JPS5850352B2 - electronic musical instruments - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic musical instrument, and particularly to an electronic musical instrument that uses coded key information to control generated musical tones, and uses the key information to perform arithmetic processing to achieve a glitsando effect. This invention relates to an electronic musical instrument that can be easily obtained.

A. Description of the Prior Art In recent years, with the rapid development of electronic technology, various electronic musical instruments have been developed. Electronic organs, which are typified by electronic musical instruments, are capable of producing many tones and various sound effects. It is widely used as an instrument that allows for a rich range of expression, and is relatively easy to play, even for beginners.

FIG. 1 is a block diagram showing an example of an electronic musical instrument with a digital configuration, in particular a waveform memory that generates musical tones by reading out a waveform memory that stores musical sound waveforms using encoded key information. FIG. 1 is a block diagram showing the configuration of a read-out type electronic musical instrument.

In the figure, 1 is a key switch circuit provided in the keyboard section, 2 is a key assigner, 3 is a frequency information memory, 4 is an accumulator, 5 is a waveform memory, 6 is a multiplier, 7 is a sound system, and 8 is an envelope waveform generator. Each vessel is shown.

The key assigner 2 detects the on or off operation of the key switch corresponding to each key of the key switch circuit 1 arranged in the keyboard section, and uses key information (referred to as underground key data KD) to identify the pressed key. .

This key data KD is a multi-bit code signal.

) is assigned to one of the sound generation channels corresponding to the maximum number of simultaneous sounds (for example, 12 sounds).

This key assigner 2 stores key data KD representing a pressed key in a storage location corresponding to each channel, sequentially outputs the key data KD stored in each channel in a time-sharing manner, and also stores and retains the key data KD. .

Therefore, when multiple keys are pressed at the same time on the keyboard section, the key data KD representing each pressed key is assigned to a separate channel, and the unique position corresponding to each channel is assigned the key data KD representing each pressed key. Key data KD representing the key is stored.

Each storage location is constituted by, for example, a circular shift register.

Therefore, the key data KD representing the pressed keys assigned to be sounded by the key assigner 2 (that is, the key data stored in the shift register) is sequentially output in a time-division manner in accordance with the time of the assigned channel.

Further, the key assigner 2 time-divisionally outputs an envelope start signal ES shown in FIG. 2a, which indicates that sound should be generated in the channel to which the pressed key is assigned to sound, in synchronization with the time of each channel.

Furthermore, the key assigner 2 time-divisionally transmits a decay start signal DS shown in FIG. output.

These signals ES and DS are used in the envelope waveform generator 8 for amplitude envelope control (sound generation control) for the generated musical tone.

Furthermore, the key assigner 2 receives from the envelope waveform generator 8 the decay end signal DF shown in FIG. After clearing various memories related to the key press, the CPU enters a standby state for subsequent assignment processing of a new key to be pressed.

Therefore, the key assigner 2 outputs the clear signal CC shown in FIG. 2d having a pulse width of l time slot time based on the decay end signal DF to clear the contents of the corresponding channel of the envelope waveform generator 8.

The signals ES, DS, DF, and CC are generated in a time-division manner for each channel time, but in FIG. 2, only a certain channel time is shown for convenience.

The frequency information memory 3 inputs the key data KD sequentially outputted from the key assigner 2 in a time-sharing manner and stores corresponding frequency information values F as shown in Table 1, for example.
This is a memory that outputs .

Note that the numerical value F stored in this frequency information memory 3
is 15 bits in Table 1, with 1 bit representing the integer part and the other 14 bits representing the decimal part.

The F numbers in Table 1 are the numerical values F expressed in binary notation converted to io notation.

In this way, the frequency information value F corresponding to the pitch of each pressed key, which is output from the frequency information memory 3 in a time-division manner for each channel time, is input to the accumulator 4.

The accumulator 4 includes an adder that adds the frequency information value F for each channel at the timing of the clock pulse φ, and an adder that adds the frequency information value F for each channel at the timing of the clock pulse φ. It is equipped with a temporary storage circuit for 12 stages to hold the results.

Therefore, from the accumulator 4, the accumulated value q F (q-1p2.3...
) will be output.

The output of the accumulator 4 (cumulative value qF) generated in this way is supplied to the waveform memory 5 which stores the amplitude values of sequential sample points of the waveform of one desired musical tone, and the readout of the waveform memory 5 is controlled. It will be done.

The musical sound waveform MW sequentially read out for each channel from the waveform memory 5 is multiplied by an envelope control waveform signal EW such as attack, decay, and sustain outputted from an envelope waveform generator 8 in a multiplier 6 to give an amplitude envelope. The musical sound waveform MW' is output to the sound system 7.

The musical sound waveform MW' given this volume envelope is:
A sound system 7 consisting of a filter, an amplifier, a speaker, etc. produces a performance sound.

Therefore, the frequency information value F read out from the frequency information memory 3 in response to the pressed key from the sound system 7
A musical tone is generated at the frequency (pitch) determined by and the waveform shape (timbre) stored in the waveform memory 5.

In this way, the frequency information value F corresponding to the key data KD representing the pressed key is accumulated sequentially in an accumulator,
An electronic musical instrument configured to read out a waveform memory in which one waveform of a desired musical tone is stored using this accumulated output as an address signal to obtain a musical sound waveform is described in detail in, for example, the specification of Japanese Patent Application No. 48-41964 (Japanese Unexamined Patent Publication No. 49130213). , so a detailed explanation of each part will be omitted.

As mentioned above, electronic musical instruments with such a configuration form musical tones by electronic means, so they have a simple configuration and can easily produce a variety of sounds, from sounds close to those of natural instruments to sounds unique to electronic instruments. It can be obtained through musical performance operations and has come to be widely used.

In this case, there has been a strong desire to further improve the performance effect of electronic musical instruments by adding the glissando effect used in natural musical instruments.

B. Disadvantages of the Prior Art However, in order to obtain the glitsand effect in which the pitch of musical tones changes step by step in the electronic musical instrument described above, each part of the keyboard must be struck in sequence at a constant speed. The performance became extremely complex, requiring a high level of technique, especially when playing relatively fast gritsandos.

C. Object and Overview of the Invention The present invention was made in view of the above-mentioned drawbacks of the conventional art, and its object is to provide an electronic musical instrument that controls the pitch of generated musical tones using encoded key information. To provide an electronic musical instrument that automatically produces a glitsando sound effect in which the pitch changes sequentially by semitone over a range of pitches at a pitch a predetermined pitch from the pitch of a pressed key.

Therefore, in the present invention, the glissando tempo control signal that determines the speed of the glissando is counted sequentially from the start of the key press, and the count value is kept as the key information (key data) of the pressed key until the count value reaches a predetermined value. By sequentially adding , a glitsand sound effect in which the pitch of the generated musical tone automatically changes can be obtained.

Hereinafter, the electronic musical instrument according to the present invention will be explained in detail using the drawings.

D Explanation of the configuration and operation of the present invention■ Explanation of the configuration of the present invention Fig. 3 is a block diagram showing an embodiment of the electronic musical instrument according to the present invention, and the same parts as in Fig. 1 will be explained using the same symbols. Omitted.

In this embodiment, key data KD representing each part of the keyboard section is a 7-bit key code KC (KC1
~KC7) and the 2-bit keyboard code indicating the keyboard.
It is composed of a total of 9 bits of K2.

Each pitch shown in Table 2 is assigned to the contents of each code (in decimal notation) "0 to 127" represented by this 7-bit key code KC.

However, since the keyboard section actually has only 61 keys, the key code EC output from the key assigner 2'
only represents "25-85J (pitch of C1-C6)" in decimal notation, and key code K other than "25-85"
C is formed in the glit sand control section 10, which will be described later.

Also, 1. is added to the 2-bit keyboard chord. 2 indicates the keyboard types of the upper keyboard, lower keyboard, and petal keyboard, which are assigned as shown in Table 3.

The key assigner 2' in this embodiment performs the same operation as the key assigner 2 shown in FIG. The above-mentioned key data KD (key code KC, 1 in the keyboard code) represents the key switch that was pressed, that is, the key that was pressed.
．． 2) to the maximum number of simultaneous notes (12 notes in this example)
Assign to one of the corresponding pronunciation channels.

In this case, various signals E output from the key assigner 2'
S, DS, and CC are not directly sent to the envelope waveform generator 8', but are appropriately processed in a glissand control section 10, which will be described later, to produce a glissand effect sound, and then supplied to the envelope waveform generator 8'.

Further, the decay end signal DF sent from the envelope waveform generator 8' is also supplied to the key assigner 2' via the glissand control section 10.

A specific example of this key assigner 2' is, for example, Japanese Patent Application No. 47-1, which was previously filed and published by the applicant of the present application.
25514, Japanese Unexamined Patent Publication No. 49-84216, and the title of the invention "Key Assigner" can be used.

In this case, the envelope start signal BS of this embodiment
corresponds to the signal ES of the above application, the decay start signal DS corresponds to the signal DIS, and the clear signal CC corresponds to the signal CC.

Further, frequency information values F corresponding to pitches C to C9 are stored in the frequency information memory 3' in accordance with the contents of the key code KC shown in Table 2 above.

Now, in FIG. 3, 10 is the key data K output from the key assigner 2' to obtain the glitsand sound effect.
The key code KC of D is sequentially changed in an increasing or decreasing direction and output as a key code KC', and various control signals (ES, DS) between the key assigner 2' and the envelope waveform generator 12 are output.

CC, DF) is a glit sand control section.

The glissando control section 10 includes a glissand switch 10a, a repeat switch 10b, and a truncate switch 10c that control the form of the glissando sound effect to be generated.

The respective outputs of the up switch 10d1 and the chop switch 10e are inputted.

The glitsand control section 10 includes each of the above-mentioned switches 10.
A to 10e are configured to perform the sound generation control operation of the glit sand effect sound shown in Table 4.

Since each of these switches 10a to 10e can be controlled independently, 24+1=17 types of control are performed using the five switches 10a to 10e.

For example, when only the switches 10a, 10c, and 10d are turned on, a glitsando sound effect is obtained in which the pitch increases only in the range of one glitsando period from the time the key is pressed, as shown in FIG. If you release the key in the middle of , the Gritsand sound effect will be stopped immediately.

Moreover, when only the switches 10a and 1od are on,
As shown in Figure 4, even when the key is released, the glitsand period remains 1.
A gritsand sound effect with increasing pitch is generated until the cycle is complete.

Further, switches 10a, 10b, 10c, 10d
When only is turned on, as shown in Figure 4C, the glitsando cycle is repeated until the key is released, producing a glitsando sound effect in which the pitch rises in each cycle, and when the key is released, the glitsando sound effect is produced. The pronunciation is immediately stopped.

Also, a switch 10a. When only 10b and 10d are turned on, as shown in Fig. 4d, the glishando cycle is repeated until the key is released, and a glishando sound effect in which the pitch rises in each cycle is obtained. The Gritsand sound effect continues to be produced until it is completed.

On the other hand, when the up switch 10d is turned on, as shown in FIG.
When d is turned off, a glissando sound effect in which the pitch gradually decreases as shown in FIG. 5 is generated.

In addition, when the chop switch 10e is turned off, the fifth
As shown in FIG. 5D, each glitsando sound effect is continuously sounded legato, and when the switch 10e is turned on, each glissando sound effect is sounded in staccato sound, separated by one note, as shown in FIG. 5d.

Next, a specific example of the configuration of this glissand control section 10 will be explained with reference to FIG.

In FIG. 6, 13a to 13i are key assigners 2'
The input terminals 13a to 13g are input terminals for inputting the key data KD output from the key code KC (KC).
1 to KC7) are input to the input terminals 13h and 13i, and the keyboard code 1. 2 is input to .

14 is an inverter that inverts 2 to the bit of the keyboard code;
Reference numeral 15 denotes an AND gate that matches the bits of the keyboard code with the output (K2) of the l inverter 14 and the output of the glitsand switch 10a, and 16 an AND gate that is output from a variable oscillator (not shown) that determines the speed of change of the glitsand effect. This is a shift register that inputs the sand tempo control signal GTC and sequentially shifts it at the system clock φ (corresponding to the channel time), and has a 12-stage configuration corresponding to the number of sound generation channels.

17 inputs the output of the shift register 16 and is shifted by the clock pulse φ similarly to the shift register 16 described above.
2 stage shift register, 18 is shift register 1
The output of 6 and the output of shift register 17 are connected to inverter 19.
20 is a 3-bit adder that uses the signal GTP as a carry input CI, and 21a to 21c are AND gates that output the signal GTP by determining the match with the inverted signal in the adder 20. Gate 22a~
22c, a 12-stage shift register which is sequentially shifted with a clock pulse φ and supplies the shift output to the addition inputs A1 to A3 of the adder 20;
23 is a 5-bit adder which receives the signal GTY of the carry output CO of the adder 20 as the carry input CI via the AND gate 24; 25a to 25e are the addition outputs S1 of the adder 23;
~S5 are respectively inputted via AND gates 26a to 26e, shifted sequentially by clock pulse φ, and the shifted outputs are supplied to addition inputs A1 to A5 of adder 23.
2 stage shift register, 27 is shift register 2
5d, AND gate for matching the outputs of 25e, 2
8 is an ant gate which receives the output of the truncate switch 10c and the decay start signal DS outputted from the key assigner 2' shown in FIG. 3, and 29 is an ant gate.
30 is a 12-stage shift register that inputs the envelope start signal ES output from the key assigner 2' (Fig. 3) and sequentially shifts it with a clock pulse φ; 31 is an envelope. An ant gate 33 outputs a signal ESP after finding a match between the start signal ES and a signal obtained by inverting the output of the shift register 30 at an inverter 32.
An inverter 35 inverts the signal ESP supplied via the shift register 21c, and an inverter 35 inverts the signal ESP supplied via the shift register 21c.
36 is a 12-stage shift register that sequentially shifts the output of AND gate 35 through an OR gate 31 using a clock pulse φ; 38 is a shift register of shift register 36; An AND gate that supplies the matching output of the output and the inverter 33 to the shift register 36 via the OR gate 37; 39 is the output of the shift register 36; 'signal G;
TY, a signal (DS) obtained by inverting the decay start signal DS by the inverter 40, and a repeat signal RP obtained by matching the output signal of the repeat switch 10b are output to the OR gate 34.
41 is an inverter that inverts the output of the shift register 36 and supplies it to the AND gate 24; 42 is an inverter that inverts the output of the up switch 10d; 43 is an inverter that inverts the output of the shift register 36 and supplies it to the AND gate 24;
44 is an AND gate that searches for a match between the output of the AND gate 15 and the output of the up switch 10d, and 45a to 45e are the outputs of the shift registers 25a to 25e and the output of the ant gate 44. 46a to 46e are AND gates whose inputs are the outputs of inverters 47a to 4γe, which invert the outputs of shift registers 25a and 25e, respectively, and the output of AND gate 43, and 48a to 48e are ant gates. 49 is an AND gate that receives the output of the shift register 21c and the output of the chop switch 10e, and 50 is a shift register 36 supplied via the OR gate 80. 51 is an AND gate whose inputs are the output of the AND gate 49 and the output of the AND gate 15; 53 is an OR gate which inputs each output of the antenna gates SO and SI and outputs a decay start signal DS' to the envelope waveform generator 8' (FIG. 3); 54 is a decay start signal DS and a shift register 36; , the output of AND gate 15, and the decay termination signal D provided by envelope waveform generator 8' (FIG. 3).
55 is an AND gate that receives the decay end signal DF and a signal obtained by inverting the output of the AND gate 15 in an inverter 56; 57 is an AND gate that receives the input signal DF; The OR gate 58 outputs the decay end signal DF' to the key assigner 2' (FIG. 3), and the OR gate 58 adds the bits KC1 to KC7 of the key code KC supplied to the input terminals 13a to 13g, and adds the bits KC1 to KC7 to the OR gates 48a to 48A. The output of the AND gate 43 is supplied to the carry input CIg of the adder 58 and the addition inputs B6 to B7.

The addition outputs 81 to S7 of the adder 58 are sent to the frequency information memory 3' (FIG. 3) as key codes KC'(KC'1 to KC', ).

Note that the Gritsand control section 1 configured in this manner
Before explaining the operation of the glissand controller 10, the configuration of the envelope waveform generator 8' which operates in conjunction with the glissand controller 10 will be explained.

A specific example of the configuration of the envelope waveform generator 8' is shown in FIG.

In FIG. 1, 60 is the attack clock pulse ACP.
61 is a decay clock oscillator, and 62 is an AND gate that passes the attack clock pulse ACP output from the attack clock oscillator 60. , a signal (AF) obtained by inverting an envelope start signal ES sent out from the glissand control unit 10 and an attack end signal AP outputted from a first determination circuit 11 (described later) by an inverter 63.

64 is an AND gate that passes the decay clock pulse DCP (the period can be arbitrarily varied and the pulse width is 12 channel time) output from the decay clock oscillator 61, and the decay start signal DS sent from the glit sand control section 10. ' and a signal (DF) obtained by inverting a decay end signal DF output from a second determination circuit 72 (described later) by an inverter 65.

66 is a shift register with a 6-bit 12-stage configuration, and 61 is an active clock pulse ACP output from the AND gate 62 or a decay clock pulse DCP output from the AND gate controller 4, which is supplied to the carry input CI via an OR gate 68. Each bit output of the shift register 66 is supplied to the addition inputs A1 to A6, and the addition inputs A1 to A6 are added to the carry input CI, and the addition outputs S1 to S6 are processed by an AND gate. It is supplied to the shift register 66 via 69a to 69f.

70 is a memory in which the waveform amplitude values of the attack part and the decay part of the desired envelope control waveform signal EW are stored as analog values, as shown in FIG. 8, and the attack part is stored in addresses O to 15. Further, a decay portion is stored in addresses 16-63.

This memory 70 is addressed by the output of the shift register 66 which is outputted in a time-division manner for each channel, and the waveform amplitude value of the envelope control waveform signal EW is read out in a time-division manner for each channel.

71 is a first determination circuit that sends out an attack end signal AF when the output of the shift register 66 (addition outputs S1 to Sa of the adder 67) exceeds "15" in decimal notation; 72 is the output of the shift register 66 (addition output Addition output S1 of the device 67~
Sa) reaches "63" in decimal notation, a second determination circuit sends out a decay end signal DF;
75 is a shift register 73 with a 12-stage configuration that inputs and sequentially shifts with a clock pulse φ.
An AND gate 77 receives the output CC' of the AND gate 75, the clear signal CC, and the initial clear signal IC. The OR gate 78 inverts the output of the OR game 1-77 and outputs the AND gate 69a-69f.
This is an inverter that supplies

■ Description of operation of the present invention Next, as described above, the third
The operation of the electronic musical instrument shown in the figure will be explained with a focus on the glissando control section 10.

(a) Normal operation When a key in the keyboard section is pressed with the glit sand switch 10a turned off, the key assigner 2' shown in FIG. 3 displays key data K representing the pressed key.
D (Table 2) is generated, and this key data KD is allocated and stored in one of the blank channels of the sound generation channels (there are 12 channels), and the key data KD is time-divided in the allocated channel time. is output as follows.

The key assigner 2' also receives an envelope start signal E shown in FIG.
S is output in synchronization with the assigned channel time.

On the other hand, the glissando control section 10 shown in FIG.
3a to 13i, and enter the key code KC (KC
1 to KC7) are supplied to the addition forces A1 to A7 of the adder 58.

On the other hand, in the Gritsand control section 10 (Fig. 6),
Since the glit sand switch 10a is turned off, the keyboard chords input to the input terminals 13h and 13i are 1. Regardless of the contents of 2 (even if 2 "1,0" is input to 1 as the keyboard code representing the upper keyboard), the output of the AND gate 15 is always O''.

Therefore, the outputs of the AND gates 1-43 and 44 become "0", and accordingly, the AND gates 45a to 45e.

46a to 46e are all inoperable, and the or gate 48
The outputs of a to 48e are all '0'.

As a result, the carry input CI of the adder 58 and the addition forces B1 to B7 all become °゛O'', and the addition forces A1 to A
The contents of 7 are output as they are as addition outputs 81 to S7.

Therefore, in this case, the key code KC' (K
C'1 to KC'7) are sent to the frequency information memory 3'.

Therefore, from the frequency information memory 3', the key assigner 2'
The frequency information value F corresponding to the key code KC output from the key code KC is read out from the waveform memory 5, and the musical sound waveform M'W is read out from the waveform memory 5 at a period (frequency) corresponding to the pitch of the pressed key, as in the case of FIG. Further, the envelope start signal ES output from the key assigner 2' is supplied to the envelope waveform generator 8' (FIG. 7) via the line L1 of the glissando control section 10.

In the envelope waveform generator 8', an initial clear signal IC (generated when the power is turned on) is first inverted via an OR gate 17 and an inverter 78, and then output to each AND gate 69.
a~69f, so each AND gate 69a~
69f is inactive, and the contents of all stages of the shift register 66 are cleared.

Therefore, the attack end signal AF and the decay signal output from the first judgment circuit 71 and the second judgment circuit 72, which detect that the output of the shift register 66 becomes "15" or "63" (in decimal notation), respectively. The end signal DF is at zero.

Also, the initial clear signal IC disappears ("0"
), the output of the OR gamer 177 becomes 0'', the output of the inverter 18 becomes 1'', and the AND game controller 9a~
69f becomes operational.

In this state, the envelope start signal ES
is supplied, the AND gate 62 becomes operational,
Along with this, the attack clock pulse ACP output from the attack clock oscillator 60 at the relevant channel time (the channel time at which the signal ES is generated) is taken out from the Antogame Toro 2.

Furthermore, since the decay start signal DS' is not generated in the AND gate 75 to which the envelope start signal ES is input, its output is 0'' (because the output of the shift register 73 is 0'').

The attack clock pulse ACP is inputted to the carry input CI of the adder 67 via the OR gate 68.

The adder 67 has an addition force A (6 bits) and a carry force C.
and the active clock pulse ACP supplied to T, are added for each channel, and the addition output S (6 bits) is sent to the shift register 6 via AND gates 69a to 69f.
Supply to 6.

The shift register 66 stores and outputs the addition output S for each channel of the adder 67 for 12 channel times up to the next channel time.

Therefore, the pulse ACP supplied to the carry input C'I of the adder 67 and the output of the shift register 66 supplied to the addition input A are related to the same channel and are synchronized.

As a result, the adder 67 outputs the attack clock pulse ACP.
Each time St is generated, "1" is added to the contents (output) of the corresponding channel of the shift register 66, and this added value (St is supplied to the shift register 66 again.

Therefore, the shift register 66 outputs a signal that sequentially increases by "1" from "0" in synchronization with the active clock pulse ACP during the channel time.

It should be noted that the shift register 66 always outputs a tt On signal during channel times to which no sound generation is assigned (the envelope start signal ES is not generated).

For this reason, the memory 70 is addressed by a signal outputted from the shift register 66 and sequentially increases as "1°2.3...", and the envelope control waveform shown in FIG. 8 is stored at the address. Each amplitude value of the signal EW is read out sequentially.

When the value of the output signal of the shift register 66 reaches "15", which is the attack end portion of the envelope control waveform signal EW shown in FIG. 8, the attack end signal AF output from the first determination circuit 71 becomes 1". , accordingly, the output of the inverter 63 becomes 0'', and the AND gate 6
2 becomes inactive, the attack clock pulse ACP is not output, and the addition operation is stopped.

Therefore, since the value of the output signal of the shift register 66 output during the channel time continues to be "15", the envelope control waveform signal EW also maintains a constant level and enters the sustain state. Multiplier 6 (FIG. 3) adds amplitude envelopes for attack and sustain portions to musical sound waveform MW.

This sustain portion continues until the decay start signal DS'("1") is supplied to the envelope waveform generator 8'.

The decay start signal DS' is supplied to the glitsand control section 10.
It is output from the OR gate 53 (FIG. 6).

In the glide sand control section 10, the glide switch 10a is off as described above, so the output of the AND gate 15 is always 0'', and as a result, the OR gate 5
AND gate 50, which is the input of signal 3, is always inactive, and AND gate 51 is enabled.

Therefore, the decay start signal D in this case
S' is sent only through the AND gate 51, and the input to the AND gate 51 is the decay start signal DS sent from the key assigner 2'. The decay start signal DS' supplied to the envelope waveform generator 8' only when the start signal DS is generated is 1''.
becomes.

Next, the above-mentioned decay start signal DS' was generated (
The operation of the envelope waveform generator 8' in the case of "1") will be explained.

As mentioned above, when the pressed key is released, the Decay SF-1 signal DS shown in FIG. 2 is generated from the key assigner 2' in synchronization with the channel time to which the pressed key is assigned to sound. This signal DS is passed through the AND gate 51 and OR gate 53 of the Glissand control unit 10 and sent as a decay start signal DS' to the shift register 73, impark 76, and AND gate controller 4 of the envelope waveform generator 8' (FIG. 7). is input.

The output of the inverter 76 becomes 0" as the signal DS' becomes 1", rendering the AND gate 77 inoperative.

Therefore, the output of inverter 18 remains at 1'' and continues to enable AND gates 69a-69f.

On the other hand, since the signal DS'("1") is input to the AND gate 64, the AND gate 64 becomes operable (
In this case, since the value of the output signal of the corresponding channel of the shift register 66 is "15" as described above, the decay end signal DF from the second determination circuit 72 is O", and the output of the inverter 65 is °°1". ).

As a result, the AND gate 64 extracts the decay clock pulse DCP output from the decay clock oscillator 61 at the relevant channel time (the channel time at which the signal DS' is generated).

This decay clock pulse DCP is supplied via an OR gate 68 to a carry input CI of an adder 67.

As a result, the adder 67 outputs the decay clock pulse DCP
Each time ``1'' is generated, "1" is added to the contents of the corresponding channel of the shift register 66 (output of the shift register 66), and the addition output S (6 bits) is sent to the AND gate 69a-6, which is in the operating state. It is input to the shift register 66 via 9f.

In this case, since the contents of the corresponding channel of the shift register 66 are the value "15" as described above, the contents of the shift register 66 are sequentially sent from "15" to "15" in synchronization with the decay clock pulse DCP during the channel time.
” is output.

Therefore, the memory 70 is addressed by a signal outputted from the shift register row 6 and increases sequentially as "16, 17, 18 degrees...", and the address (16, 17
, . . . ) and sequentially outputs each amplitude value of the envelope control waveform signal EW of the decay portion shown in FIG. 8.

Then, when the value of the output signal of the shift register 66 at the relevant channel time reaches "63" which is the end address of the decay part, the decay end signal DF output from the second determination circuit 12 becomes 1", and accordingly. The output (DF) of the inverter 65 becomes 0'', the AND gate controller 4 becomes inactive, and the decay clock pulse DCP is no longer output, and the addition operation of the adder 67 is completed.

In this way, the envelope control waveform signal EW of the decay portion accompanying the key release is output from the envelope waveform generator 8'.
is generated, and as a result, the multiplier 6 (FIG. 3) imparts to the musical sound waveform MW the amplitude envelope of the decay portion following the sustain portion.

On the other hand, the second determination circuit 72 of the envelope waveform generator 8'
The decay end signal D generated as described above from
F (“1”) is the grit sand control unit 10 (sixth
The signal is sent to the AND gate 55 in FIG.

The AND gate 55 has the output u 09 of the AND gate 15.
+ is input through the impark 56, which enables the AND gate 55 to operate.

Therefore, the signal DF is supplied to the key assigner 2' via an AND gate 55 and an OR gate 57 as a decay end signal DF'.

In this case, the AND gate 54 is immobile due to the output QOIJ of the AND gate 15, so the AND gate 54
From 4 onwards, the decay end signal DF' is not generated.

When the decay end signal DF' is input, the key assigner 2' clears the memory of the key data KD of the channel and sends out the clear signal CC at the time of the channel (the clear signal CC sets the signal DF' to 1).
(2 channels are time-delayed).

This clear signal CC is input to the OR gate 77 of the envelope waveform generator 8' via the line L2 (FIG. 6) of the glissand control section 10.

Therefore, the output of the OR gate 11 is still 1'' during the channel time, the output of the inverter 78 is O'', and the AND gates 69a to 69f are inoperative during the channel time.

As a result, the contents of the corresponding channel in the shift register 66 ("63") are cleared to "0".

As described above, when the glit sand switch 10a is turned off, the envelope control generated from the envelope waveform generator 8' corresponds to the pitch of the pressed key and is generated from the envelope waveform generator 8', as in the case of FIG. A musical tone having an amplitude envelope corresponding to the waveform signal EW is generated from the sound system 7.

(b) Glissando operation In the electronic musical instrument shown in FIG. 3, a glissando sound effect is generated by turning on the glissando switch 10a.

In this embodiment, the chrysando sound effect is performed only on the upper keyboard, and normal performance is performed on the lower keyboard and pedal keyboard.

That is, the AND gate 15 of the glit sand control section 10 (FIG. 6) has an input terminal 13h.

1. for the keyboard code input to 13i. It is operable only when 2 is l 1 representing the upper keyboard, OJ (Table 3), and the keyboard code Kl representing the lower keyboard and pedal keyboard is 2 'o, i, J (lower keyboard), rl
, IJ (pedal keyboard) is inactive.

Therefore, the output of the AND gate 15 is always 0" during the channel time to which the depressed keys of the lower keyboard and the pedal keyboard are assigned, resulting in the normal operation described above.

The glissando operation when the upper keyboard is pressed with the glissand switch 10a turned on will be described in detail below.

■ Noon code K for generating gritsand sound effect
Regarding the formation of C', a relatively long period glit sand tempo control signal G T C shift L/Jister 1 is generated from an oscillator (not shown).
6, the shift register 16 reads this glissando tempo control signal GTC at the timing of the system clock φ, sequentially shifts it, and supplies this shift output to the shift register 17.

The shift register 17 reads the output of the shift register 16 at the timing of the system clock φ, shifts it sequentially, and sends the output to the AND gate 1 via the impark 19.
Supply to 8.

The output of the shift register 16 is "1" in the AND gate 18.
and the period in which the output of the shift register 17 is “0”,
In other words, the signal GTP is synchronized with the rising edge of the gliss sand tempo control signal GTC over a period of 12 channel times (corresponding to the time equivalent to 12 system clocks φ).
Output.

Therefore, the shift registers 16, 17, the AND gate 18, and the inverter 19 send a signal having a time width corresponding to the maximum number of simultaneous sounding channels (12 channels) each time the asynchronous glissando tempo control signal GTC is supplied. This constitutes a synchronization circuit that generates GTP.

In this way, the Gritsando tempo control signal GTC
The signal GTP generated from the AND gate 18 each time is supplied to the carry input CI of the adder 20.

The adder 20 adds the addition inputs A, .about.A3 and the carry input CI for each channel, and sends the addition outputs S, .about.S3 to the shift register 2 via AND gates 22a to 22c.
1a to 21c.

The shift registers 21a to 21c are used to store and hold the addition outputs 81 to S3 of the adder 20 for 12 channels until the next channel time.
Each output of a to 21c (12th stage output) is added to adder 2.
The addition inputs A, ~A3 are 0.

As a result, the adder 20 and shift registers 21a to 21
c sequentially adds the signal GTP (pulse width is 12 channel time) supplied to the carry input CI for each channel, and the added value is IO, l, 2, 3, . . . at the timing of the signal GTP. ...7'' and increase sequentially.

When the addition value becomes "7" and the next signal GTP is generated, the adder 20 generates a carry output CO (signal GTY), and the addition outputs S, ~S3 become "0", and the same addition is performed thereafter. Repeat the action.

The operation of AND gates 22a to 22c is controlled by the output of inverter 33.

When the envelope start signal ES shown in FIG. 9a is output from the key assigner 2' shown in FIG. The data is read into the shift register 30 at the appropriate timing and shifted sequentially.

The output signal of this shift register 30 is inputted to an AND gate 31 via an inverter 32, where it is determined that it matches the envelope start signal ES.

The AND gate 31 receives the signal E shown in FIG.
Output SP.

Signal ESP is supplied to inverter 33 via OR gate 34 and inverted.

Therefore, the output of the impark 33 becomes n 01+ at the channel time in which the signal ESP is generated (corresponding to the channel in which the signal ES is generated) and the AND gate 22
a to 22c are rendered inoperable.

As a result, the contents of the stage corresponding to the corresponding channel (the channel in which the signal ESP is generated) of the shift registers 21a to 21c become f+091.

Since the reset operation of the shift registers 22a to 22c is performed only at the rising edge of the envelope start signal ES, the adder 20 and the shift register 2
1a to 21c are the above-mentioned signals GT after the reset operation.
Performs an addition operation of P.

Therefore, the signal GTY (FIG. 9e), which is the carry output CO of the adder 20, is the envelope start signal ES.
The signal GTP is repeatedly output every eight times from the time when the added value of the channel is reset (key press time) at the rising edge of FIG. 9a.

That is, the signal GTY is obtained by dividing the signal GTP into 1/8 independently for each channel.

In this way, the signal GTY is output from the adder 20 in synchronization with the channel time based on the key press timing.
(FIG. 9e) (signal GTP divided by eight) is inputted to the carry input CI of the adder 23 via the AND gate 24.

The adder 23 receives its addition inputs A1 to A5 and the carry input C.
The signal GTY supplied to I is added for each channel and the seven addition outputs 81 to S5 are sent to AND gates 26a to 26.
It is supplied to shift registers 25a to 25e via e.

The shift registers 25a to 25e store and hold the addition outputs 81 to S5 of the adder 23 for 12 channel times until the next channel time.
Each output of 5e becomes addition power A1 to A5 of adder 23.

Therefore, the adder 23 and each shift register 25a to 2
5e means that the signal GTY is sequentially added for each channel.

The respective outputs of the shift registers 25a to 25e, which sequentially add this signal GTY for each channel, are used in the adder 58 as a 5-bit glissand control signal G (FIG. 9f), as will be described later.

In this case, each input side of the shift registers 25a to 25e receives the signal ESP output from the AND gate 31 described above.
(FIG. 9C) is provided with AND gates 26a to 26e controlled by the output of the inverter 33 which is an inversion of the output of the inverter 33.
6a to 26e become inoperable, and the stored value of each shift register 25a to 25e corresponding to the corresponding channel time (the channel time at which the signal ESP is generated) is reset to N0+1.

That is, each stage of the shift registers 25a to 25e is cleared when the envelope start signal ES is generated at the channel time of the channel to which sound generation is assigned, that is, at the start of key depression, and then the signal GTY is sequentially added to the channel time to generate the glitz sand. Control signal G (9th
Output figure f).

In this case, the signal G (FIG. 9f) is the signal GTY (9th
Since it is synchronized with Figure e), the shift registers 25a~
The glissando control signal G output from the glissando tempo clock GTC is also
0°1.2.3...'' and so on.

This glissand control signal G (shift register 25a~
25e) is inverted by AND gates 45a to 45e or inverters 47a to 47e and output to AND gate 4.
6a to 46e, and further or gate 48a to 48
It is supplied to the adder 58's addition power -, ~B5 via e.

When the up switch 10d is turned on (up mode) When the up switch 10d is turned on, the AND gate 44 outputs the "'1" signal, and this 1jl signal enables the AND gates 45a to 45e to operate. ing.

Therefore, the glissand control signal G (5 bits) output from the shift registers 25a to 25e is supplied to the addition signals B, ~B, of the lower 5 pits of the adder 58 via the analog gates 45a to 45e. Here, the key code KC (KC, to KC7) of the key data KD output from the key assigner 2' (FIG. 3) and input to the addition inputs A1 to A7 is added to the addition output 81.
~S7 is output to the frequency information memory 3' (FIG. 3) as a key code KC'(KC',~KC'7).

Therefore, for example, from key assigner 2' (Fig. 3) to 1
If the key code K (J37J (pitch C2) in 0-decimal notation is output, the adder 58 adds "0, 1, 2, 3..." to this key code "37". The changing glissand control signal G is added, and the adder 58 outputs a key code KC' that changes sequentially as "37, 38°, 39...".

In this case, as shown in Table 2, the key code KC (KC') represents a pitch on the chromatic scale as the value increases by 1, so the waveform changes accordingly. The musical sound waveform MW read out from the memory 5 corresponds to the generation of the glissando tempo control signal GTC (signal GTC
) pitch is C2, C"2.D2...
-Gritsand effect is applied by increasing the pitch by semitones.

In this embodiment, the glissando tempo control signal GTC is frequency-divided by 178 in the adder 20,
The reason why the glitsando performance is performed using this 1/confused signal GTY is that multiple keys are pressed at different times within one cycle of the glitsando tempo control signal GTC, which has a relatively long cycle. In this case, the purpose is to maintain a relative shift in the key press timing of each pressed key so that each glitsando performance can be performed based on each pressed key.

That is, by frequency-dividing the glissando tempo control signal GTC by 1/8 in the adder 20, the signal GTC is
One period is divided into eight sections, and differences in key press timing are determined in these eight divided sections.

As a result, when a plurality of keys are pressed, each guitar sand performance is started based on each key press timing (approximately coincident with the key press timing).

If the glitsando tempo control signal GTC is input to the ground adder 23, the glitsando effect sound for multiple keys pressed within one cycle of the signal GTC (the key pressing timings are different) is the signal GTP. It is commonly pronounced at the timing of

In other words, the glitsando performance corresponding to each key depression proceeds at a common timing, which does not match the key depression timing of the keyboard section and is unnatural.

In this regard, according to the embodiment of the present invention, the above-mentioned inconvenience is eliminated, and in this case, by increasing the number of bits of the adder 20, more accurate key press timing can be determined.

When the up switch 10d is turned off (descending mode) When the up switch 10d is turned off, the AND gate 44 is inactive and the AND gate 43 outputs the "1" signal.
6a to 46e are operational.

Therefore, the 5-bit glissand control signal G output from the shift registers 25a to 25e is applied to the inverter 4.
AND gates 46a to 46e and OR gate 48 which are enabled to operate after being inverted at 7a to 47e.
The signals are inputted to the addition forces B1 to B5 of the adder 58 via a to 48e.

That is, in this state, the glissando control signal G
All bits are inverted (C3) and adder B of adder 58
1 to B5.

Further, the tl 151 signal output from the AND gate 43 is added by the adder 58 B6. B7 and carry input CI.

In this way, the adding force B (B) of the adder 58 is added.

.about.B7) and the signal "'1" to the carry input CI, the adder 58 performs a substantial subtraction operation.

Note that since the subtraction operation using such an adder is well known, it will not be described in detail.

Therefore, in this case, the addition output S(
S, ~S7) outputs a subtracted value obtained by subtracting the value of the glissando control signal G from the value of the key code KC supplied to the adding human power A (A, ~A7).

For example, the value of key code KC is r37j in decimal
(pitch C2), the addition output of the adder 58 as the value of the glitsando control signal G changes to "0, 1, 2°3, ..." (in decimal notation) 5 (81~S7
) from "37, 36, 35, 3, i,...
...'' and the key code KC'(KC'
, ~KC'7) are output, and the musical tone generated from the sound system 7 accordingly has a pitch of c2. B, ,
A, +, A, .

. . . It becomes a glissando sound effect that gradually descends by semitones.

■ Regarding one period of glitsando performance, as described above, the value of glitsando control signal G from the start of key depression (key depression in the upper key position) changes to "0" in response to the cycle of glitsando tempo control signal GTC. ．■、
2, 3. ...'', and this produces a glitsand sound effect that rises or falls by a semitone from the pitch of the pressed key, but the final value of this pitch change (that is, the glytsand sound effect The final pitch) is set as follows.

That is, the pitch change due to glissando is instructed by the glissando control signal G output from the shift registers 25a to 25e, and the final value of the pitch change is the final value of signal G.

As mentioned above, the glissand control signal G has 5 bits, and its maximum value is J31J (in decimal notation), which ranges from "0" to "
31'', but in this embodiment, the signal G
The maximum value (final value) of is set to "24".

The AND gate 27 detects that the glissando control signal G has become "24".

Since "24" in decimal notation is "11000" in binary notation, each output of shift registers 25d and 25e is input to AND gate 27, and both outputs are "1".
” (when the signal G becomes “24”), the AND gate 27 outputs the signal G24 (FIG. 9g).

This signal G24 is input to AND gate 35 via OR gate 29.

Other inputs of the AND gate 35 include the output of the inverter 33 (normally "lu") and the output signal GA of the shift register 21c (Fig. 9d: signal GTP is changed to 1/4
A frequency-divided signal) is supplied.

Therefore, the AND gate 35 outputs the "■" signal after a predetermined period of time (172 cycles of the signal GA: 4 cycles of the glissando tempo control signal GTC) has elapsed since the signal G24 was generated.

This 1'' signal is input to the shift register 36 via the OR gate 37, stored in the stage corresponding to the channel in which the signal G24 was generated, and outputted as the signal GF (FIG. 9h) after 12 channel times.

The signal GF is an AND gate 38. It is cyclically held via the OR gate 37 and the shift register 36.

Note that by inputting the signal GA to the AND gate 35, the signal G2
4 is delayed by a predetermined period of time because the signal GF corresponding to the output of the AND gate 35 is used as the decay start signal DS' as described later.

In this way, when the glissand control signal G reaches "24", the signal GF is generated.
is inverted by an inverter 41 and supplied to the AND gate 24, making the AND gate 24 inoperative.

As a result, the signal GTY is not input to the adder 23, and no further addition operation is performed, and the glissand control signal G continues to be in the state of "24".

Therefore, the pitch change due to glitsando is two octaves above or below the pitch of the pressed key, and the target value (final value) is the pitch of two octaves above or below the pitch of the pressed key.
A glitsando performance is performed as follows, and this constitutes one period (one cycle) of the glitsando.

In addition, in this example, as mentioned above, the glitsando performance is always two octaves away from the pitch of the pressed key (
The key code KC is played at a pitch corresponding to two octaves above and below (c knee c9. C-, ~Bo) the pitch C1 to C6 of the actual 61 keys on the keyboard. is assigned.

Frequency information values F corresponding to pitches C, ~C0 (key codes rlJ ~ "109J") are stored in the frequency information memory 3'.

(2) Repetition of one period of glitsando performance In this embodiment, one period of glissando performance described above can be selectively repeated.

Repeating the Gritsand cycle means that the Gritsand control signal G is forced to "G" after reaching the maximum value "24".
This is done by returning it to 0.

The repeat switch 10b makes this selection.

When the repeat switch 10b is off (single mode) When the repeat switch 10b is off, the AND gate 39 is inactive and the only input to the OR gate 34 is the signal ESP output from the AND gate 31.

When the signal ESP is generated (generated once in synchronization with the rise of the envelope start signal ES during the channel time to which the pressed key is assigned to sound), the contents of the corresponding channel in the shift registers 25a to 25e are cleared, as described above. Gritsando performance will be performed.

In this case, the signal ESP is generated once at the start of key depression and is not generated thereafter, so that the glissando performance is performed for only one period (FIG. 4b).

When the repeat switch 10b is on (repeat mode) When the repeat switch 10b is on, the AND gate 39 is operable, and the AND gate 34 is connected to the OR gate 34 that controls the generation of one cycle of glyph sand.
Signal ESP from 1 and signal RP from AND gate 39
is input.

With the generation of the signal ESP, the operation of one glyph sand cycle is started, and a glyph sand performance is performed.

When the glissand control signal G reaches the maximum value "24", the AND gate 27 outputs a signal G24 (FIG. 9g).

As described above, this signal G24 is supplied to the shift register 36 via the OR gate 29, AND gate 35, and OR gate 37, and becomes the signal GF (FIG. 9h).

Signal GF disables AND gate 24, inhibiting further changes in glissand control signal G (becoming r25J).

Further, the signal GF is input to an AND gate 39.

The other input of the AND gate 39 is a repeat switch 10.
b output (in this case "1"), a signal DS which is the inverted decay start signal DS from the key assigner 2' (in this case, the key is being pressed and DS is "1"), and a signal which is the carry output CO of the adder 20. GTY is supplied.

Therefore, the signal RP is generated from the AND gate 39 at the channel time when the next signal GTY is generated after the glissand control signal G becomes "24".

This signal RP is inverted via an OR gate 34 and an inverter 33 and sent to AND gates 22a to 22c.

Shift registers 21a to 21a with 26a to 26e inoperable
21C Clear the contents of the stage corresponding to the channel of 225a to 25e.

As a result, the glissando control signal G becomes "0", and one cycle of glissando performance is started again in the same manner as described above (FIG. 4d).

■ Regarding the relationship between releasing the pressed key and playing Gritsando (1)
), a glitsando performance is performed (a glitsando effect is generated) as the key is pressed as described above, but when the pressed key is released in the middle of a glitsando performance, the process is as follows: There are two ways: to stop the glitzando performance when the key is released (suspension mode), and to continue the glitzando performance until one cycle of the glitzando performance is completed even if the key is released, and then stop it at that point (completion mode). It can be done selectively,
The truncate switch 10c makes this selection.

When the truncate switch 10c is off (completion mode) When the truncate switch 10c is off, the AND gate 28 is inactive.

As mentioned above, the signal GF output from the shift register 36 controls the progress of the glissando performance.

When the signal GF is generated, the change in the glitsand control signal G is prohibited (because the AND gate 24 becomes inactive),
Gritsando performance is canceled.

The signal GF is the output of the AND gate 35, i.e.
- is generated based on the output of the gate 29.

One input of the OR gate 29 is the output of the AND gate 27 (signal G24), and the other input is the output of the AND gate 28.
This is the output of

In this case, since the AND gate 28 is inactive, its output is always '0'.

Therefore, in this state, the signal GF is generated only by the output of the controller 27 (signal G24).

The AND gate 27 has a Gritsand control signal G of “24”.
, that is, when the glitsando performance reaches the final value (target value) of one period, the signal G24 is output. Therefore, the signal GF is generated for the first time when one period of the glissando performance is completed.

As a result, even if the pressed key is released, the glitsando performance continues until the cycle is completed, and is stopped at the time when the cycle is completed (FIGS. 4, 4D).

When the truncate switch 10c is on (suspension mode) When the truncate switch 10c is on, the AND gate 28 is operable.

Therefore, when the pressed key is released and the decay start signal DS is generated from the key assigner 2'(DS2"1"
), the output of the AND gate 28 becomes "1", or
The output of G29 also becomes ``1'', which generates the signal GF and immediately stops the Gritsando performance (Fig. 4 a, C). A glitsando sound effect in which the pitch changes (rises or falls) sequentially is generated, and an envelope is applied to this glissando sound effect in the following manner.

In addition, in this example, each glissando sound effect that accompanies a change in pitch is given an envelope with an attack part and a decay part to separate each sound effect one note at a time (staccato mode). It is possible to select a case where a series of continuous envelopes are given to the sound effects so that the envelopes of each sound effect are continuous (legato mode), and the chop switch 10e is used to make this selection.

An envelope is applied to the glissando sound effect by an envelope control waveform signal EW generated from an envelope waveform generator 8'.

The envelope waveform generator 8' is connected to the glissando control section 1.
In response to the generation of the envelope start signal ES output from 0, the envelope control waveform signal E of the attack portion is generated.
W, and in response to the generation of the decay start signal DS', the envelope waveform control signal EW of the decay part is generated.
As mentioned above in the normal operation section,

Here, the generation of the envelope start signal ES and the decay start signal DS' during a glissando performance will be explained.

(Generation of Envelope Start Signal ES) Since the envelope start signal BS output from the key assigner 2' is sent as is via the line L1 of the glissand control section 10, the operation is exactly the same as in the normal operation described above.

(Generation of Decay Start Signal DS') The Decay Start Signal DS' is generated by the Glitzando control unit 10.
is generated from the OR gate 53.

The outputs of the AND gates 50 and 51 are input to the OR gate 53, and the AND gate 51 receives the output of the AND gate 15 +1 I n when performing a glitsando.
Since the key assigner 2' is always inactive due to
The key start signal DS output from the AND gate 51 is blocked and is not supplied to the OR gate 53.

Therefore, during this glissando performance, only the output of the ant gate 50 is input to the or gate 53 (the ant gate 50 is connected to the ant gate 1).
5 output tl 1 tt).

The output of the OR gate 80 is input to the AND gate 50 .

The output of the shift register 36 (signal GF) and the output of the ant gate 49 are input to the or gate 80, and either the output of the shift register 36 or the output of the ant gate 49 becomes 1''. When Orgate 80,
A decay start signal DS' is sent out via an AND gate 50 and an OR gate 53.

When the chop switch 10e is off (legato mode) When the chop switch 10e is off, the AND gate 49 is inactive.

Therefore, in this state, only the output signal GF of the shift register 36 is input to the OR gate 80.

Now, when a key is pressed on the upper keyboard and an envelope start signal BS is generated from the key assigner 2' in response to the sound generation assignment of the pressed key (FIG. 9a), this signal ES is sent to the glitsand controller 10. The envelope waveform generator 8' (FIG. 7) is connected via line L to the envelope waveform generator 8' (FIG. 7).
1-52, 75.

Therefore, the envelope control waveform signal EW of the attack part and the connection part is output from the envelope waveform generator 8'.
is generated.

Therefore, an envelope as shown in FIG. 9j is given to each glissando sound effect.

Then, when the signal GF is output from the shift register 36 (when the glitsando sound effect reaches its final value, that is, when the glissando control signal G reaches "24", or when the truncate switch 10c is turned on, the interruption mode The pressed key is released and the decay start signal D
When S is generated, that is, when the Gritsando performance is stopped (Fig. 9h), the decay start signal DS'
is generated (FIG. 9i), and this signal DS' is input to the AND gate 64, shift register 73 and inverter 76 of the envelope waveform generator 8' (FIG. 7).

As a result, the envelope waveform generator 8' generates the envelope-based signal EW of the decay portion (as explained in the normal operation section).

Therefore, the envelope of the decay part is given to the glissand sound effect as shown in FIG. 9j.

This causes a series of Gritsand sound effects to be played legato in sequence.

In this case, it will be easily understood that if the repeat switch 10c is turned on, the envelopes of the attack part, connection part, and decay part are applied to each period of the glissando performance.

Note that the signal GF is generated based on the output of the AND gate 35;
is input, and the generation of the signal GA is a condition for forming the signal GF shadow.

This is to give the final glitsando sound effect an envelope at least at the connection portion outside the half period of the signal GA (four periods of the glissando tempo control signal GTC) when the glissando performance is stopped.

By the way, if the generation of the signal GA is not a condition for generating the signal GF (that is, if the signal GA is not supplied as one of the inputs of the anttoge'-to 35), the envelope of the decay part will suddenly be applied to the final gris sand effect sound. will be given.

When such a series of glissand sound effects are generated and the decay portion of the envelope control waveform signal EW is completed, the second signal of the envelope waveform generator 8' (FIG. 7) is generated.
The determination circuit 72 generates a decay end signal DF (FIG. 9, 1).

This decay end signal DF is transmitted by the glit sand control section 10 (
The signal is input to AND gates 54 and 55 in FIG.

In this case, the AND gate 55 is inoperative, and the AND gate 54 is enabled.

Other inputs of the AND gate 54 are supplied with the output +1199 of the AND gate 115, the signal GF, and the decay start signal DS.

In this state, the signals GF and DS are both l''', so the decay end signal DF is output from the AND gate 5.
4. The decay end signal DF' is supplied to the key assigner 2' via the OR gate 57.

When the decay end signal DF' is input, the key assigner 2' clears the memory of the key data KD of the channel and sends out the clear signal CC at the time of the channel.

Thus, the glitsando performance for the pressed key is completely completed.

When the chop switch 10e is on (staccato mode) When the chop switch 10e is on, the AND gate 49 becomes operable and the output (signal GA) of the shift register 21C is output.

In this case, the output of the shift register 36 (signal GF) and the output of the AND gate 49 (signal GA) are input to the OR gate 80, but since the signal GF is always generated at the timing of the signal GA, the signal GF are substantially irrelevant, and the decay start signal DS' is generated by the signal GA.

Signal GA is signal GTY (carry output CO of adder 20).
), that is, in the latter half of the change period of the glitzand control signal G (see e, d, and f in FIG. 9). k) will be generated in the latter half of each gritsand sound effect.

Now, when a key is pressed on the upper keyboard and an envelope start signal ES is generated from the key assigner 2' in response to the sound generation assignment of the pressed key (FIG. 9a),
This signal ES is connected to the line L of the glit sand control section 10,
The signal is input to the AND gates 62 and 75 of the envelope waveform generator 8' (FIG. 7).

Therefore, the envelope control waveform signal EW of the attack portion is generated from the envelope waveform generator 8'.

As a result, the 9th effect for the 1st Gritsand effect
An attack envelope is applied as shown in Figure m.

Then, in the second half of this first glitsand sound effect, the decay start signal DS' is generated as described above (Fig. 9k), and this signal DS' is applied to the AND gate 64 of the envelope waveform generator 8'. , shift register 7
3. Input to inverter 76.

As a result, the envelope waveform generator 8' generates an envelope for the decay portion.

Therefore, the first glitsand sound effect is given a decay envelope in its second half (the 9th
Figure m).

In this case, when the envelope control waveform signal EW reaches the final value of the decay portion, the second determination circuit (FIG. 7) generates the decay end signal DF, and the glissand control unit 10 generates the decay end signal DF.
(Fig. 6), but in this state, both the signals DS and GF are "0", so the AND gate 54 is inactive, and this causes the AND gate 54 to signal the end of decay. Signal DF' is not generated.

Therefore, the Gritsando performance continues as it is and the second
The second Gritsand sound effect is generated.

On the other hand, when the decay start signal DS' disappears (the second
When the glissando sound effect starts to be generated), the signal CC' is outputted from the AND gate 75 (FIG. 7) as the signal DS' disappears (falls from '1' to t+111).

That is, the envelope start signal ES is 1'', the output of the inverter 76 is 1'' (since the signal DS' has become 0''), and the output of the shift register 73 is also 1'' (before the signal DS' has become 0''). 1'' is output), and the input condition of the AND gate 75 is satisfied.

The signal CC' output from the analog gate 175 is inverted via the OR gate 77 and the inverter 78, thereby disabling the AND gates 69a to 69f and transferring the signal to the corresponding channel of the shift register 66 (the channel where the signal CC' was generated). The content of the stage corresponding to the time) is 2.
10 Set to I+.

As a result, the attack end signal AF and decay end signal DF output from the first determination circuit 71 and the second determination circuit 72 become O''.

In this state, the envelope start signal ES is still being generated, so the AND gate 62 becomes operable and outputs the attack clock pulse ACP.

Therefore, the envelope waveform control signal EW for the attack portion is generated again from the envelope waveform generator 8', and an attack envelope is applied to the second glissando sound effect (FIG. 9m).

Then, in the second half of this second glitsand sound effect, as mentioned above, the decay start signal DS'
is generated (Fig. 9k), and along with this, the envelope control waveform signal EW of the decay part is generated from the envelope waveform generator 8', and a decay envelope is given to the second glitsand sound effect. .

Thereafter, the third, fourth, . . . glit sand sound effects to which attack and decay envelopes are applied are generated in the same manner (Fig. 9m).

As a result, each glish sand sound effect is generated sequentially in a staccato manner (FIG. 5d).

When the generation of the last (24th) glitsand sound effect ends, the envelope waveform generator 8' generates a decay end signal DF, and the glitsando control unit 10 generates a decay end signal DF.
The signal DF is input to the AND gate 54 (FIG. 6).

In this case, since the signals DS and GF are both n 1 n, the decay end signal DF is output from the AND gate 54.
' is generated and supplied to the key assigner 2'.

This ends the glissando performance.

Note that if the period of the attack clock pulse ACP in the envelope waveform generator 8' is short, the envelope of each glitsand sound effect shown in FIG. When the period of the clock pulse ACP is long, the envelope of each glissand sound effect transitions to a decay portion without completing the attack portion.

On the other hand, when the period of the decay clock pulse DCP is long, the attack part of the next glitsando sound effect starts before the decay part of the envelope of each glissando sound effect ends.

When the period of the decay clock pulse DCP becomes very long, each glissando sound effect takes on an envelope state similar to the legato mode described above.

In this way, when the cycle of the decay clock pulse DCP becomes longer, the envelope waveform generator 8' will no longer generate the decay end signal DF every time the generation of each glissando sound effect ends, and the signal DF will not be generated until the end of the generation of the last glissando sound effect. generated.

Also, in the above explanation, the state in which glitsando is performed is explained only for a certain channel, but this also applies to other channels, and if multiple keys are pressed simultaneously on the upper keyboard, multiple channels will be played. Gritsando performance as described above is performed independently.

Each mode in a glitsando performance has been described independently above, but in reality, each mode is combined to perform a glitsando performance.

Since this can be easily understood based on the above explanation, the explanation will be omitted.

In the above-mentioned embodiments, the present invention was only applied to an electronic musical instrument using a waveform memory reading method. However, the present invention is not limited to this, and This applies to all electronic musical instruments that use key information to control the pitch of musical tones.

Further, the present invention can be applied not only to multitone electronic musical instruments but also to single tone electronic musical instruments.

Furthermore, it goes without saying that the range of change in pitch due to glissando is not limited to the two octaves shown in the embodiment, but can be changed in various ways.

E. Effects of this invention As explained above, this invention encodes and extracts key information, and sequentially adds signals that determine the speed of gritsand from the start of key depression to generate the cumulative value. Applying arithmetic processing such as addition or subtraction to the encoded key information using the cumulative value whose value changes as a glitzand control signal to form key information that changes sequentially,
Since this key information is used to control the pitch of the generated musical tones, it is possible to automatically and extremely easily generate a glitsand sound effect in which the musical tones change sequentially, thereby enriching performance expression. Moreover, it has extremely excellent effects such as allowing even beginners to enjoy playing Gritsando extremely easily.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing an example of a conventional electronic musical instrument, Figure 2 is a block diagram showing an example of a conventional electronic musical instrument.
The figure is a waveform diagram of signals input and output to the key assigner shown in FIG. 1, FIG. 3 is a block diagram showing an embodiment of the electronic musical instrument according to the present invention, and FIG. FIG. 6 is a diagram showing the glitsando motion obtained by the invention using musical notes.
7 is a circuit diagram showing a specific example of the envelope waveform generator shown in FIG. 3, and FIG. 8 is a circuit diagram showing a specific example of the envelope waveform generator shown in FIG.
A waveform diagram showing the storage waveform of the memory shown in the figure, FIG.
8 and 8 are operation waveform diagrams of each part in FIG. 7. FIG. 1... Key switch circuit, 2'... Key assigner, 3'... Frequency information memory, 4...
...Accumulator, 5 ... Waveform memory, 6 ... Multiplier, 7 ... Sound system, 8' ... Envelope waveform generator, 10
... Gritsand control section, 10a ...
Gritsand switch, 10b...Repeat switch, 10c...Truncate switch, 1
0d...Up switch, 10e...
Chop switch 20.23.58... Adder.

Claims (1)

[Scope of Claims] 1. A key information generating means that is composed of a binary code in which one unit is a semitone, and that generates key information representing a note selected by a pressed key, and a periodic signal that determines the rate of pitch change in gris sando performance. a control data forming means for forming and outputting glysand control data whose value changes sequentially by repeatedly adding the values until a predetermined value is reached in response to a key press; a calculation means for forming and outputting key information that changes sequentially in accordance with the glissand control data by adding or subtracting glissand control data output from the control data forming means; What is claimed is: 1. An electronic musical instrument characterized in that the electronic musical instrument is equipped with a musical tone forming means for forming a musical tone by changing the pitch, and generates a musical tone whose pitch changes sequentially over time.