing means changes from that corresponding to the first waveform signal to the second waveform signal as the pitch or range increases. It gradually changes to the corresponding one.

(Effects of the Invention) As described in the above description of the operation, according to the present invention, the waveform of the generated musical tone increases as the pitch specified by the pitch specifying means or the range to which the pitch belongs increases. Since it gradually changes from one corresponding to the first waveform signal to one corresponding to the second waveform signal, the first waveform signal stored in the first waveform storage means imitates the waveform of the low range of a natural musical instrument. If the second waveform signal stored in the second waveform storage means imitates the waveform of the high range of the natural musical instrument, then To better imitate musical tones of natural musical instruments whose waveforms change with a simple configuration without using many waveform storage means.

Further, as a result of mixing the first and second waveform signals from the first and second waveform storage means in the mixing means based on the note scaling parameter signal stored in the note scaling parameter memory, the desired The musical sound waveforms of the bass and treble ranges of a desired musical instrument can be stored as they are in the first and second waveform storage means, and a waveform signal faithful to the desired musical instrument sound can be obtained from the mixing means. At the same time, by changing the change characteristics of the note scaling parameter signal stored in the note scaling parameter memory, it becomes possible to obtain a waveform signal with characteristics that change in various ways depending on the pitch.

(Example) An example of the present invention will be described with reference to the drawings.
In FIG. 1, a keyboard circuit 1 which is a pitch specifying means
Each output line of
on the other hand, and the input side of the note scaling parameter memory 9 on the other hand. In addition, keyboard circuit 1
is a key-on signal indicating that a key has been pressed
It is configured to output KON, and its output terminal is connected to the input side of the envelope waveform generator 11.

The output side of the frequency information memory 2 is connected to the input side of an accumulator 3, and a clock pulse φ is input to an accumulation command terminal of the accumulator 3. The frequency information memory 2 and the accumulator 3 constitute a reading means.

The output side of the accumulator 3 is connected to the input side of waveform memories 4 and 5, respectively, which are waveform storage means.
The output side of the waveform memory 4 is connected to a first input terminal A of a multiplier 6, and the output side of the multiplier 6 is connected to a first input terminal A of an adder 8. The output side of the waveform memory 5 is connected to a first input terminal A of a multiplier 7 , and the output side of the multiplier 7 is connected to a second input terminal B of an adder 8 .

These multipliers 6, 7 and adder 8 constitute a combining means.

The output side of the note scaling parameter memory 9 mentioned above is connected on the one hand to the second direct multiplier 6.
and, on the other hand, to a second input terminal B of the multiplier 7 via an all-bit inverter 10. Note scaling parameter memory 9 and all bit inverter 10 constitute parameter generating means.

The output side of the adder 8 is connected to the first input terminal A of the multiplier 12, and the output side of the envelope waveform generator 11 is connected to the second input terminal B of the multiplier 12. The output side of the multiplier 12 is connected to the input side of a digital-to-analog converter (hereinafter abbreviated as "D/A converter") 13, and the output side of the D/A converter 13 is connected to a sound system consisting of an amplifier, speakers, etc. 14 input side.

Here, when a key on the keyboard of the electronic musical instrument is pressed, the keyboard circuit 1 outputs a key-on signal KON and also outputs a logical value "1" to one output line corresponding to the pressed key. It is composed of
Further, the frequency information memory 2 stores frequency information F (constant) having a value corresponding to the pitch of each key.

Note scaling parameter memory 9 contains
For example, a note scaling parameter signal NSP having a value corresponding to the pitch of each key as shown in FIG. 2 is stored. Furthermore, the waveform memory 4 stores a waveform signal related to a waveform W1 containing many harmonic components as shown in FIG. 3A, for example.
For example, a waveform signal related to a waveform W2 having few harmonic components as shown in FIG. 3B is stored. Further, the envelope waveform generator 11 is configured to output a predetermined envelope waveform signal EV in response to a key-on signal KON indicating that a certain key has been pressed.

The operation of the musical tone generator having the above configuration will now be described.

When a certain key is pressed on the keyboard section, a key-on signal KON is output from the keyboard circuit 1, and a logic value "1" is output to one output line of the keyboard circuit 1 corresponding to the pressed key. Therefore, frequency information F having a value corresponding to the pitch of the pressed key (the pitch of the musical sound to be generated) is read out from the frequency information memory 2,
Furthermore, a note scaling parameter signal NSP corresponding to the pitch of the pressed key (the pitch of the musical tone to be generated) is read out from the note scaling parameter memory 9. The frequency information F read from the frequency information memory 2 is sequentially accumulated by the accumulator 3 at the timing of the clock pulse φ, and the accumulated value qF (q=
1, 2, 3...) are input to the waveform memories 4 and 5 as address signals. Here, accumulator 3 is the accumulated value
If qF reaches its maximum cumulative value (modulo),
It is configured to repeatedly accumulate frequency information F from the beginning.

The waveform memory 4 receives the accumulated value qF and outputs the waveform signal W.
1 is read out, and this waveform signal W1 is input to the first
It is input to input terminal A of . Similarly, the waveform memory 5 receives the accumulated value qF and reads out the waveform signal W2, and this waveform signal W2 is input to the first input terminal A of the multiplier 7. Further, since the note scaling parameter signal NSP read from the note scaling parameter memory 9 is inputted to the input terminal B of the multiplier 6 on the one hand, the multiplier 6 combines the waveform signal W1 and the note scaling parameter signal
A waveform signal W1/NSP multiplied by NSP is output.

In addition, note scaling parameter memory 9
Note scaling parameter signal NSP read from all bit inverter 1 on the other hand
After being inverted by 0, the inverted note scaling parameter signal is input to the second input terminal B of the multiplier 7. Here, the all-bit inverter 10 has a function of inverting and outputting each bit of the note scaling parameter signal NSP composed of an input digital signal. For example, when a 6-bit signal (101010) is input as the note scaling parameter signal NSP, a signal (010101) with each bit inverted is output. Therefore, the multiplier 7 receives the waveform signal W2 output from the waveform memory 5.
and the inverted note scaling parameter signal to output a waveform signal W2.

Waveform signal W1・NSP output from multiplier 6
and the waveform signal W2 output from the multiplier 7.
are added together in adder 8, resulting in adder 8
outputs the waveform signal (W1・NSP+W2+) as a musical tone signal.

This musical tone signal (W1・NSP+W2+) is input to the first input terminal A of the multiplier 12, where the key-on signal KON output from the keyboard circuit 1
In response, the envelope waveform signal EV output from the envelope waveform generator 11 is multiplied by the envelope waveform signal EV. In this way, the musical tone signal (W1・NSP+W
2+) is given an appropriate envelope, this musical tone signal is converted from a digital signal to an analog signal by the D/A converter 13,
The sound system 14 produces musical tones.

As described above, according to this embodiment, when a low-pitched key (for example, the key of pitch C2 shown in FIG. ₂ ) is pressed on the keyboard section, a note scaling parameter signal NSP of a large value is read out. Therefore,
The inverted note scaling parameter signal becomes a signal with a small value. As a result, the musical tone signal (W1・NSP+W2+) output from the adder 8
Since the synthesis ratio of the waveform signal W1 increases,
It contains more components of the waveform signal W1 than components of the waveform signal W2, and the resulting musical tone is the same as the waveform signal W2.
The tone will be close to 1.

In addition, when a high-pitched key (for example, the key of pitch C ₆ shown in Fig. 2) is pressed on the keyboard, a small value note scaling parameter signal NSP is pressed.
is read out. Therefore, the inverted note scaling parameter signal becomes a signal with a large value.
As a result, the musical tone signal (W
1・NSP+W2+) contains more components of the waveform signal W2 than components of the waveform signal W1 because the synthesis ratio of the waveform signal W2 becomes larger.
The resulting musical tone has a timbre close to that of the waveform signal W2.
As mentioned above, when a key in the low range is pressed, a tone corresponding to the waveform W1 in FIG. 3A is obtained, and when a key in the high range is pressed, a tone corresponding to the waveform W1 in FIG.
Since a tone corresponding to the waveform W2 is obtained, it can be said that the waveform W1 is a low-pitched waveform corresponding to the low-pitched tone, and the waveform W2 is a high-pitched waveform corresponding to the high-pitched tone.

Therefore, according to this embodiment, the two series of waveform signals W1 and W2 read out from the waveform memories 4 and 5
The waveform changes in response to changes in the note scaling parameter signal NSP because the musical tone signal is synthesized at a synthesis rate according to the value of the note scaling parameter signal NSP, which changes in response to the pitch of the pressed key. A musical tone signal is obtained, which makes it possible to generate a musical tone whose timbre changes depending on the pitch, like a natural musical instrument.

Note that in the above explanation, two waveform memories are used to synthesize two series of waveform signals, but the present invention is not limited to this, and the same effect can be achieved even in the case of three or more series. It will be implemented soon.

In addition, note scaling parameter memory 9
When the note scaling parameter signal NSP read from the waveform signal W1 is directly multiplied as it is, and when the note scaling parameter signal
Although the case has been described in which the waveform signal W2 is multiplied by the note scaling parameter signal obtained by inverting all bits of the NSP, the present invention is not limited to this. For example, you can invert only some bits of the note scaling parameter signal NSP, or invert the note scaling parameter signal NSP.
Appropriate parameters may be added or subtracted from NSP.

Furthermore, note scaling parameter memory 9
Although an example has been described in which note scaling parameter signals NSP with different values for each pitch are stored, the present invention is not limited to this. For example, note scaling parameter signals with different values for each pitch are stored. The NSP may be stored.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a waveform diagram showing an example of a note scaling parameter signal stored in the note scaling parameter memory, and FIGS. FIG. 2 is a waveform diagram showing an example of waveforms stored in a waveform memory in the embodiment shown in FIG. 1; 1...Keyboard circuit, 2...Frequency information memory, 3
... Accumulator, 4, 5 ... Waveform memory, 6, 7, 1
2... Multiplier, 8... Adder, 9... Note scaling parameter memory, 10... All bit inverter, 13... D/A converter, 11...
Envelope waveform generator, 14...sound system.

Claims (1)

[Scope of Claims] 1. Pitch specifying means for specifying the pitch of a musical tone to be generated, and first and second waveforms having mutually different tones.
first and second waveform storage means each storing a waveform signal of a readout means for reading out a waveform signal of the pitch, and a note scaling parameter signal having a value corresponding to a pitch or range stored in advance, and a note scaling parameter signal having a value corresponding to a pitch or range, and a note scaling parameter signal having a value corresponding to the pitch or range, and in response to pitch designation by the pitch designation means, the designated pitch or the note thereof. a note scaling parameter memory that outputs the note scaling parameter signal corresponding to the range in which the high pitch belongs; and a note scaling parameter memory that mixes the read out first waveform signal and second waveform signal based on the output note scaling parameter signal. A waveform in which the mixing ratio of the first waveform signal decreases and the mixing ratio of the second waveform signal increases as the pitch specified by the pitch specifying means or the range to which the pitch belongs increases. 1. A musical tone generating device of a waveform memory reading type, comprising a mixing means for outputting a signal, and generating a musical tone based on a waveform signal from the mixing means.