JPS6338990A - Electronic musical instrument - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electronic musical instrument that attempts to improve the drawbacks of the channel assignment method of electronic musical instruments.

BACKGROUND OF THE INVENTION In recent years, advances in electronic musical instrument digital technology have made it possible to perform high-speed processing in musical tone synthesis sections, resulting in remarkable improvements in sound quality. However, the number of sounding channels is still as low as ever, and various methods of channel assignment have been devised (for example,
23693).

Hereinafter, the above-mentioned 17 electronic musical instruments will be explained with reference to the drawings.

FIG. 4 shows the blocks of a conventional electronic musical instrument.

In FIG. 4, 1 is a keyboard that sends information related to keyboard operations, 2 is a key operation detection unit that generates a key-on signal, pitch data, and level data from the keyboard operation information sent from the keyboard 1, and 3 is a key a key code memory that generates a key code (pitch data that can be recognized by the waveform generator) from the pitch data sent from the operation detection unit 2;
Reference numeral 6 indicates a waveform generation unit that sends out waveform data corresponding to the key code sent out from the key code memory 3, and e indicates the priority order of the next channel to be assigned based on the envelope of each channel sent out from the envelope control unit 19. A channel search section 7 determines and sends out channel assignment priority information, and 7 assigns the channel selected by the channel assignment priority information sent out from the channel search section 6 in synchronization with the key-on signal sent out from the key operation detection section 2. a channel assignment unit that sends out signals;
9 is a multiplication unit that multiplies the waveform data sent from the waveform generation unit 6 and the envelope sent from the envelope control unit 19; 19 is an envelope control unit that sends the envelope to the channel search unit 6 and the multiplication unit 9; 1Q; 11 is a sound system that generates a desired musical tone signal based on an analog signal sent from a DA converter (hereinafter referred to as DAC) that performs ODA conversion of the multiplication result sent from a multiplication section; and 11, DAClo.

FIG. 6 shows an envelope control section 19 of a conventional electronic musical instrument. In FIG. 6, 14 is a subtracter that updates the envelope, DELT person - ENV (ΔENv)
is proportional to the temporal decay rate of the envelope.

16 is a gate that sets level data in the envelope register 16 by an assign signal, and 16 is an envelope register that stores an envelope that attenuates at an attenuation rate of ΔENV.

The operation of the electronic musical instrument configured as described above will be explained below.

First, based on keyboard operation information sent from the keyboard 1, a key-on signal, pitch data, and level data are generated in the key operation detection section 2.

The key-on signal is sent to the channel assignment section 7.

Then, in the channel assignment section, the key-on signal is assigned to the channel with the highest priority based on the channel assignment priority information determined by the channel search section 6. It is sent to the key code memory 3 and the envelope control section 19 as an assignment signal.

Then, the key code memory 3 converts the pitch data sent from the key operation detection section 2 into a key code at the generation timing of the assignment signal, and sends the key code to the waveform generation section 6 on the selected channel. Ru. Further, in the envelope control unit 19, level data is set in the -pre register 16 at the timing of generation of the above-mentioned assign signal, and thereafter, each time it is subtracted by ΔENV, it is stored in the envelope register 16 as an envelope, and the data is stored in the envelope register 16 as an envelope. 9 and is sent to the channel search unit 6. The channel search section 6 compares the envelope numbers of each channel sent from the envelope control section 19, and determines the priority order of channels to be assigned in descending order of level. The priority information is then sent to the channel assignment section 7 as channel assignment priority information.

Problems to be Solved by the Invention However, with the above configuration, even in the case of repeated hits of the same pitch as shown in FIGS. ), the resulting musical tone signal has the disadvantage that it is the sum of Wl and W2. In fact, when an acoustic piano or the like is repeatedly struck at the same pitch, the sound generated by the first keystroke is muffled (damped) by the second keystroke, and then the sound produced by the second keystroke is generated. That is, the waveform forms as shown in FIG. 6 □h.

In view of the above-mentioned drawbacks, the present invention has been developed so that even when repeatedly hitting the same pitch,
To provide a complete musical instrument capable of obtaining a musical tone signal in which the sound generated by the first keystroke is not the sum of the sound obtained by the second keystroke.

Means for Solving the Problems In order to achieve this object, the electronic musical instrument of the present invention includes a key status memory that stores information on which channel each pitch is assigned to and also sends out a forced mute signal. , an envelope control section capable of forcibly muting the sound by switching attenuation data using a forced mute signal sent from the key status memory.

Effect With this configuration, by forcibly muting the sound using the pronunciation flag stored in the key status memory, even in the case of repeated hits at the same pitch, the sound generated by the first keystroke is muted by the second keystroke, and the sound generated by the second keystroke is then muted by the second keystroke. A desired musical tone signal such as the sound generated by the second keystroke can be obtained.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of an electronic musical instrument according to an embodiment of the present invention. In Fig. 1, 4 is a key status memory that stores information on which channel each pitch is assigned to and also sends out a forced mute signal, and 8 is a key status memory that stores information on which channel each pitch is assigned to, and 8 is a key status memory that sends out a forced mute signal. At the same time as updating, the envelope is sent to the channel search section 6 and the multiplication section 9, and when the sound generation is completed (envelope - 0), the bit register corresponding to the corresponding channel in the key status memory 4 is reset,
In addition, when the pitch that is currently being sounded is to be sounded again, a forced mute signal is received from the key status memory 4, and the envelope attenuation step width is switched (ΔENV)ΔDMP.
) is an envelope control unit 8 that performs forced sound muffling. Other blocks are the same as in the conventional example.

FIG. 2 shows the contents of the key status memory 4 in this embodiment. In this embodiment, an electronic musical instrument with 88 keys and 8 sounding channels is assumed. The address direction of the key status memory 4 corresponds to each pitch of the 88 keys, and each bit corresponds to a channel. From Figure 2, the current pitch of C4 is channel 1.
You can see that it is pronounced.

FIG. 3 shows the envelope control section 8 in this embodiment. In FIG. 3, reference numeral 12 indicates R3-FF, which is set by the forced mute signal and reset by the sound generation flag reset signal, and 13 indicates R5-FF12, which switches between the normal attenuation width ΔENV and the attenuation width ΔDMP during forced mute.
17 is an envelope-
When 〇, an inverter that sends out a sound generation flag set signal,
18 is a gate that closes when the envelope is -0.

The rest is the same as the conventional example.

FIG. 6 is a diagram comparing waveform forms when the same pitch is repeatedly struck between the conventional electronic musical instrument and the electronic musical instrument of this embodiment.

The electronic musical instrument configured as described above is shown in Figure 1 below.
The operation will be explained using FIG. 2, FIG. 3, and FIG. 6.

First, in Fig. 6g-wh, when the keyboard is pressed, the key-on signal of the first keystroke is detected by the key operation detection unit 2.
from there to the channel allocation section 7.

At this time, if all channels are empty channels, the channel assignment section 7 sends an assignment signal to channel 1, and a W1 signal as shown in FIG. 6f is obtained. Further, the pitch data sent from the key operation detection section 2 is sent as an address to the key status memory 4, and the assignment signal sent from the channel assignment section 7 is written into the key status memory 4. Here, since the assign signal is being sent to channel 1, it is written to bit O.

Then, by pressing the key for the same pitch as the first keystroke, the key-on signal of the second keystroke is transmitted to the key operation detection unit 2.
is sent to the channel allocation module. At this time, since only channel 1 is in the sounding state, the channel assignment section A sends an assignment signal to channel 2, and a W2 signal as shown in FIG. 6g is obtained.

To write the sound generation flag to key status memory 4, write 1.
Pit 1 is set in the same manner as the second keystroke. Here, the sound generation flag is sent to the envelope control section 8 as a forced mute signal before bit 1 is set.

For the forced mute signal, set R3-FF12i, select ΔDMP in the selector 13, and select ΔDMPi until the envelope becomes "○", that is, until the sound generation flag reset signal is generated. Therefore, the waveform form becomes as shown in the sixth figure. .

As described above, according to this embodiment, the key status memory 4
and the pronunciation flag (
By having an envelope control section 8 that can control the attenuation rate of the envelope using a forced silencing signal, a desired musical tone signal can be obtained even when the same pitch is played repeatedly.

As described above, the present invention has a key status memory that stores information on which channel each pitch is assigned to and also sends out a forced mute signal, and an envelope control section that can control the attenuation rate of the envelope. By providing
Even in the case of repeated hits of the same pitch, the sound generated by the first keystroke does not become the sum of the sounds produced by the second keystroke, and the desired musical tone signal can be obtained, which has a great practical effect. .

[Brief explanation of drawings]

Fig. 1 is a block diagram of an electronic musical instrument according to an embodiment of the present invention, Fig. 2 is a block diagram showing the contents of the key status memory, Fig. 3 is a block diagram of the envelope control section, and Fig. 4 is a block diagram showing the contents of the key status memory.
Figure 6 is a block diagram of a conventional electronic musical instrument, Figure 6 is a block diagram of an envelope control section of a conventional electronic musical instrument, and Figure 6 is a case in which the conventional electronic musical instrument and the electronic musical instrument of this embodiment repeatedly hit the same pitch. FIG. 3 is a waveform diagram for comparing waveform forms of FIG. 1... Keyboard, 2... Key operation detection unit, 3... Key code memory, 4...
・Key status memory, 5...--Waveform generator, 6
... Channel search section, 7... Channel selection section, 8.19... Envelope control section, 9
...Multiplication section, 10...DA converter, 1
1...Sound system, 12...R
5-FF, 13...Selector, 14...Mountain/Subtractor, 16.18...Kate, 16...
・Envelope register, 17...Inverter. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 8 7 6 6 4 3 2 1ch
luck diagram 5

Claims (1)

[Claims] A keyboard that sends out information regarding keyboard operations, a key operation detection section that generates a key-on signal, pitch data, and level data from the keyboard information sent out from the keyboard, and pitch data sent out from the key operation detection section. A key code memory that generates a key code from the key code memory, a waveform generator that sends out waveform data corresponding to the key code sent from the key code memory, and stores information on which channel each pitch is assigned to. In addition, a key status memory that sends out a forced mute signal, an envelope control unit that sends a sound generation flag reset signal to the key status memory, and channel assignment priority information based on the envelope of each channel sent from the envelope control unit. a channel search unit for sending an assignment signal synchronized with the key-on signal sent from the key operation detection unit to the channel selected by the channel assignment priority information sent from the channel search unit; a multiplication section that multiplies the waveform data sent from the waveform generation section and the envelope sent from the envelope control section; a DA converter that converts the multiplication result from D/A; and an analog signal sent from the DA converter. An electronic musical instrument comprising a sound system that generates a desired musical tone signal based on the signal.