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JPS5381018

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DESCRIPTION JPS5381018
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external perspective view of a conventional
cassette tape recorder, FIG. 2 is an actual measurement value of diffraction in a conventional
device, and FIG. 3 is an explanatory diagram of recording and reproduction by the conventional
device. 4 is a perspective view of an embodiment of the tape recorder according to the present
invention, FIG. 5 is a side sectional view of the main part of the tape recorder according to the
present invention, and FIG. FIG. 7 is an explanatory view of a diffraction effect in the device of
the present invention, and FIG. 8 is an operation explanatory view of recording and reproduction
by the device of the present invention. 1・・・・・・キャビネット、2・・・・・・カセットテ
ープ、3・・・・・・スピーカ、6・・・・・−マイクロホン。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the installation II l
of the built-in microphone in a tape recorder, and one purpose thereof is to eliminate the
diffraction effect of the sound wave by the cabinet and to obtain a sound collection characteristic
having the same wave number characteristic. The second object is to defeat the recording /
reproducing system 34 including the built-in microphone of the tape recorder, and the second
object is to make the left and right of the conventional stereo tape recorder reverse in the prior
art. Depending on the way of recording, the number of recordings and reproductions has been
increased by providing a microphone mounting structure that allows recording and reproduction
without being reversed. (1)e;3−11o/? An external view of a conventional radioportable cassette cassette with radio is shown in FIG. In the figure, [11 is a cabinet, (21 is a
cassette tape, (3) is a speaker, C111 is a radio tuning dial, (5) is various volume knobs such as
volume funnel and tone control, and (6) is It is a built-in microphone. As shown, the built-in
microphone (6) is attached to the front panel of the cabinet (1). The sound collection
characteristics of the microphones attached to the front panel in this way are as follows: As
shown in FIG. 2, the sound receiving sound pressure rises above the mid-range and especially
above 2000 H due to the diffraction effect of the cabinet. The sound pressure around the high
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sensitive II ooo 上 が る is raised, so I can not make a faithful recording to the sound that is
kinkin. FIG. 2 shows measured values when the microphone is attached to the cabinet as shown
in FIG. 1,... Are the characteristics of the microphone alone, and b is the characteristics when the
microphone is mounted on the cabinet. As can be seen in this figure, the HOG of 11 g or more is
6 d] 1 high-sound pressure as compared to the sound pressure of a single microphone. Next, the
drawback of the prior art is the increase in noise due to (2) the speaker on the front of the
cabinet and the microphone near the kernel. Generally, the sound pressure of noise inside the
cabinet is 200 or more higher than the external sound pressure because the cabinet is sealed. On
the other hand, when the transmission loss of sound is measured, the transmission loss of cone
paper of the speaker is about 2 to 30 dark, and most of the internal sound pressure passes
through and leaks out. In order to confirm it further, the noise level of the cabinet @ surface is
measured, and the front of the speaker and the speaker show high noise / bringing. Therefore,
when the position of the speaker and the position of the microphone are close, the microphone
receives the noise and 2 becomes worse. Furthermore, since it is easy to receive microphone
vibration noise, it is necessary to attach a microphone to the lower part of the cabinet vibration.
Since the front panel has a large area, it vibrates and resonance occurs at a low frequency, and at
a low frequency, mechanical resistance of the cabinet is low and a sharp resonance "T" occurs to
increase the vibration. Furthermore, the conventional installation illustrates the disadvantages of
stereo tape recorders in construction with reference to FIG. (3) The same figure (al shows the
state at the time of recording, ((9) at the time of reproduction | regeneration). In these figures, O)
are left and right speakers, and (6) are left and right microphones. In the conventional
configuration, the sound recorded by the left microphone comes out from the left speaker. If it is
assumed that the orchestra is recorded with this apparatus and A is the first violin and 1 is the
second violin, then A is large for the right microphone and small for the left microphone (B is the
reverse). When this is to be reproduced, the sound of A from the right speaker, that is, the first
violin, and the sound of tJ: E, that is, the second <Iolin, are heard from the left speaker at point y.
This means that the position of the first violin and the position of the second violin on the stage
can be heard in the opposite direction. Next, the structure of the present invention and its effects
will be described. FIG. 4 shows the construction of an embodiment of the present invention. In
the figure, fil is a cabinet, (2) is a cassette tape, (3+ is a 'speaker,' is a radio tuning dial, (51 is a
volume, (61 is a left and right microphone). In the wood design, the microphone (6) is mounted
on the side surface (la) or the top surface (lb) of the cabinet without being attached to the #
surface of the cabinet. The actual installation is shown in FIG. In the figure, (7) is a sound
conducting hole, (a) is a microphone supporting rubber, and (9) is a lead wire for taking out the
microphone output. The same figure (Aal guide hole (7) may be provided on the side surface (la
of the cabinet as in al) and the microphone (6) may be attached, or the same figure (a
microphone may be attached to the outside of the cabinet as' bl May be FIG. 6 is a figure for
demonstrating the effect of this invention. In the conventional mounting, in the structure, a
microphone (6) is mounted on the front surface of the cabinet (11), so that sound is incident
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from the direction of P □ in FIG. Therefore, as described above, the sound of 2000 H, or more is
increased due to the diffraction effect of the cabinet. In the present invention, since the
microphones are attached to the side or top of the cabinet, sound is incident from the P2
direction in FIG. The diffraction phenomenon of the cabinet at this incidence is shown in FIG.
In the figure, the output sound pressure of the alj microphone alone, the output sound pressure
when it is incident from the bFip11 direction with this as OdB (reference), (2) about 2 to 3 dB of
difference ore due to the diffraction effect compared to the microphone alone. It becomes a
value. As described above, according to the present invention, it is possible to largely remove the
influence of the diffraction effect which has been adversely affected by the fact that the
frequency characteristic of the conventional example rapidly increases by about 6 dB at 3000 to
8000. Next, by installing a microphone on the side of the cabinet, the distance from the speaker
surface can be increased by using a microphone. Since the microphone picks up the mechanical
vibration noise of the tape reflector and improves the recording and reproducing system Q%
greatly. be able to. For example, it is possible to eliminate the phenomenon in which the left and
right are reversed in stereo recording and reproduction performed by customs in the
conventional example. That is, in the conventional example, since the microphone is attached to
the front of the cabinet, at the time of recording, it is necessary to face the front of the cabinet in
the direction of the target sound to be recorded. This is because, in the conventional structure,
when recording in the direction opposite to the target sound, the diffraction becomes large and
valleys and peaks are generated in the frequency characteristic in the midrange. However, since
the microphone is attached to the side or the top of the cabinet in the wooden device, even when
recording in the reverse direction during recording, that is, when the recording front is directed
to one's own direction, as shown in FIG. Most of the effects (can be recorded. Therefore, it is
possible to record sound A (the first violin) on the left side and sound B (the second violin) on the
right side at the time of recording Kti as in the figure (at the normal position as in season). It can
be played back. In addition, there is an advantage that it is easy to adopt because it is sufficient
to always record the recording surface in the direction of the creator. Fig. 1 is a perspective view
of the conventional cassette tape recorder, Fig. 2 is an actual measurement value of the
diffraction phenomenon in the conventional device, and Fig. 5 is an explanatory view of
recording and reproduction by the conventional device. (Al is at the time of recording, (bl is at
the time of reproduction, FIG. 4 is a perspective view of one embodiment of the tape recorder
according to the present invention, FIG. 5 is a side sectional view of the main part thereof, and
FIG. Fig. 7 is a schematic diagram for explaining the operation of the device, Fig. 7 is a diffraction
effect 0 explanatory diagram for the present tV device, and Fig. 8 'is an operation film of
recording and reproduction by \ eW of the present invention. ! -There is a track record. 11L・
・キャビネット、(2)・・・カセットテープ。 (1)(3)=・スピーカ、f61・・・マイ
クロホン。 Name of Agent Attorney Attorneys Yoshizaki Yuji (-) 1111 Figure 7 Figure # 12, b-, '', '-'-''!
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Mi, fi rozo q prisoner ")! 167#Ja。、。 1aaatauao aopazaxaaaa Tuomoyu [ru] 183M (C1)
(b) S 訃 10 M1018A third generation of people-": # I 4 w □. Q3 5111 (1) (1) □ 6 □ Q Fig. 6 · 81
°: 81018 · 0, □. −:m−m−1,1。 s7 Fig. "-Two o o cliff 70so7ao no trogaa laao a JJ II
(lsow1 maa: tm). @ 1 叡 (Hz) 1811 tcotb): i good □. 31 (・ ・ 4 〆 1 、 ・ − ■ − ^ の の の 4−
4− 4− 轟 轟 考 案 考 案 考 案 考 案 1006 1006 1006 門 門 門 門 門 番地 番地 番地 Matsushita
Electric Industrial Co., Ltd. 50-2 Matsuki Michio address same Ibaraki Sadaru name Satoshi
Satsuki address same as the above 7 Toginobhisa name trace Junshinhisa Yu? −1−101’?
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