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JPH03155298

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DESCRIPTION JPH03155298
[0001]
TECHNICAL FIELD The present invention relates to a sound collecting device with a plurality of
microphones. 2. Description of the Related Art In recent years, home audio recording devices
have been rapidly improved in performance as seen in digital audio tapes. Also, with the spread
of home video devices, it is becoming mainstream that so-called high-fidelity 2-channel recording
is performed even with camera-integrated video imaging devices. However, in these home-use
recording devices, only two microphones for picking up a 2-channel stereo signal are used, and a
sufficient sense of reality can not be obtained at the time of reproduction. Also, even if a
microphone of 2 channels or more is prepared, the number of channels on the recording device
side is 2 channels in the standard, so there are not enough channels to record, and a channel
number compressor called a surround encoder in addition to the recording device. Must be
prepared and surround recorded. Hereinafter, a conventional recording system will be described
with reference to the drawings. FIG. 14 is a block diagram showing the configuration of a
conventional recording system, and FIG. 15 is a block diagram showing the internal configuration
of a channel number compressor. In FIG. 14, 1 is a stereo microphone (hereinafter referred to as
a stereo microphone), 2 is a surround microphone (hereinafter referred to as a surround
microphone), 4 is a channel number compressor, and 7 is a two-channel recording device . In FIG.
15, 21 adjusts the levels of a plurality of signals Pn (n = 1 to N2 is an integer) with a plurality of
control signals An (n = 1 to N2 is an integer) and adds them as AnAn и Pn An output mixer, 22 is
a filter to which the output of the mixer 21 is input, 23 is a noise reducer to which the output of
the filter is input, and 24.25 are first and second to which the output of the noise reducer 23 is
input. A phase shifter 26 is a first adder that adds the output of the first phase shifter 24 and the
signal to obtain an output signal Lt, and 27 adds the output of the second phase shifter 25 and
the signal R Second adder for obtaining the output signal Rt. The operation of the conventional
recording system configured as described above will be described below. The signals from the
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stereo microphone 1 and the surround microphone 2 are input to the channel number
compressor 4, the signals from the stereo microphone 1 become L signals and R signals, and the
signals from the surround microphone 2 become signals 5n (n = 1 to N). . The control signal of
the mixer 21 of the channel number compressor 4 is accurately determined by the recording
engineer according to the recording situation and is input in real time. The output of the mixer
21 is band-limited by the filter 22.
Usually, this band limitation is set to a low pass characteristic with a cutoff frequency of 7 kHz.
This is to improve the channel separation scene at the time of decoding. Further, the output of
the filter 22 is input to the noise reducer 23. As the noise reducer 23, for example, a so-called
Dolby B type noise reducer or the like is used as described in Document 1 (Electronics Life,
August 1989, pages 12 to 29). The noise reducer 23 aims to improve the channel separation as
well as the filter. The output of the noise reducer 23 is input to the phase shifters 24 and 25. The
first phase shifter 24 delays the phase by 90 ░, and the second phase shifter 25 delays the
phase by 270 ░. Further, the output of the first phase shifter 24 is added to the L signal to
obtain the output signal Lt, and the output of the second phase shifter 25 is subtracted from the
R signal to obtain the output signal Rt. In this way, it becomes possible to superimpose the signal
of the surround microphone on the two-channel signal and record it, and the signal is recorded
by the two-channel recording device 7. SUMMARY OF THE INVENTION However, in the
conventional recording system as described above, specialized techniques are required for the
operation of the channel number compressor. In fact, in broadcast stations and the like, mixing of
surround signals is usually performed by a plurality of mixing specialists. This is because mixing
of surround signals requires sufficient experience and sensitivity, and familiarity and techniques
of human psychological effects. Therefore, it is difficult to perform surround sound recording
well in ordinary homes using a conventional sound recording system. MEANS FOR SOLVING THE
PROBLEMS In order to solve the above problems, the sound pickup apparatus of the present
invention comprises a microphone for 2-channel stereo sound collection, a plurality of surround
microphones for picking up peripheral sound fields, and a 2-channel microphone. Equipped with
a number-of-channels compressor that superimposes signals of a stereo sound collection
microphone and a surround microphone on two channels, and controls the surround signal
mixing unit of the channel number compressor, localization direction spring image width
converter, and sound image localization enhancer with fuzzy control It is something to do.
Function Adds a surround microphone to a conventional 2-channel stereo microphone, picks up
the surrounding sound field, and uses a fuzzy controller that uses the picked-up signal as an
input to make a comprehensive judgment of the picked-up situation and the channel number
compressor By making such control, it is possible to easily make a realistic recording. EXAMPLES
Hereinafter, the sound pickup apparatus of the first example of the present invention will be
described with reference to the drawings.
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FIG. 1 is a block diagram showing the configuration of a sound collection apparatus according to
a first embodiment of the present invention, and FIGS. 2 to 8 are fuzzy control theory adopted for
a sound image control signal generator according to the first embodiment. And the configuration
of the sound image control signal generator. FIG. 2 is a diagram for explaining the concept of
membership functions, FIG. 3 is a diagram for explaining the basic concept of fuzzy control in the
first embodiment, and FIG. 4 is a fuzzy engine in the first embodiment 6 is a diagram for
explaining the operation of the fuzzy engine in the first embodiment, and FIG. 7 is a block
diagram showing the configuration of the fuzzy computer in the first embodiment, FIG. FIG. 8 is a
block diagram showing the configuration of the sound image control signal generator of the first
embodiment. In FIG. 1, 1 is a stereo microphone, 2 is a plurality of surround microphones, 3 is a
sound image control signal generator to which a zoom control signal, a focus control signal, an
output of the stereo microphone 1 and an output of a plurality of surround microphones 2 are
input. Reference numeral 4 denotes a channel number compressor which is controlled by the
sound image control signal generator 3 with the outputs of the stereo microphone 1 and the
plurality of surround microphones 2 being input. In FIG. 4, FIG. 7 and FIG. 8, 31 is a fuzzy engine
in which all or some of the outputs of the zoom control signal, the focus control signal, the stereo
microphone 1 and the plurality of surround microphones 2 are input, 32 and 35 Is the first one.
It is a second membership function generator, and the membership function of the comparison
concept is defined in the first membership function generator 32, and the membership function
of the control content is defined in the second membership function generator 35. It is 33 is a
soft matching operator and 34 is a maximum element detector. The reference numeral 36
denotes a transaclon device, 37 denotes a plurality of synthesis operators, 38 denotes a plurality
of gravity center operators, and 39 denotes a plurality of fuzzy computers. The sound collection
device configured as described above will be described with reference to FIGS. 1 to 8. First, some
explanations of the fuzzy control adopted in the present embodiment will be made. However,
since fuzzy control is described in detail in reference 2 ("the idea of fuzzy computer", R. Yamaji,
Kodansha), general theory is avoided and only the minimum necessary explanation for
understanding the present embodiment is given. . In the membership function in the present
embodiment, a continuous value is employed as an expression of grade (degree of belonging to a
certain concept). This is not necessarily a continuous value (a discrete value may be used).
On the other hand, the horizontal axis of the membership function (usually, the vertical axis
corresponds to the grade, and the horizontal axis corresponds to the physical quantity such as
the control value or the observed value) takes discrete values. This discrete sampling point on the
horizontal axis is called an element, which is shown in FIG. First, consider the case where there is
no zoom control signal and no focus control signal. The output of the stereo microphone 1 and
the outputs of the plurality of surround microphones 2 are input to the sound image control
signal generator 3. The sound image control signal generator 3 is a fuzzy reasoner, and for the
plurality of fuzzy engines 31, all or some of the outputs of the stereo microphone 1 and the
plurality of surround microphones 2 are elements of the fuzzy input value. input. The
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configuration of the fuzzy engine 31 is as shown in FIG. Each of the fuzzy engines 31 has the
first. There is a second membership function generator 32.35, and in the first membership
function generator 32, the input concept expressing the membership function input to the fuzzy
engine 31 matches a specific concept. The comparison concept to compare with whether or not
is set as a membership function. Also, in the second membership function generator 35, how the
input concept represented by the membership function input to the fuzzy engine 31 corresponds
to the comparison concept represented by the first membership function generator It is defined
in the same way (membership function). A fuzzy memory (see page 110 of the above-mentioned
reference 2) is used as the membership function generator. That is, a membership function
having the output of the first membership function generator 32 and the aforementioned
microphone input value as each element is input to the soft matching operator 33. The soft
matching operator 33 is a corresponding MIN circuit (the reference 2 in the above-mentioned
reference 2). (See page 02), and operates to take the smaller of the corresponding elements of
the two membership functions. The physical concept of soft matching is as shown in FIG. As a
result of soft matching, the maximum lemma 4) 34 is used to detect how much the input concept
and the comparison concept are in agreement. The maximum element detector 34 is an ensemble
MAX circuit (see page 103 of the aforementioned reference 2). That is, the output of the soft
matching operator 33 is processed by the maximum element detector 34, and the grade value a
of the element having the maximum value can be obtained just according to the coincidence. It is
a truncation unit 36 that performs truncation of the output of the second membership function
generator 35 at the output a of the maximum element detector 34.
The physical concept of the trance cage is as shown in FIG. That is, the degree to which the
output of this fuzzy engine contributes to the final control value is adjusted according to the
agreement degree a between the input concept and the comparison concept. Some or all of the
outputs of the plurality of fuzzy engines 31 are input to the combining unit 37. The combining
unit 37 is a correspondence MAX circuit (see page 108 of the above-mentioned reference 2). The
outputs of the plurality of combining operators 37 are deferred by the centroid operator 38 and
converted to crisp values. The output of the gravity center calculator 38 becomes a control value
corresponding to each control object. In the case of the present embodiment, since N control
signals of A1 to AN are required for the sound image control signal generator 3, N synthesis
operators 37 and N gravity centers are prepared. FIG. 3 shows one control example of the fuzzy
control of the present embodiment. Here, in order to simplify the description, the number of
fuzzy control rules is four, and the detection of the localization value of the surround signal will
be described. The output signals of a plurality of surround microphones 2 are made to be the
leftmost element of the input membership function with respect to the fuzzy engine 31 so that
the output signal of the surround microphone arranged at the leftmost is the following. Make the
output signal of the right surround microphone correspond. Soft matching is performed between
the number of input memberships III thus created and the comparison concept in the fuzzy
engine corresponding to the four rules. Further, the soft matching result is quantified by the
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maximum element detector 34. In the example of FIG. 3, the soft matching result of rule 1 is o, 7,
the soft matching result of rule 2 is o, 8, the soft matching result of rule 3 is 0.2, the soft
matching result of rule 4 Is 0.0. According to the soft matching result of each rule, the control
concept in the fuzzy engine corresponding to each rule is transposed. The results of the four
truncations are combined by the combining unit 37, and the center of gravity unit 38 further
obtains crisp control values. In the case of FIG. 3, the control value "Let's localize slightly to the
right" is obtained. Although the zoom control signal and the focus control signal are omitted in
the above description, in the case of the sound pickup apparatus for a video camera with a
camera, the zoom control signal and the focus control signal are used as input memberships of
the sound image control signal generator 3. By adding it as an element of a function, information
on the composition intended by the photographer is added to the fuzzy inference.
For example, when the zoom control signal provides information that the subject of the camera
integrated video camera is at a relatively short distance, it is determined that the sound source is
likely to be the subject, and the sound image is displayed at the position of the subject. By adding
rules such as localization of the image, it is possible to reflect the photographer's intention in the
control signal. That is, a control signal closer to human sensitivity can be obtained. The outputs
A1 to AN of the sound image control signal generator 3 as described above are input to the mixer
21 of the channel number compressor 4. The internal configuration of the channel number
compressor 4 is as shown in FIG. 15, and the output of the mixer 21 is band-limited by the filter
22. Usually, this band limitation is set to a low pass characteristic with a cutoff frequency of 7
kHz. This is to improve channel separation at the time of decoding. Further, the output of the
filter 22 is input to the noise reducer 23. As the noise reducer 23, for example, a so-called Dolby
B type noise reducer or the like is used as described in the above-mentioned Document 1. Like
the filter, the noise reducer 23 aims to improve channel separation. The output of the noise
reducer 23 is input to the phase shifters 24 and 25. The first phase shifter 24 is 90 ░ behind,
and the second phase shifter 25 is 270 ░ behind. The output of the first phase shifter 24 is
added to the L signal to obtain an output signal Lt, and the output of the second phase shifter 25
is subtracted from the R signal to obtain an output signal Rt. The channel number compressor
described above is a so-called surround encoder, and the mixing level of the surround
microphone is controlled by the sound image control signal generator 3 described above, and is
automatically adjusted to the mixing level where the surround effect can be easily obtained.
Apart from that, there is no difference from ordinary surround encoders. Therefore, not only can
a general surround decoder be used at the time of decoding, but there is no sense of discomfort
even if only stereo reproduction is performed without using a decoder. The principle of surround
encoding and decoding is described in detail in, for example, the above-mentioned reference 1
and will not be described here. As described above, by configuring the sound image control
signal generator 3 to which the stereo microphone and the plurality of surround microphones
and the zoom control signal and the focus control signal are input using a fuzzy controller, sound
collection control based on human know-how It will be possible for people who do not have
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special sound collection technology to easily perform surround sound collection.
In addition to the zoom control signal and the focus control signal, image information may be
added to further improve the performance. Although fuzzy control is adopted as the sound image
control signal generator 3 in the present embodiment, some effect can be obtained by classical
control other than fuzzy control. Furthermore, although the output of the microphone is directly
input to the sound image control signal generator 3 in this embodiment, it is input to the sound
image control signal generator 3 after performing peak detection, effective value detection, limit
processing, and other preprocessing. You may A sound pickup apparatus according to a second
embodiment of the present invention will be described below with reference to the drawings. FIG.
9 is a block diagram showing the configuration of a sound collection apparatus according to a
second embodiment of the present invention, and FIG. 10 is a block diagram showing the
configuration of a localization direction sound image width converter according to the second
embodiment. In FIG. 9, 1 is a stereo microphone, 2 is a plurality of surround microphones, 3 is a
sound image control signal generator to which a zoom control signal, a focus control signal, an
output of the stereo microphone 1 and an output of the plurality of surround microphones 2 are
input. Reference numeral 5 denotes a localization direction sound image width converter which is
controlled by the sound image control signal generator 3 with the output of the stereo
microphone 1 inputted. In FIG. 10, 51 is a first variable gain amplifier that receives signal M and
changes in gain according to localization direction control signal d to obtain d @ M, 52 receives
signal S and changes in gain with sound image width control signal W. Second variable gain
amplifier for obtaining W @ S, 53 is a first adder adding the output of the first variable gain
amplifier 51 and the output of the second variable gain amplifier 52, 54 is a first adder A second
adder that adds the output 53 and the signal M to obtain the output U, and 55 is a subtractor
that subtracts the output of the first adder 53 from the signal M and obtains the output V. The
sound collection device configured as described above will be described with reference to FIGS. 9
and 10. FIG. First, consider the case where there is no zoom control signal and no focus control
signal. The output of the stereo microphone 1 and the outputs of the plurality of surround
microphones 2 are input to the sound image control signal generator 3. The sound image control
signal generator 3 is a fuzzy reasoner, and a member such that all or some of the outputs of the
stereo microphone 1 and the surround microphones 2 for the plurality of fuzzy engines 31 are
elements of the fuzzy input value. Enter the ship function. The configuration of the fuzzy engine
is as shown in FIG. 4 which is also used in the description of the first embodiment. Hereinafter,
the present embodiment will be described using the components used in the first embodiment.
Also, since fuzzy control has already been described in the first embodiment, it will not be
described redundantly here.
In the case of the present embodiment, since two side signals d and W of the sound image
control signal generator 3 are required, two combining operation units 37 and two gravity center
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operation units 38 in the sound image control signal generator 3 are prepared. The output of
each barycenter calculator 38 is used as the localization direction control signal d and the sound
image width control signal W, respectively. In the case of a sound pickup device for a camera
integrated video camera, information on the composition intended by the photographer is
obtained by adding the zoom control signal and the focus control signal as elements of the input
membership function of the sound image control signal generator 3. As described in the first
embodiment, it is possible to obtain a control signal closer to human sensitivity by being added
to the fuzzy inference. The outputs d and W of the sound image control signal generator 3 as
described above are input to the first variable gain amplifier 61 and the second variable gain
amplifier 52 of the localization direction sound image width converter 5. A case where a so-called
MS microphone is adopted as the stereo microphone 1 will be considered. The MS microphone is
described in detail in Document 3 (Transistor Technology, Jan. 1983, 397 to 381 Hessi), so this
explanation is omitted here. As disclosed in the above document, in the MS microphone, the
localization direction can be controlled by changing the level of the M signal, and the sound
image width can be controlled by changing the level of the S signal. Since the signal M is input to
the first variable gain amplifier 51, the gain is changed according to the localization direction
control signal d to obtain d @ MM, and the signal S is input to the second variable gain amplifier
52. The gain is changed by the sound image width control signal W to obtain w @ S. The first
adder 53 adds the output of the first variable gain amplifier 51 and the output of the second
variable gain amplifier 52 to obtain 68M + w и S. The second adder 54 adds the output of the first
adder 53 and the signal M to obtain an output U = (1 + d) M + w * S. The subtractor 55 subtracts
the output of the first adder 53 from the signal M to obtain an output V = (1-d) M-w + 18. The
localization direction sound image width converter 5 described above is a so-called direction
mixer. The direction mixer is described in detail on pages 379 to 386 of the above-mentioned
reference 3, so it is omitted here. In the localization direction sound image width converter 5 in
this embodiment, general direction mixers and the like are controlled except that the mixing level
is controlled by the sound image control signal generator 3 described above and the localization
direction and the sound image width are automatically adjusted. There is no difference. As
described above, by configuring the sound image control signal generator 3 to which the stereo
microphone and the plurality of surround microphones and the zoom control signal and the
focus control signal are input using a fuzzy controller, sound collection control based on human
know-how Thus, even people who do not have a special sound pickup technology can easily pick
up sound with the optimal localization direction and sound image width.
In addition to the zoom control signal and the focus control signal, image information may be
added to further improve the performance. Although fuzzy control is adopted as the sound image
control signal generator 3 in the present embodiment, some effect can be obtained by classical
control other than fuzzy control. Furthermore, although the output of the microphone is directly
input to the sound image control signal generator 3 in this embodiment, it is input to the sound
image control signal generator 3 after being subjected to peak detection, effective value
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detection, limit processing, and other preprocessing. May be Hereinafter, the sound pickup
apparatus of the third embodiment of the present invention will be described with reference to
the drawings. FIG. 11 is a block diagram showing the configuration of a sound collection device
according to a third embodiment of the present invention, and FIG. 12 is a block diagram
showing the configuration of a sound image localization enhancer according to the third
embodiment. In FIG. 11, 1 is a stereo microphone, 2 is a plurality of surround microphones, 3 is a
sound image control signal generator to which a zoom control signal, a focus control signal, an
output of the stereo microphone 1 and an output of the plurality of surround microphones 2 are
input. A sound image localization enhancer 6 is controlled by the sound image control signal
generator 3 with the outputs of the stereo microphone 1 and the plurality of surround
microphones 2 being input. In FIG. 12, 61 is a first adder for adding the signal X and the signal Y,
62 is a variable delayer for delaying the output of the first adder 61 according to the delay time
control signal, 63 is a variable delayer 62. Is added to the signal X to obtain the output Xt, and
64 is a subtractor for subtracting the output of the variable delay 82 from the signal Y to obtain
the output Yt. The sound collection device configured as described above will be described using
FIGS. 11 and 12. FIG. First, consider the case where there is no zoom control signal and no focus
control signal. The output of the stereo microphone 1 and the outputs of the plurality of
surround microphones 2 are input to the sound image control signal generator 3. The sound
image control signal generator 3 is a fuzzy reasoner, and a member such that all or some of the
outputs of the stereo microphones and the surround microphones 2 for the multiple fuzzy
engines 31 are elements of the fuzzy input value. Enter the ship function. The configuration of
the fuzzy engine is as shown in FIG. Hereinafter, the present embodiment will be described using
the components used in the first embodiment. Also, since fuzzy control has already been
described in the first embodiment, it will not be described redundantly here. In the case of the
present embodiment, only the delay time control signal t is required as the control signal of the
sound image control signal generator 3, and therefore only one combining operator 37 and one
gravity center operator 38 may be provided.
In the case of a sound pickup device for a camera integrated video camera, information on the
composition intended by the photographer by adding a zoom control signal and a focus control
signal as elements of the input membership function of the sound image control signal generator
3 Is added to the fuzzy reasoning, and a control signal closer to human sensitivity can be
obtained, as described in the first embodiment. The output t of the sound image control signal
generator 3 as described above is input to the variable delay unit 62 of the sound image
localization enhancer 6. An output X + Y of a first adder 81 that adds the signal X and the signal
Y is input to the variable delay unit 62. A variable delay 62 is provided to delay the delay time
control signal and to control the sense of the spread of the sound image. The second adder 63
adds the output of the variable delay unit 62 to the signal X to obtain an output Xt = X + delaY (t,
X + Y). Further, the subtractor 84 subtracts the output of the variable delay 62 from the signal Y
to obtain an output Yt = Y?delaY (t, X + Y). Here, delay (t, X) indicates that the input X is delayed
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by time t. The sound image localization enhancer 6 described above is a so-called ambience, and
the mixing level of the surround microphone is controlled by the sound image control signal
generator 3 described above, and is automatically adjusted to the most robust sound image
method. Since this is a general technique except for the above, it will not be described here. As
described above, by configuring the sound image control signal generator 3 to which the stereo
microphone and the plurality of surround microphones and the zoom control signal and the
focus control signal are input using a fuzzy controller, the sound collecting side based on human
know-how 87% is possible, and even people who do not have a special sound collection
technology can easily pick up sound by performing optimal sound image localization
enhancement. In addition to the zoom control signal and the focus control signal, image
information may be added to further improve the performance. Although fuzzy control is adopted
as the sound image control signal generator 3 in the present embodiment, some effect can be
obtained by classical control other than fuzzy control. Furthermore, although the output of the
microphone is directly input to the sound image control signal generator 3 in this embodiment, it
is input to the sound image control signal generator 3 after being subjected to peak detection,
effective value detection, limit processing, and other preprocessing. May be Hereinafter, a sound
pickup apparatus according to a fourth embodiment of the present invention will be described
with reference to the drawings. FIG. 13 is a block diagram showing the configuration of a sound
collection device according to a fourth embodiment of the present invention.
In FIG. 13, 1 is a stereo microphone, 2 is a plurality of surround microphones, 3 is a sound image
control signal generator to which a zoom control signal, a focus control signal, an output of the
stereo microphone 1 and an output of a plurality of surround microphones 2 are input. 6 is a
sound image localization enhancer controlled by the sound image control signal generator 3 with
the output of the stereo microphone 1 input, and 5 is a localization direction sound image
controlled with the sound image control signal generator 3 with the output of the sound image
localization enhancer 6 A width converter 4 is a channel number compressor controlled by the
sound image control signal generator 3 with the output of the localization direction sound image
width converter 5 and the outputs of the plurality of surround microphones 2 being input. The
sound collection device configured as described above will be described with reference to FIG.
First, consider the case where there is no zoom control signal and no focus control signal. The
output of the stereo microphone 1 and the outputs of the plurality of seven surround
microphones 2 are input to the sound image control signal generator 3. The sound image control
signal generator 3 is a fuzzy reasoner, and a member such that all or some of the outputs of the
stereo microphone 1 and the surround microphones 2 for the plurality of fuzzy engines 31 are
elements of the fuzzy input value. Enter the ship function. The configuration of the fuzzy engine
is as shown in FIG. In the case of this embodiment, since the control signals of the sound image
control signal generator 3 require N pieces from A1 to AN, the sound image width control signal
W, the localization direction control signal d and the delay time control signal t Each of 37 and
the barycenter calculator 38 is provided N + 3. In the above description, the zoom control signal
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and the focus control signal are omitted, but in the case of the sound pickup apparatus for a
camera integrated video camera, the zoom control signal and the focus control signal are used as
input memberships of the sound image control signal generator 3 By adding it as an element of a
function, information of the composition intended by the photographer is added to the fuzzy
inference, and a control signal closer to human sensitivity can be obtained. The output A1 to AN
of the sound image control signal generator 3 as described above is input to the channel number
compressor 4, the sound image width control signal W and the localization direction control
signal d are input to the localization direction sound image width converter 5, and delay time The
control signal t is input to the sound image localization enhancer 6. The signal of the stereo
microphone 1 is first processed by the sound image localization enhancer 6 and then processed
by the localization direction sound image width converter 5. Finally, the output of the localization
direction sound image width converter 5 and the output of the surround microphone 2 are
processed by the channel number compressor 4 to obtain a 2-channel signal. As described above,
by configuring the sound image control signal generator 3 to which the stereo microphone and
the plurality of surround microphones and the zoom control signal and the focus control signal
are input using a fuzzy controller, sound collection control based on human know-how Therefore,
even if a person who does not have a special sound pickup technology can easily perform
optimum sound image localization enhancement, optimum localization direction / sound image
width control, and surround sound collection all at the same time.
In addition to the zoom control signal and the focus control signal, image information may be
added to further improve the performance. In the present embodiment, the processing is
performed in the order of the sound image localization enhancer 6, the localization direction
sound image width converter 5, and the channel number compressor 4, but the processing may
not necessarily be performed in this order. Although fuzzy control is adopted as the sound image
control signal generator 3 in the present embodiment, some effect can be obtained by classical
control other than fuzzy control. Furthermore, although the output of the microphone is directly
input to the sound image control signal generator 3 in this embodiment, it is input to the sound
image control signal generator 3 after being subjected to peak detection, effective value
detection, limit processing, and other preprocessing. May be Effects of the Invention As described
above, the sound pickup apparatus of the present invention includes a plurality of surround
microphones for picking up a peripheral sound field and a 2 channel stereo sound pickup
microphone in addition to the conventional microphone for 2 channel stereo sound pickup A
channel number compressor for superimposing signals of surround microphones on two
channels is provided, and control of a surround signal mixing unit of the channel number
compressor, a localization direction sound image width converter, and a sound image localization
enhancer is performed by fuzzy control. By adopting fuzzy control, advanced recording
technology know-how, which only a special mixing engineer had in the past, can be incorporated
into the control device, and advanced recording can be performed easily.
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[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing the configuration of a sound pickup apparatus according to a
first embodiment of the present invention, FIG. 2 is a signal diagram for explaining the concept of
membership functions in the embodiment, and FIG. 4 is a block diagram showing the
configuration of the fuzzy engine in the embodiment, and FIGS. 5 and 6 are for explaining the
operation of the fuzzy engine in the embodiment. FIG. 7 is a block diagram showing the
configuration of a fuzzy computer in the embodiment, FIG. 8 is a block diagram showing the
configuration of a sound image control signal generator in the embodiment, and FIG. 9 is a
second embodiment of the present invention. FIG. 10 is a block diagram showing the
configuration of the localization direction sound image width converter in the embodiment, and
FIG. 11 is a sound collection device in the third embodiment of the present invention. of FIG. 12
is a block diagram showing the configuration of the sound image localization enhancer in the
embodiment, and FIG. 13 is a block diagram showing the configuration of sound collection in the
fourth embodiment of the present invention, FIG. FIG. 15 is a block diagram showing the
configuration of a conventional recording system, and FIG. 15 is a block diagram showing the
configuration of a channel number compressor.
1 иии Stereo microphone, 2 и и и Surround microphone, 3 и и и Sound image control signal generator и
4 и Channel number compressor и 5 и Localization direction sound image width converter и 6 и
Sound image localization Enhancer, 21: Mixer, 22: Filter, 23: Noise reducer, 24.25: Phase shifter,
2B, 53.54.81.63: Adder, 27. 55.84 Subtractor 31 Fuzzy engine 32.35 Membership function
generator 33 Soft matching operator 34 Maximum element detector 36 и Trang cage Ron unit, 37
... synthetic calculator, 38 ... center of gravity calculator, 51.52 ... variable-gain amplifier, 62 ...
variable delay.
10-05-2019
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