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DESCRIPTION JPH02258444

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DESCRIPTION JPH02258444
[0001]
FIELD OF THE INVENTION The present invention relates to a car audio system. 2. Description of
the Related Art In recent years, in-vehicle audio equipment has become high-grade and highperformance due to the improvement of the performance of electronic parts, the production
accuracy of mechanical parts and the improvement of performance, and the pursuit of high
sound quality by users. In particular, recently, vehicles equipped with a CD (compact disc) player
device, which is a music reproduction device using digital signals instead of analog signals, can
be seen, and it is expected that the high sound quality will be further enhanced. On the other
hand, in the conventional car audio system, the volume adjustment is mostly performed by the
user (passenger) manually adjusting the volume knob or switch on the product panel surface.
[Problem to be Solved by the Invention] However, in the above-mentioned conventional example,
since the noise level in the passenger compartment is not constant, in order to listen to music etc.
in an appropriate state any time, according to the change of the noise level The user has to adjust
the volume, which is inconvenient and time-consuming. In particular, the noise level in the car
changes rapidly when going from a flat road to a bad road, and from a bad road to a flat road,
and the change in S / N ratio becomes large. There were also cases where it was not possible to
adjust the volume frequently. In such a case, if the volume is adjusted according to the noise level
on a flat road, it is almost impossible to listen to music etc. on a bad road, and conversely the
volume is matched to a noise level on a bad road In the case of adjustment, on a flat road, there is
a disadvantage that it is necessary to listen to music or the like of excessive volume. SUMMARY
OF THE INVENTION The object of the present invention is to improve the disadvantages of the
prior art and, in particular, to automatically adjust the S / N ratio following changes in the noise
level in the passenger compartment due to changes in the road surface during traveling. The
purpose is to provide an on-vehicle audio system in which the user can always listen to music
and the like at an appropriate volume. [Means for Solving the Problems] In the present invention,
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an audio device main body having a radio, a tape recorder, etc., an amplifier for amplifying an
audio signal outputted from the audio device main body, and an amplifier And a speaker. Further,
an electronic control unit for gain control (1) is attached to the amplifier, and a vehicle height
sensor is attached to the electronic control unit. The electronic control unit has a control function
of changing the gain of the amplifier according to the output from the vehicle height sensor.
By this, it is intended to achieve the above-mentioned purpose. DETAILED DESCRIPTION OF THE
PREFERRED EMBODIMENT An embodiment of the present invention will be described below with
reference to FIGS. 1 to 3. FIG. The embodiment shown in FIG. 1 amplifies an audio signal output
from an audio device main body 1 having a radio la, a tape recorder lb, and a CD player IC, and
the audio device main body l. An amplifier (AMP) 2 and a speaker 3 provided to the amplifier 2
are provided. The amplifier 2 is referred to as an electronic control unit for controlling gain
(amplitude) of the amplifier (hereinafter referred to as “rECU”). ) 4 is attached. Furthermore, a
vehicle height sensor 5 is juxtaposed to the input stage of the ECU 4 via the filter 6, and an
indicator lamp 7 is juxtaposed to the output stage. In the present embodiment, the ECU 4 has a
control function of changing the gain of the amplifier 2 in accordance with the output from the
vehicle height sensor 5. Here, the control function of the ECU 4 will be described based on FIG. 2
to FIG. As a premise of control, the ECU 4 performs initial processing. That is, the initial value
setting, for example, the data sampling time, the data sampling number, the setting of the control
amount, and the initial value setting of the gain of the audio amplifier 2 by the user are
performed (step 5IOI). In this state, the output signal of the vehicle height sensor 5 is input to the
ECU 4 through the filter 6 (S102). Next, the ECU 4 performs statistical processing on the output
signal of the vehicle height sensor 5 to determine whether the road is rough or flat (S103). The
relationship between the output of the vehicle height sensor 5 and the output of the filter 6 is as
shown in FIG. 3, but the output of the vehicle height sensor 5 is It has a gentle waveform. That is,
the actual road condition is relatively fresh and uneven. In this case, the noise in the passenger
compartment is removed by the filter 6 because it does not change. In this case, as the filter 6, a
filter that extracts the low frequency range (for example, 1.0 Hz to 100 Hz) of the audible range
among frequency components of the output signal of the vehicle height sensor 5 is used. The
ECU 4 samples the output of the filter 6 for a predetermined number of samplings for a preset
data sampling time 4, for example, about 10 to 20 seconds, and averages the data during that
time, I! I) The average of the amplitude of the output of the filter is taken and compared with the
previous calculation result to judge the rough road and the flat road.
That is, since there is no target of comparison, the average value V1 (see FIG. 3) is an initial value
2. The road surface condition is determined by comparing the average value {circle over (1)}
calculated at that time with the previous average value {circle over (1)} after two rounds.
Subsequently, the process proceeds to step 5104, in which one cycle of the ECU 4 is an initial
value 1. Since it is determined that the condition is, the gain of the amplifier 2 is not changed.
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That is, the gain of the amplifier 2 becomes the initial set value G0. After the second cycle, the
gain control signal is output to the amplifier 2 based on the control amount G set as described
later. The gain of the amplifier 2 changes according to the gain control signal. Next, the ECU 4
blinks the indicator lamp 7 in accordance with the output of the filter 6 to display the road
surface condition (S105). Next, the ECU 4 determines whether the road surface condition has
changed based on the determination result of step 5103, that is, whether it is necessary to
change the gain of the amplifier 2 (S106). Then, if it is not necessary, the process returns to step
5102. On the other hand, if you need to change. That is, if the road surface condition has
changed, it is determined whether "straight road → bad road" (S107). Then, in the case of "flat
road → bad road", 1?-V l =??, And using? G corresponding to??, G = C, +? G (CI is the previous
control amount) Thus, the gain control amount of the amplifier 2 is positively corrected (3108).
On the other hand, if it is not "flat road → bad road", it is judged as "bad road → flat road" and
the gain control of the amplifier 2 is made so that G = G2-ΔG (G is the previous control amount)
The amount is negatively corrected (S109). Thereafter, the process returns to step 5102 to
repeat the same control operation. As described above, according to the present embodiment, the
change of the S / N ratio due to the change of the road surface can be detected in a pseudo
manner using the vehicle height sensor 5, and the vehicle by the change of the road surface
while traveling There is an advantage that the S / N ratio can be automatically adjusted following
changes in the room noise level, and the user can always listen to music or the like at an
appropriate volume. Since the present invention is configured and functions as described above,
according to this, according to the functions of the vehicle height sensor and the electronic
control unit, it follows the change of the vehicle interior noise level due to the change of the road
surface during traveling. It is possible to automatically adjust the signal-to-noise ratio, and to
provide an unprecedented superior in-vehicle audio system in which the user can always listen to
music etc. at an appropriate volume.
[0002]
Brief description of the drawings
[0003]
1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart
showing a gain control function of the amplifier of the embodiment shown in FIG. 1, and FIG. 3 is
a vehicle height in the embodiment of FIG. It is a figure for demonstrating the relationship
between a sensor output and a filter output.
1 · · · · · · · · · audio equipment body portion, 1a · · · · · · · · · · · · · · · · · · · · · · · tape recorder, IC · · · · · · ·
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· · · · · · · · · · · · · · · · 3 ...... speaker, 4 ...... ECU as an electronic control unit, 5 ...... vehicle height
sensor. Fig. 3
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