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JPS60234000

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DESCRIPTION JPS60234000
[0001]
FIELD OF THE INVENTION The present invention relates to a stereo device for motor vehicles
intended for high fidelity reproduction. (Constitution of the prior art and its problems) In recent
years, the stereo equipment for automobiles has also been upgraded, and also in the car interior,
a device equal to or more than a home stereo equipment has been required. FIG. 1 is a block
diagram showing an example of a conventional automobile stereo device. In the figure, reference
numeral 1 denotes a tuner which receives a broadcast, and a portion serving as a sound source
such as a tape deck for reproducing a cassette tape, which is hereinafter referred to as a radio
cassette unit. Reference numeral 2 denotes a dual type left and right balance volume for
balancing the output levels of the left (L) and right (R) stereos of the radio cassette unit 1. The
upper side of the output of the radio cassette unit 1 is the L channel, and the lower side is the
output of the R channel. Reference numeral 3 denotes a quadruple of volume for level
adjustment received between the left and right balance volume 2 and before the power amplifier
input, and a front and rear balance volume for balancing the volume in the front and rear
direction of the vehicle compartment described later. It is. Reference numerals 3RF, 3LF, 3LR,
and 3RR are volume adjustment volumes for adjusting the levels of the front right, left front, left
rear, and right rear power amplifiers in the vehicle interior, respectively. 4RF、4LF、
’4LR。 Reference numerals 4RR denote power amplifiers for driving the front right, front
left, rear left, and rear right speakers in the vehicle interior, respectively. 5RF。 5LF, 5LR, 5RR
are power amplifiers 4RF, 4LF, 4LR respectively. It is a speaker installed right front, left front, left
rear and right rear of the vehicle interior connected to 4RR. The reference numeral 6 denotes a
passenger compartment in which the speaker is installed, and the reference numeral 7 denotes a
steering wheel for operating a car. The stereo signal of the radio cassette portion 1t) 1t 5 passes
through the left and right balance volume 2, and is adjusted to an appropriate left and right
volume balance. The signal passing through the left and right balance volume 2 is added to the
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front and back balance volume 3. This volume is used to adjust the volume in the passenger
compartment 6 back and forth. For example, the L channel signal from the left and right balance
volume 2 is a volume 3LF corresponding to the volume of the left front speaker 5LF of the front
and rear balance volume 3; It is added to the volume 3LR corresponding to the volume of the left
rear speaker 5LH, and the volume level can be changed at the same time because of the
interlocking volume type, as a result, it is possible to control the front and back volume level
balance. The R channel performs the same operation as the L channel.
The signals appropriately adjusted by these front and rear balance volumes 3 are power
amplified by the power amplifiers 4RF, 4LF, 4LR, 4RR corresponding to the respective volumes,
and reproduced by the speakers 5RF, 5LF, 5LR, 5RR in the passenger compartment 6 , To create
a stereo sound field in the passenger compartment 6. However, in the above-described
conventional configuration, the speakers generally installed in the vehicle cabin have the poor
sound quality due to the problem of the installation space. Specifically, the rear speakers have a
relatively large volume in the speaker cabinet, for example, by utilizing the trunk space of a car,
which is advantageous for bass reproduction, while the front speakers are in front of the driver's
seat. It is installed in a restricted area on both sides of the panel, or in the front left and right
doors, and its structure does not allow sufficient volume for the speaker cabinet, or the diameter
of the mounting speaker can not be increased. There was a drawback that sufficient bass
reproduction was not possible. Therefore, if the balance is changed from the state where only the
rear speakers are heard to the state where only the front speakers are heard by operating the
front and rear balance volume, the change in sound quality in the low tone range becomes
remarkable, especially causing a shortage of bass. The As described above, the two-channel, fourspeaker stereo device with two left and right speakers at the front and two left and right
speakers at the rear changes the sound quality when changing the front-rear balance of the
volume, In particular, there was a defect that caused a significant change in the bass feeling.
(Object of the Invention) The object of the present invention is to eliminate the drawbacks of the
prior art, and it is high fidelity which does not cause deterioration of sound quality, especially
lack of bass even when the front and rear volume balance is controlled in an automobile It is an
object of the present invention to provide a car stereo device that performs a degree of
reproduction. (Configuration of the Invention) The car stereo device according to the present
invention comprises a radio cassette unit serving as a stereo signal source, left and right balance
volumes for balancing the left and right volume of stereo signals, and outputs from the left and
right balance volumes respectively. After passing through the amplifier dedicated to the left and
right front speakers respectively, the circuit connected to the left and right front speakers, the
signal simply passing through the low pass filter, and the bypass filter, it also passes the front
and back volume balance volume This is a stereo device that adds the signal and connects it to
the left and right speakers with built-in power amplifier with acoustic feedback circuit, and
reproduces the sound, with a system configuration that always plays bass signals with emphasis
on the rear speaker. At any position of the volume and the front and back balance volume Can
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have, one in which it is possible to make the sound quality good sound field superior of the bass.
DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will
be described with reference to FIGS. 2 and 3. FIG. FIG. 2 is a block diagram of a car stereo system
according to the invention. In the same figure, the part which attached | subjected the code |
symbol same as FIG. 1 is the same as the structure of a prior art example. The upper side of the
radio cassette unit 1 is an L channel, and the lower side is an R channel. Here, the following
description can be represented by the description of only one channel because the operation of
the two left and right channels is the same. Therefore, only the left (L) channel will be described.
Reference numerals 81 and F constitute a front / rear direction balance volume together with the
left rear front / rear direction balance volume 9LR, and are left front / front direction balance
volumes. And it is connected to the left front power amplifier 4LF which drives the left front
speaker 5LF in the single room 6. The IOL is a bypass filter for the left channel, and is connected
in parallel with the low channel filter 11L for the left channel through the left rear longitudinal
balance volume 9LR and synthesized, and the output from the left and right balance volume 2 is
an acoustic feedback circuit for the left rear Power amplifier built-in speaker 12 is input to H. A
power amplifier built-in speaker 12LR with an acoustic feedback circuit is installed at the left
rear portion in the passenger compartment 6. The power amplifier built-in speaker 12LR with
the acoustic feedback circuit is close to a wide band by detecting the sound generated from the
speaker by a microphone etc. in proximity to the speaker and returning it to a drive power
amplifier installed in or near the speaker cabinet. Sound pressure frequency characteristics are
flat and low distortion is possible. The operation will be described below. The tuner generated in
the radio cassette unit 1 is basically adjusted into two signals for the front and rear speakers
after the left channel output from the cassette decoder is adjusted at an appropriate level by the
left and right balance volume 2 . The signal for the front speaker passes through the balance
volume 8LF and is adjusted in volume level through the balance volume 8LF, then amplified by
the left front speaker amplifier 牝 F and emitted as sound from the left front speaker 5LF of the
passenger compartment 6. On the other hand, the signal for the rear speaker is divided into both
the bypass filter IOL and the low pass filter 1 ratio. The mid-high range signal passing through
the bypass filter IOL is adjusted to an appropriate level by the left rear longitudinal balance
volume 9LR, and then combined with the low-pass signal passing through the low pass filter ILL.
The sound is emitted as a sound from the built-in power amplifier built-in speaker 12LR provided
at the left rear.
Here, the left front longitudinal balance volume 8LF and the left rear longitudinal balance volume
9LR are interlocking volumes, and when the left front longitudinal balance volume 8LF is raised
in volume so that the front / rear balance can be controlled, the left rear The fore-and-aft
direction balance volume 9LR operates so as to be closed. Moreover, the volume balance
adjustment of the reverse is also possible. The above operation was only for the left channel, but
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the right channel also has the same longitudinal balance volumes 9RF and 8RR, and interlocks
with the left rear longitudinal balance volume 9LR and the left front longitudinal balance volume
8LF. Because it is composed of four consecutive volumes, it becomes possible to control the
volume balance in the front and back direction simultaneously. As described above, according to
the present embodiment, a speaker incorporating a power amplifier with an acoustic feedback
circuit is adopted as the rear speaker, and in addition to the expansion of the reproduction band
of the bass region and the reduction of distortion, The low range signal is always reproduced, and
only the middle and high range signal is variable by the front and rear balance volume, so the
low range reproduction generally compensates for the drawback of the front speakers, which is
disadvantageous in terms of the structure of the passenger compartment, Even in this case, only
the bass part with little sense of direction of sound can be reproduced from the rear speaker, and
stereo reproduction of good sound quality with good balance as a whole is enabled. The cut-off
frequency of the signal of the rear speaker, the bypass filter and the low pass filter that enter the
system is selected to have a frequency of about 200 Hz or less, which makes it difficult for the
directionality of the sound to be detected by the ear. FIG. 3 is a block diagram of a car stereo
device according to a second embodiment of the present invention. It is substantially the same as
the first embodiment shown in FIG. 2, but in the front of the longitudinal balance volumes 8LF
and 8RF, in the first embodiment, in the first embodiment, the signal of the rear moon is directly
connected from the left and right balance volumes 2. It is intended to add the signal that has
passed through the bypass filter IOL and IOR that were in the path. In the operation when
configured as described above, the front speaker always reproduces only the mid-high range
signal by adding the bypass filter IOL and IOR to the front speaker path in the first embodiment.
It will be done. With such a configuration, the front speaker does not have to consider the
reproduction of the bass region at all, so the volume of the speaker cabinet can be reduced, and
the degree of freedom of the installation position of the speaker is expanded. Further, also in the
speaker unit design, since a large amplitude design of the vibration system corresponding to the
low frequency band signal is unnecessary, the cost can be significantly reduced.
Also in the second embodiment, a low-pitched band having no sense of direction to human
beings can be reproduced from the rear speakers, enabling well-balanced high-quality stereo
reproduction, and adjusting the front-rear direction balance volume in advance, It is possible to
realize low tone reproduction with the rear speakers and stereo reproduction with good sound
quality that is harmonized as a whole by middle to high tone reproduction with the front
speakers. (Effects of the Invention) According to the present invention, a speaker incorporating a
power amplifier with an acoustic feedback circuit is adopted as the rear speaker, and in
particular, the signal added to the rear speaker is The bass signal separated by the bypass filter
and the low pass filter is always reproduced independently of the front and rear balance volume,
so it is sufficient in the vehicle interior of the car regardless of the position of the front and rear
balance volume. There is an effect that can enable high fidelity reproduction including low range
reproduction. Furthermore, the cabinet size of the front speaker is small in volume because it
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mainly plays back middle-to-high range signals, enabling effective use and expansion of the
vehicle interior space and also having the effect of lowering the cost.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of a conventional car stereo device, and FIGS. 2 and 3 are block
diagrams of a car stereo device according to an embodiment of the present invention.
1 · · · Radio cassette part, 2 · · · Double wall type left and right balance volume, 3 · · · 4 wall type
front and rear balance volume, 3 RF · · · Right front speaker volume adjustment volume, 3 LF · ·
Left front speaker volume Adjustment volume 31, R · · · Rear left speaker volume adjustment
volume, 3 RR ... Right rear speaker volume adjustment volume, 4 RF · Right front speaker drive
power amplifier 441 F · · Left front speaker drive power amplifier, 4], R: left rear speaker drive
power amplifier, 4 RR: right rear speaker drive power amplifier, 5 RF, right front speaker, 5 LF:
left front speaker, 5 LR: left rear speaker, 5 RR: right Rear speakers, 6 ... cabin, 7 ... steering
wheel, 8 RF ... front right balance volume for the right front, LF: front left and rear direction
balance volume, 9LR: left rear front and rear direction balance volume, 9 RR: rear right and rear
direction balance volume, 10 L: bypass filter for left channel,], OR · · · Bypass filter for right
channel, lIL · · · Low pass filter for left channel, 11 R · · · Low pass filter for right channel, 12 LR · ·
· Speaker with power amplifier with acoustic feedback circuit for left rear, 12 RR · · · acoustic
feedback circuit for right rear Power amplifier built-in speaker. Patent Applicant Matsushita
Electric Industrial Co., Ltd.
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