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JPH03211999

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DESCRIPTION JPH03211999
[0001]
[Industrial field of application] The present invention provides a natural sound image localization
for either of the listening positions, regardless of whether the left or right speaker arrangement
is listened to, for example, a driver's seat or a passenger's seat. The present invention relates to
an on-vehicle stereo reproduction apparatus that can be obtained. [Prior Art] Conventionally, the
configuration of a general in-vehicle stereo reproduction apparatus arranges a right channel
speaker and a left channel speaker at the front ends of a front seat as well known, and the right
channel speaker is driven by a 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, the listener listens at a position biased with respect to
the speaker arrangement, so the arrival time difference of sound waves from the left and right
speakers to the listening position Since the level difference occurs and both the ears are in a
phase near the opposite phase over the wide range of the low and middle ranges, the sound
image position is biased to the speaker position closer to the listening position, and an unnatural
sound with a large sense of opposite phase In order to solve this problem, for example, in
Japanese Utility Model Publication No. 634990θ, phase shifters for inverting the phase at
different frequencies are respectively connected to both or one of the left and right channels, and
relatively in a specific frequency band Although means for making the phase difference between
both channels different and correcting the arrival time difference is disclosed, this method
changes the relative phase between the fundamental sound and the overtone of the audio electric
signal by the action of the phase shifter. And sound quality signal waveform is changed there is a
disadvantage that deterioration. Therefore, the present invention corrects and cancels the phase
difference at the listening position between each channel caused by the biased listening position
in only the main frequency band in one side channel and cancels each other without causing
sound quality deterioration. An object of the present invention is to alleviate the sense of
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opposition at the listening position and to solve the problems and drawbacks of the abovedescribed 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 basic configuration of the present invention. A
low pass filter 1 and a high pass filter 2 for dividing the frequency band of the reproduction
system electric signal into two at a predetermined division frequency, and a phase shifter 3
connected in series to the low pass filter 1 to shift the phase of the low frequency side electric
signal And an adder 4 for adding the low-pass side electric signal and the high-pass side electric
signal passed through the high-pass filter 2 as a drive signal of the one channel. The on-vehicle
stereo reproduction device is further configured such that the predetermined division frequency
is 1008x to 2KI (x).
Although not shown in the figure, the input terminal is connected to the input terminal a, the
program source is connected to the a /, and the output terminal b1b 'is connected to the same
constituent members as the conventional one such as an amplifier and a speaker. [Operation]
And, in a car-like stereo playback device with a car-like configuration, for example, when the
right and left speakers are driven in normal phase, the reproduction sound of the right speaker is
right at the right listening position (that is, usually the driver's seat). There is almost no time
delay, and the right listening position is reached, but the playback sound of the left speaker has a
large phase difference between the left speaker and the right listening position, so when it
reaches the right listening position, the phase difference is Ph (f) It has become. At this time, if
phase correction is performed by -Ph (1) by the phase shifter 3, in the right channel, the phase of
the reproduced sound from the right speaker is delayed by about -Ph (1), that is, Ph (f). The
phase difference between the two channels at the listening position is [-Pb (f)]-[Ph (1)] = 0, so
that the right and left phases are the same and the opposite phase can not be felt. On the other
hand, in the left listening position (passenger seat) symmetrical to the right listening position, the
reproduced sound of the left channel reaches the left listening position without phase delay, and
the phase of the reproduced sound of the right channel at the left listening position is Since it is
the sum of the phase delay -Ph (f) due to the phase shifter 3 and the phase delay -Pb (f) due to
the path length from the right speaker to the left listening position, [-Ph (f)] + [-Pb (f) f)] = − 2Ph
(r). Therefore, the phase difference between the two channels at the left listening position is [0]
− [− 2Ph (D) = 2Pb (1). According to the experimental results of the inventors, the phase delay
Pb (f) due to the difference in path length is approximately 90 [!] As shown in FIG. ∼400H!
In the band of approximately -1800 and 500H! ∼1.5KIl! The phase difference is
approximately 0 ° in the main band as shown in FIG. 4 at the right listening position, that is, at
the driver's seat, by performing phase correction with the phase shifter 3. Also, the phase
difference between both ears at the left listening position is approximately 360 ° (-〇 °), and
the phase reciprocity eliminates the sense of opposite phase even at the left listening position, ie,
the front passenger seat Do. Phase delay at the right listening position-Ph (If 11 is not exactly
180 °, if phase correction is performed according to the right listening position, the interaural
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phase difference at the left listening position becomes a value close to Oo That is, the sense of
hearing will be improved compared to the state where there is a completely antiphased band
before the phase correction is applied.
Furthermore, since the frequency band that receives the phase transition is limited to the low
band, the sound quality deterioration in the high band is alleviated. [Embodiment] FIG. 1 is a
connection diagram showing a basic configuration of an embodiment of the present invention, in
which a right channel is used to separate frequency bands whose phases are shifted following
respective input terminals a1a 'of left and right channels. A low pass filter 1 for band division and
a phase shifter 3 are connected in series to one transmission path, and a high pass filter 2 for
band division is similarly connected to the other transmission path. This band division frequency
is 4001 (! It is set to. The low pass filter 1 and the high pass filter 2 use an electronic circuit
similar to that of the conventional multi-amplifier system reproduction device in relation to the
phase shifter 3 and the adder 4 connected to the next stage. Although the phase shifter 3 is
configured to obtain a constant amplitude characteristic and a predetermined phase shift over
the entire frequency band, it is better in practice to make the amount of shift variable. The output
signal of the phase shifter 3 and the output signal of the high pass filter 2 are added by the adder
4 to be a right channel signal again and output to the right channel output terminal. An outline of
the circuit from the input terminals a and a 'to the output terminal b' in the embodiment
including the low pass filter 1, the high pass filter 2, the phase shifter 3 and the adder 4 is shown
in FIG. As an actual stereo reproduction apparatus, a program source such as a compact disc is
connected to each of the left and right input terminals a1a 'via a buffer amplifier, and each
output terminal bXb' is connected to an amplifier and a speaker as in the prior art. All the above
are connected (not shown). Further, in the above embodiment, even when the left and right
channels are interchanged, the operation is the same. Therefore, even if the phase shifter 3 is
inserted into the left channel, the same effect can be obtained. Furthermore, in the above
embodiment, for example, frequency characteristic control means for compensating the
frequency characteristic of reproduced sound may be added to an appropriate stage of the circuit
of FIG. 3 to perform sound quality compensation or loudness correction as an equalizer. Good. 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 suitably modified and implemented as long as it has
the constituent features described in the claims, exhibits the effects of 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) By the phase correction, the frequency characteristics are improved with respect to the left
and right listening positions, and it is possible to obtain reproduced sound having natural
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localization and timbre with less sense of reverse phase and sense of distortion. (2) Since the
frequency band that receives the phase transition is limited to the low band, the sound quality
deterioration in the high band is alleviated. (3) Since the phase shifter has only one channel, the
stereo reproduction apparatus can be manufactured inexpensively.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an explanatory view of the configuration of the embodiment of the present invention,
FIG. 2 is a phase difference frequency characteristic diagram between tongue and tongue at the
right listening position without phase correction, FIG. 3 is a schematic circuit diagram of the
embodiment, FIG. FIG. 4 is a phase difference frequency characteristic diagram between tongue
and tongue at the right listening position when phase correction is performed.
1 is a low pass filter, 2 is a high pass filter, 3 is a phase shifter, and 4 is an adder.
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