JP3442232B2 - Electronic musical instrument - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to, for example, MIDI.
The present invention relates to an electronic musical instrument that emits sound based on a standardized signal including a device control signal, such as a (Musical Instrument Digital Interface) standard signal.

[0002]

2. Description of the Related Art For example, an electronic piano, an electronic organ, etc.
Electronic musical instruments equipped with a keyboard are designed to produce musical tones in response to keyboard operations, but the volume balance between timbres is taken into consideration for that musical tone, and it is also specified when the volume is maximized. Each instrument has its own volume setting so that it will not be distorted. That is, the electronic musical instrument is set so as to limit the original ability of the sound source so that the maximum volume can be obtained with a tone color balance suitable for the musical instrument.

In addition, the electronic musical instrument has a MIDI signal from the outside.
When a standard signal (hereinafter, simply referred to as a MIDI signal) is input or when commercially available song data stored in a floppy disk or the like is reproduced, a musical sound is generated based on the MIDI signal or the commercially available song data. Has been done.

That is, standardized signals such as MIDI signals and commercially available music data include various information such as information corresponding to key depression, key release and key touch, and maximum volume information. ing. Therefore, when such a standardized signal is input, the electronic musical instrument is designed to generate a musical tone based on various information contained in the signal. For example, the standardized signal When a larger volume value is designated, the tone generator circuit of the electronic musical instrument produces a musical sound with a volume larger than the volume during keyboard operation.

[0005]

However, in the conventional electronic musical instrument as described above, a standardized signal is input, and information on the maximum value of the volume included in the signal is
If the volume is higher than the preset volume of each instrument for each timbre, the generated musical tone may be distorted. That is, since the balance of the musical tone as an electronic musical instrument and the balance of the musical tone as a standardized signal are different, the above-mentioned electronic musical instrument may not be compatible with the sound source if it receives the standardized signal as it is, Sound distortion may occur. Due to such a problem, the conventional electronic musical instrument cannot improve the quality as a product.

Therefore, the present invention has been made in order to eliminate the above-mentioned drawbacks, and even when a musical tone is to be pronounced based on a standardized signal, there is a feeling of volume and good musical tone without distortion. The purpose of the present invention is to provide an electronic musical instrument with improved quality by pronouncing.

[0007]

The electronic musical instrument according to the present invention is based on a standardized signal including a device control signal,
An electronic musical instrument sounded by a sound source means, a storage means for storing a maximum volume value for each tone color, and a volume value of an arbitrary tone color indicated by the device control signal are stored in the arbitrary tone color stored in the storage means. And a control means for controlling the volume value of the arbitrary tone color produced by the sound source means on the basis of the determination result of the determination means. Characterize. Further, the control means determines that the volume value of the arbitrary tone color indicated by the device control signal exceeds the maximum volume value corresponding to the arbitrary tone color stored in the storage means according to the determination result of the determination means. In this case, the volume value of the arbitrary tone color produced by the sound source means is limited to the maximum volume value. Further, the storage means is characterized in that the maximum volume value for each tone range is stored for each tone color.

[0008]

According to the present invention, when a standardized signal including a device control signal is input, whether the volume value of the timbre indicated by the device control signal exceeds the maximum volume value stored in the storage means. The volume value at the time of sound generation is controlled according to the determination result of whether or not the sound is generated. As a result, the sound source means emits sound with the controlled volume value. Further, when the volume value of the timbre indicated by the device control signal exceeds the maximum volume value stored in the storage means, the volume value during sounding is controlled so as not to exceed the maximum volume value. As a result, the sound source means produces a sound with a volume value that does not exceed the maximum volume value. Also, the volume value at the time of sounding is controlled for each tone range of each tone color.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

The electronic musical instrument according to the present invention is applied to an electronic musical instrument 100 having a keyboard 109, for example, as shown in FIG.

As shown in FIG. 1, the electronic musical instrument 100 has a CPU (Central Processing Uni) and a MIDI interface circuit 102 connected by a bus 106.
t) 103, a ROM (Read Only Memory) 104,
A RAM (Ramdom Access Memory) 105 is provided, and an external sequencer 101 is connected to the MIDI interface circuit 102. In addition, the electronic musical instrument 10
0 is a floppy disk controller (FDC) 108 connected by a bus 106 and a touch detection circuit 11
0 and a tone generation circuit 112,
8 is a floppy disk driver (FDD) 107
The keyboard 109 is connected to the touch detection circuit 110, and the sound system 111 is connected to the tone generation circuit 112.

In the electronic musical instrument 100 as described above, the maximum value of the volume unique to the musical instrument is preset so that the maximum volume is output with a tone color balance suitable for the musical instrument.
Although the details will be described later, the maximum value of the volume that can be received by the standardized signal is also preset for each timbre.

Therefore, first, in the electronic musical instrument 100,
A case where the keyboard 109 is operated by operating the keyboard 109 will be described.

Although not shown, the keyboard 109 is composed of one or a plurality of keys including a plurality of keys and a key switch provided corresponding to each of the keys, and the touch detection circuit 110.
Scans each key on the keyboard 109 to determine the key press, key release, velocity related to key operation speed, etc.
The operation state of the keyboard 109 is detected.

Although not shown, the electronic musical instrument 100
In addition to operators for setting rhythm, tone color, volume, effects, etc., there is an operation panel section in which operators such as demo switches for instructing automatic performance based on preset automatic performance data are arranged. The operation state of the operation panel section is also detected.

The CPU 103 has note information corresponding to the operation state of the keyboard 109 detected by the touch detection circuit 110,
Also, parameter information such as rhythm and tone color corresponding to the operation of the operation panel section described above is supplied to the musical tone generating circuit 112.

Here, in the ROM 104, the CPU 103
Work program, PCM (PulseCode Modulation)
Musical tone waveform data (hereinafter referred to as sound source data) obtained by the method, automatic accompaniment data, and the like are stored. Further, the RAM 105 includes a working memory or the like that temporarily stores various kinds of information in the course of execution of various kinds of processing of the CPU 103, and stores information obtained as a result of various kinds of processing. Therefore, the CPU 103 determines that the RO
According to the program stored in M104, RA
Various processes such as the above-described processes and the processes described below are performed using M105.

The tone generation circuit 112 reads out sound source data from the ROM 104 based on the parameter information from the CPU 103, processes the amplitude and envelope of the data, and supplies it to the sound system 111.

When an automatic performance is instructed by the above-mentioned operation panel, the CPU 103 reads out the automatic accompaniment data corresponding to the operation from the ROM 104 and supplies it to the musical sound generating circuit 112.

The tone generation circuit 112 reads out from the ROM 104 sound source data such as chords, bass and drums corresponding to the automatic accompaniment data from the CPU 103, and supplies it to the sound system 111.

Although not shown, the sound system 111 is provided with an amplifier, a speaker and the like for producing a musical sound based on the sound source data from the musical sound generating circuit 112. Therefore, by supplying the sound source data as described above from the tone generation circuit 112 to the sound system 111, the sound system 111 outputs the sound source data within the optimum volume range preset in the electronic musical instrument 100 as described above. With the volume, a musical sound corresponding to the operation of the keyboard 109 is output, and an automatic accompaniment chord sound, bass sound, drum sound, etc. are output.

Next, in the electronic musical instrument 100, the MID
A case of operating based on a standardized signal such as an I signal will be described.

The external sequencer 101 is, for example, MID
It reproduces commercial song data of I standard and outputs MIDI data. MIDI data output from the external sequencer 101 is output by the MIDI interface circuit 102.
Input / output control to / from the electronic musical instrument 100 is performed.

On the other hand, in the FDD 107, for example, MID
A floppy disk on which I data is recorded is set, and the FDD 107 is controlled by the FDC 107, whereby MIDI data is reproduced from this floppy disk.

The MIDI data input by the external sequencer 101 or FDD 107 as described above includes
It contains a program change, which is information for switching tones. In addition, the MIDI data includes information on the maximum value of the volume value for each tone color switched according to the program change (hereinafter, referred to as MID.
I volume information).

Therefore, in the electronic musical instrument 100, the maximum volume value that does not exceed the volume setting of the musical instrument is set for each of the timbres that are switched according to the program change. The maximum value information (hereinafter referred to as MIDI volume restriction information) is stored in the ROM 104 in advance.

More specifically, for example, as shown in FIG. 2, in the electronic musical instrument 100, the M of the organ designated by the MIDI volume information of the input MIDI data is used.
IDI volume value "I _O ", trumpet MIDI
For each of the volume value “ _IT ” and the piano MIDI volume value “ _IP ”, the MIDI volume limit value “O”
_O "," O _T "," O _P "is set. That is, in the ROM 104, the MIDI volume values “I _O ” of the organ, trumpet, and piano to be input,
For each MIDI volume value of each timbre such as " _IT " and " _IP ", MIDI volume limit value " _OO ",
"O _T", "O _P", etc., timbre another MIDI volume limit is stored in advance as MIDI volume restrictions.

Therefore, as shown in FIG. 3, when the MIDI data is first input (step S1), the CPU 103 produces an MI for each tone color included in the MIDI data.
By referring to the DI volume information, it is determined for each timbre whether or not the volume value indicated by the MIDI volume information is greater than or equal to the MIDI volume limit value stored in the ROM 104. Then, the CPU 103
The volume value indicated by the DI volume information is R
Only for a tone color that is equal to or greater than the MIDI volume limit value stored in the OM 104, the volume value of the tone color is limited to the MIDI volume limit value stored in the ROM 104 (step S2), and a parameter corresponding to the volume limit is set. Is supplied to the tone generation circuit 112 (step S3).

As a result, the sound system 111 outputs a musical tone based on the input MIDI data with a volume that does not exceed the preset volume of the electronic musical instrument 100. For example, in FIG. 2 described above, the MIDI volume value “I _O ” of the input organ and the MIDI volume value “I _O ” of the trumpet are input.
_T ”, the MIDI volume value“ I _P ”of the piano is MI
DI volume limit _"O O", is limited to the "O _T", "O _P".

As described above, in the electronic musical instrument 100, the MI input by the external sequencer 101 or the FDD 107 is used.
Since the MIDI volume is limited to DI data, even if the input MIDI volume exceeds a preset volume, the sound is not distorted and the volume feeling is improved. It is possible to pronounce musical tones with optimum tone color balance without loss. Further, since the excessive volume can be limited to the amplifier and the speaker provided in the sound system 111 as described above, the distortion of the sound due to the clipping can be suppressed.

In the electronic musical instrument 100 described above, MIDI data is used as the data to which the volume is limited.
Not limited to this MIDI data, standardized data such as commercially available song data may be used.

Further, in the above-described electronic musical instrument 100, the sound volume is limited for each timbre, but the volume may be limited for each timbre of each timbre. In this case, the ROM 104
The MIDI volume limit value for each tone range is stored for each tone color.

[0033]

As described above, according to the present invention, the standard value including the device control signal is limited to the volume value indicated by the signal. Even when reproducing the converted signal, it is possible to produce a good musical sound without impairing the sense of volume and without causing distortion of the sound. Further, by limiting the volume value indicated by the device control signal equal to or greater than the maximum volume value stored in the storage means so as not to exceed the volume value set in the electronic musical instrument, You can get the maximum volume with the optimal tone balance that suits the instrument. Therefore, a better musical sound can be pronounced.
For example, the MIDI volume is limited to external MIDI input data or data recorded on a floppy disk, that is, the maximum volume value that can be received by MIDI is set for each timbre, and the MIDI volume that is equal to or greater than the set volume value is set. Is applied so that the volume setting of the musical instrument is not exceeded, the MIDI input data can be normally reproduced up to a certain volume. Further, for example, for a speaker or an amplifier for outputting a speaker, it is possible to limit excessive sound volume, and thus it is possible to suppress sound distortion due to clipping.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a configuration of an electronic musical instrument according to the present invention.

FIG. 2 is a diagram for explaining a relationship between a volume value for each timbre indicated by input MIDI data and a set maximum volume value for each timbre.

FIG. 3 is a flowchart showing an outline of processing for limiting the volume value for each timbre indicated by the input MIDI data to the set maximum volume value for each timbre.

[Explanation of symbols]

100 electronic musical instruments 101 External sequencer 102 MIDI interface circuit 103 CPU 104 ROM 105 RAM 106 bus 107 FDD 108 FDC 109 keyboard 110 Touch detection circuit 111 sound system 112 tone generation circuit

Claims (3)

(57) [Claims] 1. An electronic musical instrument produced by a sound source means on the basis of a standardized signal including an equipment control signal, a storage means for storing a maximum volume value for each timbre, and an arbitrary one indicated by the equipment control signal. Discriminating means for discriminating whether or not the volume value of the tone color exceeds the maximum volume value corresponding to the arbitrary tone color stored in the storage means, and based on the discrimination result of the discriminating means, An electronic musical instrument comprising: a control unit that controls a volume value of the arbitrary tone color to be emitted. 2. The control means determines that the volume value of an arbitrary timbre indicated by the device control signal is the maximum volume value corresponding to the arbitrary timbre stored in the storage means according to the discrimination result of the discrimination means. 2. The electronic musical instrument according to claim 1, wherein the volume value of the arbitrary tone color produced by the sound source means is limited to the maximum volume value when the sound volume exceeds the maximum volume value. 3. The electronic musical instrument according to claim 1, wherein the storage means stores a maximum volume value for each tone range for each tone color.