JPS59107387A - Sound volume envelope controller - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a volume envelope control device for an electronic musical instrument.

[Prior art]

The conventional volume envelope control device U8 will be explained using FIG.
The stored key code is supplied to the tone 7% clock generator 102 to select the corresponding pitch clock signal.The pitch clock signal output from the 6° pitch clock generator 102 is a 5-bit pitch clock signal. biprecounter 1
At 03, the IJU signal is turned off as a gf signal. Ha1
In particular, this step counter 1 (I3 is used to clear the counting state of r32J (0 to 31) that counts the closure step of one cycle of the musical sound waveform, and the output of each 5 bits is determined by the decoder 1.
At step 04, an output signal is sequentially generated at every counting step as the output of [321], and the tone waveform is read out from the tone waveform generator 105. For example, the musical sound waveform creation section 105
1 Corresponding to the waveform shown in FIG. It is possible to specify a numerical value corresponding to the waveform shown in the figure. Then, the output value is sequentially read out step by step from the musical sound waveform creation section 105 and is supplied to the multiplication circuit 106. 106
outputs a value multiplied by the count value of the envelope counter 107. This envelope counter 107 is a 32-decimal (counting state from 0 to 31) binary counter that always counts up with 5 bits (1, 2, 4, 8, 16 weights), and the upper part is a 2-bit (32-bit) counter. ，
(64 waits) state counters 108 are connected in series. The state counter 108 detects the sound 1↑ (envelope clear (key released), attack, decay, and release), and the envelope counter 107
The count is incremented every cycle. The count state of the state counter 108 is decoded by a state detection circuit 109, and a corresponding state detection signal is supplied to the multiplication circuit 106 as a control signal. In other words, in the attack state, the envelope counter is 10.
The count value of 7 is the volume control value for one song, and when detecting the decay part, it reaches the maximum irrespective of the count increment of the envelope counter 107, and the amplitude 114 "31" is the sound in the decay state of the envelope) i' ,! , ' control value, and in the release state detection, the envelope counter 107 is set to 5.
Pitt output (il, f'i) The inverted complementary value is used as the volume control value, and the envelope counter 107 /,j is counted down in the IJ-like manner.
r<j=ff Control qualitatively similar to down counting is performed. and envelope counter 1
As described above, the volume control value obtained by controlling the count value of 07 using IFI in the attack, decay, and release states is multiplied by the output value for each step read from the musical sound waveform creation section 105 in the multiplication circuit 106. It becomes like this.

The 5-bit output of the envelope counter 107 is supplied to an adder 110. This adder 110 receives a "+" step detection signal from the decoder 104 when the step counter 103 counts "0", that is, a "0" step detection signal. It is applied as a signal and is calculated for each cycle r+tJJ by adding 1υJ to the rOJ step of one cycle of the musical sound waveform. The t stupid value added by the adder 110 is input again to the envelope counter 107, so that the t stupid value added by the adder 110 is inputted again to the envelope counter 107.
The it control value increases by "1". The output value of the multiplication circuit 106 is supplied to the accumulator 112 via the adder 111, and the output of the accumulator 112 is fed back to the adder 111 so that it is accumulated and IJ/A ( digital-analog) conversion circuit 113
and filter 114 in turn, and the speaker 115 outputs an acoustic signal /lV.

According to the above configuration, the pitch clock signal corresponding to the key operated on the performance keyboard 100 is generated as an acoustic clock! 9
Is 102 outputs a total of 47 Z''1. in the step counter 103. Also, by operating the key, the state counter 108 is set from "00" in the Nori state to "10" in the attack state.

Then, 'In this attack state, the step counter is 10.
3, the adder 11 (
Since +11 is added at J, the envelope counter 107 is sequentially incremented by +11 every cycle.

Therefore, as shown in FIG. 3, the musical sound waveform shown in FIG. Sound fit at counter 107,
1till? Every cycle when the all value changes, it is multiplied by the volume control value 117 and is generated as a gradually larger output value from the multiplier circuit 106. In this attack state, the envelope counter 1()7 is up to 32 decimal 1'rl
llll” counting state), the state counter 108 becomes “
It changes to the decay state of 011. In the decay state, the envelope counter 107 is roooo again.

'' From the counting state, Br is incremented by 2 every cycle as described above, but since the decay state detection signal from the state detection circuit 109 is supplied to the multiplication circuit 106, the apparent volume control value becomes the maximum amplitude value 31 (rllll-11 During the decay period, the tone nine control j& multiplied by the readout output value of the musical sound waveform has the same value.

Then, the envelope counter 107 again reaches the maximum value of 32.
When the state becomes advanced, the state counter 108 enters the release state of "11".

In the released state, the envelope color 107 is ro.
o o o OJ state is counted from 1 bear to "0" step every cycle in synchronization with the step, but since the volume is in the direction of decreasing in the release state, the corresponding count value of the envelope counter 107 is supplemented by "31". Control the numerical value to be the volume control value 2, η+1 in Figure 4 <Attack! Contrary to the tk rabbit, the sound ffl gradually decreases by 1% from the maximum amplitude value "31" in the "01 direction (substantially the same as down counting)?corlJ#)%. Like this 7: According to configuration C, it is possible to absorb the noise component generated at the attack time or release time into the frequency smooth component of the musical sound waveform, and it is possible to obtain the effect that the noise is not perceived. , the operation with such a configuration differs in frequency of the pitch clock signal generated by the pitch clock generation section 102 corresponding to each key, and the one cycle period of the step counter 103 also changes. A major drawback is that the attack, decay, and release state times of the envelope are random for each tall clock signal of each axis, and the shape of the envelope is different.

[Objective of this M invention]

The present invention solves these drawbacks and provides a volume envelope control device that does not change the shape of the envelope no matter which key is operated, or has a desired shape.

[Summary of the claimed invention]

In order to achieve such an object, the present invention controls the volume envelope by a counter means using an additional value selected based on a key code corresponding to the operated stone or key.

〔Example〕

Figure 5 shows an example of the Ichimi Tsumugi of the present invention.
Items similar to those shown in the figure are marked with the same symbol.

The configuration and operation of this embodiment are almost the same as those shown in FIG.
A different addition for each octave from among the multiple addition values preset in 6? 1 is selected and supplied to the adder 110. That is, by decoding the octave data of the key codes stored in the key code memory 101 (as is well known, the key code consists of octave data and scale data) by the octave decoder 117, the corresponding octave signals are added. Value select circuit 11
6 as an addition value selection signal. now,
If the lowest octave to highest octave salt is 4 octaves, and the lowest octave is 01 to 04, for example, for octave Ol, the additional value is "8", for octave 02, the additional value is "4J1, for octave o3, the additional value is 4"
In tlt C21, octave 04, the addition value "1" is selected, and different addition values are supplied to the adder 110 depending on the C1 octave. Therefore, when the step counter 103 counts "0" step? In synchronization with this, a different addition value is supplied to the adder 110 within each octave, so that the attack time, which was all different between each octave and 11JJ at the release time, can be made to be approximately the same time between each octave, and the envelope It is possible to ensure that the shapes of the two do not differ. Furthermore, it is of course possible to obtain a desired shape by setting the addition value.

This eliminates the situation where, for example, when you operate the C4 key and the 07 key, the shape of the envelope changes and you hear a different tone.

Note that although this actual 1.1u example was performed using octave data of the key code, it is of course possible to use scale data, and both types of data may be used.

[Effect of the present invention 19)] As explained above, the present invention provides means for selectively outputting a predetermined key based on the key code corresponding to the operated key, and a means for selectively outputting a predetermined key, Counter means fi that controls the volume envelope of the musical sound waveform based on the added value
: Since the envelope shape is provided, it is possible to eliminate the fact that the pre-shape of the envelope differs depending on the operated key, or to obtain a desired shape 7i, thereby making it possible to perform a preferable performance.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram illustrating a conventional pitch envelope iti control device, Fig. 21A is a musical sound waveform diagram as shown in Fig. Figure 4 is a diagram illustrating the operation in the released state, and Figure 5 is a diagram showing the circuit configuration of an embodiment of the present invention. 100... Performance keyboard, 101...
...Key code memory, 117...Octave decoder, 116...Addition value selection circuit, 110...Adder, 107...Envelope counter, 108... ...Status counter. Patent Applicant Casio Computer Co., Ltd. No. 3v -11 Cycle/Musito 1 Sui 7ru → ni -i+j Ikuru 1 Pass ← 1 Buoy No. 7 - Toge 4 times

Claims (1)

[Claims] Means for selecting and outputting a predetermined addition value from among a plurality of preset addition values based on a key code corresponding to an operated key; 1. A volume envelope control device comprising: counter means for controlling a waveform sound envelope.