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JPH07131883

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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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH07131883
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
in-vehicle sound reproduction system, and more particularly to a vehicle interior sound field
correction apparatus capable of always obtaining an optimum sound even if the number of
passengers and the position of the head of a passenger changes.
[0002]
2. Description of the Related Art Conventionally, as shown in FIG. 5, as a car interior sound field
correction device, the sensors 9a to 9d of a detection device provided on each seat detect the
presence or absence of the head of each occupant, and the position of the person at that time It
has been proposed that the main speakers 12a to 12d be driven to characteristics that meet the
above requirements to obtain an optimum sound field correction effect.
[0003]
However, in the above-described conventional vehicle, although the presence or absence of each
occupant's head can be detected, the position can not be detected when the position of the head
is slightly moved or shifted to the left or right. Therefore, fine correction of the transmission
characteristics from the main speakers 12a to 12d to each passenger could not be performed.
[0004]
The present invention has been made in view of the above-described point, and an object of the
present invention is to give an optimum sound field correction effect to each occupant by
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accurately detecting the position of each occupant's head. An object of the present invention is to
provide a vehicle interior sound field correction device capable of
[0005]
According to the present invention, there is provided a vehicle interior sound field correction
apparatus comprising: speakers for sound field correction disposed near the head of a person
sitting on each seat in the vehicle interior; A head position detecting device is disposed, and
further, a sheet longitudinal position detecting device and an inclination angle detecting device
are provided, and the transmission characteristics from the main speaker to the ear are corrected
based on the head position calculated from each detecting device. The reproduction level and the
frequency characteristic of the speaker for sound field correction are controlled.
[0006]
In the in-vehicle interior sound field correction device, the head position detection device may be
a receiver or a transmitter attached to the listener's ear, and a transmitter or a receiver
corresponding to the receiver attached to the headrest or the transmitter. And a distance
detection device having
[0007]
Furthermore, in the vehicle interior sound field correction device, when the head position
deviates from the preset range, the control state immediately before that is maintained.
[0008]
According to the vehicle interior sound field correction device of the present invention, the
position of the headrest is detected from the front and back position and the inclination angle of
the seat detected from the front and rear position detection device and the inclination angle
detection device of the seat. Since the relative position of the head to the headrest is detected
from the two or more head position detection devices provided, the position of each head of the
occupant can be accurately calculated.
[0009]
Therefore, the transmission characteristics of the sound from the main speaker to the ears of
each passenger are calculated.
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In order to correct the transmission characteristics, the reproduction level and frequency
characteristics of the sound field correction speakers disposed in the vicinity of the head of each
occupant can be finely controlled according to the head movement, and the optimum sound field
correction An effect is obtained.
[0010]
FIGS. 8 and 9 show frequency characteristics indicating how the transmission characteristics of
sound from the speakers to the ears of the occupant change depending on the position of the
head.
This frequency characteristic is obtained by measurement, and the measurement position and the
arrangement of the speakers at that time are shown in FIG. 6 and FIG.
[0011]
As shown in FIG. 6A, measurement positions were measured at four height levels (each of LL, L,
C, and H) at 50 mm intervals.
The standard position corresponds to the position of the ear when a person about 170 cm tall
takes a standard posture.
The standard position is 460 mm behind the front end of the ceiling, and the height is C level.
This standard position is indicated by a black circle in the figure.
[0012]
The positions of the measurement points at the same height are shown in FIG. 6 (b).
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The positions shown in the figure are standard positions.
As shown in the figure, each measurement point indicated by a circled number is arranged in a
grid of 100 mm.
[0013]
The front speakers used for the measurement were attached at the positions shown in FIG. 6 (a)
of the left and right doors. Also, although the R rear speaker is attached to the seat rear shelf, its
position is shown in FIG. 7 (b). The L rear speaker is mounted at a symmetrical position with the
R rear speaker.
[0014]
Data of frequency characteristics at each measurement position in the front right side of the
passenger compartment is shown in FIG. The height of the measurement position is C level, and
the position on the plane is the position indicated by the circled number in FIG. 6 (b), and the
measurement position is indicated as the corresponding circled number above the data of each
frequency characteristic There is.
[0015]
Data of frequency characteristics at each measurement position at the front left of the vehicle
interior is shown in FIG. The measurement position is the same as that shown in FIG. According
to these measurement data, it can be seen that a large dip occurs around 500 Hz when the head
position moves forward.
[0016]
This can be corrected by increasing the band in the speaker provided in the headrest. If this
correction is to be performed by the main speaker, this dip is caused by the cancellation with the
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reflected wave, so even if this band is enhanced, the reflected wave is similarly strengthened and
the effect is hardly improved. Therefore, as in the present invention, it is preferable to place a
correction speaker at a position as close as possible to the ear.
[0017]
Once the head position is determined, the frequency characteristics can be predicted as shown in
the above data. That is, the transfer function at each head position can be obtained by measuring
and storing transfer functions in several transmission paths in advance and reading it. Then, the
reproduction level and the frequency characteristic of the speaker for sound field correction may
be controlled to correct it.
[0018]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle interior sound field
correction apparatus according to an embodiment of the present invention will be described
based on the drawings. FIG. 1 is a view showing the arrangement of each component in a vehicle
interior sound field correction apparatus according to an embodiment of the present invention,
and FIG. 2 is a block diagram showing a configuration of the vehicle interior sound field
correction apparatus.
[0019]
As shown in the figure, sensors 1a to 1h of the head position detecting device and sound field
correction speakers 2a to 2h are attached to the headrests 8a to 8d of the respective seats. FIG.
3A shows a connection diagram of the sensors of the head position detecting device of the two
pairs forming the pair by the receiving unit and the oscillating unit and the head position
detecting device. As shown in the figure, an ultrasonic wave signal is output from the oscillator to
the oscillation unit and the time difference detection distance calculation device, and the
ultrasonic wave signal detected by the reception unit is output to the time difference detection
distance calculation device.
[0020]
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One pair of the receiving unit and the oscillating unit are arranged side by side as shown in FIG.
3B, and the ultrasonic wave emitted from the oscillating unit and reflected by the head is
received by the receiving unit. A signal is input to the time difference detection distance
calculation device at the time of emission and reception of ultrasonic waves, so the time from
when it is emitted from the oscillation unit to when it is reflected by the head and is received by
the reception unit can be detected. The distance of can be calculated. These pairs of sensors are
installed in each headrest at a distance of about 10 cm in the lateral direction.
[0021]
FIG. 4 (a) shows a state in which the head is at the center of the headrest, and FIG. 4 (b) shows a
state in which the head is shifted to the left from the center of the headrest. When the head is in
the center of the headrest, the distance between the head and each sensor is equal. However, if
the head position deviates from the center of the headrest, the distance between the head and
each sensor is different, so head misalignment is detected .
[0022]
Further, seat angle detection devices 10a and 10b for detecting the seat angle and seat front and
back position detection devices 11a and 11b for detecting the front and back position of the seat
are provided in the front seat.
[0023]
The sheet is inclined in several steps at a constant angular interval, but there are provided a
plurality of micro switches operating at each position of the member that abuts the stopper in
each step, and this micro switch constitutes an angle detection device of the sheet. ing.
As the sheet angle detection device, a liquid may be enclosed in a container, and a change in
capacitance due to the inclination may be converted into an angle.
[0024]
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Also, the sheet moves in several steps at intervals of about 5 cm in the front-rear direction, but
micro switches are disposed at the movement intervals, and these micro switches operate
sequentially as the sheet moves. The front and rear position detecting device of the seat is
configured by these micro switches.
[0025]
A microphone 4 is disposed in front of the ceiling. The signals from the microphones and the
detection devices and the signal from the audio source 3 are input to the controller 5 as shown in
FIG.
[0026]
Signals from the microphone 4, seat angle detection devices 10a and 10b, and seat longitudinal
position detection devices 11a and 11b are directly input to the controller 5, and output signals
from the sensors 1a to 1h of the head position detection device calculate the time difference
detection distance The distances from the sensors 1a to 1h to the head position are calculated by
the devices 6a to 6h, and the distance data is input to the controller 5.
[0027]
The positions of the headrests 8a to 8d are calculated from the signals from the seat angle
detection devices 10a and 10b and the front and back position detection devices 11a and 11b,
and the positions of the headrests are calculated from the sensors 1a to 1h. The position of the
head can be calculated.
[0028]
Therefore, the controller 5 processes the signal from the audio source 3 with the optimal transfer
function (gain and phase characteristics at each frequency) so that the transmission
characteristics from the main speakers 12a to 12d can be determined and corrected, and the
power amplifier By amplifying at 7a to 7h and driving the sound field correction speakers 2a to
2h, an optimum sound field correction effect (good frequency characteristics and localization
correction) can be given to each passenger.
[0029]
Further, each frequency and phase of noise is detected by the microphone 4, and a signal for
canceling the noise is output from the controller 5, amplified by the power amplifiers 7 a to 7 h,
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and driving the sound field correction speakers 2 a to 2 h Noise control can be performed.
[0030]
The above control is performed with the positional deviation of the head within a predetermined
range.
Since it is difficult to control the correction when the head position displacement becomes large
beyond that range, the correction control is fixed with the previous correction characteristics
beyond the range, and the limit of the correction control is provided.
[0031]
The embodiment is configured as described above, but the invention is not limited thereto. For
example, the head position detection device is attached to an ultrasonic wave receiver or
transmitter attached to the listener's ear and a headrest A distance detection apparatus having a
transmission unit or a reception unit corresponding to the reception unit or the transmission unit
may be used, or a distance detection apparatus using light or laser light may be used.
[0032]
According to the vehicle interior sound field correction device of the present invention, since the
position of the head of the occupant of each seat can be accurately grasped, the correction
characteristic can be controlled in accordance with the position of the head and the head position
is different. Therefore, it is always possible to make an optimal correction.
[0033]
In addition, since the correction characteristic before the predetermined range is fixed for a large
head movement, there is no possibility that the correction circuit operates abnormally, and the
operation of the speaker is stabilized.
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