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DESCRIPTION JP2004289724

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DESCRIPTION JP2004289724
The present invention provides an acoustic device in which a volume is set to a predetermined
value or lower than a predetermined value when an offset voltage is detected. The acoustic
device prevents the offset voltage from being output to the speaker 4 by detecting the offset
voltage generated in the output circuit 3 and stopping the output circuit 3, and when the offset
voltage is detected. The volume control means 2 is detected by the volume control means 2 to
determine whether the volume value is a predetermined value, and the volume control means 2
is controlled to be a predetermined value or less if the volume value is a predetermined value or
more. Even if the power of the acoustic device is turned on again without noticing that the output
circuit 3 is stopped due to the detection of the offset voltage, no loud sound is output from the
speaker 4, so the speaker It is possible to prevent the life of 4 and the user from feeling
uncomfortable. [Selected figure] Figure 1
Sound equipment
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic device in which the volume is set to a predetermined value or lower than a
predetermined value when a DC voltage (hereinafter referred to as an offset voltage) generated in
an output circuit is detected. 2. Description of the Related Art In this type of acoustic device, for
example, water, metal or the like infiltrates into the device, causing a short circuit in the
periphery of the power IC provided in the output circuit, or an output of the power IC If the value
of V becomes excessive, an offset voltage is output to the speaker, which may affect the life of the
speaker, or a loud sound may be output from the speaker. Therefore, as a conventional acoustic
device, a protection circuit is proposed in which the output circuit is shut off when the offset
voltage generated in the output circuit is detected, and the offset voltage is not output to the
speaker (eg, for example) Patent Document 1). [Patent Document 1] Japanese Patent Application
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Laid-Open No. 9-162649 (Paragraph 0007) [0005] In the conventional audio amplifier
protection circuit, a power relay is disposed on the primary side of the power supply section of
the audio amplifier. When the audio amplifier is in the power-on state, if an excessive current or
offset voltage flowing in the output stage of the power amplifier is detected, the power relay is
turned off to cut off the primary side of the power supply section. It protects the speaker from
excessive current and offset voltage. SUMMARY OF THE INVENTION However, in the abovementioned conventional acoustic device, the output circuit is interrupted by detecting the offset
voltage generated in the output circuit to protect the speaker. There are the following problems.
That is, when the user using the sound device cuts off the output circuit due to the offset
generated in the output circuit and the sound can not be output from the speaker, the user often
does not know the cause. In many cases, the power of the audio device is turned on again while
raising the volume by the volume, in order to increase the volume, and as a result, a loud sound
is output from the speaker, which affects the life of the speaker or the user. Problems such as
giving a sense of discomfort arise. The present invention has been made to solve such
conventional problems, and provides an audio device in which the volume is set to a
predetermined value or lower than a predetermined value when an offset voltage is detected.
However, it is an object of the present invention to prevent in advance the damage or the output
of a loud sound from the speaker.
SUMMARY OF THE INVENTION In order to achieve the above object, an acoustic device
according to the present invention stops an output to a speaker by detecting an offset voltage
generated in an output circuit and interrupting the output circuit. Sound device configured to
detect a volume value when the offset voltage is detected, and a volume value that is detected by
the volume adjustment means to determine whether the volume value is a predetermined value,
and the volume value is equal to or more than the predetermined value In the case of the above,
it is characterized in that it comprises: a control means for controlling the volume adjustment
means so as to have a predetermined value or a predetermined value or less. With the above
configuration, even when the power of the acoustic device is turned on again without noticing
that the output circuit is shut off due to the detection of the offset voltage, a loud sound is not
output from the speaker. It is possible to prevent in advance the influence on the life and the
discomfort to the user. Further, in order to achieve the above object, the control means in the
audio apparatus of the present invention detects the offset voltage generated in the output
circuit, the volume value of the volume adjusting means becomes a predetermined value or less
than the predetermined value. Is configured to control. With the above configuration, the volume
value of the volume adjusting means becomes equal to or less than the predetermined value at
the time of detection of the offset voltage, so that the offset voltage is erroneously detected again
when the power of the acoustic apparatus is turned on again. Detection can be prevented. In
order to achieve the above object, the control means of the acoustic device of the present
invention detects the offset voltage generated in the output circuit and shuts off the output
circuit, and then the power of the acoustic device is turned on again. It is characterized in that
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control is performed so that the volume value of the adjustment means is equal to or less than a
predetermined value or a predetermined value. According to the above-mentioned configuration,
even if the user increases the volume of the volume control means after the output circuit is shut
off, the erroneous detection such as the offset voltage being detected again when the power of
the acoustic device is turned on again is prevented. be able to. In order to achieve the above
object, the control means of the audio device of the present invention is characterized in that
control is performed so as to stop the output to the speaker when the offset voltage generated by
the output circuit continues for a predetermined time or more. It is According to the above
configuration, even if a clip is detected due to the temporary input of an excessive signal to the
output circuit, the output to the speaker is not stopped unless a predetermined time elapses, so
the sound is interrupted by the detection of the clip. Can be prevented.
DETAILED DESCRIPTION OF THE INVENTION A first embodiment of the present invention will be
described in detail with reference to the drawings shown in FIG. 1 and FIG. FIG. 1 is a block
diagram showing the configuration of the audio apparatus, and FIG. 2 is a flowchart showing the
operation. The audio apparatus shown in FIG. 1 has a source (sound source) 1 for receiving a
radio or reproducing media such as a CD, and an audio signal output from the source 1
comprises an electronic volume or the like. After the volume is adjusted by the volume
adjustment means 2, the signal is amplified by the output circuit 3 configured by the power IC
and output to the speaker 4. The volume control means 2 and the output circuit 3 are connected
to a control means 5 comprising a microcomputer, and the control means 5 adjusts the volume
of the volume control means 2, and the control means 5 is an output circuit 3. Constantly
monitors the offset detection port of the power IC that makes up the output IC, detects the offset
voltage generated in the output circuit 3, and controls the standby port of the power IC if the
offset voltage continues for a predetermined time or more. At the same time as 3 is stopped, it is
displayed on the display means 6 that the offset voltage is detected. Next, the operation of the
sound device configured as described above will be described with reference to the flowchart
shown in FIG. During operation of the acoustic device, the offset voltage generated in the output
circuit 3 is constantly monitored by the control means 5, and the control means 5 generates the
offset voltage in the output circuit 3 for some reason. When the offset voltage is detected in step
S1 and the offset voltage continues for a predetermined time or more, the control means 5 shuts
off the output circuit 3 in step S2. Thereafter, the process proceeds to step S3, and the volume
value when the offset voltage is detected is detected by the volume adjustment means 2, and it is
determined whether the volume value is, for example, 13 or less of a predetermined value (initial
value). If it is in the range of 14 to 33, for example, the process proceeds to step S4. The control
means 5 controls the volume adjustment means 2 so that the volume value of the volume
adjustment means 2 becomes 13 or less of the predetermined value in step S4, and then
proceeds to step S5 to indicate that the offset voltage is detected. Displayed on the display means
6. If it is determined in step S3 that the volume value at the time of offset voltage detection is 13
or less, the process proceeds to step S5 with the volume value held, and it is displayed on display
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unit 6 that the offset voltage is detected. indicate.
As a result, the user can recognize that the offset voltage has been generated for some reason by
looking at the display means 6, and the cause can be easily removed. On the other hand, when
the offset voltage is detected and the output circuit 3 is stopped and the user turns on the power
of the acoustic device again, the volume value of the volume adjusting means 2 is set in advance
to a predetermined value, eg, 13 in step S3. Therefore, an excessive current is not output from
the output circuit 3 to the speaker 4, whereby the speaker 4 is damaged due to the excessive
current, or a loud sound is output from the speaker 4 to make the user uncomfortable. Can be
prevented in advance. Also, if the user turns on the power supply of the acoustic device without
detecting the offset voltage and detecting that the output circuit 3 is stopped or if the user does
not remove the cause, the offset voltage is detected again. Since the output circuit 3 is cut off and
the display means 6 displays that the offset voltage has been detected, it is sufficient to remove
the cause and then turn on the power of the acoustic device again. FIGS. 3 and 4 show a second
embodiment of the present invention, which will be described next. The same parts as those of
the first embodiment are designated by the same reference numerals, and the description thereof
will be omitted. In the first embodiment, when the offset voltage generated in the output circuit 3
is detected, the volume value of the volume adjusting means is set to a predetermined value, eg,
13. However, in the second embodiment After the control means 5 detects the offset voltage
generated in the output circuit 3 and the output circuit 3 is stopped, the volume value of the
volume adjustment means 2 is set to a predetermined value of 13 when the power of the acoustic
device is turned on again. The operation at that time will be described with reference to the flow
chart shown in FIG. After the offset voltage is detected in the output circuit 3 and the output
circuit 3 is stopped, when the user repowers on the acoustic device in step S11, the control
means 5 detects the offset voltage in step S12. The volume value is detected by the volume
adjustment means 2 and it is determined whether the volume value is, for example, 13 or less of
a predetermined value (initial value). The control means 5 controls the volume adjustment means
2 so that the volume value of the volume adjustment means 2 becomes 13 or less of the
predetermined value in step S13, and then proceeds to step S15. If it is determined that the
volume value is determined in step S14, the process proceeds to step S15 with the volume value
held.
After the control means 5 controls the standby port of the power IC constituting the output
circuit 3 in step S15 to put the output circuit 3 into operation, the control means 5 proceeds to
step S16 and detects the offset voltage generated in the output circuit 3 To start. Thus, as in the
first embodiment, even if the power of the acoustic device is turned on again without noticing
that the output circuit 3 is stopped due to the detection of the offset voltage, the volume is louder
than that of the speaker 4 Since no sound is output, it is possible to prevent the life of the
speaker 4 from being affected and the user from feeling uncomfortable. In the first embodiment,
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when the offset voltage generated in the output circuit 3 is detected, the volume value of the
volume adjusting means is set to a predetermined value, and in the second embodiment, the
output circuit 3 is After the control means 5 detects the offset voltage generated in the above and
the output circuit 3 is cut off, the volume value of the volume adjustment means 2 is set to a
predetermined value when the power of the acoustic device is turned on again. Of course, both
controls may be performed together. As described above in detail, according to the present
invention, the volume value when the offset voltage generated in the output circuit is detected is
detected by the volume control means, and it is determined whether the volume value is a
predetermined value. Since the volume control means is controlled so that the volume value
becomes equal to or less than the predetermined value when the volume value is equal to or
more than the predetermined value, the acoustic device is not aware that the output circuit is
stopped due to the detection of the offset voltage. Even when the power is turned on again, no
loud sound is output from the speaker, so it is possible to prevent the life of the speaker from
affecting the user and to make the user uncomfortable. . BRIEF DESCRIPTION OF THE
DRAWINGS FIG. 1 is a block diagram of an acoustic device according to a first embodiment of the
present invention. FIG. 2 is a flow chart showing the operation of the acoustic device according to
the first embodiment of the present invention. FIG. 3 is a block diagram of an acoustic device
according to a second embodiment of the present invention. FIG. 4 is a flow chart showing the
operation of the acoustic device according to the second embodiment of the present invention.
[Explanation of mark] 1 source 2 volume control means 3 output circuit 4 speaker 5 control
means 6 display means
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