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Specification king [name of invention]
Sound collection method in a closed space and apparatus for storing the method
[Detailed Description of the Invention] The present invention relates to a sound collecting
technology in a large hall, room or the like where a meeting is held, such as a meeting or a
parliament. The present invention is characterized in that the content of the participants in the
conference can be appropriately switched so that the reproduced sound is amplified at a desired
listening position in the room to a greater extent than the other positions in the room. There are
various problems with sound collection performed for acoustic amplification in a room such as a
conference room etc. 2 In particular, there is a defect that a large conference room where
participants are waiting for an opportunity to speak may be lacking in assistants . When the
speaker is an important person, it is not inconvenient since the speaker can be heard using an
appropriate sound collecting means generally at the podium or chairperson. However, when it
comes to the stage to request a speaker to speak, if the special sound amplification means can
not be used in a timely manner, the content of the speech is often overwhelmed by the
conversation or surrounding noise and can not be heard. So far there has been no solution other
than asking the speaker to go to the desk with the microphone attached or to bring the mobile
microphone to the speaker. However, both solutions are time consuming and disadvantageous
for meeting progress. On the other hand, arranging the microphones for each seat of the
participant requires connecting all the microphones individually to a general purpose sound
amplification device, thus requiring a large outlay for expensive equipment. It will be. . The
present invention amplifies the speech of participants present in the room in a fixed manner
while at the same time relatively attenuates the speech generated anywhere in the same room, in
which case the participants stand up and the microphone It is unnecessary to move this speaker's
place. Furthermore, the present invention is characterized in that the acoustic equipment is not
so expensive because only a predetermined number of microphones are used. To further
comment, the present invention installs a predetermined number of microphones in a closed
space such as a meeting room or a large venue where a meeting or a meeting is held, and
provides a listening position such as a large number of seats to attendees. The method relates to
the sound collection method in a certain space, and the relative phase difference (phase shift) of
the sound collected by all the microphones as the sound source responds to each of the abovementioned listening positions for each listening position And storing the phases of the plurality
of electrical signals generated by the plurality of microphones, the plurality of electrical signals
representing sounds generated at a particular listening position of at least one of the speaking
participants Selecting the phase-shifted electrical signal to be in phase with the phase-shifted
electrical signal, phase summing all the phase-shifted electrical signals, and thus the electrical
signal produced by the addition. It is obtained by realizing the fern sound collection method as
applied to the No. amplifying means.
The present invention also relates to a plurality of microphones disposed at specific installation
positions in a closed space such as a hall or a room, a plurality of input units connected to these
microphones, and at least a part of the same number of output units. A phase shifter, the phase
shifter comprising means for respectively delaying a plurality of electrical signals applied to the
input to an adjustable value, each at a specific listening position inside a chamber or the like A
storage unit for storing a series of values of each phase difference corresponding to each as
programmed in advance, a sound generation apparatus configured to control the delay means by
inputting the series of phase difference values selected from the phase shifters, A room sound
collecting apparatus comprising at least-addition circuits, each input unit of which has the same
number of inputs as the output units of the phase shifters, each input unit being connected to the
output unit of the phase shifters. It is a thing. The configuration and function of EndPage: 2 will
be described below in accordance with the attached drawing regarding one embodiment of the
present invention. As shown in Fig. 1, in the meeting room or parliament room 11 there is a
seating area for participants, a chair's table 12 and a seating area F for participants in more
important positions behind them are provided as usual. ing. The table 12 is provided with a
plurality of microphones (not shown) provided to the participants sitting on the seat F, but this is
not directly relevant to the present invention. In the audio amplification room 16 adjacent to the
room 11, the component parts of the device according to the invention are arranged intensively
together with a flashing call board etc. and if any one of the participants in the seat f wants to
speak Advantageously, a desk 18 is provided to be displayed. This type of call board is
conventional. On the other hand, in the present invention, a small number of microphones (for
example, four MlrMleMB + M4) are disposed at a large distance from one another as
microphones that collect all the sound in the room. As shown in FIG. 2, the microphones M, -M4
are connected at the corresponding input el-e'4 VC of the phase shifter. This phase shifter is
controlled in such a manner that all of the storage unit 15 is connected to the output unit S of the
speech device 14 and the data input unit of the phaser according to the stored data. It is
connected. The output S, -8, of this phase shifter is connected to the corresponding input e'1 e'4
of the summing circuit A, the output S 'of which is, for example, an acoustic signal comprising an
amplifier 16 and one or more loudspeakers 17. Connected to the amplifier. The entire structure
schematically shown in FIG. 2 is accommodated in the compartment 16 except for the 74
crophone Ml-M, and the loudspeaker 17 is installed in the conference hall 11.
While the conference room is in use, the storage unit 15 is preprogrammed as a whole. For each
listening position f corresponding to the participant's seat, the relative phase difference of each
sound collected by the microphones M and M when the sound source is at a predetermined
position (for example, the seat f1) is measured and . FIG. 6 shows that the components of the
audio signal corresponding to the sound generated at the position f1 are collected by the four
microphones M and -M4. As for the component reaching the microphone M1 (the delay is
maximum), this voice component is advanced t to the microphone M2! Also, the microphone M8
reaches the microphone M4 at the leading phase t8 at the leading phase t4. As a result, when
programming the storage unit 15 for the position f, the value of the phase difference t!
Corresponding to the microphone J, M1 M4. pt8 + t4 is stored under the reference microphone
Ml. A similar procedure takes the microphone with the largest time delay as the reference
microphone, ie the microphone farthest away from the position f generally considered, with
respect to this reference microphone the sound collected by the other microphones The relative
phase difference value is recorded in the storage unit 15. As a second approximation, the
recorded time delay between the speech at a given position f and the listening content by the
microphones Ml-M4 depends on each remote distance of the microphone relative to the position
f. The system is enabled when the storage valve 15 is programmed as described above. When the
participant in the seat f asks to speak, the operator in the small room 1 executes the selection
step by the atriging device 14, and as a result, the storage unit 15 causes the value of the
microphone M, t2 + tlltt4, to be a phase shifter. Transmit The function of the phase shifter delays
the sound collected by the microphone M2 by time t2, delays the sound collected by the
microphone M8 by time t8, and further delays the sound collected by the microphone M4 by
time t4. It is to The sound components collected by the microphones Ml-M are all in phase when
expressing the sound emitted from the position f1 (FIG. 4). Thus, summing circuit A, which
receives the signals from microphones Ml-M4 via phase shifters, amplifies the above-mentioned
components of the electrical signal representing the sound emitted at position f1. In other words,
f. The voices emitted by are summed so as to be amplified by a factor of 4 (the number of
microphones) and the voice components emitted everywhere in the room are added algebraically
to each other, thus this amplifying device is undesirable voice or specific At position f, only
background noise that is not amplified like the sound emitted at is transmitted.
By making the addressing device 14 work, the reference microphone and phase difference value
EndPage: 3 are changed according to the other listeners' corresponding listening positions f, and
the speech at this new position is It can be done properly. Furthermore, the device shown in FIG.
2 can be easily modified to select sound collection from two or more identified locations. For this
purpose, it is sufficient to double the circuit of the phase shifter and to provide two adders such
as A, for example, and to connect each output to the same voice amplification means. Of course,
the storage unit 15 can simultaneously supply two groups of data to the phase shifter. In
addition, in some cases, the above choices can be canceled by selecting the push button at each
participant and using them in their own hands and pressing the same button or another button. .
The system according to the invention is also applicable to simultaneous interpretation. In this
case, the loudspeakers are replaced with individual earphones, and the speech of a specific
participant is translated and transmitted by an interpreter.
4. Brief description of the drawings] FIG. 1 is a block diagram of a sound collecting apparatus
installed in a conference room, and FIG. 6 is collected by a microphone in the room. Diagram of
multiple signal components representing the sound generated from a specific listening position,
Fig. 4 is a diagram of the audio component at the output of the phase shifter, and Fig. 5 is an
addition circuit with the component shown in Fig. 4 as an input. It is a diagram of the signal
which appears on the output side. fl, f, F ... seat, 11 ... room, M1 + M! tM8 vM4: microphone, D:
phase shifter, A: adder, 15: storage unit, 14: address signal device, 17: loudspeaker, 16: amplifier.
Patent Assignee Hernall Charles Le Q-14 Attorney Attorney Yuasa Yusan J, Fu (2 persons)
EndPage: 4