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JP2005006315

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DESCRIPTION JP2005006315
PROBLEM TO BE SOLVED: To perform equalization of a convertible type automobile sound
system. SOLUTION: In a convertible type motor vehicle, there is provided a convertible type
vehicle sound system which performs equalization related to the state of the convertible roof in
response to a top state signal representing the state of the roof. In one embodiment, a function of
frequency is provided by a plurality of loudspeakers by providing a top-up signal when the roof
of the convertible car is raised and a top-down signal when the roof is lowered. As the power
emitted is substantially the same when the roof is up and the roof is down. [Selected figure]
Figure 1
Convertible car sound system equalization
[0001]
The present invention relates generally to the equalization of convertible convertible sound
systems, and more particularly, in response to the state of the convertible roof (top), convertible
convertible sound systems. Apparatus and techniques for adjusting the equalization of
[0002]
As background art, U.S. Pat. No. 5,023,914, which discloses nonminimum phase equalization of
vehicle sound systems, and corresponding to different vehicle configurations filed on Nov. 8,
2002 Reference is made to U.S. patent application Ser. No. 10 / 290,989, which discloses a dual
mode sound system having an optimization mode.
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1
The entire contents of these patent applications are hereby incorporated by reference into the
present application.
[0003]
SUMMARY OF THE INVENTION The object of the present invention is to provide a convertible
car sound comprising an equalization circuit and, in the convertible car, an equalization related to
the convertible top state in response to a top state signal representative of the roof state. To
provide a system.
[0004]
A sensor provides a top condition signal representative of the condition of the convertible roof.
The equalization circuit responds to the top state signal and performs equalization corresponding
to the state of the roof. In one particular form of the invention, the convertible car includes left
and right dash speakers, and the equalization circuit performs top up equalization when the roof
is up in response to the top state signal. , Including left and right equalization circuits that
perform top-down equalization when the roof is lowered. The sound system also includes a doorspeaker with a door-speaker equalization circuit, and in response to the top-state signal, top-up
equalization is performed when the roof is raised, and the roof is lowered. You can also do topdown equalization when you In addition, the sound system performs top-up equalization when
the roof is up, in response to the seat speaker in the seat, and the top-state signal, top-down etc
when the roof is downed, etc. And a speaker-to-speaker equalization circuit. The sound system
also provides top-up equalization when the roof is up, and top-down equalization when the roof
is down, in response to the center dash speaker and the top state signal. A central dash speaker
equalization circuit can also be included.
[0005]
As used herein, equalization circuitry operates with the other elements of the sound system, and
the acoustic power radiated into the listening area of the convertible vehicle is a substantial
portion of the audio frequency range (most) Means a circuit that is intended to change as a
function of frequency in a predetermined manner.
[0006]
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2
Other features, objects, and advantages of the present invention will be apparent from the
following detailed description in conjunction with the accompanying drawings.
[0007]
Referring now to the drawings, and more particularly to FIG. 1, there is shown a convertible type
automobile sound system according to the present invention installed in a convertible type
vehicle 11.
Left, right, and center dash speakers 12, 13 and 14 are installed on the dash of the convertible
car, respectively.
Left and right door speakers 15 and 16 are mounted on the front door, respectively. In or
adjacent to the left seat 25 and the right seat 26, the left seat left channel speaker 21, the left
seat right channel speaker 22, the right seat left channel speaker 23, and the right seat right
chanel speaker 24, The rear speaker is attached. A seven channel amplifier 31 including
equalization circuitry can be mounted under the passenger floor mat. Above the central console
33, a sound system control panel 32 can be mounted on the dash.
[0008]
Referring to FIG. 2, in one example embodiment, a block diagram is shown that represents the
logical arrangement of a system that uses seven channels to power different speakers. There are
signal sources 41 for supplying sound signals to channels 1 to 7 respectively. Also, each channel
receives a signal from top state signal source 42 that represents the state of the convertible roof
(convertible top). Channel 1 energizes the left dash speaker 12 with the front left input signal.
Channel 2 energizes the right dash speaker 13 with the right front input signal. The channel 3
energizes the left door speaker 15 by the left front input signal. Channel 4 energizes left channel
rear speakers 21 and 23 with the left rear input signal. Channel 5 energizes the right channel
rear speakers 22 and 24 with the right rear input signal. In one embodiment, channels 4 and 5
are left and right surround channels. The channel 6 energizes the right door speaker 16 with the
right front input signal. Channel 7 energizes central dash speaker 14 with a mono signal that is
half the sum of the left and right front input signals.
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[0009]
Referring to FIG. 3, gain (gain) as a function of frequency for top-up equalization 51 and topdown equalization 52 performed by left and right dash loudspeakers 12 and 13 by channels 1
and 2 respectively It is shown as).
[0010]
Referring to FIG. 4, top up equalization 53 and top down equalization 54 are shown performed
by channels 3 and 6 for left and right door speakers 15 and 16, respectively.
[0011]
Referring to FIG. 5, top-up equalization 55 and top-down equalization 56 performed by channels
4 and 5 on left channel rear speakers 21 and 23 and right channel rear speakers 22 and 24,
respectively. It is shown.
[0012]
Referring to FIG. 6, top-up equalization 61 and top-down equalization 62 performed by channel 7
to central dash speaker 14 are shown.
Preferably, the system comprises minimum phase magnitude equalization for all amplifier /
speaker channels, phase alignment equalization with all pass filter stages, and / or coherent. And
/ or delay the addition of noncoherent acoustic energy, or delay the acoustic energy to the front
speakers of the rear speaker, to create a forward-dominant sound stage with an enhanced sense
of spatiality. It is built and arranged.
[0013]
In practicing the invention, the associated top-up modes are generally adjusted to determine
minimum phase amplitude equalization, phase matching equalization, and delay.
The top down mode is set by adjusting the amplitude equalization using the difference in the
loudspeaker's raw (raw) sound effects (sound quality) between the top down and the top down be
able to.
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Preferably, in the top-down mode, the delay and polarity relationships between the front and rear
channels are different to produce a spatial and spectral impression similar to that obtained in the
top-up mode. In the top-up mode in this example, the signal to the rear speaker is delayed 5 ms
with respect to the signal to the front speaker, and the polarity of the signal to the rear speaker is
reversed to the signal to the front speaker I did. In top down mode, the rear signal to the rear
speaker is delayed by 6 ms with respect to the signal to the front speaker, and the polarity of the
signal to the rear speaker is inverted with respect to the signal to the front speaker It was not.
[0014]
This approach can also be applied to more complex systems and is not limited as to which nonminimum phase characteristics of which signal processing channel to change with respect to
which other channel. In this particular example, the signal to the rear speaker was delayed
relative to the signal to the front speaker, but in other systems the signal may be delayed relative
to the other set of speakers .
[0015]
The foregoing has described novel apparatus and techniques for a convertible automotive sound
system. It will be apparent to those skilled in the art that various uses and modifications of, and
departures from, the specific devices and techniques disclosed herein may be made without
departing from the inventive concepts. Accordingly, the present invention includes all novel
features and novel combinations within the devices and techniques disclosed herein, or any novel
features and novel combinations that they possess, and the spirit of the appended claims. And
shall be construed as being limited only by the scope.
[0016]
FIG. 1 is a plan view showing an example of an embodiment of a convertible type vehicle sound
system according to the present invention in a convertible type vehicle. FIG. 2 is a block diagram
of a system for providing an audio signal to power the sound system of FIG. FIG. 3 is a graph
depicting top-up and top-down equalization performed by the left and right dash speaker
equalization circuit. FIG. 4 is a graph depicting top-up and top-down equalization performed by
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the center dash speaker equalization circuit. FIG. 5 is a graph depicting top-up and top-down
equalization performed by the door-speaker equalization circuit. FIG. 6 is a graph depicting topup and top-down equalization performed by a seat-to-speaker equalization circuit.
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