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DESCRIPTION JPH11146484

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DESCRIPTION JPH11146484
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
howling suppression apparatus for suppressing howling under optimum conditions under
various circumstances.
[0002]
2. Description of the Related Art Conventionally, various techniques have been proposed to
suppress howling. For example, there is a method of detecting the occurrence of howling and
suppressing howling based on the detection result. According to this technology, it is possible to
suppress howling that occurs in actual usage conditions at that time, but processing time is
required to suppress howling, and howling is detected after the component of howling has
increased to a certain extent. In the meantime, there has been a problem that howling can not be
suppressed until then. In addition, there is also a problem that the sound quality is greatly
affected by dynamically changing the suppression parameter after detection.
[0003]
SUMMARY OF THE INVENTION In order to avoid such problems, for example, in JP-A-8-130792,
a frequency band in which howling occurs is predicted by measuring a frequency characteristic
and the like, and howling is suppressed in advance. And means for setting the means for If such
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means are used, the sound quality will not be affected, but if it is actually used, various factors
such as movement of the position of the speaker or microphone, temperature change due to
movement of people or objects, etc. There is a problem that howling can not be suppressed if the
conditions are different from the measured conditions. In addition, in order to measure the
condition where howling occurs beforehand, it took a lot of labor. In addition, means has also
been proposed to modulate the audio signal to a degree that does not cause hearing problems to
prevent howling. However, although this method can effectively suppress howling even when the
acoustic condition changes, there is a problem that deterioration of sound quality due to
modulation can not be avoided.
[0004]
The present invention has been made to solve the above-described problem, and provides a
howling suppression device capable of effectively suppressing howling according to a situation of
use without degrading sound quality. With the goal.
[0005]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention
according to claim 1 is a sound pickup means for converting collected sound into a signal, and a
signal outputted by the sound pickup means. In a howling suppression apparatus of an
amplification system having a sound generation means for amplifying and generating sound from
a speaker, a howling record detecting information about a frequency detected by the howling
frequency detection means for detecting a frequency at which howling occurs and a howling
frequency detection means And means.
[0006]
The invention according to claim 2 is the control according to the invention according to claim 1,
wherein when the howling frequency is detected by the howling frequency detection means, the
detected howling frequency is attenuated to suppress the howling. The method further comprises
a howling control means, wherein the howling recording means records the howling suppression
status by the first howling control means for each frequency at which the howling occurs.
[0007]
The invention according to claim 3 is the control according to the invention according to claim 1
or 2, wherein based on the howling suppression status recorded by the howling recording means,
control is performed to attenuate the specific frequency to suppress howling. And a second
howling control means to perform.
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[0008]
The invention according to a fourth aspect is the invention according to the second or third
aspect, wherein, after the howling is suppressed by the second howling control means, an initial
state of returning the suppression characteristic of the first howling control means to an initial
state The method further comprises:
[0009]
The invention according to a fifth aspect of the present invention, in the invention according to
the third or fourth aspect, further comprises a sound non-recognition period recognition means
for recognizing a period in which no sound is picked up, and the second howling control means It
is characterized in that control is performed to set the suppression characteristic in a period
recognized as a no sound collecting period by the sound collecting period recognition means.
[0010]
The invention according to claim 6 relates to the invention according to any one of claims 3 to 5,
wherein the second howling control means selects an arbitrary means from a plurality of control
means, and selects the selected means alone. It is characterized in that or in combination of two
or more.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0012]
??
First Embodiment 1-1.
Configuration of First Embodiment (1).
Overall Configuration of First Embodiment FIG. 1 is a block diagram showing the configuration of
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the first embodiment.
The present embodiment is an example in which the present invention is applied to a karaoke
apparatus in order to suppress howling that occurs in karaoke.
In the figure, reference numeral 100 denotes a howling cancellation unit, which suppresses
howling by controlling the frequency characteristic of a signal input from the microphone 200.
The detailed configuration will be described later.
The song data recording unit 300 stores song data for karaoke, and supplies the recorded song
data to the howling cancellation unit 100 and the reproduction system 400.
For example, a recording medium such as a ROM or a hard disk is applicable, and may be
connected via a communication line. The song data may be, for example, data normally used for
karaoke, such as data created according to the MIDI standard, or data dedicated to the present
apparatus. The reproduction system 400 reproduces the supplied music data so as to be able to
output a voice, and includes a sound source and the like. The amplifier 500 amplifies the signals
output from the howling cancellation unit 100 and the reproduction system 400 together. Then,
the amplified signal is output from the speaker 600.
[0013]
(2) Configuration of the howling cancellation unit Here, the configuration of the howling
cancellation unit 100 will be described. FIG. 2 is a block diagram showing the configuration of
the howling cancellation unit 100. As shown in FIG. In the present embodiment, the howling
cancellation unit 100 includes two types of howling band suppression filters. One is a filter for
suppressing howling generated at that time by attenuating the frequency each time howling
occurs, and is shown as a first howling band suppression filter 101 in the figure. The other is a
filter for preventing the occurrence of howling by previously attenuating the frequently
occurring frequency, and is shown as a second howling band suppression filter 102 in the figure.
Each of the first howling band suppression filter 101 and the second howling band suppression
filter 102 is composed of a plurality of band suppression filters, and each of the band
suppression filters has free center frequency, bandwidth, and suppression level. Use what can be
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set to The bandwidth, the sound quality, and the number of suppression filters have the following
relationship. First, if the bandwidth of each band suppression filter is increased, the frequency
components to be suppressed by one band suppression filter become wider, which leads to the
deterioration of sound quality, but the number of howling band suppression filters can be
reduced. On the other hand, as the bandwidth is narrowed, only the howling frequency
component can be efficiently suppressed, so the influence on the sound quality may not be small,
but it is necessary to increase the number of suppression filters. However, in an actual apparatus,
due to hardware limitations, the number of band rejection filters that the apparatus has is limited
to a small number. Therefore, in the present embodiment, first, the entire frequency region is
divided at a frequency resolution sufficient for howling suppression, and a predetermined
number of bands are set in advance. By controlling the center frequency and bandwidth of a
plurality of band rejection filters, it is assigned to the band in which howling is occurring. In this
case, it is sufficient for the bandstop filter to be prepared according to the number of bands
where howling is expected to occur, so the number can be much smaller than the total number of
bands. As an example of the present embodiment, the frequency resolution sufficient for
suppressing howling is 1/12 octave, the frequency band in which howling may occur is divided
into 128, and the frequency number is set from 0 for each band. It shall be assigned a number of
127 and managed. The relationship between the frequency number Fno and the center frequency
F of each band in this case can be expressed by the following equation.
F = Fk О power (2.0, (Fno?Fnok) / 12) Fk: Reference frequency Fnok: Offset value of frequency
number Here, when Fnok = 70, the reference center frequency is Fk = 1000 If it is set to (Hz), the
expression F = 1000 О power (2.0, (Fno-70) / 12) is obtained. Thus, if frequency number Fno =
0, then the center frequency is F = 1000 О power (2.0, (?70/12)) = 17.5 Hz, and if Fno = 70,
the center frequency is 1000 О power (2.0, (0/12)) = 1000 Hz. Therefore, the frequency band in
which howling may occur is 17.5 Hz when Fno = 0, and 26.9 KHz when Fno = 127. Both the first
howling band suppression filter 101 and the second howling band suppression filter 102 are
configured as described above.
[0014]
Next, howling frequency detection means 103 analyzes the voice input from the microphone to
determine whether or not howling occurs, and if howling occurs, detects the frequency. By the
way, howling occurs when the audio output from the speaker is input to the microphone again
and the feedback gain at a specific frequency exceeds one. Therefore, the howling frequency
detection means 103 is configured to obtain the frequency spectrum of the signal from the
microphone 200 by, for example, FFT analysis, and obtain the frequency at which howling occurs
from its peak value. Furthermore, frequency analysis may be performed using a plurality of band
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pass filters or the like, and when a certain frequency is greater than a predetermined value, it
may be determined that howling occurs at that frequency. Also, other known means such as a
method of detecting the zero crossing point of the signal of the microphone 200 and determining
the howling period from the interval may be used. Next, when the howling frequency is detected
by the howling frequency detection means 103, the first howling control means 104 sets the
howling band suppression filter 101 in order to suppress the howling by attenuating the
detected frequency. I do. Furthermore, for the howling control result of the first howling control
means 104, the number of occurrences of howling (howl_count) and suppression level
(howl_gain) are recorded as one data set in the howling recording means 105 for each band
described above. I am trying to do it. The name of the recording area in this case is called a
frequency table [howl_tbl [Fno]] (see FIG. 5). As a recording medium constituting the howling
recording means 105, a recording medium which is readable and writable and in which
information can be stored even when the power is turned off, for example, a non-volatile memory
is used. Next, the second howling control means 106 sets the second howling band suppression
filter 102 based on the information recorded in the howling recording means 105, the operation
of which will be described later.
[0015]
???? Operation of the First Embodiment Next, the operation of the first embodiment having
the above configuration will be described. FIG. 3 is a flowchart showing the operation of the first
embodiment. First, when the power supply of this apparatus is turned on, initial setting for the
first howling band suppression filter 101 and the second howling band suppression filter 102 is
performed (S10). Here, the characteristics of the plurality of band suppression filters constituting
the first howling band suppression filter 101 are all set to be flat. The characteristics of the
second howling band suppression filter 102 are set in accordance with the data recorded in the
frequency table [howl_tbl [Fno]]. When this device is already used and howling occurrence
frequency and attenuation amount are recorded in the frequency table [howl_tbl [Fno]], the
center frequency of each band suppression filter, as in the processing described later (S17), Set
bandwidth, suppression level. If the device has never been used in the past, it is assumed that a
default value (for example, flat) is recorded, and the setting is similarly performed according to
the data.
[0016]
Next, music data to be played is supplied from the music data recording unit 300 to the music
data reproduction system 400 and the howling cancellation unit 100. Then, the music data is
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reproduced by the music data reproduction system 400, and the performance is started (S11).
When the singing section of karaoke starts, the singer starts singing toward the microphone 200,
so an audio signal is input from the microphone 200 (S12), and the input audio signal is sent to
the howling frequency detection means 103 of the howling cancellation unit 100. Supplied. Here,
it is determined by the howling frequency detection means 103 whether or not howling is
occurring, and if howling is occurring, the frequency is detected (S13).
[0017]
If the occurrence of howling is detected, the process proceeds to step S14 where the first
howling control means 104 sets the characteristics of the first howling band suppression filter
101 to attenuate the howling frequency. By this processing, when howling occurs, howling can
be suppressed each time. Here, the setting of the first howling band suppression filter 101 will be
described. When howling is detected by the howling frequency detection means 103, the first
howling control means 104 determines which band suppression filter is used to attenuate the
detected frequency. Here, if there is a band suppression filter having the same setting as that of
the frequency band from each band suppression filter, the filter is used, and if there is no filter
having the same setting, another filter (for example, flat not used yet) Filter of the following
characteristics. Then, with respect to the selected band suppression filter, the gain for the
detected howling frequency is decreased by a predetermined amount at predetermined time
intervals until the howling is not detected. In addition, you may provide a restriction | limiting,
such as a maximum of -12 dB, in down width. For example, when the howling frequency
detection means detects the frequency f, the first howling control means 104 sets the first
howling band suppression filter 101 so as to reduce the gain of the frequency f (see FIG. 4). At
this time, when two or more howling frequencies are detected, a bandstop filter is assigned to
each of them to suppress howling.
[0018]
Then, as shown in the flowchart of FIG. 3, when the howling is detected and the frequency band
is attenuated by the first howling band suppression filter 101, the information is recorded in the
howling recording means 105 (S15). That is, the first howling control means 104 lowers the gain
of the frequency at which the howling occurs until the howling stops, and outputs the level at
which the howling stopped and the number of the frequency band to which the frequency
belongs to the howling recording means 105. FIG. 5 shows the contents of the frequency table.
As shown in the figure, the frequency table records the frequency number, the number of times
howling has occurred, and the average value of the suppression level. The howling recording unit
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105 updates the frequency table as follows according to the information (Fno and howl_gain)
supplied from the first howling control unit 104. The number of occurrences of the frequency
number Fno at which howling is detected (howl_tbl [Fno] .howl_count) is incremented by one.
For the suppression level (howl_tbl [Fno] .howl_gain), a new average value is calculated and
updated to that value. howl_tbl [Fno] .howl_count + = 1; howl_tbl [Fno] .howl_gain = (howl_tbl
[Fno] .howl_gain * howl_tbl [Fno] .howl_count + howl_gain) / (howl_tbl [Fno] .howl_count + 1)
[0019]
The cumulative attenuation is determined as described above. In this case, the cumulative
amount can be obtained by multiplying the suppression level (howl_tbl [Fno] .howl_gain), the
number of occurrences, and (howl_tbl [Fno] .howl_count). Then, the newly set attenuation
amount (howl_gain) is added to the attenuation amount obtained as described above to obtain
the latest accumulated attenuation amount. By dividing this cumulative amount of attenuation by
the latest number of detections (howl_tbl [Fno] .howl_count + 1), the average amount of
attenuation to be recorded at the inhibition level (howl_tbl [Fno] .howl_gain) can be obtained.
[0020]
Next, the second howling control means 106 determines whether it is currently a singing section
(S16). Although the determination means is determined from the music data supplied from the
music data storage unit 300 here, the present invention is not limited to this and an instruction
means (not shown) may be provided. Usually, the karaoke song contains information indicating
the start and end of the singing section, and contains data on a guide melody that instructs the
singer on the melody. It is determined from such data whether or not it is a singing section, and
the subsequent processing is performed. If it is determined that the section is a singing section,
the process returns to step S12 and waits for voice input again. On the other hand, if it is
determined that the section is not a singing section, the second howling control means 106
changes the characteristics of the second howling band suppression filter 102 with reference to
the recorded contents of the frequency table of the howling recording means 105. (S17).
[0021]
The second howling control means 106 extracts data as many as the number of band
suppression filters included in the second howling band suppression filter 102 with reference to
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the number of occurrences (howl_tbl [Fno] .howl_count). Further, the extraction criterion may be
a predetermined number higher than a predetermined number of times or may be another
criterion. Then, the characteristics (center frequency, bandwidth, and so on) of the band
suppression filters of the second howling band suppression filter 102 so that the extracted
frequency numbers (Fno) are attenuated by the suppression level (howl_tbl [Fno] .howl_gain). Set
the suppression level). For example, in FIG. 6, the values of ?frequency number?, ?number of
occurrences?, and ?suppression level? when the top five samples having a large number of
occurrences are extracted, and the characteristics of the second howling band suppression filter
102 are shown. There is. After this setting, the generation of howling is suppressed in advance
for the frequency belonging to the set frequency number. In addition, since the characteristics of
the filter are changed when no sound is input from the microphone 200, it is possible to prevent
a sense of incongruity, deterioration of sound quality, and the like due to a change in frequency
characteristics during singing.
[0022]
Then, after changing the setting of the second howling band suppression filter 102, the
characteristics of the first howling band suppression filter 101 are made flat (S18). That is, until
the step S18, the suppression level remains set in the step S14 when the howling is detected, but
this information is reflected in the second howling band suppression filter 102 in the step S17.
The characteristics of the first howling band suppression filter 101 are returned to the original
state. Thereafter, if the supply of the music data from the music data recording unit 300 is ended
(S19), the operation of the present apparatus is ended, but if the music data is not ended, the
process returns to step S12 and the voice input is performed. I will wait. Then, when the voice is
input next, since the second howling band suppression filter 102 is set in step S17, howling
occurrence prevention suitable for the use situation is performed. Further, in step S18, since the
characteristic of the first howling band suppression filter 101 is flat (initialized), when howling is
newly detected, it changes to the characteristic of attenuating the howling frequency band, and
next time The characteristic is held until the second howling band suppression filter 102 is set in
step S17.
[0023]
Here, the recording process of the howling recording means 105 will be described in more detail.
First, the information of the attenuation amount supplied from the first howling control means
104 does not necessarily coincide with the overall attenuation amount at that time. That is, this is
because the overall attenuation amount is the sum of the attenuation amount of the second
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howling band suppression filter 102 and the attenuation amount of the first howling band
suppression filter 101. For example, when howling occurs at a certain frequency and is
attenuated by the first howling band suppression filter 101 and then switched to suppression by
the second howling band suppression filter 102, if howling occurs again at the same frequency,
the first The amount of attenuation is added to the amount attenuated at the previous time (the
amount of attenuation of the second howling band suppression filter 102 at that time). Be done.
For example, when the first attenuation amount of the first howling band suppression filter 101
is ?2 dB, if it is attenuated by ?3 dB when howling is detected at the second time, the second
attenuation amount is in the initial stage. On the contrary, it is attenuated by -5 dB. Therefore,
the value of howl_gain is "5". Note that the value recorded in the ?suppression level? is not
necessarily limited to the average value, and may be another value.
[0024]
?? Second Embodiment Next, a second embodiment will be described. In the first embodiment,
two filters including the first howling band suppression filter 101 and the second howling band
suppression filter 102 are provided. In the second embodiment, one howling band suppression
filter and howling control means are provided. Will be described. The configuration shown in FIG.
1 is the same as that of the first embodiment, and thus the description thereof is omitted.
[0025]
FIG. 7 is a block diagram showing the configuration of the howling cancellation unit 100 in the
second embodiment. However, about the same composition as a 1st embodiment, the same
numerals are attached and explanation is omitted. The howling band suppression filter 111 is
composed of a plurality of band suppression filters that can freely change the center frequency,
the bandwidth, and the suppression level as the two howling band suppression filters used in the
first embodiment. The howling control unit 112 sets the center frequency, bandwidth, and
suppression level of each band suppression filter that configures the howling band suppression
filter 111. In the second embodiment, the howling control unit 112 is supplied with music data
from the music data storage unit 300.
[0026]
FIG. 8 is a flowchart showing the operation of the second embodiment. First, when the power
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supply of this apparatus is turned on, initialization of the howling band suppression filter 111 is
performed (S20). Here, the characteristics of the howling band suppression filter 111 are set in
accordance with the data recorded in the frequency table. If the present apparatus is already
used and howling occurrence frequency and attenuation amount are recorded, the center
frequency, bandwidth and suppression level of each band suppression filter are set in the same
manner as the processing described later (S28). If the device has never been used in the past, it is
assumed that the default value is recorded, and the same setting is performed according to the
data.
[0027]
Next, music data to be played is supplied from the music data recording unit 300 to the music
data reproduction system 400 and the howling cancellation unit 100. Then, the music data is
reproduced by the music data reproduction system 400, and the performance is started (S21).
When the singing section of karaoke starts, the singer starts singing toward the microphone 200,
so an audio signal is input from the microphone 200 (S22), and the input audio signal is sent to
the howling frequency detection means 103 of the howling cancellation unit 100. Supplied.
When the occurrence of howling is detected, the howling control means 112 controls the
howling band suppression filter 111 to attenuate the howling frequency (S24). This operation is
similar to the setting of the first howling band suppression filter 101 described in the first
embodiment.
[0028]
When the frequency band is attenuated by the howling band suppression filter 111, the
information is recorded in the howling recording means 105 (S25). That is, the howling control
means 112 reduces the gain of the frequency at which the howling occurs until the howling
stops, and outputs the level at which the howling has stopped and the number of the frequency
band to which the frequency belongs to the howling recording means 105. The howling
recording unit 105 updates the frequency table according to the information (Fno and
howl_gain) supplied from the howling control unit 112 (S25) as in the first embodiment (step
S15 in FIG. 3).
[0029]
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Next, the second howling control means 106 determines whether it is currently a singing section
(S26). If it is determined that the section is a singing section, the process returns to step S22 and
waits for voice input again. On the other hand, when it is determined not to be the singing
section, the howling control means 112 changes the characteristics of the howling band
suppression filter 111 with reference to the recorded contents of the frequency table of the
howling recording means 105 (S27). The method of setting the characteristics is the same as the
setting of the second howling band suppression filter 102 in the first embodiment (step S17 in
FIG. 3). Thereafter, if the supply of the music data from the music data recording unit 300 is
ended (S28), the operation of the present apparatus is ended, but if the music data is not ended,
the process returns to step S12 and the voice input is performed. I will wait.
[0030]
As described above, in the second embodiment, every time howling occurs, the frequency is
attenuated using any of the band suppression filters of the howling band suppression filter 111
(S 25), and the stored information (frequency table) Based on the above, the setting of the
howling band suppression filter 111 is performed in the non-singing section in order to prevent
generation in advance for the band with high generation frequency (S26, S27). Thereby, the same
effect as that of the first embodiment can be realized by one howling band suppression filter 111
and one system of howling control means 112. The second embodiment is an embodiment in
which the first howling control means and the second howling control means of the present
invention are realized by one system (howling control means 112 and howling band suppression
filter 111).
[0031]
?? Modifications The present invention is not limited to the above-described embodiment, and
various modifications can be made as follows.
[0032]
(1) Although the contents of the frequency table are stored in the above embodiment, the
contents of the frequency table may be initialized when newly used in an entirely different
environment. In addition, when the upper limit is set to the possible value of "number of
occurrences", overflow is dealt with by performing processing such as halving the value of
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"number of occurrences" of all bands when the upper limit is exceeded. You may
[0033]
(2) In addition, although only one frequency table is used, for example, if you want to use it for
multiple environments, such as moving and using a room, you can prepare multiple frequency
tables. Good. In this case, the frequency table to be used may be selected according to the
environment. Further, although there are some karaoke apparatuses that have the function of
adding harmony to the input voice and converting the sound quality in recent karaoke
apparatuses, a plurality of tables for each function may be prepared. In this case, by using the
frequency table corresponding to the function selection, it is possible to cope with the difference
in the howling frequency due to the function change inside the karaoke apparatus.
[0034]
(3) The data recorded in the frequency table may have various recording methods. For example,
although the average value is used as the suppression level in the embodiment, the suppression
level may be indicated by another value. Furthermore, it is also possible to multiply an
experimentally obtained coefficient according to the conditions such as the size of the room.
[0035]
(4) Further, the frequency table may be divided and managed according to conditions such as
time lapse and the number of times of singing. For example, considering time lapse, the
frequency table up to 1 month before now is DT1, the frequency table up to 1 month to 2
months up is DT2, the frequency table more than 2 months up is DT3 etc. Manage the table
separately. When the data is used, the influence of the past data may be reduced. For example,
data of each frequency table is multiplied by a weighting factor, and the result of adding them is
used as a frequency result. The above coefficients may be set to 1 for DT1, 0.7 for DT2, and 0.5
for DT3. This makes it possible to always suppress howling according to the latest situation. In
addition, since the unnecessary attenuation amount due to the setting value recorded by the past
environment can be reduced, favorable results can be obtained for the sound quality.
[0036]
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(5) In the embodiment, information on occurrence of howling is stored using a table, but the
invention is not limited to this and, for example, a variable may be used. Also, time information
may be recorded. For example, as shown in FIG. 9, the update date and time is recorded for each
frequency number. Howling is suppressed according to the more recent situation by performing
data processing such as ignoring data updated after a certain period or applying a coefficient
that reduces the influence using this time data. May be In addition, since the unnecessary
attenuation amount due to the setting value recorded by the past environment can be reduced,
favorable results can be obtained for the sound quality.
[0037]
(6) Also, as in the embodiment, when the howling information is constantly recorded to change
the filter characteristics, it is conceivable that the frequency characteristics always change
depending on the condition where the howling occurs. In addition, when it is desired to fix the
frequency characteristic, or when the howling frequency is sufficiently learned by using the
signal a sufficient number of times, there is no need to change the frequency characteristic.
Therefore, in order to cope with these cases, a function of turning off the howling recording
means may be provided, and the on / off may be arbitrarily switched.
[0038]
(7) Further, in the embodiment, the device automatically suppresses the howling based on the
recorded information. However, based on the recorded contents of the howling recording unit
105, the second howling band suppression filter The characteristic of 102 may be set manually.
Such a modification can be similarly performed in the second embodiment. That is, step S28
shown in FIG. 8 can be deleted, and the same process can be performed manually. In this case,
means for displaying the information recorded in the howling recording means 105 may be
further provided to facilitate manual setting of the suppressing means.
[0039]
As described above, according to the present invention, since information concerning the
frequency at which howling occurred is recorded, howling is suppressed without deterioration of
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the sound quality according to the usage condition based on the recording. It is possible to
provide a howling suppression device that can be performed (claim 1). In addition, since howling
can be suppressed each time howling occurs, and the suppression level and the number of times
can be recorded, it is possible to prevent the occurrence of howling according to the howling
occurrence frequency and also suppress the howling that occurred. A possible howling
suppression device can be provided (claims 2 and 3). Further, since the characteristics of the
suppression means can be returned to the original state, it is possible to provide a howling
suppression device capable of preventing unnecessary suppression and performing howling
suppression according to the situation while maintaining the sound quality. (Claim 4). In addition,
since the characteristics of the howling suppression means are changed when no voice is input, it
is possible to provide a howling suppression device capable of preventing a sense of incongruity
or a deterioration in sound quality due to a change in frequency characteristics during singing.
Claim 5). Furthermore, in the case of having a plurality of suppression characteristics, it is
possible to select from among them and use it alone or in combination for howling suppression,
so a howling suppression device capable of suppressing howling corresponding to various
situations is provided. It can provide (Claim 6).
[0040]
Brief description of the drawings
[0041]
1 is a block diagram showing the configuration of a first embodiment.
[0042]
FIG. 2 is a block diagram showing a configuration of a howling cancellation unit.
[0043]
FIG. 3 is a flowchart showing the operation of the first embodiment.
[0044]
FIG. 4 is a diagram for explaining a first howling band suppression filter.
[0045]
FIG. 5 is a diagram showing an example of a frequency table.
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[0046]
FIG. 6 is a diagram for describing a second howling band suppression filter.
[0047]
FIG. 7 is a block diagram showing a configuration of a second embodiment.
[0048]
FIG. 8 is a flowchart showing an operation of the second embodiment.
[0049]
FIG. 9 is a diagram showing an example of a frequency table in which update dates and times are
recorded.
[0050]
Explanation of sign
[0051]
100 и и и Howling cancellation unit, 200 и и и и и и и и и и и и и data storage unit 400 и и и и song data
reproduction system, 101 и и first howling band suppression filter, 102 и и second howling band
suppression filter, 103 Howling frequency detection means, 104 иии First howling control means,
105 и и и Howling recording means, 106 и и и Second howling control means.
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