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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vehicle sound system #, and more particularly, to an acoustic system for a vehicle in which
excess and deficiency of a listening sound pressure relied upon based on the difference in layer
pressure position between front and rear occupants. . PRIOR ART A conventional vehicle acoustic
device is, for example, one shown in FIG. 1 (Nl 5 SAN Service Broadcast Report No. 428 (LP-1)
260 self). That is, the E number output from the stereo source 1 such as the tuner cassette deck
provided in the vehicle compartment is divided by the preamplifier 2 into left and right channels
ν: f + and further amplified by the main amplifier 3. On the other hand, the front door 5a is on
the front seat 4a, 4b side. Inside the 5b, left and right front speakers 5a and 5ib are provided
respectively for reproducing signals of the left and right channels, and on the rear seat 7 side, left
and right channels are reproduced respectively on both sides of the +1 Rear speakers 9a and 9b
are provided. A signal of the corresponding valley channel is inputted from the main amplifier 3
to each of the speakers 5a, b% 9a, b, and the front speakers 5a, b (!: IJ adjustment means for
sound 1d between the IJ speaker 9a, b The relative sound Jt adjustment is made by the fader
control which is the above and the balance control i / roll which is the sound-to-electricity
adjusting means between the left side speakers 6a and 9a and the right side speakers fia and 9b.
. Then, for example, when the occupants M, M, M3, M3 are seated on the front seats 4a, 4b, 'f &
seats 7, respectively, the fader and balance control positions are set, and the valley speakers (ia,
The reproduction sound cover from b, qa, b is equally set so that the sound image is set at the
center of the east direction (the sound image of a scale 1 ν 1 ヨ ン し). However, in such a
vehicle acoustic device M, the rear seat passenger M, in the sitting state, the front seat passenger
M, the front 11 passenger M, the ear position 11 to the force 114a force 9a, b of +114. If the
playback volume from the valley speaker 6alb + 9a + b is equalized as described above because it
is closer to 1 by the front speaker fia, b of M2 (as it is closer to a, squared front seats) t M + *
Appropriate for Mt If the listening volume is too low, the rear seat occupants M, M, will have an
excessive volume and become uncomfortable, and if the listening volume of the pullout 71II 11
squared negative M, M4 is made proper, the eye 11 The volume of listening to the seats J and
M2 becomes too small, resulting in the disadvantage that powerful playback sound can not be
Further, although it is possible to adjust the listening volume of the rear seat occupants M, M by
the above-mentioned fader control, this six-song is performed exclusively by the front seat
occupant MI + horse and the front seat Since the occupants AH and M2 can not directly hear the
listening volume of the rear seat occupants J and M4, they can not perform delicate control so
that the occupants have almost the same listening volume. SUMMARY OF THE INVENTION The
present invention has been made under the current situation of such a conventional vehicle
acoustic apparatus, and is provided with speakers for tl-stereo reproduction on both the ++ seat
side and the rear seat side. At least one seat side 'J! . A vehicle acoustic apparatus that makes it
possible to obtain approximately the same listening sound of the front and rear seat occupants
by automatically controlling the reproduction volume of the speaker based on the remaining
listening volume. The purpose is to provide In order to achieve the above object, according to the
present invention, an amplifier for amplifying left and right channel signals outputted from an
appropriate stereo source, and a vehicle interior for reproducing the respective signals amplified
by the amplifier. A plurality of speakers respectively disposed on the front seat side and the rear
seat side of the vehicle, a detection device for detecting the listening sound pressure in at least
one seat of the speaker, and a passenger having both degrees based on the output signal of the
detection device Control means for controlling the reproduction volume of each speaker is
provided so that the listening volume of the speaker is substantially equal, and automatic control
is performed so that the listening volume of a plurality of occupants is substantially equal.
EXAMPLES In the following, an example of the present invention will be described by attaching
the same reference numerals to the same parts and members as those of the conventional
apparatus. Front seat 4b as shown in Figure 2? The front microphone 10 and the rear
microphone 11 as detection devices for detecting the sound pressure of the reproduced sound in
the nucleus are provided at the left end of the note back 4b 'and the seat back 7' of the rear seat
7. The output signal of 11 is amplified by the amplifiers 12 and 13 and input to the comparator
14. As shown in FIG. 3, the 6 / comparator 14 has an A // D converter 15 or 16 that converts the
output of the nj j amplifier 12 or 13 into an A // D conversion. The output 1 is read and recorded
in a fixed cycle by the memory part 17 of the microcomputer, and the output from the memory
part J7 is inputted to the arithmetic circuit J8. Further, the comparator 14 is installed near the
front seat 4b (driver's seat), and the front speaker 6a is operated by the passenger.
A trimmer 19 is provided in which the balance ratio of the sound pressure of b and the rear
speakers 9a and 9b is set, and the set voltage value outputted from the nuclear trimmer 19 is A /
D converted by the A / D converter 20 and the arithmetic circuit 18 Has been entered. The
arithmetic circuit 18 thereby reads the sound pressure balance ratio of the front speaker 6a set
by the trimmer 19 and 1: and the take-off force 9a, b, and outputs the output from the front
microphone 10 (ie, reception on the front seat side). The listening pressure should not change
(and the output from the rear microphone 11 (that is, the listening sound pressure on the rear
seat side) is first output from the front microphone IO that has been CC10 by the memory
portion 17). In order to make it asymptotically to a value obtained by multiplying 11η by the
balance ratio of M'TN self-sound pressure, the system (al i @) is outputted to the control circuit
21. On the other hand, between the main amplifier 3 and the front speakers 6a and 6b and the
rear speakers 9a and 9b, front volumes 22 and rear volumes 23 are provided, and both volumes
22 and 23 are outputted from the control circuit 21. Is controlled by the predetermined control
signal. In the present embodiment according to the above configuration, when the occupant is
seated at the rear seat 7 by the control circuit 21, the balance and fader control are set to the
neutral position without controlling both the volumes 22 and 23 by the control circuit 21. When
sound is reproduced from each of the speakers 6 a r b * 9 a + b, as shown in FIG. 4 (A), an
equivalent value, for example, 0.5 V is input to each of the speakers 68 ° b, 9 a, b. The sound
pressure at the rear seat occupant's ear position close to the Yasby powers 9a and 9b is 85 t3. It
becomes B and becomes excessive for the rear seat occupants. Therefore, the microphones 10
and 11 and the comparators 14. The control (means) means of the arithmetic circuit 18 etc. is
turned ON. As a result, the listening pressure on the front and rear seats is sensed by the
microphones 1.0 and 11, respectively, and the pressure is output from the two microphones 10
and 11 to r corresponding to the sound pressure level. This output is amplified by the amplifier 13 and read by the comparator 14. The comparison 8.times.14 outputs the
predetermined control 13 to the control circuit 2I as described above, and the control circuit 21
outputs the control signal to this control signal. It automatically controls the front volume z2 and
the rear volume 23 based on the above.
Thereby, when the setting ratio of the trimmer 19 is set to 1 = 1, ie, to the same position for both
front and rear seats, for example, the front speakers 5a and b are automatically controlled to 06v
and the rear speakers 9a and b are automatically controlled to 0.3V. As a result, without
changing the sound pressure level on the rear seat side, the sound pressure level on the rear seat
side is 80 dB equal to that on the front seat side (the sound pressure ratio between the rear seat
side and the front seat side is 1 = 1) The two occupants can both obtain hearing at equivalent
sound pressure levels. Furthermore, as in the case of manually adjusting the balance and fader
controls, it is possible to obtain the sameness of the sound pressure level of both degrees without
substantially reducing the total sound pressure of the entire vehicle interior. In the present
embodiment, although the one using the microcomputer as the comparator 14 is shown, the
same operation can be obtained only by the circuit using the analog element, and detection
through the microphones IQ and 11 is also possible. Of course, the sound pressure to be
generated may be either an instantaneous value or an average value within a predetermined
time. FIG. 5 shows another embodiment of the present invention, which enables simpler volume
control. That is, on the front seat 4b and the valley seat backs 4b 'and 7' of the rear seat 7,
microphones + o and 11 similar to those of the above embodiment are provided, and output
signals from the microphones to and ti are the same as those of the above embodiment It is
processed by a similar control mechanism (not shown). On the other hand, the rear seat 7 is
provided with seat switches 24 and 25 which are turned on by seating of the occupant, and the
seat switches 24 and 25 are the power supply 26 of the main amplifier 3 and the switch 27
which opens and closes. It is connected to the. On the other hand, in the circuit between the main
amplifier 3 and the rear speakers 9a and 9b, a relay 29 and a variable resistor 30 are provided,
and the relay 29 is operated by an AND circuit 28 in l1fj. The front seat 4a. When the switch 27
of the main amplifier 3 is closed in a state where the occupant is seated only at b, the signal
amplified by the main amplifier 3 is transmitted to the rear speakers 9a and 9b without passing
through the variable resistor 30. At the same time, the front speakers 6a 'and b are also powered,
and playback is performed at substantially the same volume from each speaker. Then, when the
occupant shoulders to the rear seat 7, the seat switch 24 or 25 is closed, and the relay circuit 20
is turned off when it becomes the AND circuit 28 or Hlgh.
The circuit between b is changed to a circuit via the variable resistor 3o. このためメインアンプ
3からリヤスピーカ9a。 The signal to b is voltage-dropped by the resistor of the 'ciJ variable
resistor 3o, and the reproduced sound of the rear speakers 9a, b is automatically muted.
Therefore, the passenger seat sitting on the rear seat 7 is reduced by this mute to reduce the
number of excessive listening tones when the playback sound tones of the speakers fia, b, 9a, and
b are the same. It is possible to obtain substantially the same listening sound. The muting can be
set arbitrarily by changing the resistor of the variable resistor 3o, and in both embodiments, the
front speakers 6a and 6b and the rear speakers 9a and 9b are set to the same volume to obtain
the same volume before listening. Control of each speaker 6a. If 6b, 9a, 9b are controlled one by
one, it will be possible to equalize the listening volume more accurately than -c5 for each
passenger who is layered pressure on front seat 4a, b% rear seat 7. Become. As described above
in detail, according to the present invention, in the vehicle acoustic apparatus in which a pair of
stereo reproduction speakers are disposed on the front seat side and the rear seat side, the
volume of the passenger's listening volume in at least 10,000 seats. To automatically control the
playback sound t from each speaker so that the listening and hearing powers of the tribute
become almost equal based on this. The occupants of the seat that will be close to the speakers
can enjoy t3 of the circle raw sound at the proper double-handedness that is the same as the
other tiger occupants and without the excessive listening lid. . In addition, this allows the
occupants of the 10,000 seats to recognize the listening volume of the occupants of the other
seats from the listening volume of their own, so the rear occupants can be considered without
operating the fader control. It is possible to carry out a precise volume control. In addition, in the
embodiment shown in Ml, a microphone serving as a detection device for the listening volume is
provided in the = jl seat (III, and the listening volume of the rear seat and the front seat are
compared, and the listening volume is open By performing step 1, reception j can perform more
precise automatic control in response to changes in conditions, and in the second embodiment,
the configuration is easy to hear, so that the cost can be reduced. Effect that can be implemented.
Brief description of the drawings
FIG. 1 is an explanatory view showing an example of a conventional vehicle acoustic device, FIG.
2 is an explanatory view showing an embodiment of the present invention, and FIG. 3 is an
explanatory view showing a structure of a comparator according to the embodiment. FIGS. 4 (A),
(B1 is an explanatory view showing the operation of the embodiment, and FIG. 5 is a circuit
explanatory view showing another embodiment of the present invention.
Stereo source, 2 preamplifiers, 3 main amplifiers, 4 a, b-An seats, fia, b · left and right front
speakers, 7 · rear seats, 10 · · front microphones, 11 · rear microphones, 12.13 · amplifiers, 14
comparators 15, 16 · A / D converter 17 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · trimmer 20-A / D converter・ Borne for the front desk, 2: 3 for the rear. Fig. 3 + 5
dB 0 dB
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