KR970002328Y1 - Attack effect generating device of digital piano - Google Patents

Abstract

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Description

Attack effect generator of digital piano

1 is a block diagram of a sound generator of a conventional digital piano.

2 is a block diagram of an attack effect generator of the present invention digital piano.

3 is a detailed circuit diagram of an attack unit according to the present invention.

4 is a process of generating a conventional digital piano sound.

5 is a waveform diagram of sound generation according to FIG. 1;

6 is a waveform diagram of sound generation according to FIG. 2;

＊ Explanation of symbols on main parts of drawing

1: 88 keys 2: kiss can

3: pedal 4: central processing unit

5: display and tone selector 6, 10, 32: ROM

7: RAM 8: Envelope Oscillator

9: waveform oscillator 11, 12: sample and hole part

13 voltage control filter 14 voltage control amplifier

15 amplifier 16 speaker

17 mixer 18 attack part

31: negative synthesis device 33: power generation unit

34: buffer unit 35: first low pass filter

36: second low pass filter

The present invention relates to the generation of piano sounds. In particular, the attack corresponding to the beginning of the piano envelope is made so that the digital piano is suitable for generating the characteristics of the same characteristics as the existing acoustic piano sounds. An apparatus for generating an attack effect of a digital pano to show the characteristics of a part).

FIG. 1 is a block diagram of a sound generator of a conventional digital piano. As shown therein, a kisscan unit 2 which detects pressing of an 88 key 1 and a pedal 3, and a pressed key are displayed. The display and tone selection switch unit 5 for selecting the timbre of the keyboard and the output signals of the kisscan unit 2 and the display and tone selection switch unit 5 are applied to the program embedded in the ROM 6. According to the central processing unit (4) for generating a control signal, and the envelope oscillator for receiving the control signal of the central processing unit (4) and outputs the envelope signal of the keyboard and sound tone pressed in accordance with the data information stored in the RAM ( 8) and a waveform generator 9 for continuously outputting sampling waveforms of the acoustic piano stored in the ROM 10, and a sample and hold unit 11 for sample-and-holding the envelope signal of the envelope oscillator 8. 12) and the sample and hold of the sample and hold section 11 The voltage control filter 13 for shaping the output waveform of the waveform oscillator 9 and the voltage control amplifier for amplifying the output of the voltage control filter 13 according to the output signal of the sample and hold unit 12 according to the present invention. (14), and the amplifier 15 for amplifying the output signal of the voltage control amplifier 14 and outputs through the speaker 216, the operation state thereof will be described as follows.

First, when one key of the 88 keys 1 is pressed, the kisscan unit 2 that is scanning the key detects that the key is pressed, and enters the central processing unit 4, the central processing unit 4 displays and In order to generate the corresponding tone by irradiating the tone selector switch 5, each tone is added to the waveform oscillator 9 and the envelope oscillator 8 by referring to the ROM 6 in which the operation program of the central processing unit 4 is incorporated. The control signal is sent to generate a signal corresponding to the pitch.

Accordingly, the waveform oscillator 9 generates a continuous waveform by repeatedly reading what is stored in the ROM 10 by sampling only a few cycles of the waveform of the acoustic piano, and generating the envelope. The section 8 generates an envelope signal according to the tone and the key pressed by referring to the data stored in the RAM 7 and the envelope waveform generation calculation result, and the envelope is a sample and hold section ( 11) 12 to be sampled and held. On the other hand, the voltage control filter 13 shapes the output waveform of the waveform oscillator 9 according to the sample add value of the sample and hold unit 11, and the voltage control amplifier 14 is the sample and hold unit 12. The output signal of the voltage control filter 13 is amplified according to the sample and hold value of.

The signal output in this way is shaped similarly to the phanoe sound, and this lowered signal is amplified by the amplifier 15 and output to the speaker 16.

However, the conventional sound generator of the digital piano has a voltage control filter that reads repeatedly the ROM data in order to reproduce only the few cycles that are a part of each acoustic piano's actual sound and to store the data stored in the ROM as a continuous sound. Because it is similar to the piano sound while going through the voltage control amplifier, there was a problem that the harmonic component and the drastic change component, which are particularly prominent in the piano song, are deleted, which makes a big difference from the sound of the actual acoustic piano.

In order to solve this problem, the data and the present invention generate an attack signal when one of the keys of F # 5-C8 is pressed to reproduce a dynamic and rapidly changing sound such as the actual acostack piano sound. An apparatus for generating an attack effect, which will be described below with reference to the accompanying drawings.

2 is a block diagram of an attack effect generator of the digital piano of the present invention. As shown in FIG. 2, the kisscan unit 2 for detecting the pressing of the 88 key 1 and the pedal 3 and the pressed key are displayed. In addition, the display and tone selection switch unit 5 for selecting the timbre of the keyboard and the output signals of the scan unit 2 and the display and tone selection switch unit 5 are input to the program embedded in the ROM 6. And an envelope oscillator for receiving a control signal of the central processing unit 4 and an envelope signal of a pressed key and a tone according to the data information stored in the RAM 7. (8) and the waveform oscillator 9 for continuously outputting the sampling waveforms of the acoustic piano stored in the ROM 10, and the sample and hold unit 11 for sample and hold the envelope signal of the envelope oscillator 8. 12) and the output signal of the sample and hold section 11 The voltage control filter 13 for shaping the output waveform of the waveform oscillator 9 and the voltage control for amplifying the output signal of the voltage control filter 13 according to the output signal of the sample and hold unit 12 according to the present invention. An amplifier 14 and an attack unit 18 for generating an attack signal if the key pressed by receiving the control signal of the central processing unit 4 is a key of a high range (F # 5-C8), and the attack unit ( A mixer 17 for synthesizing the output signal of the controller 18 and the output signal of the voltage control amplifier 14, and an amplifier 15 for amplifying and outputting the signal synthesized by the mixer 17 through the speaker 16. The attack part 18 includes a sound synthesis element 31 for generating an attack waveform corresponding to the attack sound stored in the ROM 32 according to the control signal of the central processing unit 4, and the resistors R6 and R7. ), A capacitor (C10, C11) and the op amp (OP4) inverted and amplified the power supply (-Voc) to supply the power supply (VDD) to the sound synthesis element (31). A buffer unit 32 comprising a power supply unit 33, a capacitor C3 and an op amp OP1 to stabilize the output signal of the sound synthesis element 31, resistors R1-R4, and a capacitor ( C4-C6) and an op amp (OP2), the first low pass filter 34 for low-passing the output signal of the buffer unit 32 to remove noise components, resistor R5, and capacitor C7- C9) and an op amp OP3 to pass the output signal of the first low pass filter 34 to the low pass to remove the noise component and to output the mixer 17 to the mixer 17. .

When described with reference to the accompanying drawings, the operation, the effect of the present invention is configured as follows.

When one of the 88 keys (1) is pressed, the kisscan unit (2) detects whether the pressed key, the pedal (3), etc. are pressed and sends it to the central processing unit (4). According to the state of the display and tone selection switch unit 5 sends a control signal to generate a sound of the corresponding tone by the waveform oscillator 9 and the envelope oscillator 8 by a program embedded in the ROM 6. Thus, the waveform oscillator 9 repeatedly reads the waveform data of the ROM 10 to generate a sustained sound waveform of the corresponding tone, and the envelope oscillator 8 refers to the ram 7 and presses the envelope signal according to the pressed key and tone. The envelope signal is sequentially distributed to the voltage control filter 13 and the voltage control amplifier 14 by the sample and hold sections 11 and 12.

At this time, if the pressed key is any of the keys of F # 5-C8 in which the effect of the attack portion is outstanding, the central processing unit 4 sends a control signal to generate an attack effect to the attack unit 18. Accordingly, the sound synthesis element 31 of the attack unit 18 receives the power of the power generation unit 33 to generate an attack waveform by referring to data stored in the ROM 32, and the attack waveform is the buffer unit 34. After the stabilization is performed through the resistors (R1, R2) and the capacitor (C4) is input to the op amp (OP2) of the first low pass filter (35). Accordingly, the first low pass filter 35 filters the attack waveform to remove noise, and then passes through the resistors R3-R5 and capacitors C6 and C7 to the op amp OP3 of the second low pass filter 36. Is authorized.

Accordingly, the second low pass filter 36 filters the noise again to remove the noise component of the attack sound heap reproduction process and applies the attack signal component to the mixer 17 through the condenser C9.

Accordingly, the mixer 17 synthesizes an output signal of the second low pass filter 36 of the attack unit 18 and the voltage control amplifier 14, which is amplified by the amplifier 15 and then the speaker. The generated sound is output through (16).

Therefore, the present invention repeatedly reads and reproduces the ROM data sampled only a few cycles of the actual piano sound waveform when playing the piano sound in digital piano or electronic musical instrument as shown in the fourth building. Although it was impossible to reproduce the dynamic piano sound by removing the attack component by playing the piano sound through the back (FIG. 5), the attack part 18 configured as shown in FIG. 3 was configured as shown in FIG. In the high range where the attack waveform leading to and the like exhibits a significant influence on the generated sound, it is possible to generate a dynamic and rapidly changing sound (FIG. 6) like an acoustic piano sound.

Claims (2)

A display and tone selection switch section 5 for displaying the key can and the pressed key for detecting the depression of the 88 key 1 and the pedal 3 and the pressed key, and for selecting the tone of the key; The keyboard and tone pressed according to the data information stored in RAM 7 by receiving the output signal from the unit 2 and the display and tone selection switch unit 5 and receiving a control signal according to a program embedded in the ROM 6. An envelope oscillator 8 for outputting an envelope signal of the waveform and a waveform oscillator 9 for continuously outputting a sampling waveform of an acoustic piano stored in the ROM 10, and sample and hold the envelope signal of the envelope oscillator 8; A sample-and-hold unit 11 and 12, a voltage control filter 13 for shaping the output waveform of the waveform oscillator 9 according to the output signal of the sample-and-hold unit 11, and the sample-and-hold unit According to the output signal of (12), the output signal of the voltage control filter 13 The voltage control amplifier 14 and the attack unit 18 in which a key pressed under the control signal of the central processing unit 4 generates a high-frequency (F # 5-C8) temporary attack waveform; A mixer 17 for synthesizing the output signal of the unit 18 and the output signal of the voltage control amplifier 14, and an amplifier 15 for amplifying and outputting the signal synthesized in the mixer 17 to the speaker 16; Attack effect generator of the digital piano, characterized in that consisting of. The method of claim 1, wherein the attack unit 18 and the sound synthesis device 31 for generating an attack waveform corresponding to the attack sound stored in the ROM 32 in accordance with the control signal of the central processing unit (4), the sound synthesis A power generator 33 for supplying power VDD to the element 31, a buffer unit 34 for stabilizing the output signal of the negative synthesis element 31, and an output signal of the buffer unit 34. A first low pass filter 35 for removing the included noise and a second low pass filter 36 for removing the noise contained in the output signal of the first low pass filter 35 Attack effect generator of digital piano.