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# 4 # III nod name of the invention 2, #! ? In the claimable range, the low frequency band sand
component of the blue tatami signal shattered into the Naha-sen is th-shaped filter t / Cs
consisting of a delay means, 917 profit and add, and # by the speaker By adding valleys to the
low-pitched sound to the peak or valley, the peak or valley of the transmission characteristic of
the playback sound band can be banded to be supplied as an f% copy correction unit 0Nfr that
takes on the imitation Hu's story is related to the sound field correction device, especially to the
sound correction equipment which corrects the valley in the mountain 1 of the bass range noble
sound field Q transmission spiny. In general, the transmission characteristics in the inner ring are
innumerable ? (when there are ej convex, there are 2 rooms, 2 rooms are attached to the
mountain valley, the room is large, the line is large, the fixed local wave number is Vc noon) It is
known that there are many mountains. The intervals between mountains that occur in such
transmission characteristics are as tight as the pitch range and sparse in the low range. From the
listening point of view, sound fields where mountains are sparse are perceived as unpleasant, and
the degree increases as the mountains become steeper. Such mountains in the re-entering place
can be made flat by increasing the sound absorption of the house, but in order to apologize the
sound absorption of the low ? range component, a large amount of 1 & sound material is
required ,! I'm having trouble with the M-Ku songs In the case of a band pass filter castle or a
peak writing dip type frequency equalizer provided with normal sound 4IF + living equipment,
the frequency bandwidth to be controlled is relatively wide. The steepness of the transmission
characteristics (Qimi) can not be changed, that is, it is not easy to perform f'Ja correction with a
normal frequency equalizer. Also, in order to lower the peak of the transmission characteristics
with a band-pass filter or a notch filter, it is necessary to use a filter with a large number of filters
according to the number of peaks of the transmission characteristics, which is superior to narrow
ones. It lacks practicality. In view of such circumstances, it is also EndPage: 1 that the mountain
intervals that occur in the transmission characteristics of the room sound field are relatively
regular at low frequencies, It is an object of the present invention to provide a sound field
correction apparatus which can obtain a preferable reproduction sound field in terms of Ila
feeling and has a simple circuit configuration by using a comb-shaped filter which can easily
change the hardness. Next, in the embodiment according to the present invention H? First of all,
the comb-tooth filter used in book @ broken will be described. FIG. 1 shows two basic examples
of the comb filter, and FIG. 1 is a non-reciprocating 19j type filter, and FIG. 2 is a cyclic bacillus
cedar filter.
First, in the non-recursive 1io ceramic filter of FIG. 1, 1 is connected in cascade to n delay circuits
of the input terminal 01. An input terminal 01 and an output terminal of each of the delay paths
1 are connected to an adder 6 via a coefficient unit 2f that gives a weight of a coefficient aO * '1
* vall. The output terminal of the steady adder 6 is connected to the output terminal 02 of the
comb filter. Assuming that the delay time of each delay circuit 1 is T, Mllt & number transmission
characteristics between input and output terminals 01 and 02, that is, filter characteristics F (f), F
(f) = XJLkexp (12gkTf) -Just at the waist: arbitrary frequency, 1 = [represented by n. Here, for
example, assuming that the delay circuit 1 has two stages, and a6 = 1L2 = i / 4, al??1?2, F (f) =
co = (tTf) exp (i2rTf) и (2). Also, assuming that ao = j ? = ?1 / a, al = i, / 2, y (t) = e1 r?
???????????????????????? That is, in the equations (2) and (e), the
interval between the peaks is 1 / T, which represents the (2) tooth profile characteristics of the
0081 ne type and the 5 ins type, respectively. Next, in the cyclic tooth shape filter of FIG. 2, the
input terminal 01 is connected to the delay path 1 of the delay j waiting period T via the addition
h5. The output terminal of the delay circuit 1 is connected to the field terminal port 2 of the
filter, and is connected via the coefficient unit 2 which gives the coefficient l. Connected to 65.
The filter characteristic y (f) in FIG. 2 is F (f) = 17 (1-b @ exp (12 gTf))-=-. However, 0 which
satisfies lbl <1 represents a comb-like characteristic in which the distance between peaks is
17??r, and the positions of peaks and valleys differ between t ?? 0 and b ?0. Hereinafter,
preferred embodiments according to the present invention will be described with reference to the
drawings. FIG. 5 shows the basic recovery of the sound field patterning device as the first
embodiment. The name corresponds to the non-recursive filter shown in FIG. 1 at the time of ?
3 ton ?, and the delay circuits 11 and 12 of two stages of delay @ between T, coefficients a
respectively. A coefficient tooth filter is constructed by a coefficient addition giving a weight of '4
* al, 21.22 ░ and an adder 3. Furthermore, the low bus filter (hereinafter referred to as ?LPF?)
father between the input terminal port and the coefficient unit of the associated eaO is LP ? P
52 in the darkness of the tumor shell 12 and the coefficient unit n of the holding needle a2. Each
is inserted and connected. These LPF fathers 52 are for causing the low frequency range chest
wave number components (for example, 100 Hz or less and 250 Hz or less) to be subjected to
sound field correction to be traced.
When an analog shift register such as BBD is separated as 12, an LPF for band limiting is
inserted and connected before and after (input / output object-) of the shift register, and a clock
for driving the shift register. If a digital ? ? ? shift register is used for 0 or one jll extension 1y,
n, 12 which requires a pulse generator (see FIG. 6, citation 7), then the m / D converter and D are
additionally used. It is necessary to insert and connect after 111 of the A / A converter converter
register. For example, a. Assuming this to be r, r = 1 / a, and al = 1/2 in the low frequency band,
the comb-like characteristics shown by the above equation (1) are obtained, and r = ?174, a = 1
/. If it is only 2, it will become the characteristic shown by 0 type. The @ wave special condition
of the low sweet LPF 50.52 is regarded as one point suppression in FIG. 4A. Frequency response
of the circuit in Fig. 5: r (= a (== a2) = t15, al = 1) In Fig. 4, in case of r = -175, al = 1, Fig. 4
EndPage: 2A It becomes the characteristic shown by a broken line, respectively. ???? The
interval of the peaks is the inverse of the delay time T, that is, 1 / T. Next, with respect to the
case where the specific reproduction sound field correction is performed using the third section
(b), the second section will be illuminated since it is illuminated. Ship 5 illustration #! ! Shows the
transmission characteristics of the reproduced sound field without correction. Here, in the
characteristic (r = 1 / 3.a1 = 1) of the solid line in FIG. 4A, the sound is generated using the
circuit of FIG. 5 having the characteristic when the ag T = 25 ms, that is, 1 / T = 40 Hz. If
correction is made, the transmission characteristics of the reproduced sound field as shown by
the broken line in FIG. 5 can be obtained. ?????????? The peak of the transmission
characteristics near 60 Hz, 100 Hz'z f, the peak @, the sharpness is relaxed, e! A pleasantly sound
reproduction field is obtained. On the other hand, as apparent from the characteristics of FIG. 4
and FIG. 5, using the characteristics of r = ?1?3 and al = 1 at T = 25 m5 (refer to the broken line
in FIG. 4A), When the reproduction sound field is corrected, the peak of the transmission
characteristic is further reduced and becomes steep, so that the sense of discomfort in the aural
sense increases. When an excessive delay time T is given. The effect of the sound-correction is
different depending on the sign of r (= a (1 = a2)). If a good effect can be obtained with one of the
signs, the other sign is a lamp p. As described above, it is possible to perform the teaming of the
tonality correction apparatus by utilizing the difference in the effect due to the inversion of the
sign of r. By the way, according to experiments, it is preferable to equalize the peak values of the
transmission characteristics of the I /: 'r old 1 path when correction is actually performed.
For this reason, at the position after the input terminal o1 or in the position before the output
terminal 02 in the circuit of FIG. It is recommended that the Qtl number equalizer be inserted and
connected as shown in FIG. 4B so that it is possible to see if it is a @ thin characteristic @ thing
with the peak value of the transmission peak aligned with the response 1. In this FIG. 4B, the
laugh k '/ ir (= ao = a1) = 175, a1 = 1, the broken line is r = -1 / 3. The characteristic when al = 1,
the dashed-dotted line LP? The frequency characteristics of 9.52 are shown respectively. Next, a
second actual example will be described with reference to FIG. In this sixth case, the simplest
non-round-shaped (2) tooth-shaped noylus (+-) is constructed using BBD (Bakut-Bu, Ligd ?
tevise) 63 as a one-delayed power generator. That is, the input terminal 01, one input terminal of
the adder 6, the phase inverting circuit 60, the delay [gi path 61, and the other input terminal of
the adder ? via the attenuation pss as an equalizer] It is attached to. The phase inverting circuit
6fj inverts the phase of the overpassing 1-g according to the switching operation of the switch
67. This corresponds to inverting the sign of the coefficient, and as described above, the 0 delay
circuit # 661 in which the effect of inverting the peaks and valleys of the comb-shaped
characteristic is applied consists of the LPF 62, BBD 63, and LPF 64, and the BBD 63 It is driven
by a clock pulse from a kite. By changing the cycle of this clock pulse, the delay time T of the
delay Lo circuit 61 can be set arbitrarily. The LPF 62.64 is a low-pass filter for band limitation of
the BBD 63, and is a low pass filter shown in FIG. 3 w, and passes frequencies of 100 to 250 Hz
or less, for example. A conventional musical tone signal or noise or pulse signal sufficiently
containing a low frequency component is applied to the human power ladder. Since this sound
field correction apparatus is intended to obtain a well-reproduced sound field on hearing aids, it
is preferable to carry out the following adjustment while applying programmed sound to be
heard. Next, description will be given of the tuning section (teaming) at the time when the
sounding room in a given room is busy with the sound field of the sound field shown in FIG. First,
the changeover switch 67 is switched either fully automatically or manually periodically or II'i. At
this time, the pulse period of the clock pulse generator is adjusted at the time of lWi, the delay
time T is changed, and the distance between mountains of the working narrow profile is changed.
By performing such an operation, a pulse cessation period is identified at the place where the
hearing characteristic, for example, the sound quality, changes most at the time of phase
inversion, and good l! ! !
Phase EndPage: All phases of the phase of the 3-inversion circuit ? are switched to the one
where a feeling is obtained. Next, the M table 6 is adjusted to obtain a desired correction amount.
The ik unit 65 changes the amplitude of the delay signal, and as the amplitude of the delay signal
decreases, the peaks and valleys (concavities and convexities) of the comb-tooth characteristics
become flat. FIG. 7 shows, as the fifth embodiment, a sound field correction apparatus
constructed by using the circuit of the second embodiment shown in FIG. 6 in two stages. In FIG.
7, parts equivalent to those in FIG. 6 (6) are assigned the same reference numerals or
corresponding numbers in the 70's, and omission of explanation is omitted. In the circuit of FIG.
7, when the output terminal of the first stage adder is connected to one input terminal of the
second stage adder 76, the second stage phase inverting circuit 70, Delay circuit 71. It is
connected to the other input terminal of the above-mentioned addition * b 76 through a cell
attenuator 75. Also, the first stage, the second stage phase inversion same 60.70 is switched on
the switching side by the same switch switch ?, and the first stage, the second stage BBD
63.73? identical clock pulse generation 8 to 68 outputs It is driven by a pulse. Furthermore, a
table 65. 1 in the first stage, f # & 2 stages. Cloth interlocks with each other In this way, in a
single sheath constructed by cascading two or more stages of cross-tooth filters, as the number
of stages increases,! The peak width of the ill tooth profile is narrow, and the ridge of the valley is
wide. Usually, two stages are used to sufficiently compensate the transmission characteristics of
the ? sound field. The adjustment and the like are the same as those of the second embodiment
described above, and thus the description thereof is omitted. In addition, these 2nd. Also in the
case of the third embodiment, in order to make the peak value of the peak of the comb-like
characteristic constant, it is preferable to press-connect the frequency equalizer to either the
weight or position opening in FIG. preferable. As apparent from the above three embodiments,
according to the sound field correction device of the present invention, correction of the sound
field according to the room can be performed purely electronically, and the circuit used is also a
delay element such as BBD or COD. By using the above-mentioned, it is possible to construct a
specific soft sound easily, and in the case where the sound absorbing material is disposed in the
room as in the prior art, it is possible to obtain a very good hearing sound reproduction field at
low cost. In addition, it is highly practical value because it is easy to operate and it is easy to
operate. Note that the present invention is not limited to the BAFi and F5 embodiment only, and
for example, the upper # 1ll'5 embodiment shows the sound field correction apparatus using the
non-recursive horizontal filter, but the cyclic type It can be easily realized that a sound field
correction device is configured using a comb-tooth filter.
4. Brief Description of the Drawings FIG. 1 and FIG. 2 show two different basics of the 11 # IJ
tooth filter used in the present invention, block I! ??? Figure 1 is a block circuit diagram
showing the embodiment of @ 1 according to the present invention (Figure 4A, i 4 B, 1 and
characteristics for explaining the operation of the circuit of FIG. FIG. 6 shows a second
embodiment block 1111 !. FIG. 7 is a block wholesale inscription showing J & = i, FIG.
1, ..... late iA (b) road 2,20.21.22 ..... coefficient units 5,66,76 ... adder unit, 75 ... ииииии
Attenuator as a coefficient unit ? 1 area EndPage: ?
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