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JPH07212900

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Notice
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 JPH07212900
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
volume control apparatus for an on-vehicle audio device, and in particular, controls the volume of
various audio devices mounted on a vehicle when the circuit power is turned on. Relates to a
volume control device.
[0002]
2. Description of the Related Art FIG. 4 is a flow chart for explaining the operation of an example
of a conventional volume control apparatus for a car audio system. A central processing unit
(CPU) mounted on the vehicle monitors whether or not the power switch of the vehicle is pressed
(step 401). Then, when it is determined that the power switch is not pressed, the CPU checks
whether the circuit power is currently on or not (step 402).
[0003]
Thereby, if it is not in operation, whether or not the power switch is pressed again is monitored,
and when it is in operation, there is a change in volume level due to the volume operation of the
car audio equipment (for example, radio, cassette deck, etc.) It is determined whether or not (step
403). When it is determined that there is a change in the volume level, the volume level after the
change is written to the first memory, that is, the volume level setting memory (step 404).
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[0004]
On the other hand, when it is determined in step 401 that the power switch is pressed, it is
checked whether the circuit power is turned on (in operation) or not (step 405). A power off
process is performed (step 406). If it is determined in step 405 that the circuit is not in
operation, power on processing is performed to turn on the circuit power (step 407). That is, the
power supply switch is a circuit power supply switch of the on-vehicle audio device, and the
circuit power supply is alternately turned on or off each time the power supply switch is pressed.
[0005]
After the power on process is performed in the above step 407, the volume level of the audio
device is the volume level during the operation immediately before the power off written in the
volume level setting memory in the above step 404. The level is set (step 408). Therefore, in the
conventional volume control device, when the power is turned on, the volume level of the audio
device is set to the volume level before the power is turned off.
[0006]
However, in the above-described conventional volume control apparatus, when the power is
turned on, it is always set to the volume level before the power is turned off regardless of the
volume level before the power is turned off. If you are listening to a large volume before turning
off the power, when you turn on the power next time, the audio signal is reproduced and output
at a volume much higher than the volume intended by the passenger, and the volume is reduced
slowly and annoyingly. There is a disadvantage such as hindering the safety of driving.
[0007]
Conventionally, when the power is turned on, when the volume at the previous power-off is equal
to or higher than the set level, the vehicle sound device for starting the operation with a
relatively small volume and reducing the discomfort given to the passenger Are also known
(Japanese Patent Application Laid-Open No. 4-160900).
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However, in this conventional audio device, when the volume at the previous power off is equal
to or higher than the set level, the output volume at the power on is set to a volume level smaller
than the set level (a fraction of the output volume). In order to lower the volume, when the
volume at the previous power-off is at a level slightly above the set level, the volume at the time
of power-on is lowered more than necessary, which is troublesome.
[0008]
SUMMARY OF THE INVENTION The present invention has been made in view of the abovedescribed problems, and an object thereof is to provide a volume control device of a car-mounted
audio device capable of eliminating the inconvenience of the operator and performing safe
driving.
[0009]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
provides a detection means for detecting whether or not the circuit power of an audio device
mounted on a vehicle is switched from the off state to the on state; A first memory for storing a
volume level at the time of operation, and a comparison means for reading out the stored volume
level from the first memory and comparing it with a fixed value when it is detected by the
detection means that the circuit power is turned on. When the storage volume level is
determined to be greater than a predetermined value by the comparison means, the volume level
is forcibly set to a predetermined fixed volume level, and when the storage volume level is
determined to be less than a predetermined value, storage is performed. And a volume level
setting unit configured to set the volume level as it is to the volume level.
[0010]
According to the second aspect of the present invention, the electronic apparatus further
comprises a second memory for storing the power-on volume level which is arbitrarily set at the
time of operation of the audio device, and the circuit power is turned off by the detecting means
as the comparing means. When it is detected that it is turned on, the stored volume level read out
from the first and second memories is compared with the volume level at power on, respectively,
and the stored volume level is set to the stored volume level setting means. When the volume
level is higher than the volume level at power on, the volume level is forcibly set to the volume
level at power on, and when the stored volume level is lower than the volume level at power on,
the stored volume level is directly set to the volume level It is
[0011]
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According to the first aspect of the present invention, when the circuit power is turned on from
off, the volume level before power-off read from the first memory and the fixed value are
compared by the comparison means. When the volume level before the power-off is larger than a
predetermined value, the volume level setting means forcibly sets the volume level to a fixed
volume level predetermined.
Therefore, it is possible to prevent the output of a large volume inadvertently when the power is
turned on.
[0012]
Further, according to the second aspect of the present invention, since the volume level to be
compared with the volume level before the power-off can be made to be an arbitrary power-on
volume level written in the second memory by the comparison means The degree of freedom of
the sound volume level can be improved as compared with the prior art.
[0013]
EXAMPLES Examples of the present invention will now be described.
[0014]
FIG. 1 shows a block diagram of an embodiment of the present invention.
In FIG. 1, a control unit 1 has a central processing unit (CPU) and a readable / writable memory,
controls control of various audio devices in a car, and realizes volume control by software
processing.
In addition, a CD changer 2 and a radio / television unit / cassette deck unit 3 are provided as
vehicle-mounted audio devices.
[0015]
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The CD changer 2 is an audio device that accommodates a plurality of compact discs (CDs) in a
housing and automatically plays a CD of which a passenger of the vehicle arbitrarily selects.
However, the CD changer does not necessarily contain all the number of CDs that can be
accommodated, and the accommodation positions are not necessarily in order.
For example, in a CD changer capable of accommodating 10 CDs, there are cases where three
CDs are accommodated first, second, and fifth.
[0016]
The display and operation unit 4 is a man-machine interface that performs various mode displays
and operations of various audio devices, and is installed in a place that can be easily viewed and
operated by the driver. The electronically controlled volume unit 5 variably controls output audio
signal levels of various audio devices in accordance with a control signal from the control unit 1.
The power amplifier unit 6 amplifies the power of the output sound signal of the electronically
controlled volume unit 5 and outputs it to the speaker 7. The speaker 7 generates an output
audio signal of the power amplifier unit 6.
[0017]
Next, the operation of the embodiment of the present invention will be described with reference
to a flowchart. FIG. 2 shows a flowchart for explaining the operation of the first embodiment of
the present invention, which is executed by the control unit 1.
[0018]
First, as shown in FIG. 2, the control unit 1 monitors whether or not the power switch of the
vehicle is pressed (step 101), and when it is determined that the power switch is not pressed, the
circuit It is checked whether the power is on or not in operation (step 102).
[0019]
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Thus, if it is not in operation, it is monitored again whether or not the power switch is pressed,
and when it is in operation, the volume level by the volume operation of any of CD changer 2 or
radio / television portion / cassette deck portion 3 It is determined whether or not there is a
change in (step 103).
When it is determined that there is a change in the volume level, the volume level after the
change is written to the first memory, that is, the volume level setting memory (step 104).
[0020]
On the other hand, when it is determined in step 101 that the power switch is pressed, it is
checked whether the circuit power is on (in operation) at present (step 105). A power off process
is performed (step 106). If it is determined in step 105 that the system is not in operation, power
on processing is performed to turn on the circuit power (step 107). The processes of the above
steps 101 to 107 are the same as the processes of the conventional steps 401 to 407.
[0021]
After the power on process is performed in the above step 107, the volume level before power
off which is the volume level in operation just before the power off written in the volume level
setting memory in the above step 104 is from the volume level setting memory It is read out
(step 108).
[0022]
Next, in this embodiment, the pre-power-off volume level is compared with a preset constant
value (step 109). If the pre-power-off volume level is less than or equal to a predetermined value,
the control unit 1 reads The electronically controlled volume unit 5 is controlled to set the prepower-off volume level as it is as the volume level (step 110).
On the other hand, when it is determined in step 109 that the pre-power-off volume level is
greater than a predetermined value, the control unit 1 controls the electronically controlled
volume unit 5 with the preset fixed volume level as the volume level (step 111). ).
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[0023]
Therefore, according to the present embodiment, when the volume level before the power-off is
quite large and is larger than the above-mentioned fixed value, the volume level at the time of the
power-on is forcibly set to the above-mentioned fixed volume level. It will be. Therefore, when the
power is turned on, a large volume is not output carelessly, and it is possible to prevent the
passenger from feeling uncomfortable, and the above-mentioned fixed volume level is a volume
that is not too low. Because of the level, the volume is lowered more than necessary, and the
inconvenience of having to increase the volume level again can be prevented.
[0024]
Next, a second embodiment of the present invention will be described with reference to the
flowchart of FIG. In FIG. 3, the same processing steps as in FIG. 2 are denoted by the same
reference numerals, and the description thereof will be omitted.
[0025]
In FIG. 3, the control unit 1 monitors whether or not the power-on volume level setting operation
has been performed when the power switch is in operation with the power switch not pressed
down, that is, during the operation where the circuit power is turned on. (Steps 101, 102, 201).
[0026]
The power-on volume level is a threshold level to be compared with the pre-power-off volume
level at power-on, as described later.
As the setting operation, for example, the power on / off is repeated 5 times or more within 1
second, the arbitrary single operation button is continuously pressed for 5 seconds or more, the
arbitrary plural operation buttons are simultaneously pressed, the arbitrary single operation
button It is conceivable to press five times or more within one second.
[0027]
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When the power-on volume level operation is performed, the power-on volume level is written to
the second memory (step 202). When it is determined that the power on volume level operation
is not performed, the control unit 1 monitors whether or not the volume level has been changed
(step 103). Thus, during operation, the stored volume level is rewritten each time the volume
level is changed in the first memory (volume level setting memory), and the power is turned on
when the power on volume level is operated. When the volume level is written to the second
memory.
[0028]
On the other hand, when the power switch is not operated when the power switch is pressed, the
circuit power is turned on, and the power-off volume previous level is read from the volume level
setting memory, and then the power-off pre-power-off volume level and the second memory are
read. The magnitude comparison with the power on volume level is compared (steps 101, 105,
107, 108, 203).
[0029]
When the pre-power-off volume level is lower than the power-on volume level, the control unit 1
controls the electronically controlled volume unit 5 so that the pre-power-off volume level
becomes the volume level at the current power-on ( Step 204) On the other hand, when it is
determined that the pre-power-off volume level is greater than the power-on volume level, the
predetermined fixed volume level is set to the electronic volume level at the current power-on.
The controlled volume unit 5 is controlled (step 205).
[0030]
As described above, according to the present embodiment, since the power-on volume level to be
compared with the volume level before power-off can be arbitrarily changed during the operation
before the current power-on, the power-on can be performed. It is possible to improve the
freedom of setting of the volume level at the time.
[0031]
As described above, according to the first aspect of the present invention, when the volume level
before power-off is higher than a predetermined value, the volume level at power-on is forced to
a fixed volume level. By setting it, it is possible to prevent the passenger from giving a feeling of
discomfort because it is prevented that a loud volume is inadvertently output when the power is
turned on, and there is no hindrance to driving safety, and Since the above-mentioned fixed
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volume level is a volume level that is not too low, it is possible to prevent the inconvenience of
lowering the volume more than necessary and having to increase the volume level again.
[0032]
Further, according to the invention of claim 2, by changing the setting of the volume level at the
time of power on which is compared with the volume level before the power off by any setting
change, the degree of freedom of the volume level at the time of power on is compared The
improved sound volume control can be performed according to the driver's preference.
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