JPH0785199B2 - Sound source device - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a sound source device used in an electronic musical instrument or the like capable of ensemble performance.

[Prior art and its problems]

2. Description of the Related Art Conventionally, there is known an electronic musical instrument capable of performing ensemble performance by simultaneously generating a plurality of musical tones such as tone colors based on the operation of one key.

However, in a sound source device used in such an electronic musical instrument, in order to obtain waveforms having different timbres, for example, preset waveforms having different shapes are selected, and a plurality of waveforms are simultaneously generated. Therefore, there is a problem that a plurality of waveform memories are required.

Further, the sound source waveform is stored in a fixed manner, and it is not interesting that the performer can freely take various waveforms and is not interesting.

[Object of the Invention]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sound source device used for an electronic musical instrument or the like that can perform ensemble performance by simultaneously performing different non-linear conversions of the contents of a waveform memory and performing simultaneous reading. To do.

[Main points of the invention]

According to the present invention, the address signal generated by the address signal generating means is non-linearly converted by a plurality of non-linear conversion memory means having different storage contents, and a plurality of converted address signals are given to the waveform memory means to obtain a plurality of desired waveform information. Then, it is possible to simultaneously generate musical tones based on this and perform the ensemble performance.

〔Example〕

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

FIG. 1 shows the configuration thereof, and reference numeral 1 denotes a keyboard, which has 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 the key code register 3 of any of the eight channels, for example.

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

The frequency memory 4 stores frequency information corresponding to each scale, and the frequency information of 8 channels is output in a time division manner. Now, in the drawing, this frequency information is described as F.

Then, the frequency information F is supplied to the accumulator 5 that performs the accumulation operation according to the clock of the predetermined frequency, and becomes the accumulation information qF. This accumulator 5 also performs the time-division processing of 8 channels like the key code register 3 described above.

The output of the accumulator 5 is supplied to the two non-linear conversion RAMs 6A and 6B. RAM6 for this nonlinear conversion
The waveform information from the waveform information input device such as the digitizer 7 is written in A and 6B under the control of the RAM controller 8 for nonlinear conversion.

That is, the operation of the non-linear conversion RAM control unit 8 is defined by the control signal of the CPU (not shown), and the non-linear conversion RAM 6
While supplying the address signal to the address input terminals AD of A and 6B, the waveform information is supplied to the data input / output terminal DATA, and the write signal is supplied.
R / W is sent out, and the waveform information input by the player operating the digitizer 7 is set prior to playing. That is, different waveform information can be reset in the non-linear conversion RAMs 6A and 6B by using the digitizer 7.

The address input terminal AD of this non-linear conversion RAM 6A, 6B is
Output of accumulator 5 qF when reading the contents
(That is, address signal) is supplied, and its data input / output terminal
The stored waveform information is read from DATA. At this time, the read signal R / W is applied to the non-linear conversion RAMs 6A and 6B.

Then, the different information (that is, a plurality of conversion address signals) output from the non-linear conversion RAMs 6A and 6B is given to a waveform memory 9 in which, for example, sine wave waveform information is stored, and the waveform information is Channels are output on a time-division basis. The output of the non-linear conversion RAM 6A is supplied to the waveform memory 9 via the gate G1, and the output of the non-linear conversion RAM 6B is supplied to the waveform memory 9 via the gate G2. The gates G1 and G2 are opened only when the clocks ψ _A and ψ _B are supplied.

An output of the waveform memory 9 is supplied to a multiplier 10 and an envelope control circuit for outputting envelope information of 8 channels × 2 minutes in a time division manner under the control of the key assigner 2.
It is multiplied by the output of 11 and digitalized in the sound system 12.
Analog conversion is performed, and two musical tones are output in pairs.

Next, the operation of this embodiment will be described.

First, the performer sets different desired waveform information in the non-linear conversion RAM 6A and the non-linear conversion RAM 6B 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 the range of 0 to 2π. Therefore, an output of 0 to 2π is obtained corresponding to the straight line. It is assumed that such a waveform is set in the non-linear conversion RAM 6A.

In this case, one key operation is performed on the keyboard 1,
The frequency information F corresponding to the scale is the accumulator 5
When the address signal (qF) is accumulated in, and applied to the non-linear conversion RAM 6A, the address signal (qF) is output as a straight line (without any conversion).

Therefore, the stored waveform information, that is, the waveform information expressing the sine wave, is output from the waveform memory 9 as shown in the right column of FIG. 2 (A).

Similarly, when the polygonal line shown in the left column of FIG. 2 (B) is input, the sidewalk speed of the address changes when the address signal (qF) takes exactly 3 / 4π. That is, in that case, the waveform is distorted and output as shown in the right column of FIG.

Similarly, when the waveform information is set from the digitizer 7 to the non-linear conversion RAM 6A as shown in the left column of FIG. 2C, the waveform information as shown in the right column is output from the waveform memory 9.

In addition, a sine wave (y = π + πsinx) is sent to the RAM for nonlinear conversion.
, The waveform memory 9 is set as shown in FIG.
A waveform y = sin (π + πsinx)) obtained by nonlinear conversion is obtained from

As described above, when the performer inputs an arbitrary waveform to the non-linear conversion RAM 6A by the digitizer 7, the original address signal is non-linearly converted according to this waveform, and the converted address signal is obtained. Since the waveform memory 9 is accessed on the basis of the signal, an arbitrary waveform different from the original waveform can be obtained, so that musical tones of various tones can be easily generated.

Similarly, a desired waveform is set in the non-linear conversion RAM 6B by using the digitizer 7. Therefore, as in the case of the non-linear conversion RAM 6A described above, the address signal supplied from the accumulator 5 is converted according to the stored contents and applied to the waveform memory 9 as a converted address signal. Become.

By the way, as shown in FIG. 3, in this embodiment, eight tones are simultaneously generated by time division processing of eight channels, but the clocks ψ _A and ψ _B divide each channel time into two. It is a thing. Therefore, the output of the non-linear conversion RAM 6A is applied to the waveform memory 9 via the gate G1 at the output timing of the clock ψ _A ,
The output of the non-linear conversion RAM 6B is applied to the waveform memory 9 via the gate G2 at the output timing of the clock ψ _B.

Then, the two pieces of waveform information for each channel read from the waveform memory 9 are multiplied by different envelope information (see the column of the envelope information in FIG. 3) sent from the envelope control circuit 11 in the multiplier 10, Sound system
It is sent to 12 and converted into an acoustic signal.

As described above, in the present embodiment, the desired different waveforms are set respectively in the non-linear conversion RAMs 6A and 6B, and the conversion address signals are obtained from the respective waveforms and applied to the waveform memory 9 in a time division manner. The single waveform memory 9 can output a plurality of different waveform information.

In addition, two envelope information is generated from the envelope control circuit 11 for each channel, two envelopes are independently controlled for two different waveforms, two musical tones are generated, and the musical tones are simultaneously generated to perform the ensemble performance. Therefore, the mixing ratio of the two musical tones is defined by the envelope information and changes with time, and an effective ensemble performance can be realized.

Although only one waveform memory 9 is provided in the above embodiment, a plurality of waveform memories 9 may be provided corresponding to the nonlinear conversion RAMs 6A and 6B.

Further, in the above-mentioned embodiment, the envelopes of two musical tones generated at the same time are different, but the same envelope may be added.

Further, in the above embodiment, the two non-linear conversion RAMs 6A and 6B are provided, but the number may be three or more.

In addition, in the above embodiment, the player inputs a desired waveform with the digitizer 7, but various character / graphic input devices can be used. For example, a calculator such as a personal computer and an electronic musical instrument can be interlocked, and the input device of the calculator can be used for setting waveform information to the RAM 6A, 6B for nonlinear conversion.

The waveform information may be written in the non-linear conversion RAMs 6A and 6B by the CPU in accordance with the tone color selection. That is, the CPU may store a plurality of waveform patterns in advance and selectively write the waveform patterns in the non-linear conversion RAMs 6A and 6B.

〔The invention's effect〕

As described in detail above, according to the present invention, the address signal generated by the address signal generating means is subjected to different nonlinear conversions by a plurality of rewritable memory means for nonlinear conversion to obtain a plurality of converted address signals. Accordingly, since the waveform memory means is accessed and musical tones based on this are simultaneously generated to perform the ensemble performance, there is an advantage that the ensemble performance with various tone colors can be realized with a simple configuration.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a circuit configuration diagram thereof, FIG. 2 is a waveform diagram for explaining its operating state,
FIG. 3 is a diagram showing the time chart. 4 ... Frequency memory, 5 ... Akinumerator, 6A, 6
B: Non-linear conversion RAM, 7 ... Digitizer, 9 ... Waveform memory.

Claims (1)

[Claims] 1. A waveform memory means for storing predetermined waveform information, an address signal generating means for generating an address signal at a speed corresponding to a frequency of a musical tone to be generated, and a plurality of memory means for non-linear conversion. Writing means for writing desired different waveform information to the plurality of memory means for non-linear conversion, and the address signal generated by the address signal generating means are supplied to the plurality of memory means for non-linear conversion. And converting the written waveform information to supply a plurality of converted address signals to the waveform memory means, and accessing the predetermined waveform information by the plurality of converted address signals, and means for accessing the same. Means for simultaneously generating musical tones based on a plurality of waveform information read from the waveform memory means to perform an ensemble performance. Tone generator.