JP6718599B2 - Karaoke equipment - Google Patents

Description

The present invention relates to a karaoke device capable of suppressing howling.

Conventionally, in a karaoke device, a feedback loop is formed by an audio signal output from a speaker being circulated and input into a microphone. This feedback loop may amplify sound in a specific frequency band and cause howling. The echo canceller described in Patent Document 1 suppresses howling by canceling the echo that causes a feedback loop. Further, the howling suppression apparatus described in Patent Document 2 detects a frequency band in which howling occurs and suppresses the level of an audio signal in the frequency band.

JP, 2014-121033, A JP, 2009-49921, A

However, when the karaoke apparatus has a method of canceling the echo like the echo canceling apparatus described in Patent Document 1, the echo given in the karaoke apparatus is deleted. As a result, the reverberation effect of the sound due to the echo cannot be obtained. Further, when the level of the frequency band in which howling occurs is suppressed in the input audio signal as in the howling suppression device described in Patent Document 2, a part of the input voice of the singer is suppressed together with howling. Will be done. As a result, the power spectrum of the voice of the singer changes, and the sound quality deteriorates.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a karaoke device capable of suppressing howling even when an echo is generated and preventing deterioration of sound quality. ..

The karaoke apparatus according to claim 1, wherein a voice receiving unit that receives input of singing information representing a singing voice of a singer and a frequency component of a sound represented by the singing information have a volume level that is equal to or higher than a predetermined threshold value. Frequency determining means for determining the frequency component of, the suppressing means for suppressing the specific frequency component determined by the frequency determining means, and the echo information representing the pseudo reverberant sound of the sound represented by the singing information, the suppressing means. By the echo generation means for generating from the singing information in which the specific frequency component is suppressed, the echo information, and the singing information in which the specific frequency component is not suppressed, to synthesize to produce synthetic sound information Synthesizing means for reproducing sound according to the synthesized sound information, and the threshold value is a first threshold value that is determined to determine whether or not howling is occurring, and howling is occurring. A second threshold value determined to determine whether or not there is a high possibility, and the frequency determination means sets a volume level equal to or higher than the first threshold value among frequency components of the sound represented by the singing information. It is determined whether or not there is a first frequency component that the user has, and whether or not there is a second frequency component having a volume level that is equal to or higher than the second threshold value among frequency components of the sound represented by the song information. When the frequency determining unit determines that the first frequency component is present, the suppressing unit suppresses the first frequency component, and the frequency determining unit determines that the first frequency component does not exist, and, when the second frequency component is determined to be present by said frequency determining means, said suppression means is characterized that you suppress the second frequency component.

The karaoke apparatus according to claim 2, wherein a voice receiving unit that receives input of singing information that represents a singing voice of a singer, and an echo that generates echo information that represents a pseudo-reverberation sound of a sound that the singing information represents from the singing information. Generating means, frequency determining means for determining a frequency component of a sound represented by the singing information, or frequency component of a sound represented by the echo information, a specific frequency component having a volume level of a predetermined threshold value or more; Suppressing means for suppressing the specific frequency component determined by the frequency determining means from the echo information, the echo information in which the specific frequency component is suppressed, and the singing information in which the specific frequency component is not suppressed And a reproducing means for reproducing a voice according to the synthesized sound information, and the threshold is determined to determine whether or not howling is occurring. The first threshold value and a second threshold value that is determined to determine whether or not howling is likely to occur, the frequency determining means, the frequency component of the sound represented by the singing information, Or, of the frequency components of the sound represented by the echo information, it is determined whether or not there is a first frequency component having a volume level equal to or higher than the first threshold value, and the frequency component of the sound represented by the singing information, or Of the frequency components of the sound represented by the echo information, it is determined whether or not a second frequency component having a volume level equal to or higher than the second threshold value is present, and the frequency determining means determines that the first frequency component is present. In this case, the suppressing unit suppresses the first frequency component, the frequency determining unit determines that the first frequency component does not exist, and the frequency determining unit determines that the second frequency component exists. If it is determined, the suppressing means, characterized that you suppress the second frequency component.

The karaoke apparatus according to claim 3 , further comprising: a calculator that calculates a volume level for each frequency component of the sound represented by the song information in a predetermined sampling period; and a threshold determiner that determines the second threshold, The threshold value determining means determines the second threshold value based on the maximum value of the volume level calculated by the calculating means.

The karaoke apparatus according to claim 4 , further comprising volume determining means for determining a volume level of a sound output by the karaoke apparatus, and correction means for correcting the second threshold value, wherein the volume level is increased by the volume determining means. If determined, the correction unit adds the increase amount of the volume level determined by the volume determination unit to the second threshold determined immediately before the volume level is determined to be large by the volume determination unit. The frequency determining means determines whether or not there is a third frequency component having a volume level equal to or higher than the correction threshold value among the frequency components of the sound represented by the singing information. When it is determined that the first frequency component does not exist and the frequency determining unit determines that the third frequency component exists, the suppressing unit suppresses the third frequency component. ..

In the karaoke apparatus according to the first or second aspect, since the specific frequency component is not suppressed in the singing information, the sound quality of the singing voice of the singer is not deteriorated. Further, since the specific frequency component of the echo information that easily causes howling is suppressed, the specific frequency component in which howling is generated or in which howling is likely to occur is suppressed. Thereby, howling can be suppressed and deterioration of sound quality can be prevented.

In the karaoke device according to claim 1 or 2 , the threshold value is a first threshold value that is determined to determine whether or not howling is occurring, and whether or not there is a high probability of howling is determined. And a second threshold determined to do so. The frequency determining means determines whether or not the frequency component of the sound represented by the singing information or the frequency component of the sound represented by the echo information has a first frequency component having a volume level equal to or higher than a first threshold value, It is determined whether or not the frequency component of the sound represented by the singing information or the frequency component of the sound represented by the echo information has a second frequency component having a volume level equal to or higher than the second threshold value. When the frequency determining unit determines that the first frequency component exists, the suppressing unit suppresses the first frequency component, the frequency determining unit determines that the first frequency component does not exist, and the frequency determining unit determines that the first frequency component does not exist. When it is determined that the two frequency components are present, the suppressing unit suppresses the second frequency component. This makes it possible to prevent howling from occurring and prevent deterioration in the sound quality of the singing voice of the singer. Further, even if howling occurs once, it is possible to suppress the howling thereafter and prevent deterioration of the sound quality of the singing voice of the singer.

A karaoke apparatus according to a third aspect of the present invention includes a calculation unit that calculates a volume level for each frequency component of the sound represented by the song information in a predetermined sampling period, and a threshold value determination unit that determines a second threshold value. The threshold value determining means determines the second threshold value based on the maximum value of the volume level calculated by the calculating means. As a result, it is possible to suppress the second frequency component having a high volume, which is likely to cause howling, and prevent howling from occurring.

A karaoke apparatus according to a fourth aspect of the present invention comprises volume determining means for determining the volume level of the sound output by the karaoke apparatus, and correction means for correcting the second threshold value. When the volume level is increased by the volume determination unit, the correction unit adds the increase amount of the volume level determined by the volume determination unit to the second threshold determined immediately before the volume level is newly determined by the volume determination unit. A correction threshold value is determined by adding. The frequency determining means determines whether or not there is a third frequency component having a volume level equal to or higher than the correction threshold value. When the frequency determining unit determines that the first frequency component does not exist and the frequency determining unit determines that the third frequency component exists, the suppressing unit suppresses the third frequency component. Accordingly, even when the volume is increased and the howling is likely to occur, it is possible to suppress the third frequency component that is likely to cause the howling and prevent the howling from occurring.

It is a block diagram showing the karaoke apparatus which concerns on one Embodiment of this invention. It is a block diagram showing the sound control part of the karaoke apparatus of this embodiment. It is a power spectrum showing an example when howling has occurred. It is a power spectrum showing an example when howling has not occurred. It is a schematic diagram for demonstrating the case where a correction threshold value is determined. It is a block diagram showing the sound control part of the karaoke apparatus of the 2nd modification.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[1. Configuration of karaoke device]
The karaoke apparatus of this embodiment will be described with reference to FIG. FIG. 1 shows the configuration of a karaoke device. The karaoke device includes a music reproducing device 1 and a remote control device 2 communicably associated with the music reproducing device 1.

The music reproducing device 1 includes a control unit 10 that executes a process for providing karaoke. The control unit 10 is connected to the memory 20, the storage unit 30, the operation processing unit 41, the video control unit 51, and the sound control unit 61. The memory 20 includes a ROM having a storage area for storing a program and a RAM having a storage area for temporarily storing information. The storage unit 30 stores a plurality of pieces of music information representing the sound of the music played in the karaoke device. The music information is information according to the MIDI (registered trademark) standard, and the pitch and the vocal length of the pitch are stored in association with each other in chronological order. The storage unit 30 also stores image information representing an image including a lyrics telop to be displayed on the monitor 52, a background image, and a graphic user interface (hereinafter, referred to as GUI).

The operation processing unit 41 is connected to the operation unit 42 for performing various operations on the music reproducing device 1. The operation unit 42 includes an operation knob arranged on the exterior panel of the music reproducing device 1 and a touch panel. When the operation unit 42 receives an operation by the user, the content of the operation is sent to the operation processing unit 41. The operation processing unit 41 receives the content of the operation performed by the user, and sends an electric signal indicating the content of the operation to the control unit 10.

The video control unit 51 is connected to a monitor 52 for displaying a video output by the music reproducing device 1. The monitor 52 displays an image sent from the image control unit 51 according to an instruction from the control unit 10. As an example, the monitor 52 is a liquid crystal panel, and displays the lyrics telop, the background image, and the GUI output by the video control unit 51 to the monitor 52.

The sound control unit 61 is connected to the singing microphone 62 and the speaker 63. The singing microphone 62 has a built-in analog-digital converter. The converter converts the sound input to the singing microphone 62 into digital information. The singing voice information that is the converted digital information is sent to the sound control unit 61. The sound control unit 61 synthesizes the singing voice information and the music information and sends them to the speaker 63. The speaker 63 generates a sound according to the sent information.

The communication unit 71 is a wireless communication module that has a wireless communication function that complies with the well-known wireless LAN communication standard, and that enables the remote control device 2 (described later) and the music playback device 1 to communicate with each other. As an example, the communication unit 71 is configured by Wi-Fi (registered trademark), Bluetooth (registered trademark), a module for infrared communication, or the like. Further, the router 3 is provided so as to be communicable with the communication unit 71, and the music reproducing device 1 can be connected to the network 4 via the router 3.

The remote control device 2 is a remote control device of the music reproducing device 1, and is a terminal device including any one of a karaoke navigation that is a karaoke dedicated terminal, a smartphone that has a remote control application installed and can be used as a remote control device, and a remote control device for karaoke. is there. The karaoke device of the present embodiment includes, as the remote control device 2, any one terminal device or a plurality of terminal devices. The remote control device 2 accepts a user's operation and sends an instruction according to the content of the operation to the music reproducing device 1.

The sound control unit 61 will be described in detail with reference to FIG. The sound control unit 61 includes a spectrum analysis circuit 610, an information distribution unit 611, an effect circuit 612, digital/analog converters (hereinafter, DAC) 615A, DAC 615B, and DAC 615C, a first mixer 616, and a second mixer 617. , And a music reproducing unit 618. Further, the effect circuit 612 includes an echo generation circuit 613 and a notch filter 614.

The spectrum analysis circuit 610 receives the singing voice information sent from the singing microphone 62 and calculates the spectrum. As an example, the spectrum is calculated by calculating the amount of energy of each frequency by Fourier analysis (hereinafter, FFT). When the spectrum is calculated, the spectrum information regarding the spectrum is sent to the control unit 10. The information distribution unit 611 distributes the singing voice information sent from the spectrum analysis circuit 610 into two and sends it to the effect circuit 612 and the DAC 615A. The DAC 614A converts the digital singing voice information into an analog singing voice signal. The singing voice signal converted by the DAC 614A is sent to the first mixer 616.

In the effect circuit 612, the echo generation circuit 613 receives the singing voice information. The echo generation circuit 613 generates echo information representing a pseudo reverberation sound of singing voice information. The echo generation circuit 613 generates delay sound information for generating a sound of singing voice information with a time difference of several hundreds of microseconds every several hundreds of microseconds. The echo generation circuit 613 determines the volume so that the delay sound information having a larger time difference from the singing sound information is attenuated, and generates echo information by synthesizing a plurality of pieces of delay sound information. When the echo information is generated by the echo generation circuit 613, it is sent to the notch filter 614. The notch filter 614 suppresses a specific frequency of the frequencies of the sound included in the echo information according to the suppression instruction sent from the control unit 10. The specific frequency is a frequency determined by the control unit 10 to have energy equal to or higher than the threshold value in the spectrum information compared with the threshold value. The threshold will be described later. The notch filter 614 sends the echo information in which the specific frequency is suppressed to the DAC 615B.

The DAC 615B converts the digital echo information into an analog echo signal. The echo signal converted by the DAC 614B is sent to the first mixer 616. The first mixer 616 synthesizes the singing voice signal and the echo signal to generate a singing acoustic signal. The singing sound signal generated by the first mixer 616 is sent to the second mixer 617.

The music reproducing unit 618 receives a reproduction instruction and music information from the control unit 10. The music reproducing unit 618 starts the reproduction process in accordance with the reproduction instruction, and reproduces the music information sent from the control unit 10 in time series. Specifically, the music reproducing unit 618 generates digital performance sound information by reproducing music information. The music reproducing unit 618 sends the performance sound information to the DAC 615C. The DAC 615C converts the digital performance sound information into an analog performance sound signal. The performance sound signal converted by the DAC 614C is sent to the second mixer 617. The 2nd mixer 617 synthesize|combines a singing sound signal and a performance sound signal, and produces|generates a synthetic sound signal. The synthesized sound signal generated by the second mixer 617 is sent to the speaker 63.

In FIG. 2, the volume adjusting unit including an amplifier for adjusting the volume may be provided at an arbitrary position on the transmission path of the information or the signal inside the acoustic control unit 61, and thus the description thereof will be omitted. As an example, a volume adjusting unit that adjusts the volume of the singing sound signal is provided between the first mixer 616 and the second mixer 617, and a volume that adjusts the volume of the performance sound signal between the DAC 615C and the second mixer 617. An adjusting unit is provided, and a volume adjusting unit that adjusts the volume of the synthesized sound signal is provided between the second mixer 617 and the speaker 63.

[About threshold]
The threshold will be described with reference to FIGS. 3 to 5 are graphs in which the horizontal axis represents the frequency axis f representing the pitch, and the vertical axis represents the power axis P representing the magnitude of energy for each frequency representing the pitch. The graph represented on the plane defined by the frequency axis f and the power axis P is a graph drawn by the spectrum information obtained by spectrum analysis of the singing voice information by the spectrum analysis circuit 610. Spectral analysis is performed every sampling period. The threshold includes a first threshold, a second threshold, and a correction threshold. The first threshold is a threshold representing the magnitude of energy determined to determine whether or not howling is occurring. The second threshold value is a threshold value that represents the magnitude of energy determined to determine whether or not the howling is likely to occur. The correction threshold is a threshold obtained by correcting the second threshold defined in the sampling period immediately before the user performs the volume increasing operation according to the volume increasing operation performed by the user. The second threshold value and the correction threshold value are determined by the control unit 10, and a determination method by the control unit 10 will be described with reference to FIGS. 4 and 5.

The first threshold will be described with reference to FIG. The first threshold value is a threshold value for determining whether or not howling is occurring, and is a value representing a preset energy level. The first threshold value is stored in the ROM of the memory 20 in advance. The power spectrum shown in FIG. 3 indicates that there is a frequency Af having energy equal to or higher than the first threshold value indicated by the dotted line. When the frequency having the energy equal to or higher than the first threshold is included in the spectrum information as illustrated in FIG. 3, the control unit 10 determines that howling is occurring.

The second threshold will be described with reference to FIG. The second threshold value is a threshold value for determining whether there is a high possibility of howling, and is determined according to the input singing voice information. It can be seen from FIG. 4 that the spectrum information does not include the frequency having the energy equal to or higher than the first threshold value for determining whether the howling has occurred. However, it can be seen that the frequency Bf included in the singing voice information has the maximum energy. Therefore, the energy value of the frequency Bf having the maximum energy is determined as the second threshold value. That is, the second threshold value is determined by the maximum energy value for each sampling period in order to determine whether or not the frequency is a frequency at which howling is likely to occur.

The correction threshold will be described with reference to FIG. The correction threshold is determined when the operation unit 42 receives an operation for increasing the volume. In FIG. 5, the graph indicated by the alternate long and short dash line, the graph indicated by the broken line, and the graph indicated by the solid line are overlapped.

First, the graph indicated by the alternate long and short dash line represents the spectrum information that is the result of the spectrum analysis of the singing voice information immediately before the operation unit 42 receives the operation of increasing the volume. Then, the maximum value of the energy of the graph indicated by the alternate long and short dash line is the "second threshold value determined immediately before".

Next, the graph indicated by the broken line represents spectrum information that is the result of spectrum analysis of the singing voice information at the time when the operation unit 42 accepts the operation of increasing the volume. That is, the graph shown by the broken line represents the spectrum information at the time when the volume is increased. Then, the maximum value of energy in the graph indicated by the broken line is the "original second threshold value".

Lastly, the graph indicated by the solid line represents the spectrum information predicted when the spectrum information immediately before the operation unit 42 accepts the operation for increasing the volume is increased by the operation. Specifically, the predicted spectrum information is generated by adding the amount of increase in energy determined according to the operation amount, which is the amount of operation for increasing the volume received by the operation unit 42, to the immediately preceding spectrum information. That is, the graph indicated by the solid line is a graph obtained by moving the graph indicated by the one-dot chain line upward by the amount of increase in energy. Then, the maximum value of energy in the graph indicated by the solid line is the “correction threshold”.

In FIG. 5, the increase amount is added to all the frequencies of the spectrum indicated by the one-dot chain line, but the “correction threshold” is calculated by the control unit 10 by adding the increase amount to the maximum value. That is, the threshold value corrected by adding the increase amount to the “second threshold value determined immediately before” is the “correction threshold value”.

[Operations of Control Unit 10 and Acoustic Control Unit 61]
The control unit 10 determines whether or not the frequency having the energy equal to or higher than the threshold value is included in the spectrum information sent from the spectrum analysis circuit 610. When the control unit 10 determines that the frequency having the energy equal to or higher than the threshold value is included, the determined specific frequency is suppressed by the notch filter 614 of the effect circuit 612. Specifically, the control unit 10 determines whether or not the frequency at which the howling is occurring is included according to the spectrum information and the first threshold value. The case where the control unit 10 determines that the spectrum information includes the frequency having the energy equal to or higher than the first threshold value corresponds to the case where the control unit 10 determines that the frequency where the howling is generated is included. When the control unit 10 determines that the frequency at which the howling is generated is included, the control unit 10 sends an instruction to suppress the energy at the frequency at which the howling is generated to the notch filter 614. The notch filter 614 suppresses the energy of the frequency at which the howling is generated according to the instruction of the control unit 10.

When the control unit 10 determines that the spectrum information does not include a frequency having energy equal to or higher than the first threshold value as illustrated in FIG. 5, howling is performed according to the spectrum information and the original second threshold value or the correction threshold value. It is determined whether or not a frequency that is likely to occur is included. In the case shown in FIG. 4, the second threshold indicated by the chain double-dashed line corresponds to the original threshold. When the control unit 10 determines that the spectrum information includes the frequency having the energy equal to or higher than the original second threshold value or the correction threshold value, the control unit 10 determines that the frequency in which the howling is likely to occur is included. It is equivalent to the case determined by. When the control unit 10 determines that a frequency with a high probability of howling is included, the control unit 10 sends an instruction to the notch filter 614 to suppress energy of a frequency with a high probability of howling. The notch filter 614 suppresses energy of a frequency at which howling is likely to occur according to an instruction from the control unit 10.

[Effect of Embodiment]
By providing the notch filter 614 in the effect circuit 612, it is possible to suppress howling, which is mainly caused by the sound represented by the echo information, and also to suppress energy at a frequency at which howling is likely to occur. Further, since the energy of the specific frequency is suppressed only from the echo information, the specific frequency included in the sound representing the user's voice is not suppressed from the singing voice information, so howling can be suppressed without degrading the sound quality.

The correction threshold is a threshold for determining whether or not there is a frequency in which the volume is increased more than the volume increased in accordance with the operation when the operation unit 42 receives the operation to increase the volume. That is, the correction threshold is a threshold for determining an unexpected increase in volume. Since howling occurs due to continuous occurrence of this unexpected volume increase, the control unit 10 determines whether or not the volume is equal to or higher than the correction threshold value, so that the howling prevention effect can be enhanced.

Specifically, when the volume is increased according to the operation of increasing the volume by the user, the singing microphone 62 easily receives the input of the sound emitted by the speaker 63. As a result, positive feedback is likely to occur in the singing microphone 62 and the speaker 63. Since the main cause of howling is the positive feedback generated in the singing microphone 62 and the speaker 63, howling is likely to occur. Further, as the volume is determined to be larger, the amplification amount of the input sound is larger, so that the period in which the volume is diverged is shorter. Therefore, the howling prevention effect can be enhanced by determining an unpredictable increase in sound volume depending on whether or not the correction threshold value is exceeded.

[First Modification]
The second threshold is a threshold for determining whether or not howling is likely to occur. Therefore, the second threshold does not have to be determined by the maximum energy value among the energies of the frequencies included in the spectrum information. Several cases will be illustrated. As an example in which the second threshold value is not the maximum energy value, the second threshold value may be determined according to the number of frequencies at which the notch filter 614 can simultaneously suppress energy among the frequencies of the spectrum information. Specifically, when the notch filter 614 has a function of simultaneously suppressing the energy of five frequencies of the spectrum information, the value of the fifth largest energy is determined as the second threshold value. When the fifth largest energy value is determined as the second threshold value, the control unit 10 determines that the spectrum information includes five frequencies having energies equal to or higher than the second threshold value. The notch filter 614 suppresses the energy of the five frequencies having the energy equal to or higher than the second threshold, which is determined by the control unit 10. Further, a volume value considered to have a high possibility of howling may be determined by the administrator, and the determined volume value may be determined as the second threshold value.

[Second Modification]
In the present embodiment, the notch filter 614 suppresses the specific frequency determined by the control unit 10 as the frequency having the energy equal to or higher than the threshold value from the frequency of the sound included in the echo information sent from the echo generation circuit 613. However, as shown in FIG. 6, the notch filter 614 may be provided between the information distribution unit 611 and the echo generation circuit 613. That is, the notch filter 614 suppresses the specific frequency determined by the control unit 10 as the frequency having the energy equal to or higher than the threshold value from the frequency of the sound included in the singing voice information sent from the information distribution unit 611. The singing voice information in which the specific frequency is suppressed is sent from the notch filter 614 to the echo generation circuit 613. As a result, it is possible to suppress a frequency at which howling occurs before generating echo information or a frequency at which howling is likely to occur. In particular, when howling is occurring, it is possible to avoid that the correct reverberation sound cannot be generated by generating the howling reverberation sound as echo information.

[Third Modification]
In the present embodiment, the spectrum analysis circuit 610 executes spectrum analysis of singing voice information. However, the spectrum analysis circuit 610 may perform spectrum analysis of the echo information. That is, in FIG. 2, the spectrum analysis circuit 610 may be provided between the echo generation circuit 613 and the notch filter 614. The spectrum analysis circuit 610 executes the spectrum analysis of the echo information and sends the spectrum information regarding the echo information to the control unit 10. The control unit 10 determines the frequency at which howling is occurring or the frequency at which howling is likely to occur, based on the transmitted spectrum information and the threshold value. The determination method is the same as that of the embodiment, and therefore its explanation is omitted. When the frequency in which the howling is generated or the frequency in which the howling is likely to be included is included, the control unit 10 sends an instruction to suppress the energy of the frequency to the notch filter 614. The notch filter 614 suppresses the energy of the frequency according to the sent instruction.

[Fourth Modification]
In the present embodiment, the control unit 10 controls all operations of the music reproducing device 1, calculates the threshold value, and determines whether the energy of each frequency is equal to or more than the threshold value. Instead of the general-purpose control unit described above, a dedicated control unit that only calculates the threshold value and determines whether or not the threshold value is greater than or equal to the control unit that controls all the operations of the music reproducing device 1 may be provided. ..

[Correspondence between Claims and Description of Embodiment]
The singing microphone 62 is an example of a voice receiving unit. The control unit 10 is an example of frequency determining means. The notch filter 614 is an example of the suppressing unit. The effect circuit 612 is an example of the echo generating means. The second mixer 617 is an example of a combining unit. The speaker 63 is an example of a reproducing unit. The spectrum analysis circuit 610 is an example of a calculation unit. The energy value for each frequency calculated by the spectrum analysis circuit 610 is an example of the volume level. The control unit 10 is an example of a threshold value determining unit. The operation unit 42 is an example of a sound volume determining unit. The control unit 10 is an example of a correction unit. The frequency determined by the control unit 10 to have energy equal to or higher than the first threshold is an example of the first frequency component. The frequency determined by the control unit 10 to have energy equal to or higher than the second threshold and not equal to or higher than the first threshold is an example of the second frequency component. The frequency determined by the control unit 10 to have energy equal to or higher than the correction threshold and not equal to or higher than the first threshold is an example of the third frequency component.

DESCRIPTION OF SYMBOLS 1 Karaoke device 2 Remote control device 10 Control part 42 Operation part 61 Sound control part 62 Singing microphone 63 Speaker 610 Spectral analysis circuit 612 Effect circuit 613 Echo generation circuit 614 Notch filter 615 DAC
616 First mixer 617 Second mixer 618 Music reproducing unit

Claims (4)

A voice receiving means for receiving input of singing information representing a singing voice of a singer,
Of the frequency components of the sound represented by the singing information, frequency determining means for determining a specific frequency component having a volume level equal to or higher than a predetermined threshold,
Suppressing means for suppressing the specific frequency component determined by the frequency determining means,
Echo information representing pseudo reverberation of the sound represented by the singing information, echo generation means for generating from the singing information in which the specific frequency component is suppressed by the suppressing means,
Synthesizing means for synthesizing the echo information and the singing information in which the specific frequency component is not suppressed, and generating synthetic sound information,
A reproducing means for reproducing a voice according to the synthesized voice information ,
The threshold is
A first threshold determined to determine whether howling is occurring,
A second threshold determined to determine whether howling is likely to occur,
The frequency determination means,
Of the frequency components of the sound represented by the singing information, it is determined whether or not there is a first frequency component having a volume level equal to or higher than the first threshold value,
Of the frequency components of the sound represented by the song information, it is determined whether or not there is a second frequency component having a volume level equal to or higher than the second threshold value,
When the frequency determining unit determines that the first frequency component is present, the suppressing unit suppresses the first frequency component,
When the frequency determining unit determines that the first frequency component does not exist and the frequency determining unit determines that the second frequency component exists, the suppressing unit suppresses the second frequency component. <br/> A karaoke device characterized by the following. A voice receiving means for receiving input of singing information representing a singing voice of a singer,
Echo generation means for generating from the singing information echo information that represents a pseudo-reverberant sound of the sound that the singing information represents,
Frequency component of the sound represented by the singing information, or frequency component of the sound represented by the echo information, a frequency determination means for determining a specific frequency component having a volume level of a predetermined threshold or more,
Suppressing means for suppressing the specific frequency component determined by the frequency determining means from the echo information,
The echo information in which the specific frequency component is suppressed, and the singing information in which the specific frequency component is not suppressed, and a synthesizing unit that generates synthetic sound information,
A reproducing means for reproducing a voice according to the synthesized voice information ,
The threshold is
A first threshold determined to determine whether howling is occurring,
A second threshold determined to determine whether howling is likely to occur,
The frequency determination means,
Of the frequency components of the sound represented by the singing information, or among the frequency components of the sound represented by the echo information, it is determined whether or not there is a first frequency component having a volume level equal to or higher than the first threshold value,
Of the frequency components of the sound represented by the song information, or the frequency components of the sound represented by the echo information, it is determined whether or not there is a second frequency component having a volume level equal to or higher than the second threshold value,
When the frequency determining unit determines that the first frequency component is present, the suppressing unit suppresses the first frequency component,
When the frequency determining unit determines that the first frequency component does not exist and the frequency determining unit determines that the second frequency component exists, the suppressing unit suppresses the second frequency component. <br/> A karaoke device characterized by the following. Calculation means for calculating a volume level for each frequency component of the sound represented by the singing information in a predetermined sampling period;
Threshold determining means for determining the second threshold,
The karaoke apparatus according to claim 1 , wherein the threshold value determining unit determines the second threshold value based on a maximum value of the volume level calculated by the calculating unit. A volume determining unit that determines a volume level of a sound output from the karaoke device; and a correcting unit that corrects the second threshold,
When the volume level is determined to be high by the volume level determining unit, the correcting unit sets the volume level determined by the volume level determining unit to the second threshold value determined immediately before the volume level is largely determined by the volume level determining unit. Determine the correction threshold by adding the increase amount of
The frequency determining means determines whether or not there is a third frequency component having a volume level equal to or higher than the correction threshold value among frequency components of the sound represented by the song information,
When the frequency determining unit determines that the first frequency component does not exist and the frequency determining unit determines that the third frequency component exists, the suppressing unit suppresses the third frequency component. The karaoke device according to claim 3 , wherein the karaoke device is a karaoke device.