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DESCRIPTION JP2009260544

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DESCRIPTION JP2009260544
PROBLEM TO BE SOLVED: To provide a vehicle alarm drive device capable of reducing
occurrence of abnormal noise other than a desired noise and preventing a user from recognizing.
A vehicle alarm drive device comprising an amplifier circuit (2) for outputting a drive signal (C)
for driving a speaker (3) based on a plurality of control signals (A, B) from a control means (1). 1
outputs to the amplifier circuit 2 a first control signal A which sets the sound pressure of the
speaker 3 and which gradually changes at the time of rising and falling and a second control
signal B which sets the tone of the speaker 3 It will be done. [Selected figure] Figure 1
Warning drive for vehicles
[0001]
The present invention relates to an alarm drive device mounted on a vehicle, and is suitable, for
example, for a vehicle alarm drive device for driving a warning sound to notify a user who is in a
vehicle having a door closed forgetting or turning off lights. It is.
[0002]
Some conventional alarm drive devices for vehicles use a amplifier circuit or the like to blow a
speaker based on a control signal from a microcomputer (control means).
The amplifier circuit of such a speaker control device is configured to perform processing such
as amplification and synthesis on the control signal, generate a drive signal for driving the
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speaker, and output it to the speaker. For example, it is disclosed in Patent Document 1. JP-A-8188084
[0003]
However, in such an alarm drive device for a vehicle, the speaker drive signal may be distorted or
the diaphragm of the speaker may not follow the drive signal due to a sudden change in sound
pressure. The speaker operates in such a state, and the user may recognize it as an abnormal
noise, which is a problem.
[0004]
Therefore, an object of the present invention is to focus on the above-mentioned problems, and
to reduce the occurrence of abnormal noise other than the desired noise, and to prevent the user
from recognizing it. To provide.
[0005]
The alarm drive apparatus for a vehicle according to the present invention is, as stated in claim 1,
an alarm for a vehicle comprising an amplifier circuit for outputting a drive signal for driving a
speaker based on a plurality of control signals from the control means. A driving device, wherein
the control means sets a sound pressure of the speaker and a first control signal which gradually
changes at rising and falling, and a second control signal for setting a tone of the speaker. To the
amplifier circuit.
[0006]
Further, the alarm drive apparatus for a vehicle according to the present invention, as described
in claim 2, a vehicle comprising an amplifier circuit for outputting a drive signal for driving a
speaker based on a plurality of control signals from the control means. The alarm drive device,
wherein the control means outputs a first control signal consisting of a rectangular wave for
setting the sound pressure of the speaker and a second control signal for setting the timbre of
the speaker. Between the control means and the amplifier circuit, the rising and falling of the first
control signal output from the control means are shaped so as to gradually change and the sound
pressure control signal is sent to the amplifier circuit A waveform shaping circuit is provided, and
the amplifier circuit combines the sound pressure control signal and the second control signal
and outputs an amplified signal as the drive signal to the speaker. The features.
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[0007]
The present invention reduces the occurrence of abnormal noise other than the desired noise,
regarding a vehicle alarm drive device comprising an amplifier circuit for outputting a drive
signal for driving a speaker based on a plurality of control signals from the control means. It is
possible not to make the user aware.
[0008]
Hereinafter, embodiments to which the present invention is applied will be described with
reference to the attached drawings.
[0009]
What applied this invention to the alarm drive device for vehicles for making the speaker make
an alarm sound provided in a meter for vehicle installation sound is shown as an Example of this
invention.
[0010]
FIG. 1 is a block diagram showing the electrical configuration of the alarm drive device for a
vehicle.
The alarm drive device for a vehicle includes a control means 1, an amplifier circuit 2, and a
speaker 3.
[0011]
The control means 1 can be, for example, a microcomputer, is connected to a device such as a
CAN (Controller Area Network) communication cable, ignition switch, etc. by wiring (not shown),
inputs various information of the vehicle, etc. A control signal for blowing the speaker 3 is
generated and output to the amplifier circuit 2.
Further, the control means 1 includes a CPU for performing arithmetic processing based on
various information, a readable and rewritable RAM for temporarily storing arithmetic
processing results and the like in the CPU, and a ROM for storing control programs and control
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data. And an input / output interface connected by a bus to exchange various information,
control signals, clock signals, latch signals and the like.
[0012]
Further, as shown in FIG. 2, for example, as shown in FIG. 2, the control means 1 outputs a first
control signal A consisting of a voltage value for setting the sound pressure of the speaker 3 and
the sounding pattern (sounding time) and rise / fall timing. A port for outputting and a port for
outputting a second control signal B having a sound pressure of the speaker 3 and a frequency
for setting a desired tone are provided.
At this time, the control means 1 outputs the first control signal A, which is obtained by gradually
changing the rise / fall, not the abrupt rectangular change, to the amplifier circuit 2.
In this case, the control means 1 starts outputting the first and second control signals A and B to
the amplifier circuit 2 at the same timing and at the same time, ends the output, the first control
signal. The second control signal B is output for a time longer than A (in this case, 20 ms).
That is, the second control signal B is stopped later than the fall of the first control signal A.
[0013]
The amplifier circuit 2 outputs a drive signal to the speaker 3 so as to make the speaker 3 sound
at a desired sound pressure, timbre, and ringing time based on the control signals A and B from
the control means 1.
In this case, the amplifier circuit 2 combines the first control signal A and the second control
signal B, and outputs the result as a drive signal C to the speaker 3.
[0014]
The speaker 3 vibrates a vibrating member made of a diaphragm based on the drive signal C
from the amplifier circuit 2 to make a desired noise and make the user of the vehicle recognize a
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sound such as an alarm sound.
[0015]
Such a vehicle alarm drive device is a vehicle alarm drive device provided with an amplifier
circuit 2 for outputting a drive signal C for driving the speaker 3 based on a plurality of control
signals A and B from the control means 1. The control means 1 sets the sound pressure of the
speaker 3 and gradually changes the first control signal A which rises and falls at the time of
rising and falling, and the second control signal B which sets the tone of the speaker 3. It outputs
to the amplifier circuit 2.
[0016]
Therefore, since the first control signal A input to the amplifier circuit 2 gradually rises or falls,
the change in sound pressure at this time becomes a gradual drive signal C, and the drive signal
C of the speaker 3 is distorted, the speaker 3 The configuration can reduce the inability of the
diaphragm to follow the drive signal C, thereby reducing the occurrence of abnormal noise other
than the desired noise, and providing a vehicle alarm drive device capable of preventing the user
from recognizing.
[0017]
Next, the configuration of the alarm drive device for a vehicle according to another example will
be described with reference to FIGS.
[0018]
In this case, the vehicle alarm drive device includes the control means 11, the amplifier circuit
12, the speaker 13, and the waveform shaping circuit 14.
[0019]
Similar to the control means 1 described above, the control means 11 can apply a
microcomputer, for example, and generates and outputs a plurality of control signals composed
of rectangular waves for making the speaker 13 sound.
[0020]
The control means 11 has a port for outputting a first control signal A1 consisting of a voltage
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value for setting the sound pressure and the sounding pattern (sounding time) of the speaker 13
and the rising / falling timing, and the sound of the speaker 13 It has a port for outputting a
second control signal B1 consisting of a pressure and a frequency for setting a desired tone.
At this time, the control means 11 is configured to output the first control signal A1 to the
waveform shaping circuit 14 and to output the second control signal B1 to the amplifier circuit
12.
[0021]
The waveform shaping circuit 14 shapes the first control signal A1 from the control means 11
into a desired waveform shape, and for example, a circuit composed of a resistance element or a
capacitor element can be applied.
As shown in FIG. 4, the waveform shaping circuit 14 can shape a waveform that gradually
changes the rising / falling portion of the first control signal A1 which is a rectangular waveform,
and in this case, according to the capacitance of the capacitor element etc. The waveform of the
first control signal A1 is shaped and output to the amplifier circuit 12 as a sound pressure
control signal A2.
[0022]
The amplifier circuit 12 is configured to make the speaker 13 sound at a desired sound pressure,
timbre, and ringing time based on the second control signal B1 from the control means 11 and
the sound pressure control signal A2 from the waveform shaping circuit 14. The drive signal is
output to the speaker 13.
In this case, the amplifier circuit 12 synthesizes the second control signal B1 and the sound
pressure control signal A2 and outputs an amplified signal to the speaker 14 as the drive signal
C1.
[0023]
The speaker 13 vibrates a vibrating member made of a diaphragm based on the drive signal C1
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from the amplifier circuit 12 to make a desired noise and make the user of the vehicle recognize
a sound such as an alarm sound.
[0024]
Such a vehicle alarm drive device is a vehicle alarm drive device including an amplifier circuit 12
for outputting a drive signal C for driving the speaker 13 based on a plurality of control signals
A1 and B1 from the control means 11. The control means 11 outputs a first control signal A1
consisting of a rectangular wave to set the sound pressure of the speaker 13 and a second
control signal B1 to set the timbre of the speaker 13 Between the amplifier circuit 11 and the
amplifier circuit 12, the rising and falling of the first control signal A1 output from the control
means 11 are shaped so as to gradually change, and output to the amplifier circuit 2 as a sound
pressure control signal A2. The amplifier circuit 12 combines the sound pressure control signal
A2 and the second control signal B1 and outputs an amplified signal to the speaker 13 as a drive
signal C1. .
[0025]
Therefore, since the sound pressure control signal A2 input to the amplifier circuit 12 gradually
rises or falls, the change in sound pressure at this time becomes a gradual drive signal C1, and
the drive signal C1 of the speaker 13 is distorted or the speaker 13 Since the configuration can
reduce the inability of the diaphragm to follow the drive signal C1, the alarm drive device for a
vehicle can reduce the occurrence of abnormal noise other than the desired noise, and can not be
recognized by the user.
[0026]
Although the alarm drive device for a vehicle according to the present invention has been
described by way of example with the configuration of the embodiment described above, the
present invention is not limited to this, and the gist of the present invention is also applicable to
other configurations. Of course, various improvements and design changes can be made without
departing from the scope of the invention.
For example, although the first control signal gradually changes in the rising or falling portion,
the output sound of the rising or falling portion can be changed by changing the degree of
change.
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[0027]
FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.
The figure which shows an example of the output signal of embodiment same as the above.
The block diagram which shows the structure of another example of embodiment of this
invention.
The figure which shows an example of the output signal of another example same as the above.
Explanation of sign
[0028]
1 control means 2 amplifier circuit 3 speaker A first control signal B second control signal C
drive signal
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