JP4888163B2 - Karaoke equipment - Google Patents

Description

  The present invention relates to a karaoke apparatus that mixes a singer's voice collected by a microphone and a music sound generated by a music sound source and emits the sound from a speaker, and more particularly to a karaoke apparatus that maintains good acoustic characteristics.

Currently, there are various environments where ordinary people can easily enjoy music. One example is a karaoke box. In a karaoke box, a microphone used by a singer and a speaker that emits sound collected by a microphone, music sound of karaoke performance, and the like are installed in a closed space that is not so large. In such an environment, there is an acoustic characteristic that is unique to the environment and may have an acoustic characteristic that is not preferred by the user. In such an environment, a closed loop of sound transmission is formed, and the signal level in a specific frequency band becomes extremely high, and howling may occur. For these problems, an equalizer is installed in a karaoke apparatus or the like, and the acoustic characteristics are corrected by the equalizer. For example, Patent Document 1 sets an equalizer so as to attenuate a signal level in a frequency band that is howling, and Patent Document 2 performs correction of audio characteristics, but the characteristics after correction are extreme. The correction level and the correction frequency band are appropriately set by the operator so as not to become a problem.
JP-A-8-84394 Japanese Unexamined Patent Publication No. 7-38988

  However, in the acoustic characteristic correction system described above, it is possible to correct the acoustic characteristic with very high accuracy, but the equalizer for correcting the acoustic characteristic is a cascade connection of multi-stage PEQ (parametric equalizer), An arithmetic unit requiring complicated arithmetic processing is used, and the system becomes expensive. On the other hand, in order to keep the system at a low price, the amount of resources must be reduced, and the amount of resources that can be used for equalization is inevitably limited. Therefore, for example, in an equalizer formed by cascading PEQs, the number of stages is reduced, and the number of peaks that can be suppressed and the number of dips that can be increased are limited.

  Accordingly, an object of the present invention is to provide a karaoke apparatus that realizes an acoustic environment that does not cause discomfort to the user at a low cost by realizing a certain level of comfortable acoustic environment and reliably preventing howling. There is.

  The present invention mixes a microphone that collects a singing voice of a singer and generates a sound collection signal, a music sound source that reproduces music data and generates a music sound signal, and the sound collection signal and the music sound signal. Thus, the present invention relates to a karaoke apparatus including a mixing unit that generates a sound emission signal and a speaker that emits sound into a predetermined space based on the sound emission signal.

  The karaoke apparatus according to the present invention is a first fixed unit that is inserted between the mixing means and the speaker and performs peak suppression and dip enhancement on a desired acoustic characteristic of a system characteristic from the speaker to the microphone that is measured in advance. Equalizing means, second fixed equalizing means that is inserted between the microphone and the mixing means and is not corrected by the first fixed equalizing means, and that only performs peak suppression of the frequency characteristics of the collected sound signal, music sound source, and mixing means And a sound source tone controller operable to adjust the frequency characteristic of the music sound signal with the sound source specific correction characteristic. The karaoke apparatus according to the present invention has the sound source specific correction characteristic if the peak or dip frequency band that is not corrected by the first fixed equalizing means and the second fixed equalizing means matches the frequency band of the sound source specific correction characteristic. The correction amount to the peak and dip corresponding to the frequency band of is set as the initial value of the sound source specific correction characteristic.

  In this configuration, the first fixed equalizing means corrects the acoustic characteristics of the entire room including the collected sound (singing sound) and the music sound to be close to the desired acoustic characteristics. That is, the first correction value for suppressing the peak or increasing the dip is detected by detecting a portion (peak) where the acoustic characteristic of the entire room is higher than the desired acoustic characteristic and a concave portion (dip). Set to fixed equalizing means. Further, the second fixed equalizing means corrects the characteristic of the portion related to the collected sound in the acoustic characteristic of the room to be close to the desired acoustic characteristic. That is, when the correction is completed by the first fixed equalizing means, a peak in which the acoustic characteristic of the collected voice rises with respect to the desired acoustic characteristic is detected, and a correction value for suppressing the peak is set as the second fixed equalizing means. Set to. At this time, since the resources of the first and second fixed equalizing means are limited in an inexpensive system, all the peaks and dip may not be corrected. For this reason, in the present application, the tone frequency controller for the sound source that can be intentionally adjusted by the user equipped in the karaoke apparatus is used, and the adjustment frequency band of the sound source specific correction characteristic of the tone controller for the sound source When it is detected that the peak and dip frequency bands cannot be adjusted, the initial value (default value) of the sound source characteristic correction characteristic is used to correct the peak and dip that cannot be adjusted.

  Further, the karaoke apparatus of the present invention includes an operable microphone tone controller that is connected between the second fixed equalizing means and the mixing means and adjusts the frequency characteristic of the collected sound signal with the specific correction characteristic for microphone. Then, the karaoke apparatus of the present invention has the frequency of the specific correction characteristic for microphone if the peak frequency band not corrected by the first fixed equalizing means and the second fixed equalizing means matches the frequency band of the specific correction characteristic for microphone. The correction amount to the peak corresponding to the band is set as an initial value of the specific correction characteristic for microphone.

  In this configuration, a microphone tone controller that can be used to intentionally adjust the characteristics of a user equipped in the karaoke apparatus is used, and the adjustment frequency band of the microphone specific correction characteristics of the microphone tone controller is the above-described adjustment frequency band. When it is detected that the frequency band of the peak that cannot be adjusted is matched, the initial value (default value) of the characteristic correction characteristic for microphone is used for correcting the peak that cannot be adjusted.

  Further, the karaoke apparatus according to the present invention includes an adaptive equalizing means that is inserted between the microphone and the mixing means and suppresses a difference value peak caused by an environmental change caused by an acoustic characteristic that is not corrected by the first fixed equalizing means. It is characterized by having prepared.

  Further, the karaoke apparatus of the present invention suppresses a peak that is inserted between the microphone and the mixing means and is not corrected by the first fixed equalizing means and the second fixed equalizing means, and is caused by the environmental change caused by the acoustic characteristics. It is characterized by having adaptive equalizing means.

  In these configurations, the acoustic characteristics in the default state of the room are obtained by correcting according to the first fixed equalizing means, the second fixed equalizing means, the initial value of the tone controller for sound source, and the initial value of the tone controller for microphone. Is brought close to the desired acoustic characteristics including howling prevention, and further, howling caused by the change from the default state is suppressed by the adaptive equalizing means. Thereby, a singer and a user can enjoy karaoke comfortably, without giving discomfort to users, such as a singer.

  According to the present invention, it is possible to realize a karaoke apparatus that allows a user to comfortably perform karaoke by making the acoustic characteristics of a room close to desired acoustic characteristics while preventing howling while having a low-cost and simple configuration. .

A karaoke apparatus according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of the karaoke apparatus of the present embodiment.
FIG. 2 shows a system for setting initial parameters (default values) of the fixed sound equalization processing unit 12, the fixed microphone equalizing processing unit 18, the tone controller 42 for the sound source, and the tone controller 41 for the microphone shown in FIG. FIG.
FIG. 3 is a diagram showing frequency characteristics adjusted by the tone controller 42 for sound source and the tone controller 41 for microphone.

  As shown in FIG. 1, the karaoke apparatus of the present embodiment includes a CPU 11, a sound emission fixed equalizing processing unit 12, a D / A converter 13, a power amplifier 14, a speaker 15, a microphone 16, an A / D converter 17, and a microphone. A fixed equalizing processing unit 18, an echo processing unit 19, a microphone tone controller 41, a mixer 20, a sound source (music source) 30, and a sound source tone controller 42.

  The sound source 30 generates a digital music sound signal based on the music data of the karaoke music stored in advance in the server or the like, and outputs it to the tone controller 42 for the sound source.

The tone controller for sound source 42 includes an adjustment circuit including a graphic equalizer, a PEQ (parametric equalizer), or an analog equalizer, and adjusts the frequency characteristics using the adjustment circuit. The tone generator tone controller 42 includes operation means such as buttons and volumes, and adjusts the frequency characteristics of the music sound signal by an operation input from a user (singer or the like). As shown in FIG. 3, the tone controller 42 for the sound source divides and sets the entire frequency band of about 20 Hz to about 20 kHz into three adjustment frequency bands consisting of a low band, a middle band, and a high band. On the other hand, the configuration is such that the enhancement adjustment setting and the suppression adjustment setting are possible. When the low-frequency enhancement adjustment is input, the tone generator controller 42 sets parameters of the adjustment circuit so as to realize the “LOW +” adjustment frequency characteristic shown in FIG. 3 and the low-frequency suppression adjustment is input. Then, parameters of the adjustment circuit are set so as to realize the “LOW-” adjustment frequency characteristic shown in FIG. Further, when the mid-range enhancement adjustment is input, the tone generator tone controller 42 sets parameters of the adjustment circuit so as to realize the “MID +” adjustment frequency characteristics shown in FIG. Then, the parameters of the adjustment circuit are set so as to realize the “MID−” adjustment frequency characteristic shown in FIG. Furthermore, when the high frequency enhancement adjustment is input by operation, the tone controller 42 for the sound source sets the parameters of the adjustment circuit so as to realize the “HI +” adjustment frequency characteristic shown in FIG. Then, the parameters of the adjustment circuit are set so as to realize the “HI−” adjustment frequency characteristic shown in FIG. If no operation input is made, the tone generator controller 42 outputs the music sound signal to the mixer 20 without adjusting it.
Further, when the initial parameter is given from the CPU 11 by a method described later, the tone generator tone controller 42 reflects the initial parameter on the above-described adjustment frequency characteristic. That is, the parameters of the adjustment circuit are set based on the result of performing the correction using the initial parameters on the frequency characteristics for adjustment input by the operation. At this time, the tone controller for sound source 42 is permitted to set initial parameters for both the enhancement direction correction and the suppression direction correction.

  The microphone 16 collects the singing sound of the singer and generates and outputs a sound collecting signal. The generated sound pickup signal is converted into a digital format by the A / D converter 17 and input to the fixed microphone equalizing processing unit 18.

  The microphone fixed equalizing processing unit 18 includes a structure in which PEQs are cascade-connected, and a notch filter including an analog equalizer and a graphic equalizer connected in parallel. Specifically, the fixed equalization processing unit 18 for microphones is configured by cascading PEQs in about three to five stages. The fixed microphone equalizing processing unit 18 performs equalizing processing according to an initial parameter (default setting) set in advance by a method described later, and corrects the frequency characteristics of the collected sound signal. The correction by the microphone fixed equalizing processing unit 18 only performs correction for suppressing the peak. That is, the microphone fixed equalizing processing unit 18 performs only correction for reducing the level of the corresponding partial frequency component of the input signal. As a result, it is possible to perform in advance correction that hardly causes howling as a part of setting of the desired acoustic characteristic for a space in which the desired acoustic characteristic such as a karaoke box is desired to be set.

  The collected sound signal corrected by the fixed microphone equalizing processing unit 18 is subjected to predetermined echo processing by the echo processing unit 19 and input to the microphone tone controller 41.

  The microphone tone controller 41 has the same configuration as the tone generator tone controller 42 described above, but differs only in the setting and reflection of initial parameters. That is, the microphone tone controller 41 is allowed to set only the initial parameter for the suppression direction correction. Thereby, generation | occurrence | production of the howling regarding a sound collection signal can be suppressed. Further, since the microphone tone controller 41 has the same configuration as the tone generator tone controller 42 described above and the howling prevention processing is performed by the microphone fixed type equalizing processing unit 18 as described above, the microphone tone controller 41 is provided as necessary. It is also possible to allow the setting of the enhancement direction correction.

  The mixer 20 mixes the music sound signal input from the tone controller for sound source 42 and the sound collection signal input from the microphone tone controller 41 to generate a sound emission signal, and a fixed equalizing processing unit for sound emission. 12 is output.

  The fixed sound equalization processing unit 12 for sound emission has a structure in which PEQs having initial parameters set are cascade-connected in the same manner as the fixed microphone equalizing processing unit 18 for microphones. The fixed sound equalization processing unit 12 for sound emission is configured by cascading PEQs in about three to five stages, similarly to the fixed equalization processing unit 18 for microphones. The parameter setting method of the sound emission fixed equalizing processing unit 12 will be described later in the same manner as the initial parameters of the microphone fixed type equalizing processing unit 18. The fixed sound equalization processing unit 12 for sound emission performs correction to make the frequency characteristic of the sound emission signal close to the desired acoustic characteristic, and outputs it to the D / A converter 13. At this time, unlike the fixed microphone equalizing processing unit 18, the sound emission fixed equalizing processing unit 12 performs both correction for suppressing the peak and correction for enhancing the dip.

  The D / A converter 13 converts the sound emission signal (acoustic characteristic corrected sound emission signal) whose acoustic characteristics are corrected from a digital format to an analog format. The power amplifier 14 amplifies the acoustic characteristic corrected sound emission signal and applies the amplified sound characteristic signal to the speaker 15. The speaker 15 is driven based on the amplified acoustic characteristic correction sound emission signal and emits sound into the room. By using such a configuration, the music sound and the singing sound emitted from the speaker 15 are corrected to the desired acoustic characteristics and reach the singer holding the microphone 16. Thereby, the singer can sing in the karaoke box comfortably.

  Further, when the karaoke apparatus is inexpensive, the resources are limited, and therefore, there are often few resources for the sound emission fixed equalizing processing unit 12 and the microphone fixed equalizing processing unit 18. In such a case, by adjusting the initial parameters of the tone controller for sound source 42 and the tone controller for microphone 41 as described above, these are fixed to the sound emission fixed equalizing processing unit 12 and the microphone fixed type equalizing processing unit 18. Can be used as part of the resource.

  Next, an initial parameter setting method for the sound emission fixed equalizing processing unit 12, the microphone fixed equalizing processing unit 18, the tone generator tone controller 42, and the microphone tone controller 41 will be described.

  As shown in FIG. 2, in the setting system of initial parameters of the equalizing processing units 12 and 18 and the tone controllers 41 and 42 of the karaoke apparatus of the present embodiment, a test sound source 31 is provided together with each part of the karaoke apparatus shown in FIG. The characteristic measuring unit 40 is included. Upon receiving the test sound source generation start control, the test sound source 31 generates a preset signal or an acoustic characteristic measurement signal designated by the CPU 11, for example, a white noise signal or a pink noise signal. The D / A converter 13 converts the digital acoustic characteristic measurement signal into an analog signal and supplies it to the power amplifier 14. The power amplifier 14 amplifies the acoustic characteristic measurement signal with a predetermined amplification factor set in advance or designated by the CPU 11 and supplies the amplified signal to the speaker 15. The speaker 15 emits the acoustic characteristic measurement signal into a room where initial parameters are set. For example, when measuring the acoustic characteristics of a karaoke box, sound from an acoustic characteristic measurement signal is emitted from a speaker installed in the karaoke box.

  The microphone 16 is installed at a preset position in the same room as the speaker 15. For example, in a karaoke box, it is installed in a standing position where a singer usually stands. The microphone 16 picks up the sound of the acoustic characteristic measurement signal emitted from the speaker 15 and applies it to the A / D converter 17. The A / D converter 17 converts the acoustic characteristic measurement signal into a digital format. Output. The acoustic characteristic measurement signal converted into the digital format passes through the microphone fixed equalizing processing unit 18, the echo processing unit 19, and the microphone tone controller 41 which are not set and are not operating, and then the characteristic measurement unit 40. Is input.

  The characteristic measurement unit 40 detects the signal level of each partial frequency band obtained by dividing a predetermined measurement frequency range FB by a predetermined number, and outputs the signal level to the CPU 11. Specifically, each partial frequency band is obtained by dividing a measurement frequency range FB corresponding to a frequency band to be measured, which is set in advance from speaker characteristics, microphone characteristics, and the like, into equal frequency bands on the logarithmic axis. The characteristic measurement unit 40 includes band pass filters (BPFs) corresponding to the number of partial frequency bands and a signal level detection unit that detects a signal level of each partial frequency band. With such a configuration, the acoustic characteristic measurement signal input from the A / D converter 17 is decomposed into each band component by each BPF, and the level is detected by each signal level detection unit. The information is output to the CPU 11 together with the information. The characteristic measurement unit 40 includes a full-band signal level detection unit that detects a signal level in the measurement frequency range FB. The all-band signal level detection unit is connected in parallel with each series circuit, detects the signal level of the collected sound signal input from the A / D converter 17, and outputs it to the CPU 11 as the original signal level value.

The CPU 11 sets initial parameters of the equalizing processing units 12 and 18 and the tone controllers 41 and 42 in accordance with the processing flow of FIG.
FIG. 4 is a flowchart showing a flow of initial parameter setting processing of the karaoke apparatus.
The CPU 11 normalizes the level value of each partial frequency band component signal with the original signal level value, and detects the normalized signal level of each partial frequency band signal (S101).
The CPU 11 compares the level value of the normalized partial frequency band signal (normalized partial band signal level) with the normalized desired acoustic characteristic preset and stored in a memory (not shown) in each partial frequency band. Then, the difference value is calculated (S102).

  The CPU 11 detects a peak and a dip by referring to the sign of the difference value of each partial frequency band. For example, in each partial frequency band, the difference value is calculated by subtracting the signal level of the desired acoustic characteristic from the actually measured signal level to detect whether it is “+” or “−”. Then, the maximum and minimum are detected from the frequency characteristics (discrete function) of these difference value sequences, and the maximum is detected as a peak and the minimum is detected as a dip (S103). At this time, the CPU 11 temporarily stores each peak and dip in association with the signal level and the partial frequency band.

  The CPU 11 sorts the detected peaks and dips in descending order of the absolute value signal level (S104). The CPU 11 extracts the peaks and dips that can be corrected by the fixed sound equalization processing unit 12 for sound emission in the sort order, and calculates correction values for correcting the respective peaks and dips (S105). The CPU 11 extracts the peaks that can be corrected by the fixed microphone equalizing processing unit 18 from the remaining peaks that are not selected as correction targets in the processing of S105, and corrects the respective peaks. A correction value is calculated (S106).

  The CPU 11 extracts peaks and dips from the remaining signal levels that are not selected as correction targets in the processes of S105 and S106 in descending order of signal level (S107).

  The CPU 11 acquires the partial frequency band of the peak and dip extracted in S107, and detects whether or not the partial frequency band matches the adjustable frequency band of the tone controller for sound source 42 (S108). Here, if there exists a peak and a dip that match the adjustable frequency band of the tone controller for sound source 42 (S108: Y), the CPU 11 calculates a corresponding correction value (S109).

  When the correction processing for the tone generator tone controller 42 is completed, the CPU 11 detects whether or not it matches the adjustable frequency band of the microphone tone controller 41 for only the peak (S110). Here, if there is a peak that matches the adjustable frequency band of the microphone tone controller 41 (S110: Y), the CPU 11 calculates a corresponding correction value (S111). Note that the correction setting for the microphone tone controller 41 may be either peak or dip as described above.

  When the CPU 11 determines the correction values for the sound emission fixed equalizing processing unit 12, the microphone fixed equalizing processing unit 18, the tone generator tone controller 42, and the microphone tone controller 41 as described above, these correction values and corrections are corrected. Based on the object, a parameter list is generated for the adjusting elements such as PEQs constituting the equalizing processing units 12 and 18 and the tone controllers 41 and 42 (S112). Then, according to the parameter list, the CPU 11 transmits initial parameters to the adjustment elements of the sound emission fixed equalizing processing unit 12, the microphone fixed equalizing processing unit 18, the tone generator tone controller 42, and the microphone tone controller 41. (S113). The equalizing processing units 12 and 18 and the tone controllers 41 and 42 execute the above-described correction and adjustment processes according to the given initial parameters.

  With such a configuration, the tone generator tone controller 42 and the microphone tone controller 41 can be transmitted from the user even if the fixed sound equalization processing unit 12 for sound emission and the fixed equalization processing unit 18 for microphones have few resources. It can be used not only for adjustment by operation input but also for correction of acoustic environment. Thereby, it is possible to realize an acoustic environment closer to the desired acoustic characteristics by effectively utilizing resources.

  Next, a specific example of the process of correcting the acoustic environment will be described with reference to FIGS.

FIG. 5 shows a frequency for explaining a method of setting initial parameters (default values) of the sound emission fixed equalizing processing unit 12, the microphone fixed equalizing processing unit 18, the tone generator tone controller 42, and the microphone tone controller 41. FIG. In the description of this figure, as an example, a case where correction is performed by the tone controller for sound source 42 and correction is not performed by the tone controller for microphone 41 is shown. FIG. 5A shows the concept of peak and dip based on the frequency characteristic 250 of the collected sound signal and the desired acoustic characteristic 260 set in advance, and FIG. 5B shows the correction by the fixed sound equalization processing unit 12 for sound emission. The frequency characteristic 251 and the desired acoustic characteristic 260 of the collected sound signal in a state in which the estimation is performed (for example, simulation) are shown. FIG. 5C shows the frequency characteristic 252 and the desired acoustic characteristic 260 of the collected sound signal after correction processing by the fixed microphone equalizing processing unit 18, and FIG. 5D shows the correction by the tone controller for sound source 42. A frequency characteristic 253 and a desired acoustic characteristic 260 of the collected sound signal after processing are shown.
FIG. 6 is a diagram for explaining a change in adjustment characteristics in the tone controller for sound source 42. FIG. 6A is a diagram showing the characteristics shown in FIG. 5D again. FIG. 6B illustrates correction when the mid-range enhancement adjustment MID + is selected, and FIG. 6C illustrates correction when the mid-range suppression adjustment MID− is selected.

  As shown in FIG. 5A, the CPU 11 obtains a difference value between the measured frequency characteristic 250 of the collected sound signal and the desired acoustic characteristic 260 in each partial frequency band by the method as described above. 273, 274, 276 and dip 272, 275 are detected, and respective difference values are obtained. At this time, the CPU 11 stores the difference values of the peaks 271, 273, 274, 276 as “+” values, and stores the difference values of the dips 272, 275 as “−” values.

  Next, the CPU 11 compares the absolute values of the difference values, reads them in descending order of the absolute value of the difference values, and sets the number of adjustments according to the number of adjusting elements (such as the number of PEQ stages) of the sound emission fixed equalizing processing unit 12. Set the correction value for the peak or dip. In the example of FIG. 5, the number of peaks / dips that can be processed by the fixed sound equalization processing unit 12 for sound emission is three, and the CPU 11 has dip 272, dip 275, and peak with high absolute value levels. 276 is selected, and a correction parameter for correcting each difference value is set. By setting such a correction parameter and giving it to the fixed sound equalization processing unit 12 for sound emission, as shown in FIG. 5B, the dip 272 and the dip 275 are enhanced and the peak 276 is suppressed, As a first step, an acoustic characteristic 251 close to the desired acoustic characteristic can be realized.

  Next, the CPU 11 sets a correction value for the number of peaks according to the number of adjusting elements (the number of PEQ stages, etc.) of the fixed equalizing processing unit 18 for microphones. In the example of FIG. 5, the number of peaks that can be processed by the fixed microphone equalizing processing unit 18 is two, and the CPU 11 is used for the processing by the fixed sound equalizing processing unit 12 for sound emission. Next to the peak dip, peaks 271 and 273 having higher absolute value levels are selected, and correction parameters for correcting the respective difference values are set. By setting such correction parameters and providing them to the fixed microphone equalizing processing unit 18, the peaks 271 and 273 are suppressed and the acoustic characteristics closer to the desired acoustic characteristics 260 are obtained as shown in FIG. 252 can be realized. In the above description, the preset desired acoustic characteristic is used for the calculation of the correction value for the fixed microphone equalizing processing unit 18, but a flat characteristic may be used instead of the desired acoustic characteristic. Good. That is, the CPU 11 prepares a flat characteristic in which the signal level is constant over the entire measurement frequency range FB, and detects a peak with respect to the flat characteristic in the characteristic corrected by the sound emission fixed equalizing means 12. A correction value for correcting the peak may be given. Thereby, although the acoustic characteristic does not coincide with the desired characteristic, a peak that can be howling can be suppressed and howling can be reliably prevented.

  Next, the CPU 11 extracts a peak dip that has not been used for the correction of the sound emission fixed equalizing processing unit 12 and the microphone fixed type equalizing processing unit 18, and corresponds to an adjustable frequency band of the tone controller for sound source 42. Determine if there are peaks and dips to play. In the example of FIG. 5, the peak 274 is selected and a correction parameter for correcting the difference value is set, as can be seen by comparing FIGS. 6A, 6 </ b> B, and 6 </ b> C. When such a correction parameter is set and applied to the tone generator tone controller 42, when the tone generator tone controller 42 selects the mid-range enhancement adjustment characteristic MID + and the mid-range suppression adjustment characteristic MID-, FIG. ), The peak 274 is suppressed, and the acoustic characteristic 253 closer to the desired acoustic characteristic 260 can be realized.

  At this time, as shown in FIGS. 6B and 6C, the tone controller for sound source 42 is set with the corrected mid-range enhancement adjustment characteristic MID + ′ or mid-range suppression adjustment characteristic MID− ′. That is, when the mid-range enhancement adjustment characteristic MID + is selected, the mid-range enhancement characteristic MID + ′ whose overall level is lower than the original mid-range enhancement characteristic MID + by an amount corresponding to the difference value level of the peak 274 is used. Is done. On the other hand, when the mid-range suppression adjustment characteristic MID− is selected, the mid-range suppression characteristic MID− whose overall level is lower by an amount corresponding to the difference value level of the peak 274 than the original mid-range suppression characteristic MID−. 'Is used.

  In this example, the microphone tone controller 41 is not used, but the microphone tone controller 41 is also subjected to processing equivalent to that of the tone generator tone controller 42, without processing in the enhancement direction. be able to.

Next, a karaoke apparatus according to a second embodiment will be described with reference to the drawings.
FIG. 7 is a block diagram showing the configuration of the karaoke apparatus of the present embodiment.
FIG. 8 is a diagram for explaining a process of suppressing a peak generated during performance by the karaoke apparatus shown in FIG.
The karaoke apparatus of the present embodiment is different from the karaoke apparatus shown in FIG. 1 between a A / D converter 17 on the microphone 16 side and a fixed equalizing processing unit 18 for microphones, a howling detection unit 51, and an adaptation for microphones. The type equalizing processing unit 52 is inserted, and other configurations are not changed. Therefore, only the changed part will be described below, and the other description will be omitted.

  The collected sound signal output from the A / D converter 17 is input to a howling detection unit 51 and an adaptive equalizing processing unit 52 for microphones.

  The howling detection unit 51 divides the acquired sound pickup signal by a predetermined number of band divisions, and detects the signal level of each partial frequency band. When a partial frequency band having a signal level higher than a preset howling detection threshold is detected, the partial frequency band information and the detection signal level are output to the adaptive equalizing processing unit 52 for microphones.

  The microphone adaptive equalizing processing unit 52 has the same configuration as the above-described microphone fixed equalizing processing unit 18 and includes a notch filter having a structure in which PEQs having a larger number of stages are cascade-connected. As a specific example, the adaptive equalizing processing unit 52 for microphones is configured by cascading PEQs in about 7 to 10 stages. The adaptive equalizing processing unit for microphone 52 sets the parameters of the notch filter according to the situation at that time according to the partial frequency band information and the detection signal level input from the howling detection unit 51. The microphone adaptive equalizing processing unit 52 performs filter processing according to the set parameters, and corrects the frequency characteristics of the collected sound signal input from the microphone 16. At this time, the microphone adaptive equalizing processing unit 52 performs only correction for suppressing the peak. That is, the microphone adaptive equalizing processing unit 52 performs only correction for reducing the level of the corresponding partial frequency component of the input signal. As a result, when a situation in which howling is likely to occur due to the movement of the singer or the like, the level of the partial frequency component that can be the howling is reduced to suppress howling.

  The collected sound signal subjected to the adaptive equalizing process is input to the fixed microphone equalizing processing unit 18.

  When karaoke is started with the initial parameters set in this manner, the acoustic environment changes due to the individuality (frequency characteristics, sound level, etc.) of the singer's singing voice and the movement of the singer. In this case, on the principle as shown in FIG. 8, the adaptive adaptive equalizing processing unit 18 for microphone executes the correction process as described above.

FIG. 8 is a frequency characteristic diagram for explaining the correction method of the adaptive equalizing processing unit 52 for microphones.
As described above, when karaoke is started in a state where the acoustic characteristics at the time of default are corrected and the acoustic environment changes, the acoustic characteristics change according to the environmental change. That is, new peaks and dips that were not present during the default correction are generated. For example, in the case of FIG. 8A, a new peak 281 is generated. The howling detection unit 51 detects such a change in the frequency characteristic of the acoustic environment, detects the signal level of the newly generated peak 281, and adaptively equalizes the signal level of the peak 281 and the partial frequency band for the microphone. To the unit 52. The adaptive equalizing processing unit 52 for microphones uses a filter coefficient as a notch filter so that the signal level of the partial frequency band is lower than the predetermined threshold level than the howling threshold level THhw according to the acquired partial frequency band and signal level. Set. The microphone adaptive equalizing processing unit 52 performs filtering processing based on the notch frequency. Thereby, as shown in FIG. 8B, a frequency characteristic 255 in which the signal level of the peak 281 is suppressed is obtained, and howling can be prevented.

  By using such a configuration, it is possible to prevent howling that cannot be predicted at the time of default setting. Thereby, it is possible to realize an acoustic environment that does not give unpleasant feeling to the singer or listener at any point in time from the start of karaoke to the continuation. At this time, since the number of bands (corresponding to the number of PEQs) of the adaptive equalizing processing unit 52 for microphones is set to about twice that of the two fixed equalizing processing units, a change in acoustic environment with high randomness is achieved. It is possible to reliably suppress the occurrence of howling. In particular, by using the adaptive equalizing processing unit 19 for microphones only for suppressing the signal level, it is possible to secure a large number of resources for preventing howling, and even when the resources of the device are limited, Further, howling can be prevented reliably and accurately.

  In the above description, an example of performing peak and dip detection in the entire band has been shown, but the signal level on the high frequency side and low frequency side is lowered due to the sound emission characteristics of the speakers and the sound collection characteristics of the microphone. The above-described processing is preferably performed in a region where the signal level is constant.

  In the above description, the sound collection characteristic of the microphone 16 is not particularly specified. However, by acquiring the sound collection characteristic of the microphone 16 in advance and giving it to the CPU 11, the CPU 11 can Correction parameters that also take into account the sound collection characteristics can be set in the fixed sound equalization processing unit 12 for sound emission, the adaptive equalizing processing unit 18 for microphone, the tone controller 42 for sound source, and the tone controller 41 for microphone. Thereby, the acoustic characteristic by the system | strain from the speaker 15 to the singer who sings with the microphone 16 can be set to a desired characteristic, and the more suitable acoustic environment for a singer can be implement | achieved.

It is a block diagram which shows the structure of the karaoke apparatus of the 1st Embodiment of this invention. 1 shows a system configuration for setting initial parameters (default values) of the fixed sound equalization processing unit 12, the fixed microphone equalizing processing unit 18, the tone controller for sound source 42, and the tone controller for microphone 41 shown in FIG. FIG. It is a figure which shows the frequency characteristic adjusted with the tone controller 42 for sound sources, and the tone controller 41 for microphones. It is the flowchart which showed the flow of the initial parameter setting process of a karaoke apparatus. FIG. 6 is a frequency characteristic diagram for explaining a method of setting initial parameters (default values) of sound emission fixed equalizing processing unit 12, microphone fixed equalizing processing unit 18, tone generator tone controller 42, and microphone tone controller 41. . It is a figure explaining the change of the adjustment characteristic in the tone controller 42 for sound sources. It is a block diagram which shows the structure of the karaoke apparatus of the 2nd Embodiment of this invention. It is a figure explaining the process in which the peak which generate | occur | produces during the performance by the karaoke apparatus shown in FIG. 7 is suppressed.

Explanation of symbols

11-CPU, 12-sound fixed fixed equalizing processing unit, 13-D / A converter, 14-power amplifier, 15-speaker, 16-microphone, 17-A / D converter, 18-fixed equalizing process for microphone Unit, 19-echo processing unit, 20-mixer, 30-sound source, 31-test sound source, 40-characteristic measuring unit, 41-tone controller, 42-tone controller, 51-howling detection unit, 52-microphone Adaptive equalizing processing unit

Claims (4)

A microphone that picks up the singing voice of the singer and generates a pickup signal;
A music sound source that reproduces music data and generates a music sound signal;
Mixing means for generating a sound emission signal by mixing the sound collection signal and the music sound signal;
A karaoke apparatus comprising: a speaker that emits sound into a predetermined space based on a sound emission signal;
A first fixed equalizing means that is inserted between the mixing means and the speaker and performs peak suppression or dip enhancement on a desired acoustic characteristic of a system acoustic characteristic from the speaker to the microphone measured in advance;
Second fixed equalizing means that is inserted between the microphone and the mixing means and is not corrected by the first fixed equalizing means, and only performs peak suppression of the frequency characteristic of the collected sound signal;
A tone controller for a sound source that is connected between the music sound source and the mixing means, and is operable to adjust a frequency characteristic of the music sound signal with a specific correction characteristic for the sound source;
With
If the frequency band of the peak or dip that is not corrected by the first fixed equalizing means and the second fixed equalizing means matches the frequency band of the sound source specific correction characteristic, it corresponds to the frequency band of the sound source specific correction characteristic. Set the correction amount to the peak and dip as the initial value of the specific correction characteristic for the sound source,
Karaoke equipment. An operable microphone tone controller that is connected between the second fixed equalizing means and the mixing means and adjusts the frequency characteristic of the collected sound signal with a specific correction characteristic for microphone;
If the peak frequency band that is not corrected by the first fixed equalizing means and the second fixed equalizing means matches the frequency band of the microphone specific correction characteristic, the peak corresponding to the frequency band of the microphone specific correction characteristic The karaoke apparatus according to claim 1, wherein a correction amount is set as an initial value of the specific correction characteristic for microphone.   And an adaptive equalizing unit that is inserted between the microphone and the mixing unit and that is not corrected by the first fixed equalizing unit and suppresses a difference value peak caused by an environmental change caused by an acoustic characteristic. The karaoke apparatus according to claim 1.   Adaptive equalizing means that is inserted between the microphone and the mixing means and suppresses a peak caused by an environmental change caused by an acoustic characteristic that is not corrected by the first fixed equalizing means and the second fixed equalizing means. The karaoke apparatus according to claim 2, wherein the karaoke apparatus is provided.

Images