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JPH03132200

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DESCRIPTION JPH03132200
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound reproduction apparatus mounted on a passenger car. [Summary of the invention] The
same signal as the signal output from the instrument panel speaker is output from the high-range
speaker (tweeter) installed with the radiation surface facing the windshield on the dash board,
and directly from the instrument panel speaker The sound and the signal of the early reflection
and reverberation are added and output, and the signal of the early reflection and reverberation
through the high-pass filter is output from the rear speaker, and the steep low-pass filter is
output from the door speaker. And the signal of the initial reflection sound through the steep
high-pass filter are added and output. [Prior Art] A conventional on-vehicle audio reproducing
apparatus has a CD player 1 and a radio 2, as shown in FIG. The audio signal from the cassette
deck 3 and the like is amplified by the amplifier 5 through the graphic equalizer 4 and output
from the speaker 6. The locations of the speakers 6 are (1) embedded in the rear barrel tray, (2)
embedded in the door or instrument panel, and (3) a combination of ijf persons. It was extremely
limited. [Problems to be Solved by the Invention] In the case of (1), a speaker with a relatively
large aperture can be used, so the low band can be reproduced sufficiently, but the sound image
is localized backward, in the case of (2) Although the sound is localized, but the listening position
is asymmetrical and close to the speaker, the sound image is offset, and in the case of (3) as well,
the sound image has a rich and expansive sound field, for example, the sound is localized around
the head. Even when the rear speaker is used only for low frequency reproduction, there is a
disadvantage such as separation of sound images. Therefore, as a method of compensating for
these weaknesses, frequency correction has been performed by the graphic equalizer. However,
there is an inability to compensate for the unnaturalness of the sound image localization, the
poorness of the sound, etc. which occur due to the distance between the speaker and the listener
being long. [Object of the Invention] The object of the present invention is to solve the above-
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mentioned drawbacks and reproduce the 5 lows sufficiently, to localize the sound image in front,
and to form a natural sound field without feeling the narrowness of the vehicle interior. It is an
object of the present invention to provide a sound reproduction apparatus for the purpose.
[Means for Solving the Problems] In order to achieve the above object, according to the present
invention, an on-vehicle L-type audio reproducing apparatus comprises: a signal source for
generating a stereo signal consisting of a left signal and a right signal; A first delay means for
generating respective first left and right delay signals for delaying the signal, and a second left
delay signal and a right delay signal delayed in time with respect to the first delay signal. A
second delay means for generating; first reverberation means for adding reverberation to the
second left delayed signal and the right delayed signal; and generating a first reverberation left
signal and a reverberation right signal respectively; A first addition means for adding a signal, a
first left delayed signal and a left reverberation signal to obtain a first left added signal, and
adding the right signal, the first right delayed signal and the right reverberation signal A first
addition means for obtaining a first right addition signal; Third delay means for obtaining a third
left delay signal and a right delay signal by respectively delaying high frequency components of
the right signal, and further delaying each of the third delay signals, and adding each
reverberation signal thereto; And means for generating a second reverberation left signal and a
second reverberation right signal, and adding the third left delay signal and the second
reverberation left signal to obtain a second addition left signal Second left addition means,
second right addition means for adding the third right delayed signal and the second
reverberation right signal to obtain a second added right signal, and each of the left and right
signals Means for generating a third left addition signal and a third right addition signal by
respectively adding the low-pass component signal of the low-pass component signal and the
high-pass delayed signal obtained by delaying the high-pass component signal of each of the left
and right signals; First speaker pair arranged at the door of the vehicle and the instrument panel
of the vehicle A second pair of speakers disposed, a second pair of speakers disposed on the dash
board of the vehicle, and a third pair of speakers disposed at the rear of the vehicle, wherein the
first left and right added signals are Supplying the second left and right addition signals to the
third speaker pair and supplying the third left and right addition signals to the first speaker pair;
As the abstract.
[Operation] If the left and right coefficient units are balanced for the driver's seat, the sound
image is localized forward by the direct sound output from the instrument panel scaker. Also,
localization is made further forward by a delay circuit. The delayed sound from the rear speaker
causes a spread of sound in the driver's seat left space. A spread occurs in the driver's seat right
space due to the delayed high frequency component from the door speaker. EXAMPLES The
present invention will be described in more detail by way of examples with reference to the
drawings, which are for illustration only and are not intended to limit the scope of the present
invention. Of course there may be. FIG. 1 is a block diagram showing the construction and
configuration of a vehicle-mounted sound reproducing apparatus according to the present
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invention, in which the reference numbers common to FIG. 7 are the same as or correspond to
those in FIG. 7 represents a tweeter, 8 an instrument panel speaker, 9 a rear speaker, 10 a door
speaker, 11 a low pass filter, 12 an A / D converter, 13 a signal processor, and 14 a memory. FIG.
2 is a block diagram showing the configuration of the signal processing unit 13 in FIG. 1, where>
is a coefficient unit and Φ is an adder. Nico represents a delay circuit and 0 represents a filter.
FIG. 3 shows the speaker attachment in position. The operation of the above embodiment will be
described below. The operation will be described using FIG. 1, FIG. 2 and FIG. The audio signals
(original signals) L and R from the CD player, tuner 2 and cassette deck 3 shown in FIG. 1 are
respectively converted into digital signals by the A / D converter 12, and the DSP (digital signal
processor) 13 The processing shown in the figure is performed, the signal is converted back to
an analog signal by the D / A converter, and the signal is output from the amplifier No. speaker
by the amplifier 5. FIG. 2 is a block diagram of only one channel, and in practice there is another
similar system for another channel. Details of FIG. 2 will be described below. (1) Instrument panel
speaker / tweeter original signal (direct sound): a signal (initial reflected sound) obtained by
passing the coefficient unit B and the delay circuit, passing the coefficient unit C1 delay circuit C
to the signal, A loop that is delayed by an arbitrary time by the delay circuit d and attenuated by
the coefficient unit (referred to as a delay loop in the main). Add the signal that passed through).
The original signal passed through the coefficient unit A is added to the signal, amplified by an
amplifier, and output from an instrument panel steering force. Instrument panel speakers are
often directed downward from the vertical plane, and sound localization may be low.
To solve the problem, a small tweeter is placed on the dash board to reproduce the same signal
as the instrument panel scaker. Then, by reflecting the sound on the front window and causing
the sound to reach the listener, it is possible to reproduce the diffused high sound and to raise
the sound image to the height of the head of the listener. (2) Rear speaker original signal through
high pass filter A, coefficient unit E, delay circuit e through initial reflected sound), coefficient
unit F, delay circuit f, coefficient unit G, delay circuit g The signals passing through the delay loop
(reverberation) are added, amplified by an amplifier, and output from a rear speaker. When
reverberation processing is performed in the low range, the sound becomes confusing. Therefore,
in the rear speaker processing, a high-pass filter is passed, the low band is cut, and the low band
is not delayed, so that a clear low band without stagnation when viewed as a whole system can
be reproduced. (* By applying delay processing to the high region, it contributes to feeling the
spatial spread as a reflected sound component. The cut-off frequency of the high-pass filter is
preferably 500 to 2 k. (3) Door speaker The signal passed through the coefficient unit H1 low
pass filter is added to the original signal, and the signal passed through the coefficient unit I, high
pass filter B, and delay circuit i (initial reflected sound) is added to the original signal, After
amplification by the amplifier #fi, output from the door speaker. In the processing for the door
speaker, the low band passed through the low pass filter and the high band delayed through the
high pass filter are added. Because the instrumental spring's bee force and the door speaker are
close (see 3 tl), the listener is at an equidistant distance from the listener. Therefore, the sound
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pressure (α) in the low band from the door speaker and the sound pressure (β) in the same
frequency band as the low band output from the door speaker out of the entire band output from
the instrument panel sicker are added. The sound pressure in the low range of the direct sound is
(α) + (β), which is a very rich bass. However, since there is a delay in the high frequency band
from the door speaker, it acts as a reflection that reinforces the direct sound. The sound pressure
of the direct sound is only the output from the instrument panel sby and the force. This time
series is shown in FIG. In addition, the low pass filter can be heard with crispness without
stagnating the bass by setting the cutoff frequency to 200 to 400 Hz and the attenuation amount
to 36 to 48 dB 10 ct. In addition, as shown in FIG. 5, the cutoff frequency and attenuation of the
high pass filter are set so that the low pass filter starts to increase from the frequency at which
the low pass is sufficiently attenuated1. Avoid interference between low and high frequencies
during speaker signal processing.
[Effects of the Invention] As shown in FIG. 6, with the direct sound (non-delayed signal) outputted
from the instrument panel speaker, the sound image is localized in front of the listener and the
direction of the sound reached by the human being at the beginning The sound image is further
localized forward (back) due to the delayed signal. Also, when viewed from the driver's seat by
the reverberation (a delayed signal) output from the rear speaker, the space on the left of the
listener is expanded, and the delayed high frequency component output from the door speaker
causes the listener's door to Spread also occurs in the space on the side. Furthermore, due to the
low frequency component output from the door speaker, even a speaker with a small aperture
can reproduce sufficiently low frequency from the front of the listener, and further, a
transmission frequency characteristic with a peak at 200 to 250 Hz peculiar to the passenger
compartment (Driver's seat, passenger seat) is also added, and the advantage of well-balanced
bass reproduction is obtained.
[0002]
Brief description of the drawings
[0003]
1 is a block diagram showing the configuration of a vehicle-mounted sound reproducing
apparatus according to the present invention, FIG. 2 is a block diagram showing the
configuration of a signal processing unit in FIG. 1, and FIG. Fig. 4 shows the temporal relationship
between the instrument panel speaker and the door speaker, Fig. 5 shows the image of the low
pass and high pass filter cutoff frequency of the output of the door speaker, Fig. 6 FIG. 7 is a view
showing an effect image of the present invention, and FIG. 7 is a block diagram showing a
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configuration of a conventional in-vehicle sound reproducing apparatus.
1 · · · · · · · · · · · · · · · · CD player, 2 · · · · · · · · · · · · · · · · · · · · · · cassette deck 7, · · · · · · · · · · · · · · · · · · · · · ·
························································································
························································································
· · · · cassette cassette deck 7 · · · · · · · · tweeter 8 ··· ′ ′ ······ Instrument panel ス ビ ー ー カ ー 9,
9 ····························································································· · low-pass filter, 12 and old · · · · · A / D converter,
13 ......... signal processing unit, 14 ......... memory.
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