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JP2003009280

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2003009280
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
on-vehicle audiovisual apparatus, and more particularly to an audiovisual apparatus that
synchronizes left, right, front and back signal reproduction with vision and matches movement of
a sound image with an image.
[0002]
2. Description of the Related Art As a technology for providing a more comfortable vehicle
interior space, an audiovisual apparatus for projecting and reproducing an image (movie, concert,
etc.) on a screen provided on the window glass surface of a vehicle or in the vicinity thereof. Is
considered. The technology of the audiovisual apparatus has been improved year by year, and
since an image can be projected largely, the audiovisual apparatus which performs image
projection toward the rear glass surface (screen) of the vehicle and provides a powerful image
has appeared.
[0003]
[0003] However, in the conventional audiovisual apparatus as shown in FIG. 1, the viewer looks
backwards usually unlike the usual when projecting an image to the rear of the vehicle and
reproducing an audio. The audio signal (left / right / front / back signal) is reversed with respect
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to the viewing position to see and hear the sound. That is, the right rear reproduction sound RR is
reproduced from the speaker RRS on the left front of the viewer, the left rear reproduction sound
RL is reproduced from the speaker RLS on the right front, and the right front reproduction from
the speaker FRS on the left The sound FR is reproduced, and the speaker FLS behind the right
reproduces the reproduction sound FL for the left rear. Therefore, there is a problem that the
feeling of movement of the sound image is different from that of the image.
[0004]
The present invention is to solve the above-mentioned problems, and to realize an audiovisual
apparatus which synchronizes the reproduction of an audio signal with vision and provides a
realistic sound field by integrating the sense of movement of the sound image and the image. It
will be an issue.
[0005]
SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is
directed to a left channel speaker for outputting a left channel signal, and a right channel in an
audiovisual apparatus in which a video display device is disposed at the rear. A right channel
speaker for outputting a signal, and left / right switching control means for supplying a left
channel signal to the right channel speaker in response to an instruction signal from the
switching signal output means and supplying a right channel signal to the left channel speaker It
is characterized by
[0006]
In an audiovisual apparatus in which an image display apparatus is disposed at the rear, a front
channel speaker for outputting a front channel signal, a rear channel speaker for outputting a
rear channel signal, and an instruction signal from a switching signal output means. And a left /
right switching control means for supplying the front channel signal to the rear channel speaker
and supplying the rear channel signal to the front channel speaker.
[0007]
Also, in an audiovisual apparatus in which an image display apparatus is disposed at the rear, a
left front channel speaker for outputting a left front channel signal, a right front channel speaker
for outputting a right front channel signal, and a left rear for outputting a left rear channel signal.
The left front channel signal is supplied to the right rear channel speaker in response to an
instruction signal from the channel speaker, the right rear channel speaker outputting the right
rear channel signal, and the switching signal output means, and the right front channel signal to
the left rear channel speaker And four-way switching control means for supplying the left rear
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channel signal to the right front channel speaker and supplying the right rear channel signal to
the left front channel speaker.
[0008]
Further, in the audiovisual apparatus in which the video display device is disposed at the rear, the
left front channel speaker for outputting the left front channel signal, the right front channel
speaker for outputting the right front channel signal, and the left rear for outputting the left rear
channel signal. The left front channel signal is supplied to the right rear channel speaker in
response to an instruction signal from the switching signal output means, the channel speaker,
the right rear channel speaker outputting the right rear channel signal, the woofer speaker
outputting the bass signal, The front right channel signal is supplied to the left rear channel
speaker, the left rear channel signal is supplied to the right front channel speaker, the right rear
channel signal is supplied to the left front channel speaker, and the bass signal is supplied as it is
to the woofer speaker It is characterized by having.
[0009]
Further, the switching signal output means is a rotation detecting means for detecting that the
seat has been turned to the rear, and the rotation detecting means has detected that the seat has
been turned to the rear. And a rotation signal output means for outputting a switching control
signal for switching the sound reproduction signal.
[0010]
Further, the switching signal output means switches the sound reproduction signal when it is
detected by the seating detection means that the seating detection means detects that a person is
seated in the seat and the seating detection means. And seating signal output means for
outputting a switching control signal.
[0011]
The switching signal output means may be a storage detection means for detecting that the seat
has been stored, and a switching control signal for switching the sound reproduction signal when
the storage means has detected that the seat has been stored. And storing signal output means
for outputting the signal.
[0012]
Further, the switching signal output means is an installation detection means for detecting that
the video display device is installed in the vehicle compartment, and when the installation
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detection means detects that the video display device is installed, And setting signal output
means for outputting a switching control signal for switching the sound reproduction signal.
[0013]
The switching signal output means may be an operation detecting means for detecting that the
projection apparatus has operated, and a switching control for switching the sound reproduction
signal when the operation detecting means detects that the projection apparatus has operated.
And operation signal output means for outputting a signal.
[0014]
The signal processing apparatus may further include delay signal processing means for delaying
an acoustic signal in response to an instruction signal from the switching signal output means.
[0015]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an audiovisual apparatus
according to an embodiment of the present invention will be described.
FIG. 2 is a block diagram showing the configuration of the audiovisual apparatus according to the
embodiment of the present invention.
[0016]
Reference numeral 1 denotes a video and audio source unit composed of a plurality of video and
audio source devices (possibly including a mixture of only audio devices) for outputting video
and audio signals, such as a video player, a DVD player, etc. The device having a video function is
not only an audio output but also a display device (not shown) (composed of a liquid crystal
display device etc. provided in an instrument panel of a vehicle) and a screen provided near the
rear glass window of the vehicle. It comprises an audiovisual apparatus or the like that outputs
an image signal to a projection apparatus that projects an image.
[0017]
Reference numeral 2 denotes a preamplifier for performing preamplification, sound quality /
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sound field control, and signal distribution control to each speaker, which comprises a
reproduction equalizer circuit, a tone control circuit, an output switching circuit, an attached
circuit, and the like.
The preamplifier 2 serves as an input terminal, the right channel front terminal FRI, the right
channel rear terminal RRI, the center channel front terminal FCI, the center channel rear terminal
RCI, the left channel front terminal FLI, the left Terminal RLI for channel rear, terminal FRO for
right channel front as output terminal, terminal RRO for right channel rear, terminal FCO for
center channel front, terminal RCO for center channel rear, terminal FLO for left channel front, It
has a terminal RLO for the left channel rear.
[0018]
A power amplifier 3 amplifies the power of the audio signal output from the preamplifier 2 and
outputs it as reproduced sound from each speaker.
That is, the reproduction signal output from the output terminal FRO is the right front speaker
FRS, the reproduction signal output from the output terminal RRO is the right rear speaker RRS,
and the reproduction signal output from the output terminal FCO is the center front speaker FCS,
the output terminal RCO The reproduction signal output from the center rear speaker RCS, the
reproduction signal output from the output terminal FLO is power amplified by the left front
speaker FLS, and the reproduction signal output from the output terminal RLO is output to the
left rear speaker RLS. .
[0019]
Next, the reproduction signal path of the vehicle-mounted sound reproduction apparatus
according to the first embodiment of the present invention will be described with reference to
FIG.
[0020]
Generally, when viewing a video such as in-vehicle audio, video, DVD, etc. in a forward direction,
the following is performed as in the conventional case (similar to FIG. 1).
[0021]
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The right channel front signal (FR signal) input to the input terminal FRI of the preamplifier 2 is
output to the output terminal FRO, and the signal is power-amplified by the power amplifier 3
and output from the speaker FRS.
[0022]
The right channel rear signal (RR signal) input to the input terminal RRI of the preamplifier 2 is
output to the output terminal RRO, and the signal is power-amplified by the power amplifier 3
and output from the speaker RRS.
[0023]
The center channel front signal (FC signal) input to the input terminal FCI of the preamplifier 2 is
output to the output terminal FCO, and the signal is power-amplified by the power amplifier 3
and output from the speaker FCS.
[0024]
The central channel rear signal (RC signal) input to the input terminal RCI of the preamplifier 2 is
output to the output terminal RCO, and the signal is power-amplified by the power amplifier 3
and output from the speaker RCS.
[0025]
The left channel front signal (FL signal) input to the input terminal FLI of the preamplifier 2 is
output to the output terminal FLO, and the signal is power-amplified by the power amplifier 3
and output from the speaker FLS.
[0026]
The left channel rear signal (RL signal) input to the input terminal RLI of the preamplifier 2 is
output to the output terminal RLO, and the signal is power-amplified by the power amplifier 3
and output from the speaker RLS.
[0027]
Also, when the signal distribution switching condition to the speaker described later is satisfied,
the following occurs (as shown in FIG. 2).
[0028]
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The FR signal input to the input terminal FRI of the preamplifier 2 is output to the output
terminal FLO, and the signal is power-amplified by the power amplifier 3 and output from the
speaker FLS.
[0029]
The RR signal input to the input terminal RRI of the preamplifier 2 is output to the output
terminal RLO, and the signal is power-amplified by the power amplifier 3 and output from the
speaker RLS.
[0030]
The FC signal input to the input terminal FCI of the preamplifier 2 is output to the output
terminal RCO, and the signal is power-amplified by the power amplifier 3 and output from the
speaker RCS.
[0031]
The RC signal input to the input terminal RCI of the preamplifier 2 is output to the output
terminal RCO, and the signal is power-amplified by the power amplifier 3 and output from the
speaker RCS.
[0032]
The FL signal input to the input terminal FLI of the preamplifier 2 is output to the output
terminal FRO, and the signal is power-amplified by the power amplifier 3 and output from the
speaker FRS.
[0033]
The RL signal input to the input terminal RLI of the preamplifier 2 is output to the output
terminal RRO, and the signal is power-amplified by the power amplifier 3 and output from the
speaker RRS.
[0034]
The condition for switching the signal distribution to the speaker can be selected freely from the
video signals from the plurality of video and audio sources, such as the video and audio source
signal that the passenger wants to view (for example, from the video selection operation unit
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Select a DVD as the audiovisual source, etc.), that is, the playback state of the video.
When it is detected that the seat turns to the rear, when it is detected that a person is seated in
the seat, and when it is detected that the back seat is stored, the image display device (screen
etc.) When it is detected that it has been installed, or when it is detected that the projection
device has been operated, etc., the occupant turns backward by all or any appropriate
combination of these conditions (combination of AND condition and OR condition) When it is
possible to estimate that the user is watching a video, the signal distribution switching condition
from the speaker is satisfied, and the signal distribution to the speaker is switched.
[0035]
Next, a specific configuration of the audiovisual apparatus according to an embodiment of the
present invention will be described with reference to FIG.
[0036]
Reference numeral 11 denotes detection means for detecting whether the user is viewing the
audiovisual apparatus forward or backward with respect to the vehicle.
The detection means 11 is a detection means (including a switch or the like that changes its state
according to the seat rotational position) that detects that the seat has turned to the rear, and a
detection that detects that a person is seated on the seat Means (composed of a sensor that
changes in state when a person is seated, for example, a pressure sensor), detection means that
detects that the rear seat is stored for screen installation (a switch that changes state when the
rear seat is stored) ), Detection means for detecting that the image display device (screen or
projection device) has been installed in the vehicle compartment (composed of a switch etc.
which changes its state according to the fixed state of the screen), detection that the projection
device has operated Detection means (detecting the state of the power switch of the projection
apparatus) or the like can be considered.
It should be estimated from the appropriate combination of the output states of these detection
means whether the user is viewing the audiovisual signal forward or backward with respect to
the plane.
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[0037]
Reference numeral 12 denotes a memory for storing various data such as sound quality and data
for controlling a sound field, a program of a microcomputer, etc., and temporarily storing data in
arithmetic processing, and is constituted by a ROM and a RAM. .
The memory 12 also stores data for realizing an equalizer, a delay, and a gain characteristic in
the case of viewing in a backward direction when viewing in a forward direction.
[0038]
13 is a program based on a stored program that receives an operation signal from the operation
unit 16, selects an audiovisual apparatus to be reproduced, controls the DSP according to data
read from the memory 12, and the like. It is a microcomputer that performs operations and is
composed of a CPU that performs calculations and processing, controls each component, and an
interface for connecting to an external circuit.
[0039]
A DSP 14 performs preamplification, sound quality / sound field control, and signal distribution
control to each speaker in accordance with a signal from the microcomputer 13. The DSP 14
performs reproduction arithmetic circuit, output switching circuit and tone by digital arithmetic
processing. Implement functions such as control circuit and attached circuit.
That is, the DSP 14 implements the preamplifier 2.
[0040]
A digital / analog converter 15 converts a digital signal into an analog signal.
[0041]
Reference numeral 16 denotes a video selection operation unit for performing various operations
such as selection of the video source of the video to be reproduced, volume / quality operation,
fast-forwarding / rewinding operation of video / audio, and is composed of a push button switch,
touch panel, etc. Be done.
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[0042]
Next, the operation of the audiovisual apparatus in the aspect of the first embodiment of the
present invention will be described.
[0043]
From the video signals from the plurality of video sources, the passenger freely selects the video
source signal that he / she wants to view.
For example, when the passenger selects an audiovisual source device (for example, a DVD)
through the operation unit 16 as a reproduced audiovisual source, a signal indicating that the
audiovisual source is selected is output from the operation unit 16 to the microcomputer 13 The
microcomputer 13 controls each device to reproduce the video and audio of the selected
audiovisual source.
Further, when a switching signal for projecting an image to the rear of the vehicle compartment
is outputted to the microcomputer 13 by the detection means 11, the microcomputer 13 reads
data from the memory 12 such as equalizer, delay and gain characteristics when viewing
backwards. While outputting, the switching data for distributing the audio signal of each channel
of the video and audio source 1 appropriately to each speaker as shown below are output to the
DSP 14.
The DSP 14 inputs this switching data, an FL signal to port P1 (output terminal FRO), an RL
signal to port P2 (output terminal RRO), and a silence signal (no output) to port P3 (output
terminal FCO), port The addition signal of FC signal and RC signal is output to P4 (output
terminal RCO), the FR signal is output to port P5 (output terminal FLO), and the RR signal is
output to port P6 (output terminal RLO). After being converted from digital to analog by the
converter 15, power is amplified by the power amplifier 3 and output as sound from each
speaker.
[0044]
In this embodiment, since the audio signals at the left and right of the vehicle are inverted, when
the user is viewing backwards, the audio can be viewed from the normal left and right directions.
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The sense of movement of the image is different from that of the image, etc., the reproduction of
the audio signal can be synchronized with the visual sense, and the sense of movement of the
sound image and the image can be integrated to maintain the realistic sound field. .
[0045]
Next, the reproduction signal path of the vehicle-mounted sound reproduction apparatus
according to the second embodiment of the present invention will be described with reference to
FIG.
[0046]
When the condition for switching signal distribution to the speaker is satisfied, the result is as
shown in FIG.
[0047]
The FR signal input to the input terminal FRI of the preamplifier 2 is output to the output
terminal RRO, and the signal is power-amplified by the power amplifier 3 and output from the
speaker RRS.
[0048]
The RR signal input to the input terminal RRI of the preamplifier 2 is output to the output
terminal FRO, and the signal is power-amplified by the power amplifier 3 and output from the
speaker FRS.
[0049]
The FC signal input to the input terminal FCI of the preamplifier 2 is output to the output
terminal RCE, and the signal is power-amplified by the power amplifier 3 and output from the
speaker RCS.
[0050]
The RC signal input to the input terminal RCI of the preamplifier 2 is output to the output
terminal RCO, and the signal is power-amplified by the power amplifier 3 and output from the
speaker RCS.
[0051]
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The FL signal input to the input terminal FLI of the preamplifier 2 is output to the output
terminal RLO, and the signal is power-amplified by the power amplifier 3 and output from the
speaker RLS.
[0052]
The RL signal input to the input terminal RLI of the preamplifier 2 is output to the output
terminal FLO, and the signal is power-amplified by the power amplifier 3 and output from the
speaker FLS.
[0053]
The basic operation and configuration of the audiovisual apparatus of this embodiment are the
same as those of the first embodiment, and in the DSP 14 when the condition for switching signal
distribution to the speaker is satisfied, port P1 (output terminal FRO) RR signal, FR signal to port
P2 (output terminal RRO), silence signal (no output) to port P3 (output terminal FCO), addition
signal of FC signal and RC signal to port P4 (output terminal RCO), port An RL signal is output to
P5 (output terminal FLO), and an FL signal is output to port P6 (output terminal RLO). These
signals are converted from digital to analog by D / A converter 15, and then power is output
from power amplifier 3. It is amplified and output as sound from each speaker.
[0054]
In the present embodiment, since the voice signals before and after the vehicle are inverted,
when the user is viewing backwards, the sound can be viewed from normal back and forth
directions. The sense of movement of the image is different from that of the image, etc., the
reproduction of the audio signal can be synchronized with the visual sense, and the sense of
movement of the sound image and the image can be integrated to maintain the realistic sound
field. .
[0055]
Next, the reproduction signal path of the vehicle-mounted sound reproduction apparatus
according to the third embodiment of the present invention will be described with reference to
FIG.
[0056]
When the condition for switching signal distribution to the speaker is satisfied, the result is as
shown in FIG.
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[0057]
The FR signal input to the input terminal FRI of the preamplifier 2 is output to the output
terminal RLO, and the signal is power-amplified by the power amplifier 3 and output from the
speaker RLS.
[0058]
The RR signal input to the input terminal RRI of the preamplifier 2 is output to the output
terminal FLO, and the signal is power-amplified by the power amplifier 3 and output from the
speaker FLS.
[0059]
The FC signal input to the input terminal FCI of the preamplifier 2 is output to the output
terminal RCO, and the signal is power-amplified by the power amplifier 3 and output from the
speaker RCS.
[0060]
The RC signal input to the input terminal RCI of the preamplifier 2 is output to the output
terminal RCO, and the signal is power-amplified by the power amplifier 3 and output from the
speaker RCS.
[0061]
The FL signal input to the input terminal FLI of the preamplifier 2 is output to the output
terminal RRO, and the signal is power-amplified by the power amplifier 3 and output from the
speaker RRS.
[0062]
The RL signal input to the input terminal RLI of the preamplifier 2 is output to the output
terminal FRO, and the signal is power-amplified by the power amplifier 3 and output from the
speaker FRS.
[0063]
The basic operation and configuration of the audiovisual apparatus of this embodiment are the
same as those of the first embodiment, and the port P1 (output terminal is selected in the DSP 14
when the condition for switching signal distribution to the speaker is satisfied. RRO signal to
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FRO, FL signal to port P2 (output terminal RRO), silence signal (no output) to port P3 (output
terminal FCO), addition signal of FC signal and RC signal to port P4 (output terminal RCO), port
An RR signal is output to P5 (output terminal FLO), and an FR signal is output to port P6 (output
terminal RLO). These signals are converted from digital to analog by D / A converter 15, and then
power is output from power amplifier 3. It is amplified and output as sound from each speaker.
[0064]
In the present embodiment, since the voice signals at the front, rear, left, and right of the vehicle
are inverted, the sound can be viewed from the normal front, rear, left, and right when the user is
viewing backward. The sense of movement of the front and back and right and left will not be
different from that of the video, etc., the reproduction of the audio signal will be synchronized
with the vision, and the movement of the sound image and the video will be integrated to
maintain the realistic sound field I can do things.
[0065]
As a modification of the third embodiment of the present invention, there is a case where the
woofer speaker RCS does not exist, but in this case, the FC signal is not output when the
condition for switching the signal distribution to the speaker is satisfied. The other operations are
the same as in the third embodiment.
[0066]
As described above in detail, according to the present invention, an occupant arbitrarily selects
from a plurality of audiovisual sources, looks backward, looks at an image, and listens to a sound.
At the same time, it is possible to realize an audiovisual apparatus in which the reproduction of
the audio signal is synchronized with the visual sense, and the sense of movement of the sound
image and the image are integrated to provide a realistic sound field.
[0067]
Brief description of the drawings
[0068]
1 is a block diagram showing the reproduction signal path of the conventional audiovisual
apparatus.
[0069]
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2 is a configuration diagram showing a reproduction signal path of the audiovisual apparatus
according to the first embodiment of the present invention.
[0070]
3 is a block diagram showing the reproduction signal path of the audiovisual apparatus of the
second embodiment of the present invention.
[0071]
4 is a configuration diagram showing a reproduction signal path of the audiovisual apparatus of
the fourth embodiment of the present invention.
[0072]
5 is a configuration diagram showing the configuration of the present invention
[0073]
Explanation of sign
[0074]
DESCRIPTION OF SYMBOLS 1 ...... Audiovisual source 2 ...... Preamplifier 3 ...... Power amplifier 11
... Detection means 12 ... Memory 13 ... Microcomputer 14 ... DSP15 ... Digital-analog conversion
Unit 16 ... Operation unit
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