JPS6023354B2 - Volume envelope control device - Google Patents

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 and its problems]

To explain the conventional volume envelope control device using FIG. A corresponding tone pitch clock signal is selected by supplying V to the high clock generating section 102.

The pitch clock signal output from the pitch clock generator 102 is applied to a 5-bit binary counter 103 as a counting step signal. That is, this step counter 10
3 is the "32
'' (0 to 31), and each 5-bit output is outputted by the decoder 104 as an output of ``32'' to generate an output signal sequentially at each counting step, and the tone waveform is read out from the tone waveform generator 105. be. Musical sound waveform creation section 105
For example, the values for each step can be digitized and fixedly stored in a ROM (read-only memory) in accordance with the waveform shown in FIG. 2, or the waveform shown in FIG. 2 can be created by selecting a switch for each step. It is now possible to specify numerical values corresponding to . The output values sequentially read out for each step from the tone waveform creation section 105 are supplied to the multiplication circuit 106. This multiplication circuit 106 outputs a value obtained by multiplying 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 waits), and an additional 2 bits are added to the upper part. (32,64
A state counter 108 (wait) is followed in series. The state counter 108 is incremented for each shield of the envelope counter 107 in order to detect the clear (key released), attack, sustain, and release states of the volume envelope. The counted state of the state counter 108 is decoded by a state detection circuit 109, and a corresponding state detection signal is sent to the multiplication circuit 106 as a control signal. In other words, in the attack state, the count value of the envelope counter 107 is used as the volume control value, and in the detection of the sustain state, the maximum amplitude value "31" is set as the volume control value in the sustain state of the envelope, regardless of the count increment of the envelope counter 107. In addition, when detecting the release state, the complementary value obtained by inverting the 5-bit output value of the envelope counter 107 is used as the volume control value, so that the envelope counter 107 does not count down in the release state. Substantially the same control as a down count is performed. Then, the volume control value obtained by controlling the count value of the envelope counter 107 in the attack, sustain, and release states as described above is obtained by combining the output value for each step read from the musical sound waveform creation section 105 with the multiplication circuit 106. will be multiplied. 5 of the envelope counter 107
The bit output is connected to the adder 1.

To this adder 1 10, the 01 counting time or 0 step detection signal of the step counter 103 from the decoder 104 is applied as a 10 IJ addition signal, synchronized with the 0 step of one cycle of the musical sound waveform. and every cycle '
The 11th will be calculated. The output value added by the adder 110 is inputted again to the envelope counter 107, so that the volume control value is incremented by "1" at the "0" step of every cycle of the step counter 103. The output value of the multiplication circuit 106 is adder 1
11 to an accumulator 112;
The output of 2 is fed back to the adder 111 to be accumulated, and is outputted as sound from the speaker 115 via the D/A (digital-to-analog) conversion circuit 1 13 and the filter 14 in this order. According to the above-mentioned basic structure, pitch clock signals corresponding to keys operated on the performance keyboard 100 are outputted from the pitch clock generation section 102 and counted by the step counter 1.03. Further, by operating the key, the state counter 108 is set from the clear state of "00" to the attack state of "10". and,
In this attack state, the step counter 103 is “0”.
The signal output from the decoder 104 during step counting causes the adder 110 to count ``111'' every cycle of the musical waveform. Therefore, as shown in FIG.
The musical sound waveform shown in Figure 2, which completes one cycle in two steps (
3) is multiplied by the volume control value of the envelope counter 107 every cycle when the volume control value of the envelope counter 107 changes.
It is generated as a gradually larger output value. In this attack state, the envelope counter 107 is up to 32 decimal ("
11111-counting state), the state counter 108 changes to the sustain state of "01". In the sustain state, the envelope counter 107 is again incremented every cycle from the "00000 one counting state" as described above, but since the sustain state detection signal from the state detection circuit 109 is supplied to the upper test multiplication circuit 106, the envelope counter 107 appears to be The volume control value is controlled to be the maximum amplitude value 31 (“11111-counting state”), and during the sustain period, the volume control value multiplied by the read output value of the musical waveform is the same value. When the counter 107 reaches the maximum 32-decimal value again, the state counter 108 becomes "1L released state."
In the released state, the envelope counter 107 is "0".
The count is incremented every cycle from the state of "0000" in synchronization with the "0" step, but since the volume is in the direction of decreasing in the release state, the multiplication circuit 106
The volume control value is controlled to be the complement value of "31" of the relevant count value of 07, and as shown in FIG. (Same as down counting)
It starts to get colder. According to such a configuration, it is possible to absorb noise components generated at the attack time or release time into the frequency spectrum components of the musical sound waveform, and it is possible to obtain the effect that the noise is not perceived. However, in the operation with such a configuration, the one cycle period of the step counter 103 also changes due to the difference in the frequency of the pitch clock signal generated by the pitch clock generator 102 corresponding to each key. A major drawback is that the shape of the envelope differs depending on the pitch. [Objective of the Invention] The present invention aims to solve these drawbacks and provide a volume envelope control device in which the shape of the envelope does not change or becomes a desired shape no matter which key is operated. be.

[Key points of the invention]

In order to achieve this object, the present invention outputs added value data selected based on a key code generated in response to an operated key at a predetermined timing, adds it to other data, and sends it to an envelope counter. This is to control the volume envelope.

〔Example〕

FIG. 5 shows an embodiment of the present invention, and parts similar to those in FIG. 1 are given the same numbers.

The configuration and operation of this embodiment are almost the same as those in FIG.
A different addition value for each octave is selected from among a plurality of addition values preset in the adder 6 and sent 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 we assume that the range from the lowest octave to the highest octave is 4 octaves, and the octaves are 0 to 04 in order from the lowest octave, for example, in octave 0, the additional value is "8", in octave 02, the additional value is "4", and in octave 03, the additional value is "4".
For the second octave 04, the addition value "1" is selected, and the addition value that differs depending on the octave is supplied to the adder 11. Therefore, the step counter 103 "
By synchronizing with the step counting and supplying different addition values for each octave, the attack and release times, which were all different between each octave, are changed to approximately the same time between each octave. I can do it, Enbe. It is possible to ensure that the shapes of the loops do not differ. It goes without saying that a desired shape can also be obtained by setting the force calculation value. This eliminates the possibility that, for example, when the C4 key is operated and the C7 key is operated, the shape of the envelope changes and different tones are heard. Although this embodiment uses octave data of the key code, it goes without saying that scale data may also be used, and both types of data may be used.

〔Effect of the invention〕

As explained above, the present invention selects and outputs predetermined added value data at a predetermined timing based on the key code generated in response to the operated key, and outputs this added value data and the envelope counter means. Since the data is added to the envelope counter means and sent to the envelope counter means, it is possible to eliminate the fact that the shape of the envelope differs depending on the key operated, that is, the pitch, or it is possible to obtain a desired shape, thereby achieving a desirable performance. It can be performed.

[Brief explanation of the drawing]

Figure 1 shows the volume of the subordinate. Figure 2 is a musical sound waveform diagram used to explain Figure 1, Figure 3 is an explanatory diagram of the operation in the attack state according to Figure 1, and Figure 4 is also in the release state. FIG. 5 is a circuit configuration diagram showing an embodiment of the present invention. 100... Performance keyboard,
101...Key code memory, 117...
... Octave decoder, 116 ... Adder value selection circuit, 110 ... Adder, 107 ... Envelope counter, 108 ... Status counter. Taryo sardines, 3 acids, 2 necks, 4 figures, Figure 5

Claims (1)

[Claims] 1 reading means for reading out musical sound waveforms from the musical sound waveform storage means in multiple steps based on key codes generated in accordance with operated keys; an additional value data output means for selectively outputting the added value data of when reading a specific step among the steps, an envelope counter means, and output data of the envelope counter means and the predetermined additional value data selectively outputted. A volume envelope control device comprising: means for adding and sending the sum to the envelope counter means.