JPS61273594A - Electronic musical instrument - 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 of invention] The present invention relates to an electronic musical instrument.

[Prior art and its problems]

Conventionally, predetermined waveform information is stored in a waveform memory, and it is stored at a speed corresponding to the musical scale of 11! The waveform information of musical tones is produced by recording the waveform information of musical tones.

Finally, a technique for storing, for example, sine wave information in a waveform memory, changing this sine wave information as appropriate, and reading it out as different waveform information was disclosed in %Open Circuit No. 54-61511 or Japanese Patent Application Laid-Open No. 59-111515. Disclosed.

According to this prior art, when accessing the waveform memory, it is possible to appropriately convert and read out waveform information different from the stored waveform information, and to generate musical tones based on the read waveform information.

However, this type of conventional technology is inconvenient because it is not possible to understand the shape of the waveform determined by the converted waveform information.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and is capable of appropriately converting and reading out waveform information different from the waveform information stored from the waveform memory, and displaying the converted waveform information in a visible manner. The purpose is to provide electronic musical instruments with

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. ◎ Figure 8g1 shows its configuration, and reference numeral 1 is a keyboard, which has [& performance keys for each scale. There is. The key assigner 2 sends a key scan signal to the keyboard 1, converts the resulting key operation signal into a key code, and stores it in the key code register 3 of one of the eight channels, for example.

The key code register 3 sends the stored key code to the frequency memory 4, for example, in a time-division manner.

The frequency memory 4 stores frequency information corresponding to each scale, and eight channels of frequency information are output in a time-division manner. In the drawing, this frequency information is indicated as F. Then, this frequency information F is supplied to the Akinimure digital filter 5, which performs an accumulation operation according to a clock of a predetermined frequency, and the accumulation information @4-F. Become. This accumulator 5 is also 8 in the same way as the key code register 3 mentioned above.
Performs channel time division processing.

The output of the accumulator 5 is then supplied to the non-linear conversion RAM 6. The non-linear conversion ratio AM6 receives waveform information from a waveform information input device such as the digitizer 7 under the control of the non-linear conversion RAM controller 8. It is written according to the following.

That is, the nonlinear conversion RAM control unit 8
Its operation is defined by the control signal of U, and while giving an address signal to the address input terminal AD of the nonlinear conversion ratio AM6, waveform information is supplied to the data input/output terminal DATA, and the write signal R/W is sent to this address input terminal AD. The output frame F (i.e., address signal) of the accumulator 5 is supplied to the address input terminal of the nonlinear conversion RAM 6 when its contents are read, and the stored waveform information is read from the data input/output terminal DATA. . At this time, the read signal W/W is applied to the nonlinear conversion RAM 6.

The information (that is, the conversion address signal) output from this nonlinear conversion ratio AM6 is given to the waveform memory 9 in which, for example, sine wave waveform information is stored, and the waveform information is divided into eight channels in a time-division manner. Output.

The output of this waveform memory 9 is supplied to a multiplier lO via a gate Gl, and is multiplied by the output of an envelope a control circuit 11 which outputs envelope information for eight channels in a time-sharing manner under the control of a key assigner 2. In the audio system 12, digital/analog conversion is performed and the signal is converted into an audio signal. Further, the waveform information read from the waveform memory 9 is supplied to the display device 13 via the game G2, and the outputted waveform information is displayed.The display device 13 is of a dot matrix type. A liquid crystal display device etc. can be used. Above game) Gl
Then, a switching control signal is given to G2 from the nonlinear conversion RAM control section 8. Game) GIK is
A switching control signal inverted by an inverter 14 is applied.

Next, the operation of this embodiment will be explained.

First, the performer uses the digitizer 7 to set desired waveform information in the nonlinear conversion filter AM6 prior to playing. For example, as shown in the left column of (A) in Figure 2, from O to 2π
Draw a straight line within the range. Therefore, corresponding to that straight line, 0
In this case, one key operation is performed on the keyboard l, and the frequency information F corresponding to that scale is obtained.
Therefore, the stored waveform information, that is, the waveform information representing the sine wave, is output from the waveform memory 9 as shown in the right column of FIG. 2(A). do.

The step speed of the address changes depending on when the address is taken.

That is, in that case, the waveform is output with distortion as shown on the right side of -%K 2 m (B).

Similarly, when waveform information is set from the digitizer 7 to the nonlinear conversion module AM6 as shown in the left column of FIG.

In addition, a sine wave (y=o r
+rsinx), the non-linearly converted waveform (y=
sin(π+π51nx)) is obtained.

As described above, when the performer manually inputs an arbitrary waveform into the nonlinear conversion AM 6 using the digitizer 7, the original address signal is nonlinearly converted according to this waveform, a converted address signal is obtained, and this converted address signal Since the waveform memory 9 is accessed based on this, an arbitrary waveform different from the original waveform can be obtained, and therefore musical tones of various tones can be easily generated.

When generating musical tones, the non-linear conversion filter AM
From the control circuit mW, 8, the switching signal @o# is applied to the inverter 14, and after being inverted, is supplied to the gate (Gl), so that the waveform information is supplied from the waveform memory 9 to the multiplier 10.

On the other hand, when writing desired waveform information into the non-linear conversion AM5 using the digitizer 7, the address signal is converted based on the written waveform information and is supplied to the waveform memory 9. , the output from the waveform memory 9 is sent to the display device 13 via the gate G28. Then, ``1'' signal is applied to G2, and 10 is applied to Gl.
A″ signal is supplied from the RAM control unit 8 for nonlinear conversion.

That is, at this time, address signals are sequentially supplied from the non-linear conversion RAM control section 8 to the address input terminals of the non-linear conversion RAM 6, and the resulting converted address signals are supplied to the waveform memory 9, and each The sample value of the address point is sent to the display device wi13 via the game) G2,
Waveform information will be displayed.

That is, in the case of FIGS. 2(A) to 2(D), the waveforms shown in the right column are visible on the display device 1113, and it is easy to see what waveform shape the musical tone is being obtained. person becomes visible.

f, K O. The circuit means for appropriately converting the stored contents of the waveform memory 9 and reading out waveform information different from the stored waveform information may be of various types.
The present invention is not limited to the embodiment described above. In the embodiment described above, the player inputs a desired waveform using the digitizer 7, but various character/graphic input devices may be used. For example, by linking a computer such as a personal combiator with an electronic musical instrument, the input device of the computer can be used for non-#iI type conversion.
It can be used for setting waveform information to M5.

Further, the CPU may write the waveform information into the non-linear conversion RAM 6 in accordance with the timbre selection. Partly, the CPU stores a plurality of waveform patterns in advance,
It is only necessary to selectively write it into the nonlinear conversion RAM 5.

C Effects of the Invention As detailed above, the present invention appropriately converts and reads out waveform information different from the waveform information stored from the waveform memory, and displays the converted waveform information in a visible manner. This makes it easy to understand the correspondence between the actual output musical tone and the waveform shape, which is convenient.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a circuit configuration diagram thereof, and FIG. 2 is a waveform diagram for explaining its operating state. ... Accumulator, 6 ... RAM for nonlinear conversion. 7... Digitizer, 9... Waveform memory, 13... Display device.

Claims (2)

[Claims] (1) Waveform memory means for storing predetermined waveform information, reading means for appropriately converting the waveform information into waveform information different from the stored waveform information and reading it out from the waveform memory means, and this reading means and musical tone generating means for generating a musical tone based on the converted waveform information read out by the reading means, further comprising a display means for visually displaying the converted waveform information read out by the reading means. An electronic musical instrument characterized by the following features: (2) a waveform memory means that stores predetermined waveform information; an address signal generation means that generates an address signal at a speed corresponding to the frequency of the musical tone to be generated; a memory means for nonlinear transformation; and this nonlinear transformation. writing means for writing desired waveform information into the memory means for non-linear conversion, and supplying the address signal generated by the address signal generating means to the memory means for nonlinear conversion, means for converting and supplying the converted address signal to the waveform memory means, accessing the predetermined waveform information using the converted address signal to obtain the waveform information, and generating and outputting musical tones; and from the memory means for nonlinear conversion. An electronic musical instrument comprising display means for displaying waveform information accessed by the output converted address signal and output from the waveform memory means.