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JPH11234792

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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 JPH11234792
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker switched electronic device, and more particularly to a speaker switched electronic device
having a switching function between an internal speaker and an external speaker.
[0002]
2. Description of the Related Art Among electronic devices such as a wireless communication
device and a receiver in which a speaker is built in, many electronic devices have a function of
connecting an external speaker. Some of such electronic devices have a function of switching an
internal speaker and an external speaker as appropriate, or enabling both speakers to operate
simultaneously.
[0003]
Examples of the configuration of a conventional speaker-switched electronic device of this type
are shown in FIGS. In FIGS. 4 to 6, the components denoted by the same reference numerals have
similar functions.
[0004]
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1
In the speaker-switched electronic device shown in FIG. 4, an audio signal in which the reception
signal received by the antenna ANT is subjected to reception processing by the reception circuit
1 is obtained. This audio signal is divided by the variable volume VR 1, and the divided output is
amplified by the audio amplifier 2. The audio signal amplified by the audio amplifier 2 is sent out
to the internal speaker 9 through the operation (closing) of the switch circuit of the switch jack
with speaker switch 11 and output as audio.
[0005]
On the other hand, the external speaker is connected to the plug 12 for connection to the main
unit, and when the plug 12 is inserted into the speaker jack 11, the switch circuit is opened to
disconnect the internal speaker 9 from the circuit and the internal speaker 9 does not operate
(OFF), and the external speaker 10 operates (ON).
[0006]
In the speaker switching type electronic device shown in FIG. 5, a pair of electronic switches 5
and 6 which are turned on / off by a control signal from the microcomputer 4 are provided on
the output side of the variable volume VR1.
[0007]
The microcomputer 4 is provided with a speaker selection switch SW1. When the selection
switch SW1 is turned on, the electronic switch 5 is turned on, the electronic switch 6 is turned
off, the internal speaker 9 is operated, and the external speaker 10 is not operated. Output a
control signal that
When the selection switch SW1 is in the OFF operation, the operation reverse to the above is
performed.
[0008]
In the speaker-switched electronic device shown in FIG. 6, audio amplifiers 2 and 3 are
connected between the electronic switches 5 and 6, the internal speaker 9 and the external
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2
speaker 10, respectively.
Similarly to the above, the control switch SW1 of the microcomputer 4 is turned on to turn on
the electronic switch 5 and output a control signal to turn off the electronic switch to operate the
internal speaker 9 to turn off the external speaker 10. To operate. When the selection switch
SW1 is OFF, the operation reverse to the above is performed.
[0009]
SUMMARY OF THE INVENTION The above-described conventional speaker-switched electronic
device has the following problems. That is, although the speaker-switched electronic device
shown in FIG. 4 is widely used, it is not possible to simultaneously operate (sound) both speakers.
Further, since the jack is a mechanical switch, there is a limit to the number of wires, and it is
difficult to cope with the case where the external speaker side is provided with functions such as
a remote switch, an LED display, and a microphone.
[0010]
Further, in the speaker-switched electronic device shown in FIG. 5, when the outputs of the audio
amplifiers 2 and 3 are large, the amplitude may be larger than the control voltage of the
electronic switches 5 and 6. In this case, the electronic switch There is a risk that it will not work
properly and distortion will increase. Therefore, only power of amplitude sufficiently smaller
than the control voltage can be used. For example, assuming that the output voltage of audio
amplifiers 2 and 3 is 4 W at maximum, the effective value of the voltage at 8 Ω load is √ (4 W
× 8 Ω) = 5.66 V, and its amplitude is 22 (2 × 5.66) = 16 Vp-p, which is far beyond the voltage
5 v controlled by a general microcomputer.
[0011]
Furthermore, in the speaker switching type electronic device shown in FIG. 6, since ON / OFF of
the internal speaker and the external speaker can be set independently, both speakers can be
operated at the same time, and audio output at high volume can be performed. It will be. In
addition, since the input of the audio amplifier is switched, the voltage applied to the electronic
switch does not exceed the control voltage and operates stably. However, since two sets of audio
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3
amplifiers and electronic switches are required, mounting space and cost problems arise.
[0012]
Therefore, an object of the present invention is to provide a speaker-switched electronic device
that is not only capable of operating the internal and external speakers independently or
simultaneously but is also simple in configuration and advantageous in mounting space and cost.
[0013]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the speakerswitched electronic device according to the present invention has the following characteristic
configuration.
[0014]
(1) For each system of audio signals divided into at least two systems, an electronic volume
whose attenuation amount is controlled by a control signal is provided, and an audio amplifier
corresponding to the output side of the electronic volume is provided and internally An audio
signal is output to a speaker and an external speaker, and a control signal for giving an
attenuation equivalent to turning OFF the electronic volume corresponding to the OFF speaker
among the internal speaker and the external speaker is output. Speaker switched electronic
device characterized in that.
[0015]
(2) For each system of audio signals divided into at least two systems, an electronic volume
whose attenuation amount is controlled by a control signal is provided, and an audio amplifier
corresponding to the output side of the electronic volume is provided, A speaker switching type
electronic device having a configuration for outputting an audio signal to a speaker and an
external speaker, and outputting a control signal for causing both the internal speaker and the
external speaker to operate normally.
[0016]
(3) It has a detection circuit that detects that the external speaker is connected, and when it
detects that the external speaker is connected, a control signal to turn off the operation of the
internal speaker is output to the corresponding electronic volume The speaker switching type
electronic device according to claim 1.
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[0017]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the
speaker switched electronic device according to the present invention will be described in detail
with reference to the drawings.
[0018]
FIG. 1 is a block diagram showing an embodiment of a speaker-switched electronic device
according to the present invention.
In FIG. 1, components provided with the same reference numerals as those shown in FIGS. 4 to 6
are components performing similar functions and operations.
[0019]
In the present embodiment, the reception signal from the antenna ANT is subjected to reception
processing by the reception circuit 1 and is input to the electronic volumes 7 and 8 provided
corresponding to the internal speaker 9 and the external speaker 10.
The electronic volumes 7 and 8 are controlled by a control signal from the microcomputer 4, and
attenuate the input signal with an attenuation amount according to the control signal and output
it.
The outputs of the electronic volumes 7 and 8 are sent to the audio amplifiers 2 and 3 and
amplified, and then output from the internal speaker 9 and the external speaker 10 as audio.
As shown in FIG. 2, the electronic volumes 7 and 8 output an output voltage Vo obtained by
dividing the input voltage Vi in proportion to setting data (for example, 0 to 16).
That is, there is an input / output relationship such as Vo = Vi × (setting data / setting data
maximum value).
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[0020]
An operation example of the electronic volumes 7 and 8 is shown in the form of a table as
numerical values when specific values are given to the setting data, the input voltage Vi and the
output voltage Vo, respectively.
Therefore, for example, when the setting data is 0, it is easily understood that the output voltage
is also 0.
[0021]
In the present embodiment, a variable volume VR1 is provided between the power supply line
and the ground, and the divided voltage is converted into an analog signal by the D / A converter
14 according to the volume value, and is output to the microcomputer 4. The microcomputer 4
supplies electronic volume control data to the electronic volumes 7 and 8 in proportion to the
input volume value. The electronic volumes 7 and 8 attenuate and output the input signal based
on the electronic volume control data thus supplied.
[0022]
The microcomputer 4 is provided with a switch SW1 having three contacts a, b and c. (A) When
the contact a is selected, when the internal speaker 9 is (B) When the contact b is selected, when
the external speaker 10 is (C) when the contact c is selected Controls the electronic volume 7 and
8 so that both the internal speaker 9 and the external speaker 10 operate respectively.
[0023]
That is, in the case of (A), since the internal speaker 9 is turned on and the external speaker 10 is
turned off, the electronic volume 7 has data corresponding to the output from the D / A
converter 14 from the microcomputer 4. The electronic volume 8 is supplied with data "0" to
make its output 0. In the case of (B), since the external speaker 10 is turned on and the internal
speaker 9 is turned off, data "0" is supplied to the electronic volume 7 to make its output 0, and
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the electronic volume 8 is turned on. Are supplied with data corresponding to the output from
the D / A converter 14. In the case of (C), since both the internal speaker 9 and the external
speaker 10 are turned on, data corresponding to the output from the D / A converter 14 from the
microcomputer 4 is supplied to the electronic volume 7 and 8 Ru.
[0024]
According to the above configuration, in the present invention, switching between the internal
speaker and the external speaker can be easily performed without providing a new electronic
switch.
[0025]
In the present embodiment, the external speaker detection circuit 13 for detecting the
connection of the external speaker is also provided, and the external microphone is connected
when the contact a or b of the switch SW1 is selected. It is possible to switch to an external
speaker automatically.
[0026]
More specifically, the connector terminal to which the external speaker detection circuit 13 of
the external speaker 10 is connected is grounded, and the input of the external speaker detection
circuit 13 has a pull-up configuration.
Therefore, when the external speaker is connected, the input line of the external speaker
detection circuit 13 falls below the specific voltage, so if the voltage of the input line is higher
than the specific voltage, it can be determined that the external speaker is not connected. If the
voltage is lower than the specific voltage, it can be determined that the external speaker is
connected.
[0027]
The microcomputer 4 receives the detection result of the external speaker detection circuit 13,
and when it is determined that the external speaker is connected, sends out data "0" to the
electronic volume 7 to turn off the internal speaker 9, Data corresponding to the output from the
D / A converter 14 is supplied to the volume 8 to turn on the external speaker 10.
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[0028]
In the above description of the embodiment, the pull-up of the detection circuit 13 may of course
be a pull-down.
Although one variable volume VR1 is provided in FIG. 1, two volumes may be provided to
independently set the volume of the internal speaker and the external speaker.
Furthermore, the switch SW1 is an electronic switch, and can be switched by the microcomputer
4 or selected on the menu screen. Furthermore, since the internal speaker and the external
speaker are switched without using a mechanical switch, it is possible to mount a plurality of
remote switches, an external microphone, an LED display, etc. on the external speaker side.
Further, although the reception signal has been described as two systems, if the electronic
volume is provided as two or more systems, further expandability can be obtained.
[0029]
As described above, according to the speaker switching type electronic apparatus of the present
invention, the following remarkable effects can be obtained. That is, since the internal speaker
and the external speaker are respectively performed by the electronic volume, it is not necessary
to newly provide a separate switch, which is advantageous not only in terms of cost but also
enables space saving. In addition, since the switching function is provided on the input side, it is
not necessary to switch the large amplitude on the output side, and the configuration is low and
distortion is simple. Furthermore, since the audio amplifier and the electronic volume are
provided in two systems, both the internal speaker and the external speaker can be turned on
simultaneously, and independent volume control can be performed.
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