JP3663681B2 - Vibrato addition device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibrato adding device for adding vibrato as a music effect to a singing voice signal.
[0002]
[Prior art]
Vibrato, which is one of singing techniques, is a technique that gives vibrations of minute frequencies and amplitudes to a singing sound, and can give an expression to a particularly long extended sound. If you don't apply vibrato when singing long notes, the change in sound will be poor and the singing will tend to be monotonous. The vibrato also has an effect of cheating a certain amount of pitch deviation, and the singer can have a psychological margin that the singing pitch may be somewhat shifted by applying the vibrato.
[0003]
However, vibrato is an advanced singing technique, and it is not easy to learn it, so as a device to be applied to karaoke devices etc., vibrato is electrically added to the singing voice signal input from the microphone A vibrato adding device has been proposed.
[0004]
[Problems to be solved by the invention]
However, the previously proposed vibrato adding device is a device that only mechanically adds a certain amount of vibrato, so that the vibrato gives a mechanical impression, and on the contrary, the performance effect of the song. There was a drawback of lowering. Also, in electronic musical instruments, etc., a function that can be used to modulate the vibrato of a musical tone using a modulation wheel etc. has been put into practical use, but this function is a function that is manually controlled by a player who is proficient in playing, It was not suitable for vibrato control of general karaoke singers.
[0005]
An object of this invention is to provide the vibrato addition apparatus which can apply moderate vibrato according to a song voice.
[0006]
[Means for Solving the Problems]
The invention of claim 1 estimates the duration of the same sound based on the correlation detected by the correlation detection means for detecting the correlation of the input singing voice signal for each period, and the duration is constant. Trigger generating means for generating a trigger signal instructing the start of addition of vibrato when the time is over, and vibrato for adding vibrato to the singing voice signal in response to the trigger generating means generating a trigger signal And adding means.
The invention of claim 2 is the invention of claim 1, further comprising vibrato waveform storage means for storing a vibrato waveform, wherein the vibrato adding means modulates the singing voice signal with the vibrato waveform read from the vibrato waveform storage means It is characterized by doing.
According to a third aspect of the present invention, in the first and second aspects of the invention, the vibrato adding means controls a change in the depth of the vibrato added to the singing voice signal based on the pitch of the singing voice signal. Features.
According to a fourth aspect of the present invention, in the first to third aspects of the invention, the vibrato adding means determines a maximum depth of vibrato to be added to the singing voice signal based on a volume of the singing voice signal. And
The invention according to claim 5 is the table according to claim 1, wherein the vibrato adding means determines the maximum depth of vibrato added to the singing voice signal based on the volume of the singing voice signal, the singing A table for determining a period of vibrato added to the singing voice signal based on the pitch of the singing voice signal, and a depth of the vibrato added to the singing voice signal based on the pitch of the singing voice signal is the maximum depth. A table for determining the time to reach, and controlling the vibrato added to the singing voice signal based on the maximum depth, period, and time to reach the maximum depth determined using the table Features.
[0007]
In the above structure, it adds vibrato singing voice signal when the duration of the same sound is equal to or more than a predetermined time. Thereby, even if a singer sings without vibrato , vibrato can be automatically applied to the note most suitable for the singing.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram of a karaoke system including a vibrato adding device to which the present invention is applied. This karaoke system includes a karaoke device main body 1, the vibrato adding device 2, a singing microphone 3, a stereo speaker 4, a monitor 5, and a scoring machine 6. The karaoke apparatus main body 1 stores therein a plurality of pieces of music data that are data for karaoke performance, and automatically reads out one of the music pieces according to the user's selection. The vibrato adding device 2 gives an effect such as vibrato to the singing voice signal input from the microphone 3 and inputs it to the karaoke device main body. The karaoke apparatus main body 1 mixes the karaoke accompaniment sound signal and the singing voice signal, gives an effect such as echo, and outputs it to the stereo speaker 4. The music data also includes lyrics display data and data for displaying a background video. Based on these data, the karaoke apparatus main body 1 displays on the monitor 5 a superimposed lyrics telop on the background video. Further, the scoring machine 6 compares the guide melody data input from the karaoke device main body 1 with the pitch data of the singing voice signal input from the vibrato adding device 2, and calculates the score based on the degree of the coincidence. indicate.
[0009]
FIG. 2 is a schematic block diagram of the karaoke apparatus main body 1. The music data storage device 10 is composed of a hard disk device or the like, and stores thousands of music data therein. The performance execution unit 11 reads the music data from the music data storage device 10 based on the music selection input from the user. The user's music selection input is performed using a remote controller or the like. The performance executing unit 11 executes the karaoke performance by sequentially sending the read music data to the musical tone forming unit 12 and the image creating unit 13. The musical tone forming unit 12 includes a sound source device and the like, and forms a musical tone signal based on the input music data. The image creating unit 13 generates a lyric character pattern based on the lyric information input from the performance executing unit 11. The image creation unit 13 has a background video playback device such as an LD player inside. When performing karaoke, the image creation unit 13 reads the background video from the background video playback device and synthesizes the background video and the character pattern of the lyrics. To create a display image. The created image is output to the monitor 5. On the other hand, the karaoke performance sound formed by the musical tone forming unit 12 is output to the mixer 14. The singing voice signal to which an effect such as vibrato is given by the vibrato adding device 2 is input to the mixer 14. The mixer 14 distributes these signals to the left and right channels at appropriate levels. The distributed stereo signal is D / A converted and amplified by the sound system 15 and then output to the speaker 4. The performance execution unit 11 reads the data of the guide melody track included in the music data in synchronization with the progress of the music and outputs this data to the scoring machine 6.
[0010]
FIG. 3 is a block diagram of the vibrato adding device 2. The singing microphone 3 is connected to a microphone amplifier 20. The microphone amplifier 20 amplifies the singing voice signal input from the microphone 3 to a level that can be processed inside the apparatus. The amplified singing voice signal is input to the A / D converter 21. The A / D converter 21 converts the input signal into digital data and inputs it to the voice analysis DSP 22 and the effect DSP 24. The voice analysis DSP 22 detects the pitch and volume, and further detects the duration of the same sound based on the detected pitch. Information on the pitch, volume, and duration of the same sound is input to the vibrato signal generator 23.
[0011]
The vibrato signal generator 23 determines conditions such as the frequency, depth and timing of generation of the vibrato signal, and the envelope based on the input pitch, volume and duration information of the same sound, and based on these conditions. Generate a vibrato signal. The generated vibrato signal is input to the effect DSP 24.
[0012]
The effect DSP 24 adds vibrato to the singing voice signal by the input vibrato signal. Vibrato is frequency modulation of a singing voice signal and minute amplitude modulation synchronized with the frequency modulation. That is, modulation is performed synchronously with the same vibrato signal waveform so that the amplitude is increased by amplitude modulation when the frequency is increased by frequency modulation, and the amplitude is decreased when the frequency is decreased. At this time, both depths are adjusted so that the degree of amplitude modulation is smaller than the degree of frequency modulation in terms of hearing. Note that the effect DSP 24 can add not only vibrato but also various effects such as reverb and chorus to the singing voice signal.
[0013]
The functions of the voice analysis DSP 22, the vibrato signal generator 23, and the configuration DSP 24 will be described in detail with reference to FIG. In this figure, each function is described as a block, but each function is realized by a microprogram. In the voice analysis DSP 22, first, the pitch detection unit 30 and the volume detection unit 31 detect the pitch and volume of the singing voice signal. The pitch detection may be an instantaneous value or an average value, and the volume detection may be a peak value or an average value. The period cutting unit 32 calculates the time of one period of the voice signal waveform based on the detected pitch, and cuts out waveform data of this length from the singing voice signal. The extracted waveform data is input to the delay 34 and the correlation detection unit 33. The correlation detection unit 33 also receives waveform data for one period from the delay 34. The waveform data input from the delay 34 is one cycle before the waveform data directly input from the period cutout unit 32. The correlation detection unit 33 compares the (current) waveform data directly input from the period cutting unit 32 with the (previous) waveform data input from the delay 34, and if the shapes are substantially the same. It is determined that the same sound is sustained, and if the shapes are completely different, it is determined that the sound has changed. This determination result is output to the vibrato trigger generator 40 of the vibrato signal generator 23. The pitch data detected by the pitch detection unit 30 is output to the vibrato frequency determination unit 41 and the vibrato EG determination unit 42 of the vibrato signal generator 23. The volume data detected by the volume detection unit 31 is output to the depth determination unit 43 of the vibrato signal generator 23.
[0014]
In the vibrato signal generator 23, the vibrato trigger generator 40 counts the duration of the same sound, and generates a vibrato trigger signal when this exceeds a certain time. This vibrato trigger signal is input to the vibrato signal generator 45. When the vibrato trigger signal is input, the vibrato signal generation unit 45 gives the vibrato frequency, EG (time to reach the maximum depth) to the vibrato frequency determination unit 41, the vibrato EG determination unit 42, and the depth determination unit 43. ) And the maximum depth parameters are determined, and the determined vibrato frequency, EG and maximum depth parameters are read. The vibrato signal generation unit 45 accesses the vibrato waveform memory 44 based on these parameters, and generates a vibrato signal by reading the waveform data. An example of the parameters and the vibrato waveform is shown in FIG. As the waveform data stored in the vibrato waveform memory 44, a waveform calculated by calculation such as a sine wave or a triangular wave may be used. It may be. Further, instead of the vibrato waveform memory 44, an arithmetic unit for calculating a waveform value of a sine wave or a triangular wave may be provided.
[0015]
The vibrato signal generated by the vibrato signal generation unit 45 is input to the modulation unit 50 of the effect DSP 24. In the modulation part 50, frequency modulation and amplitude modulation by vibrato signals are applied to the singing voice signal.
[0016]
The vibrato frequency determining unit 41, the vibrato EG determining unit 42, and the depth determining unit 43 are provided with parameter conversion tables shown in FIGS. 5A, 5B, and 5C, respectively, and input parameters (pitch The output parameters (vibrato frequency, EG and maximum depth data) are determined by looking up this table with data or volume data. According to the parameter conversion table of FIG. 5A, the vibrato frequency is set higher as the pitch is higher. That is, the vibrato frequency is also controlled in accordance with the singing frequency (pitch). Further, according to the parameter conversion table of FIG. 3C, the maximum vibrato depth is set to be larger as the singing volume is higher. That is, the song volume and the vibrato depth are associated with each other. Furthermore, according to the parameter conversion table of FIG. 10C, the value of vibrato EG is set larger as the singing pitch is higher. The value of vibrato EG is a speed until the maximum depth determined by the parameter conversion table in FIG. Thereby, the change speed of the vibrato depth is associated with the singing pitch.
[0017]
Note that the vibrato trigger signal is generated when the duration of the same sound exceeds a certain time, because adding a vibrato to a fine sound makes it seem that the pitch is not stable. This is because vibrato is added only to the sound.
[0018]
In the said embodiment, since it is an apparatus inserted and connected between a karaoke apparatus main body and a microphone, it can be used in addition to an existing karaoke apparatus. In addition, you may make it incorporate in a karaoke apparatus.
[0019]
【The invention's effect】
As described above, according to the present invention, vibrato is controlled in accordance with the state of the singing voice signal, so that vibrato that is not mechanical but expressive can be added.
[0020]
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a karaoke system to which the present invention is applied. FIG. 2 is a schematic configuration diagram of a karaoke device main body used in the karaoke system. FIG. 3 is a block diagram of a vibrato adding device used in the karaoke system. FIG. 4 is a functional block diagram of the vibrato adding device. FIG. 5 is a diagram showing the contents of a parameter conversion table used in the vibrato adding device.
1-karaoke device body, 2-vibrato adding device,
22-DSP for voice analysis, 23-Vibrato signal generator,

Claims (5)

Correlation detecting means for detecting a correlation for each cycle of the input singing voice signal;
Trigger generation means for estimating the duration of the same sound based on the correlation detected by the correlation detection means, and generating a trigger signal instructing the start of addition of vibrato when the duration exceeds a certain time;
Vibrato adding means for adding vibrato to the singing voice signal in response to the trigger generating means generating a trigger signal;
A vibrato adding device characterized by comprising: Vibrato waveform storage means for storing vibrato waveforms;
The vibrato adding apparatus according to claim 1, wherein the vibrato adding means is means for modulating the singing voice signal with a vibrato waveform read from the vibrato waveform storage means. The vibrato adding device according to claim 1 or 2, wherein the vibrato adding means controls a change in the depth of vibrato added to the singing voice signal based on a pitch of the singing voice signal. 4. The vibrato adding device according to claim 1, wherein the vibrato adding means determines a maximum vibrato depth to be added to the singing voice signal based on a volume of the singing voice signal. 5. The vibrato adding means is:
A table for determining the maximum depth of vibrato to be added to the singing voice signal based on the volume of the singing voice signal, a table for determining a period of vibrato to be added to the singing voice signal based on the pitch of the singing voice signal; And a table for determining the time until the depth of the vibrato added to the singing voice signal reaches the maximum depth based on the pitch of the singing voice signal,
The vibrato adding device according to claim 1 or 2, wherein a vibrato added to the singing voice signal is controlled based on a maximum depth, a period, and a time until the maximum depth is determined using the table.

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