JPS6145286A - 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 music/sound given a vibrato effect.

[Prior art and its problems]

Conventionally, electronic musical instruments have been put into practical use in which the depth and speed of vibrato can be input as digital values, but in order to obtain a wide range of vibrato effects, it is necessary to input data with large values, making the input operation cumbersome. There was a problem.

[Purpose of the invention]

The purpose of the present invention is to provide an electronic musical instrument capable of obtaining a wide range of vibrato effects with simple input operations.

[Key points of the invention]

[Embodiment] Hereinafter, this embodiment will be described with reference to the drawings. An embodiment of the invention will be described.

FIG. 1 is a system configuration diagram of an electronic musical instrument according to this embodiment. In the figure, 1 has a plurality of keys, and ft-key 11.2 includes a tone setting switch, a vibrato waveform type setting switch, etc.
This is a switch input section equipped with various switches. Also, 3 is the data input section, where the depth and speed of the vibrato can be changed from a single switch to manual input.

It will be done. The outputs of the keyboard 1, switch input section 2, and data input section 3 are all fed to a control section 4 for processing. The control unit 4 is composed of a CPU (central processing unit), and periodically applies scan signals to the keyboard 11, switch input unit 2, and data input unit 3, and turns on each switch and switch. , examines the off state.Then, a control signal for creating a musical tone according to the state is generated and applied to the music/sound generation section 5.This musical tone generation section 5 is a DCO (Digital
σControJJed 0aoiIJJator)
etc., a musical tone signal is generated and applied to the D/A converter 6, where it is converted into an analog musical tone signal. This analog musical tone signal is emitted as a musical tone through the amplifier 7 and the speaker 8t. Further, the display section 9 displays data input from the data input section 3.

FIG. 2 shows a specific configuration of the vibrato waveform generation circuit in the musical tone generation section 5. As shown in FIG. In the figure, a vibrato counter 11 is supplied with vibrato speed information from a register 13 via an adder 12t every specific period (for example, a192 msec) and accumulates it. As a result, vibrato direction data is output from the most significant bit S of the vibrato counter 11, and vibrato period information is output from each of the other bits, both of which are supplied to the vibrato waveform converter 14. The vibrato direction data is also supplied to the comparator 5 and compared with the previous data, and if they do not match, 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 supplied from the register 16 and supplies the vibrato waveform to a multiplier (t or divider) 17. The multiplier 17 [t:t also receives vibrato depth information from the register 18, multiplies (or divides) the vibrato waveform, sets the resulting data in the register 19, and supplies it to the adder/subtractor 20. .

A key code is also supplied to this adder/subtractor 20, and the vibrato direction data is an addition command ("0"
) or as a subtraction command (when "1"). Therefore, the adder/subtractor 20 adds or subtracts the result data to the key code, outputs a new key code, and sets it in the register 21. Therefore, this rough key code is the DCOK in the musical tone generating section 5.
A musical tone signal with vibrato is generated.

In the figure, 22 is a vibrato speed designation switch provided in the data input section 3, the output of which is input to a data expansion circuit 23 where it undergoes data expansion by exponential conversion, and is stored in the register 13 as vibrato speed information. Set. Furthermore, 24 is a vibrato waveform type setting switch, the output of which is set in the register 16 as vibrato waveform type information. Further, 25 is a vibrato depth designation switch provided in the data input section 3, the output of which is input to a data expansion circuit 26, subjected to data expansion by exponential conversion, and set in the register 18 as vibrato depth information. be done.

On the other hand, FIG. 3 shows the data format of the frequency information such as the key code. Therefore, this key code is 16 in total.
The upper 10 bits represent the scale code from pitch C0 to C1 (specific data is shown in Figure 4), and the lower 6 pits represent frequency information below a semitone. ΔPITCH.

Further, FIG. 5 shows four types of vibrato waveforms in this embodiment, and as shown in the figure, SAW, UP, SAW, DOWN
, TRIANGLE, and 5QUARE.

In this example, the vibrato speed is 20~
It is possible to operate in the range of 5sEQ (in hexadecimal notation) and the vibrato depth in the range of 1 to 500 (in hexadecimal notation). When the vibrato depth is 1, no vibrato is applied, and when it is 2, the maximum modulation is approximately ±
1.6 g (cents) and the shallowest vibrato, and when it is 300, the maximum modulation time is ±1
oct (octave).

Assuming that the matahibrato calculation cycle is a192msec, the vibrato cycle is 148sec to 25m5e.
It varies within a range of c.

Next, the operation of the data expansion circuits 23 and 26 will be explained with reference to FIGS. 6 to 9.

In FIG. 6, the vibrato speed or depth data input to the data expansion circuits 23 and 26 from the vibrato speed designation switch 23 or the vibrato depth designation switch 25, respectively, is 7 bits as shown in FIG. 6(1). is output as data. This 7-bit data becomes 10-bit data as shown in Figure 6 (2).
Each data expansion circuit 23, 26 performs index conversion.

FIG. 7 shows the operation of the data expansion circuit 23. Assuming that the input vibrato speed fK is 0 to 63□ in hexadecimal representation (0 to 99 in decimal representation). It is first incremented by +1, and then the resulting data is exponentially converted into 10-bit data, 1~29]',
, (1 to '71to). This data is then further multiplied by 32 to 2 for further calculations.
03. ~55EO,. The vibrato speed information is set in the register 13 as vibrato speed information in the range (32 to 214721Q1).

FIG. 8 explains the operation of the data decompression circuit 26.
The input vibrato depth value is 0 to 63. (D~99
□. ), the vibrato depth value is first incremented by +4, and then the resulting data is exponentially converted into 10-bit data.

As a result, the data is in the range ' 1 a' 2 F F 1. Then, for subsequent calculations, the data is -
3, 1-2FC,. The data range is set in the register 18 as vibrato depth information.

FIG. 9 shows the results of index conversion of data in the range of 0 to 67.6.

Next, the overall next operation will be explained with reference to FIG. Note that FIG. 10 is for explaining the operation of the vibrato waveform generation circuit shown in FIG. 2.

That is, the control unit 3 receives the output when the keys on the keyboard 1 are operated, and also controls the vibrato speed, vibrato depth,
When the vibrato waveform type is set to OFF by each switch 22, 25, 24 and the respective information is given to the registers 13, 18, 16, the tone generator 4 issues an operation command to obtain vibrato at a cycle of &192m5ec. give to Therefore, the vibrato counter 11 is given vibrato speed information, accumulates it, outputs the resulting data as vibrato direction data and vibrato period information, and supplies them to the vibrato waveform converter 4. The vibrato direction data is also supplied to the comparator 15, and a full judgment is made as to whether the contents are different from the previous data. If it is different, the vibrato counter 11 is reset;
If it is not different, the vibrato counter 11 will not be reset.

When the set vibrato waveform type a information is SAW UP, 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. In order to improve accuracy, all 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 Ω'', the vibrato waveform converter 14 converts the vibrato period information to 1.
(that is, take the exclusive OR with all "1" data), and output the upper 8 bits of the resulting data as a vibrato waveform. On the other hand, if the direction data is 1”
If so, the top 8 bits of the vibrato period information are output as a Q vibrato waveform.

Further, when the vibrato waveform type information is 5QUARE, when the vibrato direction data is 0', 8 bits, all ``0'' data is output as a vibrato waveform, and on the other hand, when the vibrato direction data is 1#, 8 bits, All g′1”
Output the data as a vibrato waveform.

Furthermore, when the vibrato waveform type information is TRIANGLE, when the MSB (most significant hit) of the vibrato period information is 0'', the data multiplied by the vibrato period information 't-2 is output as the vibrato waveform, and on the other hand, the When the MSB force is 11'', the current vibrato period information is subtracted from the maximum value that can be obtained from the vibrato period information;
Further, the result of the subtraction is doubled and output as a vibrato waveform.

The vibrato waveform data is further multiplied by the vibrato depth information by a multiplier 17, and the resulting data (amount of change) is further added (when the vibrato direction data is 0') or subtracted (when the vibrato direction data is 0') to the key code. When the vibrato direction data is '1'), a new modulated key code is obtained and sent to the DCO.

Therefore, a musical tone with a vibrato effect is created and emitted from the speaker 8. Note that a numeric keypad may be used for the vibrato speed designation switch 22 and the vibrato depth designation switch 25.

[Effects of the Invention] As explained above, the present invention allows vibrato speed information input from the vibrato speed information setting means and vibrato depth information input from the vibrato depth information setting means to be processed by the data decompression means. Since it is an electronic musical instrument that expands data and generates musical tones with a vibrato effect, it has the advantage of making it easy to obtain a wide range of vibrato effects (wide speed range, wide depth range) with simple input operations.

[Brief explanation of the drawing]

FIGS. 1 to 6 show one embodiment of the present invention.
The figure shows the system configuration of the electronic musical instrument on the same side, Figure 2 shows the configuration of the vibrato waveform generation circuit, Figure 3 shows the data format of frequency information, Figure 4 shows the scale code, and Figure 5 Figure 6 shows four types of vibrato waveforms.
7 is a diagram explaining the operation of the data expansion circuit 23, FIG. 8 is a diagram explaining the operation of the data expansion circuit 26, and FIG. 9 is a diagram illustrating the operation of the data expansion circuit 26. The figure @110 which shows the result of index conversion of the data in the range is a figure explaining the operation of the vibrato waveform generation circuit. l...Keyboard, 2...Switch input section,
3... Data input section, 4... Control section,
5... Musical sound generation unit, 6... D/A converter, 8... Speaker, 9... Display unit,
11...Vibrato counter, 12...
- Adder, t3. 16. 18;...19,21...
... Register, 14 ... Vibrato waveform converter, 15 ... Comparison section, 17 ... Multiplier (divider), 20 ... Addition and subtraction Vessel, 22...
...Vibrato speed designation switch, 23°26.
... Data expansion circuit, 24 ... Vibrato waveform type designation switch, 25 ... Vibrato depth designation switch 〇 Figure 1 Figure 2 Figure 4 Figure 5 (1) SAW tJP -5-os-14-
(1) (ri SAW DOWN Fig. 6 000 000000DEFG 011 0001DEFG11 100 001DEFG111 101 01DEFG1311 110 1DEFG11111 Fig. 7 (32＾214721゜) l”刹The harp No. 8 Figure 1-2 FC,. Figure 9 Figure 10 (1 (1υ5-1 (i) 5"O 5VIB, CoLINTER times Distance■Work■ possible ) Via ゝ) - To counterfeit D - f Surprising sign MSB Russia ((ii
)e Goalert Kakushi Yaomi MSB-1 Sankuni; CoVia, C0UNTEF? Co-procedural amendment (method) January 23, 1985 Manabu Shiga, Commissioner of the Patent Office1, Indication of the case, Patent Application No. 166963 of 19592, Name of the invention, electronic musical instrument3, Person making the amendment Related Patent Applicant Address 2-6-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Name (
144) Tadashi Kashio, Representative of Casio Computer Co., Ltd.
Male 4, agent address: 1-13-4-5 Nishi-Shinbashi, Minato-ku, Tokyo, date of amendment order 6, drawing to be amended Z Contents of amendments Figures 5 to 8 and 10 are as attached. correct. In addition, Figure 9, which is instructed by the procedure amendment command officer (method), shows the values 0 to 67se (0 to 67) expressed in hexadecimal numbers, using symbols A to F in addition to O to 9. This is a diagram that simply shows the results of exponential conversion of the data in the range (representing numerical values), so it is not a diagram that is not written in Japanese. Therefore, we ask for your understanding that we will not make any corrections to Figure 9. Fig. 5 Fig. 6 Hi-V ABC9876543210 000000000DEFG QOI 0OOOOIDEFG 100 001DEFGII1 101 QIDEFGllll llo 1DEFG11 111 Fig. 8 Fig. 1-2 FC (G Fig. 10 C) [5] [Shigo7Σ]: N mouth i vr7-L5a'
Fpl*'Wl practice↓ 10th F.ゝm-, 2==]■ 工）−〇ko

Claims (1)

[Claims] An electronic musical instrument characterized in that a vibrato speed information setting means, a vibrato depth information setting means, and a data decompression means for data decompression of the setting information are connected to at least one of the above information setting means.