A triangle sound simulating device to be employed in an electronic musical instrument is composed of a fundamental sound signal oscillator, at least one additional sound signal oscillator for generating an additional sound signal of lower frequency than that of the fundamental sound frequency, the output level of the additional sound signal being selected to be lower than the output level of the fundamental sound signal obtained from the fundamental sound signal oscillator, and a switching circuit of nonlinear characteristic which, upon reception of the output signals can create a difference frequency sound signal of a frequency equal to the difference between those of the output signals each time the switching circuit is switched.
This design relates to an electronic device for simulating the sounds generated from musical triangles. In electronic musical instruments, by employing combinations of active circuit elements such as electron tubes and transistors and passive circuit elements such as resistors, capacitors, and inductors, various circuits are combined to constitute sound effect generators which simulate sounds of various kinds of natural musical instruments.
Although it is comparatively easy to obtain electronic devices for simulating artificially, sounds generated from string musical instruments and wind instruments, the sounds of percussion instruments which are more complicated have not been successfully simulated with sufficient naturalness of auditory sensation.
Conventional devices for simulating percussion instruments, more specifically the sound of a triangle, have been composed of merely a single oscillator and a tone-color circuit for shaping the output of the oscillator. However, because merely a fundamental frequency and some of the higher harmonics thereof are generated from the single oscillator, the sound thus simulated by such an arrangement of the circuit is too simple and lacks naturalness in auditory sensation, although the organization thereof is simple and thereby advantageous.
Therefore, the primary object of the present design is to provide a device for simulating the natural sound of a triangle whereby the above described drawbacks of the conventional sound simulating devices can be substantially eliminated.
Another object of the present design is to provide a novel device for simulating the sound of a triangle which can generate a sound far closer to the natural sound of a triangle.
Still another object of the present design is to provide a novel device for simulating the sound of a triangle which is simple in organization and can be easily produced. These and other objects of the present design can be achieved by a novel device for simulating the sound of a triangle which comprises an oscillator for generating a fundamental sound signal, at least one additional sound oscillator for generating an additional sound signal having a lower frequency than that of the fundamental sound signal, and a switching circuit of nonlinear characteristic which can receive all of the above mentioned fundamental and additional signals simultaneously and create sound signal having frequencies equal to the differences between the frequencies of these signals, the sound level of the additional sound signal being selected to be at a lower level than that of the fundamental sound signal.
The nature, principle, and utility of the present design will be more clearly understood from the following detailed description with reference to the accompanying drawing.
Referring now to FIG. 1 which shows a basic concept of the present design, the device shown comprises an oscillator 1 for generating a fundamental sound signal having a frequency f1, an additional sound oscillator 2 for generating an additional sound signal having a frequency f2 lower than the frequency f1 of the fundamental sound signal, a switching circuit 3, and a tone-color circuit 4.
With the above described organization of the simulating device of a triangle sound, the output of the fundamental sound oscillator 1 of the frequency f1 and the output of the additional sound oscillator 2 of the frequency f2 are mixed at an appropriate level ratio before entering a switching circuit 3 and the output thus obtained is applied to the tone-color circuit 4.
The switching circuit 3 is one having a nonlinear characteristic represented for example, by a curved gain, and may exhibit a saturation and a class C amplification as is inherent with such nonlinearly operated devices, a difference sound signal is produced by same having a frequency equal to the difference between f1 of the fundamental sound signal and f2 of the additional sound signal.
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