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JPS557765

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DESCRIPTION JPS557765
Renaming 1, name of the invention sound field regulator (11 voice to be measured is converted
into an electrical signal having a level and frequency corresponding to the voice in the input
signal circuit, and the electrical signal is frequency banded in a band-pass filter And separate the
electric signal separated for each frequency into multi-bit, soto-digital signals by an A-D
converter, and control the frequency characteristics of the equalizer by the multi-bit digital
signals. And the sound field adjuster.
2, the scope of claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sound field
adjuster which measures the sound field in a room and enables automatic control of the
frequency characteristics of the equalizer by means of the measured signal. There are various
ones that measure the sound field in the room even now. However, these only detect the sound of
the sound field as an analog signal and operate the meter until only the frequency characteristic
of the sound field at that time can be completely known, and adjustment of the frequency
characteristic of the equalizer has to be performed manually did not become. The present
invention automatically converts the frequency characteristic of the equalizer into the seven
measurement results by converting the analog signal obtained by measuring the frequency
characteristic of the sound field into a digital / I / signal, in particular. The present invention
relates to a sound field adjuster that is designed to The present invention will be described below
with reference to the drawings. (1) is a microphone for collecting the sound of the sound field in
the room and converting it into an electric signal, t2a + (2o) иии и и и и и и и и и large through the
amplifier (3) on the output side of the microphone (1) Bandpass filters connected in parallel (4a3
(4D)... Absolute fX'M flow '113 JWr (5a) (5D)... .. And a switching circuit (7a) (70)..., The band
pass filter (4a) is an operational amplifier (8) (9) ? O and these operational amplifiers +81 as
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shown in FIG. (9) A resistor and a capacitor of fC number up to 0 are connected to one another
and the pass band frequency is largely different. An example of the passband frequency of each
band pass filter is as follows. EndPage: 1 pass frequency pandopa y, y il pt4a) 31.5 Hz "(4 kl +
66.0 ttttt (40) 125.0 // lt (4 d + 250.0" ttt 4 e) 500. Otl // (4f) IKHz "(4gl'ltt" L4h + 4ttttt41) 8 ""
(4k) 16tt Also, the absolute value rectification circuit (5a) is composed of an op amp 1G11 and a
diode a2a3, and a low bus filter (6a) is an operational amplifier ? And ?? and a resistor ? ?
and a capacitor ? Q connected to the output side of the operational amplifier ??. .. Are applied
to the gates of the switching circuits t7a) t7b)... As shown in FIG. 6, and the switching circuit (7a)
is added. ) (7D)... Periodically open sequentially. .alpha..eta. is an A-7 D conversion circuit
commonly connected to the series circuit (2al (2D)...), and as shown in FIG. 3, a large number of
operational amplifiers (18a H 18b). And the input terminals of the operational amplifiers 18a,
18D,... Are connected to the series circuit (2aH2o)... The other input terminal is connected to a
level setting resistor (21 at (2111)... Via a resistor fW (22 a H 22 t)).
The mouth is a serial-to-barrel conversion circuit, which converts the serial signal into a parallel
signal. ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Decoder for distributing the converted respective
parallel signals according to their magnitudes, It is a Nui Fuchi group having a switch 9a (26a1)
(26a2)... (FIG. 4) turned on. The switch group (25 a) (25 D) ? ? ? ? is incorporated in the
equalizer t 27 a> (27 ? or ? (FIG. 5) and passes each equalizer (27 al (271)). Control levels. An
embodiment of one of the equalizers c27a) t27o)... Is shown in FIG. 4 as a resonant circuit having
the same passband frequency as the band pass filter 4a. 28a), resistance (29a) (29D). The
equalizers 27a, 27b,... Are connected in parallel between the preamplifier 6!) And the main
amplifier Q via an operational amplifier as shown in FIG. Incidentally, the switch (26aO) is for
automatic switching. When the switch (26ao> is turned on) f, the attenuation degree of the
equalizer is changed by switching manually. Next, the operation of the present invention will be
described. Now put the microphone (IJf: in place to measure the sound field. In such a state,
when the tape on which pink noise is recorded is played and the speaker is driven, the sound is
collected by the microphone (1)! It is converted to a complete signal. The electric signal is
amplified by the amplifier (31 and then supplied to the immediately outside W & (2a) (2DJ.... In
the series circuit t2a) t2b)... First, the electric signal is separated for each frequency by the band
pass filter r4a (4b). For example, the band pass filter (4a) passes only the electric signal near
31.5 Hz, and the band pass filter (4h) passes the electric signal near 16 KHz. In this manner, the
signals separated for each frequency are rectified by the absolute value rectification circuit (5a3
(5D)... And then low pass filtered (6al (601. Make it a DC smooth signal corresponding to the
signal level of i & number. The DC smoothed signal is applied to the switch, footing circuit (7a,
70),..., But the switch, notching circuit, 7a, 7D,. Since one period f1rU turns on sequentially, the
DC smoothed signal is observed in the 8-D conversion circuit .sigma..eta.
Therefore, a series of serial signals obtained by dividing the DC smoothed signal obtained by
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each series circuit (2a) (2D,...) Into a fixed length is supplied to the A-Df conversion circuit ? ?
?. The serial signal is added to one terminal of the operational amplifier (18 au 18 b +...) Of the
A-D conversion circuit ??. On the other hand, since the other terminals of the operational
amplifiers (18a) (18b)... Are set in level by the resistors (21a) (21b). Different from the
operational amplifier t18a) t18bt. That is, when there is no serial signal but very small, only the
output of the operational amplifier (18h) becomes high level, but when the serial signal becomes
larger, the output of the operational amplifier EndPage: 2 (13h) (18g) becomes high level, When
the signal becomes the largest, the outputs of all the operational amplifiers N8nu18g)... Become
high level. Therefore, a step wave signal according to the magnitude of the serial signal is output
from the operational amplifier (18aH18D). The step wave signal is converted into a 6-bit digital
signal according to the magnitude by the multi-bit sodogram p signal generation circuit ?9.
Since the 6-bit digital signal is a continuous serial signal for each bit, it is converted into a
parallel signal by the serial blur / I / reverting circuit. The converted parallel signal is divided by
WRv according to the magnitude of the 6-bit soto digital signal by the decoder t24a t24b). The
distributed signal is a sweet J thousand #t 25a] C 250)----------------(26a? ???????????
???? Now, the bandpass filter t4a) t-the frequency of the ebb of the transmitted acoustic
signal is weak and the ninth signal from the decoder (24a) is the switch L26a9)? ??????
Then a resistor-and a switch (the low frequency component in the vicinity of 31.5 H2 of the
audio signal from the ali amplifier 0? is enhanced and added to the main amplifier) because the
maximum feedback signal is added to the equalizer (27a) via 26a9J Be Also, the level of the low
frequency portion of the acoustic signal passed through the band pass filter (4a) is large, and the
first signal from the decoder t24a) turns on the switch tz6a1). Then, at this time, the 31.5 Hz
audio signal added to the main amplifier (a) by the ali amplifier OJI is observed in the resonant
circuit (28a) via the Sui Sochi (26a eye), and the common * circuit (28a) It is attenuated because
it is bused.
Such a thing is performed for each equalizer (27a) (27D)... By measuring the frequency
component of the sound field in the room, and eventually the frequency characteristic of the
sound field can be made entirely flat. Since the sound field adjuster of the present invention
measures the frequency components of the sound field and controls the frequency characteristics
of the equalizer with the digital signal obtained by the measurement, the frequency components
of the sound field are always optimized. it can.
4, Brief description of the drawings 2, 6 and 4 are circuit diagrams showing an embodiment of
each part of the present invention, and FIG. 5 is a waveform chart of a sequence pulse signal
used in the present invention. (1)... Microphone (2a) (20). ??
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Decoder (25a) t25'oJ ииииии и
Watery group t27h> <27o>----Equalizer Patent applicant alternative planner Ikei 4. L No., Knee 1
person End Page: 3 FIG. 4 5th Procedure Amendment (Method) 1, Display of the Case Showa
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Patent No. 80800 No. 2, Invention Name 2, Invention Name Sound Field-@ Machine Those who
make corrections Patent applicant address Moriguchi type Keihanhondori 2 lower eyes 18
address Contact: Telephone (Tokyo) 835-1111 Patent Center Representative Shibata 4, Date of
correction instruction C delivery date) September 26, 1976 Day 5, column 6 of ?Description of
the drawing? in the specification subject to correction, self-answered statement 0 supplement 9
?Negative line 2? ?FIG. 4? After ?5? . rO Specification No. 9 negative third line "Fig. 5" is
corrected to "Fig. 6". End of 1 page EndPage: 5 Warning: Page Discontinuity
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