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DESCRIPTION JPS59112798

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DESCRIPTION JPS59112798
[0001]
FIELD OF THE INVENTION The present invention relates to a speaker for audio equipment.
(Conventional structure and its problems) Conventionally, the amplitude, velocity, acceleration,
etc. of the vibration system are detected to control the speaker, but in the present invention, the
sound pressure generated from the vibration system using a microphone is used. To detect The
conventional detection system using a micropong has the advantage of being able to detect the
vibration without contacting the vibration system, but it should not be in contact with the
microphone even if the diaphragm vibrates largely, as shown in FIG. It is necessary to provide a
microphone 2 at the center of the angle 1 and to set a fixed distance from the diaphragm 3.
Therefore, the output signal of the micro bon 2 is delayed in phase by the distance from the
reproduction sound pressure of the diaphragm 3 of the speaker, and there is a time delay until
sound is generated from the diaphragm and the sound wave surface reaches the microphone. It
was very difficult to control the speaker freely with a simple configuration as shown in FIG. In
particular, at high frequencies where the distance between the diaphragm and the microphone is
more than one wavelength, the phase is delayed by 180 ░ or more, and it is impossible to
compensate for the time delay at higher frequencies. In FIG. 1, 4 is a yoke, 5 is a magnet, 6 is a
plate, 7 is a frame, 8 is a voice coil, 9 is a dust bar 10 is a dry cone, and 11 is an edge. SUMMARY
OF THE INVENTION It is an object of the present invention to detect a signal which is exactly
proportional to the reproduction sound pressure of the speaker and to control the reproduction
sound of the speaker easily and accurately. According to the present invention, in the flat
diaphragm speaker, the fixing device of the microphone is attached to the drive unit, the fixing
device is extended in the main radiation direction of sound, and the microphone is attached to its
tip. Is fixed near the center of the diaphragm. Embodiments of the present invention will be
described with reference to the drawings. In FIG. 2, 3 is a diaphragm of the speaker, and a hole is
provided in the center of the hole, and the holding base of the microphone 15 is provided so that
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the diaphragm of the microphone 15 comes to the same plane position as the diaphragm in the
hole. It is fixed to the top of the center pole 17. The sub-edge 16 is a low-frequency one so as to
prevent the sound pressure of the speaker from coming around the back side of the diaphragm 3
of the microphone 15. With this configuration, the diaphragm of the microphone 15 is not
located near the acoustic center of the reproduction sound pressure of the speaker, and there is
no time difference between the reproduction sound pressure of the speaker and the detection
sound pressure of the microphone 15. Further, since the wavelength is long at low frequencies,
the vibration of the speaker and the sound pressure in the vicinity of the plate 3 become uniform,
and the speaker diaphragm 3 and the microphone 15 stationary plate can be made to have
almost the same phase. In this case, phase compensation can also be realized with a simple
configuration that is the minimum necessary, and a theoretically-predicted system of calculations
can be easily realized without the need for theoretically complicated simulation calculations.
Although the directivity of the microphone 15 depends on the frequency to be controlled, it may
be directional if limited to low frequencies, but non-directivity is desirable if high frequencies are
included. FIG. 3 shows an embodiment in which the detection signal of the microphone according
to the present invention is fed back to the input side. Assuming that the gains of the power
amplifier 12 and the feedback amplifier 14 are A and B, respectively, It is well known that Nairite
4 will be improved. Further, in FIG. 3, there is no need for a correction circuit for correcting the
time difference between the microphone and the speaker as in the prior art, except that
frequency characteristics for obtaining the designed feedback amount are provided in A or B.
Further, according to the present invention, sound waves are not reflected and diffracted to
disturb the sound field at the emitting surface of the sound of the speaker such as the angle 1 in
FIG. It can be clean and good in appearance. In the above embodiment, although the diaphragm 3
of the speaker has been described as a flat diaphragm, in the case of a cone-shaped diaphragm as
well, a microphone is attached on the extension of the center pole 17 and a hole is formed in the
dust cap or in the dust cap. The same effect can be obtained by placing the microphone outside
the dust cap and fixing the microphone to the acoustic center of the reproduced sound of the
speaker in any case. Also, it is desirable that the mounting direction of the microphones be
oriented in the sound radiation direction in consideration of the phase at a high frequency.
(Effects of the Invention) According to the present invention, since the phases of the sound
pressure of the diaphragm of the speaker and the diaphragm of the microphone can be made
identical, it is possible to detect a signal accurately proportional to the reproduction sound
pressure of the speaker. There is an effect that the control of the reproduction sound of is
extremely easy to do.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is a sectional view of a conventional loudspeaker, FIG. 2 is a sectional view of a
loudspeaker according to the present invention, and FIG. 3 is a hoodback block diagram.
иии Angle и 2 и и и Microphone и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и plate и 7 и и и frame и 8 и
voice coil 9 и и и Damper, 10: drive cone, 11: end, 12: power amplifier, 13: speaker, 14: feedback
amplifier, 15: microphone, 16: sub-edge, 17. -Center pole. Figure 1 Figure 2
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