JP3304151B2 - Electronic metronome - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic metronome.

[0002]

2. Description of the Related Art At present, as an alternative to the mechanical metronome conventionally used, an electronic metronome device excellent in accuracy and operation time is commercially available. Above all,
Using a crystal oscillator, the tact rod is driven by a step motor driven by the output pulse, and the output pulse is counted by a counter provided in a control circuit or the like, so that the tact sound is electrically synchronized with the tact rod. Are particularly excellent in terms of accuracy. However, this is to drive the tact rod at a constant speed, visually different from the maximum speed of the tact rod at the center of swing like a mechanical metronome, and used to the mechanical metronome The user feels strange.

[0003] For this reason, there are the following electronic metronomes which are excellent in accuracy and operation time and exhibit a tact swing operation similar to that of a mechanical metronome. This is an electronic metronome that uses a permanent magnet and a coil to send an electric signal to this coil to reciprocate the tact rod with an arbitrarily selected oscillation amplitude.
It is disclosed in JP-A-2-146988. As shown in FIG. 3A and FIG. 3B, which is a side view of FIG. 3A, a conventional mechanical metronome has a magnet 51a at its lower end and is mounted so as to be able to reciprocate right and left around a shaft 51b. Similarly, a tact rod 51 that can be set to a desired tempo by moving a tempo setting weight 51c up and down, a yoke 52 arranged to face the magnet 51a, and a search coil 53 wound around the yoke 52 And a driving coil 54, and alternately applies a voltage in the opposite direction to the driving coil 54 in accordance with a detection signal of the search coil 53.
The interaction between the magnetic field generated by the magnet 4 and the magnet 51a causes the tact rod 51 to reciprocate right and left. The maximum swing position of the tact rod 51 is shown in FIG.
And the dashed line in FIG. 3b.

[0004]

The former is capable of generating a tact sound with a high-precision cycle, but the tact bar swings unnaturally, and the latter is a tact bar swinging naturally. However, it has been difficult to generate a tact sound in synchronization with a time when the tact rod reaches a predetermined position deviated left and right from the swing center.

[0005] It is an object of the present invention to provide an electronic metronome that swings a tact stick in a natural motion and generates a tact sound accurately synchronized with the operation of the tact stick.

[0006]

According to an electronic metronome having a tact rod reciprocally swingable left and right, and a drive coil and / or a search coil for reciprocating the tact rod reciprocally right and left, the drive coil and / or the search coil may be provided. Receiving the search coil output, the tact rod reaches the swing center
And signal generating means for generating a signal synchronized with the time that receives the signal from the signal generating means, regarded as the tact rod reaches a predetermined position shifted to the left and right from the <br/> swing center
The above object is achieved by providing a sound generating means for generating a tact sound after a predetermined time from the generation of the signal .

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An electronic metronome according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory view showing the structure of the present embodiment, FIG. 1A is a front view of the present embodiment, FIG. 1B is a sectional view taken along the line AA of FIG. 1A, and FIG. The electric circuit diagram which shows a structure is shown. In the drawing, reference numeral 1 denotes a tact rod, which has a magnet 1a at a lower end, is mounted so as to be able to reciprocate right and left around a shaft 1b, and raises and lowers a tempo setting weight 1c like a conventional mechanical metronome. By doing so, a desired tempo can be set. Reference numeral 2 denotes a drive coil, which has a yoke 2a arranged so as to face the magnet 1a, generates a magnetic field, and causes the tact rod 1 to reciprocate right and left by interaction between the magnet 1a and the magnetic field. A search coil 3 is wound around the yoke 2a.

Next, the circuit configuration of this embodiment will be described with reference to FIG. In the figure, the same reference numerals as those in FIGS. 1A and 1B denote the same components as those in FIGS. 1A and 1B. In the figure, a driving coil 2, a search coil 3, a capacitor c1,
The capacitor c2 and the transistor Tr1 constitute a known driving circuit Y. The drive circuit Y has a configuration similar to that used for an electromagnetic pendulum or the like, and a capacitor c is driven by a current induced in the search coil 3 when the magnet 1a passes.
1 and the capacitor c2 are charged and discharged, the transistor Tr1 is opened and closed, and the voltage value applied to the drive coil 2 is controlled.

Reference numeral 4 denotes a comparison circuit which compares the voltage value at the terminal a with a predetermined threshold value Vth, and when the voltage value exceeds the threshold value, generates an output as shown in FIG. 2B. Reference numeral 5 denotes a monostable multivibrator, which receives an output of the comparison circuit 4 and generates a timing pulse for generating a tact sound at the falling edge. These comparison circuits 4
The monostable multivibrator 5 forms a signal generating means.

Reference numeral 6 denotes a sound generating circuit which receives the above timing pulse and generates a tact sound signal. A speaker 7 receives a tact sound signal and generates a tact sound. The sounding circuit 6 and the speaker 7 constitute sounding means.

Next, the operation of this embodiment configured as described above will be described.

The transistor Tr1 is turned on and off by an induced current generated in the search coil 3 due to the reciprocating swing of the tact rod 1, the drive current flows through the drive coil 2, and the drive coil 2 excites the yoke 2a to excite the tact rod. Maintain the reciprocating swing of As a result, the tact rod performs a pendulum motion like a conventional mechanical metronome.

At this time, due to the reciprocating swing of the tact rod, a change in potential appears at the terminal a as shown in FIG. 2 (a waveform diagram for explaining the operation of FIG. 1). This change in potential changes the pole between when the tact rod 1 swings and the magnet 1a approaches the drive coil 2 and when the magnet 1a moves away. Occurs when you reach the position you want. Further, the threshold value Vth is set near the pole change.
Is set. At this time, the comparison circuit 4 compares the potential of the terminal a with a predetermined threshold value Vth, and when the voltage value of the terminal a exceeds the threshold value Vth, it has a predetermined pulse width as shown in FIG. 2B. Generates an output pulse. With this pulse width, it takes time until the tact rod 1 deviates to some extent from the swing center. The monostable multivibrator 5 receiving this output pulse causes the falling of the output pulse to
A timing pulse for generating a tact sound is generated. The sounding circuit 6 receiving the timing pulse generates a tact sound signal (shown in FIG. 2C), and generates a tact sound by the speaker 7 receiving the tact sound signal.

As described above, the tact rod 1 swings, and a tact sound is generated every time the tact rod 1 is shifted left and right from the center of the swing. As described above, in this example, the movement of the tact rod is natural, and an electric metronome that can generate a tact sound in synchronization with the arrival of the tact rod at a predetermined position shifted left and right from the center of swing. It is.

In the above-described embodiment, the timing of generating the tact sound is determined by the change in the potential of the drive coil. However, the present invention is not limited to this, and the timing may be determined by the change in the potential of the search coil. In this case, in the above embodiment, the output of the terminal d is output to the comparison circuit 4.

[0017]

According to the present invention, a signal generating means for generating a synchronized signal when the tact rod reaches the swing center, and a sound generating means for receiving the output of the signal generating means and generating a tact sound after a predetermined time from the generation of the signal. With this arrangement, it is possible to provide an electronic metronome that swings the tact stick by natural movement and generates a tact sound that is accurately synchronized with the operation of the tact stick. In particular, similar to the mechanical metronome used in the past, a takt sound is generated when the tact stick reaches a predetermined position that is shifted left and right from the center of swing, so users who are used to the conventional mechanical metronome feel uncomfortable Never give.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of an electronic metronome according to an embodiment of the present invention.

FIG. 2 is a waveform chart for explaining the operation of FIG. 1;

FIG. 3 is an explanatory diagram showing a configuration of a conventional example.

[Explanation of symbols]

 Reference Signs List 1 tact stick 2 drive coil 3 search coil 4 comparison circuit 5 monostable multivibrator 6 sounding circuit 7 speaker

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-232254 (JP, A) JP-A-6-148355 (JP, A) JP-A-4-8997 (JP, U) 9895 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) G04F 5/02

Claims (1)

(57) [Claims] 1. A tact rod reciprocally swingable left and right, a drive coil for reciprocating the tact rod right and left, and / or
Or, in an electronic metronome having a search coil, a signal generating means for receiving an output of the driving coil and / or the search coil and generating a synchronized signal when the tact rod reaches the swing center; and receiving the signal, the tact rod reaches a predetermined position shifted to the left and right from the swing center and the
An electronic metronome provided with a sound generating means for generating a tact sound a predetermined time after the generation of the signal which can be regarded as a signal .