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JPH0541898

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DESCRIPTION JPH0541898
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio apparatus, and more particularly to an audio apparatus connectable to an audio signal
such as an earphone, a bed phone and a speaker.
[0002]
2. Description of the Related Art Generally, an acoustic device to which a converter such as an
earphone, a bed phone and a speaker can be connected is selected and used according to the use
situation or the user's preference in consideration of the type of the converter. It is useful when
removing unnecessary conversion devices and making them smaller and lighter for carrying.
[0003]
FIG. 3 shows a block diagram of an example of a conventional acoustic device.
In FIG. 3, this conventional example is directed to the first conversion device 6 which is
attachable to and detachable from the acoustic device body, the second conversion device 7
which is not attachable to and detachable from the acoustic device body, and the first conversion
device 6. It comprises the detection device 8 which detects the presence or absence of
attachment or detachment, and the switching device 9 which switches the output destination of a
sound signal.
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[0004]
In FIG. 3, first, when the first conversion device 6 is not attached to the audio device, the sound
signal 108 input to the switching device 9 is output as the sound signal 110, and the second
conversion device 7 is output. Input and output. In this case, the sound signal 109 is not output
from the switching device 9 due to the switching action of the switching device 9. Next, when the
first conversion device 6 is connected to the sound device, the first conversion device 6 outputs
the attachment / detachment signal 111 indicating that the conversion device is attached to the
sound device, and the detection device 8 is input. Be done. The detection device 8 receives the
attachment / detachment signal 111, detects attachment of the first conversion device 6 to the
acoustic device, generates the switching control signal 112, and outputs the switching control
signal 112 to the switching circuit 9. The switching circuit 9 is controlled by the switching
control signal 112, and the input sound signal 108 is output as the sound signal 109, input to
the first conversion device 6, and output. Then, in this case, the sound signal 110 is not output to
the second conversion device 7.
[0005]
Generally, among different types of conversion devices such as speakers and earphones, the
conversion efficiency from an electrical signal to an acoustic signal is different due to the
difference in impedance or the like. Nevertheless, in the conventional audio device to which these
conversion devices can be connected, when switching the conversion device of the output
destination, the sound signal is output at the same volume level as it is, so the conversion device
In some cases, there is a use drawback in that a loud sound is suddenly output or a small sound
is heard, which makes it difficult to hear.
[0006]
An acoustic apparatus according to the present invention is an acoustic apparatus such as
earphones, headphones or speakers, which can be connected with various conversion
apparatuses for converting an electrical signal into an acoustic signal, wherein the sound of the
conversion apparatus is A connection detection circuit that detects a connection to the device
and outputs a predetermined connection detection signal, and outputs a predetermined volume
adjustment control signal via the connection detection signal from the connection detection
circuit, and an input sound signal A switching circuit for switching and outputting the output
destination of the sound signal to the conversion device connected to the sound device, and
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adjusting a volume level of a predetermined sound signal to be input via the volume adjustment
control signal, the switching circuit And at least a volume control unit for outputting the signal.
[0007]
Next, the present invention will be described with reference to the drawings.
[0008]
FIG. 1 is a block diagram showing an embodiment of the present invention.
As shown in FIG. 1, in this embodiment, a first conversion device 1 detachable from an acoustic
device body, a second conversion device 2 not detachable from an acoustic device body, and a
first conversion device 1 includes a connection detection circuit 3 for detecting presence /
absence of attachment / detachment to the main body, a switching circuit 4 for switching the
output destination of the sound signal, and volume control means 5 for adjusting and outputting
the volume of the input sound signal Be done.
[0009]
In FIG. 1, first, when the first conversion device 1 is not attached to the sound device, the sound
signal 101 input to the volume adjustment means 5 has a volume that matches the conversion
efficiency of the second conversion device. The signal is adjusted and output as the sound signal
102 and input to the switching circuit 4.
In the switching circuit 4, the sound signal is output as a sound signal 130 and is input to and
output from the second conversion device 2. In this case, the switching circuit 103 does not
output the sound signal 103 due to the switching action of the switching circuit 4. Next, when
the first conversion device 1 is attached to the audio device, the first conversion device 1 outputs
the attachment / detachment signal 105 indicating that the conversion device is attached to the
audio device, and the connection detection circuit 3 is output. It is input. The connection
detection device 3 receives the attachment / detachment signal 105, detects attachment of the
first conversion device 1 to the acoustic device, generates a connection detection signal 106, and
outputs the signal to the switching circuit 4. The switching circuit 4 is controlled by the
connection detection signal 106 to output the volume control signal 107 to the volume adjusting
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means 5 and performs a sound signal switching operation on the sound signal 102 inputted from
the volume adjusting means 5. In the volume control means 5, the input sound signal 101 is
reduced to a predetermined volume level via the volume control signal 107, and then the volume
level is gradually increased, and the volume level preset after a predetermined time. Will be
returned to The volume-adjusted sound signal 102 output from the volume adjustment means 5
is input to the switching circuit 4 and is output as the sound signal 103 via the above-described
switching operation, and is input to the first conversion device 1 and output. Be done. Then, in
this case, the sound signal 103 is not output to the second conversion device 2.
[0010]
Next, the operation of the volume control means 5 will be described with reference to FIG. In FIG.
2, L on the vertical axis (volume level) is a predetermined setting level, and L0 indicates a
predetermined volume level to be reduced when the output destination is switched. Further, t0 of
the horizontal axis (time) is the timing of output destination switching, and T indicates the time
required for the volume level return. That is, as shown in FIG. 2, the output volume level is
reduced to L0 in synchronization with the timing t0 of output destination switching, and then
gradually raised, and after a predetermined recovery time T, the original set level Return to L. By
adjusting the volume level in this way when switching the output destination, a sudden change in
the sound output from the conversion device can be prevented in advance.
[0011]
As described above, according to the present invention, sudden change in the sound output from
the conversion device can be prevented in advance by appropriately adjusting the volume of the
sound signal when the output device is switched to the conversion device. Have the effect of
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