JPS5080402

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DESCRIPTION JPS5080402
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing a phase shifter
which is a basic form of a multistage phase shifter used in the device of the present invention,
and FIG. 2 is a characteristic curve diagram showing phase characteristics of the phase shifter of
FIG. Fig. 3 is a circuit diagram showing a multistage phase shifter used in the device of this
invention, Fig. 4 is a characteristic curve diagram showing the phase characteristics of the
multistage phase shifter of Fig. 3, and Fig. 5 is a pseudo stereo device according to this invention.
6 is an explanatory view showing the positional relationship between a listener and two speakers,
and FIG. 7 is a characteristic curve showing the frequency response at the position of the listener
in FIG. FIG. 6 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 2
second speaker. / I-/ 4 J 2 47 47 JR -3- I 50-402 0 2 (2)-A = 1 + j J, j side J ζ d 0 crime, \ l \ / \ l
\ l \ / \ 9 / / / f 7-4-/-4
[Detailed description of the invention] This invention is a television receiver (for example, a
pseudo stereo device suitable for use fall! する。 As is well known, in FM broadcasting, stereo
broadcasting is carried out, but in this case, it is necessary to emit a stereo signal from the
broadcast side and receive it-a stereo ring can be prepared to receive even stereo signals. By the
way, since stereo broadcasts are not performed in television broadcasts or radio broadcasts of
medium waves, television broadcasters can not east broadcast stereo broadcasts. Therefore, even
when receiving a television broadcast with a monaural signal at present--2-J, the stereo feeling
(realism) is incredible Q, the audience can enjoy the broadcast now, and it seems comfortable .
The present invention has been made in view of the above circumstances, and an object of the
invention is to provide a simple one-track pseudo stereo device which can receive a monaural
signal to obtain a stereo feeling and can be simplified in construction. An embodiment of the
present invention will be described nal K with reference to the following one drawing. This
consideration is that when the same signal from two speakers is in phase, the sound image is
localized at the center of the two speakers, and when reproduced in antiphase, the sound image
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is not localized at the center but has a wide band. In this case, the relationship t (2) of the phase
(in-phase, anti-phase) relationship is used to obtain the sound spreading effect and to eliminate
the anti-phase feeling which is unpleasant for one sense. In the device of the present invention,
the apparatus of the present invention uses the phase sea- '; ytm-, but firstly, if it is rare to
explain t, the phase phaser is constructed as shown in FIG. . In other words, the input terminal 1
is connected to the base of the transistor Q, and this transistor Q is connected to the + Voo power
supply via the resistor R-M and the capacitor 0 Are connected to the output terminal 2. Also, the
emitter of transistor 4Q is grounded via resistor RB and is connected to the front de-output
insulator 2 via resistor Rf. Such a phase shifter is (the phase changes so that it is the 21st / Vc
water centering on a frequency fc determined by the following equation with s9 in the all-90 °
phase shifter). 1fo1lrOR ··· - ·········· tlJ and the phase shift (- If the by multistage connection as
shown in FIG. 8 with the following condition constituting the multi-stage phase shifter, "-" = --'- <
"2rOnRn · listening · (2) 2tOn + Rn- + the phase award of # 'i Figure 4 VC shown as 1 doing
rotates relative change in frequency. In the multistage phase shifter shown in FIG. 48, suffixes
are attached to the circuit components of the phase shifter shown in FIG. 1), (8) is an input
terminal, and I4) is an output ladder.
By the way, this note 1 uses the phase characteristics as described above 1-1; 1-2 to provide
reproduced sound with a spreading effect (three-dimensional effect). As shown in. That is, the
input terminal 5 is connected to the first speaker 8 via the multistage phase shift 4-6 and the
amplifier 7 in series, and is connected to the second speaker 0 via the amplifier 9 t-. In this case,
the multistage phase shifter 6 is of course described above. It has the circuit configuration of FIG.
8 described above. In operation, a monaural signal to be input is supplied to the input terminal 5,
and this monaural signal is added to the multistage phase shift 4i-6 and to the amplifier 9. The
monaural signal having entered the multistage phase 7 footer 6 is applied to the amplifier 7 after
undergoing a phase change as shown in FIG. And each signal amplified by each amplifier 7 ° 9
is the speaker of @l and 42 8. Reproduced by lO. The device of this invention writes an original
signal from one of the 2illl speakers 8 and 10, and writes a signal that receives a phase change
from another force. FIG. 6 shows the listener 11 and the first and second speakers S. Fig. 7 shows
the frequency response at the position of the listener 11 in the case of Fig. L @ 6, and this comb
shape is narrow. The sense of sterility decreases if θ). The stereo image of this invention is
constructed according to the above explanation and illustration, so a stereo feeling can be
obtained while it is a monaural signal, and a viewer if it is used for a television receiver. You can
enjoy the powerful sj 儂 and the sound. Father, there is nothing wrong with making things simple
and cheap. The device of the present invention can be applied not only to television receivers but
also to radio receivers for monaural broadcasts and to reproduce monaural records. As described
above, according to the present invention, it is possible to provide a pseudo-stereo with great
practical value.
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