close

Вход

Забыли?

вход по аккаунту

?

JPH04158700

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH04158700
[0001]
[Industrial Field of Application The present invention relates to an on-vehicle acoustic device
mounted in a vehicle compartment. SUMMARY OF THE INVENTION According to the present
invention, a high-range speaker pair disposed toward the side glass at least in front of the vehicle
compartment and a mid-range speaker pair disposed respectively on the left and right of the
single room ffJ; Speaker pairs disposed respectively on the left and right doors, a midrange
speaker pair disposed respectively near the left and right doors of the cabin, and at least a bass
component signal, a midrange component signal and a high-level signal from a sound source The
signal separation means for separating into the range component signals, the above-mentioned
low range component signal, the middle range component signal and the high range component
signal are delayed and supplied to the low range speaker pair, the mid range speaker pair and
the high range speaker pair Delaying means for achieving an optimum sound condition in the
vehicle interior and providing a comfortable sound field for the listener. [Conventional
technology] A conventional four-speaker system is generally used as a conventional car-mounted
speaker system, and a six-speaker system is becoming mainstream in recent years, and a fullrange type speaker is conventionally mounted. . As the reason for this, the space for installing a
speaker is narrow in the vehicle interior, and the full range type is the most effective. C. Problems
to be Solved by the Invention] However, the full-range type radiates from the low-frequency
component to the high-frequency component, and by placing weight on the overall balance,
focusing on the low-frequency and high-frequency sounds, a somewhat lacking surface remains .
Therefore, it was difficult to realize powerful bass reproduction, crisp bass, clear high-pitched
sound, etc. in the cabin. When viewed from the speaker installation side, conventionally, there are
many cases where a speaker is installed near the foot of the door. In this case, there was an
impression that the sound was cut off by a passenger's foot or the like, and particularly the high
range was insufficient. Therefore, coloration occurs when a person gets on, and a sense of
10-05-2019
1
discomfort can not be avoided. Also, conventionally. In order to give a sense of expansion,
mutually opposite phase components are added to the left and right signal outputs, and direct
sound and early reflection sound are emitted from the same speaker. However, in any of the
methods, the transmission frequency characteristic changes, and there is a sense of humility and
a sense of harmony. Furthermore, reverberation is an important factor to realize a comfortable
sound field. And, there is a reverberation time on the physical scale that represents this
reverberation. Conventionally, it is difficult to realize such a sense of expansion and pleasant
reverberation in a vehicle interior. An object of the present invention is to provide an on-vehicle
acoustic device that realizes an optimum acoustic state in a vehicle interior and creates a
comfortable sound field for a listener.
[Means for Solving the Problems] In order to achieve the above object, according to a first aspect
of the present invention, there is provided an on-vehicle acoustic device comprising a pair of
high-range speakers arranged toward at least front left and right side glass of a vehicle
compartment. A middle-range speaker pair disposed respectively on the left and right of the
steering force of the vehicle compartment, a low-range speaker pair disposed respectively on the
left and right doors of the vehicle compartment, and a sound source signal at least a bass
component signal; A signal separation means for separating into a high range component signal
and a high range component signal; a first delay means for delaying the low range component
signal to be supplied to the low range speaker pair; and delaying the mid range component signal
The present invention is characterized in that it comprises: a second delay means for supplying
to the middle range speaker pair; and a third delay means for delaying the high range component
signal to supply to the high range speaker pair. Further, according to a second aspect of the
present invention, in the device according to the first aspect, the second high-range speaker pair
disposed respectively on the upper left and the right of the compartment and the upper part of
the left and right doors of the compartment. A second pair of speakers for the second range, a
center speaker disposed toward the front glass at the front center of the compartment, and an
initial reflected sound signal from the high range component signal, and the second high range
First initial reflection sound generating means for supplying to the speaker pair, and second
initial reflection sound reproduction means for generating an initial reflection sound signal from
the midrange component signal and supplying to the second midrange speaker pair A fourth
delay means is provided for delaying the midrange signal and supplying it to the center speaker.
Furthermore, according to a third aspect of the present invention, in the device according to the
second aspect, the low frequency range speaker pair installed under the door of the cabin and
the transmission frequency characteristic correction means for correcting the upper low
frequency range component signal. It is characterized by having. Furthermore, according to a
fourth aspect of the present invention, in the device according to the third aspect, the midrange
speaker pair installed at the front left and right of the cabin and the transmission frequency
characteristic correction means for correcting the midrange component signal. It is characterized
by In the present invention, the direct sound is divided into three bands of low frequency range
10-05-2019
2
(for example, 20082 or less), middle frequency range (for example, 5 or less), and high frequency
range (for example, 5 kHz or more). It prevents changes in transmission frequency characteristics
due to personnel. In addition, a speaker that reflects high-frequency components is reflected on
the windshield or side glass to increase the sense of spread. Furthermore, for the sound output
from each speaker, the arrival time is adjusted so that the bass, midrange and treble range
components reach the listener's ears simultaneously.
Then, the level and time of the sound reaching the listener's ears are adjusted in order to correct
the localization even for the sounds output from the left and right speakers of the mid-range
component. First, an overview of the present invention will be described. In the present
invention, the change of the transmission frequency characteristic by the passenger is prevented
by separating the direct sound into three bands of low frequency components of 200 Hz or less,
mid frequency components of 5 kHz or less, and 5 high frequency components of Hz or more.
ing. And since the low-frequency component has a long wavelength and is close to
omnidirectional, it is emitted from the door near the listener's foot, and the middle-high range
component that has an important influence on sound image localization is the instrument panel
and instrument panel on the listener The speaker is installed in and emitted. In addition, a
speaker emitting high-frequency components is reflected on a front glass, a side glass or the like
to increase the feeling of expansion. In addition, for the sound output from each speaker, the
arrival time is adjusted so that the bass range, the midrange range, and the high range
component reach the listener's ears simultaneously. Then, the level and time of the sound
reaching the listener's ears are adjusted in order to correct the localization even for the sounds
output from the left and right speakers of the middle and high tone range components. From the
side of the listener, a reflected sound delayed by a certain time is output with respect to the
sound of the mid-range component emitted from the front side to increase the sense of lateral
spread. Furthermore, in order to increase the sense of vertical spread, the reflected sound of the
high range component is emitted near the head of the listener. As a result, the adjustment of
sound image localization and the sense of expansion can be made independent. A speaker that
outputs low-frequency components below 100 Hz is installed at the rear to make a powerful
sound. In addition, a speaker that emits sound with a ratio of 200 or more as reverberation is
installed to create a pleasant reverberation-rich sound field. Here, since the low frequency band
component of 100 Hz or less can hardly identify the position of the sound wave, it is combined
with the low frequency sound coming from the front also at the rear, and a powerful sound field
is formed. Hereinafter, an embodiment of the present invention will be described in detail with
reference to five drawings. FIG. 1 shows an embodiment of a vehicle-mounted acoustic device
according to the present invention, and only the left channel is shown in detail, but a device with
the same configuration as the right channel is provided in a dotted line. In the figure, 1 is a left
signal from a sound source, 2 is a network filter, 3 is a high pass filter (HPF), 4 is a band pass
filter (BPF), 5 is a low pass filter (LPF), and 6 to 13 are attenuators. 14.15 is an equalizer, 16 to
18 are initial delay circuits, 19 to 22 are delay circuits, 23 is a high pass filter (HPF), 24 is a low
10-05-2019
3
pass filter (LPF), 25 is a reverberation generation circuit, 26 Is an output terminal to the side
window tweeter, 27 is an output terminal to a ceiling tweeter, 28 is an output terminal to an
instrument panel speaker, 29 is an output terminal to an upper door speaker, and 30 is an output
to a center speaker Terminal 31, output terminal to the lower door speaker, 32 output terminal
to the super woofer, 33 output terminal to the rear speaker, ADD , ADD, is a summing circuit.
2 (a) and 2 (b) show an example of the speaker arrangement of the acoustic device according to
the present invention, wherein 26.degree. 36 is a side window tweeter, 37. 37 'is a sealing
tweeter, and 38. 38' is a ceiling. An instrument panel speaker 39.39 'is an upper door speaker,
40 is a center speaker, 41.41' is a lower door speaker, 42 is a superwoofer, and 43.43 'is a rear
speaker. Next, the overall signal flow of the embodiment of FIG. 1 will be described, and then the
operation of each part will be described in detail. In the left channel portion of FIG. 1, the left
signal 1 is applied to HP F 3, B P F 4, LPF 5 and attenuator 13 in the network filter 2
respectively. The output signal of i P F 3 is output to the output terminal 26 to the tweeter
through the attenuator 6 and the delay circuit 19 and is output to the output terminal 27 to the
tweeter 27 through the attenuator 7 and the initial delay circuit 16 . Further, the output signal of
BPF 4 is outputted to the output terminal 29 to the speaker of the instrument panel through the
equalizer 14, the attenuator 8 and the delay circuit 2o, and to the upper door speaker through
the attenuator 9, the HPF 23 and the initial delay circuit 17. Is output to the output terminal 29
of The output signal of the BPF 4 is also added to the right signal by the addition circuit ADD, and
is added to the output terminal 30 to the center speaker via the attenuator 10 and the delay
circuit 21. Also, the output signal of the LPF 5 is an adder circuit ADD. Is added to the right
signal through the attenuator 11, the equalizer 15, and the delay circuit 22 and is output to the
output terminal 31 to the lower door speaker while being output to the output terminal 32 to the
superwoofer through the attenuator 12 and the LPF 24. Ru. Further, the output signal of the
attenuator 13 is output to the output terminal 33 to the rear speaker via the initial delay circuit
18 and the reverberation generation circuit 25. The above signal flow is the same for the right
channel portion. The details of the operation of each part along the above-described signal flow
are as follows. (1) Network filter 2 The cutoff frequency is 5 for the high pass filter 3, 200 Hz to
5 for the band pass filter 4, and 200 Hz for the low pass filter 5. ? Full-range speakers are
common in the cabin. The reason for this is that the installation location of the speaker is limited,
and it is difficult to attach one with a large aperture.
However, when the full-range speaker is installed on the door of the instrument panel, the midhigh frequency components are affected by the directivity of the speaker and arranged by the
listener and the passenger. Therefore, it is desirable to place a speaker for low frequency
reproduction below the listener etc. and for middle and high frequency reproduction near the
height of the ears of the listener etc. (The middle high frequency component that contributes to
sound image localization is The speaker that emits these sounds is relatively stable in the
10-05-2019
4
horizontal plane) 6 further divided into three frequency bands so that the emitted sound waves
reach the listeners' ears simultaneously. Each time correction is performed by a delay circuit
described later. By dividing the zero frequency band into three bands, the vehicle interior
transmission frequency characteristics have flat characteristics even without using an equalizer
by appropriately setting the speaker output level, the speaker arrangement, and the crossover
frequency. Can be realized. In addition, each speaker output level can also have a function of a 3band equalizer. Here, the band pass filter may have a cutoff frequency of 5 kl (Z low pass a over
filter. In this case, the bass characteristic is added, the bass energy is increased, and the feeling of
force is increased. (2) The delay circuits 19 to 220.1 ms are configured to be variable. (2) Time
correction is performed so that sounds radiated from the low, middle and high range speakers
reach the listener's ear simultaneously. 1) The frequency band important for sound image
localization is the middle and high frequency components. Therefore, the sound image can be
localized at the front center by controlling the difference in arrival time of those sounds reaching
the listener. (3) Equalizer 14.15 In the middle to high frequency band important for sound image
localization, the transmission frequency characteristics of both ears are affected by the speaker
arrangement and the asymmetry of the listener. In particular, since the change of the frequency
component in the middle band is severe, correction is performed by the equalizer 14 in order to
flatten the transmission characteristic of the middle band. ? The interior of the car is
surrounded by a glass surface etc., so low frequency components are in an environmental
condition where standing waves are likely to occur. Low frequency standing waves are not
desirable as they do not give the perceived impression of a low tone. Therefore, correction is
performed by the equalizer 15 in order to suppress the peak due to the standing wave. (4) Initial
Delay Circuits 16 to 18 The initial reflected sound is a reflected sound necessary to realize a
natural feeling of spread. When the direct sound and the early reflection sound are emitted from
the same speaker, the transmission frequency characteristic is disturbed.
Therefore, a sub-speaker is required to emit the early reflection sound. ? The reason for
radiating the early reflections from near the ceiling is to achieve a feeling of vertical spread.
{Circle over (3)} The reason for emitting the initial reflection sound from the door speaker is that
the initial reflection sound from the direction of 60 ? ? to 90 ░ gives the most a sense of
lateral spread to the listener. (5) Low Pass Filter 24 For low-pitched bass reproduction even
among low frequency components, 1 oot (2 or less components are important. Moreover, 1 o
OHz or less is a component in which the position of the sound source can not be sensed.
Furthermore, the slope of this low pass filter changes the sharpness. (6) Reverberation sound
generation circuit 25 The reverberation feeling is that the residual sound of the sound is
comfortably left in the ear. For this purpose, it is important to build in consideration of human
auditory characteristics. The reverberation also has 'comfortable reverberation' and 'unpleasant
reverberation'. Because the volume inside the car is small, there is almost no feeling of
reverberation. The reverberation characteristics of a concert hall or the like have frequency
characteristics, and it seems that the frequency characteristics are constant or the low frequency
10-05-2019
5
band is slightly longer. In a car, booming of low frequency components is likely to occur, so it is
desirable that the reverberation characteristics be constant with respect to frequency. FIG. 3
shows an example of the initial delay circuits 16 to 19 of FIG. 1, ie, an initial reflected sound
generation circuit, and FIG. 4 shows in-panel sputtering not generated by the circuit of FIG. In
FIG. 3, R1-R1 is a variable resistor, .tau.1-.tau. Is a delay circuit, and AD,... AD are addition circuits.
FIG. 5 shows an example of the reverberation generation circuit 25 of FIG. In FIG. 5, A1 to A. Is
an adder, .tau., .About..tau. Is a delay circuit, g, .about.g4 is a feedback amplifier, and k1 is a
coefficient unit. In the embodiment described above, various acoustic modes can be realized by
varying the delay amount of the delay circuit, the cutoff frequency and attenuation amount of
each filter, the shape of the initial delay circuit, and the reverberation amount. These can be
easily realized by combining a DSP (digital signal processor) and a microcomputer. According to
the embodiment of the present invention described above, the following effects can be achieved.
(2) Localization correction In the two passenger compartments, the speaker arrangement is
asymmetrical to the listener, but by dividing the speaker band into three bands, localization
correction can be performed without losing the sense of stereo. ? Flat transmission frequency и
In the past, correction of transmission characteristics was performed with an equalizer, but by
dividing the speaker band into three bands, relatively flat transmission characteristics can be
realized, and the details i will be further described. By correcting with the equalizer, more
accurate correction can be performed.
? Rugged bass reproduction By reproducing the corrected bass from the door speaker, and
reproducing the bass less than 100 ratio from the rear, it is possible to reproduce the crisp bass.
? Forward localization: Forward localization can be realized by reproducing the middle and high
frequency components from the speaker installed in the instrument panel. ? Setting of each
sound field mode: For example, if a band pass filter for reproducing middle and high frequency
components is replaced with a low pass filter in the network filter, low frequency components of
the door and low frequency components emitted from the instrument panel speaker are added
More bass is output. This is an important mode as the driving condition is likely to be masked by
bass or noise. In this way, each sound field mode can be set as the second change in the system
parameters. This can be realized by using a DSP. [Effects of the Invention As described above,
according to the present invention, it is possible to realize an optimal sound condition in the
vehicle interior and to create a comfortable sound field for the listener.
[0002]
Brief description of the drawings
[0003]
10-05-2019
6
FIG. 1 is a block diagram of one embodiment of the vehicle-mounted acoustic device according to
the present invention, FIG. 2 is a diagram showing an example of speaker arrangement in a
vehicle compartment, and FIG. 3 is a configuration of an example of the initial delay circuit of
FIG. FIG. 4 is an output impulse pattern of FIG. 3. FIG. 5 is a block diagram of an example of a
reverberation generation circuit.
2иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииA
high-pass filter 4. Pass through fill 5, 16-18-------Initial delay circuit, 9-22 ..... Delay circuit. Fig.2
Fig.3 Fig.4 0 ?1?2?3
10-05-2019
7
Документ
Категория
Без категории
Просмотров
0
Размер файла
18 Кб
Теги
jph04158700
1/--страниц
Пожаловаться на содержимое документа