JPH0695675A - Musical sound generation unit - Google Patents

Abstract

PURPOSE:To specify a key range and generate a musical sound signal by deciding key information from an external musical instrument on the basis of a set key range and supplying the key information to a musical sound signal generating means according to the decision result. CONSTITUTION:A CPU 38 inputs '1' to a flag register, and judges which of the with-low and with-high specification ranges of the area of a tone 1 in a work memory 39 a scale code is in and which of the key-touch low and key- touch high ranges of the area of the tone 1 in the work memory 39 input key- touch information is in, thereby starting generating a musical sound. The CPU 38 supplies a general start position, etc., from the area of the work memory 39 to unused channels of waveform read/write control parts 40-0 to 40-3 and pitch information to waveform read/write control parts 40-0 to 40-3 of specified channels. Their signals are supplied to sample holding circuits 44-0 to 44-3 and VCAs 45-0 to 45-3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a musical tone generating unit mainly used in the field of electronic musical instruments.

[0002]

2. Description of the Related Art Conventionally, there has been known a musical tone generating unit which is connected to a keyboard electronic musical instrument and generates a musical tone signal in response to a key depression in this electronic musical instrument (see Japanese Utility Model Laid-Open No. 56-3587). This musical tone generation unit generates musical tone signals based on the key information output from the electronic musical instrument, and is produced and sold independently of the electronic musical instrument to make the performer heavier or richer. Used to

[0003]

By the way, the conventional tone generating unit of this kind is designed to generate a tone signal in response to the depression of all keys of the electronic musical instrument. Since it is not possible to generate a musical tone signal corresponding to only a part of the key range, there is a drawback that the degree of freedom in playing is low. Therefore, an object of the present invention is to provide a musical tone generating unit capable of generating a musical tone signal by designating a key range.

[0004]

According to the present invention, a key range setting means for setting a key range and key information supplied from an external electronic musical instrument based on the key range set by the key range setting means. It is provided with a discriminating means for discriminating whether or not to supply to the musical tone signal generating means, and means for supplying the key information to the musical tone signal generating means according to the discrimination result in the discriminating means.

[0005]

EXAMPLE An example of the present invention will be described in detail below. FIG. 1 shows a circuit configuration of the present embodiment. In FIG. 1, reference numeral 1 denotes an operation switch panel portion, which is provided with various switches, an input terminal and a display device. And from the outside,
External sound is converted into a voltage signal by a microphone, input, and given to the MIC IN terminal.
On the contrary, from the device of this embodiment, a scale tone signal (acoustic signal) is output to the outside through an output (OUTPUT) terminal.

Further, as will be described later, a command signal (trigger signal) externally instructing to start recording a signal input through the microphone in terminal is triggered in (TRI).
GIN) terminal. Furthermore, Midi (MID
I) A keyboard signal or a control signal or data from a personal computer or the like is supplied through the IN terminal. It should be noted that MIDI is Musica, which is a unified standard of an interface for connecting electronic musical instruments or for connecting a personal computer and an electronic musical instrument.
l Instrument Digital Inte
It is an abbreviation for rface.

Details of the operation switch panel portion 1 of FIG. 1 are shown in FIG. That is, in FIG. 2, reference numeral 2 is
The power on / off switch makes the apparatus of this embodiment operable.

Then, in the record section, the microphone-in terminal 3 and the trigger-in terminal 4 are provided.
Is provided, and the signal level volume 5 that adjusts the level of the signal input from the microphone-in terminal 3,
It has a trigger level volume 6 for determining the level (trigger level) at which recording of an external signal supplied from the microphone-in terminal 3 is automatically started, and the signal level is displayed by a level meter 7. The level meter 7 displays the signal level by displaying a bar graph with an LED, for example.

Further, in the record section, a record (REC) switch 8 for shifting to the record mode and a clear (CL) for clearing a signal already recorded.
R) switch 9, a trigger (TRIG) switch 10 for a performer to manually input a trigger signal, and a cut (CUT) switch 11 for erasing unnecessary portions of a recorded signal. Have LEDs 8-1 to 11-1 which respectively indicate the operating state by lighting.

The console of the operation switch panel unit 1 (C
The ONSOLE section has a tone set switch 12 which is operated to distinguish each of a plurality of sounds recorded in one recording memory, as will be described later, and the tone number thereof has a letter segment. It is displayed on the tone LED 13, and the length of the position of the area is displayed on the tone map LED 14 as a bar graph. For example, the tone map LED 14 is divided into a number corresponding to the number of blocks of a recording memory described later. Each time the tone set switch 12 is operated, the tone number increases, for example.

Further, this console section has a fine (FI) used for inputting various parameters.
It has a NE switch 15 and a course (COARSE) volume 16, and by its operation, a VALUE LED 17 having a 4-digit day segment.
Alternatively, the display state of the tone map LED 14 described above changes.

The fine switches 15 and 15 are used to instruct a minute change by a single operation. The fine switches 15 and 15 are switched from a switch (→) for instructing a direction in which the parameter increases and a switch (←) for instructing a direction in which the parameter decreases. Become. Further, if these switches 15 and 15 are continuously pressed, the value continuously changes. The course volume 16 is used when the parameters are changed greatly.

The edit wave (EDIT WAVE) section of the operation switch panel has a plurality of switches for inputting signals which mainly specify how to use or modify the input and stored waveform signals, The master tune (MASTER TUNE) switch 18 changes the pitch (frequency) of the entire sound.
After D18-1 is turned on, the fine switch 1
5, 15 and the course volume 16 are used to determine the actual frequency, and the display at that time is the value LE.
At D17, for example, a value corresponding to the frequency is digitally displayed and tuning is performed.

In addition, tone pitch (TONE PITC
The H) switch 19 is effective when a plurality of tones (tones) are recorded, and determines the pitch for each tone.
The operation method is the same as that of the master tune switch 18, and when the LED 19-1 is turned on, the fine switches 15 and 15 and the course volume 16 are used.

General (GEN) start switch 20 and end switch 2 of the edit wave section
1 designates a start address and an end address of a waveform generated as a musical sound.
Fine switch 1 when -1 is in the lighting state
The tone map LED 14 and the value LED 17 are used for displaying using 5, 15 and the course volume 16.

A repeat (REP) start switch 22 and an end switch 23 are used to specify a start address and an end address of a repeated portion for repeatedly reading out a part of the stored waveform.
When 1 and 2 3-1 are in the lighting state, the fine switches 15 and 15 and the course volume 16 are used.
The display is a tone map LED 14 and a value LED
It will take place at 17.

The vibrato speed, depth (DEPTH), and delay switches 24, 25, and 26 of the edit wave section determine the speed and depth of vibrato, and the time or presence of delay, and are operated. And LEDs 24-1, 25-1, 26-
1 lights up, and in that state, the fine switches 15 and 15 and the course volume 16 are operated to input each parameter. At this time, the value is numerically displayed by the value LED 17.

Further, in this embodiment, an envelope different from the envelope which it has can be added to the prerecorded waveform, and the attack (A) time, delay (D) time, and sustain (S) of the envelope can be added. ) When each of the switches 27, 28, 29, 30 for setting the mode for inputting the level and the relieve (R) time is operated, the built-in LEDs 27-1, 28-
1, 29-1 and 30-1 are turned on, and the fine switch 1
By using 5, 15 and the course volume 16, each parameter can be digitally input. At that time, the value of each parameter is displayed on the value LED 17.

Further, in this embodiment, the relationship between the keyboard of the connected keyboard musical instrument and the output musical tone can be variably set, and the center (CENTER) switch 31 is
Determine which position (note scale) on the keyboard the recorded external sound should correspond to, and select the WIDTH switch 3
2 determines the sound generation area of the sound on the keyboard, and the touch (TOUCH) switch 33 determines the sound generation range of the sound according to the key touch (speed). Is operated, the LED 31-
1, 32-1 and 33-1 are lit, and in this lit state, the fine switches 15 and 15 and the course volume 16 are used.

That is, when the center switch 31 is operated, the fine switches 15, 15 and the course volume 1
By the operation of 6, the scale name to be associated is the value LED1.
Numerical value is displayed on 7, and when the with switch 32 is operated,
The upper and lower limits of the scale to which the sound is assigned are, for example, the value L.
4 in the ED17, such as H *** or L ***
It is made by displaying digits. The input switching between the upper limit and the lower limit is performed by continuously operating the with switch 32.

When the touch switch 33 is operated, the upper and lower limits of the key touch to which the sound is assigned are determined by operating the fine switches 15 and 15 and the course volume 16, and the above value is set as H *** or L ***. The input level is displayed on the LED 17. The input switching between the upper limit and the lower limit is performed by continuously operating the touch switch 33.

In the midi section of the operation switch panel section 1, there is a play switch 34, and the LED 34-1 provided internally by this operation is lit, and a keyboard signal input from the outside via the above-mentioned midi-in terminal 35. Perform according to touch data.

The check switch 36 is a tone LE.
The sound displayed on D13 is automatically pronounced, and you can hear how it was input and stored.
36-1 is displayed.

From the output terminal 37, when the play switch 34 is operated or the check switch 36 is operated, an output scale tone signal is sent to an external amplifier or speaker.

The operation switch panel section 1 is
As shown in FIG. 1, it is connected to the CPU 38 via a bus line ABUS. The CPU 38 is composed of a microprocessor and executes various processing controls described later.

The CPU 38 is connected via a bus line BBUS to a work memory 39 having a memory area used for various processing controls. Also, CPU3
8 channels 4 (CH0 through the bus line CBUS
To CH3) waveform read / write controller 40-0 to 40
-3 is connected. The four-channel waveform read / write control units 40-0 to 40-3 may have separate hardware, or may operate four channels by time division processing.

Then, the waveform read / read of these 4 channels
The write control units 40-0 to 40-3 include the recording memory 41.
, The address signal (ADDRESS) is time-divisionally applied via the bus line DBUS, and data (DATA) is exchanged with the recording memory 41 via the bus line EBUS. Further, the read / write signal (R / W) is output to the recording memory 41 in a time division manner.

Therefore, the waveform read / write controller 40-
0 to 40-3 can send different address signals to the recording memory 41 to access the waveform information of the same area or different areas, and write the waveform information in one channel to another. It is also possible to read out the waveform information on the channel.

The recording memory 41 has a memory of, for example, 1.5 mega (M) bits and can be divided into 32 blocks for use. Digitally stores a waveform signal, for example, PCM. It can be recorded.

Then, the external sound signal input through the microphone-in terminal 3 of the operation switch panel section 1 is sampled and given to the A / D converter 42, which converts it into a digital signal. To the waveform read / write control units 40-0 to 40-3 (actually, the waveform read / write control units 40-0 and 40-1 corresponding to channels CH0 and CH1 as described later) for recording. Memory 4
1 in the area of the appropriate address.

Further, the waveform read / write controller 40-0.
The digital signals read out and output from the recording memory 41 at ~ 40-3 are time-divisionally given to the D / A converter 43, converted into analog signals, and then sample-hold (S & H) circuit 44-. 0 to 44-3. That is, the sample hold circuits 44-0 to 44-3 are
The waveform signals output from the respective waveform read / write control units 40-0 to 40-3 in time division and for each channel are sampled and held.

Then, each sample hold circuit 44-0
The output of ~ 44-3 is VCA45-0 ~ 45-3.
Amplitude envelope control is performed, and mixing (MIX
ING) circuit 46. That is, VCA45-0
45 to 45-3 perform envelope control by converting the envelope control signal supplied from the CPU 38 into a voltage signal by the D / A converter 47 and supplying the voltage signal. In addition,
This D / A converter 47 has four VCAs 45-
It is arranged corresponding to 0 to 45-3.

The signal mixed by the mixing circuit 46 is output through the output terminal 37 of the operation switch panel section 1.

Next, the operation of this embodiment will be described. First, the operation in the record mode will be described.

<Record Mode> An external sound signal can be input from the microphone-in terminal 3, the record switch 8 is operated, and a record preparation state is entered. That is, in the record preparation state, as shown in FIG. 3, the external sound signal is repeatedly input and recorded in the final block (area D to E in the drawing) of the recording memory 41 until the trigger signal is actually applied. Record the external sound signal between. The area from D to E will be referred to as a delay trigger area. Then, when this record mode is entered, the LED 8-1 is turned on.

In this state, recording is actually started when a trigger is applied. There are three ways to apply this trigger, one is auto trigger (Auto Trigger).
This is called r) and a trigger signal is generated when the external sound signal exceeds the reference level set by the trigger level volume 6. The second one is operated by an external trigger signal input through the trigger-in terminal 4, and the third one is operated by the operator himself.
A trigger signal is generated by operating 0. The second method is called an external trigger (External Trigger), and the third method is a manual trigger (MamualTrigger).
r). The first trigger method and the other trigger methods are, for example, the trigger level volume 6
In addition, a range to which an auto trigger is not added is provided, and when the trigger level volume 6 is located at such a position, only the second and third trigger systems are adopted.

When a trigger signal is generated by any of the three trigger methods described above, the LED1
0-1 lights up.

Now, the operation of the CPU 38 in this record mode will be described with reference to FIG.

First, when the record switch 8 is operated, the process proceeds to step S1 and the CPU 38 causes the channel C
In the waveform read / write controller 40-0 of H0, the address D of FIG. 3 is set as the recording start address, the address D is set as the loop start address, and the address E is set as the loop end address. ,
Set the loop on state. That is, waveform lead /
Write control unit 40-0 (waveform read / write of other channel
The write control units 40-1 to 40-3 are also capable of repeatedly reading / writing a specific address area of the recording memory 41, and in the loop-on state, repeatedly address from the loop start address to the loop end address. become.

Then, in step S2, a command is given to the waveform read / write controller 40-0 of the channel CH0 via the bus line CBUS to start recording. Therefore, after the external sound signal input through the microphone-in terminal 3 is sampled, it is converted into a digital signal by the A / D converter 42 and sequentially recorded in the recording memory 4 described above.
Will be written to 1. FIG. 5A shows this state, and the external sound signal is repeatedly recorded in the delay trigger area (area from address D to E). When repeatedly recorded in the same area, the signal previously stored is erased and only the latest input signal is recorded. For example, this delay trigger area has 100
External sound signal of msec is recorded. By recording the external sound signal in advance in this delay trigger area,
The actual start of the recording after this becomes natural.

Next, in step S3, the channel CH
For the waveform read / write control unit 40-1 of No. 1, the address B shown in FIG. 3 is set as the recording start address, and the address C is set as the recording end address. Of course,
This recording start address and recording end address can be variably set.

Then, in step S4, it is judged whether or not the trigger signal is input by any one of the above-mentioned auto trigger, external trigger, and manual trigger, and when a judgment of No is made, this judgment is made. Step S4 is repeatedly executed, and if a trigger signal is input, a Yes determination is made and the process proceeds to the next step S5.

In this step S5, the channel CH0
Recording is stopped by the waveform read / write controller 40-0. For example, address advancement is stopped at the position indicated by CH0 in FIG. 5 (A).

Then, the channel CH1 waveform read /
A command to start recording is sent to the write control unit 40-1 via the bus line CBUS. Then, in the present case, recording is started from the address B in FIG. Then, in step S6, the waveform read / write controller 4
In the present case, it is judged whether or not the address designation of 0-1 is made up to the position of FIG. 3C, and if No, step S6 is repeated.

That is, in step S7, as shown in FIG.
As shown in (B), the data in the delay trigger area is transferred to a predetermined area of the work memory 39. in this case,
Since the data in the areas D to F in the figure are recorded before the data in the areas A to C, the data D to F are transferred first, and then the data A to C are transferred. Then, the order of the array is changed, and thereafter, in the state shown in FIG. 5C, recording is performed in the first block of the recording memory 41, that is, areas A to B. As a result, the external sound signal is digitally recorded in the areas A to C in the recording memory 41.

Then, in order to cut an unnecessary portion of the data recorded in this way, the cut switch 11 is operated and the fine switch 15 or the course volume 16 is operated while the LED 11-1 is in a lighting state. The tone map LED 14 displays the memory position and length of the sound, the display state changes each time the cutting operation is performed, and the storage area is displayed.

In the above description, the signal of one sound is input to the recording memory 41, but the tone number can be switched by the tone set switch 12 to continuously input different sounds.

That is, at this time, the CPU 38 records the waveform read / write control units 40-0 and 40-1 by appropriately designating the recording start address and the recording end address. In this way, tones 1 to 5
FIG. 6 shows a state in which the waveform information of is stored. Each time the tone set switch 12 is operated, the tone number changes, and the tone LED 13 displays a numerical value and the tone map LED 14 displays the storage area of the sound.

If the clear switch 9 is operated,
The waveform information of the numbers displayed on the tone LED 13 and the subsequent numbers is erased. Therefore, for example, when the clear switch 9 is operated when "3" is displayed on the tone LED 13, tones 3 to 5 are erased from the recording memory 41, and a new external sound signal can be recorded. Like

The signal thus input is read out by the operation of the check switch 36, the CPU 38 instructs the waveform read / write control section 40-0 to be sequentially accessed, and is read out by D / A converter 4
3 is converted into an analog signal via VCA45-0, and is appropriately amplified by VCA45-0 before being output from the output terminal 37.
Is pronounced. Therefore, the recording state can be checked.

<Edit Wave Mode> Next, the operation of changing the input waveform signal in this manner to form a waveform signal for an actual output tone signal will be described.

FIG. 7 shows a state where related data for the external sound signal recorded in the recording memory 41 is stored in a specific address area of the work memory 39.

That is, each data is stored in the order of tone number. For example, in the area of tone 1, the following data is stored in the work memory 39 under the control of the CPU 38.

First, the start block number (STAR
T BLOCK #) specifies the first block where the tone 1 waveform is stored, and the end block number (END BLOCK #) specifies the last block where the tone 1 waveform is stored. The tone map LED 14 is displayed based on these two pieces of information.

Next data, ie, general start block number (GEN START BLOCK #)
Specifies the block address at which the actual pronunciation is started, and the next general start address (GEN ST
ART ADRS) specifies the lower address in the block. This value is set using the fine switches 15 and 15 and the course volume control 16 after the operation of the general start switch 20. FIG. 8 illustrates such a situation, where the general start position can be taken from anywhere in the tone N storage area.

Further, the next general end block number (GEN END BLOCK #) and the general end address (GEN END ADRS) are the fine switch 1 after the operation of the general end switch 21.
5, 15 and the course volume 16 are used for input.
FIG. 8 further shows that the position of the general end input in this way can be freely set.

The repeat start block number (REPSTART BLO) stored in the next area.
CK #), repeat start address (REP ST
ART ADRS) is a repeat start switch 22
After the operation of, the fine switches 15 and 15 and the course volume 16 are used to set, and the start position at the time of repeat for repeatedly accessing a specific area of the stored waveform information is designated. Similarly, repeat end block number (REP END BLOCK
#), Repeat end address (REP END AD
RS) is set by using the fine switches 15 and 15 and the course volume 16 after the repeat end switch 23 is operated, and specifies the end position of the specific area of the waveform information.

This state is as shown in FIG. 9, and at the time of actual performance, the general start (GEN)
Waveform read / write control units 40-0 to 40-3 from the (START) position to the repeat start position.
The waveform information is repeatedly accessed a predetermined number of times from the repeat start position to the repeat end position, and then the waveform information is accessed from the repeat end position to the general end position. The passage of the repeat end position may be made, for example, when the performance key of the keyboard is turned off. The operation of setting the general and repeat start addresses and the end address will be described later.

The tone pitch (TONE PITCH) stored in the work memory 39 shown in FIG. 7 is set by operating the fine switches 15 and 15 and the course volume 16 after the tone pitch switch 19 is operated. Reflecting the setting information by operating the tune switch 18, the pitch (PITCH) C # to
Frequency information of 12 scales of a specific octave of C is determined.

The keyboard center (KEY BOARD CENTER) of the work memory 39 is the fine switch 1 after the keyboard center switch 31 is operated.
5, 15 and the course volume 16 are set to determine which scale the recorded external sound signal is associated with. The correspondence is displayed numerically in the value RED17. The information of the pitches C # to C changes according to the setting of the keyboard center, and a transposing function can be provided.

That is, for example, when the frequency of the external sound signal is f1, the scale specified by the keyboard center has the frequency f1, and by changing the keyboard center, it is possible to variably set which scale has the frequency f1. You can

Then, according to the setting of the keyboard center, the contents of the pitches C # to C in FIG. 7 are rewritten, or the correspondence with the scale at which this information is actually read is changed to change each scale. Frequency is set.

Next keyboard with low (KEYBOA
RD WIDTH L) and keyboard with high (KE
YBOARD WIDTH H) is set by operating the keyboard with switch 32, the fine switches 15 and 15 and the course volume 16, and sets the use range of the sound corresponding to the scale sound. The keyboard center, the keyboard with low, and the high may be operated by operating the performance keys of the keyboard connected via the MIDI IN terminal 35.

Next, key touch low (KEY TOUCH
L) and key touch high (KEYTOUCH H) are set using the fine switches 15 and 15 and the course volume 16 after the key touch switch 33 is operated, and the range of use of the sound is key touch (speed).
Set according to. At this time, the value indicating the upper limit and the lower limit is displayed on the value LED 17.

Also, envelope attack, decay,
After operating the Sustain and Release switches 27 to 30, fine switches 15 and 15 and course volume 1
6 and 6 to use envelope attack (ATT), decay (DEC), sustain (S) of the work memory 39.
Information of US) and release (REL) are set.

Besides, although the vibrato information and the like are input to the memory area of the tone 1, the description thereof will be omitted.

Next, the operation of detecting the above-mentioned general start address, end address or repeat start address, end address will be described in detail.
That is, the waveform information is such that the level thereof changes with time as shown in FIG.
When you specify the end, a noise called click sound is output. Therefore, it is necessary to detect a so-called zero-cross point that passes through the zero level and use that address as the general start address, end address or repeat start address, end address.

FIG. 11 shows the processing, and the CPU 3
8 is the fine switch 15, 1 from the recording memory 41.
The waveform information is read according to the operation of 5 or the course volume 16, and the zero-cross point is detected.

FIG. 11 shows the flow when the address is moved to the increasing side. At step T1, the polarity flag is turned off, and then at step T2, the pointer in the CPU 38 (this is the recording memory 41). Address is designated and changes in synchronization with the address counter of the waveform read / write controller 40-0.) Is incremented.

Then, at step T3, it is judged whether or not the data of the address indicated by the pointer is a negative value, and if the judgment is Yes, the process proceeds to step T4 to turn on the polarity flag. The polarity flag is turned on when the amplitude value of the waveform takes a negative value, and turned off when it takes a positive value.

Then, following step T4, the operation proceeds to step T2, and the same operation is repeated. When the data designated by the pointer is positive, the determination in step T3 is No, and the process proceeds to step T5 to judge whether or not the polarity flag is in the on state.

Then, when the polarity flag is off, that is, when the positive amplitude value is continuously read, step T5
Is No, the process proceeds to step T6, and the polarity flag is turned off.

Step T5 makes a Yes determination when the amplitude value of the previous pointer is negative and the amplitude value of the pointer this time is positive, and when the zero cross point is just passed. is there.

At that time, the process of step T7 is executed after step T5. In step T7, it is judged whether or not the amplitude value data of the current pointer is equal to or smaller than the predetermined value Δ. That is, as shown in FIG. 10, in the vicinity of the zero-cross point of the waveform, it is determined Yes in step T5, but if the address point is not actually small, that is, if it is not smaller than the predetermined value Δ, a click sound is generated. Therefore, the meaning of the zero-cross point detection process becomes meaningless. Therefore, if No is determined in step T7, the processes of steps T1 to T6 are repeatedly executed until the next zero cross point. Then, when the determination of Yes is made in step T7, the series of processes is ended, and the CPU 38 writes in the work memory 39 the pointer value at that time as the general start address, end address or repeat start address, end address. Put in.

FIG. 11 shows the processing of the CPU 38 when the address changes in the positive direction. On the contrary, when the address changes in the negative direction, the polarity flag is set in step T1 'corresponding to step T1. Is turned on, and in step T3 ′ corresponding to step T3, it is judged whether or not the pointer data is correct, in step T4 ′ corresponding to step T4, the polarity flag is turned off, and in step T5 ′ corresponding to step T5. The polarity flag is turned off, the polarity flag is turned on in step T6 'corresponding to step T6, and the other steps T2 and
The process of T7 may be similarly performed.

<Play Mode> Next, the play switch 3
The operation in the play mode in which the player operates 4 to play in accordance with the signal input from the MIDI IN terminal 35 will be described below.

In the recording memory 41, for example, different waveform information of tones 1 to 4 is recorded, and as data of keyboard center, keyboard with low, high, key touch low, high of the work memory 39. It is assumed that the information as shown in FIG. 12 is input.

That is, in FIG. 12, tone 1 to tone 4
Each of the data is shown schematically, the keyboard center of tone 1 is C3 (subscript indicates octave number, the same applies below), keyboard width is C3 to B3,
The key touch is 0 to 127. Similarly, the keyboard center for tone 2 is C4 and the keyboard width is C3.
# ~ C6, key touch is 20 ~ 80, tone 3
Keyboard center is A5 and keyboard width is C
5 to B5, key touches are 81 to 127, tone 4 keyboard center is A4, keyboard width is F4 # to B4, and key touches are 0 to 120.

Then, according to step U1 of FIG.
The U38 inputs "1" into a flag register (hereinafter, this register is referred to as a tone number register) designating a tone number (TONE #), and then the step U
2 and the tone (NOTE) code input via the MIDI IN terminal 35 is the tone 1 of the work memory 39.
Judge whether it is within the range specified by with low and with high in the area.

Then, if a Yes determination is made in step U2, the process proceeds to step U3. Step U3
Then, the input key touch (KEY TOUCH) information input through the MIDI IN terminal 35 is stored in the work memory 3
Judge whether it is in the range of key touch low and key touch high in the area of tone 1 of 9.

Then, if a Yes determination is made in step U3, the process proceeds to step U4, and the tone designated by the tone number register (that is, tone 1 in this case).
Starts to sound according to the scale code and key touch information.

That is, the CPU 38 outputs the information designating the general start position and the end position, the information designating the repeat start position and the end position from the corresponding area of the work memory 39 to the waveform read / write control units 40-0 to 40-40.
-3 is given to the control unit of the unused channel. Also, the pitch information corresponding to the scale code is read from the work memory 39, converted appropriately according to the octave information, and given to the waveform read / write control units 40-0 to 40-3 of the designated channel.

As a result, the waveform read / write controller 40
-1 to 40-3 read the waveform information of the designated area from the recording memory 41 at a speed according to the pitch information and give it to the D / A converter 43.

The analog waveform signal output from the D / A converter 43 is the sample hold circuit 44-0.
44-3, and then VCA 45-0 to 45-
Given to 3. In this VCA45-0 to 45-3,
The CPU 38 reads the envelope attack, decay, sustain, and release data read from the work memory 39, and digital information that sequentially changes according to the input key touch information, by any one of the four D / A converters 47. Given after being converted to. Therefore, the VCAs 45-0 to 45-3 add a preset envelope and also control the volume according to the key touch.

The output signal is mixed by the mixing circuit 46 and output to the outside through the output terminal 37.

In step U4 of FIG. 13, the channel to be sounded, the scale and the key touch are designated in this way, and the process proceeds to step U5. It should be noted that, even when it is determined No in the above steps U2 and U3, the process proceeds to step U5.

Step U5 increments the contents of the tone number register. After this processing, the procedure proceeds to step U6, and the processing of steps U2 to U5 is completed for all tones, in this case tones 1 to 4. If it is judged whether it is No or not, step U2
Proceed to. Further, when the determination of Yes is made in step U6, the processing for the information input from the MIDI IN terminal 35 is completed. Therefore, when a plurality of keys are simultaneously operated on the keyboard, the CPU 38 executes the flow shown in FIG. 13 each time, and the different channels CH0 to
CH3 waveform read / write controller 40-0 to 40-3
The output musical sound is assigned to and generated. When a mute command is given from the midi-in terminal 35, the same processing is executed to stop the sound generation.

Therefore, in the case of the example shown in FIG.
For example, the information input from the MIDI IN terminal 35 is C3
If the key touch is 40, the tone 1 tone is
It is sounded at the level of key touch 40. Similarly, if the information input from the MIDI IN terminal 35 is A3 and the key touch is 40, two tones 1 and 2 are produced at the level of the key touch 40.

If the information input from the MIDI IN terminal 35 is C5 and the key touch is 100, the tone 3
However, if the scale is the same and the key touch is 60, tone 2
Is pronounced.

As described above, in the present embodiment, a plurality of waveform signals recorded in advance can be selectively used according to the range of the keyboard and the range of the key touch, and the conventional keyboard split function is further enhanced. It is also possible to switch tones by key touch.

[0091]

As described above, the tone generating unit according to the present invention can generate a tone signal by designating a key range, and as a result, the degree of freedom of playing can be greatly improved. Moreover, by sequentially purchasing the musical tone generating unit according to the present invention to an inexpensive keyboard electronic musical instrument,
A sophisticated electronic musical instrument system can be constructed in sequence.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of an embodiment.

FIG. 2 is a diagram showing an operation switch panel of FIG.

FIG. 3 is a diagram showing contents and addresses of a performance memory.

FIG. 4 is a diagram showing a flowchart illustrating an operation in a record mode.

FIG. 5 is a state diagram when changing an array state of data recorded in a delay trigger area.

FIG. 6 is a state diagram when a plurality of tones are stored in a performance memory.

FIG. 7 is a diagram showing a main part of the contents of the work memory of FIG.

FIG. 8 is a diagram for explaining a change in the positions of general start and end.

FIG. 9 is a diagram for explaining a repeat start, end change, and addressing order during play.

FIG. 10 is a diagram for explaining a zero-cross point of a waveform.

FIG. 11 is a diagram showing a flowchart for detecting a zero-cross point.

FIG. 12 is a diagram for explaining a keyboard and key touch allocation range of a plurality of tones.

FIG. 13 is a diagram showing a flowchart for explaining an operation in a play mode.

[Explanation of symbols]

 1 Operation switch panel section 3 Microphone in terminal 4 Trigger in terminal 8 Record switch 9 Clear switch 10 Trigger switch 11 Cut switch 12 Tone set switch 13 Tone LED 14 Tone map LED 15, 15 Fine switch 16 Course volume 17 Value LED 20 General start switch 21 General End Switch 22 Repeat Start Switch 23 Repeat End Switch 31 Keyboard Center Switch 32 Keyboard With Switch 33 Keyboard Touch Switch 34 Play Switch 35 Midi-In Terminal 36 Check Switch 37 Output Terminal 38 CPU 39 Work Memory 40-0-40-3 Waveform Read / write control unit 41 Recording memory 42 A / D converter 43 D / A converter 45-0 to 45-3 VCA

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Morokuma 3-2-1 Sakaemachi, Hamura-shi, Tokyo Casio Computer Co., Ltd. Hamura Technical Center

Claims (1)

[Claims] 1. A musical tone generating unit having musical tone signal generating means for generating a musical tone signal corresponding to key information supplied from the outside, and a key range setting means for setting a key range, and the key range setting means. Based on the set key range, a discriminating means for discriminating whether or not to supply the key information to the musical tone signal generating means, and the key information to the musical tone signal generating means according to the discrimination result in the discriminating means. A tone generation unit comprising a supply means.