JPS644157Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an electronic musical instrument, and particularly to one that can obtain a tone close to that of an actual musical instrument.

(Conventional example) Electronic musical instruments are generally configured to produce tones that imitate existing musical instrument sounds, such as piano tones, but as is well known, periodic functions are used to generate sounds that imitate musical instrument sounds. It is necessary to set the same waveform and also set the envelope, that is, the output level on the time axis, to be the same. As shown in Figure 1, the envelope can be expressed on a plane showing time T and level L, with attack A showing the rise of the sound, decay D showing the state of decay from attack A, and comparison of the attenuation rate of the sound. It consists of a gentle sustain S and a release R, which indicates a state in which the sound fades away. This envelope differs depending on the instrument; in wind instruments, attack A is generally gentle and can maintain a certain level even after that, resulting in a graph without much ups and downs, but in the sound of musical instruments such as pianos, attack A is prominent. After that, the graph shows a gradual attenuation. Figures 2 and 3 are graphs showing the envelope of a piano. Figure 2 shows the characteristics of the bass side, and Figure 3 shows the characteristics of the treble side. Due to the nature of stringed instruments, the bass side changes from attack A to release R. It takes a long time to reach the treble, and the time becomes shorter for the higher notes. It is known that the relationship between pitch and time is that for each octave higher, the time increases approximately 1/√2 times, and in reality, the decay time differs for each key.

However, in conventional electronic musical instruments, the envelope was common throughout the entire range, so if the envelope was set to produce a sound close to the real thing in the low range, the decay time would be too long in the high range. If it were the other way around, the decay time on the low frequency side would become too short, resulting in an unnatural tone.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic musical instrument that eliminates the above-mentioned drawbacks of the conventional electronic musical instrument and provides an envelope close to that of an actual musical instrument.

(Configuration of the present invention) The configuration of the present invention includes a clock oscillator as a sound source,
A selector provided at the subsequent stage that can select an arbitrary pitch, a first counter provided at the subsequent stage, a musical tone forming circuit provided at the subsequent stage, and a musical tone envelope provided at the subsequent stage of the musical tone forming circuit. an envelope multiplier circuit for setting the envelope multiplication circuit, a D/A converter for converting the digital signal from the envelope multiplier circuit into an analog signal, a second counter provided after the selector, and the second counter. an envelope memory provided after the counter for accommodating data to control the envelope of the envelope multiplication circuit; and an envelope memory for storing data to control the envelope of the envelope multiplication circuit; and a controller for synchronously controlling the.

(Example) An example of the present invention will be described based on FIGS. 4 and 5. In the figure, reference numeral 1 denotes a clock oscillator which is a sound source, and is designed to be able to output as many tones as the number of keys on a keyboard 2 at the same time. A selector 3 is provided after the clock oscillator 1, and is configured to selectively pass only musical tones of a desired pitch in response to a signal from a controller 4, which will be described later. 5 is a first counter provided after the selector 3; 6
7 is an envelope multiplication circuit for setting the envelope of the musical tone; and 8 is a D/A converter provided at the subsequent stage. Numeral 9 is a second counter provided after the selector 3, and 10 is an envelope memory provided after the counter 9, which stores data to control the envelope of the envelope multiplication circuit 7. The controller 4 is adapted to synchronously control the first counter 5 and the second counter 9 in response to a pitch designation signal designated by the keyboard 2.

To explain an example of the operation of the above-described configuration, when an appropriate key is pressed on the keyboard 2, the musical tone forming circuit 6 outputs a musical tone of a pitch corresponding to the key. On the other hand, the second counter 9 becomes clear the instant the key is pressed and starts counting the clock output from the clock oscillator 1. The envelope memory 10 has a second
An envelope as shown in the figure is stored in advance, and the address is determined by the pulse from the second counter.
Data DA for each AD is read out. Therefore, the read speed increases or decreases in proportion to the frequency of the clock output from the selector 3. The envelope multiplication circuit 7 multiplies the musical tone from the musical tone forming circuit 6 and the envelope data from the envelope memory 10, and outputs the result to the next stage D/A converter. The controller 4 operates to synchronize the first counter 5 and the second counter 9.

(Effects of the invention) According to the electronic musical instrument according to the invention, as is clear from the embodiments described above, when the keyboard 2 is pressed, the controller 4 controls the first counter 5 and the second counter 9. are cleared, and the clock signal selected corresponding to the pressed keyboard 2 is supplied to the first counter 5 and the second counter 9, so that one forms a musical tone and the other can function to form an envelope that determines attack to release.

Therefore, from the time when the keyboard 2 is pressed, musical tone formation and envelope formation can be synchronized, and the envelope time can be operated to change according to the pitch of the musical tone.

In this way, by varying the time from attack to release depending on the pitch, it is possible to obtain a tone that is closer to the sound of a musical tone.

[Brief explanation of the drawing]

Figure 1 is a graph to explain the envelope of the instrument sound, Figure 2 is a graph showing the envelope of the low range side of the piano, Figure 3 is a graph showing the envelope of the high range side of the piano, Figures 4 and 2 are graphs showing the envelope of the piano's high range side. FIG. 5 shows an embodiment of the electronic musical instrument according to the present invention, FIG. 4 is a block diagram, and FIG. 5 is a graph showing an envelope stored in an envelope memory. 1: clock oscillator, 2: keyboard, 3: selector, 4: controller, 5: first counter, 6: tone forming circuit, 7: envelope multiplication circuit, 8: D/A converter, 9: second counter, 10: Envelope memory.

Claims (1)

[Scope of utility model registration request] A clock oscillator as a sound source, a selector provided at the subsequent stage that can select an arbitrary pitch, a first counter provided at the subsequent stage, a musical tone forming circuit provided at the subsequent stage, and a subsequent stage of the musical tone forming circuit. an envelope multiplication circuit for setting an envelope of musical tones, a D/A converter for converting a digital signal from the envelope multiplication circuit into an analog signal, and a second counter provided at a stage subsequent to the selector. an envelope memory provided after the second counter and for storing data to control the envelope of the envelope multiplication circuit; and a first counter in response to a pitch designation signal designated by the keyboard. and a controller for synchronously controlling the second counter and the second counter.