JPH0438354B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is used with an audio signal recording and reproducing device such as a ``karaoke device'' to convert an audio signal sung by a user into a reproduced audio signal from a reference magnetic tape or the like. The present invention relates to a scoring device that automatically scores a user's singing ability by comparing it with the user's singing ability.

Configuration of conventional examples and their problems As a field of audio equipment, music signals played by instruments such as musical instruments recorded on recording media such as magnetic tape are reproduced and expanded, and when a user sings along with this, the above-mentioned music is reproduced. There is what is commonly called a ``karaoke device,'' which mixes with the signal and amplifies the sound, and is widely used for home and business use.

By singing using the above-mentioned "karaoke device," the user can gain joy and satisfaction, but in recent years, the number of people who want to improve their singing ability has increased, and the number of people who want to improve their singing ability has increased. Some people receive guidance from a singing teacher, but this is not possible for everyone, and one way to study singing on your own is to use an audio multiplexing method such as magnetic tape called ``audio multiplex tape.'' recording media are rapidly becoming popular. For example, in the case of a magnetic tape, this audio multiplexing type recording medium is a first track 101 on a magnetic tape 1, as shown in FIG.
A vocal signal from a singer or the like is sent to the second track 1.
02 are recorded with musical signals played by musical instruments, etc., respectively. When using this magnetic tape, an audio multiplexing type "karaoke apparatus" having the configuration shown in FIG.
01 and an amplifier 202, and a second tape reproducing means 3 consisting of a magnetic head 301 and an amplifier 302,
These two outputs are mixed and power amplified by a mixing amplifier 5 together with the output of a microphone input means consisting of a microphone 401 and an amplifier 402, and outputted from a speaker 6 as an acoustic signal.

It is said that you can improve your singing ability by listening to vocal signals recorded on a recording medium using the above device and practicing singing along with the vocal signals yourself, but no matter how much you practice, However, the drawback is that users themselves cannot tell how close their own singing style is to the modeled vocal signal, in other words, how much their singing ability has improved. Also, even if the user sings in the wrong way, the user may not be aware of it, and when practicing individually, there will naturally be a limit, and the user will lose interest and lose the desire to practice. It had the disadvantage that it was often

Purpose of the invention The present invention solves the above-mentioned conventional problems.
The vocal signal recorded on an audio multiplex recording medium etc. is compared with the user's singing voice signal, and the degree of matching is calculated and displayed as a score, which serves as an objective evaluation method for the user's singing ability. ,
In particular, it is an object of the present invention to provide a scoring machine that more accurately calculates the degree of matching as a score.

Structure of the Invention The scoring device of the present invention includes a first scale change detection means for detecting a change in the pitch of a scale of a first audio signal to be input, and a change in pitch of a scale of a second audio signal to be input. a second scale change detection means for detecting the number of pitch changes in the scale of the first audio signal; a first counting storage means for counting and storing the number of pitch changes in the scale of the first audio signal; a second count storage means for counting and storing , a first pause detection means for detecting a no-signal portion of the first audio signal, and a second pause detection means for detecting a no-signal portion of the second audio signal. and,
a third counting storage means for counting and storing the number of times a pause is detected by the second pause detection means; Pause simultaneous release detection means detects whether or not the pause of the first audio signal is also canceled at substantially the same time by looking at output information of the detection means; a fourth count storage means for counting and storing the number of times that the pause simultaneous release detection means detects that the pause is almost simultaneously released, and the information stored in the first count storage means and the information stored in the second count storage means. The first audio signal is compared with the information stored in the second counting storage means, and the first audio signal is compared with the information stored in the fourth counting storage means. a first rectifying means for rectifying the first audio signal; a first rectifying means for rectifying the first audio signal;
a first integrating means for integrating the rectified voltage of the rectifying means; and a second integrating means for integrating the rectified voltage of the first rectifying means with a time constant different from the time constant of the first integrating means; The output voltage of the first integrating means and the second
a first comparator that compares the output voltage of the integrating means; and each time a first audio signal is generated by the first comparator, a first pulse approximately corresponding to the generation is taken out, and a second a second rectifying means for rectifying the audio signal; a third integrating means for integrating the rectified voltage of the second rectifying means; and a third integrating means for integrating the rectified voltage of the second rectifying means;
a fourth integrating means for integrating the rectified voltage of the rectifying means; a second comparator for comparing the output voltage of the third integrating means with the output voltage of the fourth integrating means; The device includes a non-coincidence detection means which extracts a second pulse corresponding to the occurrence each time the occurrence occurs, and inputs the first pulse and the second pulse. The score is calculated based on how well the first audio signal matches the user's singing audio signal, and the second audio signal matches the reproduced audio signal of the vocal signal recorded on the recording medium that serves as a song model. , the user can recognize the level of his or her singing ability compared to the vocal signal on the recording medium.

DESCRIPTION OF THE EMBODIMENT FIG. 3 is a block diagram showing an embodiment of the present invention. 4 is a microphone input means for converting the user's singing voice into an electrical signal and amplifying it; 401 is a microphone; and 402 is an amplifier. 2 is a first magnetic tape reproducing means for reproducing a vocal signal recorded on an audio multiplexing recording medium; 201 is a magnetic head; and 202 is an amplifier. Reference numeral 7 denotes a first waveform converting means, which converts the voice sung by the user into a pulse signal. Reference numeral 8 denotes a second waveform converting means, which converts the vocal signal of the recording medium into a pulse signal. Reference numeral 9 denotes a first scale change detection means, which detects changes in the scale of the voice sung by the user. Reference numeral 10 denotes a second scale change detection means, which detects a change in the scale of the vocal signal. Reference numeral 11 denotes a first counting storage means, which counts and stores the number of changes in pitch of the pitch of the voice sung by the user. Reference numeral 12 denotes a second counting storage means, which counts and stores the number of changes in pitch of the scale of the vocal signal.

Reference numeral 13 denotes a first pause detection means, which detects pauses caused by breaths or the like in the user's singing voice. Reference numeral 14 denotes a second pause detection means, which detects a pause due to a pause or the like in the vocal signal on the magnetic tape. Reference numeral 41 denotes a third counting storage means, which counts and stores the number of pauses in the vocal signal on the magnetic tape based on the output of the second pause detection means. Reference numeral 15 denotes a pause simultaneous release detection means, which detects when the pause in the vocal signal is canceled, that is, when the vocal signal changes from a no-signal state to a signal-present state, the audio signal sung by the user is also released from the pause at approximately the same time. This is to detect whether or not. Reference numeral 16 denotes a fourth counting storage means for counting and storing the number of times that the pause simultaneous release is detected by the pause simultaneous release detection means.

17 is a score calculation means that compares and calculates the number of changes in the pitch of the voice sung by the user and the number of changes in the pitch of the vocal signal; A score is calculated based on the degree to which the audio signal sung by the user matches the vocal signal on the magnetic tape based on the ratio of the number of times the audio signal sung by the user is detected to be released from a pause almost at the same time as the pause is released. , 42 is a first rectifying means that rectifies the first audio signal.

43 is a first integrating means, and 44 is a second integrating means, which integrate the rectified voltage of the first rectifying means 42, and have different time constants. 4
Reference numeral 5 denotes a first comparator which compares the output voltages of the first integrating means and the second integrating means, and each time a first voice signal is generated, the first comparator 5 compares the output voltage of the first integrating means and the second integrating means. It extracts the pulse of 46 is a second rectifying means for rectifying the second audio signal. 47 is a third integrating means, and 48 is a fourth integrating means, which integrates the rectified voltage of the second rectifying means 46, and each has a different time constant. The time constants of the first integrating means and the third integrating means, and the time constants of the second integrating means and the fourth integrating means are set to approximately the same value.

Reference numeral 49 denotes a second comparator which compares the output voltages of the third integrating means and the fourth integrating means, and each time a second voice signal is generated, a second It extracts the pulse of

Reference numeral 50 denotes a non-coincidence detection means, which receives the first pulse and the second pulse, takes out the output during the period when the first pulse and the second pulse are different, and converts the first waveform. The output of the means is erased. Therefore, if there is a difference in the utterance timing of the first audio signal and the second audio signal, the non-coincidence detection means 50 will generate an output for a certain period of time, and the first audio signal will be erased.
The first audio signal system is the same as the no-signal state. This allows a more accurate score to be calculated based on how much the user's singing voice signal matches the magnetic tape's vocal signal.

FIG. 4 is a block diagram and a circuit diagram showing the specific configuration of this embodiment, which includes detecting pitch changes in the user's voice and counting and storing the number of changes, detecting pitch changes in the vocal signal and counting and storing the number of changes, Detection of a pause in the vocal signal, counting and storing the number of times it has been detected, detecting a pause in the user's singing signal, detecting the cancellation of the pause in the user's singing signal almost simultaneously with the cancellation of the pause in the vocal signal, counting and storing the number of times it has been detected, and calculating the score. This function is realized by the microcomputer 18.

FIG. 4 also shows an actual circuit example of the first rectifying means 42, the first integrating means 43, the second integrating means 44, the first comparator 45, and the non-coincidence detecting means 50. The first rectifying means 42 and the second rectifying circuit 46, the first integrating means 43 and the third
Since the same circuit is often used for the integrating means 47, the second integrating means 44, and the fourth integrating means 48, the first rectifying means 42, the first integrating circuit means 4
3. Second integration means 44, first comparator 4
5. The circuit of the non-coincidence detecting means 50 will be representatively explained with reference to the operational diagram of FIG.

51 is an operational amplifier, 52 is a comparator, 54
~60 is a resistor, 61-64 is a capacitor, 65
represents an NPN transistor, and 66 represents an exclusive OR gate circuit. Here τ ₁ = C ₆₄ , R ₅₈ > τ ₂ = C ₆₃ ,
Set to _R59 . Reference numeral 67 represents the microphone audio signal level output from the microphone input means 4. 68 is the output waveform of the first rectifying means 42, 69 is the output waveform passing through the second integrating means 44, and 70 is the waveform passing through the first integrating means 43. Since τ ₁ >τ ₂ , the output waveform 7
The time delay for 0 is large. 71 is an output waveform of the comparator 52, and an H output is obtained in the shaded area between the output waveform 69 and the output waveform 70. 72 represents the vocal signal level output from the first magnetic tape reproducing means 2. 73 is an output waveform passing through the fourth integrating means 48, 74 is an output waveform passing through the third integrating means 47, and 75 is an output waveform from the comparator 49. The hatched portion between the output waveform 69 and the output waveform 70 is H. get the output of 76 shows the output waveform of the exclusive OR gate circuit.

When the audio signal 67 is input from the microphone input means 4,
It is smoothed by the rectifying means 42 and becomes an output waveform 68. The output is passed through integration circuits 43 and 44 with different self-constants.
When input to , output waveform 69 and output waveform 70 are obtained. When the output waveform 69 and the output waveform 70 are respectively input to the comparator 52, the voltage at the non-inverting input terminal of the comparator 52 becomes high in the shaded area and an H output appears in the comparator output, and in the area other than the shaded area, an L output is generated. appears, and the comparator output becomes a waveform 71. The signal from the first magnetic tape reproducing means 2 is also processed in the same manner as described above, and the output waveform of the comparator 49 is the waveform 75.
get. When the output waveforms 71 and 75 are input to an exclusive OR gate, when the output waveforms 71 and 75 do not match, an H signal is output, and when they match, an L signal is output. A waveform 76 is obtained at the output of the exclusive OR gate 66. When the waveform 76 is input to the transistor 65 via the resistor 66, the signal passing from the microphone input means 4 to the first waveform conversion means 7 is erased during the H period of the waveform 76. In other words, if there is a difference in level change between the audio signal level 67 output from the microphone input means 4 and the vocal signal level 72 output from the first magnetic tape reproduction means 2, the waveform from the microphone input means The signal passed through the conversion means 7 is erased. In the case of FIG. 5, the waveform-converted microphone input signal corresponding to the shaded portion of the microphone audio signal level 67 is erased. To be more specific,
If there is a difference in level change between the user's singing voice signal and the vocal signal recorded on magnetic tape, it means that there is a difference in the strength, rhythm, and tempo of the song. An attempt was made to forcibly erase the microphone input signal when this occurred.

FIG. 6 shows an actual circuit example of the first waveform converting means 7. Normally, the same circuit is often used for the first waveform converting means 7 and the second waveform converting means. The circuit of the first waveform converting means 7 will be representatively explained with reference to the operation diagram shown in FIG. 7
01 is the input terminal, 702, 704, 705, 70
8,710,711 are resistors, 703,706,
709 is a capacitor, 707 is an operational amplifier (hereinafter referred to as
(abbreviated as OP amplifier), 712 is a transistor,
713 is an output terminal.

OP amplifier 707 and resistors 702, 704, 7
05 and capacitors 703 and 706 constitute a low-pass active filter, which removes the high-frequency components of the audio electrical signal as shown in Figure 7a input to the input terminal 701, and at the same time inputs the OP amplifier. Necessary signal amplification is performed by the amplifying action of 707, and furthermore, a time constant circuit composed of resistor 708 and capacitor 709 supplementally removes high-frequency components that are not sufficiently removed by the active filter. In this way, the audio electrical signal shown in FIG.
12, the pulse waveform is converted into a pulse waveform as shown in FIG. 7c. In this way, the first waveform converting means 7 converts the user's singing voice signal, which is the output of the microphone input means 4, into a pulse waveform, and the second waveform converting means 8 similarly converts the voice signal sung by the user into a pulse waveform. The vocal signal that is the output of is also converted into a pulse waveform.

The operation of this embodiment will be explained below based on the flowchart shown in FIG. 8 showing the main part of the processing operation of the microcomputer.

First, it is assumed that the power of the device is turned on and that the memory elements and the like inside the microcomputer 18 have also been initialized. The user's singing voice signal becomes an electric voice signal by the microphone input means 4,
The pulse signal is amplified and converted into a pulse signal by the first waveform converting means 7, which is input to the microcomputer 18. In step 20, the time width of the input pulse is converted into a digital quantity. That is, by counting the "H" period of the pulse signal shown in FIG. 7c using the microcomputer's own clock signal, the time width of the input pulse can be converted into a digital quantity. In this way, the time width from t ₁ to t ₂ , the time width from t ₃ to t ₄ , and the time width from t ₅ to t 2 in FIG.
Conversion is performed in the order of time width t ₆ ... still,
If this time width increases, it indicates that the scale has become lower, and if it decreases, it indicates that the scale has become higher.

Next, in step 21, it is determined whether the time width of the pulse signal has increased compared to the previous time width.

That is, in the pulse signal waveform of Fig. 7c, the current
If this is the time when the time width from t ₃ to t ₄ is detected, the time width from t ₃ to t ₄ has increased compared to the time width from t ₁ to t ₂ , which is the data of the previous time width. If the time width has increased, _N11 , which indicates the number of times the scale of the user's audio signal has become lower, is increased by 1 in step 23, and if the time width has not increased, the process proceeds to step 22. and proceed. In step 22, it is determined whether the time width of the pulse signal has decreased compared to the previous time width, and if the time width has decreased, in step 25 N is determined, which indicates the number of times the scale of the user's audio signal has increased. ₁₃ is increased by 1, and if the time width has not decreased, proceed to step 24, and N _12, which indicates the number of times the scale of the user's audio signal does not change, is increased by 1.
Increase by 1.

As mentioned above, steps 20, 21, and 22 realize the function of the first scale change detection means 9, and steps 23,
24 and 25 realize the function of the first count storage means 11.

On the other hand, a vocal signal recorded on a magnetic tape 1, which is an audio multiplexing recording medium, is reproduced by a first magnetic tape reproduction means 2, converted into a pulse signal by a second waveform conversion means 8, and then sent to a microcomputer 18. In step 26, it is determined whether or not the vocal signal is in a rest state by looking at the pulse signal obtained from the vocal signal.

If the vocal signal is in a pause state, proceed to step 27 and determine whether the vocal signal has started to pause, that is, there was a vocal signal until just before, and now there is no signal for the first time, and if the vocal signal has started to pause. In step 28, _N3 , which indicates the number of pauses in the vocal signal, is incremented by one. That is, steps 26 and 27 realize the function of the second pause detection means 14, and step 28 realizes the function of the third count storage means 41.

Conversely, if it is determined in step 26 that the vocal signal is not in a rest state, the vocal signal is released from the rest state in step 29, that is, the vocal signal was in a no-signal state until just before, and is now in a signal state for the first time. Determine whether or not you have become used to it.

Step 30 if the vocal signal is unpaused
Therefore, the process proceeds to step 31 only when the user's singing voice signal input from the microphone is released from the pause almost at the same time. step
In step 31, N ₄ , which indicates the number of times the pause in the voice signal sung by the user is released almost simultaneously with the release of the pause in the vocal signal, is increased by 1. That is, step 30 realizes the function of the first pause detection means 13, steps 26, 29, and 30 realize the function of the pause simultaneous release detection means 15, and step 31 realizes the function of the fourth count storage means 16.

Next, after converting the time width of the input pulse into a digital quantity in step 32, it is determined in step 33 whether or not the time width has increased compared to the previous time width, and if the time width has increased, the step 35, _N21 indicating the number of times the scale of the vocal signal has become lower is increased by 1, and if the time width has not increased, the process proceeds to step 34. In step 34, it is determined whether the time width of the pulse signal has decreased compared to the previous time width, and if the time width has decreased, step 37 indicates the number of times the scale of the vocal signal has increased.
_N23 is increased by 1, and if the time width has not decreased, the process proceeds to step 36, where _N22 , which indicates the number of times the scale of the vocal signal does not change, is increased by 1.

As mentioned above, steps 32, 33, and 34 realize the function of the second scale change detection means 10, and steps 35,
36 and 37 realize the function of the second count storage means 12.

Next, in step 38, it is determined whether it is time to start scoring. The decision to start scoring may be based on push button switch information that designates the start of scoring, or by detecting the presence or absence of performance music signals recorded on the magnetic tape 1. Scoring may start when the music signal disappears. It is also possible to record an end signal indicating the end of the song in advance, and use the point in time when the end signal is detected or the point in time when the end of the magnetic tape is detected.

If it is not yet time to start grading, proceed to step 38.
Then proceed to step 20 or step 26,
N ₁₁ which is the change data of the time width of the pulse signal,
Data collection of N ₁₂ , N ₁₃ , N ₂₁ , N ₂₂ , N ₂₃ , the number of pauses in the vocal signal N ₃ , and the number of times N ₄ the voice signal sung by the user also came out of the pause at almost the same time as the pause in the vocal signal was released. will be carried out.

Then, when it comes time to start scoring, the process proceeds from step 38 to step 39, where the score is calculated. The step 39 has the function of the score calculation means 17, and the score is calculated based on time width change data N ₁₁ , N ₁₂ , N ₁₃ ,
N ₂₁ , N ₂₂ , N ₂₃ , the number of pauses in the vocal signal N ₃ , and the number of times N ₄ that the voice signal sung by the user also comes out of the pause at almost the same time as the moment when the pause in the vocal signal is cancelled. Calculate to give a perfect score of 100. First, a basic formula will be explained as an example of a formula for calculating the score. With α, β, and γ as constants,
The score P is P=100×{(N21+N ₂₂ +N ₂₃ )−(α|N ₁₁ −N ₂₁ |+β|N ₁₂ −N ₂₂ |+γ|N ₁₃ −N ₂₃
|)} /(N ₂₁ +N ₂₂ +N ₂₃ ) ...Define it as an expression.

The score according to the above formula is N ₁₁ = N ₂₁ ,
Full marks are given when N ₁₂ = N ₂₂ and N ₁₃ = N ₂₃ .
The score is 100 points, and this is for all three items: the number of changes in the scale of the user's singing audio signal and the number of changes in the scale of the vocal signal on the magnetic tape: high change, low change, and unchanged. If the number of times is the same, that is, if the change in the scale of the voice signal sung by the user is the same as the change in the scale of the vocal signal on the magnetic tape 1, a full score will be given.

On the other hand, in the above formula, N ₁₁ = 0, N ₁₂ =
The constants α, β, and γ are determined so that the score is 0 when N ₁₃ =0. This is to ensure that the score becomes 0 when the user does not sing at all.

Next, an example of the score calculation formula in this embodiment will be explained. As in the calculation formula above, α, β, and γ are constants, and K ₁ and K ₂ are also constants,
The score P is P=K ₁ × {(N ₂₁ +N ₂₂ +N ₂₃ )−(α|N ₁₁ −N ₂₁ | +β|N ₁₂ −N ₂₂ |+γ|N ₁₃ −N ₂₃ |)} /(N ₂₁ +N ₂₂ +N ₂₃ ) +K ₂ ×N ₄ /N ₃ ... Define as the formula.

The first term in the above equation is the number 100 in the above equation replaced with the constant K ₁ , so
Explanation will be omitted. The second term of the equation, K ₂ ×N ₄ /
To explain the meaning of N ₃ , N ₃ is the number of times the vocal signal pauses, and N ₄ is the number of times the vocal signal pauses and the voice signal sung by the user cancels the pause at approximately the same time. Shows the number of times it has worn out.

To be more specific, _N3 is the number of times the singer in the vocal signal, which is used as a model for scoring, takes a breather or does not sing, and _N4 is the number of times the singer in the vocal signal takes a breather or does not sing. It shows the number of times the user started singing from a state of not singing at almost the same time when the user started singing from a state of not singing, and N ₄
Since there is a relationship of ≦N ₃ , N ₄ /N ₃ is a positive number less than 1, and N ₄ /N ₃ means that the vocal signal and the user's sung audio signal start at almost the same time. It shows the ratio, and can be thought of as an element that shows the sense of rhythm and tempo matching of singing ability. this
The _constants α _{, β} ,
By setting γ, K ₁ , and K ₂ , it is possible to calculate a score more accurately than the calculation formula described above, since it takes into account the sense of rhythm and how the tempo matches.

Let us now consider the case where there is a difference in level change between the user's singing voice signal level 67 and the vocal signal level 72 recorded on a magnetic tape or the like, as shown in FIG. Since the waveform-converted microphone input signal corresponding to the shaded portion of the voice signal level 67 sung by the user is deleted, N ₄ is subtracted, and N ₁₁ , N ₁₂ , and N ₁₃ are subtracted.
Therefore, in the formula, as N ₄ /N ₃ becomes smaller, (α|N ₁₁ −N ₁₂ |+β|N ₁₂ −N ₂₂ |+γ
|N ₁₃ −N ₂₃ |) increases.

Therefore, the score P of the equation will be reduced. This shows that if the user's song does not match the vocal signal recorded on magnetic tape, etc. in terms of strength, tempo, and rhythm, more points will be deducted, which allows for more accurate score calculation. It turns out.

In this way, in step 39, the information on the change in the scale of the user's audio signal, the information on the change in the scale of the vocal signal on the magnetic tape 1, and the information indicating the sense of rhythm and tempo matching of the user's audio signal are used.
It can be seen that the score is calculated based on the extent to which the user's voice signal and the vocal signal on the magnetic tape 1 match. After calculating the score, step 40
The score is displayed on the score display means 14.

As described above, according to this embodiment, changes in the scale of an audio signal sung by a user are compared with changes in the scale of a vocal signal such as a magnetic tape, and the sense of rhythm and tempo are determined based on the vocal signal. Since the degree of matching can be calculated and displayed as a score, it is possible to provide an objective evaluation means for the user's singing ability.

In this example, the user's singing voice signal was used as the scoring target, and the vocal signal recorded on magnetic tape, which is an audio multiplexing recording medium, was used as the scoring standard. An audio signal such as a wave signal or a person's voice may also be used.

Furthermore, in this embodiment, a waveform conversion means using a low-pass active filter and a transistor was used to convert an audio signal into a pulse signal.
This may be accomplished by using a circuit that directly converts the audio signal waveform into a digital pulse signal using an analog-to-digital converter.

Further, in this embodiment, the scale change detection means, count storage means, etc. are realized by a microcomputer, but it goes without saying that these may be realized and used by conventional general-purpose logic circuits.

Furthermore, in this embodiment, waveform converting means and scale change detecting means are provided separately for processing the user's audio signal and vocal signal processing, but these are provided in only one system, and the user's audio signal is processed in a time-sharing manner. , and vocal signal processing may be performed.

In addition, in this embodiment, the time width in the case of "H" of the pulse signal which is the output of the _waveform converting means _is shown in _{FIG .} It detects everything such as width, changes in the higher direction of the audio signal scale, changes in the lower direction, and 3 that remain unchanged.
We are trying to detect changes in species, for example,
In Figure 7c, the time span from t ₁ to t ₂ starts from t ₅ .
Changes in the time width may be detected one at a time, such as the time width of _t6 , or the change in time width may be sufficiently long compared to one time width when the pulse signal that is the output of the waveform converting means becomes "H". The time width at which the pulse signal that is the output of the waveform converting means becomes "H" for a certain period of time is investigated for all pulses or for a part of the pulses, and the average time width and maximum time width for each pulse are determined. , changes in the scale of the audio signal may be detected based on changes in the average time width, etc., or changes in the higher direction, lower direction, etc.
Of the three types of unchanging changes, only one or two types of changes may be detected.

Effects of the Invention As described above, the present invention includes two waveform conversion means for converting two audio signals into pulse signals, and detects how the scales of the two audio signals change based on the outputs thereof. two scale change detection means,
two counting storage means for counting and storing the output;
It is stored by two counting storage means. We compare and calculate three types of information: the number of times we detected a transition to a higher scale, the number of times we detected a transition to a lower scale, and the number of times we detected a change.
By checking how the tempos match, it is possible to more accurately obtain a score based on the degree of matching between the two audio signals.

This means that people who practice singing using audio multiplexed recording media can use the vocal signals recorded on the audio multiplexed recording media as a singing teacher to evaluate the singing ability of the singing teacher. This means that it is possible to provide an objective means of determining how many points a person has in terms of singing ability. In other words, for those who practice singing, the goal of practicing becomes clearer, and the motivation to practice increases, such as saying, ``I'm going to sing this song and practice until I get a score of 80 or higher,'' and it becomes easier to try singing. If you don't get good marks, you can think about why you don't get good marks and look for weaknesses in your singing style to further improve your singing ability, which can have a great effect.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of an audio multiplex track on a magnetic tape, which is one type of audio multiplex recording medium, and Figure 2 is an illustration of a so-called audio multiplex track using magnetic tape, which is one type of audio multiplex recording medium. 3 is a block diagram of a main part of an embodiment of the present invention, FIG. 4 is a block diagram showing the specific configuration of this embodiment, and FIG. 5 shows the operation of FIG. 4. FIG. 6 is a circuit diagram showing a specific configuration of the first waveform converting means of this embodiment, and FIG.
FIG. 8 is a flowchart showing the main part of the processing operation of the microcomputer of this embodiment. 7...First waveform conversion means, 8...Second waveform conversion means, 9...First scale change detection means, 10
...Second scale change detection means, 11...First count storage means, 12...Second count storage means, 13
...first pause detection means, 14...second pause detection means, 15...pause simultaneous release detection means, 41...
...Third count storage means, 16...Fourth count storage means, 17...Score calculation means, 42...First rectification means, 43...First integration means, 44...Second
integrating means, 45...first comparator, 46
... second rectifying means, 47 ... third integrating means,
48... Fourth integrating means, 49... Second comparator, 50... Non-coincidence detecting means.

Claims (1)

[Claims] 1. A first waveform converting means that converts an input first audio signal into a pulse signal, and based on the output pulse signal of the first waveform converting means, the scale of the first audio signal is high. a first scale change detection means for detecting whether the scale has shifted to a lower scale, or whether there has been a shift to a lower scale, or no change; and a second waveform conversion means to convert an inputted second audio signal into a pulse signal. , a second device for detecting whether the scale of the second audio signal has shifted to a higher scale, shifted to a lower scale, or remains unchanged based on the output pulse signal of the second waveform conversion means; Based on the outputs of the scale change detection means and the first scale change detection means, the number of times a shift to a higher scale was detected, the number of times a shift to a lower scale was detected, and the number of times no change was detected. and the number of times a shift to a higher scale was detected, and the number of times a shift to a lower scale was detected, based on the outputs of the first count storage means for counting and storing, respectively, and the second scale change detection means. a second count storage means for counting and storing the number of times the number of times and the number of times the number of times it has been detected as unchanged; a first pause detection means for detecting a no-signal portion of the first audio signal; a second pause detection means for detecting a no-signal portion of the pause detection means; a third counting storage means for counting and storing the number of times a pause has been detected by the second pause detection means; and an output of the second pause detection means. pause simultaneous release detection means for detecting whether the pause of the second audio signal is released based on the pause simultaneous release detection means; a fourth count storage means for counting and storing the number of times that the audio signal has been released from a pause, and a count storage means for counting and storing the number of times that the transition to a high pitch has been detected, which is stored by the first count storage means, and a low Three pieces of information: the number of times a shift to a higher scale was detected, the number of times a change was detected as no change, and the number of times a shift to a higher scale was detected, which is stored by the second counting means;
A comparison operation is performed with three pieces of information: the number of times a shift to a lower scale is detected and the number of times a change is detected, and a pause is further detected by the second pause detection means stored in the third count storage means. The number of times the audio signal has been paused and the cancellation of the pause of the first audio signal stored in the fourth count storage means
score calculation means for calculating as a score the degree to which the first audio signal matches the second audio signal according to the ratio of the number of times the audio signal is released from the pause and the number of times the audio signal is released substantially at the same time; , a first rectifying means for rectifying the first audio signal, a first integrating means for integrating the rectified voltage of the first rectifying means, and a time constant different from the time constant of the first integrating means. a second integrating means for integrating the rectified voltage of the first rectifying means;
A first comparator that compares the output voltage of the first integrating means and the output voltage of the second integrating means detects the first audio signal corresponding to the occurrence of the first audio signal. A second rectifying means that extracts the pulse and rectifies the second audio signal, and a third integrating means that integrates the rectified voltage of the second rectifying means, and the time constants of the third integrating means are different. A fourth integrating means that integrates the rectified voltage of the second rectifying means with a time constant, and a second comparator that compares the output voltage of the third integrating means and the output voltage of the fourth integrating means. , every time a second audio signal occurs, a second pulse approximately corresponding to the occurrence is taken out, the first pulse and the second pulse are input to a non-coincidence detection means, and the first pulse and the second pulse are input to the non-coincidence detection means. Second
2. A scoring device characterized in that an output is taken from the non-coincidence detection means during a period when the pulses of the first waveform converting means are different, and the output pulse signal of the first waveform converting means is erased by the output.