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DESCRIPTION JP2002281586

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DESCRIPTION JP2002281586
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio reproduction apparatus, and in particular, in an audio reproduction apparatus in which a
speaker terminal provided on an audio reproduction apparatus main body and a speaker are
connected by a cord, it is not necessary to care The present invention relates to a sound
reproduction device.
[0002]
2. Description of the Related Art Conventionally, when an amplifier and a speaker are connected
through a speaker terminal and a cord in an audio reproduction apparatus, the polarity of the
speaker terminal and the polarity of the cord connected to the speaker are confirmed and
connected.
[0003]
In the above-described conventional sound reproducing apparatus, when connecting an amplifier
and a speaker, or when replacing a speaker or a cord, it is necessary to confirm the polarity of
the speaker terminal and the polarity of the cord connected to the speaker. As it was not,
connection work and change work were troublesome.
[0004]
This invention was made in view of the above-mentioned point, and the place made into the
purpose provides the sound reproduction device which can connect a speaker, without
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confirming the polarity of the speaker terminal, and the polarity of the cord connected to the
speaker. It is to do.
[0005]
A sound reproducing apparatus according to the present invention is an audio reproducing
apparatus in which a speaker terminal provided in a sound reproducing apparatus main body
and a speaker are connected by a cord, and the sound radiated from the speaker is converted
into an electric signal. A microphone for converting, a phase detection circuit for detecting a
phase of an output signal of the microphone, and a control unit for receiving a signal from the
phase detection circuit and outputting a display signal to a display unit The display unit is
configured to display that the speakers are connected in reverse polarity when the display unit is
turned on.
[0006]
Further, according to the sound reproduction device of the present invention, in the sound
reproduction device in which a speaker terminal provided in the sound reproduction device main
body and the speaker are connected by a cord, the microphone for converting the sound radiated
from the speaker into an electric signal; A phase detection circuit for detecting the phase of the
output signal of the phase changer, a phase switching circuit for switching the phase of the signal
output to the speaker terminal, and a control unit for controlling the phase switching circuit with
the signal from the phase detection circuit being input. The phase switching circuit is configured
to switch the phase of the signal output to the speaker terminal when the speaker is connected to
the reverse polarity.
[0007]
Further, in the sound reproducing apparatus, the plurality of speaker terminals and the speakers
connected to the respective terminals are provided, and phase switching of the respective
speakers is sequentially performed.
[0008]
Further, in each of the sound reproduction devices, the phase detection circuit is provided in a
remote controller that controls the sound reproduction device main body.
[0009]
Further, in the sound reproducing apparatus, it is configured to display on the display unit
provided in the remote controller whether the phase of the radiation sound of the currently
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detected speaker is positive or negative.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sound reproducing apparatus
according to an embodiment of the present invention will be described based on the drawings.
FIG. 1 is a front view showing a remote controller of a sound reproduction apparatus according
to an embodiment of the present invention, and FIG. 2 is a block diagram showing the main part
of the sound reproduction apparatus.
[0011]
The remote controller 1 shown in FIG. 1 includes a key 2 and a display unit 3, to which a
microphone 4 is connected.
The remote controller 1 receives signals from an infrared light emitting unit (not shown), a phase
detection circuit of signals from the microphone 4, the key 2, and an infrared light receiving unit,
and sends control signals to the infrared light emitting unit and the display unit 3. It has a
control circuit.
[0012]
An infrared signal transmitted from the remote controller 1 is received by the light receiving unit
5 in the control unit 6 on the main body side shown in FIG. 2 and a control operation is
performed according to a command obtained by decoding the signal.
That is, the control unit 6 outputs a control signal to the DSP 7 and the phase switching circuit 8
to control the volume, polarity and the like of the speaker connected to the speaker terminal 9.
[0013]
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Although one DSP 7, one phase switching circuit 8 and one speaker terminal 9 are shown, in
actuality, only the number of speakers is provided.
An amplifier or the like for outputting an audio signal to the DSP 7 is not shown.
The control unit 6 further sends a light emission signal to an infrared light emitting unit (not
shown).
[0014]
Next, the polarity switching operation for connecting the speaker to the positive electrode will be
described with reference to FIGS. 3 and 4.
The remote controller 1 waits for a phase detection start command to be issued by the key
operation in step S1, sets the number N of speakers, and shifts to step S2.
[0015]
In step S 2, N is decremented and a command for detecting the phase of the N-th speaker is sent
to the main-body light-receiving unit 5. Further, in step S 6, it is determined whether or not
selection of the speaker is completed. In the case (N = 0), the process proceeds to step S21, and if
not completed, the process proceeds to step S7, and a command for detecting the phase of the Nth speaker is transmitted to the main body light receiving unit 5 At step S10, the process waits
for the microphone to receive the reference signal.
[0016]
When the main body control unit 6 receives the phase detection command in step S3, the
process proceeds to step S4 to determine whether the volume value has been changed to the
phase detection level, and if changed, the process proceeds to step S8. If not changed, the
process proceeds to step S5.
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At step S5, the volume value is changed to a phase detection level, and the process proceeds to
step S8.
[0017]
In step S8, the command of the selected speaker is received, and the process proceeds to step S9.
In step S9, a reference signal is output to the speaker that has received the command, and the
process proceeds to step S14.
[0018]
The control unit on the remote controller side determines whether or not the reference signal is
received by the microphone in step S10 within a predetermined time, and when it is received, the
process proceeds to step S11, and when it is not received, the process proceeds to step S20.
[0019]
In step S11, it is determined whether the received reference signal is in the positive phase or in
the negative phase. If the received signal is in the positive phase, the process proceeds to step
S18. If the received reference signal is in the negative phase, the process proceeds to step S12.
At step S18, it is displayed on the display unit 3 that the N-th speaker is connected in the normal
phase, and at step S19, the end of phase detection is displayed, N is decremented, and the
process proceeds to step S6.
[0020]
In step S12, the display unit 3 displays that the N-th speaker is connected in reverse phase, and
in step S13, transmits a command of phase switching to the main body light receiving unit 5, and
in step S17 reception of the command wait.
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[0021]
When the control unit 6 on the main body side receives the phase switching command in step
S14, the phase is switched in step S15, and the phase switching end command is transmitted to
the remote controller in step S16.
When the control unit on the remote controller side receives the phase switching end command
in step S17, the process proceeds to step S2 and the routine after step S2 is repeated.
[0022]
In step S20, the control unit on the remote controller displays that the N-th speaker is not
connected, further decrements N, and shifts to step S6.
[0023]
Also, the control unit on the remote controller side transmits a phase end command to the main
body side in step S21, and ends the operation of the control unit on the remote controller side.
When the control unit 6 on the main body side receives the phase end command in step S22, the
volume value is returned to the original value in step S23, and the operation of the control unit 6
on the main body side is ended.
All the connected speakers are connected to the normal phase by the above operation, and it is
displayed that the unconnected speakers are not connected.
[0024]
According to the sound reproducing apparatus of the present invention, when setting up the
apparatus, connection can be made without regard to the polarity of the speaker.
[0025]
Further, when the speaker is connected in the reverse polarity, it is displayed, so that the user
can recognize that the speaker is connected in the reverse polarity.
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[0026]
Furthermore, even when a part of the system such as a speaker is changed, connection can be
made without minding the polarity of the speaker.
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