close

Вход

Забыли?

вход по аккаунту

?

JP2010050571

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
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 JP2010050571
A sound pickup device for picking up a speaker's voice is provided, which can pick up a sound
while reducing the influence of noise as compared to the prior art. A microphone 16 can pick up
sound by switching the direction of directivity of sound collection to at least two directions. The
sound collected by the microphone 16 is output as an audio signal to the A / D converter 18,
converted into digital data by the A / D converter 18, and stored in the memory 13 in time series.
The inclination sensor 21 detects the inclination of the sound collection device 1 and outputs a
signal indicating the detection result. The CPU 11 controls the directivity setting unit 17 to
switch the directivity direction of the microphone 16 in accordance with the inclination of the
device body detected by the inclination sensor 21. [Selected figure] Figure 1
Sound pickup device
[0001]
The present invention relates to a sound collection device.
[0002]
2. Description of the Related Art Conventionally, a portable sound pickup apparatus for recording
voice has been developed (see, for example, Patent Document 1).
In addition, in order to reduce the influence of noise when recording speech, a technique has
been proposed in which the directivity of sound collection is set to the direction of the speaker
04-05-2019
1
(see Patent Document 2). JP-A-11-31000 JP-A-05-207117
[0003]
As described above, in the sound pickup apparatus, depending on the position of the speaker,
there may be cases where the voice of the speaker can not be clearly recorded due to the
influence of noise. In particular, in a portable sound pickup device held by the user such as a socalled IC recorder, the user may change the direction of the sound pickup device according to the
situation, and the position of the speaker and the sound pickup device Since the relationship is
not constant, the direction of the speaker and the direction of sound collection may be shifted,
and the influence of noise may be increased. The present invention has been made in view of the
above-described circumstances, and provides a technology capable of collecting sound while
reducing the influence of noise as compared with the conventional one. The purpose is
[0004]
In order to solve the above problems, the present invention switches the direction of directivity
of sound collection to at least two directions to enable sound collection, a detection unit that
detects an inclination of a device main body in a predetermined direction, and the detection. And
a control unit configured to switch the direction of the directivity of the sound collection unit in
accordance with the inclination of the apparatus main body detected by the unit.
[0005]
In a preferred aspect of the present invention, the apparatus further comprises comparison
means for comparing the inclination detected by the detection means with a predetermined
sound collection angle with reference to the direction of gravity, and the control means
determines the comparison result by the comparison means. Accordingly, the direction of
directivity of the sound collection means may be switched such that the direction of directivity of
the sound collection means with respect to the direction of gravity is close to the predetermined
sound collection angle.
[0006]
Further, in a further preferable aspect of the present invention, voice data storage means for
storing voice data representing voice collected by the voice collection means, correspondence
relationship between a range of the inclination and a storage mode of the voice data is stored.
Voice corresponding to the voice collected by the sound collection means, selection means for
selecting the memory mode corresponding to the inclination detected by the detection means
04-05-2019
2
with reference to the correspondence memory means, and Storage control means for storing data
in time series in the voice data storage means in the storage mode selected by the selection
means.
[0007]
Further, in a further preferred aspect of the present invention, the correspondence storage
means stores the correspondence between the range of inclination and an identifier for
discriminating the speaker, and the selection means refers to the correspondence storage means.
An identifier corresponding to the inclination detected by the detection unit is selected, and the
storage control unit adds the identifier selected by the selection unit to audio data representing
the sound collected by the sound collection unit. It may be stored in time series in the voice data
storage means.
[0008]
Further, in another preferred aspect of the present invention, the voice data storage means has a
plurality of storage areas, and the correspondence relationship storage means stores
correspondence relationships between the range of inclination and the storage area. The
selection means refers to the correspondence storage means to select a storage area
corresponding to the inclination detected by the detection means, and the storage control means
is a voice representing the voice picked up by the sound collection means The data may be
stored in time series in the storage area selected by the selection means.
[0009]
Further, in a further preferred aspect of the present invention, the apparatus further comprises
determination means for determining whether or not the inclination of the device body has been
changed by a predetermined threshold or more according to the inclination detected by the
detection means. The means may switch the identifier to be selected at the timing when the
determination means determines that the inclination of the device body has been changed by the
threshold or more.
[0010]
According to the present invention, in the sound pickup apparatus for picking up the speaker's
voice, it is possible to pick up sound while reducing the influence of noise as compared with the
conventional case.
[0011]
04-05-2019
3
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
<A: Configuration> FIG. 1 is a view showing a configuration of a portable sound collecting device
1 according to an embodiment of the present invention, and FIG. 2 is a perspective view showing
an appearance of the sound collecting device 1.
The portable sound collection device 1 is a portable sound collection device gripped by an
operator.
In the figure, the CPU 11 reads out and executes a computer program stored in the ROM 12 or
the memory 13 to control each part of the portable sound collecting apparatus 1 via the bus BUS.
The memory 13 is, for example, storage means such as an EEPROM.
The RAM 14 is used as a work area when the CPU 11 executes a computer program.
[0012]
The input unit 15 includes various buttons (not shown) such as a recording start button for
starting recording and a recording end button for ending recording, and outputs a signal
according to an operation by the operator.
The microphones 16a, 16b, and 16c pick up sounds input to the respective microphones, and
respectively output voice signals (analog signals) representing the collected voices.
As shown in FIG. 2, the microphones 16 a, 16 b and 16 c are provided on the front surface of the
sound collection device 1. In the following description, for convenience of explanation, when it is
not necessary to distinguish the microphones 16a, 16b and 16c, these will be referred to as
04-05-2019
4
"microphones 16". The arrangement of the microphones 16 is not limited to that illustrated in
FIG. 2, and any arrangement may be used as long as the direction of the directivity of sound
collection is switched to at least two directions for sound collection. In addition, although the
configuration in the case of including three microphones has been described in FIG. 2, the
number of microphones is not limited to three, and may be more or less than that. It is only
necessary to switch in at least two directions for sound collection.
[0013]
The directivity setting unit 17 sets the directivity of the sound collection of the microphone 16
under the control of the CPU 11. By control of the directivity setting unit 17, the microphone 16
can pick up sound by switching the direction of the directivity of sound collection in various
ways. For example, by delaying the audio signals collected by the microphones 16a, 16b, and 16c
according to the designated direction, and adding them out, a collected sound beam having
strong directivity in a specific direction is formed. Ru. In this embodiment, the arrow A direction
in the drawing is initially set as the pointing direction of the microphone 16. The A / D
conversion unit 18 converts an audio signal (analog signal) output from the microphone 16 into
digital data by A / D conversion. The D / A conversion unit 19 converts digital data supplied from
the memory 13 into an analog signal by D / A conversion in accordance with an instruction to
reproduce sound and outputs the analog data. The speaker 20 emits sound at an intensity
corresponding to the analog signal supplied from the D / A converter 19.
[0014]
The inclination sensor 21 is a sensor that detects the inclination of the main body of the sound
collection device 1 in a predetermined direction. As this inclination sensor 21, for example, a
three-axis acceleration sensor such as a piezoresistive type or a capacitive type is used. FIG. 3 is a
diagram showing the contents of the inclination detected by the inclination sensor 21. As shown
in FIG. As shown in FIG. 3, the inclination sensor 21 detects the inclination angle θa of the main
body of the sound collection device 1 based on the direction of gravity. The inclination of the
sound pickup device 1 main body detected by the inclination sensor 21 is not limited to that
illustrated in FIG. 3, but if the inclination of the sound pickup device 1 main body is detected in a
predetermined direction, It may be
[0015]
04-05-2019
5
<B: Operation> Next, the operation of this embodiment will be described. First, the operator of
the sound collection device 1 performs an operation for starting recording by pressing the
recording start button of the sound collection device 1 or the like. The input unit 15 outputs a
signal corresponding to the content operated by the operator, and the CPU 11 controls each unit
of the sound collection device 1 according to the signal output from the input unit 15 to start
recording. The sound collected by the microphone 16 is output as an audio signal to the A / D
converter 18, converted into digital data (hereinafter referred to as "audio data") by the A / D
converter 18, and stored in the memory 13 in time series. Be done.
[0016]
While the sound collection device 1 is recording, the tilt sensor 21 detects the tilt of the sound
collection device 1 and outputs a signal indicating the detection result. The CPU 11 controls the
directivity setting unit 17 to switch the directivity direction of the microphone 16 in accordance
with the inclination of the device body detected by the inclination sensor 21.
[0017]
Here, an example of the content of the directivity control process performed by the sound
collection device 1 will be described with reference to FIG. First, the CPU 11 detects the
inclination angle θa of the own device from the signal output from the inclination sensor 21.
Next, the CPU 11 compares the detected inclination angle θa with a predetermined reference
angle θd. The reference angle θd is a relative positional relationship between the position of
the user's hand and the position of the speaker such that the user's voice can be suitably
collected when the user grips the sound collection device 1. Preferably, a predetermined value is
set accordingly. The CPU 11 switches the directivity direction of the microphone 16 by
controlling the directivity setting unit 17 so that the directivity direction of the microphone 16
with respect to the gravity direction becomes close to the reference angle θd according to the
comparison result of the two. The directivity setting unit 17 sets the directivity of the
microphone 16 in accordance with an instruction from the CPU 11. Specifically, in the example
shown in FIG. 3, the CPU 11 calculates the difference Δθ between the detected inclination angle
θa and the reference angle θd, and rotates the pointing direction of the microphone 16 from
the initial setting direction A by Δθ. The directivity setting unit 17 is controlled. That is, the
CPU 11 controls the directivity setting unit 17 so that the direction of the directivity of the
microphone 16 with respect to the gravity direction becomes the direction of the reference angle
θd according to the calculated difference Δθ.
04-05-2019
6
[0018]
FIG. 4 is a diagram showing an example of a specific operation of the sound collection device 1.
The example shown in FIG. 4 shows the case where the user S1 uses the sound collection device
1 to record the voice of the speaker S2. In the example shown in the figure, the user S1 tilts the
sound collection device 1 in the direction of the speaker S2 and performs recording. In this case,
if sound collection is performed with the sound collection direction A initially set in the sound
collection device 1, noise is generated because the direction of the speaker with respect to the
sound collection device 1 deviates from the directivity direction A of sound collection. In some
cases, the voice of the speaker can not be recorded clearly under the influence of Therefore, the
sound collection device 1 detects the inclination of the own device, and in consideration of the
detected inclination, controls the direction of directivity of the microphone 16 so that the
directivity direction becomes the direction of the predetermined reference angle θd. . In this
way, the voice of the speaker can be recorded more clearly than in the prior art. The reference
angle predetermined for the sound collection device 1 is preferably an angle according to the
relative positional relationship between the position of the user of the sound collection device 1
and the position of the speaker.
[0019]
The tilt sensor 21 of the sound collection device 1 detects the tilt of the sound collection device 1
while the sound collection device 1 is recording, and sequentially outputs a signal indicating the
detection result every predetermined unit time. The CPU 11 controls the directivity setting unit
17 according to the detection result each time the tilt of the device body of the sound collection
device 1 changes in accordance with the signal output from the tilt sensor 21, and the directivity
direction of the microphone 16 is determined. Switch. By doing this, even if the user S1 changes
the inclination of the sound collection device 1 during recording, it is possible to sequentially set
the pointing direction according to the inclination of the sound collection device 1, and sound
collection with little noise It can be performed.
[0020]
As described above, according to the present embodiment, the directional characteristic is
controlled by mounting a plurality of microphones in the portable recording device, and the
04-05-2019
7
direction characteristic is given by the sensor that detects the user's operation or inclination.
Control the As described above, by performing sound collection in which directivity is controlled
in accordance with the inclination of the device body, better sound collection with less noise can
be achieved as compared to the conventional case.
[0021]
For example, when interviewing, the microphone of the portable recording device is directed to
the interviewer or the interviewee to record the conversation between the interviewer and the
interviewee. In the portable recording apparatus, a tilt is generated by pointing the microphone,
and by performing sound collection with directivity control in accordance with the tilt, better
sound collection with less noise becomes possible.
[0022]
<C: Modified Example> Although the embodiment of the present invention has been described
above, the present invention is not limited to the above-described embodiment, and can be
implemented in other various forms. An example is shown below. In addition, you may combine
the following each aspect suitably. (1) In the above embodiment, the CPU 11 performs control to
switch the directivity of the microphone 16 in various directions, but instead, the directivity of
the microphone 16 is switched to one of two directions. You may The point is that the inclination
sensor 21 detects the inclination of the sound collection device 1, and the CPU 11 may control to
switch the directivity in at least two directions according to the detected inclination.
[0023]
(2) In the above-described embodiment, the speakers may be determined based on the tilt angle
of the sound collection device 1, and the speakers may be separately recorded. Specifically, the
directivity direction may be associated with the speaker (whether you or the other party), and a
flag may be set at the time of recording, or recording may be performed by recording in another
area. In this case, the correspondence relationship between the range of tilt angles and the
storage mode of audio data is stored in the memory of the sound collection device 1 in advance,
and the memory mode corresponding to the tilt angle detected by the tilt sensor 21 by the CPU
11 May be selected with reference to the correspondence stored in the memory, and voice data
representing voice collected by the microphone 16 may be stored in time series in the selected
04-05-2019
8
storage mode.
[0024]
In the above aspect, as a storage aspect of voice data, for example, an identifier for identifying a
speaker may be added. In this case, the correspondence relationship between the range of the tilt
angle and the identifier for identifying the speaker is stored in advance in the memory of the
sound collection device 1, and the CPU 11 refers to the correspondence stored in the memory to
refer to the tilt sensor. An identifier corresponding to the tilt angle detected by 21 may be
selected, and the selected identifier may be attached to voice data and stored.
[0025]
Further, in the above-mentioned case, when the CPU 11 reproduces the recorded voice, only the
voice of a specific speaker may be reproduced. In this case, for example, the CPU 11 may
reproduce only the audio data to which the specific identifier is assigned. By doing this, it
becomes possible to reproduce voice data for each speaker.
[0026]
Further, as another example, for example, an area for storing voice data in the memory is divided
into a plurality of areas, and the correspondence relationship between the range of the tilt angle
and the storage area is stored in advance in the memory. The storage area corresponding to the
tilt angle detected by the tilt sensor 21 may be selected with reference to the correspondence
stored in the (1), and voice data may be stored in the selected storage area.
[0027]
Further, in the above-described aspect, the CPU 11 determines whether or not the tilt angle of
the device body has been changed by a predetermined threshold or more using the tilt detected
by the tilt sensor 21 and the tilt angle is changed by a threshold or more. The identifier to be
selected may be switched at the timing when it is determined that the user has made a decision.
[0028]
(3) In the above embodiment, the voice data representing the voice picked up by the microphone
16 is stored in the memory 13 inside the sound collection device 1. Instead of this, an external
04-05-2019
9
memory such as an external hard disk etc. May be stored.
[0029]
(4) In the above-described embodiment, the CPU 11 compares the inclination angle θa detected
by the inclination sensor 21 with the predetermined reference angle θd so that the directionality
of the directivity approaches the predetermined reference angle. The direction of the directivity
of the microphone 16 is controlled to switch, but the control mode is not limited to this. For
example, the CPU 11 controls the direction of the directivity of the microphone 16 to be equal to
the detected tilt direction. The point is that the CPU 11 may switch the direction of the directivity
of the microphone according to the inclination of the device body.
[0030]
(5) In the above embodiment, the program executed by the CPU 11 of the sound collection device
1 is a magnetic recording medium (magnetic tape, magnetic disc, etc.), an optical recording
medium (optical disc, etc.), a magneto-optical recording medium, a semiconductor memory, etc.
Provided on a computer readable recording medium.
It is also possible to make the sound collection device 1 download via a network such as the
Internet.
[0031]
It is a figure which shows an example of a structure of a sound collection apparatus.
It is a perspective view which shows the external appearance of a sound collection apparatus.
It is a figure for demonstrating the inclination which an inclination sensor detects.
It is a figure for demonstrating the content of operation | movement of a sound collection
apparatus.
04-05-2019
10
Explanation of sign
[0032]
DESCRIPTION OF SYMBOLS 1 ... Sound-collecting apparatus, 11 ... CPU, 12 ... ROM, 13 ...
Memory, 14 ... RAM, 15 ... Input part, 16 ... Microphone, 17 ... Direction setting part, 18 ... A / D
conversion part, 19 ... D / A conversion unit, 20: speaker, 21: tilt sensor.
04-05-2019
11
Документ
Категория
Без категории
Просмотров
0
Размер файла
21 Кб
Теги
jp2010050571
1/--страниц
Пожаловаться на содержимое документа