JP5333786B2 - Karaoke device and program for karaoke device - Google Patents

Karaoke device and program for karaoke device Download PDF

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JP5333786B2
JP5333786B2 JP2010151836A JP2010151836A JP5333786B2 JP 5333786 B2 JP5333786 B2 JP 5333786B2 JP 2010151836 A JP2010151836 A JP 2010151836A JP 2010151836 A JP2010151836 A JP 2010151836A JP 5333786 B2 JP5333786 B2 JP 5333786B2
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howling
audio signal
detection
processing
karaoke
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永介 山下
哲也 水谷
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ブラザー工業株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for sound signal processing having a howling suppression function such as a karaoke device which provides an effect similar to howling including that occurring by feedback technique of a guitar. <P>SOLUTION: The sound signal processing device according to the present invention comprises: first detection means 201 for detecting a howling occurrence state in surrounding sounds; second detection means 202 for detecting a howling occurrence state in an input second sound signal; sound processing means 204 for allowing execution of a howling suppression processing to an input first sound signal; control means 203 for controlling the sound processing means 204 so that the howling in the second sound signal is not suppressed based on results detected by the first detection means 201 and the second detection means 202. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

The present invention relates to a karaoke apparatus having a howling suppression function, and a program for a karaoke apparatus , and more particularly to an apparatus capable of enjoying a performance by connecting an external instrument such as an electric guitar.

  Conventionally, an acoustic device that collects sound from a microphone or the like and emits it with a loudspeaker such as a speaker causes positive feedback mainly due to the use environment, and causes a howling phenomenon that generates an annoying sound at a specific frequency. It is known. In order to suppress such a howling phenomenon, as disclosed in Patent Document 1, a frequency at which howling occurs is specified, and a component of the frequency is suppressed and output.

  On the other hand, Patent Document 2 proposes to provide an audio signal input means for inputting an audio signal from the outside and to connect an external instrument such as an electric guitar in a karaoke apparatus equipped with a sound source device for performing automatic accompaniment. . In such a karaoke apparatus, it is possible to add the performance of the user to the karaoke performance and output it.

  By the way, in an electric guitar (electric guitar), as described in Patent Document 3, it is known to provide an effect called a feedback performance method. This feedback playing method is a method of giving an effect of causing an oscillation at a predetermined frequency, like howling, by bringing an electric guitar close to a loud speaker and causing positive feedback between the strings, amplifier, and speakers of the guitar. Is the method.

JP 2005-102093 A JP 2000-89774 A JP-A-9-305168

  The karaoke apparatus is often used in a narrow space such as a karaoke box, and thus it is necessary to pay particular attention to howling. Therefore, the karaoke apparatus is equipped with a howling suppression function as described in Patent Document 1. In such a karaoke apparatus, when an electric guitar as in Patent Document 2 is connected to enjoy a user's performance, when the feedback performance technique is executed, the karaoke apparatus recognizes the feedback performance technique as occurrence of howling, and a howling suppression function. Will work. In such a case, the frequency characteristics and volume are changed, and the effect imparting by the feedback performance method is suppressed, and the sound quality of the singing voice input from the microphone is deteriorated.

  In view of such a situation, the present invention provides a sound that can give the effect of the feedback playing method without a sense of incongruity even when the feedback playing method by an external instrument is executed in an acoustic device such as a karaoke apparatus having a howling suppression function. It is an object of the present invention to provide a signal processing device and an audio signal processing program.

In order to solve the above problems, a karaoke apparatus according to the present invention includes a first detection means for detecting a howling occurrence state based on a first sound signal input from a microphone, and a second sound input from a guitar. second detecting means for detecting howling occurrence for the signal, a voice processing means for enabling executing the howling suppression processing for the first audio signal, the first audio signal and the second audio signal Based on the detection result of the first detection means and the detection result of the second detection means, and howling of the second audio signal included in the first audio signal. Control means for controlling the voice processing means so as not to suppress the noise.

Further, in the karaoke apparatus according to the present invention, the means for emitting the first audio signal and the second audio signal from the speaker causes the reproduction sound reproduced based on the music information to be emitted from the speaker. It is characterized by.

Furthermore, in the karaoke apparatus according to the present invention, the detection result of the first detection means is information indicating whether or not howling has occurred in the first audio signal, and the detection result of the second detection means. Is information indicating whether or not howling has occurred in the second audio signal, and the control means suppresses howling in the audio processing means when howling has occurred in the second audio signal. It is characterized by not letting the processing for.

Furthermore, in the karaoke apparatus according to the present invention, the detection result of the second detection means includes information indicating howling frequency occurring in the second audio signal, and the control means includes the second detection result. The frequency of howling included in the above is characterized in that the speech processing means is not allowed to perform processing for suppressing howling.

Furthermore, in the karaoke apparatus according to the present invention, the detection result of the first detection means includes information indicating howling frequency occurring in the first audio signal, and the control means includes the first audio detection It is characterized in that howling suppression processing is executed for a howling frequency included in the result and a howling frequency different from the howling frequency included in the second detection result.

Furthermore, the karaoke apparatus program according to the present invention is a karaoke apparatus program executed in a karaoke apparatus that emits a first audio signal and a second audio signal from a speaker, and is input from a microphone. A first step of detecting a howling occurrence state based on one sound signal, a second step of detecting a howling occurrence state of a second sound signal input from the guitar, and a detection result of the first detecting means And how to suppress the howling of the second audio signal included in the first audio signal , based on the detection result of the second detection means, so as not to suppress the howling of the second audio signal. The third step of performing is performed by a karaoke apparatus .

  According to the present invention, based on the detection result of the first detection means and the detection result of the second detection means, the audio processing means is controlled so as not to suppress the howling of the second audio signal, so that the second When an output signal from an electric guitar is adopted as the audio signal, no howling suppression processing by the audio processing means is applied to the effect of the feedback performance method, and no uncomfortable feeling is caused.

  Further, the first detection means detects the ambient sound howling occurrence state based on the first audio signal, so that it is not necessary to provide a microphone or the like for detecting the ambient sound howling occurrence state. Can be achieved.

  Further, the detection result of the first detection means and the detection result of the second detection means are used to determine whether or not howling has occurred, and to the sound processing means when howling has occurred in the second sound signal. By not performing the processing for suppressing howling, it is possible to simplify howling detection by the first and second detecting means and also simplify the control means for controlling the sound processing means. It becomes.

  Further, by specifying the frequency of howling occurring in the second audio signal and not allowing the audio processing means to perform processing for suppressing howling for the frequency, for example, howling due to the surrounding environment occurs. In particular, even when feedback performance is performed by an external musical instrument, it is possible to suppress only howling due to the surrounding environment.

  Furthermore, by specifying the howling frequency for the first audio signal as well, it is possible to effectively remove the howling due to the surrounding environment while leaving the effect of the feedback performance by the external musical instrument.

  Furthermore, the audio processing program of the present invention is based on the feedback performance method by preventing the howling of the second audio signal based on the detection result of the first detection means and the detection result of the second detection means. You can enjoy the performance without leaving a sense of incongruity. Moreover, by providing the program, it is possible to add this function to a computer device or an existing audio device.

The figure which shows the basic composition of the karaoke system which concerns on embodiment of this invention. The figure which shows the structural example of the audio | voice signal processing part which concerns on embodiment of this invention. The figure for demonstrating the howling suppression process which concerns on embodiment of this invention. The flowchart which shows the audio | voice signal processing which concerns on embodiment of this invention. The figure for demonstrating the howling suppression process which concerns on other embodiment of this invention. The flowchart which shows the audio | voice signal processing which concerns on other embodiment of this invention. The figure for demonstrating the howling suppression process which concerns on other embodiment of this invention. The flowchart which shows the audio | voice signal processing which concerns on other embodiment of this invention.

  The case where the audio | voice signal processing apparatus based on this invention is mounted in a karaoke system is demonstrated. FIG. 1 is a diagram illustrating a basic configuration of a karaoke system according to the embodiment.

  The main control unit 104 controls the commander 100 that forms the core of the karaoke system. Its main functions are control of the communication control unit 102 that communicates with an external communication network, control of the video control unit 103 that outputs a video signal such as a karaoke background video to an external display, and a sound source Control of the audio | voice control part 107 which controls the audio | voice signal for karaoke accompaniment, such as the part 108 and the audio | voice signal processing part 200, is performed.

  The present invention is particularly characterized in the control of the voice control unit 107. The sound control unit 107 controls the sound source unit 108 and the sound signal processing unit 200. The sound source unit 108 reads out music information corresponding to the music specified by the user through the input unit 101 from the hard disks 105 and 106 and causes the sound source unit 108 to reproduce the music information. The music information is data composed of MIDI data, MPEG audio data, and the like.

  The commander 100 includes a terminal for connecting a microphone 404, and can input a singing voice as a microphone sound signal. The input microphone sound signal is taken into the sound signal processing unit 200 via the microphone amplifier 109 and the AD converter 110, and after applying effects such as howling suppression processing and echo, it is output as a microphone sound processing signal. .

  In the present embodiment, a terminal for connecting an electric guitar 405 (external musical instrument) is further provided. The guitar sound signal output from the electric guitar 405 passes through the AD converter 111, and is taken into the audio signal processing unit 200, like the microphone sound signal. Is output.

  The mixing unit 112 adds the reproduction sound output from the sound source unit 108, the microphone sound processing signal output from the audio signal processing unit 200, and the guitar sound processing signal, and outputs an addition signal. The added signal is output to the outside through the DA converter 113 and the preamplifier 114, and is emitted from the speaker 402 by the external amplifier 401.

  Depending on the arrangement environment, the sound emitted from the speaker 402 may be collected from the microphone 404 to cause positive feedback and cause howling. Therefore, the audio signal processing unit 200 according to the present embodiment is provided with a function for suppressing howling.

  On the other hand, when feedback playing is performed with the electric guitar 405, the guitar sound is output from the speaker 402. Since the effect of the guitar sound by this feedback playing method has a characteristic having a peak in a narrow frequency range as in the howling, the conventional howling suppression function is recognized as howling and the howling suppression function is activated. . In this embodiment, even when a feedback performance is performed by the electric guitar 405, the audio signal processing unit 200 does not suppress the effect added to the guitar sound signal.

  FIG. 2 is a diagram illustrating a configuration example of the audio signal processing unit according to the embodiment of the present invention. In the present embodiment, the sound signal processing unit 200 receives a microphone sound signal (“first sound signal” in the present invention) and a guitar sound signal (“second sound signal” in the present invention). Based on the respective input signals, a microphone sound processing signal and a guitar sound processing signal are generated.

  The first detection unit 201 (“first detection unit” in the present invention) detects howling of ambient sounds based on the microphone sound signal, and outputs a detection result to the howling canceller control unit 203. In the present embodiment, a simple configuration of whether or not howling has occurred is employed as the howling occurrence state. In addition, as a configuration for detecting howling of ambient sounds, a microphone separately provided for howling detection may be used regardless of the microphone sound signal.

  FIG. 3 is a diagram for explaining howling suppression processing. FIG. 3A shows frequency characteristics when howling occurs. Here, it is determined that howling occurs when the level exceeds a predetermined threshold.

  The second detection unit 202 (“second detection means” in the present invention) detects howling of the guitar sound signal, that is, whether or not the feedback performance method is being executed. The second detection unit 202 can also detect howling occurrence by the same detection method as the first detection unit 201. In the present embodiment, the second detection unit 202 is configured to detect whether howling has occurred. Is used for simplification.

  The howling canceller 204 (“voice processing means” in the present invention) performs howling suppression processing on the microphone sound signal. Here, a simple configuration using a low-pass filter is employed. FIG. 3B shows frequency characteristics after performing howling suppression processing. When howling occurs due to the surrounding environment, it is possible to remove a howling component by operating a low-pass filter having the characteristics shown in the figure. This embodiment is effective when the frequency of howling due to the surrounding environment can be predicted to some extent. In this case, the frequency band F1 is removed and the sound quality is deteriorated, but the howling component due to the surrounding environment can be removed. Note that the howling canceller 204 is not limited to using a low-pass filter as described above, and various forms such as a volume-lowering one and a notch-filtering one can be adopted.

  The first processing unit 205 gives various sound effects such as an echo effect to the sound output from the howling canceller 204 and outputs it. In addition, the second processing unit 206 gives various effect effects such as a limiter and a wah to the guitar sound signal and outputs it. The sound effects and effect effects of the first and second processing units 205 and 206 may be controlled by the control information included in the music information and may be performed in synchronization with the progress of the music. The first and second processing parts 205 and 206 may be provided as necessary.

The audio signal processing unit 200 according to the embodiment of the present invention has been described above. However, these configurations may be realized by hardware, or may be realized by installing a program in hardware.

  The howling canceller control unit 203 controls the howling canceller 204 based on the detection result of the first detection unit 201 and the detection result of the second detection unit 202. The specific process will be described with reference to the flowchart of FIG.

  When the process is started, the first detection unit 201 and the second detection unit 202 monitor howling of the microphone sound signal and the guitar sound signal, respectively. If howling is not detected by the first detection unit 201 (S102), howling suppression processing in the howling canceller 204 is not executed (S106).

  On the other hand, when howling is detected by the first detection unit 201 and howling is not detected by the second detection unit 202 (S103), it can be determined that howling due to the surrounding environment has occurred and feedback performance is not being performed. Therefore, howling suppression processing in the howling canceller 204 is executed (S105), and howling generated due to the surrounding environment is suppressed.

  Further, when howling is detected by the first detection unit 201 and howling is also detected by the second detection unit 202 (S104), it is determined whether the feedback performance by the electric guitar 405 is being executed, and the howling canceller 204. Does not execute howling suppression processing by.

  As described above, in this embodiment, when the howling occurrence is detected by the second detection unit 202, that is, when the feedback playing technique is executed by the electric guitar 204 as an external musical instrument, the howling suppression processing by the howling canceller 204 is performed. Never executed.

  In the first embodiment, as a detection of howling occurrence in the first detection unit 201 and the second detection unit 202, a simple configuration that detects whether or not howling has occurred is adopted, and in the howling canceller 204, A simple configuration that executes a predetermined howling suppression process is adopted. However, in this embodiment, when the howling that occurs based on the surrounding environment and the howling by the feedback playing method occur at the same time, the feedback playing method is given priority, and the howling by the surrounding environment cannot be suppressed. End up.

  In the two embodiments to be described next, it is possible to cope with the case where howling based on the surrounding environment and howling based on the feedback performance method occur at the same time. Both configurations can be realized by the same configuration as that described with reference to FIGS. 1 and 2, but the detection results of the first detection unit 201 and the second detection unit 202, the operation of the howling canceller 204, and the howling canceller control unit. The point of control 203 is different.

  FIG. 5 is a diagram for explaining howling suppression processing in the second embodiment. This figure shows frequency characteristics when howling due to the surrounding environment and howling based on feedback performance occur simultaneously. FIG. 5A shows a situation when howling occurs, and FIG. 5B shows a situation after howling suppression processing.

  In the present embodiment, the second detection unit 202 that detects the howling occurrence state of the guitar sound signal described with reference to FIG. 2 outputs the howling occurrence frequency f2 as the howling occurrence state. Further, the howling canceller 204 can perform howling suppression processing so as to leave the detected howling occurrence frequency f2.

  That is, it is determined that howling due to the surrounding environment has occurred, and a predetermined howling suppression process (in this embodiment, low-pass filter processing is executed) is executed, but howling is detected by the second detection unit 202. In such a case, the howling canceller 204 is controlled so as not to suppress the howling occurrence frequency f2. In the present embodiment, by setting a band puff filter that allows the vicinity of the howling generation frequency f2 to pass, the howling generation frequency f2 by the feedback performance method is allowed to pass.

  FIG. 6 is a flowchart showing processing of the howling canceller control unit 203 in the second embodiment. When the process is started, howling is detected by the first detection unit 201 and the second detection unit 202. In particular, the second detection unit 202 specifies the howling generation frequency f2.

  The process when the first detection unit 201 does not detect howling (S208) and the process when the second detection unit 202 does not detect howling (S207) are the same as those in the first embodiment. In S <b> 204, it is determined whether or not the first detection unit 201 includes anything other than the howling occurrence frequency f <b> 2 specified by the second detection unit 202. If it is determined that it is included, howling suppression processing (S205) is executed so as to allow the howling occurrence frequency f2 to pass as described with reference to FIG. On the other hand, if it is determined that it is not included, there is a high possibility that the howling that has occurred is only due to the feedback performance technique, so control is performed so that the howling suppression processing by the howling canceller 204 is not executed (S206). .

  Thus, in the present embodiment, the howling occurrence frequency f2 of the guitar sound signal is detected, and the howling canceller 204 executes the howling suppression processing so as not to inhibit the howling occurrence frequency f2, and is based on the surrounding environment. Thus, it is possible to cope with the case where howling that occurs in the same manner and howling due to feedback performance occur simultaneously.

  Next, a third embodiment will be described with reference to FIGS. In the present embodiment, the first detection unit 201 outputs the howling occurrence frequency as the howling occurrence state, and the second detection unit 202 outputs the howling occurrence frequency f2 as the howling occurrence state.

  FIG. 7 is a diagram for explaining howling suppression processing in the third embodiment. This figure shows frequency characteristics when howling due to the surrounding environment and howling based on feedback performance occur simultaneously. FIG. 7A shows the situation when howling occurs, and FIG. 7B shows the situation after howling suppression processing.

Thus, when the howling by the surrounding environment and the feedback performance method occurs simultaneously, the first detection unit 201 specifies the two howling generation frequencies f1 and f2, and the second detection unit 202 specifies the howling generation frequency f2. Will be. In the present embodiment, since the howling generation frequency f2 by the feedback performance technique is specified by the second detection unit 202, the howling generation frequency f1 can be effectively removed by the howling canceller 204 while the howling generation frequency f2 remains. It is possible.

  Similar to FIG. 5A, FIG. 7A shows frequency characteristics in the case where howling due to the surrounding environment and howling based on the feedback performance occur simultaneously. FIG. 7B shows the frequency characteristics after applying the howling suppression process. In the present embodiment, both howling generation frequencies f1 and f2 are specified, and a notch filter (a band-pass filter having a high Q value) is applied to remove the howling frequency f1, and only f1 is effectively removed. In order to remove only howling due to the surrounding environment in this way, for example, frequencies other than howling due to the surrounding environment such as the band F1 shown in FIG. 3B and the bands F2 and F3 shown in FIG. It is possible to suppress deterioration of sound quality without being removed excessively.

  FIG. 8 is a flowchart showing processing of the howling canceller control unit 203 in the third embodiment. When the process is started, howling is detected by the first detection unit 201 and the second detection unit 202. In particular, in the present embodiment, howling frequencies f1 and f2 are specified by the first detection unit 201, and howling occurrence frequency f2 is specified by the second detection unit 202.

  The process (S308) when the first detection unit 201 does not detect howling is the same as in the first embodiment. In the present embodiment, since howling frequency f1 due to the surrounding environment is specified, when howling is not detected by the second detection unit 202 (S307), howling suppression processing for suppressing this howling frequency f1 is executed. The In the first and second embodiments described above, the predetermined howling suppression processing is performed. However, since the processing focused on the howling frequency f1 can be executed here, howling is effectively suppressed and sound quality is deteriorated. Can be suppressed.

  In S <b> 304, it is determined whether or not the first detection unit 201 includes anything other than the howling occurrence frequency f <b> 2 specified by the second detection unit 202. If it is determined that it is included, howling suppression processing (S305) for suppressing howling occurrence frequency f1 as described in FIG. 7B is executed. On the other hand, if it is determined that it is not included, there is a high possibility that the howling that has occurred is only due to the feedback performance method, and therefore, the howling suppression processing by the howling canceller 204 is controlled not to be executed (S306). .

  As described above, according to the present invention, in various audio equipment such as a karaoke apparatus having a howling suppression function, even when a user performs karaoke singing while connecting an external instrument, a performance peculiar to the external instrument such as a feedback performance method. There is no sense of incongruity with the singing voice without canceling the effect.

  Note that the present invention is not limited to these embodiments, and embodiments configured by appropriately combining the configurations of the respective embodiments also fall within the scope of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Commander (karaoke apparatus), 101 ... Input part, 102 ... Communication control part, 103 ... Video control part, 104 ... Main control part, 105, 106 ... Hard disk, 107 ... Audio | voice control part, 108 ... Sound source part, 109 ... Microphone amplifier, 110, 111 ... AD converter, 112 ... mixing unit, 113 ... DA converter, 114 ... preamplifier, 200 ... audio signal processing unit (audio signal processing device), 201 ... first detection unit, 202 ... second Detection unit, 203 ... Howling canceller control unit, 204 ... Howling canceller, 205 ... First processing unit, 206 ... Second processing unit, 401 ... Amplifier, 402 ... Speaker, 403 ... Display device, 404 ... Microphone, 405 ... Electric guitar (External instrument)

Claims (6)

  1. First detection means for detecting howling occurrence based on a first audio signal input from a microphone ;
    Second detection means for detecting howling occurrence with respect to a second audio signal input from the guitar ;
    And voice processing means for enabling the execution of the anti-feedback processing on the first audio signal,
    Means for emitting the first audio signal and the second audio signal from a speaker;
    Based on the detection result of the first detection unit and the detection result of the second detection unit, the audio processing unit is configured not to suppress howling of the second audio signal included in the first audio signal. And a control means for controlling.
    Karaoke equipment.
  2. The means for emitting the first audio signal and the second audio signal from a speaker causes the reproduction sound reproduced based on the music information to be emitted from the speaker . Karaoke equipment.
  3. The detection result of the first detection means is information indicating whether or not howling has occurred in the first audio signal,
    The detection result of the second detection means is information indicating whether or not howling has occurred in the second audio signal,
    3. The karaoke according to claim 1, wherein the control means does not cause the sound processing means to perform a process for suppressing howling when howling occurs in the second sound signal. 4. apparatus.
  4. The detection result of the second detection means includes information indicating the frequency of howling occurring in the second audio signal,
    4. The control unit according to claim 1, wherein the control unit does not cause the audio processing unit to perform processing for suppressing howling for a howling frequency included in the second detection result. 5. Karaoke apparatus as described in 1.
  5. The detection result of the first detection means includes information indicating the frequency of howling occurring in the first audio signal,
    The control means performs processing for suppressing howling on a howling frequency included in the first sound detection result and different from a howling frequency included in the second detection result. The karaoke apparatus according to claim 4.
  6. In a karaoke apparatus program executed in a karaoke apparatus that emits a first audio signal and a second audio signal from a speaker,
    A first step of detecting a howling occurrence state based on a first audio signal input from a microphone ;
    A second step of detecting howling occurrence with respect to a second audio signal input from the guitar ;
    Based on the detection result of the first detection means and the detection result of the second detection means, the first voice input so as not to suppress howling of the second voice signal included in the first voice signal. A third step of executing howling suppression processing on a signal is caused to be executed by a karaoke apparatus.
    A program for karaoke equipment .
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