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JPH04208800

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DESCRIPTION JPH04208800
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio reproduction apparatus suitably implemented in, for example, an audio apparatus referred
to as a system component. 2. Description of the Related Art In a sound reproducing apparatus
having a prior art independent bass amplifier, when the bass speaker box is separated from the
amplifier, only the audio signal output from the bass amplifier can be heard through the bass
speaker. Since the mid-high frequency is removed from the sound output from the deep bass
amplifier, listening to this sound alone causes the listener to feel uncomfortable or odd. For this
reason, the sound output from the deep bass speaker needs to be output together with the sound
output from the middle high band speaker connected to the middle high band amplifier. In order
to prevent sound from being output solely from the deep bass speaker, the deep bass speaker
and the mid-high range speaker are provided in the same speaker box, and the connectors of the
amplifier and the speaker box are the same. When the connector is connected, the deep bass
speaker and the mid-high range speaker are simultaneously connected, and sound output of only
the deep bass speaker is prevented. In the prior art, in order to connect the speaker box
integrated with the amplifier, a special connector and connecting wire are required, the
connector and connecting wire have no versatility, and the connecting wire material is also
limited. There is a problem of In addition, since the bass speaker and the mid-high range speaker
must be in the same speaker box, living in an integrated connector, it is difficult to separate and
create the mid-high range dedicated speaker box and the mid-high band dedicated speaker box.
There is also a problem that An object of the present invention is to provide an acoustic
reproduction device capable of solving the above-mentioned problems and preventing only a
relatively low frequency component of the acoustic signal from being reproduced. Means for
Solving the Problems The present invention provides a first amplifier to which an acoustic signal
to be reproduced is given, a first speaker connected to the first amplifier, and a predetermined
08-05-2019
1
frequency of a relatively low frequency of the acoustic signal. A second amplifier provided with a
band component, a second speaker connected to the second amplifier, and detection means for
detecting whether the acoustic signal is supplied to the first speaker, the detection means An
audio signal is provided to the second amplifier when an audio signal supplied to the first
speaker is detected. Operation According to the present invention, the first speaker is connected
to the first amplifier to which the acoustic signal to be reproduced is given, and a relatively low
frequency predetermined frequency band component of the acoustic signal is given. A second
speaker is connected to the second amplifier, and the detection means detects whether an
acoustic signal is supplied to the first speaker.
When it is detected by the detection means that the acoustic signal is supplied to the first
speaker, the acoustic signal is supplied to the second amplifier, and the second speaker alone is
prevented from generating sound. Embodiment 1 FIG. 1 is a circuit diagram showing an electrical
configuration of a sound reproducing apparatus 20 according to an embodiment of the present
invention. The main horium 2 connected to the acoustic signal source 1 realized as a cassette
tape recorder or compact disc (CD) player is connected to the mid-high band amplifier 5 via the
resistor 3a and the spare capacitor 4a, The mid-high band amplifier 5 is connected to one
terminal 6 a of the mid-high band speaker 6 via the capacitor 4 b and the terminal 5 a. The other
terminal 6b of the middle to high frequency speaker 6 is connected to the ground potential via
the terminal 5b and the resistor 3b. The mid-high range speaker 6 is detachable to the mid-high
range amplifier 5. The resistance value of the resistor 3 b is selected to be about 1710 of the
impedance of the middle high frequency speaker 6. For example, assuming that the speaker
impedance is 6Ω, it is selected to be about 05Ω to 0.6Ω. When the output of the middle to high
frequency amplifier 5 has a margin and the output can be down, it may be 115 to 1/10 of the
speaker impedance. An amplifier 7 is connected to a connection point 16 between the terminal 5
b and the resistor 3 b. The amplifier 7 is connected to the anode side of the rectifier diode 8. The
cathode side of the rectifier diode 8 is connected to the resistor of the resistor 3 (-through the
resistor of the NPN type l · transistor 9 and to the ground potential through the capacitor 4C) It is
connected. The source of the transistor 9 is connected to the ground potential. Furthermore, the
main horium 2 is connected to the heavy bass volume 10 via a resistor 3d, the heavy bass
volume 10 is connected to a resistor 3e via a low bass torque 11, and the resistor 3e is a heavy
bass amplifier 12 and an NPN Type collector 13 is connected to the collector. The emitter of the
transistor 13 is connected to the ground potential. The deep bass amplifier 12 is connected to
one terminal 14a of the deep bass speaker 14 via the terminal 12a, and the other terminal 14b of
the deep bass speaker 14 is connected to the ground potential via the terminal 12b. The bass
speaker 14 is attachable to and detachable from the bass amplifier 12. The power supply port 1
¥ 815 is connected to the ground potential via the capacitor 4 d, the collector of the transistor 9
via the resistor 3 f, and the ground potential and the base of the transistor 13 via the capacitor 4
e.
08-05-2019
2
Further, the power supply circuit 15 is connected to a ground potential, a middle high frequency
amplifier, a single deep bass amplifier 12 and a resistor 3g via a capacitor 4f. The resistor 3g is
connected to the ground potential and the amplifier 7 via a capacitor 4g. The middle high
frequency amplifier 5, the amplifier 7 and the bass amplifier 12 are each connected to the
ground potential. When the middle high band speaker 6 and the heavy bass speaker 14 are
connected together, the sound signal given from the sound signal source 1 is volume-adjusted by
the main volume 2, and then the middle high band amplifier through the resistor 3a and the
capacitor 4a. 5 and amplified in the middle high band amplifier 5, and then input to the middle
high band speaker 6 through the capacitor 4 b and made acoustic by the middle high band
speaker 6. When an acoustic signal is given to the mid-high range speaker 6, a current flows to
the resistor 3b, so a voltage is generated at both ends of the resistor 3b, and a current flows to
the j-7 amplifier 7. This current is amplified by the amplifier 7 and converted to a direct current
in the rectifying diode 8 to be supplied to the base of the transistor 90, and the transistor 9 is
turned on. Therefore, the base of the transistor 13 is connected to the ground potential through
the transistor 9, and the transistor 13 is turned off. The main volume 2 and volume controlled
sound signal is also volume controlled iij in the heavy bass volume IO. After that, the low-pass
filter 11 removes the mid-high frequency component and inputs it to the deep bass amplifier 12
through the resistor 3e. At this time, the output of the low pass filter 11 is not input to the
transistor 13 because the transistor 13 is in the off state at the above-mentioned time). The
acoustic signal input to the deep bass amplifier 12 is input to the deep bass speaker 14 and is
sounded by the deep bass speaker 14. When the middle to high frequency speaker 6 is not
connected, no current flows through the resistor 3b, and the base of the transistor 9 is at low
level. For this reason, the transponder 9 is turned off. Accordingly, the base of the transistor 13
becomes high and the transistor 13 is turned on, so that the acoustic signal whose volume is
adjusted by the single bass volume 10 is given to the transistor 13 through the low pass filter 11
and the resistor 3e. It is released to the ground potential via Therefore, it is possible to prevent
the generation of sound from the speaker 1.4 when the speaker 6 is not connected. FIG. 2 is a
time chart showing the operation of the sound reproducing apparatus 20. As shown in FIG.
As shown in FIG. 2 (1), a low level signal is input to the base of the transistor 9 through the
amplifier 7 and the rectifying diode 8 in the period T1 in which the acoustic signal is not input to
the middle to high frequency speaker 6. The transistor 9 is turned off (see FIG. 2 (2)), and a high
level signal is input from the power supply circuit 15 to the base of the transistor 13. Therefore,
the transistor 13 is turned on (see FIG. 2 (3)), and the acoustic signal having passed through the
low pass filter 11 is emitted to the ground potential through the resistor 3e and the transistor 13.
Is not input and no sound is generated from the deep bass speaker 14. In a period T2 in which an
acoustic signal is inputted to the middle high frequency speaker 6, a high level signal is inputted
to the base of the transistor 9 through the amplifier 7 and the rectifier diode 8 and so on, and the
transistor 9 is turned on. Since the base of 3 (a high level signal is not input from the t source
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3
circuit 15, the transistor 13 is turned off. For this reason, an acoustic signal having passed
through the low pass filter 11 is input to the heavy bass amplifier 12 through the resistor 3e,
amplified by the heavy bass amplifier 12, and then input to the heavy bass speaker 14 to
generate sound from the single bass speaker 14 Do. As described above, according to the present
embodiment, when an acoustic signal is input to the middle high frequency speaker 6, sound is
generated from the deep bass speaker 14, and only the relatively low frequency frequency of the
acoustic signal is acousticized. Can be prevented. Therefore, the deep bass speaker 14 and the
middle high frequency speaker 6 can be installed in separate speaker boxes. Therefore, since it is
not necessary to use special connection wires and connectors as used in the prior art, and
versatile connection wires and connectors can be used, manufacturing costs can be reduced. In
addition, an effect is also obtained that the noise generated when switching the function of the
audio equipment is not generated from the deep bass speaker 14. As described above, according
to the present invention, when the detection means detects that the acoustic signal is supplied to
the first speaker, a predetermined frequency band component of a relatively low range of the
acoustic signal is provided. An acoustic signal is provided to the second amplifier, and the second
speaker generates an acoustic signal. Therefore, it is possible to prevent only the relatively low
frequency component of the acoustic signal from being reproduced.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a diagram showing the electrical configuration of a sound reproducing apparatus 20
according to an embodiment of the present invention, and FIG. 2 is a time chart showing the
operation of the sound reproducing apparatus 20.
5 · middle high frequency amplifier, 6 middle high frequency speaker, 9 ° 13 · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · sound reproduction device agent patent attorney patent
attorney Saito
08-05-2019
4
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