JPS61105596A - Musical sound generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a musical tone generator, and more specifically to a so-called waveform memory readout device that generates musical tones by reading musical waveforms stored in a waveform memory in advance. The present invention relates to a musical tone generating device of this type.

(Prior art) As a conventional musical tone generator using a waveform memory read method,
For example, there is an invention disclosed in Japanese Patent Publication No. 50-33842. In other words, the pitch of the musical tone to be generated (the pitch of the pressed key) in the waveform memory that stores the desired musical sound waveform (sound source waveform)
A musical tone is generated using the readout address signal corresponding to the musical tone signal as a musical tone signal.

(Problem to be solved by the invention) By the way, as is well known, the sound of a natural instrument depends on its pitch (
The tones differ slightly depending on the pitch (or range). However, in the above-mentioned conventional waveform memory reading type musical tone generation device, once the shape of the musical waveform to be stored in the waveform memory is determined, the generated musical tone (musical tone signal)
Since the tone color is fixed to correspond to this set waveform and the tone color cannot be easily changed, it is difficult to generate musical tones with different tone colors for each pitch (range) like a natural musical instrument. In order to generate musical tones with different timbres for each pitch (range), it is necessary to provide a waveform memory that stores different musical sound waveforms for each pitch (range), which would result in a huge system. I don't get it.

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 and Their Effects) In the present invention, the waveform storage means stores waveform signals relating to a plurality of mutually different waveforms, and the waveform signals corresponding to the pitch designated by the pitch designation means are stored in the waveform storage means. Each of the above waveform signals is read out from the waveform storage means by the reading means. On the other hand, the parameter generation means generates a parameter signal having a value corresponding to the pitch specified by the sweat height designation means (or the range to which the pitch belongs), and the above-mentioned waveform signals are synthesized by the synthesis means. A musical tone is generated based on the output of this synthesis means by synthesizing at a synthesis ratio corresponding to the value.

(Example) An embodiment of the invention will be described with reference to the drawings.

In FIG. 1, each output line of the keyboard circuit l, which is pitch specifying means, is connected to the input side of the frequency information memory 2 on one side, and to the input side of the note scaling parameter memory 9 on the other side. ing. Also,! 11 circuit 1 is configured to output a key-on signal KON indicating that a certain key has been pressed, and its output terminal is connected to the input side of envelope waveform generator 11.

The output side of the frequency information memory 2 is connected to the input side of the accumulator 3, and the accumulation command terminal of the accumulator 3 is connected to the 0 frequency/number information memory 2 to which the clock pulse φ is input. The calculator 3 constitutes a reading means.

The outputs of the accumulators 3 are each connected to the inputs of waveform memories 4.5, 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 described above is connected on the one hand directly to the second input terminal B of the multiplier 6 and on the other hand to the second input terminal B of the multiplier 7 via an all-bit inverter IO. has been done. The note scaling parameter memory 9 and the all-pit inverter 10 constitute parameter generation 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 12 is a digital-to-analog converter (
The output side of the D/A converter 13 is connected to the input side of a sound system 14 including an amplifier, speakers, etc.

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 key-on signal KON.
It is configured to output a logical value "l" to one output line corresponding to the pressed key.

Further, the frequency information memory 2 stores frequency information F (constant) having a value corresponding to the pitch of each key.

The note scaling parameter memory 9 contains, for example, 8
A note scaling parameter signal NSP having a value corresponding to the pitch of each key as shown in FIG. 2 is stored. Further, the waveform memory 4 stores a waveform signal related to the waveform W1 including many harmonic components as shown in FIG. A waveform signal related to waveform W2 with few components 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 corresponding to the pressed key of the keyboard circuit 1. 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 from the frequency information memory 2, and furthermore, 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 note scaling parameter memory 9. The frequency information F read out from the zero frequency information memory 2 is sequentially accumulated by the accumulator 3 at the timing of the glock pulse φ, and the accumulated value qF (q=1.2.3・
) are input to the waveform memories 4 and 5 as address signals. Here, the accumulator 3 is configured to repeatedly accumulate the frequency information F from the beginning when the accumulated value qF reaches its maximum accumulated value (modulo).

The waveform memory 4 receives the accumulated value qF and reads out the waveform signal W1, and this waveform signal W1 is input to the first input terminal A of the multiplier 6. Similarly, the waveform memory 5 receives the accumulated value qF and reads out the upper branch signal W2, and this waveform signal W2 is input to the first input terminal A of the multiplier 7. Further, 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, so that the 1 multiplier 6 receives the waveform signal W1.
A waveform signal W1.NSP is output by multiplying by the note scaling parameter signal NSP.

Further, the note scaling parameter signal NSF read from the note scaling parameter memory 9 is inverted by the all-bit inverter IO on the other hand, and then the inverted note scaling parameter signal rKτ is input to the second input terminal B of the multiplier 7. Ru. Here, the all-pit inverter 10 has a function of inverting and outputting each bit of the note scaling parameter signal NSP composed of an input digital signal.
When a 6-bit signal (101010) is input, a signal (010101) with each bit inverted is output.

Therefore, the 1 multiplier 7 combines the waveform signal W2 output from the waveform memory 5 with the inverted note scaling parameter signal NSP.
and outputs the waveform signal W2.NSP.

The waveform signal W1/NSP output from the multiplier 6 and the waveform signal W2/box output from the multiplier 7 are added together in the adder 8, and as a result, the adder 8 adds the waveform signal (wi/N
SP+W2・N5P) is output as a musical tone signal.

This musical tone signal (Wl.NSP+W2.N5P) is input to the first input terminal A of the multiplier 12, where the m-board circuit 1
The key-on signal KON outputted from the envelope waveform generator 11 is multiplied by the envelope waveform signal EV outputted from the envelope waveform generator 11. In this way, the musical tone signal (W
1-NSP+W2/Wl1) is given an appropriate volume 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, in the keyboard section, the bass f
When f1 (for example, the key of pitch 02 shown in the wSZ diagram) is pressed, a large value note scaling parameter signal NSP is read out. Therefore, the inverted note scaling parameter signal NSP becomes a signal with a small value. As a result, the musical tone signal (Wl・NS
Since the synthesis ratio of the waveform signal Wl increases, the resulting musical tone contains more components of the waveform signal W1 than the components of the waveform signal W2.
The tone is close to l.

Further, when a high tone source (for example, a key of pitch 06 shown in FIG. 2) is pressed on the keyboard section, a small value note scaling parameter signal NSP is read out. Therefore, the inverted note scaling parameter signal NSP becomes a signal with a large value.

As a result, the musical tone signal (Wt・N
SP+W2・N5P), since the synthesis ratio of waveform signal W2 becomes larger, the waveform signal W2 is larger than the waveform signal W1 component.
The resulting musical tone has a timbre close to that of the waveform signal W2.

Therefore, according to this embodiment, the waveform signals Wl and W2 of the second system 11 read from the waveform memories 4 and 5 are converted to the value of the note scaling parameter signal NSF that changes in accordance with the pitch of the inserted key. The note scaling parameter signal NS is
A musical tone signal whose waveform changes in response to changes in P is obtained,
With this C, it is possible to generate musical tones 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 obtained even in the case of three or more series. It will be implemented.

In addition, there is a case where the note scaling parameter signal NSP read from the note scaling parameter memory 9 is directly multiplied by the waveform signal W1, and a case where the note scaling parameter signal m obtained by inverting all bits of the note scaling parameter signal NSP is multiplied by the waveform signal W2. Although the case has been described, the present invention is not limited to this. For example, only some bits of the note scaling parameter signal NSF may be inverted, or appropriate parameters may be added or subtracted from the note scaling parameter signal NSP.

Furthermore, although an example has been described in which note scaling parameter memory 9 stores note scaling parameter signals NSP with different values for each pitch, the present invention is not limited to this. Note scaling parameter signal NS with different values
P may be stored.

(Effects of the Invention) According to the present invention, the synthesis ratio of a plurality of series of waveform signals read from the waveform storage means is controlled using a parameter signal that changes depending on the pitch or range of the musical sound to be generated. Since it forms signals, it is possible to generate musical tone signals with different waveform shapes for each pitch or range with a simple configuration, so it is possible to generate musical tones with different timbres for each pitch or range like a natural musical instrument. I can do it.

[Brief explanation of the drawing]

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, Fig. 3 (A), CB) 2A and 2B are waveform diagrams showing examples of waveforms stored in the waveform memory in the embodiment shown in FIG. 1, respectively. l... Keyboard circuit 2... Frequency information memory 3... Accumulator 4.5... Waveform memory 6.7
．． 12... Multiplier 8... Adder 9... Note scaling parameter memory lO... All pit inverter 13... D/A converter 11... Envelope waveform generator 14... Sound system

Claims (1)

[Scope of Claims] Pitch specifying means for specifying the pitch of a musical tone to be generated; waveform storage means for storing waveform signals regarding a plurality of mutually different waveforms; and a pitch specified by the pitch specifying means. reading means for reading each of the above waveform signals from the waveform storage means in response to the above; and generating a parameter signal having a value corresponding to the pitch specified by the pitch specifying means or the range to which the pitch belongs. and a synthesizing means for synthesizing each of the waveform signals at a synthesis ratio corresponding to the value of the parameter signal, the musical tone generator generating musical tones based on the output of the synthesizing means. Device.