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JPH0353699

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DESCRIPTION JPH0353699
[0001]
[Industrial field of application] The present invention provides natural sound image localization
for both listening positions, even when listening at a biased position such as the driver's seat or
the passenger's seat with respect to the left and right Sbeeker positions The present invention
relates to an on-vehicle stereo reproduction apparatus that can be obtained. [Prior Art]
Conventionally, the configuration of a typical in-vehicle stereo reproduction apparatus arranges
right and left channel speakers at the front ends of a front seat as well known, and the right
channel speaker is driven by the right channel signal The left channel speaker is configured to be
driven by the left channel signal. [Problems to be Solved] In the conventional in-vehicle stereo
playback device having such a structure, since the listener usually listens at a position biased to
the speaker arrangement, the arrival time difference of sound waves from the left and right
skaters to the listening position And the difference in level occurs, and the sound image position
is biased to the speaker position closer to the listening position because the interaural phase is
close to the opposite phase over the wide range of the low to mid range, and the unnatural There
is a problem that it becomes sound image localization. On the other hand, although a means for
correcting the opposite phase by correcting the amplitude or time difference of one of the
channels is used, this means, for example, if it is corrected so as to eliminate the negative phase
at the driver's seat. On the opposite side, there is a drawback that the sound quality deterioration
becomes even more severe in the front passenger seat. Therefore, the present invention corrects
and cancels the phase difference in the listening position between channels caused by the biased
listening position in one side channel, and alleviates the sense of opposite phase at each listening
position on the left and right. It is an object of the present invention to solve the problems and
drawbacks of the above-described conventional example. [Means for Solving the Problems] The
on-vehicle stereo reproducing apparatus according to the present invention for achieving the
above object will be described with reference to FIG. 1 showing the structure of the embodiment.
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1
The digital filter 2 for phase correction is connected to the system, and the signal delay circuit 7
is connected to the reproduction system of the other channel, and the reproduction sound of the
left channel speaker 4L when both right and left channels are driven in normal phase And the
phase difference between the left and right channels becomes -Ph (+) when the phase difference
at the listening position between the right channel speaker 4R and the reproduced sound of the
right channel speaker 4R is Ph (1). An on-vehicle stereo reproduction apparatus, wherein the
band to be phase-corrected by the digital filter 2 in the vehicle stereo reproduction apparatus is
200 t. A vehicle stereo reproduction apparatus which is a ∼2KHs.
[Operation] In the car-like stereo reproduction apparatus having a habit like structure, for
example, in the embodiment, the output of the program source 6 is amplified by the right
channel power amplifier 3R through the digital filter 2 in the right channel, The right skier 4R is
driven to emit the reproduction sound of the right channel. Similarly, the output of the program
source 6 on the left channel is amplified by the left channel power amplifier 3L through the
signal delay circuit 7 and drives the left speaker 4L to emit reproduced sound on the left channel.
At this time, for example, at the listening position on the right side, that is, at the driver's seat 5R,
the reproduction sound of the right speaker 4R reaches the driver's seat 5R with almost no time
delay, but the reproduction sound of the left skier 4L separates the left speaker 4L from the
driver's seat 5R When the driver's seat 5R is reached, the phase difference is Ph (1). Since the
digital filter 2 performs phase correction by -Ph (f), in the right channel, the phase of the
reproduced sound from the right skier 4R is delayed by approximately one Phm, that is, Ph (1),
both channels in the driver's seat 5R The phase difference between them is [-Ph (f)]-[Ph (+)]-0,
and the right and left same phase, and no sense of opposite phase is felt. On the other hand, in
the passenger seat 5L symmetrical to the driver's seat 5R, the reproduced sound of the left
channel reaches the passenger seat 5L without phase delay, and the phase of the reproduced
sound of the right channel at the passenger seat 5L is determined by the digital filter 2 Since it is
the sum of the phase delay-Ph (1) and the phase delay due to the path length from the right
speaker 4R to the front passenger seat 5L-Ph (f), [-Ph (1)] + [-Ph (1)] =-2Ph (f). Therefore, the
phase difference between the two channels at the front passenger seat 5L is [0]-[-2Ph (f)] = 2Ph
(f). According to the experimental results of the inventors, the phase delay Ph (1) due to the path
length between the left speaker 4L and the driver's seat SR is approximately -180 ° in the band
of about 190 flt to 400 Ht as shown in FIG. , 500 Hs to 1,5 KH 寞, and it is approximately + 180
°, and by applying phase correction as shown in FIG. 3 by the digital filter 2, in the driver's seat
as shown in FIG. The phase difference between both ears at this point is O0, for example, when
the phase difference between both ears at the driver's seat is -1800, the phase difference
between the two ears at the passenger seat is 360 ° (= RO °) As a result, a sense of
oppositeness is resolved in the front passenger seat. When the phase delay at the driver's seat-Ph
(1) is not exactly 180 °, the phase difference between the two ears at the passenger seat 5L is
close to 0 ° when phase correction is performed according to the driver's seat 5R Thus, the
sense of hearing is improved as compared to the state in which there is a completely opposite
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phase band before the phase correction is applied.
FIG. 1 is a connection diagram showing a basic configuration of an embodiment of the present
invention, and between the left and right channel input terminals IL and IR and the power
amplifiers 3L and 3R, the right channel is FIR. Type digital filter 2 is connected, a normal delay
circuit 7 is connected to the left channel, and speakers 4L and 4R are connected to the respective
power amplifiers 3L and 3R. A program source 6 such as a compact disk is connected to the
input terminals IL and IH. In this embodiment, the speakers 4L and 4R are attached to the indash of a car, and the phase difference pb (+) of the reproduced sound of the left and right
channels at the driver's seat 5L has the characteristics as shown in FIG. . The FIR type digital
filter 2 has a constant amplitude frequency characteristic over the entire band, and the
coefficient of impulse response is set so that the phase shift characteristic becomes the
characteristic shown in FIG. 3 described above. In this embodiment, the signal delay circuit 7 is
inserted in the left channel. However, since the signal delay circuit 7 of the right channel has a
delay, the signal delay circuit 7 is inserted for time interrogation. It is In the above embodiment,
even when the left and right channels are switched, the operation is the same. Therefore, even if
the digital filter 2 is inserted into the left channel, the same effect can be obtained. As mentioned
above, although the in-vehicle stereo reproducing apparatus according to the present invention
has been described in detail based on the embodiment considered to be representative, the
embodiment in the present invention is not limited to the structure exemplified in the above
embodiment. The present invention can be appropriately modified and implemented as long as it
has the constituent features described in the claims described above, exhibits the action
according to the present invention, and has the effects described below. [Effect] The in-vehicle
stereo reproduction device of the present invention has the following effects. (1) FIG. 4 shows the
frequency characteristic of the phase difference between both channels at the driver's seat of the
in-vehicle stereo reproducing apparatus according to the embodiment. Compared with the phase
difference frequency characteristic between both channels at the same position in the case where
there is no correction shown in FIG. 2, IOOH 冨 ~2 KH that plays a major role in sound image
localization. The phase correction effect of the present embodiment can be confirmed because
the phase difference between the left and right channels is drastically reduced in the band of. (2)
By the phase correction effect, the frequency characteristics are improved with respect to the left
and right listening positions, and it is possible to obtain reproduced sound having natural
localization and timbre with less sense of reverse phase and sense of distortion. (3) Since only
one channel of the HR type digital filter for phase correction is required, the stereo reproduction
apparatus can be configured at low cost.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is an explanatory view of the structure of the embodiment of the present invention, FIG. 2
is a frequency characteristic diagram of the phase difference between both channels at the
driver's seat without phase correction, and FIG. 3 is the phase of the digital filter of the
embodiment. FIG. 4 is a transition characteristic diagram, and FIG. 4 is a frequency characteristic
diagram of a phase difference between both channels at the driver's seat when phase correction
is performed.
IL and IR are left and right channel input terminals, 2 digital filters, 3L and 3R are left. Right
channel power amplifier, 4L, 4R are left. The right channel speaker, 6 is a program source, and 7
is a signal delay circuit.
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