JPH05143073A - Electronic musical instrument - Google Patents

Abstract

PURPOSE:To provide the electronic musical instrument equipped with a mode assignor that easily generates a desired musical sound again by detecting the key which is the closest to a released key and generating the musical sound corresponding to the detected key. CONSTITUTION:A key scan circuit detects key pressing/releasing operation by a player, i.e., the ON/OFF state of a key and sends the detected ON/OFF state to a CPU 13 together with the key number. The CPU 13 stores the ON/ OFF information on the key in a RAM 15 and also performs even a monoassignor function. A console panel 12, on the other hand, is provided with a performance mode switch for monophonic/polyphonic switching. Then the state of key depression release at specific key scanning timing is stored as a keying map and if a key in sound generation (mispressed key) is released, the key which is the closest to the released key and being depressed is detected by referring to the keying map to generate the musical sound corresponding to the key again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic musical instrument such as a marching keyboard, and more particularly to an electronic musical instrument having improved operability when a sound is produced by a mono-assigner.

In recent years, various electronic musical instruments have been developed and put into practical use. In such an electronic musical instrument, there is often provided a mode in which a so-called mono-assigner is operated in which only a sound corresponding to one key is sounded even when a plurality of keys are pressed.

For example, in a normal mono-assigner prioritizing the last-arrival event, a sound corresponding to the key pressed last is sounded. Therefore, if the player mistakenly touches another key after pressing the target key, the target musical sound disappears, and the musical sound of the wrong key is produced.

In such a case, the player releases the wrong key, but in this case, it is desired to be able to re-produce the musical tone that should have been originally produced.

[0005]

2. Description of the Related Art Heretofore, there have been known several types of operation modes when a key which is mistakenly pressed in a mono-assigner of an electronic musical instrument is released.

The first method is a type of mono-assigner that does not re-pronounce. In this type of mono-assigner, when the wrong key is pressed while the target key is pressed, the musical sound of the target key disappears and the musical sound of the key pressed by mistake is pronounced. In this state, when the key that is pressed by mistake is released, only the musical sound that is erroneously sounded disappears. In this case, the target key is not sounded again even if it is pressed.

In such a mono-assigner, in order to generate a desired musical sound from the above state, it is necessary to release the target key once and then press the target key again. However, this operation has a drawback that it is very difficult for a beginner.

The second method is, for example, Japanese Patent Publication No. 61-384.
No. 77, Japanese Patent Publication No. 62-31355,
It is a type of mono-assigner that remembers the order in which it was pressed and the order in which it was forcibly muted, and re-pronounces a new one among them.

This type of mono-assigner has a drawback in that it requires a certain amount of memory because the sequence must be stored.

The third method is a mono-assigner that prioritizes treble or bass. In this, the highest note or the lowest note in the keys being pressed a plurality of times is selected and re-pronounced. However, this type of mono-assigner has a drawback in that it cannot be said that the probability of re-sounding a sound that should have been pronounced is sufficiently high.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. Even if a musical tone disappears because a key near the key to be pronounced is touched, the musical tone to be pronounced is desired. It is an object of the present invention to provide an electronic musical instrument equipped with a mono-assigner that can easily re-pronounce.

[0012]

The electronic musical instrument of the present invention comprises:
In an electronic musical instrument that emits only a musical sound corresponding to one of the pressed keys, a storage means that stores whether all keys are being pressed or released and a key that is emitting sound are released. Corresponding to the detection means for detecting the key closest to the released key among the keys being depressed when stored in the storage means, and the key detected by the detection means. It is characterized in that it is provided with a sound producing means for producing a musical sound.

[0013]

According to the present invention, in an electronic musical instrument which produces only a musical tone corresponding to one of the depressed keys, if the key is mistakenly depressed, it may be a key in the vicinity of the key to be produced. It was made paying attention to the characteristic that there are many.
That is, the state of key depression or key release at a certain point of time is stored in the storage means, and when the key being sounded (key pressed by mistake) is released, the storage means is referred to. Thus, the pressed key closest to the released key is detected, and the musical sound corresponding to the key is reproduced.

With this, it is not necessary to re-execute the operations of releasing and pressing the keys in order to reproduce the sound again. Therefore, the operation is simplified, and the sound which should be originally generated is reproduced with a high probability. It has become possible.

[0015]

1 is a block diagram schematically showing the overall structure of an electronic musical instrument having a mono-assigner according to the present invention.

In the figure, reference numeral 11 is a keyboard for instructing the pitch of a musical tone during a performance. The keyboard 11 includes a plurality of keys, a key switch that opens and closes in conjunction with key press / release of these keys, a key scan circuit that detects the open / closed state of these key switches, and a touch detection circuit ( Neither is shown).

The key scan circuit detects a key pressing operation and a key releasing operation of the performer, that is, a key on / off operation, and detects the detected on / off operation.
The OFF state is transmitted to the CPU 13 together with the key number. The CPU 13 sends this key on / off information to the RA
Store in M15.

The touch detection circuit is a well-known circuit that detects the strength (speed) of the key touch of the turned-on key detected by the key scan circuit and outputs it as touch data.

An operation panel 12 includes various switches such as a tone color selection switch, an effect selection switch, and a volume control lever. Further, the operation panel 12 is provided with a performance mode switch for switching monophonic / polyphonic which is directly related to the features of the present invention.

The present invention relates only to the case of operating in the monophonic mode.

The setting state of each switch mounted on the operation panel 12 is detected by a panel scan circuit included in the operation panel 12. This operation panel 12
The data related to the setting states of the switches detected by the panel scan circuit of 1 is stored in the RAM 15 under the control of the CPU 13.

Operation panel 1 stored in the RAM 15
The data regarding the setting state of the switch of 2 is
In addition, it is referred to by the CPU 13 or the like as necessary.

A central processing unit (CPU) 13 controls each section of the electronic musical instrument according to a control program stored in a program memory section of a read only memory (ROM) 14. The mono-assigner function which is a feature of the present invention is also realized by the CPU 13 (details will be described later).

The ROM 14 stores various fixed data such as tone color data, automatic performance data and the like, in addition to the program for operating the CPU 13 described above.

15 is a random access memory (RAM)
Is. The RAM 15 is allocated with a work area used by the CPU 13, a register for storing status information, control information, and the like.

The RAM 15 also has an area for storing the key depression map for storing the on / off state of the keyboard 11 and the set state of various switches on the operation panel 12. The key depression map has a storage area of 1 bit (or 1 byte) corresponding to each key of the keyboard 11,
The ON / OFF state of all keys at the scan timing is stored.

Reference numeral 16 denotes a tone generation circuit, which reads tone waveform data corresponding to a designated tone color from a waveform memory (not shown) in accordance with control information supplied from the CPU 13 and generates an envelope corresponding to the tone color or volume. Then, an envelope is added to the previously read musical tone waveform data and output as a digital musical tone signal.

The tone generating circuit 16 outputs a digital tone signal (Lch) for the left channel and a digital tone signal (Rch) for the right channel, each of which is D / A.
It is sent to the converter 17.

The D / A converter 17 converts the input digital tone signals for both left and right channels into analog tone signals. The analog tone signals for the left and right channels converted by the D / A converter 17 are supplied to the amplifiers 18a and 18b, respectively.

The amplifiers 18a and 18b amplify the input left and right channel analog tone signals with a predetermined gain and supply them to the left channel speaker 19a and the right channel speaker 19b.

The speakers 19a and 19b convert the input analog musical tone signal as an electric signal into an acoustic signal. That is, the musical tone is emitted according to the generated musical tone signal.

The keyboard 11, the operation panel 12, C
PU13, ROM14, RAM15 and tone generation circuit 1
6 are connected to each other via a system bus 30.

Next, the operation of the embodiment of the present invention having the above structure will be described with reference to the flow charts of FIGS. In the following description, it is assumed that the performance mode is set to the monophonic mode by the changeover switch of the operation panel 12.

When the power is turned on, first, the main routine shown in FIG. 2 is started. Then, the initial setting process is executed (step S10).

The contents of this initialization process are shown in the flowchart of FIG. That is, first, the key depression map is cleared to zero (step S20). This key depression map is provided in a predetermined area of the RAM 15 as described above.
The key on / off state is stored for each key.

Next, the sounding flag is reset (step S21). The sounding flag is a flag provided in the RAM 15, and is set when a key is pressed and reset when a key is released.

In this initialization process, in addition to the above processes, initialization of various hardware and initialization of various registers and flags provided in the RAM 15 are performed. Then, this initialization process is terminated and the process returns to the main routine.

Then, it is checked whether or not there is a key event (step S11). This is because the CPU 13 compares the data obtained by scanning the keyboard 11 this time with the data obtained by scanning the keyboard 11 the previous time, which is already stored in the RAM 15.
This is done by checking if there are any changes.

When it is determined that there is no key event, the process loops in step S11 and waits until there is a key event.

On the other hand, when it is determined that there is a key event, it is checked whether or not the key event is key depression (step S12). When it is determined that the key is pressed, the key-depression map creation process is executed (step S
13). That is, the bit corresponding to the depressed key in the key depression map area provided in the RAM 15 is set to "1".

Next, it is checked whether or not the sound is being produced (step S14). This is done by checking if the sounding flag is set.

When it is determined that the sound is being generated, the mute processing is performed (step S15). This muffling processing is performed by the CPU 13 supplying predetermined data to the tone generating circuit 16. On the other hand, if it is determined that the sound is not being generated, this step S15 is skipped.

This mute processing is performed in order to forcibly mute the tone being sounded in order to realize a monophonic mode in which only one tone is sounded at the same time.

Next, the tone generation key number storage process is performed (step S16). That is, the key number of the depressed key of the keyboard 11 is stored in the key number storage area of the RAM 15. Then, a sounding flag is set (step S
17).

Next, a tone generation process is performed (step S18). This tone generation processing is performed by the CPU 13 sending a key number, a tone color number and other predetermined information to the tone generation circuit 16. Then, return to step S11,
Hereinafter, similar processing is repeatedly executed.

By the above processing, the tone generation at the time of key depression in the monophonic mode is realized.

When it is determined in step S12 that the key is not depressed, that is, the key is released, the key depression map creating process is executed (step S19). The key depression map creation process performed here is a process of resetting the bit corresponding to the depressed key in the key depression map area provided in the RAM 15 to "0".

Next, it is checked whether or not the released key number matches the key number stored in the key number storage area of the RAM 15 (step S20). That is, it is checked whether or not the released key is the key currently being sounded.

When it is determined that they do not match, the process returns to step S11, and the above-described processing is repeated. This is an operation when a pressed key other than the sounding key is released. In this case, since the operation is in the monophonic mode, all the keys other than the key being sounded have already been forcibly muted in step S15. Therefore, the process returns to step S11 without performing any special processing.

On the other hand, when it is determined that the released key number matches the key number stored in the key number storage area, the mute processing is executed (step S21). This muffling process is performed by the same method as the process of step S15.

Next, the sounding flag is reset (step S22), and the re-sounding process directly related to the features of the present invention is performed (step S23).

The detailed operation of this re-sounding process is shown in the flowchart of FIG.

In this re-sounding process, first, a process of setting an initial value "1" in the counter is performed (step S30).

Then, the counter value is added to the released key number to obtain a temporary key number (step S31). And
It is checked whether or not this temporary key number is out of the key range (step S32).

Here, the key range is a range in which a key of the keyboard 11 of the electronic musical instrument exists, and is defined by an upper limit and a lower limit. Therefore, in step S32, it is checked whether the temporary key number exceeds the upper limit.

When it is determined that the key is not out of the key range, it is checked whether or not the key having the temporary key number is being pressed (step S33). This is done by looking up the key depression map in RAM 15. When it is determined that the button is not being pressed, the process proceeds to step S34.

On the other hand, if it is determined in the above step S32 that the key is out of the key range, it means that there is no key corresponding to the keyboard 11, so the process for checking whether or not the key is being pressed (step S33) is skipped. And step S3
Go to 4.

In step S34, the counter value is subtracted from the released key number to obtain the temporary key number. Then, it is checked whether or not this temporary key number is out of the key range (step S3).
4). Here, it is checked whether the temporary key number has exceeded the lower limit.

When it is determined that the key is not out of the key range, it is checked whether or not the key with the temporary key number is being pressed (step S36). This is also performed by checking the key depression map in the RAM 15. When it is determined that the button is not being pressed, the process proceeds to step S37.

On the other hand, if it is determined in the above step S35 that the key is out of the key range, it means that there is no key corresponding to the keyboard 11, so the process for checking whether or not the key is being pressed (step S36) is skipped. And step S3
Proceed to 7.

In step S37, the counter value is incremented. Then, it is checked whether or not the incremented counter value exceeds the number of keys of the keyboard 11 (step S38). Then, when it is determined that the number has not exceeded, the process returns to step S31, and the same processing is repeatedly executed again.

The above series of processes (steps S31 to S3)
According to 8), when a certain key is released, it is checked whether the key adjacent to the upper side of the key is being pressed, and if it is not being pressed, the key adjacent to the lower side of the key is checked. Check whether or not is being pressed, and if this is also not being pressed,
Then, it is checked whether or not the upper-ranking key is being pressed, and the like, and so on.

Then, in the process of repeatedly executing steps S31 to S38, in step S33 or S36,
If it is determined that the key is being pressed, that is, if the key being pressed is found, the pronunciation key number is stored (step S39). That is, the key number of the depressed key of the keyboard 11 is stored in the key number storage area of the RAM 15. Next, the sounding flag is set (step S
40).

Next, a tone generation process is performed (step S41). This tone generation process is the same as the tone generation process performed in step S18 of the main routine. Then, the process returns from this re-sound generation processing routine.

By the above processing, when a certain key being sounded is released, the tone of the key being pressed closest to the key is sounded.

When it is determined in step S38 that the counter value has exceeded the number of keys of the keyboard 11 in the repeated execution of steps S31 to S38, there is no key being pressed in the key range. Is recognized, the routine returns from the re-pronunciation processing routine without re-pronuncing. Therefore, in this case, the mute associated with the normal key release is performed.

As described above, according to this embodiment, the state of key depression or key release at a predetermined key scanning timing is stored as a key depression map, and a key being sounded (a key which is erroneously depressed is pressed). ) Is released, the pressed key closest to the released key is detected by referring to the key depression map, and the musical tone corresponding to the key is reproduced. It is not necessary to re-execute the operation of key release / key depression to re-produce the sound, and the operation becomes simple. Further, according to this embodiment, it is possible to re-pronounce a sound that should have been pronounced with a high probability.

[0068]

As described above in detail, according to the present invention, even if a musical tone disappears because a key near the key to be pronounced is touched, the musical tone to be pronounced can be easily reproduced. An electronic musical instrument equipped with a mono-assigner can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram schematically showing an overall configuration of an embodiment of an electronic musical instrument to which the present invention is applied.

FIG. 2 is a main flowchart showing the operation of the embodiment of the present invention.

FIG. 3 is a flowchart showing an initial setting process according to an embodiment of the present invention.

FIG. 4 is a flowchart showing a re-pronunciation process according to an embodiment of the present invention.

[Explanation of symbols]

 11 keyboard 12 operation panel 13 CPU 14 ROM 15 RAM 16 tone generation circuit 17 D / A converter 18a, 18b amplifier 19a, 19b speaker

Claims (1)

[Claims] 1. An electronic musical instrument which produces only a musical sound corresponding to one of the depressed keys, and a storage means for storing all keys indicating whether the key is being depressed or released. When the inner key is released, the detecting means for detecting the key closest to the released key among the depressed keys stored in the storage means, and the detecting means for detecting the detected key by the detecting means. An electronic musical instrument characterized by comprising a sounding means for generating a musical sound corresponding to the key.