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JPS5140250

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DESCRIPTION JPS5140250
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a main part showing a
conventional audio equipment, and FIG. 2 is a frequency characteristic diagram when the circuit
of FIG. 1 is used. Curve Y shows the frequency characteristic of the earphone output when using
the earphone, and the curve 2 shows the frequency characteristic of the low frequency output
when the negative feedback is not applied. Fig. 3 is a circuit diagram of the main part of the
audio device according to the present invention, Fig. 4 is a frequency characteristic diagram
when the circuit of Fig. 3 is used, and curve X is the frequency characteristic of the speaker
output when the earphone is not used The earphone output 0 frequency characteristic when the
curve Y12 earphone is used, and the curve 2 shows the frequency characteristic of the low
frequency output when negative feedback is not performed. 1 ... earphone socket, 2 ... ground
terminal of the earphone socket, 3 ... low frequency amplification stage, 10.12 ... first and second
negative feedback circuit, E ... ground, R и и и и и Earphone destruction prevention resistance. Fig.
119-Actual open 5l-40250 (2) Fig. 2 / v 0 Hz / to / f ? at ? Fig. 3 Fig. 4 cause / KHIIJ liquid =
? 120-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to audio equipment
such as radio receivers and tape recorders. Recently, there have been a large number of highoutput audio devices (although they have been made, there is a risk that the earphones may be
destroyed when the earphones are attached to the earphone socket. In order to prevent such
destruction of the earphone, as shown in FIG. 2, it is known that a resistor M for preventing
breakage of the earphone is connected between the ground terminal (2) of the earphone socket
(1) and the ground. It is done. In FIG. 1, (3) is composed of the first and second low shoulder
wave preamplifying circuits (4 О 51 (bris driver circuit), driver circuit (6), and power amplifying
circuit f7) (71). Between the input and output of the low frequency amplification stage [between
the output terminal (9) of the power and p power amplification circuit (7) and the second low
frequency preamplification circuit (5)] A negative feedback circuit composed of a resistor and a
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capacitor (neither of which is shown) provided in the (sp) is a speaker. However, in the case of a
device in which a negative feedback circuit (8) is provided between the input and output of the
low frequency amplification stage (3) as shown in FIG. 1, when using an earphone [earphones
(not shown) Compared to when the speaker (8P) is loaded (when the earphones are not attached
to the earphone socket (1) lc), the load impedance becomes very high, and the negative II #
amount increases, and the negative R In the low band (less than several hundred H11 or less) or
high band (1QK11 m3 or more), the phase of the feedback signal is shifted and positive feedback
occurs to cause oscillation in the low band (less than several hundred H11 or less) There was a
concern. For example, when the negative feedback circuit (8) is provided in the low frequency
amplification stage (3) and 150 ? is used as the earphone breakage prevention resistor), the
frequency characteristic of the speaker output is shown in FIG. It looks like the curve (4), but
when using the earphone the frequency is IKHI! ,-\, It takes 2 to 3 times the evening negative * t
when not using earphones in the vicinity, and conversely 6 dB at around 100 Hjl! Positive
feedback is applied at i degrees, and the frequency characteristic of the earphone output is as
shown in FIG. [Curve body in FIG. 2] shows the frequency characteristic curve of the low
frequency output when negative feedback is not applied (when the negative feedback circuit (8)
is not provided). In view of the foregoing, the present invention provides an audio apparatus in
which a negative feedback circuit is provided between the input and output of the low frequency
amplification stage, and a resistance for preventing breakage of the earphone is connected
between the ground terminal of the earphone socket and the ground. By making the amount of
negative feedback at the time of use of the earphone approximately the same as the negative
feedback 1 at the time of non-use of the earphone, the above-mentioned drawbacks can be
solved by four methods. As shown in FIG. And a second negative feedback circuit (2) at the fixed
end 4 throat of the second low frequency preamplification circuit jig (6) and the earphone socket
(1). ) Are connected.
(In FIG. 3, the same books as in FIG. 1 were used for the same parts as in FIG. 1). Since the
present invention is configured as described above, when the earphone is not used (when the
earphone is not attached to the earphone socket (1)), the low frequency output signal (output
end 4 of power amplification rating (7)) is used. A part of the appearing signal is applied to the
input side of the low frequency amplification stage (3) (the second low frequency
preamplification circuit + 5) J-1 negative feedback via the first negative feedback circuit ?O and
the second The negative feedback circuit (2) is also connected to the input side of the low
frequency amplification stage (3). That is, the negative #I feedback amount is determined by the
cascaded circuit of the negative feedback circuit (1) (2) of the 1112th. When using some
earphones (when the earphones are attached to the earphones Ml), the second negative feedback
circuit (d) is opened, so the negative Il # amount is the first negative feedback loop 5 (I
Determined only by At this time, the low pigeon wave defect is transmitted to the speaker (8P)
through the negative feedback circuit (support) of the first negative feedback circuit QQ-4112 or
compared with the innobi-dance (for example, 8?) of the speaker First and second feedback
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circuits] Since the impedance of O is sufficiently large, no sound is emitted from the speaker (SP).
Therefore, when the earphone is used, a resistor, (R) is provided to increase the amount of
negative feedback by -C1, and conversely, the second negative feedback circuit 0 is opened. Since
it decreases, if the circuit constants of the first and second negative feedback 1ol paths uO0 are
appropriately determined, the negative peak return when using the earphone is made to
substantially match the negative return when the earphone is not used. The frequency
characteristic [Fig. 4 curve (Y)] is the frequency characteristic of the speaker output when the
earphone is not used !! [Fig. 4 curve (4)] can be approximately rounded. [It is to be noted that
FIG. 4 shows a frequency characteristic curve of the four-wave output in the case of the curve
Jll1 (when no negative feedback is applied (when the negative feedback circuit 00Q2 is not
provided together). 6 Negative when using C earphones! It is possible to prevent lR from being
excessively applied and causing oscillation in the low band or high band. As described above,
according to the present invention, in an acoustic device in which a resistance for preventing
breakage of the earphone is provided between the ground terminal of the earphone / 'socket and
the ground, the negative feedback caused by S corrosion when using the earphone is excessive. It
is possible to prevent the occurrence of sudden occurrence with a simple open circuit
configuration (it is practical. 4, simple convergence of closed surface 1 Figure 1 shows the main
part 1 of the main path 1 which carries out the conventional Chang-Huan 8a notation, Figure 2
shows the frequency characteristic diagram when the circuit of Figure 1 is used (, Curve c) shows
the frequency characteristics of the speaker output when the earphone is not used, curve (7)
shows the frequency characteristics of the earphone output when the earphone is used, and the
curve (the slope shows the frequency characteristics of the low frequency output when no
negative feedback is applied) .
Fig. 3 is a circuit diagram of the main part of the audio apparatus according to the present
invention, and Fig. 4 is a frequency characteristic diagram when the circuit of Fig. 3 is used. The
frequency time curve curve (7) shows the frequency characteristic of the earphone output when
the earphone is used, and the curve (Z) shows the frequency characteristic of the low frequency
output without negative feedback. (1) иии Earphone socket, 2 o и и и Earth kimono of the earphone
socket, (3) 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 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 $ Ts2
feedback circuit, working Earth и и и и и и и и и и и / anti-destruction mortgage registration utility
applicant applicant Sanyo Electric Co., Ltd. in charge of the first generation of the first WJ 717? 3
3?P-() R7 Fig. 2 Fig. 4a EI ? hh ? ?! Tsuchida b, bleHz 1 KN 1 1 1 1 L-, 1 ast 1 NH. Third rIA
76 wholesale 4 Ptz 402 501, 8 #, C
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