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JPH04110094

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH04110094
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
switching system of a plurality of speakers used in an electronic device, and more particularly to
a speaker switching system suitable for selecting a driving speaker in accordance with the
speaker driving condition of the electronic device. About.
[0002]
2. Description of the Related Art Conventionally, a large number of speaker switching systems
have been provided as shown in the block diagram of FIG. In the figure, 10 is an input terminal of
an acoustic signal, 11 is a speaker drive circuit composed of a power amplifier, etc. 12 is a
speaker switching circuit for switching a plurality of speakers, generally composed of a relay
circuit etc. Reference numeral 15 denotes a plurality of speakers connected to the speaker
switching circuit 12. For example, 13 is an A speaker, 14 is a B speaker, 15 is a surround speaker
or the like, and 17 is a speaker switching circuit for controlling the speaker switching circuit 12.
[0003]
Electronic devices, for example, a plurality of speakers connected to an audio device are
connected based on predetermined specific conditions of the audio device, and switching
operation of the speaker switching circuit 17 matched to the specific conditions is carried out.
Multiple speakers can be driven.
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[0004]
That is, the audio signal applied to the input terminal 10 of the acoustic signal is driven by the
speaker drive circuit 11 and is output via the speaker switching circuit 12 which switches and
controls a plurality of speakers.
The speaker switching circuit 12 is controlled by the speaker switching circuit 17 that matches
the conditions of the above-mentioned audio device, and the user can operate the speaker that
the user wants to set.
[0005]
However, since the conventional speaker switching system described above connects the
speakers in accordance with the predetermined specific conditions of the audio device to set the
driving speakers, the user can Was inconvenient that it had to be used in consideration of the
conditions of the equipment.
[0006]
In addition, there is a disadvantage that there is a risk that the temperature of the device may be
increased to damage or destroy the device or the speaker if the device is accidentally used
beyond the drive capability of the device.
[0007]
The present invention has been made in view of the above-described point, and the object of the
present invention is to solve the drawbacks of the prior art and to set the drive speaker by
providing the impedance detection means and / or the number of speakers detection means. It is
about providing a speaker switching system.
[0008]
FIG. 1 is a functional block diagram showing the configuration of the present invention, in which
a plurality of speakers connected to the electronic device output of the present invention are set
by a speaker switching circuit. In the speaker switching system, the impedance detection means
for detecting the setting state of the impedance switching circuit of the speaker output, and the
speaker setting means for setting the driving speaker by the detection data are provided.
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2
[0009]
Further, instead of the above-mentioned impedance detection means, a speaker number detection
means is provided for detecting the setting state of the speaker switching circuit for switching
the speaker connected to the electronic device to detect the number of speakers. And a speaker
setting means for setting.
[0010]
Furthermore, speaker impedance detection means and speaker number detection means are
combined and configured, and a speaker setting means for setting a drive speaker based on the
detection data of these is provided.
[0011]
The operation of the present invention will be described with reference to the functional block
diagram of FIG.
According to this invention, the output impedance of the speaker connected to the electronic
device output is matched to the impedance of the speaker in use by operating the impedance
switching circuit (impedance switching means 1), and the microcomputer setting the impedance
setting of this speaker is detected (Impedance detection means 2).
[0012]
On the other hand, a specific condition such as the speaker drive condition of the audio device in
use is set and stored in advance in the microcomputer (speaker drive condition setting means 6),
and the speaker drive condition is set with the above impedance detection data. The switching
circuit can be controlled to set the drive speaker (speaker setting means 3).
[0013]
Also, in place of the impedance detection means 2, a speaker switching circuit for switching a
speaker connected to an electronic device is operated (speaker connection switching means 4) to
detect a set state of speaker connection and detect the number of speakers. (Speaker number
detection means 5).
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Similarly to the above, the speaker switching circuit can be controlled by this number-of-speakers
inspection data to set the drive speakers (speaker setting means 3).
[0014]
Furthermore, it is possible to set a drive speaker by controlling a speaker switching circuit
according to detection data obtained by combining the speaker impedance detection means 2
and the number-of-speakers detection means 5 (speaker setting means 3).
[0015]
As described above, since the drive speaker can be automatically set under the specific condition
of the device according to the impedance of the speaker and the number of speakers, it is
possible to prevent the damage of the speaker, the device, etc. in advance.
[0016]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a speaker
switching system according to the present invention will be described with reference to FIGS. 1
to 3. FIG.
The same parts as those in the conventional example are given the same reference numerals, and
the description thereof is omitted.
[0017]
FIG. 1 is a functional block diagram of this invention, FIG. 2 is a block diagram of hardware, and
FIG. 3 is a flow chart for explaining the operation. In the figure, 16 is an impedance switching
circuit for switching and setting the impedance of the speaker, 18 Is a microcomputer that
controls each part.
[0018]
An electronic device such as an audio device can connect a plurality of speakers to enjoy stereo
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sound and surround reproduction sound.
For example, the speaker output circuit of the audio apparatus of FIG. 2 is an embodiment in
which the speakers 13, 14, 15 are switched and set by the speaker switching circuit 12. The
switching setting of the speakers 13, 14, 15 is the impedance or And the number of driving
speakers.
[0019]
The impedance of the speaker connected to the audio device can be set by the impedance
switching circuit 16, and the speaker switching circuit 17 can be used as a speaker to which the
user wishes to make sound out of a plurality of speakers connected to the audio device. The
microcomputer 18 can determine the set state of the impedance of these speakers and the
number of driven speakers to perform impedance detection and speaker number detection.
[0020]
On the other hand, the speaker drive conditions for the audio device in use are stored in advance
in the microcomputer 18 built in the audio device, and the speaker switching circuit 12 is
controlled according to the speaker drive conditions to set the drive speaker according to the
detection data. be able to.
[0021]
The speaker setting operation will be described with reference to the flowchart of FIG.
It is judged whether the impedance of the speaker used is 8 ohms (hereinafter represented by Ω)
or 4 Ω (steps S1 and S8). If the impedance is 8 Ω, turning on the A speaker 13 key (step S2),
The A speaker 13 is connected by the speaker switching circuit 12, and the A speaker 13 is
turned on (step S3).
[0022]
When the user sets the A speaker 13 to OFF and the B speaker 14 key to ON (step S5), the B
speaker 14 is connected by the speaker switching circuit 12 and the B speaker 14 is turned ON
(step S5) S6).
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[0023]
If the impedance of the speaker is set to 8 Ω, the microcomputer 18 detects the impedance 8 Ω
and turns the surround speaker 15 off (step S4).
[0024]
When the impedance is set to 4 Ω (step S8), when the A speaker 13 key is turned on (step S9),
the A speaker 13 is connected by the speaker switching circuit 12 and the A speaker 13 is turned
on (step S8) S10) Further, when the B speaker 14 key is turned on (step S11), the B speaker 14 is
also connected by the speaker switching circuit 12 and turned on.
However, when both the A and B speakers 13 and 14 are turned ON, the microcomputer 18
automatically sets the surround speaker 15 OFF according to the speaker driving condition (step
S12).
[0025]
When the A speaker 13 is ON and the B speaker 14 is OFF, when the surround speaker 15 key is
turned ON (step S13), the surround speaker 15 is connected by the speaker switching circuit 12
and the surround speaker 15 is turned ON. If the surround speaker 15 key is off, the surround
speaker 15 is turned off (step S15). In this case, only the A speaker 13 is turned on.
[0026]
When the A speaker 13 is off at step S9 and the B speaker 14 key is turned on (step S16), the B
speaker 14 is connected by the speaker switching circuit 12 and the B speaker 14 is turned on
(step S17) The surround speaker 15 can be turned on / off by operating the surround speaker 15
key (steps S13, 14, 15).
[0027]
Furthermore, when the A and B speakers 13 and 14 are set to OFF in step S16, the surround
speaker 15 key can be operated to turn on / off in the same manner as described above (steps
S13, 14 and 15). And the surround speaker 15 can be connected by the speaker switching circuit
12).
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[0028]
The above embodiment is an example of operation based on one speaker drive condition
according to the speaker drive capability of the audio device, and speaker switching is also
performed according to the speaker drive condition desired by the user preset in the
microcomputer 18 It is possible to construct a switching system capable of selecting and setting
an arbitrary speaker by the speakers connected to the circuit 12.
[0029]
In the above embodiment, the speaker switching circuit 12 is controlled by combining the
speaker impedance detection means 2 and the number-of-speakers detection means 5, but it is
natural that only one of the above detection means is used. Control is also possible.
[0030]
As described above, the speaker switching system according to the present invention can switch
and drive any desired plurality of speakers in accordance with the speaker drive capability of the
audio device. There is an effect that breakage or destruction of the device output circuit or the
speaker can be prevented.
[0031]
In addition, the power source transformer in the audio device can be prevented from rising in
temperature due to an excessive speaker drive, and the thermal damage to the power source
transformer can be prevented. .
[0032]
Furthermore, there is an effect that the user does not have to consider the speaker driving
conditions of the audio device for driving the plurality of speakers, and the handling of the device
becomes easy.
[0033]
Moreover, it has excellent features such as simple structure and low cost because it can be easily
implemented.
[0034]
Brief description of the drawings
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[0035]
1 is a functional block diagram showing the configuration of the speaker switching system of the
present invention.
[0036]
2 is a block diagram of the main part of the hardware showing the embodiment of FIG.
[0037]
It is the flowchart which showed the operation | movement of FIG. 3 Example.
[0038]
4 is a block diagram of the main part showing a conventional example.
[0039]
Explanation of sign
[0040]
10 Sound signal input terminal 11 Speaker drive circuit 12 Speaker switching circuit 1213 A
Speaker 14 B Speaker 15 Surround speaker 16 Impedance switching circuit 17 Speaker
switching circuit 18 Microcomputer
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