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JPS57176792

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DESCRIPTION JPS57176792
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an embodiment of the present
invention, wherein a is a general view, b is a top plan view, and C is a plan view. FIG. 2 is a
diagram showing a microphone arrangement in the present embodiment. FIG. 3 shows a
microphone input circuit in the present embodiment. FIG. 4 is a microphone directivity
characteristic diagram for showing the effect of the present invention. 1: Microphone 1.2:
Microphone 2.7: directional direction of microphone 1, 8: directional direction of microphone 2,
9, 10: amplifier, 11.12: FET, 13: terminal, 14: gain of amplifier 2 is 15 is a directivity
characteristic diagram when 0, 15: directivity characteristic diagram when the ratio of the gains
of the amplifier 1 and the amplifier 2 is 3 = 7.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an acoustic writer
which uses a directional microphone to perform recording. Heretofore, in the equipment of this
stock, there was an effect that #: t, only the target sound was recorded, and 1 the surrounding
noise was not recorded. Anti-thi, for example, Iji Fi which one many people make remarks-if you
are going to record that remark, ill, @ every time the disapproval k. You have to turn the
microphone in that direction, and it is a non-rich field b and k. 1-10 ′ ′, l) 1 ′ · 〆 灼 This
invention uses 12 directional microphones to eliminate the above-mentioned drawbacks, and
uses the two microphones' output method The purpose is to change the pointing direction of the
miter equivalently without changing the direction of the microphone. Next, an embodiment of the
present invention will be described with reference to the drawings. The first figure shows an
embodiment in which the present invention is used for a small-sized tape recorder, and is an
overall view of 141 strokes, 161 is a top plan view, +6) is a plane port. t *, Figure 2 It is an
underwater view of the arrangement of two microphones. In FIG. 2, 1 is a microphone 1.2 a
microphone 2. Also, 7.8 tlj, each island, Mike 1. It is a pointing direction of miter 2. そして、1イ
ク1. The microphone 2 is arranged so that its pointing direction changes at a busy angle. Here,
the output Vl of the microphone l and the output V of the microphone 2 when a plane wave is
03-05-2019
1
incident from one and the same that make all the corners of the microphone 10 from the
directivity direction. Vs = Vo (1 + co # a) -111vi = voll ÷ cosca bow))-1212-LO9 ('. となる。 In
Formula 111 and Formula C21, V @ # i, a distance between a sound source and a microphone
1I11. iF frequency, strength of the sound source. It is a constant dependent on the line between
the microphones. Next, FIG. 3 shows a brass sound lo circuit according to the present
embodiment, which is an amplification * connected to the 9ij microphone 1 and a toe
microphone 2 connected to the tob microphone 2. In addition, 11 and 12 each have an amplifier
9. 1 'lCT for changing the gain of the amplifier 10. Suppose that the gain of the amplifier 7 is 1
and the gain of the amplifier 8 is 3 in order to adjust the gate voltage of FICT. At this time, the
output V at the terminal 13 is V = lvl + m, V, -131. Substituting Ill, 121 into equation 131 It
becomes v-v, ((mum 8) + mt 6 aa # 4-A cot (# 10 F). Since aoa (# +-) xaf #, the above equation
becomes v = vo ((m + A)) + m16G + 11 + A1 * ia # 1- (4I).
また。 = 3-,, 109 ',',-'@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ Page 19
From equation (14), equation K151 can be substituted to obtain V = V @ 1 (AI + 11) + Jhl +
AIxcot (e + ψ))-171f. From the equation IT), it can be understood that the time when the signal
output becomes large is # + 91 = 0-181. If it is converted, it is equivalent to pointing a
universally homogeneous microphone of # =-ψ. Furthermore, since ic 161 y hf = tan "-", even if
the m spirit actually does not move the microphone, it is equivalent to 1 if it only changes the
ratio of the gain m and m 3 of the two amplifiers. The same effect as the great effect is produced
by rotating the mound # 'of the book's directional microphone. Therefore, the position of the tape
recorder can be changed without touching the tape recorder at all by processing the gate voltage
of the sheets 11 and 12 in FIG. You can turn the microphone's direction as you change it. 4-End
1098 As described above, according to the present invention, in order to change the pointing
direction of the IO and the microphone by changing the method of base of the outputs of the two
皐 -directional microphones, a unidirectional microphone is used. The effect of using it and a
colleague is obtained, and it is also effective in removing the annoyance of making a microphone
without moving it or removing touch noise when moving it.
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