JP2018173570A - Karaoke apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a karaoke apparatus capable of changing a key in a state in which it is difficult for an audience to recognize the change.SOLUTION: A karaoke apparatus includes: an acceptance unit for accepting key-changing information and position information; a performance duration-measuring unit for measuring a performance time period from a change-starting position to a change-terminating position; a change time-calculating unit for calculating a change time per predetermined cent value, by dividing the measured performance time period by a cent value based on the key-changing information; a key change processing unit for generating performance data where a key is changed in increments of a predetermined cent value, for every change time, from a predetermined key; and a performance processing unit for conducting a karaoke performance on the basis of the performance data where the key is changed.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a karaoke apparatus.

  The karaoke apparatus performs a karaoke performance of the music selected by the singer. A key is set in advance for each piece of karaoke performance.

  On the other hand, the karaoke apparatus is provided with a key control function for changing a preset key. By using the key control function, the singer can change the key of the music to a key that is easy for him to sing. The key control function can be used before karaoke singing or even during karaoke singing.

  Such a key control function is performed, for example, by selecting a button provided on the front panel of the karaoke device or an icon to be displayed on the display screen of the remote control device. The conventional karaoke apparatus can change a preset key for each semitone (100 cents) according to selection of a button or an icon.

  Here, as a specific process in the conventional key control function, Patent Document 1 describes an automatic performance device that rewrites the pitch of the read MIDI data into a key of a key to be transposed and inputs it to the sound source. There is. When the MIDI data with the rewritten pitch is input to the sound source, the tone generated thereafter is transposed to a predetermined key (key).

JP 2007-178890 A

  By the way, there are many singers who do not grasp the key preset for the music to be selected. In this case, the singer will notice that the key of the music is hard to sing after the karaoke performance of the selected music is started.

  At this time, if the conventional key control function is used, the key is changed in units of semitones, so that the audience can easily recognize that the key has been changed. Therefore, many singers feel annoyed at changing keys after karaoke performance is started.

  An object of the present invention is to provide a karaoke apparatus capable of changing a key so that an audience cannot easily recognize it.

A main invention for achieving the above object is a karaoke apparatus for performing a karaoke performance of a song selected by a singer, which includes a cent value for changing a key preset in the song to a predetermined key. A receiving unit for receiving key change information and position information including a change completion position for completing the change to the predetermined key in the performance section of the music; and the change completion position from the change start position in the performance section of the music A performance time calculation unit that calculates a performance time until a change time calculation unit that calculates a change time per predetermined cent value by dividing the calculated performance time by a cent value based on the key change information; A key change processing unit for generating performance data in which the key is changed by the predetermined cent value from the preset key at each change time; and the key There is a karaoke apparatus having a performance processing section which performs karaoke performance on the basis of the changed performance data.
Other characteristics of the present invention will be made clear by the description and drawings described later.

  According to the present invention, the key can be changed so that the audience cannot easily recognize the key.

It is a figure which shows the hardware structural example of the karaoke apparatus which concerns on embodiment. It is a figure which shows the hardware structural example of the remote control apparatus which concerns on embodiment. It is a figure which shows the display screen of the remote control apparatus which concerns on embodiment. It is a figure which shows the display screen of the remote control apparatus which concerns on embodiment. It is a figure which shows the software structural example of the karaoke main body which concerns on embodiment. It is a flowchart which shows the process of the karaoke apparatus which concerns on embodiment.

  In addition to the main invention described above, at least the following matters will become apparent from the description of the specification and drawings described below.

  In other words, the karaoke apparatus having the predetermined cent value of 1 cent becomes clear. By setting the predetermined cent value to 1 cent, the karaoke apparatus can change the key so that it is difficult for the audience to recognize.

  In addition, when the performance time is shorter than a predetermined value, the change time calculation unit changes the cent value obtained by dividing the performance time to a value smaller than the cent value of the key change information, and the changed cent value The karaoke device that calculates the change time per the predetermined cent value becomes clear by dividing the performance time. According to such a karaoke apparatus, the key can be changed so that the singer can easily sing.

  Furthermore, the karaoke apparatus which has a presentation part which shows that the said key was changed by the said key change process part with respect to a singer becomes clear. According to such a karaoke apparatus, it becomes easy for a singer to grasp that a key change is performed.

<Embodiment>
With reference to FIGS. 1-5, the karaoke apparatus 1 which concerns on embodiment is demonstrated.

== Karaoke equipment ==
The karaoke apparatus 1 is an apparatus for performing karaoke performance of a song selected by a singer and singing a karaoke by a singer. As shown in FIG. 1, the karaoke apparatus 1 includes a karaoke main body 10, a speaker 20, a display device 30, a microphone 40, and a remote control device 50.

  The speaker 20 is configured to emit sound based on the sound emission signal from the karaoke main body 10. The display device 30 is configured to display a video or an image on the screen based on a signal from the karaoke main body 10. The microphone 40 is configured to convert a singer's singing voice (input voice from the microphone 40) into an analog voice signal and input it to the karaoke main body 10.

  The karaoke main body 10 performs various controls related to karaoke singing, such as karaoke performance control of the selected music, display control of lyrics and background images, and processing of audio signals input through the microphone 40. As shown in FIG. 1, the karaoke main body 10 includes a control unit 11, a communication unit 12, a storage unit 13, an acoustic processing unit 14, a display processing unit 15, and an operation unit 16. Each component is connected to the bus B via an interface (not shown).

  The control unit 11 includes a CPU 11a and a memory 11b. The CPU 11a implements various control functions by executing the operation program stored in the memory 11b. The memory 11b is a storage device that stores a program to be executed by the CPU 11a and temporarily stores various types of information when the program is executed.

  The communication unit 12 provides an interface for connecting the karaoke main unit 10 to a communication line via a router (not shown).

  The storage unit 13 is a large-capacity storage device that stores various data, and is, for example, a hard disk drive. The storage unit 13 stores a plurality of pieces of music data for performing karaoke performance by the karaoke apparatus 1.

  The music data is given a music ID for specifying individual music. The music data includes performance data, reference data, performance section data, time data, and the like. The performance data is MIDI format data that is the source of the karaoke performance sound. Reference data is data used as a reference when scoring a karaoke song by a singer. The performance section data is the performance section included in each musical piece (for example, No. 1 A melody, No. 1 B melody, No. 1 rust, Interlude, No. 2 A melody, No. 2 B melody, No. 2 rust) 3 A melody, 3 B melody, 3 rust). The performance section data includes performance mark data indicating the start position of each performance section. Each performance section can be identified by referring to the performance mark data. The time data is data indicating the elapsed time to the performance position where the music is set when the music performance start time is set to zero. The time data is set for each performance section or each note included in the music. For example, the time data of a certain note indicates the elapsed time from the start of music performance to the certain note. Or the time data of a certain performance section show the elapsed time from the performance start of a music to the performance start position (or end position) of the certain performance section.

  The storage unit 13 also displays lyrics telop data for displaying the lyrics telop corresponding to each piece of music on the display device 30, background image data such as a background image displayed on the display device 30 during karaoke performance, and the song Attribute information (information related to the music such as the singer name, lyrics / composer name, and genre) is stored.

  Based on the control of the control unit 11, the sound processing unit 14 controls karaoke performance for music and processes a singing voice signal input through the microphone 40. The acoustic processing unit 14 includes, for example, a MIDI sound source, a mixer, and an amplifier (all not shown). The control unit 11 sequentially reads the performance data of the reserved music based on the tempo clock signal and inputs it to the MIDI sound source. The MIDI sound source generates a musical sound signal based on the performance data. The mixer mixes the music signal and the audio signal output from the microphone 40 at an appropriate ratio and outputs the mixed signal to the amplifier. The amplifier amplifies the mixing signal from the mixer and outputs the amplified signal to the speaker 20 as a sound emission signal. Thereby, the karaoke performance sound based on the sound emission signal and the singing voice from the microphone 40 are emitted from the speaker 20.

  The display processing unit 15 performs processing related to various displays on the display device 30 based on the control of the control unit 11. For example, the display processing unit 15 controls the display device 30 to display a video in which lyrics telop and various icons are superimposed on a background video during karaoke performance.

  The operation unit 16 includes a panel switch and a remote control receiving circuit. The operation unit 16 sends operation signals such as a music selection signal and a performance stop signal to the control unit 11 according to the operation of the panel switch of the karaoke device 1 or the remote control device 50 by the singer. Output. The control unit 11 detects an operation signal from the operation unit 16 and executes a corresponding process.

  The remote control device 50 is a device for performing various operations on the karaoke main body 10. The singer can use the remote controller 50 to select (reserve) a song for which karaoke singing is desired.

  FIG. 2 is a diagram illustrating a hardware configuration of the remote control device 50. The remote control device 50 includes a storage unit 50a, a communication unit 50b, a display unit 50c, an operation unit 50d, and a control unit 50e.

  The storage unit 50a is a large-capacity storage device that stores various types of data. The communication unit 50 b provides an interface for connecting the remote control device 50 and the karaoke main body 10. The display unit 50c displays a reservation screen for reserving music. The operation unit 50d is configured to make various inputs to the remote control device 50. The operation unit 50d may be a button or the like provided on the hardware of the remote control device 50, or may be an icon displayed on the display unit 50c. The control unit 50e performs various controls in the remote control device 50. The control unit 50e includes a CPU and a memory (both not shown). The CPU realizes various functions by executing programs stored in the memory. In addition, the control part 11 of the karaoke main body 10 may also serve as the function of the control part 50e.

  Here, an example in which an input for changing the music key is performed via the remote controller 50 will be described.

  In remote control device 50, for example, key change input similar to the conventional one can be input from a key change operation screen as shown in FIG. 3A. The “+” icon shown in FIG. 3A corresponds to an icon for instructing to raise the key by a semitone, and the “−” icon corresponds to an icon for instructing to lower the key by a semitone. For example, when the “+” icon is selected once by the singer, the control unit 50e displays “+1” on the screen (see FIG. 3A). In addition, the control unit 50e instructs the karaoke main body 10 to raise the key by a semitone (100 cents).

  On the other hand, in the karaoke apparatus 1 in the present embodiment, in addition to the conventional key change, it is possible to input a key change different from that. When performing a key change different from the conventional one, the singer selects a dedicated icon ("slow key change" icon displayed in FIG. 3A). In this case, the control unit 50e displays a dedicated screen shown in FIG. 3B.

  On the dedicated screen shown in FIG. 3B, key change information and position information can be selected.

  The key change information is information including a cent value for changing a key set in advance to a music piece to a predetermined key. The key change information indicates how much the key is to be changed from a preset key.

  For example, as illustrated in FIG. 3B, the control unit 50e displays numerical icons “−6” to “+6” as changeable keys. “+” Corresponds to raising the key, and “−” corresponds to lowering the key by a semitone. The numbers “1-6” correspond to semitones (100 cents). For example, “+2” corresponds to raising a preset key by one note (200 cents). The singer selects an arbitrary icon from these numerical icons. Based on the selected numerical icon, the controller 50e determines whether to raise or lower the key and how much to change the key. That is, the key change information is information including information on whether the key is raised or lowered and the cent value to be changed. The key (for example, “+2”) indicated by the selected icon in the above example corresponds to a “predetermined key”.

  The position information includes a change completion position at which the change to the predetermined key is completed during the musical performance section.

  For example, as illustrated in FIG. 3B, the control unit 50 e displays a performance section included in a song currently being karaoke played as a position icon. The singer selects an arbitrary position icon (arbitrary position) from these position icons. The control unit 50e determines the start position or the end position of the performance section corresponding to the selected position icon as the change completion position. In addition, the control part 50e can also be displayed so that a singer cannot select about the performance area where the karaoke performance has already ended. In the example of FIG. 3B, performance sections that cannot be selected are indicated by diagonal lines.

  Here, in order to display the dedicated screen as shown in FIG. 3B, the remote control device 50 needs performance section data and time data of the music being played karaoke. Therefore, the karaoke main body 10 transmits the performance section data and time data of the music to the remote control device 50 before starting the karaoke performance of the music.

  When the “slow key change” icon shown in FIG. 3A is selected by the singer, the control unit 50e displays position information based on the performance section data. When the “slow key change” icon shown in FIG. 3A is selected by the singer, the control unit 50e transmits a signal to that effect to the karaoke main body 10. The karaoke main body 10 transmits the elapsed time from the start of karaoke performance to the control unit 50e. The control part 50e can grasp | ascertain the performance area in which the present karaoke performance is performed by comparing the said elapsed time and the time data for every performance area. The control unit 50e displays the position icon of the performance section before the grasped performance section so that it cannot be selected.

  The singer selects the “decision” icon after completing the selection of the numerical icon and the position icon. The remote control device 50 uses “change key cent value” and “change cent value” indicated by the selected numerical icon as key change information, and “change completion position” indicated by the selected position icon as position information. , Respectively, to the karaoke main body 10.

  Of the selections described above, the selection corresponding to the key change information may be performed via the operation unit 16 of the karaoke main body 10.

  Moreover, the remote control device 50 may realize a similar function with a portable terminal owned by a singer. For example, by executing dedicated application software downloaded in advance on a mobile terminal, the mobile terminal can be used as a remote control device.

  The key change input operation on the remote controller 50 may be known to the audience. On the other hand, if it is a portable terminal owned by an individual, there is no sense of incongruity even if it is operated during singing, and it is difficult for the audience to grasp that the key change input operation has been performed. Therefore, it becomes more difficult to notice that the key change has been selected.

(Software configuration)
FIG. 4 is a diagram illustrating a software configuration example of the karaoke main body 10. The karaoke main body 10 includes a reception unit 100, a performance time calculation unit 200, a change time calculation unit 300, a key change processing unit 400, a performance processing unit 500, and a presentation unit 600. The reception unit 100, the performance time calculation unit 200, the change time calculation unit 300, the key change processing unit 400, the performance processing unit 500, and the presentation unit 600 are realized by the CPU 11a executing a program stored in the memory 11b. .

[Reception Department]
The receiving unit 100 receives key change information and position information.

  The accepting unit 100 accepts key change information and position information transmitted from the remote control device 50 via the communication unit 12. The reception unit 100 outputs the received key change information to the change time calculation unit 300 and outputs the received position information to the performance time calculation unit 200. In the following example, description will be made assuming that the received key change information is “down key 200 cents (predetermined key: 1 note down)” and the position information is “end position of the second B melody”.

[Performance time calculator]
The performance time calculation unit 200 calculates the performance time from the change start position to the change completion position in the music performance section.

  The change start position is a position in the performance section after the time when the receiving unit 100 receives the position information (or when the performance time calculating unit 200 receives the position information). The change start position may be specified in units of notes, or the end position of the performance section including the currently karaoke-played note or the next performance section of the performance section including the currently karaoke-played note. The start position may be specified.

  The performance time calculation unit 200 specifies the time at the change start position and the time at the change completion position indicated by the position information based on the time data, and calculates the performance time by obtaining the difference.

  For example, it is assumed that the position information is received at the time when the first B melody is played with karaoke. In this case, the performance time calculation unit 200 determines that the time at the first chorus start position (corresponding to the change start position), which is the performance section next to the first B melody, is 72 seconds from the start of the performance based on the time data. Identify later. Also, the performance time calculation unit 200 specifies, based on the time data, that the time at the second B melody end position corresponding to the change completion position is 168 seconds after the performance start. In this case, the performance time calculation unit 200 calculates 96 seconds, which is the difference (168 seconds-72 seconds), as the performance time.

  The performance time calculation unit 200 outputs the calculated performance time to the change time calculation unit 300.

[Change time calculation section]
The change time calculation unit 300 calculates the change time per predetermined cent value by dividing the calculated performance time by the cent value based on the key change information.

  The cent value based on the key change information is determined by the cent value included in the key change information. For example, when it is desired to change the key slowly, the cent value is preferably set to the cent value indicated by a predetermined key selected by the singer.

  The predetermined cent value is a value for determining a cent value to be changed every change time. As described above, when the cent value obtained by dividing the calculated performance time is “200”, the predetermined cent value is “1”. That is, the change time calculation unit 300 calculates the change time per cent.

  For example, in the above example, when “96 seconds” is input as the performance time from the performance time calculation unit 200, the change time calculation unit 300 divides this performance time by a cent value (200 cents) based on the key change information. As a result, “0.48 seconds” is calculated as the change time per cent.

  The change time calculation unit 300 outputs the calculated change time to the key change processing unit 400.

[Key change processing section]
The key change processing unit 400 generates performance data in which a key is changed by a predetermined cent value from a preset key at every change time.

  For example, a case where the calculated change time is “0.48 seconds” and the predetermined cent value is “1” will be described as an example. The key change processing unit 400 generates performance data s′1 in which the key is lowered by one cent with respect to the performance data s1 of the music piece A (the key is set in advance) read based on the tempo clock signal. The key change processing unit 400 outputs the generated performance data s′1 to the performance processing unit 500.

  Further, 0.48 seconds after the performance data s′1 is generated, the key change processing unit 400 performs the key of the performance data s′1 (preliminarily set) with respect to the performance data s2 of the music A read based on the tempo clock signal. The performance data s′2 is generated by lowering the key by one cent than that obtained by lowering the key by one cent. The key change processing unit 400 outputs the generated performance data s′2 to the performance processing unit 500. The key change processing unit 400 repeats this process until a predetermined key (one note down) is reached. The time when the predetermined key is reached is the time when the karaoke performance is performed up to the change completion position.

[Performance processing section]
The performance processing unit 500 performs a karaoke performance based on the performance data.

  For example, when the performance processing unit 500 receives an input of a music ID of a reserved music, the performance processing unit 500 reads out music data corresponding to the music ID from the storage unit 13 and performs a karaoke performance of the reserved music.

  Here, the performance processing unit 500 according to the present embodiment performs a karaoke performance based on the performance data whose keys are changed.

  As described above, when receiving performance data with the key lowered by one cent every 0.48 seconds from the key change processing unit 400, the performance processing unit 500 sequentially transmits the performance data to the acoustic processing unit 14 ( MIDI input). In this case, the sound processing unit 14 emits a performance sound with the key lowered by one cent.

[Presentation section]
The presentation unit 600 presents to the singer that the key has been changed by the key change processing unit 400.

  For example, every time the performance data with the key changed is output to the performance processing unit 500, the key change processing unit 400 outputs a signal to that effect to the presentation unit 600. When receiving the input of the signal, the presentation unit 600 presents the key change in a manner that the singer can grasp.

  There are various modes of presentation. For example, when the presentation unit 600 receives a signal from the key change processing unit 400, the presentation unit 600 blinks the LED illumination of a volume knob (an example of the operation unit 16) provided in the karaoke main body 10. Alternatively, when a mobile terminal is used instead of the remote control device 50, when the presentation unit 600 receives a signal from the key change processing unit 400, the presentation unit 600 drives the vibration function of the mobile terminal.

== About the operation of the karaoke apparatus 1 ==
Next, a specific example of the operation of the karaoke apparatus 1 in the present embodiment will be described with reference to FIG. FIG. 5 is a flowchart showing an operation example of the karaoke apparatus 1. In this example, it is assumed that the singer wants to change the key so that the audience is not noticed during the karaoke performance.

  The remote control device 50 transmits the key change information and the position information selected by the singer to the karaoke main body 10. The accepting unit 100 accepts key change information and position information (accepts key change information, etc., Step 10). The accepting unit 100 outputs the key change information accepted in Step 10 to the change time calculating unit 300, and receives the position information. This is output to the performance time calculation unit 200.

  The performance time calculation unit 200 calculates the performance time from the change start position in the performance section of the music to the change completion position based on the position information received in step 10 (performance time calculation, step 11). The performance time calculation unit 200 outputs the calculated performance time to the change time calculation unit 300.

  The change time calculation unit 300 calculates the change time per cent by dividing the performance time calculated in step 11 by the cent value based on the key change information received in step 10 (calculation of change time. Step). 12). The change time calculation unit 300 outputs the calculated change time per cent to the key change processing unit 400.

  The key change processing unit 400 generates performance data in which the key is changed by one cent from a preset key at every change time calculated in step 12 (generates performance data in which the key is changed by one cent. Step 13). The key change processing unit 400 outputs the generated performance data to the performance processing unit 500.

  The performance processing unit 500 performs a karaoke performance based on the performance data in which the key generated in step 13 is changed (karaoke performance while changing the key by one cent. Step 14).

  Steps 13 and 14 are repeatedly performed until the key is changed to a predetermined key (when step 15 is Y).

  As described above, the karaoke apparatus 1 according to this embodiment includes the receiving unit 100 that receives the key change information and the position information input by the remote controller 50, and the performance time that calculates the performance time from the change start position to the change completion position. A calculation unit 200, a change time calculation unit 300 that calculates a change time per predetermined cent value by dividing the calculated performance time by a cent value based on the key change information, and a preset value for each change time. A key change processing unit 400 that generates performance data in which the key is changed by a predetermined cent value from the current key, and a performance processing unit 500 that performs karaoke performance based on the performance data in which the key has been changed.

  According to such a karaoke apparatus 1, a semitone key is not switched at a time in response to an input of a key change as in a conventional key change process, but the key is gradually changed by a predetermined cent value. Can do. Therefore, it is difficult for the audience to notice that the key has been changed. Moreover, since it can change to a predetermined | prescribed key by the position (change completion position. For example, before rust) which a singer desires, a singer can enjoy a karaoke song.

  Further, by setting the cent value to be changed to 1 cent, the audience becomes more difficult to notice that the key has been changed.

  On the other hand, when the key is changed gradually as in the karaoke apparatus 1 according to the present embodiment, it may be difficult to recognize whether or not the singer who has instructed the key change has changed the key. Therefore, the presentation unit 600 can present to the singer that the key has been changed. Therefore, the singer can easily grasp that the key change is actually performed.

<Others>
When the change completion position selected by the singer is close to the change start position, the performance time calculated by the performance time calculation unit 200 is shortened. In such a case, if the key is changed by one cent as in the above embodiment, the change time becomes extremely short. Therefore, since the singer is required to change the key in a short time, there is a possibility that it is difficult to sing karaoke.

  Therefore, when the performance time is shorter than the predetermined value, the change time calculation unit 300 changes the cent value for dividing the performance time to a value smaller than the cent value of the key change information, and uses the changed cent value for the performance time. By subtracting, the change time per predetermined cent value can be calculated.

  The predetermined value is set as an arbitrary time. The predetermined value may be set for each music piece, or a common value may be set. For example, the performance time from the start to the end of the shortest performance section among performance sections in a certain musical piece can be set as a predetermined value.

  How small the cent value of the key change information is can be arbitrarily determined depending on how much the key is to be changed in one change time. Alternatively, a predetermined ratio (for example, 1/10) may be determined in advance. The greater the cent value changed at one change time, the more likely the audience will notice that the key change has been made, while the singer is more likely to sing. The cent value changed in this way also corresponds to “cent value based on key change information”.

  For example, assume that the performance time is “30 seconds” and the cent value based on the key change information is “100 cents”. Further, it is assumed that “60 seconds” is set as the predetermined value.

  First, the change time calculation unit 300 checks whether the performance time is shorter than a predetermined value. When the performance time is shorter than a predetermined value, the change time calculation unit 300 sets the cent value obtained by dividing the performance time (30 seconds) to a value smaller than the cent value (100 cents) based on the key change information (for example, 10 cents). ). Then, the change time calculation unit 300 calculates the change time (3 seconds) per predetermined cent value (10 cents) by dividing the performance time (30 seconds) by the changed cent value (10 cents). Can do.

  According to such a karaoke apparatus 1, since the cent value changed in one change time can be increased, the singer can easily perform karaoke singing.

  The above embodiment is presented as an example and does not limit the scope of the invention. The above configurations can be implemented in appropriate combination, and various omissions, replacements, and changes can be made without departing from the scope of the invention. The above-described embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof in the same manner as included in the scope and spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Karaoke apparatus 10 Karaoke main body 50 Remote control apparatus 11 Control part 100 Reception part 200 Performance time calculation part 300 Change time calculation part 400 Key change process part 500 Performance process part 600 Presentation part

Claims (4)

A karaoke device that performs karaoke performance of a song selected by a singer,
Key change information including a cent value for changing a key set in advance to the music piece to a predetermined key, and a position including a change completion position for completing the change to the predetermined key in the performance section of the music piece A reception unit for receiving information;
A performance time calculation unit for calculating a performance time from the change start position to the change completion position in the performance section of the music;
A change time calculation unit that calculates a change time per predetermined cent value by dividing the calculated performance time by a cent value based on the key change information;
A key change processing unit for generating performance data in which the key is changed by the predetermined cent value from the preset key for each change time;
A performance processing unit for performing karaoke performance based on the performance data in which the key is changed;
Karaoke apparatus having   2. The karaoke apparatus according to claim 1, wherein the predetermined cent value is 1 cent.   When the performance time is shorter than a predetermined value, the change time calculation unit changes a cent value obtained by dividing the performance time to a value smaller than the cent value of the key change information, and the changed cent value is used as the cent value. 3. The karaoke apparatus according to claim 1, wherein a change time per said predetermined cent value is calculated by dividing a performance time.   The karaoke apparatus according to any one of claims 1 to 3, further comprising a presentation unit that presents to the singer that the key has been changed by the key change processing unit.

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