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JPH04100500

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DESCRIPTION JPH04100500
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
on-vehicle audio reproduction apparatus for reproducing stereo signals in a car room. [Summary
of the Invention] The present invention arranges two speakers each at the left position and the
right position in the vehicle interior city direction j, and respectively generates left and right
output signals from the signal source. The signal is branched into the second and third path
signals, and the signal obtained by delaying the second path signal and the first path signal are
added and supplied to one of the slide forces, and the second path signal By adding the inverted
signal of the delayed signal obtained by delaying the signal and the third path signal and
supplying it to the other speaker, it is possible to obtain a large spread feeling while localizing
the sound image forward. [Prior Art] In a car room, the volume is small and the position of the
speaker attachment is limited, so the distance between the listener and the speaker is short, and
the left and right speakers can not be equally spaced from the listener. For this reason, car audio
has an unnatural sound image localization and little feeling of spreading. Therefore, as shown in
FIG. 4, the front speakers 2 and 3 and the rear speakers 4 and 5 are disposed in the front and the
rear of the vehicle compartment 1, and the left and right front signals from the reproduction
device 6 such as a CD player are The amplifier 7 ° 8 supplies the front speakers 2 and 3 and the
left and right rear signals to the rear speakers 4 and 5 via the amplifier 9.10, and the stereo
signal of the reproducing apparatus 1f 6 is supplied to the front speakers 2 , 3, the output from
the rear speakers 4 and 5 to make a sound so as to surround the listener, thereby trying to
compensate for the above-mentioned drawbacks. [Inventions try to solve IIm! However, such a
conventional device can not necessarily provide a sense of expansion, and sound image
localization is also located near the head. Further, as a method of obtaining a sense of spread,
there is a method of drawing a small amount of signals of the left and right opposite channels
and localizing the sound image outside the left and right speaker positions. However, even such a
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thing could not obtain a big effect. An object of the present invention is to provide an on-vehicle
acoustic reproduction device that provides a feeling of wideness that is lacking when acoustic
reproduction is performed in a vehicle compartment while maintaining steering force
localization. [Means for Solving the Problems] In order to achieve such an object, the present
invention places two speakers each at the front left and right positions of the vehicle interior, and
outputs left and right output signals from the signal source. Are branched into first, second and
third path signals, the delay signal of the second path signal and the first path signal are added
and supplied to one of the speakers, and said delay is believed It is characterized in that the
inverted signal of-and the third path signal are added and supplied to the Yano jcn speaker.
[For a1] When reproducing a stereo signal in the vehicle compartment, the present invention
uses the four speakers installed at the h11 force while keeping the separation of the left and
right output signals contained in the signal source as it is, and While the sound image is localized
forward, a large sense of spread can be obtained. Embodiments Hereinafter, embodiments of the
present invention will be described in detail with reference to the drawings. FIG. 1 shows a block
diagram of an embodiment of a vehicle-mounted acoustic device according to the present
invention, and FIG. 2 shows a layout diagram of an example of a speaker arrangement according
to the present invention. In the present invention, as shown in FIG. 2, a pair of instrument panel
speakers 11.12 are arranged at symmetrical positions relative to each other in the front left and
right instrument panel portions in the compartment 1, and also in the compartment Y A pair of
door speakers 13.14 are disposed at symmetrical positions relative to each other in the front left
and right door portions. As shown in FIG. 1, the right channel of the audio signal output from the
sound reproduction device 6 such as a CD player is branched into three paths +-, 1, L2 and T-3,
and one of them is divided into three paths. The signal of the path L2 is delayed by the delay
circuit 15, and after being attenuated by the variable resistance type attenuator 16, it is branched
into two, and one is inputted to the adder 17, and the signal of one path L1 is added to The other
is signal-inverted by the signal inverting circuit 18, and then input to the adder 19 to be added to
the signal of one path L3. After passing through the balance adjustment volume 20, these
addition results are respectively amplified by the amplifiers 21 and 22 and supplied to the
speaker 11.13. On the other hand, three channels L4. The signal is branched into L5 and L6, and
the signal of one of the paths L5 is delayed by the delay circuit 23, attenuated by the variable
resistance attenuator 24, and then branched into two, one of which is input to the adder 25; The
other signal is inverted by the inverting circuit 26 and input to the adder 27. The adders 25 and
27 perform addition of these input signals and the signals of the first and third paths L4 and L6,
and supply them to the speakers 12 and 14 through the balance adjustment volume 28 and the
amplifiers 29 and 30. There is. In this case, the delay time of the delay circuits 15 and 23 is made
variable, for example, in the range of 2 ms to 0.5 ms. FIG. 3 is a diagram showing frequency
characteristics of outputs of the speakers 11 to 14 according to the present invention, wherein
the output signal T of the speaker 11.13 and the output signal T of the speaker 12.14 are the
following (1) and ( The phase difference θ of these output signals is expressed as the following
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expression (3).
T □ = A + Ar-6-Jωτ = AJT; F7 dead 2-r-cost noise r J (ar ′ ′ ′ (1 + l′ ′ CoSωτ) · (1) T, =
A-Ar − e−J "-A Emma e j ta t (1-r cos ω r) (2) 1 + rc O 5 ω τ Note that A is an input, r is a ratio
to be added to each, and τ is a delay time (seconds). The frequency characteristic of the output
of the speaker is equation (1). From the calculation of the real part of (2), as shown in FIG. 3, dips
are made for each 1 / τ ratio. Further, the phase difference θ between the two speakers 11.13
and 12.14 also changes for each frequency according to equation (3). For example, when the
delay time τ is 1 ms, the frequency dip can be IK, Hz, and the phase difference is about ± 70 for
each lKH2 when the delay time is 0.7 ms with respect to the path Ll. It changes in the range of
degree. As a result, the localization of the sound moves between the speakers at every frequency
of 1/2 of the interval between the dip and the dip, and an unprecedented large spread can be
obtained with only one channel. The signals output from the two speakers are combined in space,
and as shown in FIG. 3, the frequency characteristics become almost flat, and the sound quality is
not greatly affected. The degree of effect can be adjusted by changing the level of the delay
signal with the variable attenuators 16 and 24. Needless to say, the present invention is not
limited to the above-described embodiment, and various modifications can be considered. [Effects
of the Invention As described above, according to the present invention, it is possible to obtain a
large spread feeling while localizing the sound image in the front of the vehicle compartment.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of one embodiment of the vehicle-mounted sound reproducing
apparatus according to the present invention, FIG. 2 is a layout diagram of an example of the
speaker arrangement according to the present invention, FIG. 3 is a frequency characteristic
diagram of each speaker output, FIG. Shows a speaker arrangement 8 of the conventional onvehicle acoustic reproducing apparatus.
Car room, 6 · · · Sound reproduction device, 11 ° 12 · Front speaker, 13.14 · · · Door speaker,
15.23 delay circuit, 16.24 resistance iiJ modified attenuator, 17 ° 19.25.27 · · · Adder. Patent
Applicant Tara Rion Co., Ltd. Attorney Attorney Attorney 1) Takesan Part 1 Fig. 112 Fig. 3 S
Remains-#-f
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