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JPS55179488

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DESCRIPTION JPS55179488
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view for explaining the structure of a
guitar microphone, and FIGS. 2 and 3 are guitar microphones? FIG. 4 is a connection diagram
showing an embodiment of the present invention. 2 ...... machine - coil constituting a part of an
electrical conversion mechanism, 6 ...... electro - magnetic field converter, 7 ...... magnetically
sensitive element.
DETAILED DESCRIPTION OF THE INVENTION The present invention is a mechanical microphone
(41 m) such as a guitar microphone or other magnetic microphones and bitter ups, and it is
particularly effective to remove waveform distortion caused by the hysteresis characteristic of
the magnetic core. It is intended to provide a mechanical-electrical aS package that can obtain a
signal that is absent. iMike spirals are other magnetics and magnetics, and in the case of "", the
strings or diaphragms or movable pieces which are lying from the magnetic body are magnetic. It
is provided in contact with the core, these chords or diaphragms or movable pieces, etc. are
mechanically displaced, and the displacement changes the opposing gap with the magnetic core,
and the permanent magnet etc. provided in the magnetic flux communication of the magnetic
core The amount of magnetic flux emitted from the magnetizing member is changed, and the
change in magnetic flux is taken out as an electric signal by the pickup coil wound around the
magnetic core. The electrical signal output from such a mechanical-electrical conversion
mechanism is distorted due to the hysteresis characteristics of the magnetic core on which the
pickup coil is wound. For example, as shown in FIG. 1, a guitar microphone has a pickup coil 2
wound around a magnetic core 1 and a magnet 3 is magnetically coupled to one end of the
magnetic core 1 so that one end of the magnetic core 1 faces the pole face of the magnet 3 Thus,
a string 4 made of magnetic material is stretched. As the strings 4 are lifted, the amount of
magnetic flux passing through the magnetic core 1 changes, and the change in magnetic flux is
deposited from the big up coil 2. The magnetic core 1 has, for example, the hysteresis
characteristic as shown in FIG. 2 in addition. In FIG. 2, the vertical axis B (2) indicates the
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magnetic flux density and the horizontal axis V indicates the voltage of the electric signal
generated in the coil 2. Therefore, assuming that the chord 4 is taken in a sine wave as shown by
a person in FIG. 9-line, the change in the magnetic flux in the magnetic core 1 changes according
to the hysteresis loop, and the signal generated at the coil 2 is a curve in FIG. It becomes a
distorted wave as shown by C. That is, even if the string 4 vibrates in a sine wave as shown by a
dotted line in FIG. 3, a distorted wave as shown by a solid line in FIG. 3 can be obtained from the
pickup coil 2. Since the period T + of the first bovine cycle of this distorted wave passes through
the initial phase of the hysteresis loop and the period of the subsequent half cycle 'r1 ° Ts,
compared with T4, T + (Tt = Ts = Ti. In the case of an electric guitar, the first neck of the electric
guitar starts to vibrate, and the first neck has a drawback that it is felt as a stiff or squeaky brow.
The purpose of this option is to remove the distortion of the signal obtained from the pick-up coil
and to provide a mechanical-electrical conversion am of the kind that the half cycle of its head
does not overlap more than the other half cycle). is there.
This: 4 in the back 3) The output signal obtained from the machine-electric conversion tank
structure is supplied to the magnetic field conversion means, and the output aS is converted by
the magnetic field conversion means K [conversion of the magnetic field by the magnetic field
integration means] The magnetic sensitivity of the magnetic field of the conversion means is
supplied to a child, for example, a Hall element, which is less distorted than the magnetic sensor.
Further, it is configured to obtain a mechanical-electrical conversion device in which the period
of the half cycle of rise of It4 does not become short. One embodiment of this scheme will be
described in detail below with reference to the drawings. FIG. 4 shows an embodiment of the
present invention. In the figure, 2 is a magnetic coil lK wound big-up coil indicator, the signal
output from this pickup coil 2 is amplified by an amplifier 5, and the amplified output is supplied
to an electric-magnetic field f11 means 6. The electric and magnetic field f 櫓 means 6 can be
composed of a magnetic core 6m and coils 6b and K wound around the magnetic core 6aK. Here,
it is desirable that the hysteresis characteristics of the magnetic core 6a be different from the
hysteresis characteristics of the magnetic core 1 on which the pickup coil 2 is wound, such as a
Hall element if paired with the end face of the magnetic core 6m. (4) A magnetically sensitive
element 7 is provided, the output of this single gas sensitive element 7 is increased by
amplification @ 8, and a signal is obtained from the output terminal 9. Reference numeral 10
denotes a bias voltage source for the Hall element. Due to such constitution K, from the output
terminal 9, a signal having a waveform equal to the imaging waveform of the string 4 is obtained.
The seventh reason is that a distortion that is the reverse of the distortion generated in the
pickup coil 2 is generated between the electric-magnetic field f conversion stage 6 and the
magnetic sensitive element 7 and the distortion is canceled. That is, when performing the electromagnetic field conversion, the conversion from the curve C to the curve A in FIG. 2 is performed.
Therefore, even if the electric signal applied to the coil 6bK of the electric-magnetic field
transducer R6 has a distorted waveform as shown by the line in FIG. 3, the electric signal
obtained from the magnetic sensitive element 7 is a sine wave from which the distortion is
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removed Be Thus, according to the present invention, in the mechanical-electrical conversion
mechanism which converts mechanical displacement to magnetic flux change and generates an
electrical signal by the electrification of the magnetic flux, the electrical signal is converted by the
electrical-magnetic field f conversion means 6 ', 1. Convert to 7 and detect the change of the 7
magnetic fluxes by the magnetic wire (5) response element 7 and rewrite it again to the electric
signal. The distortion generated in the mechanical-electrical f1% mechanism from K is the
electric-magnetic field conversion means 6 and It can be canceled by means of an electromagnetic-field-electrical conversion means in combination with the magnetically sensitive
element 7. It is corrected that the distortion starts and the string 4 starts to vibrate in the first
half cycle period and the length of the iIO each half cycle each time it is corrected and the feeling
of the rising edge where the vibration of iM4 starts is felt hard Can be eliminated.
Although the case of the guitar microphone has been described in detail in the above, it can be
easily understood that the present invention can be applied to the case of a magnetic type
microphone, a magnetic type pickup or the like.
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