JPS5277724

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DESCRIPTION JPS5277724
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a conventional
acoustic device, FIG. 2 is a block diagram showing an acoustic device using a hiss noise reduction
device according to an embodiment of the present invention, and FIG. It is operation ¦ movement
explanatory drawing of an example. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · selector switch ·
Volume, 6 · · · · · · 2nd amplifier (main up), 7 · · · · · · · · · · output terminal. Fig. 1-65 Fig. 2 (Fig. 2)
Fig. 3 (d) Main asia joint f 001 KIOK f DD f K f OK 1 1 1 1-1 1 indicates a 4 th. −66−
[Detailed description of the invention] The present invention effectively removes hiss o, s, which
is generated when reproducing the signal of the record blur with the tape recorder BK and
reproducing it with an air-introduction head. Hate noise; correct as it relates to a device to
eliminate hiss. ・ ・ ・ ・ ・ ・ ・ ・ 12 minutes in high band compared to low noodles in the
record! The music signal is bell-tone according to the time-series nature called IIIIL9, so-called
RIAAlI sex. After a while, the signal reproduced from the record ° is played on the magnetic tape
as it is, and when this signal is written with a head as it is, the case where it is produced nine, an
unnatural sound will be represented . For this reason, as shown in FIG. 1, the conventional
acoustic device (as shown in FIG. 1) corrects the RIAA characteristics. Figure 1A, 1 is Record
Luya, 2 is a preamplifier (hereinafter referred to as a preamp, 1.3 is a Chiale Coater, 4 is a
selector switch, 6 is a 1 j j j h f adjustment polymer, 6 is a power The output terminal 7, 1.7,
which is referred to as a main signal 7 or less, is an output terminal of the reproduction signal,
and the output 7 is connected to a slider (not shown) K. The 1-line amplifier 諺 kCfi main
amplifier 6 has resistors L + and l, and condenser tC +, respectively. The feedback path consisting
of C2 and the fILRM is softened, and the IA is also the playback output of the record player 1, b
is the Chiepre;-80 recording input brass, O is the playback output St of the t-precoater a I. In 鋤 3
allIF III 、, the lll sensitivity characteristics of the 999 signal reproduced by the record player 1
are as shown in Fig.- (the low region (compared to the high region is enhanced to become 9 RIAA
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41 characteristics). And 11 ANG 2 is the resistance Rz, Rz, Conden fC1, cz-and other feedback
circuit is added 9th, sono 1 1 1 l [The agility will fall 4 (the aJK shows a stone that will destroy
the area & Has become a characteristic. The output characteristics of this nineteenth, one ann 12
are shown in Fig. 1al, and the whole area KW is seven rat fk? A signal with a 14q □ 1 &
characteristic such as 1 and Jin is recorded by magnetic QK. そ−1! And a good signal is also
produced with a flat characteristic sound as shown in Fig. 5ikl (a), but this time it is due to the
magnetic field of the magnetic head and the aI of the magnetic head. The hiss noise as shown by
the broken line in FIG. Then, the reproduced good signal tohiss noise is supplied to the main reed
16 through the seleter switcher 4 and the polymer 6. The main ane 16 is rounded off with a flat l
lability as shown by aall 1 ml K, and it is regenerated from its power i 7 l l flat 1% seven-n-y, navy
sby turtle 4 power The combined scrap and drop number characteristic of the signal is also an
art turtle.
This nineteenth, the high-range emphasized nine unnatural feeling can be removed, and you can
work @ with a natural feeling. However, in this case, as it is apparent that the hiss is also
reproduced as it is, as it is apparent from the genius @ t @ l, there is an open-up when this hiss
noise becomes an offensive sound. Home 1! 1Fi is to provide a hiss field reduction device which
can easily determine such intermittent points ec *. Hereinafter, an embodiment of the present
invention will be described with reference to FIGS. In FIG. 2, the same parts as in FIG. 1 are
attached with the same reference numerals and the description thereof is omitted. The I I 7 y 72
is provided with a #I passage having a switch all 82 for connecting m 1 fl +, 112 ry f n t c +, C 2
C) to the concrete CI, C 2). There are nIllum roads with coyfytcs, Ca, x4y chiam, 8m. In the above
configuration, first, the case of performing RIAAll amount 6 will be described. このときはスイッ
チ81.8! Turn off the preamp and turn it around 20 rounds (3) (as shown, it will be hugely
flat over the whole area) As shown, the high range is emphasized and nine RIA inertias are to be
made, and such characteristics are bellowed to magnetic tape. Therefore, the magnetic head
(which is generated from the magnetic head 1 and the good signal also has the IIIAAIf property).
In addition to this, as in the conventional case, hiss noise as shown by [1] in FIG. 1 MK1 occurs,
and these false odds and hiss noise are supplied to the main amplifier 611C. Switcher 8 sumi
here. Turn on the 84th main m en to τ m 周! (1) to reduce the high frequency as shown in (1), it
becomes flat at the time of output, and as a result, it is reproduced from the speaker The sound
of the sound is also flat and unflat if it is unfit if it is unfriendly if Ifi and it is deprived of its
highs, moreover, it is attenuated in the highs I of hiss to III which corrects the goodness of the
phishian 16 ′ ′ e11 轟 ^ Hess noise can be removed to an effective 8mm6. Next, when the 1/2
RIAA II sound is to be performed, the switch 81 is turned on, the switch S2 is turned off, and as
shown at 31 m (@) K, only the low band is corrected by the preamplifier 2 and the switch 83 is
turned off, the switch 84 And the main amplifier 6 should correct the high frequency when
playing back the tape, and even in this way RIJLA-as in old times, to remove the unnaturalness of
the reproduction signal and reduce hiss noise it can.
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As described above, according to the present invention, it is possible to obtain the excellent effect
that the hiss noise generated during Qi 1 life can be removed extremely (and effectively
removed).
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