JPS6052897A - Sound source unit for electronic musical instrument - 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 The present invention relates to a sound source device for an electronic musical instrument that can generate a scale signal of an equal tempered scale.

[Prior art]

The frequency was divided using a frequency divider corresponding to the musical scale.

[Apex of conventional technology]

Ninth, using a divider corresponding to each non-average scale,
As the scale of the circuit within the electronic musical instrument becomes larger and the size of the electronic musical instrument becomes larger, a disadvantage arises in that the cost increases.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to generate a scale signal based on an adjacent scale with a simple circuit configuration.

[Key points of the invention]

Nine frequency information corresponding to a specified scale, for example, an Arabic scale, is stored in a readable/writable storage means, and the frequency number 1 stored in this storage means is 1. Main block diagram of an electronic musical instrument to which the present invention is applied. It is. 1 in the figure is a keyboard, and 2C in the figure, the equal-tempered scale (normal), the Arabic scale (arapic), and the Arabic scale are set appropriately (S'
The switch part 2 has a switch 2α for selecting various modes (F3T), a switch for selecting a tone, etc., and a keyboard 1
, the outputs of the switch section 2 are both input to a control section (central processing unit #) 3 that controls all operations of the electronic musical instrument. The control section 3 has a built-in frequency table 3a, as shown in FIG. 2, in which frequency numbers are stored in increments of 50 cents within one octave.

4 in the figure is a scale generator that creates nine frequencies corresponding to each pitch, and either the equal temperament ROM 5 stores frequency numbers corresponding to the equal temperament scale, or the frequency numbers corresponding to the Arabic scale. The output from the scale register 6 is sent to the gate circuit Gl.

It is input by controlling the opening and closing of G2. A switching signal from the control section 3 is input directly or via the inverter 7 to the gate circuits Gl and G2. The above-mentioned average value ROM 5 receives the signals t1 to tl11 outputted from the timing generator 8 and is addressed via the decoder 9, so that the above-mentioned scale generator 4 outputs W in equal temperament via the gate circuit G1. The frequency number that was entered is input. The signals 11 to tsz are outputted at the timing shown in FIG. This signal tl~t1 is an AND gate 10-1
~10-#12 are input to one end of each. Father, at the other end of this AND gate 10-1 to 10-12, there is a control section 3.
Signals t1' to tsw' are input thereto. The outputs of the AND gates 10-1 to 10-12 are directly input to gate circuits G3 and G4 via an OR gate 11 and an inverter 12, respectively. This gate circuit G3 is
When appropriately setting the Arabic scale, a frequency number to be played is inputted from the frequency table 3a using a signal obtained by operating the keyboard l. The gate circuit G4 shifts the 9 frequency numbers corresponding to the 12 note names of 1 octave stored in the scale register 6 using the clock OLK from the terminal OLK of the control section 3, and transfers them to the scale register 6 again. Party B controls whether input is allowed.

On the other hand, a signal K output from the control section 3 when the key is turned on or off is input to the scale generator 4. By this signal K, a scale frequency based on the friend note name specified by the switch 2α is input to the musical tone creation section 13, and along with fBl and a key code outputted from the control section 3, the nine frequencies corresponding to the pitch of the pressed key are input. A musical tone is created with the specified tone and is emitted via the amplifier 14 and speaker 15. From gate circuit G2,
Furthermore, a signal is input to the display section 16 as well. This display section 16 is composed of a liquid crystal, and the switch 2α is set to Arabic,
The scale is displayed based on the frequency number from the scale register 6 which is output when set to the 8hiT position.

Next, the operation of this embodiment will be explained.

It is composed of 49 keys ranging from -b (OOdP2) to the sixth octave (00 ko6). When the switch 2a is set to the normal position to perform a performance based on the equal temperament scale, the timing generator 8 outputs signals t1 to tow by inputting the clock OLK from the control section 3. . The signals tx to t12 are decoded by the decoder 9, and the frequency number of the note name of 12III corresponding to one octa of the equal temperament ROM 5 is outputted. Since the switching signal from the control unit 3 is outputting '1', the gate circuit G
1 is opened, and the frequency number of the equal temperament ROM 15 is input to the scale generator 4. When the key of fly board 1 is pressed, control I1
By pressing the key from 1 to 3, the value of the signal becomes l+11'' at the timing of the nentone name.

Therefore, the frequency corresponding to the note name is output from the scale generator 4 and input to the musical tone generator 13. This musical tone creation section 1
3 receives the cross-code signal from the control unit 3, and the signal from the scale generator a4 is divided into frequencies corresponding to the octave to create musical tones with the set timbre.
The sound is emitted through the 4% speaker 15.

Next, the switch 2a is set to the Arabic position, and a performance is performed based on the Arabic scale. Here, when the electronic musical instrument is powered on, the control section 3 sequentially outputs the signals tl' to tsw' to one ends of the AND gates 10-1 to 10-12. On the other hand, the signals 11 to t from the timing generator 8 are input to the computer games 10-1 to 10-12 and 4.

Therefore, the AND gates 10-1 to 10-12 handle the signal 1
1 to t12, and outputs a gate circuit opening/closing control signal to the gate circuit G3 via the OR gate. Father, the control unit 3 receives the signal t'w~t■ from the frequency table 3α.
In synchronization with the tying, frequency numbers are outputted and stored in the scale register 6, respectively.

Here, the frequency number fl is stored in the register F1 of the scale register 6, and the following registers F31 to F1m have frequency numbers fs, fm, fl, fl, fst,
fss %fts %fty, fl9, fat, fi
x will be memorized respectively. After that, the control unit 3 sends the signal t
lI to t111' are not output, gate circuit G3 is closed, gate circuit G4 is opened, and the value of scale register 6 is being shifted repeatedly.

The switching signal from the control unit 3 outputs IIO'', opens the gate circuit G2 via the inverter 7, and opens the gate circuit G1.
Close. Therefore, the same wave number numbers stored in the scale register 6 are sequentially input to the scale generator 4. The subsequent @JP\'' is the same as the operation based on the equal temperament scale.

Next, set the switch 2α to the SET position.

The operation of arbitrarily setting an Arabic scale by a performer will be explained. For the key ml, as shown in Figure 4, the lowest octave is the fourth octave (00f4) (00#5),
The next two octaves (UP) and one key are used for setting Arabic scales. Now, the Arabic scale is the 5th scale.
As shown in the figure, 0, D.

It is preset as E%F%G%A%B.

Here, if you change the note name 0 to 0, octave range d
Turn on the own key 0. Conversely, if you want to change the pitch name 0 to 0, turn on the octave range UP key 0.

First, the case of changing the pitch name 0 to 0'6 will be explained using the scale setting flow shown in FIG. The process starts at step S1 and proceeds to step 82.

In step 82, the key in the octave range UP, which is pressed when lowering the scale note by 50 cents, is pressed 75-N.
It is time to do 11. Now, since we are pressing the ``cone'' in the octave range of trown, we judge ``NO'' and step S.
Proceed to step 3. In step s3, contrary to step S2, it is determined whether or not the key of the octave dawn, which is pressed when lowering the scale note by 50 cents, is pressed. now,
Since I am pressing key 0 of this octave range down,
It is determined as "ygs" and the process proceeds to step 84. step s
4, it is determined that 0 is on, and the process proceeds to step S5. and,
1M-1' becomes '1'' from the control unit 3. When the signal t1 from the timing generator 8 is output, the AND gate 1
0-1 is open and the signal via 11 is input to the gate circuit G3, closes the gate circuit G4, and opens the gate circuit G3. Also, from the frequency table 3α,
Frequency number f! 4 appears and inputs it to the gate circuit G3 to make it false. Therefore, at the timing of the signal 11 of the timing generator 8, the frequency number f114 is input to the corresponding register F1 of the scale register 6 and stored. Then, after the signal i S I is reset to lO'', step s6
Proceed to.

Thereafter, when the C frame is turned on, the process proceeds to step s7, and in the same operation as described above, the signal i z I becomes 1, and the corresponding register F of the scale register 6! frequency number fa
is memorized. Similarly, in steps 88 and 89, the operation of Q is executed, and the process advances to step 81o to perform other controls.

Next, we will explain how to change the note name 0 to 0. When you turn on @O of octave range UP,
At step 4c, it is determined as "YB8@" and the process proceeds to step S11.

Then, it is determined that the rainbow is 'YB8''' and step 812
Proceed with g. In this step 812, the control unit 3 outputs a signal tt' from the tie-setting signal generator 8. 11 enters the gate circuit G3, opens the gate circuit G3, and opens the gate circuit G4.
Close. On the other hand, the frequency number f2 is output from the frequency table 3α and input to the gate circuit G3. Therefore, at the timing of the signal t1 of the timing generator 8, the frequency number f2 is input to the corresponding register pl of the scale register 6 and stored. Then, the signal tl' is '0
”, the process proceeds to step 813. From then on,
If the 0 slope is turned on, the process advances to step 814 and register F2 is turned on.
If the frequency number f4 is stored in and B is turned on, the process advances to step 816 via step 815 and the register l't
A frequency number fsn is stored in z.

The rightmost key on the keyboard 1 is in the clearing mode, which divides the Arabic scale set by the performer by S and sets it to the Arabic scale that is preset when the power is turned on. When this clear key is turned on, 'ygs@' is determined in step 817, and the process proceeds to step 818, where the same operation as when the frequency number is stored in the scale register 6 when the power is turned on is executed, and the Arabic scale shown in FIG. The frequency number corresponding to the frequency number is stored in the scale register 6 (00-J'5), so that you can actually play the Arabic scale stored in the scale register 6 and perform the sound by ear. used for. Therefore, while setting the Arabic scale, the performer can easily perform a performance based on the nine Arabic scales currently set and judge whether or not it suits the player's own preference.

Furthermore, when the switch 2α is set to the Arabic or 8FLT position, the output from the gate circuit G2 is output to the display unit 16, and an Arabic scale based on the frequency number of the currently set scale register is displayed. Therefore, the eyes
Since you can also check the details, setting the Arabic scale becomes much easier.

In this example, the Arabic scale is set by using a key of 2 octaves and moving up and down by 50 cents, but this is not limited to this. , you can set the Arabic scale in detail by using two octaves to raise or lower the pitch by 55 cents. (5) It goes without saying that the present invention can be similarly applied to non-tempered scales other than Arabic scales.

〔Effect of the invention〕

As explained above, a series of frequency information corresponding to a specified scale is written in the storage means, and the written frequency information is bridged to generate a scale tone signal of the scale, so a simple circuit can be used. It has the great advantage of being able to easily adapt to various musical scales.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the main≠lock of an electronic musical instrument to which the present invention is applied, Fig. 2 is a diagram showing frequency numbers obtained by dividing an octave into 50 cent units, and Fig. 3 is a diagram showing timing generation a8.
FIG. 4 is a time chart showing the timing of the signals t1 to t1 output from the keyboard, FIG. 4 is a functional division state diagram of the keyboard 1 according to the setting position of the switch 2a, and FIG. Figure 6 is a flowchart that operates when setting an Arabic scale. 1...keyboard, 3a...1 wave number table 4...scale generator, 5...well-tempered mouth OM6...scale register. Patent applicant Casio Computer Co., Ltd. M60 1pm Kuzu 5 Ru

Claims (1)

[Claims] rl) 17- writeable/writeable storage means, frequency information setting means for setting a series of frequency information in the storage means according to a designated scale, and frequency information setting means for setting a series of frequency information in the storage means; and means for controlling the frequency of the scale tone to be generated based on the frequency information, and generating the scale tone signal.
A sound source device for an electronic musical instrument, characterized by the following. (2) The electronic musical instrument as set forth in claim 1, wherein the frequency information setting means includes a storage means that permanently stores a series of frequency information corresponding to a scale to be set. sound source device. 13) The sound source of the electronic musical instrument according to claim 1 or 2, wherein the frequency information setting means sets a series of frequency information for an Arabic scale in the readable/writable storage means. Device.