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JP2010074827

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2010074827
The present invention provides a recording and reproduction apparatus capable of intuitively
selecting a reproduction channel based on the seating position of a participant of a conference.
SOLUTION: Three microphones 12a, 12b and 12c are provided at intervals of 120 degrees in
order to pick up voices of the entire circumference. The audio collected by each microphone is
recorded in parallel on three channels. At the time of reproduction, in the normal mode, the
audio of three channels is read out and reproduced in parallel. In the direction specification
mode, only the channel in the specified direction is read out and reproduced. At this time, since
the direction specification buttons 15-1 to 15-6 are arranged around the microphone, to select
the playback channel, press the direction specification button based on the seating position of
the conference participant at the time of recording (during a conference) Intuitive choices are
possible. [Selected figure] Figure 1
Recording and playback device
[0001]
The present invention relates to a recording and reproducing apparatus for collecting, recording
and reproducing voices coming from a plurality of directions, such as speech of a conference or
the like.
[0002]
It is common practice to record the speech of the conference and then replay and confirm this
recording.
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1
Since a conference is a conference where a plurality of conference participants speak from their
respective seating positions, voices collected by a plurality of microphones are different from one
another using a multi-track (multi-channel) recorder like the device of Patent Document 1
Recording on a track (channel) is also conceivable.
[0003]
Japanese Patent Laid-Open No. 2002-050161
[0004]
Although the recording of the conference recorded by such a recording device is reproduced
after the end of the conference, it may be desired to confirm the speech of a specific conference
participant instead of listening through the speech of all the members.
However, in the multi-track recorder of the above configuration, it is unclear on which track the
speech of the desired conference participant is recorded, and it is not possible to intuitively know
this. There is a problem that it is necessary to search for a track on which the remarks of the
conference participant are recorded.
[0005]
An object of the present invention is to provide a recording and reproducing apparatus capable
of intuitively selecting a reproduction track (channel) based on the seating position of a
participant of a conference.
[0006]
The recording and reproducing apparatus according to the invention of claim 1 comprises a
plurality of sound collecting units having directional characteristics in different directions, and a
recording unit for recording in parallel a plurality of audio signals collected by the plurality of
sound collecting units. A plurality of direction specifying operators provided at positions
indicating different directions, and a reproduction unit for reading out an audio signal stored in
the recording unit, wherein the direction is not specified by the operation of the direction
specifying operators. A plurality of audio signals are read in parallel, and when the direction is
designated by the operation of the direction designation operator, only the audio signal picked
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2
up by the sound collection unit having directional characteristics in the designated direction is
read and reproduced. And a reproduction unit.
[0007]
When the recording and reproducing apparatus of the present invention is used for recording a
conference, it is considered that the recording and reproducing apparatus is installed at the
center of the conference console, and a conference participant is seated around the conference
console.
At the time of recording, the recording and reproduction apparatus records in parallel the sound
collected by the plurality of sound collection units having directivity characteristics in different
directions.
That is, the voices of all the conference participants are recorded by multi-channel.
[0008]
At the time of reproduction, when the direction is not designated (in the normal mode), the
recording and reproduction apparatus reads the sound of all the channels and reproduces the
sound of the entire conference. On the other hand, when the direction is designated (direction
designation mode), only the sound picked up by the sound pickup unit having the directional
characteristic in the designated direction is read and reproduced. This makes it possible to
confirm only the remarks of the participant seated in that direction.
[0009]
In this case, by providing a direction designating operator for designating the direction at a
position for designating the sound collecting direction around the device, it is possible to
intuitively select the participant. That is, it is possible to reproduce the participant's remarks by
remembering the direction in which the participant is seated with respect to this device and
operating the direction specifying operation element for instructing the direction. There is no
need for electronic operations such as selection of recording channels.
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[0010]
According to the invention of claim 2, in the invention of claim 1, when there are no sound
pickup units having directivity characteristics in the direction designated by the direction
designation operation element, the reproduction unit holds a plurality of the designated
directions. The present invention is characterized in that audio signals collected by a plurality of
sound collection units having directional characteristics in a direction are read out and
synthesized. This makes it possible to reproduce collected sound at many small angles with a
small number of sound collection units.
[0011]
The invention of claim 3 is the invention according to claims 1 and 2, wherein the plurality of
sound collection units are a plurality of unidirectional microphones arranged in the normal
direction at a predetermined middle angle on a predetermined circumference. The plurality of
direction designation operators are disposed around the plurality of unidirectional microphones.
[0012]
By arranging the direction specification operators around the sound collection unit in this way, it
is possible to intuitively tell which direction each direction specification operator indicates.
[0013]
The invention according to claim 4 further comprises an arm rotatable relative to the apparatus
main body according to the invention according to claims 1 and 2, and a part of the plurality of
sound collection units and a plurality of direction specification operators. A part is provided in
the arm.
[0014]
In the invention according to claim 4, further comprising an angle sensor for detecting an angle
between the apparatus main body and the arm, and the recording unit stores a detection value of
the angle sensor at the time of recording an audio signal as a recording angle. The apparatus may
further comprise warning means for comparing the detection value of the angle sensor with the
recording angle at the time of reproduction by the reproduction unit, and giving a warning if the
comparison result is not identical.
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[0015]
According to the present invention, by providing a plurality of direction specifying operators
which indicate different directions, it is possible to intuitively select a participant who wants to
reproduce a message.
That is, it is possible to reproduce the participant's remarks by remembering in which direction
the participant is seated with respect to this device and operating the direction specification
operation element for specifying the direction. There is no need for electronic operations such as
selection of recording channels.
[0016]
The external view of the recording and reproducing apparatus according to the embodiment of
the present invention. The block diagram of the recording and reproducing apparatus. An
example of usage of the recording and reproducing apparatus and a diagram showing an
example of the recording form. 2 is an external view of the recording and reproducing apparatus
according to the second embodiment, and a block diagram of the recording and reproducing
apparatus.
[0017]
A recording and reproducing apparatus according to an embodiment of the present invention will
be described with reference to the drawings.
FIG. 1A is an external perspective view of a recording and reproducing apparatus according to an
embodiment of the present invention.
Also, FIG. 6B is a diagram showing the directivity characteristics of the microphones 12a, 12b,
12c installed in the same recording / reproducing apparatus.
[0018]
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5
The recording / reproducing apparatus 1 has a rectangular parallelepiped housing 10 having a
low height, and has a cylindrical sound pickup tower 11 at the center of the upper surface of the
housing 10.
A speaker 14 is provided on one side 10 a of the housing 10.
In the following description, the direction of the side surface 10a on which the speaker 14 is
provided is taken as the front direction.
[0019]
Three microphones 12a, 12b and 12c are provided on the side of the sound collection tower 11
at intervals of 120 degrees. The microphone 12 a is provided in the front direction of the sound
collection tower 11. The microphone 12 b is provided in the direction of 120 degrees right from
the front direction of the sound collection tower 11. Further, the microphone 12 c is provided in
the direction of 120 degrees left from the front direction of the sound collection tower 11. Each
of the microphones 12a, 12b and 12c is a unidirectional microphone and is installed in a
direction (normal direction) perpendicular to the central axis of the sound collection tower 11,
and a solid line circle 120a of FIG. It has directivity characteristics as shown by 120b and 120c.
A circle 120a represents the directivity of the microphone 12a, a circle 120b represents the
directivity of the microphone 12b, and a circle 120c represents the directivity of the microphone
12c. As shown in this figure, each microphone 12 has the maximum sensitivity in the front
direction of the microphone, the sensitivity decreases as the angle from the front becomes
deeper, and the sensitivity is 0 at the side (the angle from the front is 90 degrees) become.
[0020]
Of the audio signals collected by the three microphones 12a, 12b and 12c, the sound collection
signal of the microphone 12a and the sound collection signal of the microphone 12b are added
and synthesized, as shown by a dotted circle 120d in FIG. The voice can be reproduced with
various directional characteristics. Similarly, by adding and combining the sound collection
output of the microphone 12b and the sound collection output of the microphone 12c, it is
possible to reproduce voice with directivity characteristics as shown by the dotted circle 120e,
and the sound collection output of the microphone 12c and the microphone 12a By adding and
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synthesizing the collected sound output, it is possible to reproduce the sound with the directivity
characteristic as shown by the dotted circle 120f in the same figure. As described above, by
providing three uni-directional microphones at intervals of 120 degrees and collecting them, it is
possible to reproduce almost all the sound around the circumference.
[0021]
In the following description, the direction of directivity characteristic 120a is direction 1, the
direction of directivity characteristic 120d is direction 2, the direction of directivity characteristic
120b is direction 3, the direction of directivity characteristic 120e is direction 4, the direction of
directivity characteristic 120c is direction 5, The direction of the directivity characteristic 120 f
is called direction 6.
[0022]
In FIG. 1A, on the top surface of the case 10, direction specifying buttons 15-1 to 15-6 are
provided around the sound collection tower 11 in accordance with the directivity direction
(direction 1 to direction 6) described above. It is provided.
The direction specifying button 15-1 is a button switch for specifying the direction 1. Similarly,
direction specification button 15-2 is direction 2, direction specification button 15-3 is direction
3, direction specification button 15-4 is direction 4, direction specification button 15-5 is
direction 5, direction specification button 15-6 is It is a button switch which designates direction
6 respectively. When playing back the recorded voice, when the user designates a direction with
the direction designation button 15, the recording and reproducing apparatus selects and plays
only the voice coming from that direction.
[0023]
Although not shown, in addition to the direction specifying button 15, recording related
operators such as a recording start button, a recording end button, a recording pause button, a
play button, a pause button, a stop button, a rewind / fast forward button Etc. are also provided.
Note that a remote control device may be provided in the device, and the recording-related
operator and the reproduction-related operator may be provided in the remote controller.
04-05-2019
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[0024]
FIG. 2 is a block diagram of the recording and reproducing apparatus 1. Amplifiers 30a, 30b, 30c
and A / D converters 31a, 31b, 31c are connected to the microphones 12a, 12b, 12c,
respectively. The amplifiers 30a, 30b, and 30c amplify audio signals collected by the
microphones 12a, 12b, and 12c. The A / D converters 31 a, 31 b, 31 c convert the collected
sound signals of the microphones 12 a, 12 b, 12 c amplified by the amplifiers 30 a, 30 b, 30 c
into digital audio signals and input them to the control unit 20.
[0025]
The control unit 20 is configured by a microcomputer, and realizes various functions by
executing a program. In the control unit 20, the writing unit 21, the channel selection unit 22,
the reading unit 23, and the mixing unit 24 are functionally implemented. The details of these
will be described later.
[0026]
The control unit 20 includes an operation unit 35 including a direction specification button 15, a
recording related operation element, a reproduction related operation element, etc., a storage 40
which is a large capacity storage device composed of a hard disk or a flash memory, and a D / A
converter 32. It is connected. In the storage 40, audio signals collected by the microphones 12a,
12b and 12c are recorded. An analog audio amplifier 33 is connected to the D / A converter 32.
The audio amplifier 33 is connected to a speaker 14 provided on the front side 10 a of the
apparatus. Thus, although there are three recording systems including the microphones 12a,
12b, and 12c, there is one reproduction system including the speaker 14.
[0027]
The writing unit 21 records three digital audio signals input from the A / D converters 31a, 31b
and 31c in the storage 40 by three-channel recording when the apparatus is in the recording
state.
[0028]
In the following description, the channel on which the audio signal collected by the microphone
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12a is recorded is channel 1, the channel on which the audio signal collected by the microphone
12b is recorded is channel 2, and the audio signal collected by the microphone 12c is The
channel to be recorded is called channel 3.
[0029]
The channel selection unit 22 is a functional unit that selects a channel to be read from the
storage 40 and instructs the reading unit 23 to read.
The channel selection unit 22 selects all of the channels 1, 2, and 3 during playback in the
normal mode in which the direction is not designated by the direction designation button 15.
Further, in the direction designating reproduction mode in which the reproduction direction is
designated by the direction designation button 15, a channel in which the sound of the
designated direction is recorded is selected. For example, when the direction 1 is designated by
the operation of the direction designation button 15-1, the channel 1 in which the audio signal
collected by the microphone 12a is recorded is selected. When the direction 2 is designated by
the operation of the direction designation button 15-2, the channels 1 and 2 in which the audio
signals collected by the microphones 12a and 12b are recorded are selected.
[0030]
The reading unit 23 reads the digital audio signal of the channel instructed from the channel
selection unit 22 from the storage 40 and inputs the read signal to the mixing unit 24. When the
digital audio signal input from the reading unit 23 corresponds to one channel, the mixing unit
24 outputs the digital audio signal to the D / A converter 32 as it is. When the digital audio
signals input from the reading unit 23 are for two or three channels, the digital audio signals are
mixed, and the mixed audio signal is input to the D / A converter 32. The D / A converter 32
converts the digital audio signal input from the mixing unit 24 of the control unit 20 into an
analog signal and inputs the analog signal to the amplifier 33. The amplifier 33 amplifies the
audio signal and outputs it from the speaker 14.
[0031]
When this recording and reproducing apparatus 1 is used for recording a conference, the
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recording and reproducing apparatus 1 is installed at the center of a plurality of participants, and
when the recording button is operated, the recording and reproducing apparatus 1 stores the
participants' utterances on three channels. Record at 40
[0032]
When reproducing the audio recorded in the storage 40, when the reproduction button is
operated, the recording and reproducing apparatus 1 reads out the audio signals of the three
channels in parallel, mixes them, and reproduces them (normal mode).
As described above, when the reproduction direction is not specified, three channels are read in
parallel, and the sound picked up from the entire circumferential direction is reproduced at
substantially the same level. On the other hand, when the user operates any one of the direction
specifying buttons 15, the recording and reproducing apparatus 1 reads out only the sound of
the channel of the specified direction from the storage 40 and reproduces it. In this way, it is
possible to extract and reproduce only the remarks of a person who has been seated in the
direction of the direction designation button among the meeting participants.
[0033]
Here, the user thinks of the arrangement when the recording and reproducing apparatus 1 is
used for recording a conference, and operates the direction designation buttons 15-1 to 6, that is,
the direction of the attendee at the time of recording By operating the direction specification
buttons 15-1 to 6, it is possible to select a channel to be reproduced by an intuitive operation of
specifying the direction in which the attendee was present at the meeting.
[0034]
FIG. 3A is a view showing a usage pattern when the recording and reproducing apparatus 1 is
used in a conference.
Further, FIG. 7B is a view showing a recording state of three tracks recorded in the storage 40 in
the conference.
04-05-2019
10
[0035]
In the figure (A), the recording / reproducing apparatus is installed on the conference console
where the attendees A, B, C and D of the conference are seated. The recording and reproducing
apparatus is installed with the front direction facing in the direction of the attendee B. Therefore,
for the recording / reproducing apparatus, the attendee A is located in the direction 5, the
attendee B is in the direction 1, the attendee C is in the direction 3, the attendee D is in the
direction 4, and the voice of the attendee A is The speech of the channel 3 and the attendee B is
recorded on the channel 1 and the speech of the attendee C is recorded on the channel 2, and the
speech of the attendee D is recorded across the channel 2 and the channel 3.
[0036]
"Are you interested in this matter? In response to the question, attendee B said "if plan A is
better" and attendee C speaks "no good or better plan B ~" and also attendees D "I think I need to
remix! "And said. Each utterance is issued without waiting for the end of the previous utterance,
and as shown in FIG.
[0037]
When the audio signal recorded in this way is reproduced in the normal mode, the speech of all
the channels, that is, all the attendees is reproduced under the same condition, and although the
atmosphere of the entire conference room is known, the speech of each attendee is heard
overlapping. In FIG. 7B, when the user turns on the direction specification button 15-1 for
specifying the direction 1 during the reproduction of the point t1, the reproduction channel is
switched to the channel 1, that is, only the direction 1, and the direction 1 The voice of attendee
B who is seated is played back. At this time, the playback position is rewound to T1 which is the
head of this message. This makes it possible to listen to the message that you want to check from
the beginning. The head position of the speech may be detected based on the volume or the like.
[0038]
The same applies to the case where the direction specifying button 15-4 for specifying the
direction 4 at t2 is turned on. That is, the reproduction channel is switched to channels 2 and 3,
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ie, direction 4, and the voice of only the attendee D who is seated in the direction 4 is
reproduced. At this time, the playback position is rewound to T2, which is the beginning of this
message.
[0039]
FIG. 4 is a flowchart showing the operation of the control unit of the recording and reproducing
apparatus. FIG. 6A shows the operation when the play button is turned on, and FIG. 6B shows the
operation when one of the direction designation buttons is turned on. First, in FIG. 4A, when the
playback button is turned on, it is determined whether or not the current playback operation is in
progress (S1). If the reproduction operation is not being performed (NO in S1), the reproduction
operation in the circumferential direction which is the normal mode is started (S2). That is, the
reading unit 23 reads the digital audio signals recorded in the three channels in parallel and
inputs the read signals to the mixing unit 24. The mixing unit 24 combines these digital audio
signals and outputs the combined signal to the D / A converter 32. The D / A converter 32
converts the input digital audio signal into an analog audio signal and inputs it to the audio
amplifier 33. The audio amplifier 33 amplifies the input analog audio signal and inputs it to the
speaker 14. The speaker 14 emits the input analog audio signal as sound.
[0040]
When the playback operation is in progress when the playback button is turned on (YES in S1), it
is determined whether the playback operation is the playback in the entire circumferential
direction of the normal mode or the playback of only the channel in the designated direction. (S3)
If the reproduction is for only the channel in the designated direction (NO in S3), the operation is
switched to the reproduction operation in the circumferential direction (S4). If the reproduction
is in the circumferential direction (YES in S3), the operation is ended without doing anything.
[0041]
In FIG. 4B, when any one of the direction designation buttons 15-1 to 15-6 is turned on, it is
determined whether the reproduction operation is currently in progress (S5). If the playback
operation is not in progress (NO in S5), playback of only the channel in the direction (designated
direction) designated by the turned on direction designation button is started (S6). When
playback is in progress when the direction specification button is turned on (YES in S5), the head
04-05-2019
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of the immediately preceding speech in the specified direction is searched for rewind (S7), and
the specification from the position where it was rewound The reproduction of only the direction
channel is started (S8).
[0042]
When the pause button is turned on by the user, the operation is stopped at the position at that
time and the state at that time. If the stop button is turned on or the recording is finished, this
routine is exited to end the operation.
[0043]
FIGS. 5 (A) and 5 (B) are views showing the external appearance of a recording and reproducing
apparatus according to a second embodiment of the present invention. The figure (A) is an
external view which shows the state which opened the arms 51 and 52 of the recording and
reproducing apparatus, and the figure (B) shows the external appearance which shows the state
which closed the arms 51 and 52 of the recording and reproducing apparatus. FIG.
[0044]
Referring to FIG. 6A, the recording and reproducing apparatus has a configuration in which two
arms 51 and 52 are provided in a triangular prism-shaped casing 50. A microphone 55-1 having
a single directivity is provided on the side surface 50a on the front side of the housing 50, and on
the top surface of the housing 50, a direction specifying button 56-1 for specifying the directivity
direction of the microphone 55-1 and the speaker 53. Is provided.
[0045]
Moreover, the arms 51 and 52 are rotatably attached to the both ends of the front side 50a via
hinges (not shown). A unidirectional microphone 55-2 is provided on the side surface of the arm
51, and a direction specifying button 56-2 for specifying the directivity direction of the
microphone 55-2 is provided on the upper surface of the arm 51. A unidirectional microphone
55-3 is provided on the side surface of the arm 52, and a direction specifying button 56-3 for
04-05-2019
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specifying the directivity direction of the microphone 55-3 is provided on the upper surface of
the arm 52.
[0046]
By pivoting the arms 51 and 52 at the time of installation, the three microphones 55-1 to 55-3
can be directed in desired directions. The hinges supporting the arms 51 and 52 are provided
with angle sensors 41 and 42 (see FIG. 6), and at the time of recording, audio signals picked up
by the microphones 55-1 to 55-3 are recorded in the storage 40. The detected values of the
angle sensors 41 and 42 at that time, that is, the angles of the arms 51 and 52 are also recorded.
[0047]
FIG. 6 is a block diagram of the recording and reproducing apparatus. In this figure, parts having
the same configuration as the block diagram shown in FIG. This recording and reproducing
apparatus differs from the recording and reproducing apparatus according to the first
embodiment shown in FIGS. 1 to 4 in that the detected values of the angle sensors 41 and 42 and
the angle sensors 41 and 42 are digitized. A / D converter 43 is provided, and detection values
(digital data) of the angle sensors 41 and 42 are input to the control unit 20, and the control unit
20 is provided with an angle comparison unit 25, and a control unit An alarm unit 45 is provided
as an output destination from the unit 20.
[0048]
When the playback button of the operation unit 35 is turned on, the angle comparison unit 25
receives the detected angle values (angles at the time of recording) of the angle sensors 41 and
42 recorded in the storage 40 and the current angle sensors 41 and 42 The detected angle value
(current angle) is compared. If the recording angle and the current angle match, playback is
started. On the other hand, when the two do not match, the alarm unit 45 is driven to urge the
user to change the angle of the arms 51 and 52. The alarm is issued when the current angle of
the arm 51 is too narrow / wide, and when the current angle of the arm 52 is too narrow / wide.
[0049]
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14
FIG. 7 is a flow chart showing the operation of the recording / reproducing apparatus at the time
of reproduction. FIG. 6A shows the operation when the play button is turned on, and FIG. 6B
shows the operation when one of the direction designation buttons is turned on. First, in FIG. 7A,
when the playback button is turned on, it is determined whether the current playback operation
is in progress (S11). If the reproducing operation is not in progress (NO in S11), the current
detection value (current angle) of the angle sensors 41 and 42 is read, and the current angle is
compared with the recording angle recorded in the storage 40 (S12) It is determined whether or
not they match (S13). If the comparison results in agreement (YES in S13), the reproduction
operation in the circumferential direction, which is the normal mode, is started (S15). On the
other hand, when the comparison result does not match (NO in S13), an alarm to urge the angle
change of the arms 51 and 52 is output (S14), and the operation is ended without starting the
reproduction.
[0050]
When the playback operation is in progress when the playback button is turned on (YES in S11),
it is determined whether the playback operation is the playback in the entire circumferential
direction of the normal mode or the playback of only the channel in the designated direction. To
do (S16). If only the channel in the designated direction is to be reproduced (NO in S16), the
operation is switched to the reproduction operation in the circumferential direction (S17). If the
reproduction is in the circumferential direction (YES in S16), the operation is ended without
doing anything.
[0051]
In FIG. 7B, when any one of the direction designation buttons 15-1 to 15-6 is turned on, it is
determined whether the reproduction operation is currently in progress (S21). If the
reproduction operation is not in progress (NO in S21), the current detection value (current angle)
of the angle sensors 41 and 42 is read, and the current angle is compared with the recording
angle recorded in the storage 40 (S22) ), It is determined whether or not they match (S23). If the
comparison results in a match (YES in S23), reproduction of only the channel in the direction
(designated direction) designated by the turned on direction designation button is started (S25).
On the other hand, when the comparison result does not match (NO in S23), an alarm to urge the
angle change of the arms 51 and 52 is output (S24), and the operation is ended without starting
the reproduction.
04-05-2019
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[0052]
When the direction specification button is turned on, if the playback operation is in progress
(YES in S21), the head of the immediately preceding speech in the specified direction is searched
for rewinding (S26), and the specification from the rewinded position The reproduction of only
the direction channel is started (S27).
[0053]
Further, as in the flow chart of FIG. 4, when the pause button is turned on by the user, the
operation is stopped at the position at that time and the state at that time.
If the stop button is turned on or the recording is finished, this routine is exited to end the
operation.
[0054]
By reproducing in the same installation mode as at the time of recording, the reproduction
direction can be selected based on the arrangement of the participants at the time of recording,
and correspondence between the recording channel and the participants of the conference is not
necessary. Selection of (participant) is easy.
[0055]
In this embodiment, although an example in which the recording and reproducing apparatus is
used for recording and reproducing a message in a conference has been described, the
application of the recording and reproducing apparatus is not limited to the conference.
[0056]
Moreover, although the sound collection part of this invention is implement | achieved by a
unidirectional microphone in this embodiment, a sound collection part is not limited to this.
For example, a plurality of sound collection units may be realized by a plurality of sound
collection beams using a microphone array as shown in Japanese Patent Application Laid-Open
04-05-2019
16
No. 2007-256498.
[0057]
DESCRIPTION OF SYMBOLS 1 recording-reproducing apparatus 10 housing | casing 10a front
side side 11 sound collection tower 12a-c microphone 14 speaker 15-1-6 direction designation
button 50 housing 51, 52 arms 55-1-3 microphone 56-1-3 direction designation button
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