JP3595286B2 - Karaoke device with pitch shifter - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement of a karaoke apparatus with a pitch shifter that corrects the pitch (pitch) of a singer's singing voice, and more specifically, to match the pitch of a standard main melody, or increase or decrease the octave above or below the main melody pitch. The present invention relates to a processing method for performing correction in accordance with the following.
[0002]
[Prior art]
Japanese Patent No. 3179468 discloses a pitch for correcting the singing voice of a singer so that the voice of the singer has a harmonic relationship with the main melody data of the karaoke accompaniment music and falls within the same octave range as the voice of the singer. A shifter is disclosed. This detects the pitch of the singer's singing voice and the pitch of the main melody, and if this is the same octave range (the pitch is within one octave), corrects the pitch of the singing voice so that it becomes the pitch of the main melody, If they are separated, the pitch of the singing voice is corrected so that the pitch of the main melody is shifted one octave up or one octave down. According to this conventional technique, even if a sick person sings, the pitch is corrected within the same octave range as the singing voice.
[0003]
[Problems to be solved by the invention]
According to the above prior art, when a male artist sings a female artist's song, the pitch is generally converted to the male range and output.On the contrary, when a female artist sings a female artist's song, This is convenient because the pitch is converted to the female range and output.
[0004]
However, if a person who can only sing in a general range sings a song of an artist whose range is very wide, it is rather unwell. In such a song, the singer sings one octave lower than the range he can sing, and sings one octave lower than the range he or she is trying to sing. For example, when a woman sings a male artist's song, most of the song is sung one octave higher, but the treble range is returned to the pitch of the original song. Conversely, when a man sings a female artist's song, the majority of the song is sung one octave lower, but the low range returns to the pitch of the original song and sings. According to the above prior art, even in such a case, pitch conversion is performed faithfully in the same octave range as the singing voice, so that the continuity between the high range and the low range is interrupted, and a partial Even if it is a model song, it will be hard to hear as music as a whole.
[0005]
Therefore, the present inventors consider that the octave range at the time of singing is the most sung range for the singer, and the pitch of the singing voice is converted to the main melody in the octave range, and furthermore, the octave goes up and down during the song. I wondered if I could continually correct the pitch in the octave range at the time of singing. That way, the singer will be able to hear the music with a high degree of perfection in the natural range of the singer. The present invention has been made in this manner.
[0006]
[Means for Solving the Problems]
A karaoke apparatus with a pitch shifter according to the present invention is specified by the following items (A) to (E).
(A) A karaoke apparatus including a pitch detecting means, a pitch converting means, a central processing means, and an instruction pitch determining means. (B) The pitch detecting means sequentially converts a singing voice pitch from a singing voice signal inputted from a microphone. (C) the pitch conversion means converts the frequency of the input singing voice signal in accordance with the designated pitch determined by the designated pitch determination means (D) the central processing means plays the selected accompaniment music data (E) instructing the designated pitch determining means to determine an octave range for a predetermined period at the beginning of singing, while acquiring the main melody pitch from the accompaniment music data as the performance progresses. Compares the singing voice pitch with the main melody pitch and the pitch different from that by the octave according to the instruction of the octave range judgment of the central processing means. , Main melody pitch was determined to be approximate, or, at the same to determine the pitch of the octave difference as an indication pitch [0007]
Also preferably, when the octave range determining means cannot determine in the predetermined period at the beginning of the singing, the predetermined period can be extended, and in the predetermined period after the extension, the octave range determining means determines until the determination result is obtained. A karaoke device with a pitch shifter characterized by repeatedly extending a predetermined period.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a configuration of a karaoke apparatus with a pitch shifter according to an embodiment of the present invention. The basic configuration of this karaoke apparatus is the same as that of a conventional general karaoke apparatus. A central processing unit 1 corresponding to a personal computer main body and its peripheral devices, a hard disk drive 2, an operation control unit 3, a synthesizer 4, a video control unit And the like.
[0009]
The hard disk device 2 stores karaoke data of many songs and is managed as a karaoke database. The karaoke data includes karaoke accompaniment music data described in an electronic musical score format such as MIDI data, and lyric rendering data for displaying lyrics and changing colors in synchronization with the accompaniment music. In the present invention, the main melody part is included in the karaoke accompaniment music data, and data indicating the pitch of a sound to be uttered by the singer during the performance of the karaoke accompaniment music (this is referred to as the main melody pitch Pm) is described above. Can be obtained from the main melody part. Further, at the beginning of the singing of the karaoke accompaniment music data of the present invention, the relationship between the pitch of the sound actually sung by the singer (referred to as singing pitch Pv) and the main melody pitch Pm is a single pitch (in the same octave range). A judgment period data indicating a period for judging whether or not the sound is a double tone (hereinafter referred to as an octave region judgment period) is attached, and is output to an octave region judgment circuit 13 described later in synchronization with the karaoke accompaniment music. ing.
[0010]
When playing a certain music, the central processing unit 1 sequentially processes the karaoke accompaniment music data read in advance from the hard disk device 2 and expanded in the memory, and sequentially drives the synthesizer 4 to convert the audio signal of the karaoke accompaniment music. Generate. The signal of the karaoke accompaniment music is mixed and amplified with a singing voice signal to be described later by a mixing amplifier 6, and is output as sound from a speaker system 7. In parallel with this, the central processing unit 1 sequentially processes the lyric rendering data, generates graphics data of a lyric character string that changes color in synchronization with the progress of the karaoke accompaniment music in the video control unit 5, and generates the lyric. The character string is displayed on the display 8. Although detailed description is omitted, an appropriate moving image is displayed in the background of the lyrics character string.
[0011]
The singer holds the microphone 9 and sings while listening to the accompaniment music output from the speaker system 7 while watching the lyrics displayed on the display. The singing voice signal output from the microphone 9 is input to the pitch conversion circuit 11 via the microphone amplifier 10. As will be described in detail below, the pitch conversion circuit 11 converts the pitch of the singing voice signal from the microphone 9 to a pitch (designated pitch) provided from the selector 12, and outputs the converted pitch. The singing voice signal output from the pitch conversion circuit 11 is input to the mixing amplifier 6.
[0012]
The singing voice signal from the microphone amplifier 10 is also input to the pitch detection circuit 14. The pitch detection circuit 14 samples the input singing voice signal at an appropriate period to detect the fundamental frequency of the singing voice signal, and outputs the detected value (singing voice pitch Pv) as digital data. The pitch detecting circuit 14 detects a fundamental frequency of the input signal having a certain level of continuity, and appropriately sets its sampling characteristics and filtering characteristics so as to be insensitive to frequency fluctuations in a very short period. ing.
[0013]
The singing voice pitch Pv output from the pitch detection circuit 14 is input to three arithmetic circuits 15a, 15b, and 15c. The above-mentioned main melody pitch Pm given from the central processing unit 1 is also input to the arithmetic circuit 15a. The main melody pitch Pm is obtained by the central processing unit 1 acquiring from the karaoke data and sequentially acquiring the main melody pitch Pm from the karaoke data in parallel with the processing of the karaoke data by the central processing unit 1 as a main body and the performance of the accompaniment music and the generation of the lyrics character string. It is a stream of digital data indicating the pitch of the sound to be sung at each point in the karaoke accompaniment music performance time series. When acquiring the main melody pitch Pm, the central processing unit 1 calculates a pitch obtained by doubling the main melody pitch Pm (pitch one octave higher than the main melody pitch Pm) and inputs the same to the arithmetic circuit 15b. At the same time, a pitch obtained by halving the main melody pitch (a pitch one octave below the main melody pitch Pm) is also calculated and input to the arithmetic circuit 15c.
[0014]
The arithmetic circuits 15a, 15b, and 15c calculate the difference between the two input pitches, and output the value to the octave range determination circuit 13. That is, the difference between the singing voice pitch Pv and the main melody pitch Pm is output from the arithmetic circuit 15a. The difference between the singing voice pitch Pv and the pitch obtained by doubling the main melody pitch Pm is output from the arithmetic circuit 15b. Similarly, the difference between the singing voice pitch Pv and the pitch obtained by halving the main melody pitch Pm is output from the arithmetic circuit 15c.
[0015]
Outputs from the three arithmetic circuits 15a, 15b, and 15c are input to the octave range determination circuit 13. The octave range determination circuit 13 compares the outputs of the arithmetic circuits 15a, 15b, and 15c in the first octave range determination period at the beginning of singing that received the above-described determination period data, and determines the following.
{Circle around (1)} Whether the singing pitch Pv at the beginning of the singing starts is generally in a single pitch relationship with the main melody pitch Pm (whether the melody started singing in the same octave range as the main melody)
{Circle around (2)} Whether the singing pitch Pv at the beginning of the singing starts has a relationship of multiple intervals higher than the main melody pitch Pm as a whole (whether the singer started singing in a range one octave higher than the main melody).
{Circle around (3)} Whether the singing pitch Pv at the beginning of the singing starts has a relationship of multiple intervals lower than the main melody pitch Pm as a whole (whether the singer started singing in a range one octave lower than the main melody).
[0016]
When the octave range determination period at the beginning of singing has elapsed, and the octave range determination circuit 13 determines that the octave range is one of the above (1), (2), and (3), the determination circuit 13 supplies the selector 12 with three inputs. Is supplied. As a result, when the determination result is (1), the input (1) of the selector 12 is selected, and the main melody pitch Pm from the central processing unit 1 is input to the pitch conversion circuit 11 via the selector as the designated pitch. Is done. If the determination result is (2), the input (2) of the selector 12 is selected, and the pitch (Pm × 2) one octave higher than the main melody pitch Pm is instructed to the pitch conversion circuit 11 via the selector. Entered as pitch. Similarly, when the determination result is (3), the input (3) of the selector 12 is selected, and the pitch (Pm ÷ 2) one octave lower than the main melody pitch Pm is passed through the selector to the pitch conversion circuit 11. Is input as an instruction pitch.
[0017]
In the pitch conversion circuit 11 receiving the instruction pitch as described above, the singing voice signal from the microphone amplifier 10 is frequency-converted so that the pitch Pv of the singing voice signal matches the instruction pitch, and the singing voice signal thus pitch-shifted is converted. It is supplied to the mixing amplifier 6.
[0018]
The operation and effect of the pitch shift of the present embodiment described above in detail will be specifically described in accordance with actual karaoke singing with reference to the musical score of FIG. The first row in FIG. 2 is the main melody data, and the second row is a musical score of the singing melody intended by the singer. The third row is a musical score of the melody resulting from the pitch shift by the karaoke apparatus. Judgment period data is attached to the main melody data of the first line of the musical score, indicating that the first bar is an octave range judgment period.
[0019]
The singer thought the song was a high-pitch song, so I tried to sang the first measure one octave lower than the first line of the score. However, the range is lower than expected, and is likely to fall within the range that can be sung by the singer, so that the second bar to the third bar sing as the first row. In other words, sing with an octave higher than the first measure. However, the range of the song was still too high and slightly out of the range where the singer could sing, so I sang in the fourth measure again one octave lower than the first stage.
[0020]
In this case, after the octave range determination period (in this example, the first bar) has elapsed, the singer in the octave range determination circuit 13 sings in the first bar generally in the range of the melody one octave below the main melody. It is determined that there is. From the result of the determination, the selector 12 selects a pitch (input {3} of the selector 12) converted one octave below the main melody pitch as the designated pitch. After that, even if the song is sung according to the first line of the musical score as in the second bar to the third bar, or sung by one octave as in the fourth bar, the octave range determination circuit 13 no longer operates. The sound is output from the speaker system 7 so that the pitch is one octave lower than the first musical score regardless of the singing pitch Pv. Thus, the first bar and the fourth bar have a pitch substantially equal to the singing voice of the singer, and the second to third bars have a pitch approximately one octave lower than the singing voice, that is, the third bar of the musical score. In this way, it sounds as though the song is being sung one octave lower than the first line of the musical score throughout.
[0021]
During the octave range determination period, the singing voice signal of the singer may be directly output to the speaker system 7, or the pitch may be corrected according to the main melody Pm without octave conversion and then output.
[0022]
The octave range determination circuit 13 may use various determination methods. For example, the average value of the outputs of the three arithmetic circuits may be calculated during the determination period to select the minimum value. Alternatively, a threshold value may be defined in advance for the output of the arithmetic circuit, and an output larger than the threshold value may be ignored and excluded from the average value calculation element. The determination period data may be configured to be extendable, and may be extended when the octave range determination circuit 13 cannot determine for various reasons. For example, when the determination is impossible, the octave range determination circuit 13 automatically assigns several bars of determination period data, and determines the octave range in the octave range determination period indicated by the newly provided determination period data. To do. This may be repeated until a determination result is obtained.
[0023]
Alternatively, the pitch may be converted only when the difference between the singing voice pitch Pv and the designated pitch is smaller than a predetermined value (for example, a semitone). In this way, if the deviation of the pitch of the singing voice from the main melody or the octave-converted main melody is too large, the pitch is not converted, and the conversion is performed so as to correct the pitch only when the deviation is very small.
[0024]
Needless to say, the present invention is not limited to the above-described embodiment. For example, the pitch detection circuit 14, the operation circuits 15a to c, the octave range determination circuit 13, the pitch conversion circuit 11, and the signal of the selector 12 The processing functions and some of the functions of the central processing unit 1 can be realized solely by software using a single digital signal processor (DSP).
[0025]
【The invention's effect】
According to the karaoke apparatus according to the present invention, the pitch of the singing voice is converted into a pitch of the main melody to be sung or a pitch obtained by shifting the main melody by one octave up or down according to the octave range at the beginning of the singing of the singer. As a result, even if the singer sings while raising or lowering the difficult part by one octave, the singer's natural singing voice can be converted into a highly complete song, and the satisfaction that can only be enjoyed on the spot You can get along with others. As a result, the effect of increasing the number of people using karaoke can be expected.
[Brief description of the drawings]
FIG. 1 is a configuration example of a karaoke apparatus with a pitch shifter according to an embodiment of the present invention.
FIG. 2 is a reference diagram for specifically explaining the operation of one embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Central control device 2 Hard disk drive 3 Operation control unit 4 Synthesizer 5 Video control unit 6 Mixing amplifier 7 Speaker system 8 Display 9 Microphone 10 Microphone amplifier 11 Pitch conversion circuit 12 Selector 13 Octave range determination circuit 14 Pitch detection circuits 15a, 15b, and 15c Arithmetic circuit

Claims (2)

A karaoke apparatus comprising a pitch detection means (14), a pitch conversion means (11), a central processing means (1), and an instruction pitch determination means (12, 13),
The pitch detecting means (14) sequentially detects a singing voice pitch from a singing voice signal input from the microphone (9),
The pitch converting means (11) frequency-converts the input singing voice signal in accordance with the designated pitch determined by the designated pitch determining means (12, 13),
When causing the playing means (4) to play the selected accompaniment music data, the central processing means (1) sequentially acquires the main melody pitch from the accompaniment music data as the performance progresses, and sings for a predetermined period at the beginning of the singing. Instruct the designated pitch determination means (12, 13) to determine the octave range,
The instruction pitch determination means (12, 13) compares the singing pitch with the main melody pitch and a pitch different by an octave from the melody pitch in accordance with the octave range determination instruction of the central processing means (1), and determines that the main melody is approximated. A karaoke apparatus that determines a pitch or a pitch different from the pitch by an octave as an instruction pitch. The karaoke apparatus according to claim 1, wherein the pitch conversion means (14) outputs the input singing voice signal as it is until the designated pitch is determined.

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