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JPS4835303

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DESCRIPTION JPS4835303
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing the principle of a stereo
reproduction apparatus for explaining the present invention, FIG. 2 is a system diagram of an
example of the stereo reproduction apparatus of the present invention, and FIG. 3 is a stereo
reproduction to which the present invention is applied. The device is a perspective view showing
the appearance of a radio cassette-like cassette recorder, FIG. 4 is a partial view thereof, FIG. 5 is
a perspective view showing its adapter, and FIG. FIG. 7 is a perspective view showing the external
appearance of another radio cassette tape recorder as a stereo reproduction apparatus to which
the present invention is applied, and FIG. 8 is its reproduction apparatus main body and an
adapter, and FIG. 9 is a perspective view showing the left and right adapter parts in a separated
state I, FIG. 10 is a perspective view showing the back of the left adapter part, and FIG. Shows
part of the housing of the right adapter part Perspective view, a perspective view illustrating
another use state of the radios cassette tape recorder of Fig. 12 (l hem. Reference numeral 1
denotes a reproducing apparatus main body, 2 an adapter, 5L and 5R a power amplifier, 7L and
7R left and right built-in speakers, and 8 a mixing circuit. Fig. 1 R9 General view 48 to 35 303
(4) Fig. 10 Fig. 11 Fig. 12 Fig. 12
DETAILED DESCRIPTION OF THE INVENTION The present invention provides an external
speaker which can obtain a stereo feeling like a dog with a small number of devices having an
inner-layer speaker with a relatively small distance between speakers, and can arbitrarily select
the distance between the speakers. Also, it is intended to obtain a stereo reproduction apparatus
that can also perform stereo reproduction (1). In the conventional stereo reproduction apparatus,
the left audio signal SL and the right audio signal SR of the stereo signal source are respectively
supplied to the left speaker system and the right speaker system, and the left audio signal and
the right audio system respectively It was usual to make it go off and let it go. In such a stereo
reproduction apparatus, if the distance between the left and right speaker systems is too narrow,
the stereo feeling will be small. Therefore, the left audio signal SL and the right audio signal SR
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from the stereo signal source are supplied to the mixing circuit, and the left channel audio signal
SI = SLm′′R (where m is the mixing ratio 0 <m <1) and the right channel audio Make a signal
S, = SR-ms L, and supply left and right channel audio signal S1% Sf to left and right speaker
system respectively to emit left channel audio and right channel audio respectively to perform
acoustic i trix There has been proposed a stereo playback apparatus jII which has a large stereo
feeling despite the relatively narrow spacing between the left and right speaker systems, for
example, 20 to 30 degrees. Next, such processing for each stereo reproduction bag will be
described with reference to FIG. SPL and SPR are disposed at intervals d, respectively, and t is a
left and right speaker, and P is a listening position of a listener, for example, on a vertical bisector
of a straight line connecting the left and right speakers SPL-SPR. The left channel audio signal SI
= SLmSR and the right channel audio signal S, SR-mSL are supplied to the left and right speakers
SPL and SPR, respectively, and the left and right speakers SPL% 8Pn and the left channel
respectively. Voice L-m'R1 Right channel voice R-m'L (where mo is a voice mixing ratio, and o <m
(1)) is emitted. Left and right speakers 8PI from the listening position P. Assuming that unit
vectors of SP8 direction (assuming each speaker as a point sound source) are respectively Ma
and Neck, the sound waves from the left and right speakers SPL and SPR! The sound pressure
vector at the number position P is as shown in the figure below: l4-m'Ra, Rh-m'Ll). Left voice
sound pressure solid. Toll La and -m'Lb are vector-added to obtain a left speech sound pressure
vector L (a-m'g), and right speech sound pressure vector Rb and -m'Ral are vector-added to a
right speech sound pressure vector R (1-m'r) is obtained.
That is, as is apparent from the drawing, the left voice and right voice R are heard as coming
from the left and right speakers SPb, SPR position and left and right spread directions. That is,
the sound of the left and right channel sound as described above-? The distance between the left
and right speakers is relatively reduced by selecting the value of the mixing ratio m appropriately
(close to 1) from the fact that the width of the stereo sound field has been expanded by the Tolix.
The principle of the figure holds for the difference in the sensing of the direction of the sound i,
i.e. for sounds with a frequency of 200 to 40 Q) 'Iz to 2 to 4 KHz, which is a large stereo sound.
The mixing ratios m and m 'can also have frequency characteristics, and are generally
represented as cans and fu. The present invention is intended to obtain a device which can be
used as a stereo reproduction device of 7tm or more as described above by further using an
external speaker in such a device. The invention will be described in greater detail in the
following with reference to the drawings. The present invention is applied to a wooden (4) Jf'l- +
1 [PInQ-nc cassette low-speed coater] with radio (AM-FM) and is a fC case. FIG. 2 is a system
diagram of a stereo reproduction apparatus according to the present invention. The stereo
reproduction device according to the invention consists of a reproduction device body (1) and an
adapter (2) which can be combined with the reproduction device body (1). The nine components
of the main central portion of the playback apparatus main body (1) are as follows. 'rL and TR
are left and right audio signal input terminals, respectively. Left and right audio signals SI and SR
of stereo signal sources such as FM stereo receiver, record player, magnetic recording /
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reproducing apparatus etc. It is designed to be supplied to TL and T □. (3J) and (: tR) are left and
right equalizing circuits, SWL and SW, respectively, are left and right changeover switches for
inserting and removing the mixing circuit described later, and (4L) and (4R) are respectively left
and The right sound quality warning circuit, (5L) and (5R) are left and right output amplification
circuits respectively. Thus, the left audio signal / input terminal- is left at the input end of the left
output amplification circuit (5L) through the left equalization circuit (3L) -left switching switch
8WL-left tone quality adjustment circuit (4L). Also, the right audio signal input terminal TR is
connected to the input side of the right output amplification circuit (5R) through the right
equalization circuit (3B) -right switching circuit (5) and the right sound quality adjustment circuit
quality adjustment circuit (4R) . The adapter (2) comprises left and right internal speakers (7L), ()
R) and a mixing circuit (8). The 2nd-class speakers () L) and () R correspond to the left and right
speakers SPL and SPR shown in ff11 in the above figure. In this example, they are one full-tone
speaker, but It may be a speaker system comprising a plurality of different speakers.
Further, the mixing circuit (8) is also described in the above-mentioned figure 1 and corresponds
to the next mixing circuit. This mixing circuit (8), for example, uses left and right amplification
transistors in a 22-collector-split type to produce left and right audio signals of opposite phase,
and so on. The mixing ratio may be varied with K or t so as to mix at (with or without frequency
characteristics). Also, when the playback apparatus body (1 + K adapter (2) is combined and
combined, the mixing circuit (8) is between the left and right equalization circuits (3L) and the
left and right tone control circuits (4L) and (4R). While being inserted, the left and right inner
speaker (7L) and () R) are respectively output to the left and right output amplifier circuits (5L)
and (5R) (6) all 3-353D needle 1 It is supposed to be □、ア、、、、(2]dE?!!!
t*amよ−よヶ、。 When it is 1, the left and right equalization circuits (3L) and (3R) are
connected to the left and right tone control circuits (4L) and (4R) respectively without passing
through the mixing circuit (8). There is. For this reason the left and right changeover switches
SWL mentioned above. Although SWR is provided, 2nd grade switch SWL. The SWR is
interlocked and has a movable contact a and a fixed contact b% C. Switch 8WL. The movable
contacts a of the SWR are connected to the input @ of the left and right tone control circuits (4L)
and (4R), respectively. The fixed contacts C of the two switch SWL and SWR are connected to the
input sides of the left and right passing circuits (3L) and (3R), respectively. The playback device
body (1) is provided with the connection terminals (10L), (IOR), (11L), (11R) for connecting the
mixing circuit (8) of the adapter (2). Adapter (2) K connection terminals (1 o L), (1 o R ') and (11
L') (II R ') are provided. In this case, in this case, the connection terminal (1 o L '), (IOR') and the
mixing circuit (slo input II ic W b are connected, and the connection terminals (u L ') and (II R are
output from the mixing circuit (8) (force 4R-15, 303 It is connected to the inside. The fixed
contacts of the friend and right changeover switches SWL and SWR are connected to the
connection terminals (IIL) and (IIR) of the reproducing apparatus main body (1), respectively. In
addition, in the playback apparatus body (1), connection terminals for connecting the output
sides of the left and right output amplifier circuits (5L) and (sR) to the left and right built-in
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speakers () L and (7R) ( 13L), (13R) are provided, and the adapter (2) is connected to the 2 尋
speaker connection terminals (13L), (13R)!
2, connection terminals (14L) and (14LL) from which built-in speakers (7L) and (7R) are
respectively provided are provided. In the playback apparatus body +11, the output sides of the
left and right output amplifier circuits (5L) and (5R) are respectively derived, and connection
terminals (16L) and (16R) connected to the left and right external speakers are provided. A (18L)
and (18R) are left and right external speakers, α9 is its connection cord, (2oL) and (2OR) are its
connection terminals. When the left and right changeover switch SWL% SWB makes the adapter
(2) the mvc combined combination 1-next of the reproducing apparatus main body, its movable
contact a contacts the fixed contact, and the adapter (2) becomes (811+,,, o3 −o'i When moving
away from the playback device body (1), the movable contact portion is in contact with the fixed
contact bK. The second switch SWL and SWR are, for example, connection terminals Cl0L of the
playback device body (1) ), (1 o R), (II L), and (II R) may use seven switches as a switch jack. The
adapter (1) is coupled to the playback apparatus body (2), and next, each movable contact a of
the changeover switch SWL% SWB is switched to a small fixed contact 1 from the left and right
audio signal input terminals TL and TR Left and right audio signal SL. SR is mixed in this mixing
circuit (8) to obtain left and right channel audio signals 5I = SL-can SR, s, = 3R-m8L, and after
amplification, etc. light left and right The sound is supplied to the inner speaker (7L) and (7R)
and voiced and sound matrix stereo reproduction is performed. When the adapter (2) is detached
from the reproducing apparatus body f1, the movable contacts a of the left and right changeover
switches SWL and SWR are switched to the fixed contacts C. In this case, the left and right audio
signal input terminals TL and TR and the left and right audio signals SI and SR are amplified, and
the connection (9) 3 to 3-10 terminals 16L) and (16R), so if left and right external speakers (18L)
and (1eR) are connected to the equivalent connection terminals (16L) and (16R), second-class
speakers (18L) and (18R) The left voice and the right voice R are respectively emitted from. FIG.
3 shows the appearance of an example of a cassette tape recorder with geo after applying the
present invention to FIG. It has a flat shape as a whole, and consists of a reproducing apparatus
main body (11 and an adapter (2) as described above, and each has a flat housing Q stage%
separately. On the front panel (2aa) of the housing 6 of the playback apparatus body (1), a
cassette insertion hole, @ is a cassette, ■ is an operation button, α is a dial of a radio receiver,
32 is a ladder .
The rice field is a handle and is attached to the end of the front panel (25a) @ of the side plates
25b, 25c of the frame (c). The following left and right inner layer speakers (7L) and (7R) are
attached to the inside of the top plate (26 &) of the housing (I) of the adapter (2), but (37L) ,
(3qR) are the sound emission holes respectively. Also, the mixing circuit (8) shown in FIG. 1 doo
g-noon 3 o 3-If the playback unit body (1) and the adapter (2) are combined using a plug and a
jack described later, the adapter (2) is used in this example. After electrically disconnecting from
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the playback apparatus body (1), the following means are provided as needed to maintain the
mechanical connection. That is, an arched rotary hinge is rotatably attached at one end to one of
the side plates 26b and 26C of the housing 5 of the adapter 2 (26C). A fastening screw tap is
attached to the other end of the rotating hinge (c), and a side plate (25c) K slide plate CI of a
housing @ of the reproducing apparatus body (1). Is mounted so that the attached nine ends of
the tightening screws IO of the rotary hinge (s) can slide along the slide plates (41) Ic. Next, with
reference to FIG. 4 and FIG. T-5, the electrical connection between the playback apparatus body
(+1) and the adapter (2) will be described. In Fig. 4, the adapter (2) is dismounted from the
regenerator main body (11) and placed on the upper surface (z5d) of the housing (i) of the
regenerator main body (1) in the case where An electrical connection is provided on the face
plate (25e). J, ~ J, shirts C1i'qs-3S3 '3712, of which J are power supply jacks. J! The JM is a
jack with a switch and the whole is explained in a diagram in the whole figure and the role of the
skin contact M terminal (LOL), (IOR): (uL), (IIR) and the left and right changeover switches SWL,
SWR It corresponds to the jack Js and the speaker connection terminals (13L) and (13R) shown
in FIG. As shown in FIG. 5, plugs P, .about.P1, P, .about.P, which are fitted with second-order jacks
J, .about.J,... J,. As shown in Fig. 2, the hole mixing circuit (8) is housed 1451C. At the time of
combining and combining the reproducing apparatus main body (1) and the adapter (2) as
shown in FIG. 3, the above-mentioned jacks J1 to J, J, to J and the plugs P to Ps.
P, .about.P are fitted, and the following electrical connection and mechanical connection are
made with reference to FIG. In addition to the jacks J and -J, the followings are provided on the
back plate (25e) of the casing (3) of the playback apparatus body (11). That is, (C) is a built-in
antenna, Lotus antenna terminal board, (C) is an end for recording player connection 4ρ-1 W
nQ-1q, ■ is a DIN connector, (B) is an external speaker connection board The jacks
corresponding to the connection terminals (16L) and (16R) K in FIG. 2 are provided. Also, (d) is
an AC power cord, and the figure is an AC power outlet. In Fig. 6, the above-mentioned two
figures are described, and an external speaker (speaker box) (18 L) at the hole. In the nine cases
where the (18R) is used, the adapter (2) is dismounted from the reproducing apparatus main
body (1), and the external speakers (18L), (1sR) (for example, with pin plugs) The connection
terminals (jacks) K of the terminal board Q) are connected, and the second external speaker (18L)
is disposed at a desired distance. The adapter (2) is provided with a connection cord (11 or a
cord introduction hole through which the AC power supply cord Q passes) of the external
speaker (18L)% (18R). Next, another example of the cassette tape recorder with the next radio
(AM-FM) to which the present invention is applied will be described with reference to the
drawings). In this example the adapter is configured in two parts with left and right inner
speakers respectively i-'J! ’+’In? In this case, a mixing circuit is included in any part or
part of the regenerator, and an adapter consisting of two parts such as two parts is combined so
as to overlap the reproduction apparatus main body. In the following description, parts
corresponding to those in FIG. 2 'to FIG. 6 will be assigned the same reference numerals as in FIG.
Fig. 17 shows the appearance of this cassette tape recorder with radio. The system comprises a
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playback apparatus body (1) and an adapter (2) consisting of left and right adapter parts (2L)
and (2R). The playback apparatus main body (1), left and right adapter parts (2L) and (21) are
respectively housings (C) and (26L). (26R) is included. The portion on the front panel (25 m) of
the reproducing apparatus main body (1) and the handle (d) are the same as the above-described
example. The left and right adapters (2L) and (2R) housings (26L) and (26R) are the same as the
speaker box, and the inside of the left and right built-in speakers ( 7L) and (7R) are
accommodated, and the mixing circuit (8) is accommodated in one of them, for example, in the
left adapter portion (2L).
4R-qR 07-1 et al. Left and right adapters (gL) and (2R) are coupled side by side on the upper
surface of the housing (3) O of the reproducing apparatus main body (1). Although this combined
assembly (electrical connection to #) is performed using a bladder and a jack as described later,
in order to ensure the mechanical connection, the following means are used as the regenerator
main body (1) and the left and left Right adapter parts (2L) and (2R) K are provided. That is, as
shown in FIG. 8 showing an off view and a state in which the left and right adapter parts (2L) and
(2R) are detached from the regenerator main body (1), the left and right adapt and trailing parts
(gL), A plurality of movable hooks CII are provided on each of the housings (2B) / (26L) and
(g6R), and a plurality of movable hooks CII are provided corresponding to the other side, etc. )
The hook receiver συ is provided at Ohm. The hook receiver συ is movable in a direction
perpendicular to the hook insertion direction, and movement of the hook receiver συ is
performed to hold and release the p hook (至) and the hook receiver συ. Note that (d) is a
moving plate for moving the hook (d). Next, electrical connection portions of the reproducing
apparatus main body (1) and the left and right adapter portions (21) and (2B) will be described
with reference to FIG. 9 years old left and right American 4R-? R’Jn? A drawing showing
the next state after separating the -1R pig part (2L) and (2R), a drawing 110 is a drawing
showing a state in which, for example, the back side of the left adapter part (2L) is inverted and
turned upside down. An electrical connection portion is provided on the top plate (2sd) of the
casing (3) of the playback apparatus body (1). J, L to J, l are jacks, of which J, l to J, l are power
supply jacks, the other is a switch jack, and the whole series of jacks with switches described in
Figure 2 and the next connection It plays the role of terminals (loL), Cl0R); (11L), (IIR) and the
left and right changeover switches SWI and% SWB. The jacks J, ", J, l correspond to the speaker
connecting terminals (13L), (13R) shown in FIG. As shown in FIG. 1o, the plug P, '% P,' which is
fitted with the jack J1 'to J, 1 out of 2nd order jack J, 1 to J, 1 as shown in FIG. It is provided on
the back plate of (261). Also Jack J? Plugs P, 1, P, and 'which mate with' SJ '' are provided on the
back plates of the housings (26L) and (26R) of the left and right adapter parts (2L) and (2R),
respectively. Px is a speaker auxiliary e-yack.
Also, between the left and right adapters III (2L), (2R) 48-S! In order to achieve lIqnt-17
pneumatic connection, spring plug pBy spring plug receiver JB (Fig. 11) is provided on the
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opposite side surfaces of the respective housings (26L, <261). When the playback apparatus
body (1) and the left and right adapter parts (2L) and (zR) are combined as shown in the off view,
the left and right adapter parts (2L) and (2R) have spring plugs PB and The left and right adapter
parts (with the jacks J, l, J, l and the plugs p, 1-P, 1 described above being electrically connected
to the spring plug receiver JB). Electrical coupling is performed between 2L), <2R) and the
playback apparatus body (1). In the case of the off view, the reproducing apparatus body fl) is
used in a visual manner, and the left and right adapter parts (2L) and (2B) are combined to
perform acoustic matrix reproduction. In Fig.12, the above-mentioned Fig.2 is explained and the
external speaker (18L) and (18R) for the next and 4th, the built-in speakers (7L) and () of the left
and right adapter parts (2L) and (2R) When R) is used, the left and right adapter parts □□ (2L)
and (2B) are removed from the regenerator main unit (1) and the left and right Addag /,% zL),
(2R) built-in speakers () L), (sL) as external speakers are connected to the playback device body
(1) with a connection cord 、, etc. (2L) and (2R) are disposed at desired intervals. In this case, as
shown in FIG. 12, the regenerator main body (1) can be used in a horizontal state. In this case,
regardless of the mixing circuit (8), left and right voice signals are welded to the left and right
built-in speakers () L) and () R) of the left and right adapters (2 L) and (2 R). 81. . 8B is to be
supplied. According to the present invention described above, even with a small device having a
built-in speaker in which the distance between the speakers is relatively short, a great stereo
feeling can be obtained, and an external speaker capable of arbitrarily selecting the distance
between the speakers can be obtained. ! Can also be used for stereo reproduction, and the
practical benefit is great. In the above, one invention is a cassette with a radio, f-fV ': 2-lK * FfJ ゝ
* t "-)" 14 "1 ゝ 111 之 1 之一 一般 的 テ ー プ ,、 Reproduction [apparatus, radio receiver,
record reproduction apparatus etc. 4B-3F1 ''! n "4-IQ stereo reproduction apparatus The present
invention can be applied.
Further, in addition to the above-described left and right built-in speakers (7L) and () R) K, a
center built-in speaker may be further provided, and a sum signal of left and right audio signals
may be supplied to this center built-in speaker.
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