JP2578089B2 - Singing ability evaluation device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a singing ability evaluation device that scores a singing with accompaniment as fairly as possible.

[Prior art] Sing a song with the accompaniment blown into the tape as a background,
The number of lovers of so-called karaoke performances is increasing, and the spread of karaoke machines is also remarkable. What is generally called a karaoke performance machine is mainly for playing music tapes in which accompaniment the singer desires is recorded in advance, but recently a singing ability evaluation device that evaluates the singing ability of the singer is attached. Some have also appeared.

This type of singing ability evaluation device plays music tapes in which the accompaniment and the singing of the model by the vocal or professional singer are separately blown into the left and right channels, and compares the singing of the singer obtained through the microphone with the singing of the sample. By adopting a method of evaluating singing ability, the method of comparison is from a highly specialized vocal technique to a simple one that simply checks for rhythm coincidence or disagreement. Various methods have been used.

[Problems to be solved by the invention]

The conventional singing ability evaluation device, for example, expands a singer's song obtained through a microphone into a musical score on a musical score,
Similarly, since the model song developed on the musical score on the score is evaluated after checking the difference in vocal music one note at a time, not only the complexity of the circuit configuration is unavoidable, but also the scoring evaluation There was a problem that it took too much time to lower the weight.

In addition, other conventional singing ability evaluation devices, when performing karaoke with only accompaniment tape music without a model singing, the singer's singing ability evaluation differs depending on the content of the accompaniment, and accurate singing ability There was a problem that it was not possible to evaluate

[Means for solving the problem]

The present invention solves the above-mentioned problem, and extracts a fundamental wave from which a singer whose singing ability is to be evaluated can sufficiently specify a fundamental pitch frequency from a voice sung along with an accompaniment. Extracting means, and converting the fundamental sound extracted by the extracting means into sounds within the same octave as the reference sound to be compared, and determining the frequency difference between the converted sound data and the reference sound data at a predetermined sampling period. And an evaluation circuit for evaluating the singing ability based on the moving average value of the deviation over several sampling periods.

[Action]

The present invention extracts a fundamental wave from which a fundamental pitch frequency can be sufficiently specified from a singer's voice to be evaluated, and converts the extracted fundamental wave voice into discrete values within the same octave as a reference voice to be compared. The frequencies are compared, and the comparison result is evaluated by the moving average method.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic circuit diagram showing an embodiment of a singing ability evaluation device according to the present invention, and FIG. 2 is a flowchart for explaining an operation program of the central processing unit shown in FIG.

In FIG. 1, a singing ability evaluation device 1 includes an evaluation circuit 2 having a microphone input terminal 2m and tape input terminals 21 and 2r of left and right channels, and a display device 3 for displaying an evaluation result of the evaluation circuit 2.
It is roughly composed of

The microphone input terminal 2m of the evaluation circuit 2 is connected to the RAM 7 via the microphone amplifier circuits 4 and 6 via the low-pass filtering circuit 5 having a filtering band of about 300 Hz and the waveform shaping circuit 6. The tape input terminal 21 of the left channel includes a tape amplifier circuit 8, a low-pass filter circuit 9 using an audible band as a filter band, and a waveform shaping circuit.
It is connected to RAM7 through 10. Further, the tape input terminal 2r of the right channel is connected to a preamplifier circuit 11, a tape amplifier circuit 12, and a low-pass filter circuit 13 that filters an audible band.
And the RAM 7 via a waveform shaping circuit 14.

The reason why the low-pass filtering circuit 5 for low-pass filtering the microphone input has a narrower filtering band than the others is because the basic pitch frequency of the singer's voice can be sufficiently specified by voice information up to about 300 Hz. is there.

In addition, each of the waveform shaping circuits 6, 10, and 14 amplifies the input signal and then clips a portion equal to or less than a predetermined threshold value,
The analog signal waveform is shaped into a digital signal waveform.

The RAM 7 stores the microphone input supplied through the three waveform shaping circuits 6, 10, and 14 and the two tape inputs as digital data, and exchanges data with the ROM 15. The ROM 15 is connected to a central processing unit 19 by a data bus 17 and an address bus 18 via a latch circuit 16, and the central processing unit 19 performs a process according to a predetermined processing procedure on the data read from the ROM 15. And sends data for driving the display device 3 back to the ROM 15.

The data for driving the display device 3 sent to the ROM 15 is transmitted to the drive circuit 20 for driving the display device 3 via the RAM 7.
21 and a voice synthesis circuit 22. Voice synthesis circuit 22
Synthesizes necessary instructions and precautions.

On the other hand, the display device 3 has a total scoring display unit 23 capable of displaying numbers from 0 to 199, and display units 24, 25, which mainly display five levels of treble, bass, and rhythm evaluations.
26, and the total scoring display section 23 has seven light emitting elements 8
In contrast to the configuration using three numeric display elements 23a arranged in a letter shape, the other three display sections 24, 25, and 26 each have five light emitting elements 27 arranged in a horizontal line, and It has a matrix structure in which the middle and lower stages are formed and arranged.

Each numeral display element 23a of the total scoring display section 23 is a drive circuit 2
The light-emitting elements 27 of the other display units 24, 25, and 26 are time-divisionally driven by the drive circuit 20 for each column and time-divisionally driven by the drive circuit 21 for each row. The drive circuit 21 drives each common side of the three numeral display elements 23a.

By the way, a tape recorder (not shown) for playing a music tape used for karaoke accompaniment inputs accompaniment and sample singing to the tape input terminals 2l and 2r of the left and right channels, respectively.

Next, the operation of the central processing unit 19, which is the center of the singing ability evaluation device 1, will be described with reference to FIG.

First, when the power of the singing ability evaluating apparatus 1 is turned on, it is determined whether or not a reset switch (not shown) is turned on in a step indicated by (101) in FIG. When the reset switch is on, in step (102), the display demo mode is selected, and various information displayed on the display device 1 is appropriately displayed.

If the reset switch is off, the previous singer's scoring display remains, so in step (103) it is determined whether the scoring display is valid or invalid. Then, the ON / OFF of the reset switch is determined again. Steps (103) to (108) are called an idle mode.
If there is an ON determination in 04), the system will be ready for scoring, and in step (105), the display device 3 will be in a normal blink state. In the normal blink state,
The comprehensive scoring display 23 displays 100 points, and the display 24, 2
Each of the light emitting elements 27 of 5, 26 repeats blinking at a constant rhythm.

Next, the presence or absence of tape input of the accompaniment music is determined in step (10).
It is checked by the presence / absence of a signal input to the left channel tape input terminal 21 in 6). If there is a signal input, the determination as to whether there is pop noise in step (107) and the determination as to the tape running mode in step (108) are made. Then, a high-speed blink state is reached in step (109). Whether or not the tape input is pop noise is determined based on the duration of the tape input or the like. Also, in the tape running mode, it is determined whether fast forward or rewinding is in progress, and the process returns to step (105) during special playback such as cue or review.
In the case of a normal playback only machine without special playback function,
Step (108) can be omitted.

In step (109), when the display device 3 enters the high-speed blinking state, in the following step (110), the presence or absence of a signal input to the tape input terminal 2r of the right channel, that is, whether or not the singing of the model singer has started Is checked. When the start of the singing is determined, it is determined in step (111) that the singing is not noise, and when it is determined in step (112) that the reset switch is kept off, the singing is substantially started for the first time. Shift to the sample mode for collecting data necessary for scoring.

In the sample mode, first, in step (113), the first data for the left and right tape inputs stored in the RAM 7 is cleared. Next, in step (114), the presence / absence of left and right tape inputs is checked. If there is left / right tape input, in step (115), second data is sampled for the right channel tape input. At (116), the second data is sampled for the microphone input.

In a step (117) following the step (116), the first data and the second data are octave-converted so that the sound is in the same octave for the tape input and the microphone input.

This octave conversion is performed between the tape input and the microphone input. In the following step (118), the octave conversion is performed between the tape input and the microphone input, and the microphone input is converted to a sound in the same octave as the tape input. Is converted.

In the step (119), the frequency of the tape input and the microphone input in which the frame of comparison is narrowed to the necessary minimum by the two octave conversions are shifted in synchronization with the sampling period, that is, the pitch shift is detected. . By the way, since only the fundamental wave is extracted by the low-pass filtering circuit 5 before the microphone input is supplied to the RAM 7, an unnecessary signal component causing a malfunction in detecting a shift in pitch is extremely small. Few. Therefore, the comparison between the octave-converted fundamental sound and the reference sound given as the tape input is performed by making the best use of the minimum necessary data.

The difference between the frequency of the tape input and the frequency of the microphone input detected in step (119) is moving averaged over several sampling periods in the following step (120).
By this moving average processing, exceptional data for evaluating the singing ability is diluted, and the objectivity and fairness of the evaluation can be improved.

Step (121) is a step for changing the thresholds of the high range and the low range in accordance with the range of the singer in evaluating the singing ability separately in the high range and the low range. Performed dynamically.

During the singing, the display units 24 and 26 of the display device 3 change the display in accordance with the pitch change of the tape input and the microphone input, respectively, and serve as a singing guide on the rhythm. Blink for step (12
It is performed in 2). The above steps (113) to (122) constituting the sample mode are repeatedly performed until the left and right tape inputs disappear, and when it is determined in step (114) that the left and right tape inputs have disappeared, the step (113) is performed. The mode shifts to an end check mode consisting of (123) and (124), and a scoring mode that follows. In the end check mode, the left and right tape inputs disappear in steps (12
After confirming in 3), it is checked that the tape end has been reached through a step (124) having a wait of 3 seconds.

In step (124), when the end of the reproduction of the tape is confirmed, first, in step (126), the total score result of the singing ability is displayed on the total score display section 23 of the display device 3 by 100.
It is displayed at some points out of perfect scores. Step (12
In step (127) following 6), the singing ability evaluation and the rhythm evaluation in the high and low ranges are displayed on the display units 24, 25, and 26 of the display device 5 in five stages.

As described above, the singing ability evaluation device 1 extracts a fundamental wave from the voice of the singer to be evaluated via the low-pass filtering circuit 5, and extracts the fundamental wave from the central processing unit 19 in the evaluation circuit 2.
The octave is converted into the same octave as the reference sound to be compared with the reference sound, the frequency deviation between the fundamental wave and the reference sound is detected at a predetermined sampling period, and this deviation is moving averaged over several sampling periods, and the moving average result is obtained. The singing ability is evaluated based on the singing ability, and the two elements of pitch and rhythm required for the singing ability evaluation of the singer are compared to the minimum necessary, and the minimum required data is maximized. Can be evaluated by utilizing it, and exceptional data is eliminated, so that fair and accurate evaluation can be performed in a short time, and it can be manufactured at low cost without complicating the configuration. .

〔The invention's effect〕

As described above, according to the present invention, a fundamental wave is extracted from the voice of a singer to be evaluated, and this fundamental wave is
Octave conversion is performed within the same octave as the reference sound used as the reference for comparison, the frequency difference between the fundamental wave and the reference sound is detected at a predetermined sampling period, and this difference is moving averaged over several sampling periods. The singing ability is evaluated based on the configuration, so the two elements of pitch and rhythm necessary for the singing ability evaluation of the singer, while minimizing the frame of comparison and minimizing the minimum necessary data It can be evaluated by utilizing it, and exceptional data is eliminated, so that fair and accurate evaluation can be performed in a short time, and it can be manufactured at low cost without complicating the configuration. It has an excellent effect.

[Brief description of the drawings]

FIG. 1 is a schematic circuit diagram showing an embodiment of a singing ability evaluation device according to the present invention, and FIG. 2 is a flowchart for explaining an operation program of the central processing unit shown in FIG. 1 ... singing ability evaluation device, 2 ... evaluation circuit, 5 ... low-pass filtering circuit.

Claims (1)

(57) [Claims] An extraction means for extracting a fundamental wave from which a singer whose singing ability is to be evaluated sung along with an accompaniment can specify a fundamental pitch frequency, and the extraction means extracts the fundamental wave. The converted fundamental sound is converted into a sound in the same octave as the reference sound used as the reference for comparison, the frequency difference between the converted sound data and the reference sound data is detected at a predetermined sampling period, and the above-mentioned sound is detected over a number of sampling periods. A singing ability evaluation device, comprising: an evaluation circuit for evaluating singing ability based on a moving average value of the deviation.