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JPH03254163

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DESCRIPTION JPH03254163
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio apparatus for a vehicle that can accurately reproduce a sense of localization (stereo image).
(Conventional art) Conventionally, as an audio apparatus such as a car, a live performance is
performed by controlling the phase, arrival time, and the like of the front and rear left and right
speaker sounds, and adding reflections and reverberations similar to those at a concert hall. It
has been proposed to reproduce the adhesiveity (see Japanese Patent Application Laid-Open No.
62-216493). The above-mentioned publication technology is intended to enhance the sound field
effect by specifically attenuating the bass range of the reverberation signal with respect to the
treble range. By the way, as shown in FIG. 6, in the vehicle 1, the left front speaker PL and the
right front speaker PR are normally provided at the left and right positions of the front seat 2.3,
and at the left and right positions of the rear seat 4, the left rear A speaker RL and a right rear
speaker RR are provided respectively. Then, for example, with reference to the listener (driver) 5
seated on the right front seat 3, the right front speaker PR is at the closest distance Q to the
listener 5, and then the front of the distance Q, The distance becomes longer in the order of the
speaker FL, the right rear speaker RR of the distance Q3, and the left rear speaker RL of the
distance 124 << 1 (<Q, 〈< Q4). Therefore, as shown in FIG. 7, since the time t until the
reproduced sound of each of the speakers FRSFL, RR, and RL reaches the listener gradually
deviates and the feeling of localization (stereo image) decreases, the farthest distance Based on
the output signal of the left rear speaker RL of Q4, the output signal is delayed little by little in
order of the right front speaker RR of distance a3, the left front speaker PL to the distance, and
the right front speaker FR of the distance It is conceivable to perform processing to equalize the
time for the reproduction sounds of PR, PL, RR, and RL to reach the listener. (Problems to be
Solved by the Invention) However, if the volume (gain) of the reproduced sound of each of the
speakers PR, PL, RR, and RL is the same, even if the arrival time of the reproduced sound to the
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listener 5 becomes equal, Close distance 11112. Left front speaker FL, distance Q, with reference
to the volume of the right front speaker FH. The volume of the right rear speaker RR of the
distance Q3 and the left rear speaker RL of the distance Q4 gradually decrease, and there is a
problem that the sense of localization (stereo image) decreases. The present invention has been
made to solve the above-mentioned problems, and it is an object of the present invention to make
it possible to accurately reproduce a sense of localization (stereo image).
(Means for Solving the Problems) For this reason, the present invention relates to a vehicle
acoustic apparatus for reproducing output signals from a signal source with speakers arranged at
a plurality of locations in a vehicle compartment, and an output signal corresponding to each of
the speakers The delay time of the delay time and the attenuation factor of the output signal
corresponding to the delay time are set, and a control means is provided for adjusting the output
according to the delay time and the attenuation factor. It is preferable that the delay time and the
attenuation factor be set corresponding to the distance between the listening position and each
speaker. (Operation and Effect of the Invention) Since the present invention sets the delay time
and the attenuation rate of the output signal by the control means corresponding to a plurality of
speakers, the arrival time and the volume of the reproduced sound to the listener Becomes equal,
so that the sense of localization can be accurately reproduced. An embodiment of the invention
will now be described in detail with reference to the attached drawings. As shown in FIG. 1, the
on-vehicle audio apparatus includes a balance control circuit 11 for balancing left and right
signals of an audio signal (output signal) from a signal source 10 such as a cassette deck or a CD
player, and front and rear There are provided a fader control circuit 12, a delay circuit 13, and
amplifiers 14a, 14b, 14c and 14d for fading signals, and a right front signal and a left front
signal amplified by the respective amplifiers 14a to 1-1d. The right rear signal and the left rear
signal are reproduced on the hill by the speakers PR, PL, RR, and RL. The right and left signals
detected by the balance control circuit 11 and the front and rear signals detected by the fader
control circuit 12 are input to the delay circuit 13 as control signals. The delay circuit for setting
the delay time of the output signal corresponding to each of the speakers FRSFL, RR and RL is
incorporated in the delay circuit 13. The balance control circuit 11 and the fader control circuit
12 incorporate an attenuation factor setting circuit for setting the attenuation factor (volume) of
the output signal corresponding to the delay time. Then, the output adjustment is performed
according to the delay time by the delay circuit and the attenuation factor (volume) by the
attenuation factor setting circuit. Specifically, for the left and right output signals, the
relationship between the delay time and the volume as shown in FIG. 2 is set, and for the output
signals before and after, as shown in FIG. Relationship between the delay time and the volume is
set. For example, as shown in FIG. 5 (a), when there is a listener (5 FR) on the previous old sheet,
each speaker FR. Since the distances to PL, RR, and RL are in the order of 121 <C <Cs <124, the
delay time increases in the order of t, <T1 <T3 <T, and the volume becomes V1 <Vt <V, Assuming
that V4 increases in the order of V4, the speaker FR has a delay time t4.
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The volume is set to V1, and the speaker PL is t3. v, the speaker RR is set to t * V3, and the
speaker RL is set to t, V. As a result, the arrival time of the reproduced sound to the listener (5
FR) and the volume become equal, and the sense of localization (stereo image) is accurately
reproduced. Also, if there is a listener (5F1) on the front seat (Fig. 5 (b)), if there is a listener (5
RR) on the rear right sheet (Fig. 5 (C)), the listener on the rear left sheet ( The case where 5R1) is
present (FIG. 5 (d)) can be similarly controlled. This is summarized in the table below. Note that N
is a listener assumed to be at an equal distance g from each of the speakers FR, PL, RR, and RL
(FIG. 5 (e)). In this case, the delay time t, the volume V Is constant. In order to control the delay
time and the volume according to the listener, for example, a display panel as shown in FIG. 4 can
be provided on the instrument panel in the vehicle interior. A display for illuminating and
displaying the listeners 5PR, 5FL, 5RR, 5RL, N is provided, and on the upper side, a switch for L
(left), N (center), R (right), F (front), A changeover switch of N (center) and R (rear) is provided,
and a specific listener is indicated by lighting operation of each switch. In conjunction with the
illumination display, delay time and volume are controlled as shown in the above table. In
addition, the switching means to a specific listener may be a slide type volume other than the
above-mentioned bush switch.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of an acoustic device according to the present invention, FIGS. 2 and 3
are graphs showing the relationship between delay time and volume, FIG. 4 is a front view of a
display panel, and FIG. 5 (e) is a plan view showing the distance between a listener and each
speaker, FIG. 6 is a plan view of a car, and FIG. 7 is a graph showing the relationship between
each speaker and a delay time.
11 ... balance control circuit, 12 ... fader control circuit, 13 ... delay circuit, PR, FLlRRSRL ...
speaker, Q1 to Q4 ... distance, t1 to t4 ... delay time, 1 to 1 V4 ... volume.
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