JPS5925230B2 - electronic musical instruments - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a first storage circuit that stores musical sound waveforms;
A second storage circuit that stores desired rising and falling envelope waveforms of musical tones, and a multiplication circuit that multiplies the output signals of the first and second storage circuits, The purpose of this invention is to newly provide a steady-state envelope circuit in an electronic musical instrument that obtains an envelope, and to add changes to the envelope of the steady-state part from the rise to the fall of a musical tone.

A conventional electronic musical instrument of this type is constructed as shown in the block diagram shown in FIG.

In the figure, 1 is a first storage circuit that stores musical sound waveforms; 2
3 is a lock oscillator that oscillates a frequency that is an integral multiple of the frequency of the desired musical tone; 3 is a clock oscillator that counts the output signal of the clock oscillator 2;
The first step is to read out the musical sound waveform stored in the memory circuit 1 of the
4 is a keyboard circuit that outputs a signal when a key is pressed or released, 5 is a multiplication circuit, and 6 is a second circuit that stores envelope waveforms of the rising and falling edges of musical tones.
T is a second decoder that reads out the envelope waveform stored in the second memory circuit 6, 8 is a second decoder
This is the clock oscillator that drives the decoder. In addition, in FIG.
The output signal C shows the envelope waveform of the output signal of the multiplication circuit 5. The operation of the block diagram shown in FIG. 1 will be explained below with reference to the waveform diagram shown in FIG. 2.

The signal output from the keyboard circuit 4 when a key is pressed operates the first decoder 3 and the second decoder 7, and the first decoder 3 reads the musical sound waveform stored in the first memory circuit 1. At the same time as reading starts, the second decoder T starts reading the rising envelope waveform a of the envelope waveforms stored in the second storage circuit 6. The second decoder 7 is one of the second memory circuits 6.
Once the addresses from the kth to the kth address, that is, the rising envelope waveform a, are read out, the reading is temporarily stopped. While the second decoder 7 stops reading, that is, the constant portion of the musical tone continues to linearly hold the designated value of the k-th address in the second storage circuit 6. When the keyboard is released, the second decoder 7 receives the signal output from the keyboard circuit 4 (k) of the second memory circuit 6.
+1) The reading of the addresses from the m-th to the m-th, that is, the falling envelope waveform b, is resumed, and when the m-th address is read, the operation is automatically stopped, and at the same time, the first decoder 3 also starts its operation. Stop. As described above, in the conventional electronic musical instrument of this type, the designated value of the k-th address is simply held linearly in the steady state from the end of the rising edge to the beginning of the falling edge of the envelope of the musical tone. The present invention attempts to add a change to the steady-state envelope, and as shown in FIG. Although the operation is temporarily stopped, the signal generated at this time is applied to the steady-state envelope circuit 10 to cause the circuit 10 to operate.

The steady-state envelope circuit 10 includes, for example, a third storage circuit 10a and a third decoder 10, as shown in FIG.
The third decoder 10b is operated by the signal from the second decoder 7 and outputs the waveform stored in the third storage circuit 10a, for example, FIG. One of the waveforms shown in FIG. Then, at the same time as the second decoder 7 starts the read operation again, the steady-state envelope circuit 1
The third decoder 10b in 0 stops operating. Therefore, if the third storage circuit stores a waveform as shown in FIG. 5, the output signal of the multiplier circuit 5 will be as shown in FIG. In addition, the first, second, third
If the output signals of the storage circuits 1, 6', 10a are binary code digital signals, a DA converter for converting them into analog signals is provided at the subsequent stage of the multiplier circuit 5.

As described above, according to the present invention, it is possible to arbitrarily and freely add an envelope to the stationary portion of a musical tone, and it is possible to obtain a musical tone rich in variation.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a conventional electronic musical instrument, and Figure 2 is a diagram of a conventional electronic musical instrument.
C is its operating waveform diagram, FIG. 3 is a block diagram of the electronic musical instrument of the present invention, FIG. 4 is an internal block diagram of the steady-state envelope circuit, and FIG. 5 is a storage waveform diagram of the third storage circuit. ,
FIG. 6 is a musical tone envelope waveform diagram of the electronic musical instrument of the present invention. 1...First memory circuit, 3...First decoder 5...Multiplication circuit, 6...
Second memory circuit, 7...Second decoder 1
0...Stationary part envelope circuit.

Claims (1)

[Claims] 1 a first memory circuit that stores musical sound waveforms;
a first decoder that reads musical sound waveforms stored in a storage circuit; a second storage circuit that stores desired rising and falling envelope waveforms of musical tones; a second decoder that reads out an envelope waveform of the first memory circuit and the second memory circuit, and a multiplier circuit that multiplies the output signals of the first memory circuit and the second memory circuit to form a tone having a desired rising and falling envelope waveform; In the electronic musical instrument, the second decoder starts operating at the same time as it finishes reading out the rising envelope waveform in the second memory circuit and temporarily stops its operation, and A steady-state envelope circuit is provided that stops operating at the same time as the second decoder resumes operation to start reading the down-bound envelope waveform, and the steady-state envelope circuit stores a part of an arbitrary steady-state envelope waveform. During operation, the electronic musical instrument repeatedly reads out the steady-state envelope waveform, outputs a steady-state envelope waveform signal having a desired periodic change, and supplies the signal to the multiplication circuit.