JPH071678Y2 - Envelope setting device - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to an envelope setting device for an electronic musical instrument, in particular, a sampling musical instrument.

[Prior Art and its Problems] In a conventional sampling musical instrument, first, a sampled external sound is stored in a waveform memory, and only a desired portion of the stored waveform data is played out in a loop and reproduced.
The tone data is created by multiplying the waveform data read out through the loop reproduction operation by the envelope waveform data that is created independently of the sampled external sound. With such a method, it is quite difficult to create an envelope waveform that is faithful to the original sound, which requires several trial and error.

[Object of the Invention] The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an envelope setting device capable of setting an envelope waveform faithful to an original sound by a simple operation.

[Summary of the Invention] In order to achieve the above-mentioned object, the present invention displays an envelope curve of an external sound sampled and looks at the displayed envelope curve to see some envelopes on the envelope curve. The point is that an envelope waveform that sequentially connects adjacent points is automatically generated by designating points.

[Embodiment] An embodiment of the present invention will be described below in detail with reference to the drawings.

<Structure of Embodiment> FIG. 1 shows an overall circuit diagram of a sampling musical instrument constructed by applying the present invention. In the drawing, numeral 1 is a triple mode selection switch, in which contact 1a is closed and contact 1b is The connection state shown, which is open and the contact 1c on the right side, corresponds to the sampling mode, while the connection state, in which the contact 1a is opened, the contact 1b is closed and the contact 1c is on the left side, corresponds to the playing mode. .

In the sampling mode connected as shown in the figure, the waveform memory 2 waveforms the external sound which is picked up by the microphone 4 and converted into a digital value by the A / D converter 5 according to the write address from the address generator 3. Store as data. Further, 6 is an envelope extractor for extracting the envelope of the external sound picked up by the microphone 4,
The envelope memory 7 stores the envelope extracted by the envelope extractor 6 as data, and the display drive device 8
Envelope data stored in the envelope memory 7 is displayed on the display device 9. In addition, a cursor moving device
Reference numeral 10 denotes a cursor moving device (for example, a mouse) that can be moved on a flat table corresponding to the coordinates of the display screen on the display device 9, and displays the envelope displayed on the display device 9. Positioning of the cursor, which is used to create the desired envelope waveform while looking and is shown as a light spot on the display screen, is performed by the position determination switch 11. The cursor position / display data converter 12 converts the path moved by the cursor moving device 10 into data suitable for display, and displays the data on the display device 9 via the display drive device 8 as a locus. Further, the cursor position / envelope data converter 13 displays the time from the start of sounding of the envelope switching point and its size from the coordinate position determined by the position determination switch 11 when the cursor moving device 10 is moved. The data is calculated, and the envelope data memory 14 stores the data. Envelope data / display data converter 15 is an envelope data memory
The data stored in 14 is converted into data suitable for display, and is displayed on the display device 9 via the display drive device 8.
That is, the display on the display device 9 based on the display data from the envelope data / display data converter 15 connects the two points each time the cursor moving device 10 and the position determination switch 11 determine the two point positions. It will be displayed as a straight line.

In the play mode, the loop address generator 16 outputs a read address based on the loop start address and the loop end address from the loop address register 17, which stores a loop section for repeated reading arbitrarily selected by the performer. Since it is generated, a predetermined loop section of the waveform data stored in the waveform memory 2 is repeatedly read by the read address from the loop address generator 16. The multiplier 18 multiplies the waveform data from the waveform memory 2 by the envelope data generated from the envelope generator 19 in accordance with the data stored in the envelope data memory 14 to create musical tone data, so the D / A converter 20 Converts the digital value output from the multiplier 18 into an analog value, and the speaker 21 emits the musical sound data converted into the analog value as a musical sound.

FIG. 2 schematically shows waveform data of digital values stored in the waveform memory 2. The vertical axis corresponds to the address and the horizontal axis corresponds to the amplitude. Between points A and B, the performance mode is set. A loop section that is repeatedly read
The start address indicated by the point and the end address indicated by the point B are arbitrarily designated by the performer and stored in the loop address register 17.

FIG. 3 is a diagram schematically showing the envelope data of the external sound stored in the envelope memory 7, in which the vertical axis corresponds to the address and the horizontal axis corresponds to the amplitude, and high frequencies represented by fine jagged edges. It is an envelope curve with ingredients. Originally, this envelope can be used as an envelope waveform most faithful to the original sound, but since it has too many high-frequency components, it has an unfavorable effect on musical tones especially at low scales. According to this invention, as will be made clear as the description proceeds, an envelope waveform extremely faithful to the original sound excluding such high frequency components can be obtained.

Figure 4 shows the contents of data stored in the envelope data memory 14, the slope of P ₀ in order from the top storage area, the size of P _0, the slope of P _1, wherein the size ...... P ₁ ,
The data for P ₀ , P ₁ , ... Is provided by placing the cursor moving device 10 at a desired position and determining that position by the position determination switch 11.

FIG. 5 shows an envelope waveform generated by the envelope generator 19 based on the data P ₀ , P ₁ , ... Stored in the envelope data memory 14, the horizontal axis represents time and the vertical axis represents magnitude. ing. As is clear from the drawing, the envelope waveform of this example rises from the origin P ₀ to a magnitude (level value) indicated by P ₁ with a constant slope (rate value), and then to the magnitude of P _2. Until it reaches a zero level indicated by P ₃ with another slope, and this waveform moves the cursor moving device 10 by looking at the envelope of FIG. Then, the envelope waveform is formed by connecting each point (Q ₀ , Q ₁ , Q ₂ , Q ₃ ) determined by using the position determination switch 11 with a straight line in order.

<Operation of Embodiment> Next, the operation of this embodiment will be described.

First, in the sampling mode, the external sound picked up by the microphone 4 is sequentially stored in the waveform memory 2 as a digital value via the A / D converter 5, while the envelope is extracted by the envelope extractor 6. , The display device 9 via the envelope memory 7 and the display drive device 8.
Then, the image is displayed as a waveform as shown in FIG.

Here, while watching the waveform displayed on the display device 9, the operator moves the cursor moving device 10 to align the cursor as a light spot with the origin Q ₀ on the screen, and operates the position determination switch 11. After confirming the position, the cursor moving device 10 is moved again to move the cursor to ... Q ₁ , and the position determining switch 11 is also operated to confirm the position. Then, by the same operation,
Determine the positions of points Q ₂ and Q ₃ .

When the position determining operation proceeds, the cursor position / envelope data converter 13 determines the size and inclination data at each point based on the confirmed position and stores them in the envelope data memory 14 sequentially. The data stored in the envelope data memory 14 connects the respective points (Q ₀ , Q ₁ , Q ₂ , Q ₃ ) on the display device 9 in order via the envelope data / display data converter 15 and the display drive device 8. Since it is displayed as a figure indicated by a straight line, it is possible to confirm how faithful the original waveform is. Points set in this way
Q ₀ , Q ₁ , Q ₂ and Q ₃ correspond to points P ₀ , P ₁ , P ₂ and P ₃ of the envelope waveform in FIG. 4 (b), respectively.

After that, the operator sets an arbitrary loop section to be repeatedly read for the waveform data stored in the waveform memory 2, and the loop start address A and the loop end address B as shown in FIG. It is stored in the address register 17.

Next, in the performance mode, the waveform data stored in the waveform memory 2 is read based on the reading speed corresponding to the key code designated by the key depression on the keyboard (not shown). The waveform data repeatedly read from 2 is multiplied in the multiplier 18 by the envelope data (corresponding to the waveform shown in FIG. 5) generated in the envelope generator 19 according to the data stored in the envelope data memory 14. It becomes musical tone data, and the speaker 21 via the D / A converter 20
Will be emitted as a musical sound.

[Effect of Device] As described in detail above, this device displays the envelope of the external sound obtained by sampling, and while observing the displayed envelope, several points on the envelope are displayed. By specifying, the envelope waveform connecting the adjacent points sequentially is automatically generated, so that an envelope waveform extremely faithful to the original sound obtained by sampling can be easily obtained.

[Brief description of drawings]

FIG. 1 is an overall circuit diagram of a sampling musical instrument constructed by applying the present invention, FIG. 2 is a diagram schematically showing the contents of a waveform memory, and FIG. 3 is a diagram schematically showing the contents of an envelope memory. FIG. 4 is a diagram showing the data format of the envelope data memory, and FIG. 5 is an output waveform diagram of the envelope generator. 4 ... Microphone, 6 ... Envelope extractor, 9 ...
Display device, 10 Cursor moving device, 11 Position determination switch, 12 Cursor position / display data converter, 13
...... Cursor position / envelope data converter, 15 ……
Envelope data / display data converter, 19 ... Envelope generator.

Claims (1)

[Scope of utility model registration request] 1. Envelope extraction means for extracting an envelope of an external sound obtained by sampling, display means for displaying the envelope extracted by the envelope extraction means, and a display screen of the display means. An envelope setting device comprising position specifying means capable of specifying any of the points, and envelope generating means for creating envelope data formed by sequentially connecting the points specified by the position specifying means.