JPS61188591A - 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 [Technical Field of the Invention] The present invention relates to an electronic musical instrument capable of generating musical tones with a vibrato effect.

□ Ugly [Prior art], ・.

Conventionally, when generating vibrato in an analog music synthesizer, the output voltage of a modulation wheel is subtracted from the output voltage of a low frequency oscillator, and the resulting output is applied to a voltage controlled oscillator.

[Conventional technology point]

In the case of the above-mentioned conventional technology, since the vibrato depth is directly controlled by the output voltage of the modulation wheel,
The output accuracy of the modivision wheel has sometimes been a problem when performing sophisticated performances.

[Purpose of the invention]

To provide an electronic musical instrument capable of generating a vibrato effect suitable for more advanced performances by completely improving the output accuracy of a modulation wheel.

[Key points of the invention]

A key code setting means, a vibrato speed information setting means, a modulation wheel, a sensitivity information setting means for the modulation wheel, a vibrato waveform type information setting means, vibrato speed information given for each specific cycle, accumulated, and vibrato direction data and vibrato period. a vibrato counter that outputs information; a converter that converts the vibrato period information into vibrato waveform data according to the type of vibrato waveform; and a converter that multiplies the vibrato waveform data by the output of the modulation wheel and the output of the sensitivity information setting means, respectively. An electronic device comprising an arithmetic means for dividing and further adding or subtracting the key code to the resulting data according to the content of the vibrato direction data, and a musical tone generating means for generating a musical tone based on the arithmetic result of the arithmetic means. It's a musical instrument.

〔Example〕

Hereinafter, an example of the present invention will be described with reference to the drawings.

The first wi is a system configuration diagram of the electronic musical instrument according to this embodiment. In the figure, 1 is a keyboard equipped with a plurality of keys, and 2'' is a switch section equipped with various switches such as a tone setting switch, a vibrato speed setting switch, a vibrato waveform type setting switch, etc.Then, the keys and switches are The respective outputs are both given to the control section '3 and processed.

Furthermore, 4 is a modulation wheel, the output of which is subjected to modulation D conversion by an A/D converter 5 and is applied to the control section 3. The modulation wheel 4 is used to determine biprate depth information, and its sensitivity is controlled by the output of the sensitivity setting section 6 being supplied to the control section 3.

The control section 3 is comprised of a CPU (central processing unit), etc., and periodically applies scan signals to the keyboard 1 and the switch input section 2 to check whether each key or switch is on or off. Then, a control signal for musical tone creation is generated according to the state, the output of the A/D converter 5, and the output of the sensitivity setting section 6, and is applied to the musical tone generating section 7. This musical sound generation section 7
is DOO(D1'gital Qontrolle+
A musical tone signal is generated and supplied to the D/A converter 8, where it is converted into an analog musical tone signal and emitted from the speaker lO. It should be noted that this musical tone generation circuit may generate the 7-tone tone, or one musical tone generation circuit may be provided to generate the 7-tone tone by time-division processing. This analog musical tone signal is emitted as a musical tone via an amplifier 9 and a speaker 1O.

FIG. 2 shows a specific configuration of the pipetate waveform generation circuit of the control section 3^. In the figure, a vibrato counter 11 is supplied with vibrato speed information stored in a register 13 via an adder 12 at every specific period (for example, 8.192 m#ao), and accumulates the information. The conclusion is that the most significant bit S of the vibrato counter 11 outputs vibrato direction data, and the other bits output vibrato period information, and this η
``The Prato period information is supplied to the vibrato waveform converter 14.The vibrato direction data is supplied to the comparator 15 and compared with the previous one, and if there is a discrepancy, a reset signal is given to the vibrato counter 11 to reset it. In the drum, the vibrato direction data is data indicating whether the frequency is modulated higher or lower than the center frequency.

The vibrato waveform converter 14 converts the vibrato period information into a vibrato waveform according to the vibrato waveform type information set in the register 16, and supplies it to the multiplier (or divider) 17. Sensitivity information from the sensitivity setting section 6 is applied via the register 18 and multiplied (or divided) by the vibrato waveform.
Then, the resulting data is set in the register 19 and supplied to the multiplier 20.

The multiplier 20 is also supplied with the output value of the modulation wheel 4 via the register 21, multiplies it with the resultant data, sets the resultant data in the register 22, and supplies it to the adder/subtractor 23.

A key code is also supplied to this adder/subtractor 23 from a register 24, and the vibrato direction data is applied as an addition command (when it is 0'') or a subtraction command (when it is '1'').

Therefore, the adder/subtractor 23 adds or subtracts the result data to the key code, outputs a new key code, and sets it in the register 25. This new key code is then sent to DOO in the musical tone generating section γ, and a vibrato musical tone signal is generated.

On the drum, 3rd rI! J indicates the data format of the frequency information such as the key code. This key code is expressed by a total of 16 pits of data, and the upper lO bits are pitches 00 to 0? The lower 6 bits represent the frequency information of less than the semitone.
Figure 5 shows four types of vibrato waveforms in this embodiment.
'RIANGL]il), SFware (8QUARI
).

In this example, the vibrato speed is 20~
The vibrato depth, that is, the sensitivity information is operable in the range of 1 to 300 (in hexadecimal notation).

The output value of the modulation wheel 4 is θ ~ 1.0
changes up to. When the vibrato depth is 1, no vibrato is applied, and when it is 2, it is approximately ±1.611 C cents) at its maximum modulation, which is the shallowest vibrato, and when it is 300, it is approximately ±1 oct at its maximum modulation. (octave).

Also, the vibrato calculation cycle is 8.192m5eo.

Assuming that, the vibrato period is 18.8! lul
! , varies within the range of .

Next, the operation of the above embodiment will be explained with reference to the sixth rlil. Incidentally, this FIG. 6 explains the operation of the vibrato waveform generation circuit shown in FIG. 2 in order.

That is, the OPU of the control unit 3 operates when a key on the keyboard L is operated and its output is given, and when the vibrato speed, vibrato depth, and vibrato waveform type are set by each setting switch and the respective information is given. ,8.192m5
An operation command is given to the vibrato waveform generation circuit at a period of eo. Therefore, the vibrato counter 11 is given vibrato speed information and accumulates it, and outputs the resulting data as vibrato direction data and vibrato period information, the vibrato period information is given to the vibrato waveform converter 114, and the vibrato direction data is The signal is supplied to the comparison section 15. This vibrato direction data is then judged by the comparing section 15 as to whether or not the content is different from the previous one. If it is different, the vibrato counter 11 is reset; on the other hand, if it is not different, the vibrato counter 11 is not reset. .

When the vibrato waveform type information set in the register 16 is 5AWUP, the vibrato waveform converter 14 outputs the upper 8 bits of the vibrato period information as a vibrato waveform and supplies it to the multiplier 17. Incidentally, in order to improve the accuracy, all the bits (15 bits) of the vibrato period information may be output as a vibrato waveform (the same applies to the following examples).

When the vibrato waveform type information is SAW DOWN and the vibrato direction data is @θ'', the vibrato waveform converting section 14 takes the one's complement of the vibrato period information (i.e. all “'1” data). The upper 8 bits of the resulting data are output as a vibrato waveform.On the other hand, if the direction data is @l'', the upper 8 bits of the vibrato period information are output as a vibrato waveform. Output as a waveform.

Further, when the vibrato waveform type information is 5QUAR]ii, when the vibrato direction data is 0'', 8 bits, all ``OI'' data is set and output as a vibrato waveform, and on the other hand, when the vibrato direction data is ``1'', 8 bits , all″
'l'' data is set and output as a vibrato waveform.

``Furthermore, when the vibrato waveform type information is 'I'RIANGLE,' when the MSB (most significant bit) of the vibrato period information is 0'', data obtained by doubling the vibrato period information is output as a vibrato waveform; When the MSB is "l'", the current vibrato period information is subtracted from the maximum possible value of the vibrato period information, and the subtraction result is doubled and output as a vibrato waveform.

The vibrato waveform data is then multiplied by the sensitivity information from the register 18 in the multiplier 17, and the resulting data is set in the register 19 and given to the multiplier 20. In this case, as already mentioned, the sensitivity information ranges from 1 to 300 (hexadecimal expression) depending on the setting state of the sensitivity setting section 6.
As shown in FIG. 6, the upper 16 pits of the multiplication result data of the multiplier 17 are set in the register 19.

Next, this multiplication result data is multiplied by the output value (data in the range of 0 to 1.0) of the modulation wheel 4 set in the register 21 in the multiplier 20.
The resulting data is set in the register 22. The sensitivity information multiplied by the output value of the modulation wheel 4 represents the actual vibrato depth information, and the resultant data set in the register 22 represents the amount of change that produces the vibrato effect. .

This amount of change is further processed in register 2 in adder/subtractor set 3.
It is added (when the vibrato direction data is 0'') or subtracted (when the vibrato direction data is '1'') to the key code set to 4, and as a result, a new key code with ° modulation is created. obtained and sent to the DCO. Therefore, a musical tone with a vibrato effect is created and emitted from the speaker 10.

〔Effect of the invention〕

As explained above, the present invention provides sensitivity information setting means that separately provides sensitivity information for the output value of the modulation wheel, so the output accuracy of the modulation wheel is greatly improved compared to the conventional method. This has the advantage of making it possible to perform sophisticated performances that can generate extremely subtle vibrato. □

[Brief explanation of drawings]

Fig. 1 is a system configuration diagram of an electronic musical instrument according to an embodiment of the present invention, and Fig. 2 is a circuit diagram of a vibrato waveform generation circuit.
31W is a diagram showing the data format of frequency information, No. AF! li is a diagram showing a scale code, FIG. 5 is a diagram showing a tetrapod vibrato waveform, and FIG. 6 is a diagram showing the operation of vibrato waveform calculation. 1...Keyboard, 2...Switch input section,
3... Control m, 4... Modulation wheel, 5... A/D converter, 6...
... Sensitivity setting section, 7... Musical sound generation section, 8...
...D/A converter, 9...Amplifier, 10...
... Speaker, 11 ... Vibrato counter, 12 ... Adder, 13.16.18.19
．． 21.22.24.25...Register, 14
...Piprato waveform converter, 17.20...
... Multiplier, 23... Addition/subtraction device. Patent applicant: Casio Computer Co., Ltd.
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Claims (2)

[Claims] (1) a key code setting means, a vibrato speed information setting means, a modulation wheel for setting vibrato depth information, a sensitivity information setting means for setting sensitivity information of the modulation wheel, and a vibrato waveform type information setting means; a vibrato counter that receives and accumulates vibrato speed information provided by the vibrato speed information setting means every specific period and outputs vibrato direction data and vibrato period information; and a vibrato counter that outputs vibrato direction data and vibrato period information; a conversion means for converting into vibrato waveform data according to the type set by the information setting means;
The vibrato waveform data output from the conversion means is multiplied or divided by the output of the modulation wheel and the output of the sensitivity information setting means, respectively, and the key code is applied to the resulting data according to the contents of the vibrato direction data. An electronic musical instrument characterized by comprising: a calculation means for adding or subtracting a key code by the setting means; and a musical tone generation means for generating a musical tone based on the calculation result of the calculation means. (2) The electronic musical instrument according to claim 1, wherein the vibrato counter is reset if the contents of the vibrato direction data do not match the previous contents.