JP2615545B2 - Electronic musical instrument - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electronic musical instrument.

[Conventional technology and its problems]

Conventionally, predetermined waveform information is stored in a waveform memory,
It is read out at a speed corresponding to the scale, and is used as waveform information of a musical tone.

A technique of storing sine wave information in a waveform memory and reading out the sine wave information as different waveform information by appropriately changing the sine wave information is disclosed in Japanese Patent Application Laid-Open No.
No. 9-111515.

For example, the technique described in Japanese Patent Application Laid-Open No. 54-61511 discloses a technique in which waveform data is read from a waveform memory as a read address using an accumulated value obtained by repeatedly accumulating frequency information corresponding to a designated pitch at a constant rate. An electronic musical instrument that forms musical tones, in particular, by changing the value of frequency information that is repeatedly accumulated to change the read address stepping speed non-linearly, thereby enabling various waveforms to be read from the waveform memory. It is.

By the way, in this type of technology, since a read address is generated by repeatedly accumulating frequency information at a constant rate, a variety of read modes are realized, such as generating a non-linear address such as reading a waveform memory in reverse. It is impossible to do. Further, in this type of technique, various waveforms are read from the waveform memory, but it is inconvenient because the shape of the waveform cannot be understood.

[Object of the invention]

The present invention has been made in view of the above circumstances, and in addition to reading out a waveform from a waveform memory in a variety of readout forms, displaying the readout waveform in a visible manner, and comparing the tone color of the generated musical tone with the shape of the waveform. It is an object of the present invention to provide an electronic musical instrument that can make the correspondence clear at a glance.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the configuration, wherein reference numeral 1 denotes a keyboard having a plurality of performance keys for each scale. 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, for example, the key code register 3 of any one of eight channels.

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

The frequency memory 4 stores frequency information corresponding to each scale, and frequency information of eight channels is output in a time-division manner. In the drawing, this frequency information is
It is described.

The frequency information F is supplied to the accumulator 5 that performs an accumulation operation in accordance with a clock of a predetermined frequency, and becomes accumulation information qF. The accumulator 5 also performs time-division processing for eight channels, similarly to the key code register 3 described above.

The output of the accumulator 5 is supplied to the non-linear conversion RAM 6. Position information from an input device such as a digitizer 7 is written into the non-linear conversion RAM 6 under the control of the non-linear conversion RAM control unit 8. The phase information referred to here is information for variably controlling the step speed and the step direction of the accumulated information qF (address signal) output from the accumulator 5.

That is, the operation of the non-linear conversion RAM control unit 8 is regulated in accordance with a control signal supplied from a CPU (not shown), and the phase control is performed while giving an address signal qF to an address input terminal AD of the non-linear conversion RAM. The data input / output terminal DA
The digital signal is supplied to the TA, and a write signal R / W is sent out. The digitizer 7 operates the player to set the input phase information prior to the performance.

The address q of the accumulator 5 (that is, the address signal) is supplied to the address input terminal AD of the non-linear conversion RAM 6 when the content is read, and the stored phase information is read from the data input / output terminal DATA. At this time, the read signal R / W is applied to the non-linear conversion RAM 6.

The information (that is, the conversion address signal) output from the non-linear conversion RAM 6 is applied to a waveform memory 9 storing, for example, sine wave waveform information, and the waveform information is output in a time-division manner for eight channels. Let it.

The output of the waveform memory 9 is supplied to a multiplier 10 via a gate G1, and is multiplied by the output of an envelope control circuit 11 for outputting envelope information for eight channels in a time-sharing manner under the control of the key assigner 2, thereby obtaining an acoustic system. At 12, digital / analog conversion is performed and converted to an acoustic signal. The waveform information read from the waveform memory 9 is supplied to the display device 13 through the gate G2, and the output waveform information is displayed. As the display device 13, a dot matrix type liquid crystal display device or the like can be used. The gate G1 and the gate G2 are supplied with a switching control signal from the non-linear conversion RAM control unit 8. The switching control signal inverted by the inverter 14 is applied to the gate G1.

 Next, the operation of the present embodiment will be described.

First, the performer sets desired phase information in the non-linear conversion RAM 6 using the digitizer 7 prior to the performance. For example, as shown in the left column of FIG. 2A, a straight line is drawn in a range of 0 to 2π. Therefore, an output of 0 to 2π is obtained corresponding to the straight line.

In this case, when one key operation is performed on the keyboard 1 and the frequency information F corresponding to the scale is accumulated in the accumulator 5 to become an address signal (qF), which is applied to the non-linear conversion RAM 6. Address signal (qF)
Is output directly (without any conversion). Therefore, the stored waveform information, that is, the waveform information expressing the sine wave is shown in the right column of FIG. Output as

Next, the case of FIG. 2 (B) will be described. Here, the horizontal axis of the graph shown in the left column is the address signal qF,
The vertical axis corresponds to the converted address signal y converted by the phase information input via the digitizer 7. As is clear from this figure, the conversion address signal y becomes 2 · qF when 0 ≦ qF ≦ 3π / 4, and the conversion address signal y becomes 2 · qF / 5 + 6/5 when 3π / 4 ≦ qF ≦ 2π. That is, a converted address signal y whose stepping speed changes nonlinearly in a polygonal manner at the phase 3π / 4 is obtained, and the waveform information shown in the right column of FIG. Waveform memory 9
Is read from.

FIG. 2C shows an example in which the stepping direction is made different in a designated phase section. That is, as is clear from the graph on the left column of FIG. 3C, the address signal y is converted to the address reverse order at the phases π / 2 and π of the address signal qF. The waveform information shown in the column is read from the waveform memory 9.

FIG. 2D shows an example in which the stepping direction and the stepping direction are changed. In this example, the converted address signal y obtained by converting the address signal qF with a sine wave (π + πsinx).
Have gained. Then, from the converted address signal y, the waveform information shown in the right column of FIG.

As described above, when the performer inputs an arbitrary waveform to the non-linear conversion RAM 6 at the digitizer 7, the original address signal is non-linearly converted according to this waveform, and a converted address signal is obtained. Since the waveform memory 9 is accessed based on the waveform, an arbitrary waveform different from the original waveform can be obtained, so that it is possible to easily generate musical sounds of various timbres.

When generating musical tones, the above-mentioned non-linear conversion RAM
The switching signal “0” is supplied from the control unit 8 to the inverter 14, inverted and supplied to the gate G 1, so that the waveform information is supplied from the waveform memory 9 to the multiplier 10.

On the other hand, when writing desired phase information into the non-linear conversion RAM 6 using the digitizer 7, the address signal is converted based on the written phase information and supplied to the waveform memory 9, The output from the waveform memory 9 is sent to the display device 13 via the gate G2. Then, a "1" signal is supplied to the gate G2, and a "0" signal is supplied to the gate G1 from the non-linear conversion RAM control unit 8.

That is, at this time, the address signal is sequentially supplied from the non-linear conversion RAM control unit 8 to the address input terminal AD of the non-linear conversion RAM 6, and the conversion address signal obtained as a result is supplied to the waveform memory 9 and the The sample value is sent to the display device 13 via the gate G2, and the waveform information is displayed.

In other words, in the case of FIGS. 2 (A) to 2 (D), the waveforms as described in the right column can be visually recognized on the display device 13, and it is easy to play in accordance with the shape of the waveform in which the musical tone is obtained. Can be visually recognized.

The circuit means for appropriately converting the stored content from the waveform memory 9 and reading out the waveform information different from the stored waveform information may be of various types, and is not limited to the above embodiment. .

In the above embodiment, the performer inputs a desired waveform by the digitizer 7, but various character / graphic input devices can be used. For example, it is possible to link a computer such as a personal computer with an electronic musical instrument and use the input device of the computer for setting phase information in the RAM 6 for nonlinear conversion.

Writing waveform information to the nonlinear conversion RAM 6
The CPU may perform the processing in accordance with the tone color selection. That is, C
The PU may store a plurality of waveform patterns in advance and selectively write them into the nonlinear conversion RAM 6.

〔The invention's effect〕

As described in detail above, according to the present invention, the phase information stored in the translation address generation means is rewritten in various ways in accordance with a user's instruction, for example, the step speed is changed and stored in the waveform memory. A conversion address signal that realizes various reading modes, such as reading waveform information non-linearly or reversely reading waveform information from a waveform memory by changing the stepping direction, is obtained, and is generated based on such a conversion address signal. The correspondence between the timbre of a musical tone and the shape of its waveform can be clearly seen.

[Brief description of the drawings]

1 shows an embodiment of the present invention, FIG. 1 is a circuit diagram thereof, and FIG. 2 is a waveform diagram for explaining an operation state thereof. 4 ... frequency memory, 5 ... accumulator, 6 ... non-linear conversion RAM, 7 ... digitizer, 9 ... waveform memory, 13 ... display device.

Claims (1)

(57) [Claims] 1. An address signal generating means for generating an address signal having a stepping speed corresponding to a pitch of a musical tone to be generated, and a phase for generating phase information designating a stepping speed and a stepping direction of the address signal. Information generating means for storing phase information generated by the phase information generating means, and variably controlling a stepping speed and a stepping direction of the address signal according to the phase information to generate a conversion address signal; A waveform memory for storing predetermined waveform information; a tone forming means for reading the waveform information stored in the waveform memory in accordance with the conversion address signal to form a musical tone; and a waveform memory in response to the conversion address signal. An electronic musical instrument comprising: waveform display means for displaying read-out waveform information.