KR0154991B1 - Singing state display device and method of electronic song half cycle - Google Patents

Abstract

In the electronic singing class cycle, when the user's singing status is evaluated and the score is displayed, the score is not only displayed after the song is finished, but only the volume difference or the degree of the beat is measured. In addition, the accuracy of the beat is not known, and the volume state representing the magnitude of the volume or the beat state representing the slow and fast beat are improved. To this end, a level corresponding to the volume of the singing voice signal generated according to the user's song and a preset reference voice signal is detected, and the level difference between the singing voice signal with respect to the reference voice signal is detected by comparing the levels of the two detected signals. In addition, a phase corresponding to the beat of the singing voice signal and the reference voice signal is detected, and the phase difference of the singing voice signal with respect to the reference voice signal is detected by comparing the phases of the two detected signals. Then, by comparing the detected level difference and the phase difference value with a plurality of reference values set to different sizes in advance, the volume state and the beat state according to the user's song are determined, and then the determined volume state and the beat state are displayed. do. Therefore, even while the user is singing, the volume state or the beat state is evaluated and displayed at every moment so that the user can adjust the volume or the beat every time.

Description

Singing state display device and method of electronic song half cycle

1 is a block diagram of a song state display device according to the present invention.

2 is an operational waveform diagram of the volume state detector of FIG.

3 is an operational waveform diagram of the time signature detector of FIG.

4A and 4B show screen display examples of the song state of the present invention.

5 is a processing flowchart of the song state display according to the present invention.

* Explanation of symbols for main parts of the drawings

12, 14: 1st, 2nd BPF 16, 18: 1st, 2nd level detector

20, 22, 36, 38: 1st, 2nd, 3rd, 4th A / D converter 24: Subtractor

26, 28: first and second zero crossing detection circuit 30: phase comparator

32, 34: 1st, 2nd LPF 40: microcomputer

42: OSD controller 44: Mixing unit

46: image display unit 48: volume state detection unit

50: beat state detection unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic song half cycle, and more particularly, to a song state display apparatus and method for detecting and displaying a song state of a user.

In general, an electronic song half cycle refers to a device that allows a user to sing along by playing back an accompaniment recorded on a recording medium to a user. The electronic song half cycle is typically used in conjunction with an imaging system that displays a video that changes with the progress of the song in order to provide a better sense of presence to the user. In addition, the user is provided with a score evaluation display device for evaluating the state of the song, such as the volume or beat status according to the user's song so as to objectively know their singing ability.

In general, the score evaluation display apparatus compares a preset reference voice signal reproduced by a voice reproducing apparatus with a song voice signal according to a song input by the user to evaluate a song state of the user and when the score according to the evaluation is finished, Display. Here, the reference voice signal refers to a signal in which the beat, pitch, volume, etc. are optimally recorded for the song.

However, most of the score evaluation display apparatuses that have been used conventionally have a problem that objectivity and reliability are inferior due to the incorrect evaluation and display of scores, unlike a user's singing ability.

Accordingly, techniques for more accurately evaluating user's singing ability have been proposed.

One such technique is US Pat. No. 5,038,658, issued August 13, 1991. Patent No. 5,038,658 discloses a technique for extracting pitch information and power information in one measure unit for volume information and evaluating its accuracy.

Another technique is Patent Application No. 92-15202 filed in the Republic of Korea in 1992 by the applicant of the present application. The patent application No. 92-15202 discloses a technique of detecting a volume difference and a beat difference by evaluating a song voice signal according to a user's song with a reference voice signal and evaluating a score according to its accuracy.

However, the above-mentioned U.S. Patent No. 5,038,658 and Korean Patent Application No. 92-15202 both propose more accurate score evaluation for the user's singing status, but both techniques display the score after the song ends. Accordingly, while the user was singing, the volume or accuracy of the beat could not be known. Therefore, it is difficult for the user to know which part of the song is wrong, and thus there is a problem in that the volume or the beat cannot be properly adjusted while singing. In addition, since only the volume difference or time difference is evaluated, there is a disadvantage in that a user cannot provide a volume state indicating a magnitude of a volume or a beat state indicating a slow or fast beat with respect to a reference voice signal.

Accordingly, an object of the present invention is to provide a song state display apparatus and method that can notify a user by evaluating the song state while the user is singing.

It is another object of the present invention to provide a song state display apparatus and method that can provide a user with a rhythm state indicating a volume state or a slow and fast beat of a volume relative to a reference sound signal while the user is singing. Is in.

In order to achieve the above object, the apparatus of the present invention detects a level corresponding to a volume of a singing voice signal according to a user's song and a preset reference voice signal, and compares the detected levels of the two signals to the reference voice signal. A song state detecting means for detecting the level difference of the song sound signal and a song state for determining the volume state according to the user's song by comparing the value of the detected level difference with a plurality of reference values set to different sizes in advance. Determination means and display means for displaying the determined volume state. In addition, the time signature detection means for detecting a phase corresponding to the beat of the singing voice signal and the reference voice signal, and comparing the detected phases of the two signals to detect the phase difference of the singing voice signal with respect to the reference voice signal, and the detected phase difference And a song state determination means for determining the beat state according to the user's song by comparing the value with a plurality of reference values set to different sizes in advance, and display means for displaying the determined beat state. And the song state determination means determines a volume state or a beat state periodically every predetermined time.

The method of the present invention for achieving the above object detects the level corresponding to the volume of the song audio signal and the reference audio signal and compares the levels of the two detected signals to detect the level difference of the song audio signal with respect to the reference audio signal A sound state detection process, a time state detection process for detecting a phase corresponding to the beat of the song audio signal and the reference sound signal, and comparing the phases of the two detected signals to detect a phase difference of the song sound signal with respect to the reference sound signal; A song state determination process of determining a volume and a beat state according to a user's song by comparing the detected level difference and the phase difference value with a plurality of reference values set to different sizes in advance, and the determined volume and beat state On Screen Display (OSD) control data corresponding to the process of generating the OSD, OSD image according to the OSD control data Generating a call to include a display process for displaying on a predetermined image display.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention, such as specific circuit configurations and components or operating times. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details.

1 is a block diagram of the song state display apparatus according to the present invention. In FIG. 1, first and second band pass filters (BPFs) 12 and 14 are band filter means, which are input in advance through a singing voice signal input through an input means such as a microphone according to a user's song. By bandpassing each of the set reference voice signals, unnecessary components are removed and only signals of a predetermined frequency band are extracted.

The volume state detection unit 48 is connected to the output terminals of the first and second BPFs 12 and 14, and the volume of the singing voice signal and the reference voice signal of a predetermined frequency band extracted from the first and second BPFs 12 and 14 are obtained. Detecting a level corresponding to, and comparing the detected levels of the two signals to detect the level difference of the singing voice signal with respect to the reference voice signal. The loudness state detection unit 48 detects the first and second level detectors 16 and 18 and the first and second level detectors 16 and 18 that detect the levels of the singing voice signal and the reference voice signal, respectively. First and second analog / digital converters (hereinafter, referred to as A / D converters) 20 and 22 for converting the levels of the digital data into digital data having values corresponding to the levels, and the first A / D converter 20. A subtractor 24 which subtracts the value of the output data of the second A / D converter 22 from the value of the output data of ") and outputs the subtracted value as a level difference value.

The time signature detector 50 is connected to the output terminals of the first and second BPFs 12 and 14, and is connected to the vocal sound signal and the reference sound signal of a predetermined frequency band extracted from the first and second BPFs 12 and 14. The phase difference of the singing voice signal with respect to the reference voice signal is detected by detecting the corresponding phase and comparing the detected phases of the two signals. The time signature detection unit 50 detects zero-cross points appearing in the singing voice signal and the reference voice signal, respectively, and generates first and second square wave signals corresponding to the detected zero-crossing points. The first square wave signal is compared with the phases of the first and second square wave signals generated by the zero crossing detection circuits 26 and 28 and the first and second zero crossing detection circuits 26 and 28, respectively. If the phase is earlier than the first phase difference pulse is generated during the phase difference period, and if the second phase difference pulse is generated during the phase difference period, the phase comparator 30 and the first, second output from the phase comparator 30 The first and second low pass filters (hereinafter referred to as LPFs) 32 and 34 for converting the phase difference pulses into low-pass filters and converting them into DC levels, respectively, and the first and second LPFs 32 and 34 are detected. Converted DC level into digital data having a value corresponding to each level, and converted digital data The third and fourth A / D converters 36 and 38 output the first and second phase difference values, respectively. Here, the phase comparator 30 uses a phase comparator disclosed in Patent Application No. 16893 filed in the Republic of Korea in 1990 by the applicant of the present application. Alternatively, you can use the MC4044 / 4344, an IC manufactured and sold by Motorola Inc. of the United States.

The microcomputer 40 is connected to the output terminals of the subtractor 24 and the third and fourth A / D converters 36 and 38. The microcomputer 40 performs the operation according to the flowchart of FIG. 5 to be described later. By comparing the level difference value and the first and second phase difference values detected by the state detection unit 50 with a plurality of reference values set to different sizes in advance, the volume state and the beat state according to the song of the user are determined and determined. Generates OSD control data corresponding to volume and time signature.

The OSD controller 42 generates an OSD image signal according to the OSD control data of the microcomputer 40 and applies it to the mixer 44.

The mixer 44 mixes the OSD image signal with a preset acid signal under the control of the OSD controller 42 and applies it to the image display unit 46. In this case, the preset video signal refers to a video signal reproduced from an image recording medium in order to display a video that changes according to the progress of the song as described above and provide a better sense of presence to the user.

The image display unit 46 displays a screen corresponding to the image signal output from the mixer 44. The image display unit 46 includes a display device such as a CRT.

In FIG. 1, a technology for displaying an OSD screen in an image screen by using the microcomputer 40, the OSD controller 42, and the mixing unit 40 is a general technology, for example, a patent application published on February 26, 1991. Patent Publication No. 91-1216 is described in detail in the character editing circuit using the on-screen, in the present invention is used to display the song state.

FIG. 2 is an operation waveform diagram of the volume state detector 48 of FIG. 1 and shows that the level difference So corresponding to the volume difference between the song voice signal Sv and the reference voice signal Sr is detected.

FIG. 3 is an operation waveform diagram of the beat state detection unit 50 of FIG. 1 and shows that the first phase difference L1 or the second phase difference L2 corresponding to the time difference between the song sound signal Sv and the reference sound signal Sr is detected.

4A and 4B illustrate an example of displaying the song state of the present invention on a screen of the image display unit 46. As shown in FIG.

FIG. 4A shows the volume state and the time signature state displayed on the screen of the image display unit 46. As shown in FIG. In FIG. 4A, the volume state indicates that the volume of the reference audio signal is displayed in one of a small state, a slightly smaller state, the same or approximate standard state, a slightly larger state, and a large state. The rhythm state indicates that the rhythm state is displayed in one of a slow state, a slightly slow state, a standard state that is the same or approximate, a slightly faster state, and a correct state with respect to the beat of the reference voice signal.

FIG. 4B shows a volume state and a beat state together with an image corresponding to a song on the screen of the image display unit 46. Referring to FIG. 4A, the volume indicates a standard state and the beat indicates a slightly faster state. Show what you are doing.

5 is a flowchart of the processing of the microcomputer 40 for evaluating and displaying the song state according to the present invention, which is periodically detected by the volume state detector 48 and the beat state detector 50 at regular intervals during a song. By comparing the values of the level difference and the phase difference with a plurality of reference values that are set to different sizes in advance, the volume state and the beat state according to the user's song are determined, and then the OSD control data according to the determined volume state and the beat state. It shows the operation to generate.

Hereinafter, a detailed description will be given with reference to FIGS. 1 to 5 attached to an operation example of the present invention.

First, the microcomputer 40 of FIG. 1 checks whether a start key is input in step 500 of FIG. Here, the start key refers to the song start button provided on the operation panel of the electronic song half cycle, and when the user selects a desired song by using the selection button of the electronic song half cycle and presses the start button, the selected accompaniment starts to play. . Since this is a conventional operation known in the electronic song half cycle, a detailed description thereof will be omitted. The microcomputer 40 detects the start key input by pressing the start button and starts counting the detection time in steps 502 to 506, and counts until the counted detection time count value reaches a preset reference value. do. In this case, the detection time is a time interval for detecting a user's singing state every predetermined time. The reference value is a value that is set to periodically detect the singing state of the user at a predetermined time. If the value is large, the detection period is long. If the value is small, the detection period is short. Therefore, it may be appropriately set in consideration of the user's taste.

In the above state, a song sound signal input through the input means is applied to the first BPF 12 and a reference sound signal reproduced from the recording medium is applied to the second BPF 14. Then, the first and second BPFs 12 and 14 band-pass the singing voice signal and the reference voice signal, respectively, and remove signals of unnecessary components, and extract only signals of a frequency band suitable for detecting only a volume state and a beat state. The pass frequency bands of the first and second BPFs 12 and 14 are set to, for example, 1 KHz band, and the accuracy of detection of the volume state and the beat state is deteriorated if the first and second BPFs 12 and 14 are not used. It may or may not be used as needed. The song audio signal output from the first BPF 12 is simultaneously applied to the first level detector 16 and the first zero crossing detection circuit 26, and the song audio signal output from the second BPF 14 is a second level detector ( 18) and the second zero crossing detection circuit 28 at the same time.

In the first and second level detectors 16 and 18, the levels of the singing voice signal and the reference voice signal are respectively detected. At this time, the first and second level detectors 16 and 18 detect the DC levels of the sine wave-like song sound signal Sv and the reference sound signal Sr as shown in FIG. Levels detected by the first and second level detectors 16 and 18 are applied to the first and second A / D converters 20 and 22, respectively, to be converted into digital data having values corresponding to the corresponding levels. The output data of the first A / D converter 20 is applied to the (+) input terminal of the subtractor 24 and the output data of the second A / D converter 22 is applied to the (-) input terminal of the subtractor 24. . The subtractor 24 then subtracts the value of the output data of the second A / D converter 22 from the value of the output data of the first A / D converter 20 and subtracts the value of the output data of the second A / D converter 22 to the microcomputer 40 as a level difference value. Is authorized. At this time, the output level difference value So of the subtractor 24 becomes 0 when the singing voice signal Sv and the reference voice signal Sr level are the same as in FIG. 2 (b), and the level of the singing voice signal Sv is the level of the reference voice signal Sr. If larger, the difference is positive. If the level of the singing voice signal Sv is smaller than the level of the reference voice signal Sr, the difference is negative. Therefore, as described later, the microcomputer 40 can determine the loudness state indicating the magnitude of the volume from the level difference value So output from the subtractor 24.

In addition, the first and second zero crossing detection circuits 26 and 28 detect zero crossing points of the song sound signal and the reference sound signal, respectively, and generate first and second square wave signals corresponding to the detected zero crossing points. At this time, the first and second zero crossing detection circuits 26 and 28 generate first and second square wave signals having the same period as the sinusoidal speech signal Sv and the reference speech signal Sr, respectively, as shown in FIG. do. The first square wave signal generated by the first zero crossing detection circuit 26 is applied to the comparison signal input terminal VF of the phase comparator 30, and the second square wave signal generated by the second zero crossing detection circuit 28 is the phase comparator. The reference signal input terminal RF of 30 is applied. Then, the phase comparator 30 compares the phases of the first and second square wave signals to generate a first phase difference pulse through the output terminal U or a second phase difference pulse through the output terminal D according to the comparison result. In this case, when the first square wave signal is out of phase with the second square wave signal, the first phase difference pulse is generated at a logic high while the phase difference appears through the output terminal U, and the first square wave signal is out of phase with the second phase difference pulse. In this case, the second phase difference pulse is generated at a logic high for the period in which the phase difference appears. The logic states of the output terminals U and D of the phase comparator 30 remain logic low when the first and second phase difference pulses are not output or when the phases of the first and second square wave signals are the same. The first phase difference pulse is converted into a DC level by low pass filtering in the first LPF 32, and the converted DC level is converted into digital data by the third A / D converter 36, and then the microcomputer 40 is used as the first phase difference value. Is applied to. The second phase difference pulse is converted into a DC level by low pass filtering in the second LPF 32, and the converted DC level is converted into digital data by the fourth A / D converter 38, and then the microcomputer 40 is used as the second phase difference value. Is applied to. Accordingly, the first phase difference value L1 output from the third A / D converter 36 is proportional to the degree of rapidity when the song sound signal Sv is ahead of the reference sound signal Sr as shown in FIG. It has a value of 0 and becomes 0 when the singing voice signal Sv is out of phase with or equal to the reference voice signal Sr. In addition, the second phase difference value L2 output from the fourth A / D converter 38 has a magnitude proportional to the degree of slowness when the singing voice signal Sv is ahead of the reference voice signal Sr as shown in FIG. It has a value and becomes zero when the singing voice signal Sv is out of phase with or equal to the reference voice signal Sr. Therefore, the microcomputer 40 can determine the time signature indicating the slowness or speed of the beat from the output first and second phase difference values L1 and L2 of the third and fourth A / D converters 36 and 38, as will be described later. Will be.

In the above state, the microcomputer 40 continuously applies the subtractor 24 from the subtractor 24 in step 508 when the detection time count value obtained by continuously counting the detection time in steps 502 to 506 reaches the reference value. The level difference value and the first and second phase difference values applied from the third and fourth A / D converters 36 and 38 are input. Then, the level difference value and the first and second phase difference values input in step 510 are evaluated to determine the volume state and the beat state. This will be described in more detail as follows. First of all, if the level difference value is positive, the user judges that the user sings louder than the standard voice signal. If the level difference value is less than the predetermined value, the standard state is determined. It is determined that the degree is proportional to the level difference value. If the level difference value is a negative value, it is determined that the user sings less than the reference voice signal, but when the level difference value is less than a predetermined value, it is determined as a standard state, and a small degree is determined to be proportional to the level difference value. If the level difference value is 0, it is determined as a standard state. Next, the determination process for the beat state is described. If the first phase difference value indicates a specific value and the second phase difference value is 0, the user judges that the user sings with a fast beat compared to the reference audio signal, but the first phase difference value is If it is below a certain value, it is determined as a standard state, and the degree of rapidity is determined to be proportional to the first phase difference value. When the first phase difference value is 0 and the second phase difference value has a specific value, it is determined that the user sings with a slow beat compared to the reference voice signal, but when the second phase difference value is less than or equal to the predetermined value, the standard phase is determined to be slow. It is determined that it is proportional to the second phase difference value. If both of the first and second phase difference values are 0, it is determined as a standard state. For example, assuming that the level difference value is within the range of -50 to +50, and the first and second phase difference values are within the range of 0 to 50, the volume state and the beat state are shown in Tables 1 and 2, respectively. Is determined as follows. That is, the volume state and the beat state according to the user's song are determined by comparing with a plurality of reference values which are set to different sizes in advance.

Thereafter, the microcomputer 40 determines the display state according to the volume state and the beat state determined as described above in step 512. The display state is determined as one of the display states as shown in FIG. 4A in correspondence with the volume state and the beat state according to the determination results as shown in Tables (1) and (2), respectively. In operation 514, OSD control data according to the display state is generated and applied to the OSD controller 42. Then, the OSD controller 42 generates an OSD image signal according to the OSD control data of the microcomputer 40 and applies it to the mixer 44, and the mixer 44 reproduces the OSD image signal from the image recording medium as described above. By mixing with the video signal and applying it to the video display unit 46, the volume and time status are displayed on the screen of the video display unit 46 together with the video corresponding to the music as shown in FIG. In Tables (1) and (2), the volume state and the time state are divided into five stages, and an example of determining any of them is given. However, the number of stages can be changed as necessary.

Next, the microcomputer 40 checks whether the song is ended in step 516 and, if it is in progress, performs the above-described operation again from step 502 and ends when the song ends.

Therefore, it is possible to display the volume state and the beat state according to the user's song periodically at regular intervals.

As described above, the present invention evaluates and displays the volume state or the beat state at every moment even while the user is singing. have.

Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications can be made without departing from the scope of the present invention. In particular, in the embodiment of the present invention has been illustrated to evaluate and display the volume state and the beat state of the user, it is also possible to evaluate and display only one of the song state as needed. In addition, although the exemplary embodiment of the present invention exemplarily displays and evaluates the volume state or the beat state at one moment periodically at a predetermined detection time, the volume state or the beat state may be averaged and displayed during the detection time. In this case, the level difference value and the first and second phase difference values may be applied to the microcomputer 40 after the arithmetic average of the respective detection times. In addition to displaying the evaluated song state on the screen, it may be displayed through a display means such as LED or LCD. Therefore, the scope of the invention should not be defined by the described embodiments, but should be defined by the equivalents of the claims and the claims.

Claims (19)

A song state display apparatus of an electronic singing half cycle for detecting and displaying a singing state from a difference between the singing voice signal and a preset reference voice signal, comprising: a means for generating a singing voice signal according to a user's singing; Volume state detection means for detecting a level corresponding to the volume of the signal and the reference audio signal, and comparing the levels of the two detected signals to detect the level difference of the song audio signal with respect to the reference audio signal, and the detected level difference A song state determination means for determining a volume state in accordance with the user's song with respect to the reference sound signal by comparing a value of? With a plurality of reference values previously set to different sizes; and a display for displaying the determined volume state. A song state display apparatus comprising a means. 2. The song state of claim 1, further comprising band pass filtering means for band-passing the song sound signal and the reference sound signal to extract only a signal of a predetermined frequency band and then providing the sound state detection means to the volume state detection means. Display. 3. The song state display apparatus according to claim 2, wherein the song state determination means determines the volume state periodically every predetermined time period. The said song state determination means judges that the said volume state is any one of a small state, a standard state, and a large state with respect to the volume of the said reference audio signal. Singing status indicator. In an electronic singing half cycle for detecting and displaying a difference between a singing voice signal generated according to a user's song and a preset reference voice signal, the phases corresponding to the beat of the singing voice signal and the reference voice signal are respectively detected and detected. Time phase detection means for detecting a phase difference of the song sound signal with respect to the reference sound signal by comparing the phase of the signal, and comparing the detected phase difference value with a plurality of reference values previously set to different magnitudes; And a song state determination means for determining a beat state according to a user's song, and a display means for displaying the determined beat state. 6. The song state of claim 5, further comprising band pass filtering means for band-passing the song voice signal and the reference voice signal to extract only a signal of a predetermined frequency band and providing the beat state detection means to the beat state detection means. Display. The said vocal state determination means judges the beat state as any one of a slow state, a standard state, and a fast state with respect to the beat of the reference audio signal. Singing status indicator. 8. A song state display apparatus according to claim 7, wherein said song state determination means determines the beat state periodically at predetermined time intervals. In the electronic singing half cycle for detecting and displaying the difference between the singing voice signal generated according to the user's song and the preset reference voice signal, the level corresponding to the volume of the singing voice signal and the reference voice signal is respectively detected and detected. A volume state detection means for detecting a level difference between the song sound signal with respect to the reference sound signal by comparing the level of the signal, and detecting a phase corresponding to the beat of the song sound signal and the reference sound signal, respectively; Time phase detection means for detecting a phase difference of the song sound signal with respect to the reference sound signal by comparing phases of the signal, and comparing the detected level difference and the value of the phase difference with a plurality of reference values set to different sizes in advance Song state determination means for determining a volume state and a beat state in accordance with the user's song; And display means for displaying the previously determined volume state and beat state on a video screen. 10. The apparatus of claim 9, further comprising band pass filtering means for band-passing the song sound signal and the reference sound signal, respectively, and extracting only signals of a predetermined frequency band and then providing the sound state detection means and the beat state detection means. Song state display device, characterized in that. The apparatus for displaying a song state according to claim 9 or 10, wherein said song state determining means periodically determines the volume state and the beat state at predetermined time intervals. A first and second level detectors for detecting the level between the song voice signal and the reference voice signal in an electronic singing half cycle for detecting and displaying the difference between the song voice signal generated according to the user's song and the preset reference voice signal. And first and second analog / digital converters for converting the levels of signals detected by the first and second level detectors into digital data having values corresponding to the levels, respectively, and the first analog / digital converters. A subtractor for subtracting the output data of the second analog / digital converter from the output data value of the output data and outputting the subtracted value as a level difference value, and detecting a zero crossing point appearing in the song audio signal and the reference audio signal, respectively. The first and second zero crossing detection circuits generating the first and second square wave signals corresponding to the detected zero crossing points, and the first and second zero crossing detection circuits, respectively. When the first square wave signal is out of phase with the second square wave signal, the first phase difference pulse is generated during the phase difference period and the second phase difference pulse is generated during the phase difference period. A generated phase comparator, first and second low pass filters for converting the generated first and second phase difference pulses into low level through low pass filtering, and a direct current detected by the first and second low pass filters. Third and fourth analog / digital converters for converting levels into digital data having values corresponding to the levels, and outputting the converted digital data as first and second phase difference values, respectively, and the level difference values and the first and second values. By comparing the second phase difference value with preset reference values, respectively, the volume state and the beat state according to the user's song are determined, and the on-screen device corresponding to the determined volume state and the beat state is determined. A control means for generating play control data, an on-screen display controller for generating an on-screen display video signal according to the on-screen display control data, a mixer for mixing the on-screen display video signal with a preset video signal, and And a video display unit for displaying a screen corresponding to the video signal output from the mixer. 13. The apparatus of claim 12, further comprising band pass filtering the song audio signal to extract only a signal having a predetermined frequency band, and then providing the first band pass filter to the first level detector and the first zero crossing detection circuit. And a second band pass filter for providing the second level detector and the second zero crossing detection circuit after extracting only signals of a predetermined frequency band by band pass filtering the signals, respectively. 15. The apparatus according to claim 12 or 13, wherein the song state determining means sets the volume state to any one of a small state, a slightly small state, a standard state, a slightly large state, and a large state with respect to the volume of the reference audio signal. And the beat state is determined as one of a slow state, a slightly slow state, a standard state, a slightly fast state, and a fast state with respect to the beat of the reference voice signal. Status display. 15. The song state display device according to claim 14, wherein the song state determination means determines the volume state and the beat state periodically at predetermined time intervals. The apparatus of claim 15, wherein the control means is a microcomputer. In the song state display method of the electronic singing half cycle to detect the difference between the singing voice signal generated according to the user's song and the preset reference voice signal and to display the singing state according to the detected difference, the singing voice signal and the reference voice A volume state detection process of detecting a level corresponding to the volume of the signal, and comparing the levels of the two detected signals to detect a level difference of the song audio signal with respect to the reference voice signal, and the singing voice signal and the reference voice signal Detecting a phase corresponding to the time signature of the beat and comparing the detected phases of the two signals to detect a phase difference of the singing voice signal with respect to the reference voice signal, and detecting the level difference and the value of the phase difference. Volume according to the user's song by comparing with a plurality of reference values set to different sizes in advance A process of determining a song state for determining a state and a beat state, a process of generating an on-screen display control data according to a display state after determining a display state corresponding to the determined volume state and a beat state, and the on-screen display control data And a display process of generating an on-screen display video signal and displaying the video signal on a preset video screen. 18. The method of claim 17, wherein the song state determination process determines the volume state and the beat state periodically at predetermined time intervals. 19. The apparatus of claim 18, wherein the song state determination process determines the volume state as any one of a small state, a slightly small state, a standard state, a slightly large state, and a large state with respect to the volume of the reference audio signal. And determining the beat state as one of a slow state, a slightly slow state, a standard state, a slightly fast state, and a fast state with respect to a beat of a reference voice signal. How to show status.