JPH03258200

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DESCRIPTION JPH03258200
[0001]
Overview For example, in an on-vehicle sound reproducing apparatus capable of performing
realistic sound reproduction using a so-called digital signal processor or the like, the listener's
listening point is determined based on the output from the seat position detecting means of the
power seat. The sound signal is detected so that the sound image is localized at the listening
point. As a result, the sound image can be automatically localized at the optimum position
without complicated operations. FIELD OF THE INVENTION The present invention relates to an
on-vehicle sound reproducing apparatus provided with signal processing means such as a digital
signal processor. In the prior art vehicle-mounted sound reproduction apparatus, in order to
adjust the balance of the left and right and / or front and back of the sound image, in the typical
prior art, volume adjustment by the listener is required. SUMMARY OF THE INVENTION
Therefore, in the above-mentioned prior art, when the device to be volume-operated and the
listening position are apart, it is not possible to adjust the volume while listening to the
reproduced sound, ie, the listener After listening to the reproduction sound at the listening
position, it is necessary to change the posture to the place where the device is arranged to
perform volume operation and return the posture to the listening position again to confirm the
reproduction sound. Therefore, in order to localize a sound image to a desired position,
complicated operation and a long time are required, and the operability and functionality are
inferior. Further, in the case of a vehicle-mounted sound reproduction device, the sound listening
conditions of the driver, the number of passengers, etc. frequently change, so the abovedescribed volume adjustment must be performed each time the change is made. On the other
hand, with recent advances in digital signal processing technology, there has been proposed a
configuration in which an acoustic signal is subjected to digital arithmetic processing to
reproduce a realistic sound image. In such a configuration, a slight deviation of the listener's
listening point greatly affects the reproduction of the sound image. An object of the present
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invention is to provide a sound reproducing apparatus capable of localizing a sound image at a
listening point of a listener without complicated operations. Means for Solving the Problems The
present invention provides a signal processing means between an acoustic signal source and a
speaker, and processes the acoustic signal from the acoustic signal source by the signal
processing means to adjust the localization position of the sound image. Control means for
controlling the arithmetic processing of the signal processing means so that the sound image is
localized at the listening point of the listener in response to the output of the seat position
detection means of the power seat of the automobile. And a sound reproducing apparatus
characterized in that Operation According to the present invention, the sound signal from the
sound signal source is processed by the signal processing means to adjust the localization
position of the sound image, and then output to the speaker for sounding.
On the other hand, the seat position detection means of the power seat of the car outputs
information on the seat position where the listener sits down, the control means receives the seat
position information, and the control means locates the sound image at the listener's listening
point In order to do this, the arithmetic processing of the signal processing means is controlled.
Therefore, even if the listener's listening point is displaced, the sound image is automatically
localized at the displaced listening point. Embodiment 1 FIG. 1 is a block diagram showing an
electrical configuration of a vehicle-mounted sound reproducing apparatus 2 according to an
embodiment of the present invention. From the acoustic signal source 3 realized by a magnetic
tape reproducing apparatus, a radio receiver or the like, acoustic signals of both left and right
channels are outputted. This acoustic signal is separated into each acoustic signal in the front
left, right and rear left and right in the channel separation unit 4 and then converted into digital
signals by analog and digital converters ADFL and ADFR: ADRL and ADRR, respectively, and
signal processing means Is input to the digital signal processor 1. A control unit 7 and a memory
8 are provided in association with the digital signal processor 1. As described later, the digital
signal processor 1 performs arithmetic processing on each of the sound signals so that the sound
image is localized to a position corresponding to the position and posture of the seat 13, and
digital / analog converters DAFL, DAFR, DARL, Output to DARR. The acoustic signal of the front
left channel from the digital / analog converter DAFL is supplied to the speaker 5PFL via the
power amplifier AFL and is acousticized. Similarly, the acoustic signal of the front right channel
from the digital / analog converter DAFR is applied to the speaker 5 PFR via the power amplifier
APR and is acousticized. The acoustic signal of the rear left channel from the digital / analog
converter DARL is applied to the speaker 5PRL via the power amplifier ARL and is acousticized.
Similarly, the sound signal of the rear right channel from the digital / analog converter DAPjR is
supplied to the speaker 5PRH via the power amplifier A, RR and is sounded. In the passenger
compartment 10 of the car, the speaker 5PFL is disposed on the front left side, the speaker 5PPR
is disposed on the front right side, the speaker 5PRL is disposed on the rear left side, and the
speaker 5PRR is disposed on the rear right side. On the other hand, the driver's seat 12 is
attached with a seat 13 configured by a so-called power seat. In response to the input operation
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of the input operation unit 14 shown in FIG. 2, the control unit 15 can drive control the drive
unit 16 to change the position and attitude of the seat 13.
For example, when the switch 14a of the input operation unit 14 is operated, the drive unit 16
displaces and drives the longitudinal position of the seat 13 and the height of the seat. Also, the
switch 14. When b is operated, the tilt angle of the backrest 13a, that is, the reclining angle is
displaced. The control unit 15, which is a seat position detecting means, has a sensor for
detecting the position and attitude of the seat 13 and a memory for storing the seat position and
attitude, and the memory indicates the current seat position and attitude. A storage area for
storing and a storage area for storing a separately set seat position and posture are provided.
Therefore, the seat occupant operates the input operation unit 14 to move the seat so as to
facilitate driving and adjust the seat position and posture, and a seat that matches the user based
on the seat information stored in the memory in advance. There is a method of selecting the
position and attitude and automatically adjusting the seat position and attitude. In addition, the
memory can store a plurality of seat positions and postures set by the rider, store the seat
positions and postures for each driver, or according to the driving situation (highway, mountain
road, etc.) It is stored and used. Then, the control unit 15 outputs seat position detection
information to the control unit 7 through the line 11 from the storage area storing the current
seat position and posture. The control unit 7 calculates a listening point of the listener based on
the input seat position detection information, and sets a calculation constant and a calculation
coefficient in the digital signal processor so that the sound image is localized at the listening
point. The calculation constant and the calculation coefficient are obtained in advance by
experiment or the like corresponding to the position and posture of the seat 13. That is, for
example, the seat 13 is an instrument! When it is displaced to the 11 side, that is, to the front
side, the sound signal data on the front side is temporarily delayed by the memory 8 and then
output. As described above, in the sound reproducing apparatus 2 according to the present
invention, the control unit 15 of the power seat detects the position and attitude of the seat 13
and changes the operation constant and coefficient in the digital signal processor 1 according to
the detection result. Since the sound image is automatically localized at the listener's listening
point, the listener does not have to perform complicated operations to adjust the localization
position of the sound image, and the operability and functionality are remarkably improved. It
can be improved. Further, detection means for detecting the presence or absence of a passenger
may be provided in the front passenger seat 17 or the rear seat 18, and the localization position
of the sound image may be adjusted according to the detection result. Furthermore, a seat
information correction memory capable of correcting the seat information by an external
operation is provided corresponding to a memory for storing the seat position in advance in the
control unit 15 of the power seat, and a seat occupant selects the seat position information
stored in advance. In this case, the information of the corresponding seat information correction
memory may be output from the control unit 15 of the power seat, and control may be
performed according to not only the seat position but also the physical size of the seat occupant.
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As described above, according to the present invention, the position and posture of the seat on
which the listener is seated is detected from the seat position detecting means of the power seat,
and the arithmetic processing of the acoustic signal is performed based on the detection result.
Therefore, even if the listener's listening point is displaced, the sound image can be automatically
localized to the displaced listening point without complicated operation, and operability and
functionality can be improved. .
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing the electrical configuration of a sound reproducing apparatus
2 according to an embodiment of the present invention, and FIG. 2 is a perspective view of a seat
13.
■ · · · Digital signal processor, 211 playback device, 3 · · · acoustic signal source, 14 · · · input
operation unit, 7 ° 15 · · · control unit, 10 · · · room, 13, 17. 18 · · Seats, 16 · · · · Drive unit, 5PFL,
5PPR · 5PRL, 5PRR · · · Speaker
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