JP2002152900

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DESCRIPTION JP2002152900
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
volume control apparatus for balancing the volume of a front speaker provided at the front of a
vehicle and a rear speaker provided at the rear.
[0002]
2. Description of the Related Art Conventionally, a car-mounted audio apparatus has been widely
used, in which four speakers are installed at the front left and right and rear left and right of a
vehicle to listen to signals reproduced from broadcast, CD, DVD and the like.
[0003]
Also, in such a car audio system, it is possible to adjust the balance of the volume in the front and
back direction. In such a case, as shown in FIG. 3, when moving the balance point forward, the
fader input When the unit is moved to the front side, the volume of the front speaker does not
change, and the volume of the sound output from the rear speaker decreases with the amount of
movement of the fader input unit.
Further, when the fader input unit is moved to the rear side at the balance point, the volume of
the rear speaker is not changed, and the volume output from the front speaker decreases with
the movement amount of the fader input unit.
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[0004]
In the volume balance adjustment having such characteristics, for example, a passenger sitting in
a rear seat of a one-box car is a DVD player currently in widespread use, and a speaker on the
rear side of a movie etc. In the case of enjoying the main speaker as the main speaker, the
passenger performs balance adjustment from the center position to the rear side, but in actuality,
the volume level on the front side is only decreased, and in the listening position, it does not
extend to the front, Since the volume of the entire cabin changes (decreases), it is difficult to form
a realistic sound field.
[0005]
An object of the present invention is to provide a volume control apparatus capable of
performing balance adjustment of volume levels on the front side and the rear side without
changing (decreasing) the volume of the entire vehicle interior.
[0006]
According to the invention of claim 1, there is provided a volume control apparatus for balancing
the volume of a front speaker provided at the front of a vehicle and a rear speaker provided at
the rear, comprising the front or the rear. A volume equal to the volume attenuation of the front
or rear speaker at a predetermined position in the vehicle when the signal input to the rear
speaker is attenuated by a certain value K1 is the volume output from the rear or front speaker A
fade volume calculation unit that calculates an increase value k1 of an input signal to be
increased, and a signal connected to the rear or front speaker when the signal input to the front
or rear speaker is attenuated by K1 times And a control unit that increases k 1 times.
[0007]
In the invention of claim 2, the predetermined position in the vehicle is the center of the front
seat in the vehicle, the center of the rear seat or the center between the front seat and the rear
seat.
In the invention of claim 3, the attenuation amount when the sound waves output from the front
speaker and the rear speaker are transmitted to a predetermined position in the vehicle is
recorded in advance, and the recorded attenuation amount The volume reduction of the front or
rear speakers and the volume increase of the rear or front speakers are calculated based on
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[0008]
In the invention of claim 4, the relationship between the set position of the front and rear
speakers and the predetermined position is input, and the amount of attenuation is calculated
based on the input.
In the invention of claim 5, the adjustment values of the level adjustment means connected to the
front speaker and the rear speaker are respectively recorded, and the volume increase amount of
the front or rear speaker based on the recorded adjustment value and The volume increase
amount of the rear or front speaker is calculated.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will
be described with reference to FIG.
FIG. 1 is a block diagram of an embodiment of the present invention. In FIG. 1, reference numeral
1 denotes a vehicle, in which a front seat 2 located in front of the vehicle and a rear seat 3
located in the rear are provided.
[0010]
In addition, the front left speaker (SFL) 4 and the front right speaker (SFR) 5 at the front left and
right of the vehicle 1, and the rear left speaker (SRL) 6 and the rear right speaker (SRR) 7 at the
rear left and right, respectively. It is provided.
[0011]
Attenuators 8TFL, 8TFR, 8TRL and 8TRR are provided for the SFL4, SFR5, SRL6 and SRR7,
respectively. The R signal to be reproduced is input to the attenuators 8TFR and 8TRR, and the L
signal is input to the attenuators 8TFL and 8TRL. Be done.
[0012]
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Also, the reproduction signals whose levels are adjusted by the attenuators 8TFR, 8TRR, 8TFL
and 8TRL are amplified by a predetermined amount by the amplifiers 9AFR, 9ARR, 9AFL and
9ARL, respectively, and reproduced by the speakers SFR5, SRR7, SFL4 and SRL6.
[0013]
Further, in FIG. 1, reference numeral 10 denotes a setting value recording unit for recording
setting values described later, 11 denotes a loss recording unit, and 12 denotes setting values
recorded in the setting value recording unit 10 and attenuation amounts recorded in the loss
recording unit. And a fade volume calculation unit for calculating a signal amplification factor to
be described later based on the movement amount set in the fade input unit; 13 is a front left
speaker (SFL) 4 and a front right speaker (SFR) 5 and a rear left speaker (SRL) 6 and the rear
right speaker (SRR) 7 A full volume input unit for adjusting the volume of reproduced signals, 14
is a front left speaker (SFL) 4 and a front right speaker (SFR) 5 and a rear left speaker (SRL) 6
and an individual volume input unit for individually adjusting the volume of reproduced signals
reproduced by the rear right speaker (SRR) 7 for each speaker, 15 is shown in FIG. 3 in the prior
art A fade input unit for setting the amount of movement of the balance point from the center to
the rear side or front side by balance adjustment, 16 is a control unit, 17 is an interface (I / O),
and various values are controlled by the processor (CPU) 18 To the attenuators 8TFL, 8TFR,
8TRL and 8TRR.
Reference numeral 18 denotes a processor (CPU) responsible for control processing of the set
value recording unit 10, the loss recording unit 11, the fade volume calculation unit 12, the total
volume input unit 13, the individual volume input setting unit 14, the fade input unit 15 and the
control unit 16 is there.
[0014]
As shown in FIG. 2, the loss recording unit 11 has, for example, a center point P between the
front seat 2 and the rear seat 3, and is output from the front left speaker (SFL) 4 or the front
right speaker (SFR) 5. Attenuation amount L1 which attenuates while the sound wave reaches the
center point P and attenuation amount L2 which decays while the sound wave output from the
rear left speaker (SRL) 6 or the rear right speaker (SRR) 7 reaches the central point P Record in
advance.
[0015]
At the time of recording, the attenuation amount with respect to the distance obtained by
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experiment etc. is recorded in advance, and by inputting the distance to the center point P, the
loss recording unit 11 calculates and records the attenuation amounts L1 and L2. May be
[0016]
Also, the distance to the center point P is the distance D1 where the left and right speakers are
installed, the distance D2 where the front and rear speakers are installed, the distance D3
between the front speaker and the front seat P1, and the front and rear seats P1 and P2 It is also
possible to calculate the distance D4 by which is set by inputting.
[0017]
The operation of the present invention will now be described.
The volume output from the speaker is proportional to the level of the signal input to the
speaker.
[0018]
Assuming that the levels of the R and L signals input to the present apparatus shown in FIG. 1 are
equal, and the gains of the amplifiers 9AFR, 9AFL, 9ARL, and 9ARR connected to the speakers
are equal, the front left speaker (SFL) 4 The volume outputted from the front right speaker (SFR)
5, the rear left speaker (SRL) 6 and the rear right speaker (SRR) is proportional to the attenuation
of the attenuators 8TFL, 8TFR, 8TRL and 8TRR, respectively.
[0019]
Therefore, assuming that the attenuations of the attenuators 8TFL, 8TFR, 8TRL and 8TRR are
TFL, TFR, TRL and TRR, respectively, if input is made to increase or decrease the value K from the
entire volume input unit 13, then TFL = KTFR = KTRL = KTRR = K (1), and each attenuator
increases or decreases the same value of K.
[0020]
When the volume adjustment for each speaker is performed from the individual volume input
unit 14 and the attenuations of kFL, kFR, kRL and kRR are input to the attenuators 8TFL, 8TFR,
8TRL and 8TRR, respectively, TFL = K + kFLTFR = K + kFRTRL = K + kRLTRR = K + kRR (2)
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[0021]
Further, TFL, TFR, TRL and TRR of the equation (2) are recorded in the setting value recording
unit 10.
Further, assuming that the input from the fade input unit 15 is the center (attenuation amount KF
= 1), the total volume P at the position indicated by the point P in FIG. 2 is P = SV (TFL + TFR) L1
+ SV (TRL + TRR) L2 (3) However, SV is a product of the input signal (L signal, R signal) and the
amplification factor of the amplifier 9.
[0022]
In the following description, the total volume P represented by the equation (3) is normalized by
SV, and the normalized value is represented again by P: P = (TFL + TFR) L1 + (TRL + TRR) L2 (4)
[0023]
Now, when movement of the balance point (signal to the front speaker is KF attenuation (KF>
1.0)) is input from the fade input unit 15 to the rear side from the center, TFL and TFR become
TFL = KF (K + kFL T.sub.FR = K.sub.F (K + k.sub.FR) (5) From the front speaker at point P, the
volume P.sub.F is the sum of T.sub.FL and T.sub.FR in equation (5), P.sub.F = K.sub.F {(K +
k.sub.FL) + (K + k.sub.FR)} L.sub.1 )
[0024]
In the present invention, when the balance point is moved to the rear side from the fade input
part and the volume from the front speaker becomes PF shown by the equation (6), the volume
PR of the rear speaker is raised to point P. The sound volume in is set to be the same as the
volume before fade input shown in equation (4).
[0025]
That is, PF + PR = P (7)
[0026]
Now assuming that the signal amplification factor kR (kR = 1.0 to 0.0) for the rear speaker, PR =
kR (TRL + TRR) L2 = kR {(K + kRL) + (K + kRR)} L2 (8) Substituting the equations (4), (6) and (8)
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into the equation (7), KF {(K + kFL) + (K + kFR)} L1 + kR {(K + kRL) + (K + kRR)} L2 = {(K + kFL) +
(K + kFR)} L1 + {(K + kRL) + (K + kRR)} L2 (9)
[0027]
Therefore, kR is obtained from the equation (9) as kR = 1 + (1-KF) {(K + kFL) + (K + kFR)} L1 / {(K
+ kRL) + (K + kRR)} L2 (10).
[0028]
In the equation (10), (K + kFL), (K + kFR), (K + kRL) and (K + kRR) are recorded as TFL, TFR, TRL
and TRR respectively in the setting value recording unit 10 as described in the equation (2) L1
and L2 are recorded in the loss recording unit 11, and when the movement amount KF to the
rear side from the fade input unit 15 is input, the fade volume calculation unit 12 is the set value
recording unit 10 and the loss recording unit Data is read out from step 11 and the operation of
equation (10) is performed to calculate kR.
[0029]
When kR is calculated, the control unit 16 multiplies the attenuations of the attenuators 8TRL
and 8TRR by kR.
Also, when the operation for calculating the fade volume is completed, the control unit 16
records the value obtained by multiplying the attenuators 8TFL and 8TFR by KF and the value
obtained by multiplying the attenuators 8TRL and 8TRR by kR in the setting value recording unit
10, and In order to cope with the fade input, the attenuations of the attenuators 8TFR, 8TFL,
8TRL and 8TRR are set to the recorded attenuations.
[0030]
Further, when movement to the front side is input from the fade input unit 15 (KR attenuation
for the signal to the rear speaker (KR> 1.0), the attenuation values of the attenuators 8TRL and
8TRR are multiplied by KR.
[0031]
Further, assuming that the signal amplification factor for the front speaker is kF (kF = 1.0 to 0.0),
the fade volume calculator 12 calculates kF = kF = 1 + (1-KR) {(K + kRL) + (K + kRR)} Calculated
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by L2 / {(K + kFL) + (K + kFR)} L1 (11), the attenuation values of attenuators 8TFR and 8TFL are
multiplied by kF.
[0032]
After completion of the fade volume calculation operation, the attenuation values multiplied by
KR and kF are recorded in the set value recording unit 10, and the attenuation amounts of the
attenuators 8TFR, 8TFL, 8TRL and 8TRR to cope with the next fade operation. Set to the recorded
attenuation.
[0033]
In the embodiment, the center point P is provided at the center between the front seat 2 and the
rear seat 3, but as shown in FIG. 2, the center point P1 of the front seat 2 or the center point P2
of the rear seat 3 may be used. Also, P, P1 and P2 may be provided and switched for use.
[0034]
As described above, according to the present invention, the volume at a specific position in the
vehicle is equal to the volume before balance adjustment when the volume of the front or rear
speakers decreases at the time of volume balance adjustment of the front and back. Since the
volume of the rear or front speaker is increased, it is possible to create a realistic sound field
even if the balance adjustment in the front-rear direction is performed.
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