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[Industrial Lichuan Co., Ltd.] The present invention is a microphone device having an ambient
noise reduction effect, a sound leakage reduction effect of l \ other than the vicinity of a specific
target point in space. The present invention relates to a speaker device having a speaker device, a
loudspeaker communication device having an effect of anti-souggling effect on those two devices,
and a device for moving a target point of the devices in space. [Fj coming technology] like the jphone and intercom etc., it does not use Han 'I's cent, and the loud-speaking microphone with the
microphone 17 pong for transmitting and the receiver river speaker, in the 5 devices, it is
generally There is a problem. In other words, with the jM j +% river microphone and receiver
river speaker operating simultaneously, the rf connection between the microphone 1 ? ? +
pong speaker forms a loop circuit, and howling occurs at a frequency where the loop gain
exceeds 1 In such a communication device, while one transmission system is in operation, the
other transmission system 11Ji or decrease the transmission gain of the other transmission
system, so-called pushbull 1 иии Method (or howling-sub-renoser method) is known. [Problems to
be Solved by the Invention] However, in this method, two-way simultaneous loud-speaking jffi
talk is essentially impossible, and there are disadvantages such as the lack of smoothness of the
jffl talk. Also, in the conventional speech communication apparatus including this so-called
Pnoschbull talk system, in general, the ordinary telephone lll having a handset! The distance
between the microphone and the speaker, and the user's mouth) and the ear is large compared to
etc., so there were problems with the following (i) (mouth). (A) Increasing the sensitivity of the
microphone ? Because a need arises, it becomes easy for the microphone to pick up the
surrounding tone. (Mouth) Increase the volume of the speaker ? Because a need arises, the
sound may be noise to the surroundings other than the user! It is easy to be heard by the content
of the call. For these reasons, it has been difficult to use the loud speaker with a speaker, such as
an office, in places with a large number of entrances other than the user, and in places with large
ambient noise. In view of these problems, the present invention solves the above-mentioned
problem (i) by relatively increasing only the sensitivity to speech from a target point in the space
(mainly the head of the user) in Micro Hoshi Also, in the speaker, it is an object of the present
invention to solve the problem of the above (mouth) by relatively increasing only the sound
pressure at the target point and also to prevent the howling by both of them.
Also, in order for the present invention to function, the above target points must always be
aligned with the user's head. Therefore, the present invention further aims to freely move the
target point in the space by the user's will according to necessity. [Means for Solving the
Problems] The characteristics of the present invention make it possible for a plurality of users to
make calls using separate lines in the device 1 white of the present invention. In the following, let
m (m m 1) be the number of lines and users. First, means for solving the above problem (i) will be
described. FIG. 2 is a block diagram showing the configuration of the microphone device in the
device to which the present invention is applied. The n 1-1 (l ? ? ? ? ? ? 2) microphone
units 1-1, 1-2, ..., 1-n are installed in a fixed arrangement in the space. To the microphone unit 1-i
(1.ltoreq.i.ltoreq.0), mlll1 delays WS2i-1.2 + -2,-, 2-im are connected. The m target points in the
space 4-1. ????????????? A sound wave is converted into an electrical signal in
each microphone unit IS <1 ? i ? n). Next, this signal is delayed by time delay 1, 2-i-J. However,
Llj = TmaxJ-T. Let J be the time taken for the sound wave to reach the target point 4-J and the
microphone unit 1-i, and Tmax 4 is T,, T2,. , Tnj, or longer than, a certain length of time. ????
????????? ??????????????? T. j to TnJ, and hence tl, ~t ,, J, the target
point 4j and the microphone unit l. It is determined by the position in the space of -1. 1-21-n and
the acoustic environment of the pond. Delay 82-1-. j + 2-2 one j,. The signals output from 2-n-j
are added by the adder 3 j and output after being made into one signal. Next, means for solving
the problems of the above (mouth) will be described. FIG. 3 is a block diagram showing the
configuration of a speaker device of the devices according to the present invention. M target
points in the space 9-1. ???? . It is 9-m. 8-1. The n-2 (n ? 2) loudspeaker units 8-2, ..., 8-n
are installed in a fixed arrangement in the space. m input terminals 5-1. Among 5-2.5-m, the
input signal input to the input terminal '5-j (1 ? j ? m) is divided into n signals, and ?one delay
unit 6-1-j? is selected. .
6-2-J6-n-j. The signal input to the n spreader 6-i-j (11iin) is delayed by the time tij. ???
????????????? T ij is the time it takes the sound wave to reach the target point 9-j
from the speaker unit 8-1, T max J is those T ,,, T 2,. ... A time of a certain length, which is more
than all or most of TnJ. However, if T ? ax; <TH4, tlj = ?. These use the same symbols since the
microphone unit is replaced with the speaker unit and the sound wave traveling direction is
reversed, and the same effect as in the above microphone device is achieved by the,,, TI, and T
max 4. . Therefore, similarly to the microphone device, T1, to T14, and hence tlJ to tnj, are the
positions of the four points of the eye 9- "and the speaker unitot 8-1.8 to 2, 8 n in the sky 1m,
and Other ff e) Determined by M boundary. The {3} that has left the delay unit 6-ij (1 ? 1 ? 11)
is applied to the adders 7-l. 7-i,? 5 spread 266-i-1.6-i-2. , 6-i-m are applied, summed, and output
to sub-unit F3-L, where they are converted to sound waves. In the above, although both the
number of microphone units and the number of speaker units are n, this indicates that each unit
has a certain number of units, and it is necessary to combine the two to obtain one. When you do,
it does not necessarily indicate that the numbers in both lines should match. Rather, the RIM
values for the number of units in both IAWs are one of the most different, and it is desirable to
optimize each number. (The i & appropriate value will be determined by the required
performance and cost and other relationships for each device. Next, the means for determining
the set (t; j) of delay time of each delay in the above microphone device and speaker device will
be described. The target point for each line may be determined in advance and fixed. If it can be
determined that the user does not move very much, or if only the person at a certain position
should be the user, then this should be done. In addition, for a plurality of sets of target points, a
set of delay times (tHdk is obtained for each k in advance, and one k for each j is calculated as
necessary to obtain Itz) h as the delay time By switching the target point, you can use it.
Going further, it is possible to freely move the eyelid point during use by changing the delay
time. For example, it can be calculated and changed by micro processor etc. Where does the goal
change? In this case, there arises a problem of how to convert the user's good will into this set of
delay times. The following is a solution to the problem. From above Seki 1 system t lJ = TmaxJ-T
4, tIJf! : Determine TIJ. In addition, it is sufficient to actually know the difference between T + J
units from the childishness of Tiax 4. Ti is the time required for the sound wave to propagate
between the dot and each unitot. In order to determine TiJ with respect to a target point moving
in space in real time, sometimes it is sufficient to actually make a sound wave scatter by 1 and
measure the time from time to time. The present invention is that the sound signal emitted from
the target point is sent to each unit. The time taken to reach II or the relative noise between each
unitot in that time (the relative noise is actually transmitted between the target 4 and each unit
and the specific N that appears in the sound signal) Measure by focusing on the inter-features
and determine the delay time from this. The momentary feature in the sound {8 here is the
moment when it can be distinguished from other parts only from the information from the part
past that point on the time series of No.18. As a specific example, the impulse can generate the
impulse signal, the rising edge of the pulse signal, and the portion of the moment at which the
speech recognition device that produces an impulse signal when it recognizes a phoneme, J)
emits an impulse. In addition, one more, in real-time, audio signal input device, output an impulse
signal between vR input a particular part of the input signal sequence, and the "specific part" is
the same The part of tlft'jl from which an apparatus which is uniquely determined for the signal
sequence outputs an impulse signal can be said to be an instantaneous feature. There are two
directions for sound (two flags to propagate S to the target between each Unino 1-), and it is also
possible to separate each Uninot or measure all units at once. In the following, an apparatus will
be described which transmits sound waves from the target point toward the unit and determines
the delay time of all units at one time. The fourth [2 is a block diagram of the delay time
determiner. 10-1. ????? . 10-n are microphone units y + и installed in the vicinity of each
unit (microphone unit support / or speaker unit) for which delay time is to be determined.
These are not limited to ordinary audio frequency microphones, but may be ultrasonic
microphones, etc. First, in order to distinguish the elements that convert sound waves into
electric signals, and to distinguish them from the microphone units of the above microphone
device, It is called a wave unit. It is desirable to make the position relation system between each
uninoto of the device whose delay time is to be determined and the receiving uninot installed in
the vicinity thereof equal for all sets of units. + 6-1. ??????????????? It is
assumed that an acoustic signal including a specific inter-Pl feature 13j is emitted from the target
point 16-j. The special feature tnl3-j between w4 is assumed to be different for each j. A signal
discriminator 11-1 is connected to the received wave Unino llo-i. (No. 3 identification 311-i
outputs a control signal + 4-L-j to the timer 12 when identifying a specific instantaneous feature
+ 3-j (1 ? j ? m) in the signal. The timer 12 starts at a certain time from the time when the
control signal + 4-i-j is input, but at that time it does [4-IJ, + 4-2-J,-. 14-n-j 1 Measure the time
until the time when all or most of them are included, and output the delay time system {1 signal
15-i-j representing that time. In order to mount the delay time determiner in the abovementioned microphone device, each delivery unit to-i is disposed in the vicinity of the
microphone unit l-i, and the delay time control signal + 5-i-J of clocking 2:12 is provided. 21. The
delay time of the delay unit is changed according to the signal. The same applies to speakers. FIG.
1 is a bronok diagram of the communication device according to the invention, where m = 1. The
line number is omitted because m = 1. (For example, 2-1 examines 2-i-). The present invention
refers only to the control of the phase of the audio signal (delay), but does not disturb the signal
processing (amplitude amplification etc.) of the pond. For example, 1 и Lance-versal filter (FIR
filter etc.) may be used in place of the delay according to the present invention, although finer
signal processing can be performed, but the main part of the impulse response between the
target point and each uninoto It should be pointed out in particular that it is noted here that such
an apparatus for manipulating IP contains the lateral aspect of the invention in wood. [Operation]
The operation of the microphone device will be described. Eyebrows. ? T? j r r)) The t wave
reaches microphone unit l-i (1 ? 1 ?1) over time 'Fij min and f 11 is reached by delay unit 2 + j
and i j "-" After being delayed by lilX, Ti i enters the adder 3- ".
Therefore, (No. 1.4 of the target point which output target point 1- "(if ignoring the transmission
time of the electric signal and the operation time of the circuit)) is: In T; J + t City = T max N! t,
i.e., {Iz not 1} Add a constant time r: 2: 3 j to jl. Therefore, since the phases of the signals input to
the adders are all aligned, the signal from 4-J is output from the addition *>% with the amplitude
becoming rl f: 1 of the average of each input. On the other hand, signals from points other than 1- "are each microphone unit and / j! Since the time required to reach the adder 3- "through the
spreader depends on the most important route, the signals from the respective routes are added
to each other. Tend to weaken each other. Therefore, the output of this addition 23 3-j is t. The
sensitivity to l is enhanced relative to the sensitivity to other points. This effect is more
pronounced L Ц 1 as 0 is greater. Next, the operation of the speaker device will be described. The
signal input to the input 5-j (1 ? j ? m) is connected to n delay devices 6-i-j (i = 1. 2,-. The signal
is divided into r-) and input, and delayed by time J3-Tmax4-THi by the delay unit 6jj. The signal
from the delay device 6-i-J is superimposed on the signal from the j different system in the adder
71, converted into a sound wave in the speaker unit 8-i, and reaches the target point 9-j after
time TIJ. Do. Therefore, the signal input to the input terminal 5-J arrives at the target point 9-j
after the time T i4 + j ij = TaaxJ after being input regardless of which speaker 3 has passed. That
is, at this point, the phases of the signals derived from the input terminal 5-j are aligned.
Therefore, the amplitude of the signal is n ili i of the average of the amplitude of the signal from
each speaker unit due to interference. On the other hand, at points other than the target point 9j, since the phase of the signal from each speaker is somewhat shifted, the sound barrier of the
signal coming to the input terminal 5 'is relatively weakened by interference 5 The amplitude of
this signal at the target point 9-j is relatively large compared to the pond point. The effect is
more closed as n is larger. Since the whole system is linear, the above explanation holds for each
"by superposition on J". In addition, if a loudspeaker communication device is purchased using
this microphone device and the speaker device (with the above targets a4-j and 9- as the head of
the j-th user), the features of the two devices described above are obtained. Since the sensitivity
of the microphone device to the sound emitted from the speaker device is small, the howling
margin is improved as compared with the case of using the conventional microphone and
Next, the operation when the above-described delay time determiner is provided to the abovementioned microphone device and / or speaker device will be described. It is assumed that the
above-mentioned specific instantaneous hold ffll3-j is issued at time PJ from the target point 16-j
(1 ? j ? n). Then, time PJ + T. The signal discriminator 11-i discriminates the momentarily held
ml 3 j in J and sends a control signal 14-i-j to the timer 12. By the time PJ + TmaxJ I 14-1-j + 4-2". ??? All or most of the 14-Rono} are in the timer l2. Here, T IIaxi is a time with a certain
length, which is larger than all or most of t T + j + T 21 and T nj l. The timer 12 measures the
time (Ps + Tmaxj) -one (Pj + T + j) = TmaxjT from the time (Pj + T + j) at which each control signal
1 + 4?ij is input to the time Pi + T + aaxJ. Is measured and a delay time control signal 15-i-j
representing the time is sent to the microphone device and / or the delay device (2-i-j and / or
61- ") of the speaker device. Then, the time represented by 15-i-no should be used when the r: J
reference point (4-no and / 'or 9-J) is the target point (+ 6-j) of the delay time determiner. Delay
time for the microphone device and / or the speaker device. Thus, each time a momentary
feature 13- "is received, the j-th line of the microphone device and / or the speaker device is
corrected to be 16-j. EXAMPLES Some examples of the invention will now be described. Among
the components of each embodiment, the same reference numerals are used for those having
corresponding components in the description so far. (First Embodiment) A 511 is a block
diagram of an embodiment of a loudspeaker communication device according to the present
invention. This embodiment is characterized by three features that the wave receiving unit 10-i
of the delay time determination 2 is shared with the microphone unit 11 and the delay time is
determined by paying attention to a specific phoneme in the speech, and the whole is a digital
signal Horizontally constructed with processing unit. Also, the number m of lines and users is 1.
Therefore, the numbers that distinguish the lines are omitted. (For example, 2-i means 2-i1, T5
means Tll. The microphone unit 1-i and the speaker unit 8i (i = 1..2,-, r +) are arranged such that
the positional relationship between 1-i and 8-1 is the same regardless of i.
For example, if each speaker unit 8-i is installed 10 cm above the microphone unit 1-i, both the
microphone and the speaker SA of the same speaker are identical as described below. Since the
ml * lands, the target point of the speaker device is approximately lOcm above the target point of
the microphone device, due to the apparent invariance with respect to translation. This would be
an arrangement that is more suitable, for example, for speech communication ? than in the case
of upside down, due to the positional relationship between human mouth and ear. The
microphone device and the delay time determination t will be described. The voice of the user is]
-1. When it reaches the microphone unit of 1-2 и 1n, it is converted to an electrical signal. The
output signal of the microphone unit 1 is then A / D2 converted by an A / D converter IA-I,
divided into two, and sent to a delay element 2-1 and a signal discriminator 11-i. The signal
discriminator ll i is a speech recognition device that searches for a specific (one or more
constant) phoneme in the input signal. The phonemes are not continuous, but appear sufficiently
frequently in the conversation, for example, the sound of the "k" by the sound of the line or the
blindness of the "S" contained in the sound of the line. Choose. These can be divided by voice
recognition 'A'. During normal speech, these phonemes rarely appear at intervals of less than 0.1
seconds if II / 1. Therefore, it is assumed that the bottom of the phoneme interval is Ta. Signal
identification) ill-i sends the control signal 14-1 to the counter 18-1 at the moment when the
phoneme is separated. 18-1. 18-2, иии, l 8 r + is a counter capable of totaling time, and in addition
to the input from the engineering number A5 separate unit, a counter control signal to one
counter control device ... Have inputs and outputs. The state of the counter + at is divided into a
reception state and a standby state. Suppose that it is in the reception state at first. In the
reception state, control from signal 2 separate equipment i! When the I signal 14-i is received,
the counter 18-i starts counting time at the same time as sending the control signal 20-1 to the
counter control t1 device 19. The counter i1XI ljl device 19 starts counting time upon receipt of
the first one of the control signals 20-1 from the same side of the counter and at some time after
the lapse of In'r b counter III 1. 18-2,-. Send a count end signal to all of 18-n. Each counter 18-1
ends counting when it receives a count end signal, and a delay time control signal representing
the time from the time of the count 1-M, that is, the time of the control end signal 14-i5J3 to the
time of reception of the count end signal. 15-i to delay units 2-i and 6-i and at the same time
enter the waiting state.
The counter + 8-1, which has not received the control signal 14-1 by the time the count end
signal is received, sends a delay time control signal representing an infinite delay to the delay
units 2 bird and 6-i, that is send. The delay device receiving the blocking signal outputs 4111i
until the delay time control signal representing a finite time comes in, the counter control device
l9 starts counting the time again after sending the count end signal, and the time Tc After the
lapse of, send a reset / signal to all n counters. The counter 18-1 in the standby state ignores the
signal 14-1 from the signal discriminator 11-i, and is flanked in the receiving state by the reset
signal from the counter control unit 19 in this embodiment. + 8-1. A portion in which the counter
control device 119 is combined with 18-2.18-n corresponds to the gauge 12 described in the
section of [Seventh step for solving the problem]. As long as the reception time, and then staring
at the signal for a fixed time, f for some reason! Consider the case where the signal does not
reach all the passing uninotos {8, shut off the signal receiving 1 at a certain point, decide the
time to be delayed, output it, and ignore the signal reaching the passing uninot Evening. To that
end, Ta, Tb, and Tc are such that Tb is long enough for sound waves from the target point to
reach f'l to most delivery units, and Tb '"c is better than Ta. If rfAL, if the distance between the
Uninoto and the target point is several meters, then Tb can be about 0.01 seconds, so this
relationship is sufficiently feasible. On the other hand, 2-1 is a digital delay unit, which delays the
signal from the A / D'R converter 17-i according to the delay time control signal 15-i, and
outputs it to the adder 3. Delay device 21. ??? -. The signal from 2-n is converted to an analog
line No. 13 by the D / A converter 21 and is sent to the other party of the call as the output of
this unit. At this time, the user's voice is added simultaneously regardless of which micro-pong
uninoto passes; in order to reach 1 to 3, signals from the respective paths interfere with each
other to strengthen each other, and as a result, the microphone 9i The sensitivity to the voice of
use n is better than the sensitivity to a voice from the point of the pond. Next, the speaker device
will be described. A human power signal, that is, a voice signal from the other party of the call, is
input from the input 5 and is digitized by the A / D ? RPA unit 22 and divided into n signals to
obtain 6-1.
6-2.6- [I enter one delay unit. Delay device 6-i (i = 1. ?? -. N) is a digital delay unit, which delays
the digital voice signal according to the delay time equalizing signal 15-1 and then sends it to the
D / A converter IA-l. The signal is converted to an analog signal by the D / A converter 23-i and
output as sound from the speaker unit 8-1. ????????????? The sound waves
output from 8-2 and 8-11 reach Dari's head over a certain period of time, but Dari reaches Dari's
head. It is constant regardless of the speaker unit. Thus, due to interference, the rf pressure in
the vicinity of the user's head will be relatively thicker than to the pond where the same signal
will arrive at different times. Second Embodiment In the first embodiment described above, there
is a risk of causing a malfunction 3 in which if the voice of a person other than the user is
nearby, the target point will be left there! ), So it can not be used in a room with many people
around. In order to use the inventive calling device in a room with many other people, such as an
office, for example, the device must be given information of who is the user. Also in the first
embodiment, the signal identifier 11-i is simply 4? Not only can you identify a certain phoneme,
but you can also make it possible to divide the specific huge voice into three, you can set the
point where the person's voice is emitted as a target point, even in an office etc. It becomes
possible. On the other hand, there is also the following method. In the following, as a second
embodiment of the present invention, a system in which a user has an ultrasonic transmitter and
a target point is determined by a signal emitted from the ultrasonic transmitter will be described.
The audio signal system of this embodiment, that is, the speaker unit 8-i, the microphone unit 1-i.
The delay units 2-1 and 5-i, the adder 3, the A / D or D / A conversion 2 17-1, 23-1, 21 and 22
are all the same as in the first embodiment, and therefore, will be described in duplicate. Omitted.
Also, the time of each four appearing in the following description has the same meaning as the
above description. The main difference from the first embodiment is that the delay time
determiner uses an ultrasonic wave. When deciding on the communication device of the present
embodiment, the user has a transmitter 24 for emitting an appropriately encoded ultrasonic
signal at a constant time interval. At present, since such a transmitter can be made very small, the
transmitter 24 is installed near the user's head, for example, by putting it on a badge and putting
it on clothes.
On the side of the main body, the speaker unit 8 l and / or the microphone unit 1-1 and the
delivery unit 10-1 are disposed in the same positional relationship for each one. By setting this
positional relationship well, it is not necessary to make the position of the transmitter identical
with the target point. For example, if the transmitter 24 is attached to the chest of the user, only
the delivery unit should be located several tens cm below the same j speaker unit and / or
microphone unit. Then, the target point of the communication device is several centimeters
above the transmitter near the prefecture. That is, it is near the head of the user. The state of the
timepiece l2 of this practical example is roughly divided into a reception state and a standby
state. The operation of the reception state is explained. Below, please read Fig. 1 while tq. A
sound wave emitted from the transmitter first reaches II +, ie, a delivery unit closest to the
transmitter is 10k (1 ? k ? n), and instantaneous n characteristics, ie, the above ultrasonic
signal is transmitted from the transmitter at time P Suppose that it was emitted. Then, at time P +
T, the signal discriminator 11k first discriminates the part, and sends it to the control 01 signal
14-k = timer 12. Here, T (i = 1.2 n) is the time required for the sound wave to reach the receiving
unit 10-i from the target point. The timer 12 starts timing when it receives the control 1.1 signal
14-k. Thereafter, for each 1 (1.ltoreq.i.ltoreq.R), time P + Ti is No.13, leakage 2S1 1 is used to
identify ultrasonic signals, and a ?1 m signal 14-i is sent to the timer l2. The timer 12 is a time
(P + Tk + Tb) at a time (P + Tk ? Tb) i of a constant time after receiving the most significant
signal 14-k from 1l received each control l3f signal 14-if. -(P ? Ti) = Tk + Tb?Titf Measure and
send a signal 15-i'r representing this time to the microphone device ? and / or the delay device
2-1 and / or 6-1 of the speaker device immediately. For l which has not received the control
signal 14 by this time, it sends to the delay unit a delay control signal representing an infinite
delay, ie a blocking signal. The delay device receiving the blocking signal shuts off the output
until a delay time control signal for covering a finite time is input. After outputting the delay time
limiting signal, the timer 2:12 immediately enters the waiting state and ignores the input signal
during the constant closing Tc. Then timer 12? And return to the reception state, TIIax = Tk-1-Tb,
and each 15-1 k time TkTTb T i has # # inter-features received by time P + Tk ? Tb ? A few it
did not reach tl + to Iol!
-Except for the microphone base and / or the speaker base that should be used just when the
head of the common head is used as a benchmark: the delay time t1 for n, and the target points
of the microphone device and the speaker device are corrected Such timekeeping 2; 12 can be
easily transposed with digital circulation. Also, using a microprocessor, it is possible to program
the motions described above. In this example, the received wave UNISOTO 10- i t! -The signal
discriminator 11-i may be a relatively simple signal reception circuit, since it is an ultrasonic
microphone and the delay time is determined by receiving the Li? wave signal emitted from the
transmitter 24 at each 10-i, Low cost 1-year and more reliable fluctuation are expected. In
addition, even in a room with many people in the pond, one boat can be used. << Embodiment 4
>> In the present invention, a plurality of microphones or loudspeakers, a delay device, a signal
discriminator, etc. are used, but peripheral fi noise reduction, acoustic leakage reduction to the
surroundings, and acoustic leakage reduction, which are features of the present invention, The
effectiveness of howling prevention is by the number of Uninots, but by writing. That is, in order
to achieve a certain level of performance, a large number of units 1, delay units, signal
identification units, etc. are required. But using them in large numbers is just as costly. Although
it is relatively easy to reduce the cost by integration etc., it is relatively difficult for the
microphone and the speaker unitot to do so. In addition, when using a large number of
communication devices according to the present invention in the same room such as an office, it
is inconvenient because the number of microphones and speaker units is large. In the present
invention, when using a large number of lines in the same room, it is possible to make a call
independently on a plurality of lines only by increasing the number m of lines used in the above
description. In other words, when using multiple m = 1 devices, it is possible to share
microphones, speakers and receive units. This is an excellent property of the present invention
utilizing the linearity of the system. The following describes implementation rs3. The unit is
placed over the entire ceiling of the room by increasing m of the see-through device of the
second embodiment. If you are in the room and you are likely to make a call, put a transmitter on
your clothes, for example, and switch on the transmitter if you need to make a call. The encoding
method is made to be different for each transmitter, and the communication device is activated
by the super-sound application signal having a specific code 1 generated from the transmitter 2
and assigns a line to each different code.
By doing this, a plurality of users can move in the room and talk on different lines. It is also
possible to have people in the same room talk with each other. [Effect of the Invention] By the
above constitution, the present invention has the following effects. a) The microphone device
receives the sound by a plurality of microphone units, delays the signal from unit to unit so that
the phase of the signal from a specific target point in space is aligned, and adds the sensitivity to
the target point. It can be made relatively better than the sensitivity to the point of. b) The
speaker device delays the signal to the plurality of speaker units from one unit to another so that
the sound pressure at the target point can be adjusted to another point by delaying the signals to
the plurality of speaker units so that the signals are in phase at a specific point in space. It can be
relatively larger than Otoe. C) The loudspeaker communication equipment equipped with these
microphones and loudspeakers, due to the nature of each of the above-mentioned devices, is less
likely to pick up noise from the surrounding area, and is less likely to be a noise relative to the
surrounding area. It is hard to hear. In addition, since the sensitivity of the microphone device to
the signal output from the speaker device is small, the howling margin is improved as compared
with the case where the conventional microphone and speaker are used. d) i! ! In the delay time
determiner, the difference between the time taken for the sound wave to propagate in the target
point and each Unino 1 ?, or between each Uninoto of the time, In practice, it is possible to move
the target device of the microphone device or the speaker device or the speech communication
device in real time by measuring the delay time from this by determining the delay time from
this. e> In particular, the target point can be always aligned with the head of the toilet by the
delay time t and the fixed number 2; f) voice recognition application f. By setting it as 2, a
plurality of people for gullets can make separate calls while moving through the room.
Brief description of the drawings
The first (21 is a speech apparatus according to the present invention, equipped with a d delay
time determiner, and showing a configuration of one with m = 1.
Fig. 2 [2I, Fig. 3 and Fig. 4 are block diagrams showing the ellipticity of the microphone device,
the speaker device, and the delay time determiner of the present invention respectively. The fifth
I21 is a Brnok diagram of an embodiment of the present invention. ???? ???? ..., 1
Microphone unit, 2-i, 2-i-j (i = 1. 2r +; j = 1. 2, ?, m) delay unit. ?? ???????? -. 3-m:
Adder. ?? 5-1. 52... 5- 1 n: input terminal, 6-it 6-i-j (i = 1, 2,-, n; j = 1. 2,-, m) delay device. 7-1. 72, ..., 7-o adder. 8-! . ??????????????????? ????? ????? ... 10-
Reception unit 7. 11-1. ????? ?? II-n: Signal processing equipment. 12 clock: 14-i, 14-i-j (i
= 1.2,... N: j = 1.2, -.m): control signals. 15-i15-i-j (i = 1.2, n1 j = 1.2 m) delay time control signal.
17- 1. 17-217-n: A / D converter. 18-1, IL-2.18-n Counter. 19 Counter controller. 20-1. 20-2, ...,
201 control signal. 21 D / A conversion 2 22, A / D converter. ????? 23-2.23 '-n: D / A g:
converter. 'P1 revised applicant Hiroaki Ishikawa 1 g
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