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JPS60223294

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DESCRIPTION JPS60223294
[0001]
TECHNICAL FIELD The present invention relates to a sound field correction device, and more
particularly to a device that corrects a sound field of a predetermined listening area in a sound
field produced by a direct radiation sound from a speaker and its reflection sound.
BACKGROUND ART As an example of an audio apparatus, a magnetic tape reproducing
apparatus, a system in which a reproduction signal from a reproduction head is converted into a
signal having a normal frequency characteristic by a reproduction amplifier having an equalizer
function and amplified, and the next stage graphic equalizer etc. The frequency characteristic
variable amplifier is adjusted to a desired reproduction frequency characteristic to be a speaker
drive signal. In the case of the sound system, the route reaching the predetermined listening
point 6 in the sound field shown in FIG. 2 is, for example, the direct sound as indicated by the
solid line 7 and the dotted line 8 as the sound radiated from the speaker 5. There is a reflected
sound from a wall as shown. In this case, at the listening point 6, peaks and dips occur at
frequencies that are due to mutual interference of sounds due to rain noise, and the frequency
characteristic at the listening point 6 is disturbed. Therefore, the disturbance of the frequency
characteristic is corrected by a graphic equalizer or the like. However, since the peak or dip
frequency changes depending on the installation state of the device or the change of the listening
position, the disturbance of the frequency also changes. Therefore, when it is going to correct |
amend this with a graphic equalizer, a lot of circuits will be needed and the adjustment will
become very difficult. Therefore, the applicant of the present invention has proposed a sound
field correction apparatus as shown in FIG. In the figure, an original signal input IN is delayed in
a delay unit 1 and applied to a level adjuster 2. The level-controlled signal becomes one input of
the adder 4 through the inverter 3 and is added to and superimposed on the original signal input
IN. The addition output OUT is a drive signal of the speaker 5 shown in FIG. In the sound field
shown in FIG. 2, one reflector may perform so-called fixed end reflection such as a wall or the
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like, and may generally be fixed end reflection), original signal INtS1 = Aej (Dt delay time by the
delay unit l Let-(Z2-Zl) / c and the adjustment level by the level adjuster 2 be KAL1 / 12. Note
that tl is the path length of the direct sound 7 of the speaker 5 up to the listening point 6, t2 is
the path length of the reflected sound 8 similarly, C is the speed of sound, A is the signal strength
at the vibrating surface of the speaker, and the reflection of the wall etc. It is a rate. The output
SD of the in park 3 is Sn "-(KAZ1 / 12) 'eJ (IJ (t- (1z-lt) / c)... = (1.degree.), And hence the output
of the adder 4 S. Becomes 5 o = S ? SD О A???t CKAt1 / 12) ej?Ct? (12??t) / c),, (2 ░).
This signal S is sent to the speaker 5. Is applied, so that the sound SM at the listening point 6 has
a signal strength of 17?Z 1 and a direct sound S8 with a time delay of t ? / C, and a signal
strength of 1,4 ? in reflectance. And it becomes synthetic sound with reflected sound SD which
has a time delay of 12 / C. Therefore, SM is the following equation. SM = 88 + 5D = (A / L1) '(c)
(t-'y') (KA / Zz) '[omega] (t- (12-11) 7 cm1 v'c)' s (KA / 12) g '[omega] (T?lz / C) ?CI <2 ? ?
CKAI, / 12) e ? (t?CL z ?L l) / c?1, / c) ?(A / 1 i) e ? (t ? ? 1 / C) -CKAI ? / 12 door (1) (t(21 ', -Z.) ? ?) (3) C, 0 ? 1,0 ? z1 / Because it is 12 times 1. The second term of the equation
(3) is sufficiently smaller than the first term, therefore, SM = + = (A / A,) e flea + (t?l?t / ?),.?
? ? ? ? ? ? ? (4), the reflected wave will be eliminated. However, in the above apparatus,
as shown in FIG. 2, although it is effective against the interference by one reflected sound 8, in an
actual sound field, as shown in FIG. Since a plurality of reflections from each wall of the sound
field to be received arrive at the listening point 6, it is impossible to cancel all the reflections
from this and the other. Reference numeral 30 denotes an audio reproduction system including
the apparatus shown in FIG. SUMMARY OF THE INVENTION The present invention has been
made to eliminate the above-mentioned drawbacks, and an object thereof is to provide a sound
field correction device capable of eliminating the influence of reflected sound. . The sound field
correction apparatus according to the present invention cancels a plurality of reflected sounds
arriving at different predetermined listening points in the sound field when adjusting the level
and phase of the original signal and superimposing the signal on the original signal. A plurality of
correction signals set with different levels and phases f 'are obtained from the original signal. A
zero-order embodiment according to the present invention will be described in detail with
reference to the drawings. 1 is a block diagram of an embodiment of the present invention, and
the same parts as in FIG. 1 are indicated by the same reference numerals. In the figure, the
original signal IN is input to n (n integers of 2 or more) delay devices 1 и 11 n, and each delay
output is output to n level adjusters 2 и 1 и 2 и n. Each is applied. Each level adjustment output is
superimposed on the input of the adder 4 and the original signal IN through n in parks 3 и 1 и 3 и
ni respectively. The addition output drives the speaker 5 through the power amplifier 9.
Here, the delay time ? and the level attenuation amount ? of the delay unit 1 и 1 and the level
adjustment unit 2 и 1 are the same as the side of FIG. 1, but the path 2 of the reflected sound 8
(see FIG. 2) and the direct sound It is set so as to be a function of the path length of 7 with ?, ?
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2) 1/1) / C and ? ? 2 ? 2, and cancel the influence of the reflected sound 8. The ? and ? of
the delay units 1 and 2 and the level adjusters 2 and 2 are the path lengths of the other reflected
sounds and the path lengths of the direct sound! , .Tau.-, () 3-11) / C and .alpha. =,. Likewise, as a
function of the path length of each reflected sound and the path length of the direct sound, each
reflected sound is set to be canceled. FIG. 5 is a block diagram of another embodiment of the
present invention, in which n delay devices 1 и 1 и 1 и xf are cascaded, and the delay outputs f n
from each cascade connection point are level adjusters 2 и 1. Input to 2 и n. And each level
adjustment output is made into each input of the adder 4 through n inverter 3 * 1-3 * n. The
other configuration is equivalent to the example of FIG. Here, the delay time of the delay output
of each of the delay units 1 и 1 to 1 и n is the sum of all the delay times by the front stage delay
units since the delay units are connected in series. That is, the reflected sound with the shortest
reflection distance is canceled by the output signal of the delay unit 1 and the reflected sound
with the second longest reflection distance is canceled by the output signal of the delay unit 1 и 2.
The same applies to other reflected sounds. The operations of the level adjusters 2 и 1 to 2en and
the inverters 3 и 1 to 3 и n are the same as in the example of FIG. FIG. 6 is a block diagram of still
another embodiment of the present invention in which a single inverter 3 is used in place of the
inverters 3 и 1 и 3 и 3 in the example of FIG. Therefore, each level adjuster 2 и 1-21? The output of
L is added by the adder 10 and supplied to the adder 4 through the inverter 3. FIG. 7 is a block
diagram of another embodiment of the present invention, in which a single inverter 3 is used
instead of the inverters 301 to 3-3 in the example of FIG. 5, and each level regulator The outputs
of 2 и 1 to 2 и n are input to the adder 10, and the addition output is applied to the adder 4 via the
inverter 3. Effects The present invention has the effect of being able to effectively correct
frequency characteristic disturbance n2 due to complex reflection in complex sound field space.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing an example of a sound field correction apparatus proposed by
the applicant of the present invention, FIG. 2 and FIG. 3 show an example of a sound field space,
and FIGS. FIG. 7 is a block diagram of each embodiment of
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