JPH0553583A - Electronic musical instrument equipped with sound volume control pedal - Google Patents

Abstract

PURPOSE:To improve the performance expressing ability without spoiling the operability by providing a low-frequency component reinforcing means which relatively reinforces the low-frequency component of a note generation signal at the time of low sound volume corresponding to the operation of the sound volume control pedal. CONSTITUTION:Sound signals corresponding to the right hand and left hand are supplied to a voltage control amplifier(VCA) 9. The VCA 9 controls the sound volume levels of the sound signals in response to a sound volume control signal generated by the sound volume control pedal 11. The outputs of buffer amplifiers 7 and 8 are supplied to a low-pass filter 10 as well and the low-frequency components of the outputs are passed through resistances R1 and R2 and added to the output of the VCA 9. The output level of the low-pass filter 10 is invariably constant irrelevantly to the operation of the sound volume control pedal 11. Therefore, when low sound volume is set with the sound volume pedal, low-frequency reinforcement effect is remarkable and a deficiency in low frequency sound which is caused at this time can be compensated without using a manual operation means such as a loudness switch.

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 having a volume control pedal such as an electronic piano or an electronic keyboard.

[0002]

2. Description of the Related Art Generally, an electronic keyboard, an electronic piano, etc. are used together with a volume control knob or volume control button called a master volume on a panel, and a performance sound is produced by a volume control pedal called an expression pedal. The volume of can be increased or decreased. Also on the panel,
It is also known to provide an operating means such as a loudness switch, which relatively enhances bass at a low volume.

[0003]

The master volume is set as the average volume of the performance before the performance is started, and the expression pedal is operated at any time during the performance according to the contents expressed in the performance. Is. When the master volume is set to a low volume, turn on the loudness switch to make a setting that compensates for the unsatisfactory low-pitched sound. Also, when the master volume is set to a relatively high volume, turn off the loudness switch,
Avoid too much bass.

When the master volume is set to a comparatively high volume and the loudness switch is turned off, if the expression pedal is set to a low volume according to the performance expression, the bass is insufficient and the performance expression capability is deteriorated. On the contrary, when the master volume is set to a relatively low volume and the loudness switch is turned on, the bass is unnecessarily enhanced when the expression pedal is set to a high volume according to the performance expression. However, it is very annoying to frequently turn on and off the loudness switch during performance.

In view of this problem, the present invention uses a manual operation means such as a loudness switch to solve the shortage of bass which occurs when the expression pedal is used to reduce the volume while playing, and therefore when both hands are closed. The purpose is to improve the performance expression performance of the electronic musical instrument without impairing the operability.

[0006]

SUMMARY OF THE INVENTION An electronic musical instrument of the present invention comprises a tone generator circuit for forming a note sounding signal corresponding to a key operation based on musical tone waveform data stored in a waveform memory, and volume control of the note sounding signal. And a bass booster that relatively boosts the bass component of the note sounding signal at a low volume in response to the operation of the volume control pedal.

[0007]

When the volume is adjusted to a low level by the volume control pedal, the bass which is insufficiently heard is enhanced. Therefore, it is not necessary to operate the loudness switch or the like during the performance, and the expression ability by the volume control pedal can be improved without impairing the operability.

[0008]

1 is a block diagram of an essential part of an electronic musical instrument showing an embodiment of the present invention. This electronic musical instrument has a keyboard 1,
The operation information of the keyboard is detected by the key switch circuit 2,
It is given to the tone generator circuit 3 composed of a CPU. The tone generator circuit 3 reads out waveform data corresponding to a note based on the key information of the keyboard operation from the ROM 14, and modulates its envelope and amplitude based on the key operation information to generate a musical tone signal. The generated musical tone signal is sent to the D / A converter 17
Are converted into audio signals corresponding to the right hand and the left hand by the voltage control amplifier 9 (VCA) via the buffer amplifiers 7 and 8.
Given to. The VCA 9 controls the volume level of the audio signal in response to the volume control signal from the volume control pedal 11. The output of the VCA 9 is supplied to the speakers 16 and 17 via the buffer amplifiers 12 and 13 and the power amplifiers 14 and 15 to form a performance sound.

The waveform ROM 4 stores waveform data corresponding to tone colors of keyboard instruments such as pianos, string instruments such as guitars, wind instruments such as flutes, for example, for each octave, and tone color selection buttons on the operation panel 5 are stored. The tone color data selected by is supplied to the tone generator circuit 3, and the waveform data of the corresponding tone color is read from the ROM at a pitch corresponding to the pitch of the key operation. The operation panel 5 is provided with a volume increasing / decreasing switch 5a as a master volume.

The outputs of the buffer amplifiers 7 and 8 are also given to the low-pass filter 10 which constitutes the bass enhancing means, and the low frequency component of the output is added to the output of the VCA 9 via the resistors R1 and R2. Therefore, a performance sound with enhanced bass is obtained.

The low-pass filter 10 is in parallel with the VCA 9, and its output level is always constant regardless of the operation of the volume control pedal 11. Therefore, when the volume control pedal 11 is set to a low volume, the bass enhancement effect is remarkable, and when the volume control pedal 11 is set to a high volume, the bass enhancement effect is hardly heard. Therefore, the lack of bass can be eliminated without performing a special operation only when the volume control pedal 11 is set to a low volume during a performance. Further, when the volume control pedal 11 is used to make the volume relatively high, it is not necessary to perform a special operation for eliminating the excessive low-pitched sound state.

When a loudness switch (not shown) is provided on the operation panel 5 as in the prior art, and the volume is increased / decreased using the volume increasing / decreasing switch 5a of the master volume,
It can be configured to turn on the loudness switch to enhance bass. In this case, when the loudness switch is turned on, the low pass filter 10 is disabled.

FIG. 2 is a block diagram showing the essential part of another embodiment. In this example, bass enhancement control is performed on the digital waveform signal output from the tone generator circuit 3 of FIG. The digital waveform signal is given to the multiplier 20, and the waveform value is multiplied by the control amount obtained by digitizing the output of the volume control pedal 11 by the A / D converter 21. The digital waveform signal is also given to the digital low-pass filter 22, and the output thereof and the output of the multiplier 20 are added by the adder 23. The added output is led to the D / A converter 6 and converted into left and right audio signals.

Also in the embodiment shown in FIG. 2, when the volume control pedal 11 is set to a low volume during the performance, the lack of bass is eliminated without any special operation.

FIG. 3 shows still another embodiment, in which the digital waveform signal of FIG. 3 is supplied to the digital filter 30 to obtain an output in which the bass is enhanced. A volume control signal obtained by converting the output of the volume control pedal 11 into a digital signal by the A / D converter 31 is applied to the digital filter 30, and the gain control of the digital waveform signal is also performed.

FIG. 4 is a graph showing the gain-frequency characteristic of the digital filter 30, which is the volume control pedal 1.
When the volume control signal of 1 is from maximum (MAX) to a predetermined level of low volume, for example, 15 as represented by MAX.
A filter characteristic for cutting off KHz or higher is shown, and gain control is performed according to this characteristic. Further, when the volume control signal falls below a predetermined level of low volume, the filter characteristic is changed so as to show a low-pass filter characteristic represented by MIN and having a cutoff of 1 KHz, for example, and gain control is performed according to this characteristic.

Therefore, when the volume control pedal 11 is set to the low volume side, the lack of low-pitched tones is compensated. Also, when the volume control pedal 11 is set to a volume above a predetermined level,
The bass enhancement characteristic is canceled. Digital filter 3
As is well known, 0 is composed of a plurality of delay taps, coefficient multipliers and adders, and the multiplication coefficient (connection of taps if necessary) is changed by the control output of the volume control pedal 11. ..

[0018]

As described above, according to the present invention, a manual operation means such as a loudness switch can be used to control the lack of bass sound that occurs when the expression pedal is used to reduce the volume during playing and thus when both hands are closed. Can be supplemented without using, and thereby the performance expression performance of the electronic musical instrument can be improved without impairing operability.

[Brief description of drawings]

FIG. 1 is a block diagram of an electronic musical instrument showing an embodiment of the present invention.

FIG. 2 is a principal block diagram showing another embodiment.

FIG. 3 is a principal block diagram showing still another embodiment.

FIG. 4 is a graph showing gain-frequency characteristics of the digital filter of FIG.

[Explanation of symbols]

 1 keyboard 2 key switch circuit 3 sound source circuit 4 operation panel 5a volume increase / decrease button 6 D / A converter 7, 8 buffer 9 voltage control amplifier 10 low-pass filter 11 volume control pedal 12 buffer amplifier 13 buffer amplifier 14 amplifier 15 speaker 16 speaker 20 Multiplier 21 A / D converter 22 Digital filter 23 Adder 30 Digital filter 31 D / A converter

Claims (1)

[Claims] 1. A tone generator circuit for forming a note sounding signal corresponding to a key operation based on musical tone waveform data stored in a waveform memory, a volume control pedal for controlling the sound volume of the note sounding signal, and the volume control pedal. An electronic musical instrument having a volume control pedal, comprising: a bass enhancing means for relatively enhancing the bass component of the note sounding signal at a low volume in response to the operation of.