JPH0414792Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a musical tone generator that generates musical tones, etc. whose height and volume change according to the movement of a conductor's baton.

<Prior art> The inventor of the present invention previously disclosed in Japanese Utility Model Application Publication No. 57-84593 that the movement of a light-emitting element attached to the tip of a baton is expressed on an X-Y coordinate using a two-dimensional conversion light-receiving element. The sound source signal is frequency-modulated and amplitude-modulated by the X-axis and Y-axis coordinate voltage signals output from the two-dimensional conversion light-receiving element, and the height and the amplitude are modulated according to the movement of the baton. We proposed a musical tone generator that generates musical tones that vary in size.

<Problems to be solved by the invention> However, in the conventional musical tone generator mentioned above, the sound only changes continuously in high and low or large and small according to the movement of the baton, and the generated sound becomes monotonous. There was a problem with not being able to make the sound interesting enough.

<Means for Solving the Problems> The present invention has been made in consideration of the above points, and solves the above problems by having the following configuration.

That is, the musical tone generator of the present invention includes a plurality of light emitting elements attached to the tip of a conductor's baton, a drive circuit that sequentially drives the light emitting elements in a time-division manner, and a system that receives light from the light emitting elements through an optical system. A two-dimensional conversion light-receiving element that generates coordinate voltage signals V _x and V _y corresponding to the coordinates of the X and Y axes, and a sound source signal that receives one of the amplified coordinate voltage signals and is frequency-modulated by this coordinate voltage signal. A voltage controlled oscillator circuit that outputs the sound source signal, and a voltage controlled amplifier circuit that inputs this sound source signal and the other coordinate voltage signal, amplitude modulates the sound source signal using the coordinate voltage signal, and outputs the resultant sound source signal.

As a result, musical tones that change in height and volume according to the movement of the conductor's baton are generated at regular intervals, making it possible to create light and diverse sounds.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

Figure 1 shows a configuration diagram of a musical tone generator. 1 is a baton, and at its tip is a light emitting element 2 such as an LED.
Three are installed at appropriate intervals. 12 is 3
This is a drive circuit that sequentially drives the light emitting elements 2 in a time-division manner, and as shown in FIG. let 3 is a two-dimensional conversion light-receiving element that is arranged on the X-Y coordinates of the photodiodes and outputs coordinate voltage signals V _x and V _y corresponding to the X-axis and Y-axis coordinates of the light spot projected on the surface of the photodiode. The light emitted from the light emitting element 2 at the tip of the baton 1 is projected onto the two-dimensional conversion light receiving element 3 via the convex lens 4 and filter 5 of the optical system. 6
is a voltage controlled oscillation circuit connected to the Y-axis output circuit of the two-dimensional conversion light-receiving element 3 via an amplifier 7, which oscillates a sound source signal of a frequency modulated by the Y-axis coordinate voltage signal _Vy . 9 is a voltage controlled amplifier circuit connected to the output side of the voltage controlled oscillation circuit 6, which inputs the coordinate voltage signal V _x outputted from the X-axis output circuit of the two-dimensional conversion light receiving element 3 via the amplifier 8, It is connected so that the sound source signal sent from the controlled oscillation circuit 6 is amplitude-modulated by the X-axis coordinate voltage signal V _x and this output signal is sent to the speaker 10 .

Next, the operation of the musical tone generator having the above configuration will be explained. First, the driving circuit 12 applies time-division pulse signals P1, P2, and P3 shown in FIG. When shaken, the light from the three light-emitting elements 2 is sequentially projected onto the two-dimensional conversion light-receiving element 3 through the optical system, and these light spots travel three types of trajectories in a time-sharing manner as shown in Figure 2. Form. Then, from the two-dimensional conversion light receiving element 3 to the third
Coordinate voltage signals V _x and V _y as shown in the figure are output, respectively, and the Y-axis coordinate voltage signal V _y is amplified by an amplifier 7 and then applied to a voltage controlled oscillation circuit 6.
The X-axis coordinate voltage signal V _x is amplified by an amplifier 8,
The signal is sent to the voltage control amplifier circuit 9. The voltage controlled oscillation circuit 6 outputs a sound source signal frequency modulated by the coordinate voltage signal V _y , and this sound source signal is sent to the voltage controlled amplifier circuit 9. In the voltage control amplifier circuit 9, the sound source signal is amplitude-modulated by the coordinate voltage signal _Vx , and the output is sent to the speaker 10 to generate sound. The height and size of this sound change according to the movement of the tip of the baton 1, but in addition, the three light emitting elements 2 are sequentially driven in a time division manner, and each light point is focused on the two-dimensional conversion light receiving element 3. Because they change discontinuously, the coordinate voltage signals V _x and V _y change discontinuously at intervals of time t, and a sound whose height and volume slightly change is generated every time t.

Therefore, by adjusting the movement of the baton 1, it is possible to create a musical sound with a specific frequency, and by changing the size and pitch of the musical sound at regular intervals, it is possible to create light and diverse sounds. can be done.

Note that any number of light emitting elements 2 may be attached to the tip of the baton 1 as long as they are plural, and the X-axis coordinate voltage signal V _x is used for frequency modulation, and the Y-axis coordinate voltage signal V _y is used for amplitude modulation. It can also be used for

<Effects of the invention> As explained above, according to the musical tone generator of the invention, a plurality of light emitting elements provided at the tip of the baton are sequentially driven in a time division manner, and the movement of these light emitting elements is converted into a two-dimensional light receiving element. The coordinate voltage signal V _x ,
V _y is created, and the sound source signal is frequency-modulated and amplitude-modulated using two voltage signals to generate musical tones, etc., so the height and size can be easily adjusted by simply shaking the conductor's baton. It is possible to generate different sounds, and by changing the pitch and volume of the sound at regular intervals, it is possible to create light and diverse sounds.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention. Fig. 1 is a block diagram of a musical tone generator, Fig. 2 is a locus of a light spot on a two-dimensional conversion light-receiving element, and Fig. 3 is a coordinate voltage signal V _x , V _y voltage waveform diagram, and FIG. 4 is a timing chart of the drive circuit. 1... Conductor's baton, 2... Light emitting element, 3... Two-dimensional conversion light receiving element, 6... Voltage controlled oscillation circuit, 9...
Voltage control amplifier circuit, 12... drive circuit.

Claims (1)

[Scope of utility model registration request] A plurality of light emitting elements attached to the tip of the display rod, a drive circuit that sequentially drives the light emitting elements in a time division manner, and light from the light emitting elements is received via an optical system and corresponds to the coordinates of the X and Y axes. a two-dimensional conversion light receiving element that generates coordinate voltage signals V _x and V _y ; a voltage controlled oscillation circuit that receives one of the amplified coordinate voltage signals and outputs a sound source signal frequency-modulated by the coordinate voltage signal; A musical tone generator comprising: a voltage control amplifier circuit which inputs the tone source signal and the other coordinate voltage signal, amplitude modulates the tone source signal using the coordinate voltage signal, and outputs the amplitude modulated signal.