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JP2016124470

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2016124470
Abstract: To provide a sound effect ringer capable of transmitting information of a direction. In a
sound effect ringer 1, a control unit 10 transmits one information to be transmitted to a vehicle
occupant by sound effects from a plurality of speakers SP and controls frequency signals to a
plurality of speakers SP. By outputting the sound effects from at least one speaker SP of the
plurality of speakers SP while changing the sound pressure, one information is directed to one of
the plurality of speakers SP. Information with directionality. [Selected figure] Figure 1
Sound effect ringer
[0001]
BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a
sound effect sound producing device mounted on a vehicle and providing information having
directionality to a vehicle crew by sound effects.
[0002]
Heretofore, there have been proposed sound effect sound producing devices that provide
information to vehicle crews by sound effects.
Among such devices, there are devices that output an alarm sound by a buzzer and devices that
output an alarm sound by a speaker (see, for example, Patent Documents 1 and 2).
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[0003]
JP 2007-72631 A JP JP 2010-80995 A
[0004]
However, since the conventional sound effect sound producing apparatus is configured to only
output an alarm sound, it has been impossible to transmit information on a direction such as an
alarm direction.
[0005]
In addition, this problem is not limited to the case of outputting an alarm sound (for example, an
approaching sound door opening sound indicating the approach of another vehicle or the like,
and a non-seating sound of a seat belt), etc. This problem is common to the output of all sound
effects including alarm sounds, such as sounds giving a sense of exhilaration and comfort to
vehicle crew members, and sounds for guiding / supporting the behavior of vehicle crew
members.
[0006]
The present invention solves such a problem, and an object of the present invention is to provide
a sound effect ringer capable of transmitting direction information.
[0007]
The sound effect sound emitting apparatus according to the present invention is a sound effect
sound emitting apparatus mounted on a vehicle and providing information having directionality
to the crew of the vehicle by means of sound effects, and a plurality of sound effect output
sources are provided. A speaker; and control means for generating a frequency signal for
outputting sound effects from each of the plurality of speakers, wherein the control means is an
effect from the plurality of speakers of one information to be transmitted to a vehicle occupant.
While transmitting by sound, controlling the frequency signal to the plurality of speakers and
outputting the sound effect from at least one of the plurality of speakers while changing the
sound pressure, the one information is It is characterized in that the information has a
directionality to cause one of the plurality of speakers to direct awareness.
[0008]
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According to the sound effect blowing device according to the present invention, the frequency
signals to the plurality of speakers are controlled to output the sound effects from at least one of
the plurality of speakers while changing the sound pressure.
By changing the sound pressure in this manner, it is possible to direct the awareness of the
vehicle crew to any one speaker, and it is possible to transmit direction information.
[0009]
In the sound effect blowing device according to the present invention, the control means outputs
a frequency signal with constant sound pressure to the other speakers except the at least one
speaker among the plurality of speakers, and this output Preferably, during the period, the at
least one speaker outputs a frequency signal whose sound pressure gradually decreases or
increases.
[0010]
According to this sound effect blowing device, the frequency signal whose sound pressure is
constant is output to the other speakers, and the frequency signal whose sound pressure
gradually decreases or increases with respect to the at least one speaker during this output
period. Output
As described above, when the sound pressure of the sound effects from the other speakers is
made constant and the sound pressure of the sound effects from at least one speaker is gradually
changed, the vehicle occupant turns to the speaker on the sound pressure changing side And can
transmit direction information.
[0011]
Further, in the sound effect blowing device according to the present invention, prior to
transmitting the one information to the vehicle crew by the sound effects from the plurality of
speakers, the frequency signal is output to the plurality of speakers at the same timing.
Preferably, the basic sound is output from the plurality of speakers.
[0012]
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According to this sound effect blowing device, prior to transmitting one piece of information to
the vehicle crew, frequency signals are output to the plurality of speakers at the same timing, and
the basic sound is output from the plurality of speakers.
As a result, prior to the transmission of one piece of information, the basic sound can be output
from the plurality of speakers, and the awareness of the vehicle crew can be directed to voice.
This makes it possible to reduce the possibility of missing in conveying direction information.
[0013]
Further, in the sound effect blowing device according to the present invention, the plurality of
speakers are two, and are arranged in a meter unit on which a vehicle instrument is mounted,
and alert the vehicle crew by a warning sound. It is preferable to provide information.
[0014]
According to this sound effect ringer, the plurality of speakers are two, and are arranged in the
meter unit on which the vehicle meter is mounted, and provide information for prompting the
vehicle crew by a warning sound. Therefore, it is possible to output an alarm sound having
direction information from the front of the vehicle driver who wants to most quickly and
accurately transmit the alarm sound.
[0015]
In the sound effect blowing device according to the present invention, a first terminal group
consisting of a plurality of terminals capable of outputting different frequency signals, and a first
adding circuit for adding the frequency signals from the first terminal group, A second terminal
group comprising a plurality of terminals capable of outputting the different frequency signals,
and a second adding circuit for adding the frequency signals from the second terminal group,
and one of the outputs from the first adding circuit The output from the second addition circuit is
input to the other speaker.
[0016]
According to this sound effect sound producing apparatus, frequency signals can be
superimposed by each addition circuit, and variations of sound can be increased.
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[0017]
According to the sound effect ringer of the present invention, it is possible to transmit direction
information.
[0018]
It is a circuit diagram showing an outline of a sound effect sound producing device concerning a
1st embodiment of the present invention.
It is a front view of a meter unit.
In the sound effect blowing device according to the first embodiment, it is a waveform diagram of
the signal output to the plurality of speakers, (a) shows the waveform of the signal to the first
speaker, (b) is a waveform to the second speaker It shows the waveform of the signal.
It is a table | surface which shows the duty ratio of the frequency signal with respect to a 2nd
speaker.
The effect sound blowing apparatus concerning 2nd Embodiment WHEREIN: It is a wave form
diagram of the signal output to a several speaker, (a) shows the waveform of the signal to a 1st
speaker, (b) shows to a 2nd speaker It shows the waveform of the signal.
The effect sound blowing apparatus based on 3rd Embodiment WHEREIN: It is a wave form
diagram of the signal output to several speakers, (a) shows the waveform of the signal to a 1st
speaker, (b) shows to a 2nd speaker It shows the waveform of the signal.
[0019]
Hereinafter, the present invention will be described according to preferred embodiments, but the
present invention is not limited to the embodiments shown below, and can be appropriately
modified without departing from the scope of the present invention.
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[0020]
FIG. 1 is a circuit diagram showing an outline of a sound effect sound producing apparatus
according to a first embodiment of the present invention.
The sound effect ringer 1 shown in FIG. 1 is mounted on a vehicle and provides information to a
vehicle crew member by an alarm sound (one of sound effects).
Here, the information to be provided includes an approaching sound indicating the approach of
another vehicle or the like, a door opening sound, and a non-seating sound of a seat belt.
Furthermore, the sound effect sound producing device 1 according to the first embodiment
provides information having directionality by an alarm sound.
For this reason, the sound effect ringer 1 according to the first embodiment includes, for
example, information including the approaching direction of another vehicle, the existing
direction of the open door, and the direction of the seat on which the seat belt is not attached. I
will provide a.
[0021]
In addition, the sound effect ringer 1 is not limited to the case of providing information having
directionality by an alarm sound, a vehicle operation sound such as a turn sound for the vehicle
crew, and a refreshing feeling for the vehicle crew in the vehicle. Other sound effects may be
used to provide directional information, such as a sound for giving a sense of comfort and a
sound for guiding / supporting the behavior of a vehicle crew. In the following description, it is
assumed that the sound effect sound producing device 1 provides directional information by an
alarm sound.
[0022]
The sound effect blowing device 1 according to the first embodiment includes a plurality of
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speakers SP, a control unit (control means) 10, a plurality of addition circuits 20, and a plurality
of amplifiers 30. The plurality of (two) speakers SP1 and SP2 are output sources of alarm sound.
[0023]
FIG. 2 is a front view of the meter unit. The meter unit M shown in FIG. 2 is provided in front of
the driver's seat, and the unit M is equipped with a vehicle meter such as a speedometer, a
tachometer, a fuel gauge, and a water thermometer, and a direction indicator, And a liquid crystal
display unit and the like. In the meter unit M, a first speaker SP1 and a second speaker SP2 are
provided on the back side. The speakers SP1 and SP2 are provided on the respective end
portions of the meter unit M, which is horizontally long, so as to be spaced apart to the left and
right with respect to the vehicle traveling direction.
[0024]
Refer back to FIG. The control unit 10 generates a frequency signal for outputting an alarm
sound from each of the first and second speakers SP1 and SP2, and is constituted by, for
example, a microcomputer. The control unit 10 also has first to fourth sound generator terminals
SG1 to SG4 (hereinafter referred to as first to fourth terminals SG1 to SG4), and outputs the
above signals from these terminals SG1 to SG4. Do.
[0025]
A plurality of (two) addition circuits 20 add the signals from the first to fourth terminals SG1 to
SG4, and the first addition circuit 21 transmits the signals from the first and second terminals
SG1 and SG2. The second addition circuit 22 adds the signals from the third and fourth terminals
SG3 and SG4. The adder circuits 21 and 22 are formed of, for example, analog adder circuits
using general resistors. The first and second terminals SG1 and SG2 form a first terminal group,
and the third and fourth terminals SG3 and SG4 form a second terminal group.
[0026]
The plurality of (two) amplifiers 30 amplify the signals from the plurality of addition circuits 20
and output the amplified signals to the plurality of speakers SP. The first amplifier 31 amplifies
the signals from the first addition circuit 21. In addition, the signal is output to the first speaker
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SP1, and the second amplifier 32 amplifies the signal from the second adding circuit 22 and
outputs the amplified signal to the second speaker SP2.
[0027]
Further, in the sound effect generating device 1 according to the first embodiment, the control
unit 10 transmits one piece of information (for example, one of the approach of another vehicle,
the opening of the door, the non-seat belt, etc.) transmitted to the vehicle crew. , Information with
directionality.
At this time, the control unit 10 executes the following control.
[0028]
That is, the control unit 10 transmits one piece of information to be transmitted to the vehicle
crew by the alarm sound from the plurality of speakers SP, controls the frequency signal to the
plurality of speakers SP, and transmits at least one of the plurality of speakers SP. The alarm
sound from the speaker SP is output while changing the sound pressure. As a result, the abovedescribed one piece of information is made to be information having a directionality to direct the
consciousness to any one of the plurality of speakers SP. The details will be described below.
[0029]
FIG. 3 is a waveform diagram of signals output to a plurality of speakers SP in the sound effect
generating device 1 according to the first embodiment, wherein (a) shows the waveform of a
signal to the first speaker SP1 (b ) Shows the waveform of the signal to the second speaker SP2.
[0030]
First, as shown in FIG. 3A, the signal output to the first speaker (one speaker) SP1 is a signal of
300 ms as a whole, and among these, time 0 to time 100 ms and time 200 ms to 300 ms Is a
frequency signal that alternately repeats the H level and the L level, and the time 100 ms to 200
ms is a signal at the L level.
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The frequency of this frequency signal is 1600 Hz.
[0031]
On the other hand, as shown in FIG. 3B, the signal output to the second speaker (the other
speaker) SP2 is a frequency signal of 300 ms as a whole. This frequency signal alternately
repeats the H level and the L level. The frequency of the frequency signal is 1600 Hz as in the
case of the frequency signal to the first speaker SP1.
[0032]
Here, in the first embodiment, the alarm sound from the second speaker SP2 is output while the
sound pressure changes. More specifically, the frequency signal output to the first speaker SP1
has a constant duty ratio of, for example, 50%, and the frequency signal output to the second
speaker SP2 becomes a signal whose duty ratio gradually decreases. There is.
[0033]
FIG. 4 is a table showing the duty ratio of the frequency signal to the second speaker SP2. As
shown in FIG. 4, of the frequency signals of 300 ms in total, the duty ratio is 50% in the time
zone of 0 ms to 30 ms, 45% in the time zone of 30 ms to 60 ms, and the time zone of 60 ms to
90 ms. Is 40%. Thereafter, the duty ratio decreases by 5% every 30 ms, and becomes 5% in the
time zone of 270 ms to 300 ms.
[0034]
As described above, in the first embodiment, the control unit 10 outputs the frequency signal in
which the duty ratio gradually decreases to the second speaker SP2 during the output period of
the frequency signal in which the sound pressure to the first speaker SP1 is constant. It will be
done. As a result, the vehicle crew member turns to the second speaker SP2 and information on
the direction is transmitted.
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[0035]
Although the duty ratio is decreased in the above, the duty ratio may be increased. Also in this
case, the consciousness is directed to the second speaker SP2, and the information of the
direction is transmitted.
[0036]
Furthermore, in order to change the sound pressure, it is possible to change not only the duty
ratio but also the on-duty (see FIG. 6 described later for illustration of on-duty) at the time of
turning on the frequency signal. . In the following description, the duty ratio or the on-duty is
referred to as a sound pressure control ratio.
[0037]
Here, as apparent from the example shown in FIG. 3, in the second embodiment, two frequency
signals of 100 ms each are outputted to the first speaker SP1, and a frequency signal of 300 ms
is outputted to the second speaker SP2. It has been output. Therefore, the output timing of the
frequency signal is different between the two speakers SP1 and SP2, and the sound output time
zone in which the alarm sound is output is also different. However, the present invention is not
limited to this, and one frequency signal of 300 ms may be output to the first speaker SP1 to
make the sound output time zone coincide.
[0038]
In addition, when the sound output time zone is made different, one frequency signal of 200 ms
may be output to the first speaker SP1, or one frequency signal of 400 ms may be output to the
second speaker SP2. It may be output, and the method is various.
[0039]
Furthermore, although the frequency signals output to both speakers SP in the above are the
same frequency at 1600 Hz, the present invention is not limited to this, and different frequencies
may be used.
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[0040]
Thus, according to the sound effect blowing device 1 of the first embodiment, the sound pressure
from at least one speaker SP of the plurality of speakers SP is controlled by controlling the
frequency signal to the plurality of speakers SP. Output while changing the.
By changing the sound pressure in this manner, it is possible to direct the awareness of the
vehicle crew to any one speaker, and it is possible to transmit direction information.
[0041]
Further, a frequency signal whose sound pressure is constant is output to the other speakers SP,
and a frequency signal whose sound pressure gradually decreases or increases is output to at
least one speaker SP during this output period.
As described above, when the sound pressure of the sound effect from the other speakers SP is
constant and the sound pressure of the sound effect from at least one speaker SP is gradually
changed, the vehicle crew member changes the sound pressure to the speaker SP Consciousness
will turn and information on direction can be transmitted.
[0042]
In addition, since the plurality of speakers SP is two and arranged in the meter unit M on which
the meter for the vehicle is mounted, the alarm sound is the most important since it provides the
information for alerting the vehicle crew by the alarm sound. It is possible to output an alarm
sound having direction information from the front of the vehicle driver who wants to be notified
promptly and accurately.
[0043]
Next, a second embodiment of the present invention will be described.
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The sound effect ringer 1 according to the second embodiment is similar to that of the first
embodiment, but part of the operation is different from that of the first embodiment. Hereinafter,
differences from the first embodiment will be described.
[0044]
In the second embodiment, the control unit 10 outputs a plurality of frequency signals to the
plurality of speakers SP at the same timing before transmitting one information having directivity
by the alarm sound from the plurality of speakers SP. The basic sound is output from the speaker
SP.
[0045]
FIG. 5 is a waveform diagram of signals output to a plurality of speakers SP in the sound effect
generating device 1 according to the second embodiment, and (a) shows the waveform of a signal
to the first speaker SP1 (b ) Shows the waveform of the signal to the second speaker SP2.
[0046]
First, as shown in FIGS. 5 (a) and 5 (b), the signal after time 700 ms is the same as that shown in
the first embodiment.
The signals after time 700 ms are information having directivity, and the sound effect generating
device 1 according to the second embodiment is divided into a plurality of signals having one
cycle of 700 ms before transmitting such information. The basic sound is output from the
speaker SP.
[0047]
The first half of the 700 ms cycle signal is a frequency signal that alternately repeats H level and
L level, and the second half is L level signal.
As described above, the frequency signal is a signal for outputting a basic sound, and is output to
both the first and second speakers SP1 and SP2 at the same timing. Also, the duty ratio of the
frequency signal is, for example, 50%.
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[0048]
As described above, in the second embodiment, the control unit 10 first outputs the basic sound
from both of the two speakers SP. Thereafter, the control unit 10 outputs the same frequency
signal as that of the first embodiment. As a result, the vehicle crew first perceives that the alarm
is issued by the basic sound, and then recognizes the directional information by the alarm sound.
This makes it possible to reduce the possibility of missing in conveying direction information.
[0049]
In the above, the basic sounds output from the two speakers SP1 and SP2 may have different
sound pressures, and the frequency signals for outputting the basic sounds may have different
frequencies.
[0050]
Thus, according to the sound effect ringer 1 of the second embodiment, the information of the
direction can be transmitted as in the first embodiment.
Further, it is possible to output an alarm sound having direction information from the front of the
vehicle driver who wants to most quickly and accurately transmit the alarm sound.
[0051]
Furthermore, according to the second embodiment, prior to transmitting one piece of information
to the vehicle crew, frequency signals are output to the plurality of speakers SP at the same
timing, and the basic sound is output from the plurality of speakers SP. . As a result, prior to the
transmission of one piece of information, the basic sound can be output from the plurality of
speakers SP, and the awareness of the vehicle crew can be directed to voice. This makes it
possible to reduce the possibility of missing in conveying direction information.
[0052]
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Next, a third embodiment of the present invention will be described. The sound effect ringer 1
according to the third embodiment is similar to that of the first embodiment, but part of the
operation is different from that of the first embodiment. Hereinafter, differences from the first
embodiment will be described.
[0053]
In the third embodiment, the control unit 10 controls the frequency signals to the two speakers
SP and outputs the alarm sounds from the two speakers SP while changing the sound pressure.
Describing in detail, the control unit 10 sets the output timing (sound output time zone) of the
frequency signal to the two speakers SP1 and SP2 and the frequency f of the frequency signal to
the same, and sends the first speaker (one speaker) SP1 The on-duty of the frequency signal is
continuously decreased from a first predetermined value (for example, 100%) to a second
predetermined value (for example, 50%) smaller than the first predetermined value, and the
second speaker (the other speaker) The on-duty of the frequency signal to SP2 is continuously
increased from the second predetermined value toward the first predetermined value. By this, it
is possible to make the sound moveable by the Haas effect, and to transmit information of the
direction.
[0054]
FIG. 6 is a waveform diagram of signals output to a plurality of speakers SP in the sound effect
generating device 1 according to the third embodiment, and (a) shows a waveform of a signal to
the first speaker SP1 (b ) Shows the waveform of the signal to the second speaker SP2.
[0055]
As shown in FIGS. 6A and 6B, the signals output to the first speaker SP1 and the second speaker
SP2 form one cycle at 700 ms.
The first half of the 700 ms cycle signal is a frequency signal of 800 Hz (frequency f) alternately
repeating H level and L level, and the second half is L level signal. Also, the duty ratio of the
frequency signal of 800 Hz is 50%.
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[0056]
Here, as shown in FIG. 6A, of the 800 Hz frequency signal output to the first speaker SP1, the
first frequency signal P (1) is turned on as shown by the enlarged waveform. The on-duty, which
is the duty ratio at time, is 100%. On the other hand, the final frequency signal P (n1) of the
frequency signal of 800 Hz has an on-duty of 50% (n1 is an integer of 2 or more) as shown in the
enlarged waveform. In addition, with respect to the frequency signal of 800 Hz existing between
them, the on-duty gradually decreases in the range of less than 100% and more than 50%. That
is, assuming that the on-duty of the i-th (i is an integer of 2 or more) th frequency signal is P (i)
on, then P (i-x-1) on> P (i-x) on> P (i-) x + 1) is on. Here, x is any positive integer that satisfies
(i−x) i2.
[0057]
Thus, the control unit 10 sets the on-duty from the first predetermined value (for example,
100%) to the second predetermined value (for example, 50%) for the frequency signal of 800 Hz
output to the first speaker SP1. Decrease gradually. The on-duty frequency of each pulse P at an
on-duty of less than 100% is 62.5 kHz, which is a frequency within a range that can be perceived
by the human ear.
[0058]
Further, as shown in FIG. 6B, the frequency signal of 800 Hz (frequency f) output to the second
speaker SP2 is the first frequency signal P (1) as shown in the enlarged waveform. The on-duty is
50%, and the last frequency signal P (n1) has an on-duty of 100%. In addition, with respect to the
frequency signal of 800 Hz existing between them, the on-duty gradually increases in the range
of more than 50% and less than 100%. That is, the on-duty P (i) on of the i-th frequency signal is
P (i−x−1) on <P (i−x) on <P (i−x + 1) on.
[0059]
As described above, the control unit 10 sets the on-duty from the second predetermined value
(for example, 50%) to the first predetermined value (for example, 100%) for the frequency signal
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of 800 Hz that is output to the second speaker SP2. Gradually increase. Note that, also for this
signal, the frequency at the time of on of each pulse P at the on duty of less than 100% is 62.5
kHz, and is a frequency within the range that can be perceived by the human ear.
[0060]
Thus, the vehicle crew perceives the sound as follows. That is, the vehicle crew perceives the
sound on the first speaker SP1 side at the initial stage of the output of the alarm sound.
Furthermore, the vehicle crew feels that the perceived point of the sound moves to the second
speaker SP2 side from the initial stage of the output of the alarm sound. When perceiving in this
way, the output timing (sound output time zone) of the frequency signal to the two speakers SP1
and SP2 and the frequency of the frequency signal (800 Hz in the example shown in FIG. 6) are
identical (coincidence means human ear It is necessary to make a concept that includes minor
differences that are not recognized.
[0061]
Furthermore, in the above embodiment, the on-duty of the frequency signal to the first speaker
SP1 is continuously decreased from the first predetermined value toward the second
predetermined value, and the on-duty of the frequency signal to the second speaker SP2 is It was
made to increase continuously toward the 1st predetermined value from the 2nd predetermined
value. However, the duty ratio, which is the other sound pressure control ratio, may be set as
described above, not limited to the on-duty. That is, the control unit 10 continuously decreases
the duty ratio of the frequency signal to the first speaker SP1 from the first predetermined value
to the second predetermined value, and the duty ratio of the frequency signal to the second
speaker SP2 The value may be continuously increased from the second predetermined value
toward the first predetermined value. It is because the same effect is acquired also by this.
[0062]
Thus, according to the sound effect ringer 1 of the third embodiment, it is possible to transmit
direction information as in the first embodiment. Further, it is possible to output an alarm sound
having direction information from the front of the vehicle driver who wants to most quickly and
accurately transmit the alarm sound.
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[0063]
Furthermore, according to the third embodiment, the output timing of the frequency signal to the
two speakers SP1 and SP2 and the frequency of the frequency signal are the same, and the sound
pressure control ratio of the frequency signal to the first speaker SP1 is from the first
predetermined value The sound pressure control ratio of the frequency signal to the second
speaker SP2 is gradually increased from the second predetermined value toward the first
predetermined value while being gradually decreased toward the second predetermined value. As
a result, the vehicle occupant can perceive a sound on the first speaker SP1 side at the initial
stage of the output of the alarm sound, and then feel that the perceived point of the sound moves
to the second speaker SP2 side. Therefore, the sound can be given mobility, and information in
the direction can be transmitted.
[0064]
As mentioned above, although this invention was demonstrated based on embodiment, this
invention is not limited to the said embodiment, A change may be added in the range which does
not deviate from the meaning of this invention, Each implementation in the possible range You
may combine the technique as described in a form. For example, by combining the techniques of
the second embodiment and the third embodiment, a signal for outputting a basic sound may be
output to each speaker SP prior to the signal shown in FIG.
[0065]
Further, although two speakers SP are provided in the above embodiment, three or more
speakers SP may be provided. In addition, although each of the adder circuits 21 and 22 adds the
signals from the two terminals SG, the signals from three or more terminals SG may be added.
[0066]
In the above, the frequency signal is output from one of the first terminal SG1 and the second
terminal SG2 (first terminal group), and the frequency signal from one of the third terminal SG3
and the fourth terminal SG4 (second terminal group) However, the present invention is not
03-05-2019
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limited thereto, and the same frequency signal may be output from both sides and the first and
second addition circuits 21 and 22 may perform waveform superposition, or both The different
frequency signals may be output and the waveforms may be superimposed by the first and
second addition circuits 21 and 22. In particular, in the case of outputting different frequency
signals from both, the waveforms can be superimposed to increase the variation of sound.
[0067]
Further, although the two speakers SP1 and SP2 are provided on the back side of the meter unit
M in the above embodiment, they may be on the front side. Moreover, you may arrange |
position in the enclosure (housing for speakers) attached to the outer case of the meter unit M.
FIG.
[0068]
1: sound effect ringer 10: control unit 20: addition circuit 30: amplifier M: meter unit SG1 to SG4:
sound generator terminal SP: multiple speakers SP1: first speaker (one speaker) SP2: second
speaker The other speaker)
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