WO2006043367A1 - Dispositif de suppression d'effet larsen - Google Patents

Dispositif de suppression d'effet larsen Download PDF

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Publication number
WO2006043367A1
WO2006043367A1 PCT/JP2005/015723 JP2005015723W WO2006043367A1 WO 2006043367 A1 WO2006043367 A1 WO 2006043367A1 JP 2005015723 W JP2005015723 W JP 2005015723W WO 2006043367 A1 WO2006043367 A1 WO 2006043367A1
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WIPO (PCT)
Prior art keywords
howling
unit
signal
level
component
Prior art date
Application number
PCT/JP2005/015723
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English (en)
Japanese (ja)
Inventor
Takefumi Ura
Yoshiyuki Yoshizumi
Original Assignee
Matsushita Electric Industrial Co., Ltd.
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Filing date
Publication date
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Publication of WO2006043367A1 publication Critical patent/WO2006043367A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback

Definitions

  • the present invention relates to a howling suppression device that suppresses howling that occurs due to acoustic coupling between a speaker and a microphone in an acoustic device having a microphone and a speaker.
  • a conventional howling suppression device that suppresses this howling includes an input terminal 91 to which an acoustic signal is input, an analysis unit 92 that performs frequency analysis of the input acoustic signal, and a howling.
  • the input acoustic signal is divided into a plurality of frequency bands by the analysis unit 92, and for each band.
  • An absolute level is calculated.
  • howling occurrence is determined by the control unit 93 based on the peak value of the absolute level calculated by the analysis unit 92, so that the signal level of the band in which it is determined that noise or curling has occurred is reduced.
  • the coefficient is set by the control unit 93.
  • the acoustic signal whose howling is suppressed by the notch filter 94 is output via the output terminal 95.
  • the conventional howling suppression device detects a band where the signal level shows a peak as a band in which no ringing has occurred, and reduces the signal level in the detected band by using a notch filter. It was suppressed (see, for example, Patent Document 1).
  • Patent Document 1 JP-A-8-149593 (Page 5, Fig. 1)
  • the conventional howling suppression device detects howling based on the peak value of the absolute level of each frequency band of the acoustic signal, so that howling is performed on the signal level of the input acoustic signal.
  • the accuracy of detecting the occurrence of is dependent. Therefore, the conventional howling suppression device erroneously detects that howling has occurred when the background noise level is relatively high, or when speech is input, and so the accuracy of detecting the occurrence of howling is poor. There was a problem of becoming.
  • a conventional howling suppression device has a signal level applied to a notch filter in order to cope with changes in acoustic environment that affect howling occurs, such as changes in the position of microphones and speakers and the presence or absence of people and objects. Therefore, there is a problem that the voice deteriorates with the suppression of howling.
  • the present invention was made to solve the conventional problem, and detects the occurrence of howling more accurately than the conventional howling suppression device, and reduces sound quality deterioration due to howling suppression.
  • An object of the present invention is to provide a howling suppression device that can perform the above. Means for solving the problem
  • the howling suppression apparatus of the present invention includes a signal dividing unit that divides an acoustic signal into a plurality of components, a howling detection unit that detects occurrence of howling for each component divided by the signal dividing unit, and the howling.
  • a howling suppression unit that suppresses howling for each component in which howling is detected by the detection unit, and each component whose howling is suppressed by the howling suppression unit and the howling detection unit did not detect howling.
  • a signal synthesis unit that synthesizes each component.
  • the howling suppression apparatus of the present invention suppresses the knowling for each of the components divided into a plurality of components, and therefore detects the occurrence of howling more accurately than the conventional howling suppression apparatus, and howling It is possible to reduce deterioration in sound quality due to suppression of noise.
  • the howling detection unit represents a level calculation unit that calculates a signal level for each of a plurality of components divided by the signal division unit, and represents an average value of the signal levels
  • An average level calculation unit for calculating an average level, and a level for calculating a level ratio representing a ratio between the signal level and the average level for each component.
  • a ratio change calculation unit, a level change calculation unit for calculating a level change amount representing a time change amount of the signal level for each component, a level ratio calculated by the level ratio calculation unit, and the level change calculation unit And a howling determination unit that determines whether or not howling has occurred for each component based on the level change amount calculated by the above.
  • the howling suppression device of the present invention detects howling based on the level ratio and the amount of level change for each of the components divided into a plurality of components. It is possible to reduce erroneous detection of howling when a voice is input, and to detect occurrence of howling more accurately than a conventional howling suppression device.
  • the average level calculation unit may calculate the average level by excluding a signal level of a component whose band is lower than a predetermined frequency.
  • the howling suppression apparatus of the present invention calculates the average level by excluding the signal level of the component in the low frequency range where the background signal level of the background noise is large, so that the background noise level is relatively high. It is possible to reduce the erroneous detection of howling and to detect the occurrence of howling more accurately than the conventional howling suppression device.
  • the howling suppression unit measures the time interval at which occurrence of howling is detected by the howling detection unit for each component, and the measurement unit measures the time interval.
  • a gain calculating unit that calculates a gain for suppressing howling based on each of the time intervals, and each component divided by the signal dividing unit is multiplied by each gain calculated by the gain calculating unit.
  • a gain multiplication unit that uses the gain to calculate a gain for suppressing howling based on each of the time intervals, and each component divided by the signal dividing unit to be multiplied by each gain calculated by the gain calculating unit.
  • the howling suppression apparatus of the present invention calculates the gain for suppressing howling according to the time interval at which howling is detected, and thus excessively suppresses howling. Therefore, it is possible to reduce the deterioration of sound quality.
  • the howling suppression unit includes a storage unit that stores a gain calculated by the gain calculation unit, and the gain calculation unit includes a gain stored in the storage unit. May be configured to be the initial value.
  • the howling suppression apparatus of the present invention stores a gain that has converged to some extent and reads it as necessary, so that the howling suppression apparatus can be activated from a state in which howling is suppressed.
  • the signal dividing unit may divide the acoustic signal into a plurality of components by orthogonal transform.
  • the howling suppression device of the present invention suppresses howling for each component divided into a plurality of components in the frequency domain, and therefore detects the occurrence of knocking and curling more accurately than the conventional howling suppression device. At the same time, it is possible to reduce sound quality degradation caused by howling suppression.
  • the signal dividing unit may include a filter bank, and the acoustic signal may be divided into a plurality of components by the filter bank.
  • the howling suppression apparatus of the present invention suppresses howling for each component divided into a plurality of parts in the time domain, and thus detects the occurrence of howling more accurately than the conventional howling suppression apparatus. At the same time, it is possible to reduce sound quality degradation caused by howling suppression.
  • the howling detection unit may detect the occurrence of howling only for a part of the components divided by the signal dividing unit.
  • the howling suppression apparatus of the present invention has reduced the number of components that detect howling, so that the processing load required to detect howling can be reduced.
  • the howling suppression unit may suppress the howling only for a part of the components divided by the signal dividing unit.
  • the howling suppression apparatus of the present invention has reduced components that suppress howling, and therefore can reduce the processing load that contributes to howling suppression.
  • the howling suppression apparatus of the present invention is based on the result of detection by the howling detection unit. Based on the configuration, it has a display unit that displays the howling occurrence! / Speak.
  • the howling suppression apparatus of the present invention displays the howling occurrence state, thereby allowing the user to grasp the howling occurrence state visually.
  • the howling suppression device of the present invention includes a notification sound generation unit that generates a signal representing a notification sound for notifying the occurrence state of the howling based on a detection result by the howling detection unit.
  • the howling suppression apparatus of the present invention notifies the user of the howling occurrence status by listening to the notification sound by notifying the howling occurrence status using the notification sound.
  • the notification sound generation unit may generate a signal representing a different notification sound depending on a state of occurrence of the howling.
  • the howling suppression apparatus of the present invention notifies the state of howling occurrence in more detail by listening to the notification sound by notifying the state of occurrence of knowing with a different notification sound depending on the state of occurrence of howling. You can let the user know.
  • the howling suppression device of the present invention includes a device vibration unit that vibrates the howling suppression device to notify the occurrence state of the howling based on a detection result by the howling detection unit.
  • the howling suppression apparatus of the present invention can notify the user of the howling occurrence state by vibration by notifying the howling occurrence state by vibration.
  • the device vibration unit may apply different vibrations to the howling suppression device according to the occurrence state of the howling.
  • the howling suppression apparatus of the present invention notifies the user of the occurrence state of howling in detail by vibrating by notifying the occurrence state of knowing with vibrations that differ depending on the occurrence state of howling. It can be grasped.
  • the present invention detects the occurrence of howling more accurately than the conventional howling suppression device. At the same time, it is possible to provide a howling suppression apparatus having an effect of being able to reduce deterioration in sound quality due to howling suppression.
  • FIG. 1 is a block diagram of a howling suppression apparatus according to a first embodiment of the present invention.
  • FIG. 2 is a block diagram of a howling detection unit constituting the howling suppression apparatus according to the first embodiment of the present invention.
  • FIG. 3 is a block diagram of a howling suppression unit constituting the howling suppression device according to the first embodiment of the present invention.
  • FIG. 4 is a flowchart for explaining the operation of the howling suppression apparatus according to the first embodiment of the present invention.
  • FIG. 6 is a block diagram of a howling suppression apparatus according to a second embodiment of the present invention.
  • FIG. 7 is a block diagram of a howling suppression unit constituting the howling suppression device according to the second embodiment of the present invention.
  • FIG. 8 is a block diagram of a howling suppression apparatus according to a third embodiment of the present invention.
  • FIG. 9 is a block diagram of a howling suppression apparatus according to a fourth embodiment of the present invention.
  • FIG. 10 is a block diagram of a howling suppression apparatus according to a fifth embodiment of the present invention.
  • FIG. 11 is a block diagram of an audio device according to a sixth embodiment of the present invention.
  • FIG. 1 shows a howling suppression apparatus according to a first embodiment of the present invention.
  • the howling suppression device 1 is an input side device such as a microphone (not shown).
  • the signal divider 13 is a filter bank that divides an acoustic signal in a time domain such as a plurality of FIR (Finite Impulse Response) filters and bandpass filters such as IIR (Infinite Impulse Response) filters, or a polyphase filter.
  • the acoustic signal is divided into a plurality of components by this filter.
  • the signal dividing unit 13 may divide the acoustic signal into a plurality of components by performing orthogonal transformation on the acoustic signal to divide the acoustic signal in a frequency domain such as high-speed Fourier transform.
  • the signal synthesizing unit 16 is configured according to the manner in which the signal dividing unit 13 divides the acoustic signal so that the acoustic signal divided by the signal dividing unit 13 can be synthesized.
  • the howling detection unit 14 has an input terminal 21 to which a plurality of components divided by the signal division unit 13 are input, and a signal level of the plurality of components input to the input terminal 21.
  • a level calculation unit 22 that calculates the average level of the plurality of signal levels calculated by the level calculation unit 22, and a signal level calculated by the level calculation unit 22.
  • a level ratio calculation unit 24 that calculates a level ratio that represents the ratio of average levels calculated by the average level calculation unit 23 for each component, and an output signal that represents the signal level calculated by the level calculation unit 22 is delayed for each component. Delay time 25, and the signal level time based on the signal level represented by the output signal delayed by the delay device 25 and the signal level calculated by the level calculation unit 22.
  • the level change amount calculation unit 26 that calculates the level change amount representing the change amount for each component, the level ratio calculated by the level ratio calculation unit 24, and the level change amount calculated by the level change amount calculation unit 26 A howling determination unit 27 that determines whether or not howling has occurred for each component, and an output terminal 28 that outputs a determination result by the howling determination unit 27.
  • the noise suppression unit 15 includes an input terminal 31 to which a plurality of components divided by the signal dividing unit 13 are input, and a detection result by the howling detection unit 14 for each component.
  • Input terminal 32 a measurement unit 33 that measures the time interval at which the occurrence of howling was detected based on the detection result input to input terminal 32, that is, howling detection interval for each component, and measurement Based on each howling detection interval measured by the unit 33, a gain calculation unit 34 for calculating a gain for suppressing noise and curling for each component, and a gain calculation unit 34 for each component input to the input terminal 31
  • a gain multiplier 35 that multiplies the calculated gains and an output terminal 36 that outputs a plurality of components multiplied by the gains by the gain multiplier 35 to the signal synthesizer 16 are provided.
  • the gain calculating unit 34 considers that the closed loop gain is large and that howling repeatedly occurs, and determines the signal level. A large suppression gain is calculated.
  • the gain calculating unit 34 considers that the howling has converged, and avoids unnecessary sound quality degradation. The gain that suppresses this is calculated small.
  • the acoustic signal synthesized by the signal synthesizer 16 is DA-converted by the DA converter 17 (S6) and output via the output terminal 18 (S7).
  • the signal level of each component divided by the signal division unit 13 and input to the input terminal 21 is calculated by the level calculation unit 22. (S10).
  • an average level representing an average value of a plurality of signal levels calculated by the level calculation unit 22 is calculated by the average level calculation unit 23 (S11), and is calculated by the level calculation unit 22.
  • the level ratio calculating unit 24 calculates a level ratio representing the ratio between each signal level and the average level calculated by the average level calculating unit 23 (S12).
  • a level change representing a time change amount of the signal level is calculated by the level change amount calculation unit 26 (S 13).
  • Each signal level calculated by the level calculation unit 22 a predetermined time before is obtained by delaying the output signal representing each signal level calculated by the level calculation unit 22 by the delay unit 25.
  • howling determination unit 27 determines whether or not howling has occurred for each component based on the level ratio calculated by level ratio calculation unit 24 and the level change amount calculated by level change amount calculation unit 26. It is determined (S14).
  • the howling detection interval is measured for each component by the measurement unit 33 based on the result determined by the howling determination unit 27 (S15).
  • a gain for suppressing howling is calculated for each component by the gain calculation unit 34 based on the noise detection interval measured by the measurement unit 33 (S16).
  • step S14 determines howling determination unit 27 .
  • the level ratio calculated by the level ratio calculation unit 24 is compared with a predetermined first threshold value for each component, and when the level ratio exceeds the first threshold value, detection of howling occurs.
  • the first counter value force is incremented.
  • the level change amount calculated by the level change amount calculation unit 26 is compared with a predetermined second threshold value, and if the level change amount exceeds the second threshold value, howling occurs.
  • the second counter value force for detecting is incremented.
  • the average level calculation unit 23 has been described as calculating an average level representing an average value of a plurality of signal levels calculated by the level calculation unit 22, but the band is determined in advance. If the average level is calculated by excluding the signal level of the component lower than the obtained frequency, the signal level of the component is divided for each component, and the average level is calculated, and the level ratio calculating unit 24 The level ratio may be calculated for each component.
  • the howling detection unit 14 has been described as detecting the occurrence of howling for each component divided by the signal dividing unit 13, the occurrence of howling is generated for each component output from the howling suppression unit 15. Let's detect it.
  • the howling detection unit 14 performs a case where a component that generates howling is assumed in advance. In other words, it is possible to detect howling only for some of the components that are expected to generate howling, but to suppress howling only for some of the components that are expected to generate howling.
  • the gain calculation unit 34 has been described as calculating the gain according to the howling detection interval. However, when the occurrence of howling is not detected for a long time, the signal level is restored and the gain is reduced. Let's calculate it.
  • howling suppression apparatus 1 executes howling suppression unit 15 and another howling detection process, which may be configured by combining howling detection unit 14 and another howling suppression process. And may be combined.
  • FIG. 6 shows a howling suppression apparatus according to the second embodiment of the present invention.
  • howling suppression apparatus 2 includes an input terminal 11, an AD converter 12, a signal divider 13, a howling detector 14, and a component for which howling is detected by howling detector 14.
  • a howling suppression unit 41 that suppresses howling, a signal synthesis unit 16, a DA converter 17, and an output terminal 18 are provided.
  • howling suppression section 41 has input terminals 31 and 32, measurement section 33, and a gain for suppressing howling based on each howling detection interval measured by measurement section 33.
  • a gain calculation unit 42 calculated for each component, a storage unit 43 that stores the gain calculated by the gain calculation unit 34, a gain multiplication unit 35, and an output terminal 36 are provided.
  • the gain calculation unit 42 calculates the gain for each component based on the howling detection interval measured by the measurement unit 33. In addition, when the howling detection interval is long, that is, when the howling has converged, the calculated gain is stored in the storage unit 43 at a predetermined timing.
  • the gain calculation unit 42 for example, in the initial state immediately after power-on, the storage unit 43 The gain stored in is set as the initial value.
  • howling suppression operation of howling suppression apparatus 2 is set such that the gain multiplied by gain multiplication unit 35 is stored in storage unit 43 by gain calculation unit 42, and howling converges.
  • the howling suppression device 1 of the first embodiment of the present invention except that the gain calculated by the gain calculation unit 42 is stored in the storage unit 43.
  • the howling suppression apparatus 2 of the second embodiment of the present invention since the gain that has been converged to some extent is stored and read as necessary, the howling suppression apparatus 2 from the state of suppressing howling. Can be launched.
  • FIG. 8 shows a howling suppression apparatus according to the third embodiment of the present invention. Note that, in each configuration of the howling suppression apparatus 3 of the third embodiment of the present invention, the same components as those of the howling suppression apparatus 1 of the first embodiment of the present invention are denoted by the same reference numerals. The description is omitted.
  • howling suppression apparatus 3 generates howling based on the result of detection by howling detection section 14 in addition to the configuration of howling suppression apparatus 1 according to the first embodiment of the present invention.
  • a display unit 51 for displaying the situation is provided.
  • howling suppression device 3 configured as described above, howling occurrence power, such as which component generates the knowing, the display unit 5 with a color-coded diagram, characters, etc.
  • the howling suppression operation of the noise suppression device 3 is the same as the howling suppression operation of the howling suppression device 1 according to the first embodiment of the present invention, and a description thereof will be omitted.
  • FIG. 9 shows a howling suppression apparatus according to the fourth embodiment of the present invention.
  • howling suppression device 4 includes the configuration of howling suppression device 1 according to the first embodiment of the present invention, and howling occurs as a result of detection by howling detection unit 14.
  • a notification sound generating unit 61 that generates a signal representing a different notification sound according to the signal
  • an adding unit 62 that adds the signal representing the notification sound generated by the notification sound generating unit 61 to the acoustic signal synthesized by the signal synthesis unit 16 And prepare.
  • the operation of the howling suppression device 4 configured as described above will be described. Note that the howling suppression operation of the howling suppression device 4 is the same as the howling suppression operation of the howling suppression device 1 according to the first embodiment of the present invention, and a description thereof will be omitted.
  • a signal representing a different notification sound is generated by the notification sound generation unit 61 according to howling occurs, and a signal representing the notification sound is synthesized by the signal synthesis unit 16.
  • the addition unit 62 adds the sound signal.
  • the signal representing the notification sound is DA-converted by the DA converter 17 together with the acoustic signal synthesized by the signal synthesizer 16 and is output via the output terminal 18.
  • a howling occurrence state is notified by a notification sound, whereby a howling occurrence state is heard by listening to the notification sound. Can be grasped.
  • notification sound generation unit 61 generates a signal representing a different notification sound depending on howling occurs. For example, the occurrence of howling is detected.
  • the notification sound generation unit 61 may generate a signal indicating the only notification sound indicating that the occurrence of howling has been detected.
  • the adding unit 62 provided on the input side of the DA converter 17 adds the signal representing the notification sound generated by the notification sound generating unit 61 and the acoustic signal combined by the signal combining unit 16
  • the adder 62 is provided on the output side of the DA converter 17, and the adder 62 receives the signal representing the notification sound generated by the notification sound generator 61 and the sound signal DA-converted by the DA converter 17 Add ⁇ ⁇ .
  • FIG. 10 shows a howling suppression apparatus according to the fifth embodiment of the present invention. Note that in each configuration of the howling suppression apparatus 5 according to the fifth embodiment of the present invention, the same components as those of the howling suppression apparatus 1 according to the first embodiment of the present invention are denoted by the same reference numerals. The description is omitted.
  • a howling suppression device 5 generates a howling based on the result of detection by the howling detection unit 14 in consideration of the configuration of the howling suppression device 1 according to the first embodiment of the present invention.
  • a device vibration unit 71 is provided that applies different vibrations to the howling suppression device 5 depending on the situation.
  • the howling suppression operation of the noise suppression device 5 is the same as the howling suppression operation of the howling suppression device 1 according to the first embodiment of the present invention, and a description thereof will be omitted.
  • the howling suppression apparatus 5 of the fifth embodiment of the present invention by notifying the occurrence state of howling by vibration, the user can grasp the occurrence state of howling by vibration. Can do.
  • the force described as the device vibration unit 71 applies different vibrations to the knowing suppression device 5 depending on howling occurs, for example, only the occurrence of howling is detected.
  • the device vibration unit 71 may give the howling suppression device 5 only vibration indicating that the occurrence of howling has been detected.
  • FIG. 11 shows an acoustic device according to a sixth embodiment of the present invention.
  • the acoustic device 6 amplifies the acoustic signal representing the sound collected by the microphone 81, the microphone 81 that collects sound, the microphone 81 that collects sound according to the first embodiment of the present invention.
  • an acoustic signal representing the sound collected by the microphone 81 is amplified by the microphone amplifier 82 and input to the howling suppression apparatus 1. Howling suppression device 1
  • the acoustic signal output with the howling suppressed is amplified by the power amplifier 84, and the sound is output by the speaker 85 based on the acoustic signal amplified by the power amplifier 84.
  • howling suppression device 1 force can detect the occurrence of howling more accurately than the conventional howling suppression device, and can also reduce howling.
  • the gain of microphone amplifier 82 or power amplifier 84 that was limited by the occurrence of howling should be set large Can do.
  • the acoustic device 6 has been described as including the howling suppression device 1 according to the first embodiment of the present invention, but the acoustic device 6 is replaced with the howling suppression device 1. Then, any one of the howling suppression apparatus 2 according to the second embodiment of the present invention to the howling suppression apparatus 5 according to the fifth embodiment of the present invention may be provided.
  • the howling suppression apparatus can detect the occurrence of howling more accurately than the conventional howling suppression apparatus, and can reduce deterioration in sound quality due to suppression of howling.
  • the acoustic device having a microphone effect and a microphone is useful as a howling suppression device for suppressing howling generated by acoustic coupling between the speaker and the microphone.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

L'invention se rapporte à un dispositif de suppression d'effet Larsen détectant avec précision l'apparition d'effet Larsen lorsqu'il est comparé à des dispositifs classiques de suppression d'effet Larsen, et réduisant la dégradation de la qualité sonore liée à la suppression de l'effet Larsen. Le dispositif de suppression d'effet Larsen comprend une section de division du signal (13) destinée à diviser un signal acoustique en une pluralité de composantes, une section de détection d'effet Larsen (14) destinée à détecter l'apparition de l'effet Larsen pour chaque composante divisée par la section de division de signal (13), une section de suppression d'effet Larsen (15) destinée à supprimer l'effet Larsen de chaque composante pour laquelle est détectée l'apparition d'effet Larsen au niveau de la section de détection d'effet Larsen (14) et une section de synthèse de signal (16) destinée à synthétiser chaque composante pour laquelle est supprimé l'effet Larsen au niveau de la section de suppression d'effet Larsen (15) et chaque composante pour laquelle aucune apparition d'effet Larsen n'est détectée.
PCT/JP2005/015723 2004-10-19 2005-08-30 Dispositif de suppression d'effet larsen WO2006043367A1 (fr)

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EP2685746A1 (fr) * 2011-03-09 2014-01-15 Panasonic Corporation Dispositif de détection de réaction acoustique, dispositif de suppression de réaction acoustique et procédé de détection de réaction acoustique
EP2685746A4 (fr) * 2011-03-09 2014-10-22 Panasonic Corp Dispositif de détection de réaction acoustique, dispositif de suppression de réaction acoustique et procédé de détection de réaction acoustique
US9154874B2 (en) 2011-03-09 2015-10-06 Panasonic Intellectual Property Management Co., Ltd. Howling detection device, howling suppressing device and method of detecting howling

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