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Description 1 Title of Invention
Vehicle river noise-snow cover
The present invention relates to a vehicle acoustic apparatus that has a reference speaker and a
speaker for reverberation addition that is slower in transient response than the reference
speaker, thereby providing a better reverberation feeling of the reproduction sound. As shown in
the reverberation time-frequency characteristics of FIG. 6, generally, the cabin remaining time (a)
is generally less than the reverberation time (b) of a general radio room and the reverberation
time of a hole (compared to cl) In one car room, although the reverberation time in the middle
and high range is short, the reverberation time in the low tone is about 3 to 5 times longer and
the reverberation time is an ideal condition as the reverberation time-frequency characteristic,
that is, the reverberation time of the hall (c) There is a drawback that the reverberation time is
far from being flat with respect to the frequency as next. Therefore, as shown in FIG. 1 and FIG.
2, an attempt has been made to obtain reverberation using the electrical reverberation adding
apparatus 1. That is, in FIG. 1, the reverberation adding device 1 and the amplifier 2 are
interposed between the sound source 21 and one speaker 6, and the device is k. In FIG. 2, a
sound source 21 and two speakers 6.6 'are provided side by side, and only the amplifier 2 is
provided between the speaker 6 and the sound source 21, and between the speaker 6' and the
sound source 21 And an amplifier 2 'is interposed and k is EndPage: 1. The speakers 3.6 'are all
normal transient speakers. However, as shown in FIG. 1, the reverberation feeling obtained when
the reverberated signal is amplified by the 41 amplifiers 2 and the reverberant sound is emitted
from the one thousand child pickers 6 is the sound in the room. Unlike the reverberation that is
obtained by the reflection, there are drawbacks that can be felt unnaturally. 1) Even if this
reverberation system is large, it is expensive. Next, reverberation is added as shown in FIG. 2 to
make the sound and the noise not come out from another speaker 6.6 ′. Furthermore, a
dedicated amplifier 2 'is required to drive a speaker 6' for adding sound and adding a cost
amplifier factor with the reverberation adding device 1-0, the amplifiers 2 and 2 'are identical
Shoulder the function. The present invention has been made in view of the above-mentioned
point, and it is a k-type, in which a reference speaker and an additional speaker for reverberation
are combined and connected via an amplifier 2. Hereinafter, FIGS. 6 to 5 also show an
embodiment of the present invention, and the fifth embodiment [g '(a) is the first embodiment.
The same parts as those in FIG. 2 of FIG. As shown in FIG. 6 (a), a reference 7-peaker 6 and a
speaker 6 for reverberation addition with a slow transient response are provided in the vehicle
compartment. A reference speaker 6 has a reverberant structure having a slower transient
response than that of the reference speaker 6 and is a reverberation: addition speaker.
In this reverberation adding speaker 6, for example, a coiled spring of three different lengths for
reverberation is attached to the side of a rigidly close contact with a voice coil of a known
speaker. One end is fixed and the spring's vibration is completely reflected. When the voice coil
vibrates, the coiled spring vibrates longitudinally to store vibrational energy and return to the
voice coil for a fixed period of time. In addition, this reverberation-adding speaker 6 has a
plurality of resonance frequencies in the punctuation frequency band, and the damping Q is
worse by making the sharpness Q of # swing at each resonance point larger than that of
bifurcated The response is slow <t, yc throughout the band (50H2-15KH2). Fig. 4 (a 示 し) shows
the layout of the loudspeakers of the above-mentioned first embodiment. Fig. 4 (a 塙) is a fc
diagram, in which the reference loudspeaker 3 and multiple V of reverberant power 6 with slow
transient response are disposed. In the figure, 10 is a parcel shelf, 11 is an instrument, 17!
Indicates a dash panel, and 1-5 indicates a door trim. According to the above configuration, the
present invention breaks down the following effects. The sound source signal is sent to the sound
source 21 and is amplified to a speaker driving signal by the amplifier 2, and the music
reproduction sound is emitted from the reference speaker 6 on one side, and the reverberation is
generated from the other reverberation adding scourer 6 The added music reproduction sound is
emitted. Explain the above with reference to FIG. In (a), the input waveform (b) of the music
signal to the speaker is a plaster reproduction sound waveform radiated from the reference
speaker (c) is the music reproduction sound waveform radiated from the reverberation addition
speaker. Therefore, the reference speaker 6 quickly follows the input waveform, but the
reverberation adding speaker 6 is synthesized with those whose response is slow and the music
reproduction sound in the vehicle interior becomes ((dl). Therefore, as with the conventional
reverberation-applying device, it is possible to obtain a quick rise of the reproduced sound and a
good reverberation. In addition, a slight sense of time difference between the reference speaker
and the reproduction sound from the reverberation speaker can provide a sense of distance and
presence. Furthermore, a simple and inexpensive reverberation apparatus can be obtained as
compared with the conventional structure. Furthermore, if one reverberation adding speaker is
used in a large number with one reference speaker, the reflected wave or indirect wave
component to be reverberation will produce the same effect as coming from various directions,
and it will be natural. Reverberation can be obtained. Next, a second embodiment of the present
invention is shown in FIG. 6 (b). FIG. 6 (b) shows the volume of the reverberation and its
frequency band with the capacitor 20 and the resistance attenuator 7 interposed between the
reverberation speaker 6 and the amplifier 2 of the first embodiment. So that they can be selected
The capacitor 20 works only in the middle to high range of the reverberation speaker 6 (but not
in the low range). Therefore, EndPage: binary value determined by the reverberation time i in the
low range. That is, when the condenser 20 is interposed, only the reverberation of middle and
high tone is added, and the reverberation time frequency characteristic of (a) of FIG. 6 is broken
and smoothed as shown by a. The 1 resistance attenuator 7 is inserted for adjusting the
reverberation volume, and using the knob and other adjustment operation means, while listening
to the sound from the finished quasi-speaker 6 and the reverberation adding speaker 6, the
reference speaker 3 is used. On the other hand, the reverberation volume is manually adjusted
arbitrarily. Wangan resistance attenuator 7 and Conden? In the case of interposing 20t, in
addition to the effect of the first embodiment, the volume of the reverberation sound of the
remaining additive speaker and its frequency band can be appropriately selected. As another
embodiment of the present invention, either one of the capacitor 20 and the resistance
attenuator 7 can be interposed between the reverberation speaker 6 and the amplifier 2. .
4. Brief description of the drawings FIGS. 1 and 2 are block diagrams showing different
conventional examples when it is intended to obtain reverberation using an electrical
reverberation adding apparatus. FIG. 6 (a) is a block diagram showing a basic structure of the
present invention, and FIG. 6 [t (b) is a block diagram showing another embodiment of the
present invention. Figs. 4 (a) and 4 (b) are layouts of the speaker according to the embodiment of
the present invention in the vehicle compartment, Fig. 5 is a waveform diagram showing an
example of transient response waveform of reproduced sound with respect to the speaker input
waveform, The figure shows the reverberation time-frequency characteristics. 1 '-Reverberation
device -2, 2' ... Amplifier 3.6 '... Reference speaker 6 ... Reverberation speaker 7 ... Resistance
attenuator 10 ... Parcel shelf 11 ...・ Instrument 12) ・ ・ ・ Dash panel 16 ・ ・ ・ Door trim
20 ・ ・ ・ Condenser 21 ・ ・ ・ Sound source applicant Nissan Motor Co., Ltd. EndPage: 3