JPH0711445B2 - Display for musical sound analysis - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly uses a vibration frequency analysis method to obtain the pitch and strength of a voice sound or musical instrument sound collected from a microphone, or a musical sound of an electronic musical instrument, an audio device or the like.
The present invention relates to a musical sound analysis display device that displays a pitch .

[0002]

2. Description of the Related Art Usually, a sound used in music is called a musical sound, and each musical sound is given a note name according to the pitch of the musical sound. Among them, the sound (PICTH) named "single-tone" is tuned to 440Hz with a piano, organ, accordion, or other musical instrument, and the sound is resonated. , I was measuring music.

[0003]

However, the musical tone is mixed with elements such as the altitude of the tone, the strength and weakness of the tone, the pitch, the time signature, the notes, the rests and the scale. It takes skill to do so, and in particular, it is said that it is extremely difficult to judge the altitude and pitch of a sound unless the person has an auditory absolute pitch.

Therefore, the present invention was created in order to solve the above-mentioned problems, and the altitude of sound, the strength of sound,
Pitch, time signature, notes, rests, to determine the tones mingling of elements of the scale, etc. easily and reliably, analysis and chord on the sum voice studies, very easily as the analysis or the like of the interval indicating the sound state The present invention provides a display device for analyzing various musical sounds .

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention uses the respective note names corresponding to staves.
Of one or more sounds of
A bandpass output signal with a certain vibration frequency is added to each sound.
Ask for it, shake the meter, or
On the screen with the staff or peer
On the screen where the keyboard diagram is drawn, the signal level of each note name is displayed.
How to express the size of the bell such as bar graph, symbol, light and shade
By showing the strength of the sound corresponding to the staff,
How strong and weak the sound of the altitude of
Try to understand how the sounds are combined
Frequency analysis corresponding to the musical staff,
It was designed to visually capture the elements of musical sounds that could not be captured .

[0006]

[Operation] And, by the technical means as described above ,
Altitude, sound intensity, pitch, time signature, notes, rests, scale, etc.
It is possible to easily and surely discriminate between mixed sounds.
It can be so.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, reference numeral 1 is a microphone, reference numeral 2 is an electric amplifier for amplifying the output signal of the microphone 1, and reference numeral 3 is an external input terminal for receiving an output signal from an electronic musical instrument or audio equipment. Yes, the code 4 is
A switch for switching between an output signal from the microphone 1 and an output signal from the external input terminal 3. Also,
Reference numerals 5a to 5n are bandpass filters, and reference numerals 6a to 6n are the bandpass filters 5a to 5n.
It is a meter that indicates the magnitude of the output signal that has passed through each of n.

FIG. 2 shows a staff and shows a part of the note names corresponding to the staff. The code A is a hiragana sound, the code B is a katakana sound, and the code C is a single point sound. Code D
Is a two-tone sound, and the code E is a three-tone sound. Incidentally, the symbol F is the central C sound.

FIG. 3 shows a state in which each note name of the staff of FIG. 2 is applied to a piano keyboard, reference numeral 7 is a white key, and reference numeral 8 is a black key. Further, reference numeral 9 indicates a keyboard position of a note name named "one-note a note". The sound gradually increases as the white keys 7 and the black keys 8 move to the right, and conversely decreases as the white keys 7 and the black keys 8 move to the left. It can be seen that the musical sounds are repeated seven times with a set of seven sounds (ha, ni, ho, he, to, i, ro). Here, the code G is the lower two-point sound (lower two-point octave), the code H is the lower one-point sound (lower one-point octave), the code A is the hiragana sound (hiragana octave), and the code B is the katakana sound (katakana). Octave), code C is a single tone (single octave), code D is a two-tone (two-point octave), code E is a three-tone (three-point octave), code I is a four-tone (four-octave), code J is a five-point sound (five-point octave), and reference sign F is a central C sound. These seven sounds are called stem sounds, and the intervals between the same-named sounds of different pitches are called octaves. This one octave difference is exactly the vibration frequency
When doubled and seven stems are added to the five tones derived from the black key 8, a sequence of 12 semitones is set. The bandpass filters 5a to 5n in FIG.
The octave is divided into 12 pieces, and each piece is assigned to it.

Next, the frequency at which the band-pass filters 5a to 5n are passed will be described. The altitude (PITCH) of the single-point sound 9 is defined as a standard altitude of 440 Hz. Altitude is selected in the range of about 415 to 445 Hz based on the standard altitude of 440 Hz.

Since the playing altitude is H and the frequency doubles in one octave, the natural logarithm of the numerical value "2" is a constant "k", and k = 1n 2 is about 0.69314. Then, when the frequency of the n-th sound centering on the sound of "one point sound" is "Fn", Fn = H exp (nk / 12). In this case, n = ...- 3, -2, -1,0, + 1, + 2, + 3
・ ・ And, plus is the higher side than "one-point sound" and minus is the lower side than "one-point sound".

For example, assuming that H = 440 and one output signal is obtained for one note name, the following is obtained.

One point c n = 3 F = 440
・ Exp (3K / 12) = 523.25 One point n = 2
F = 440 ・ exp (2K / 12) = 493.88 Black key between 1 point b and 1 point n = 1 F = 440 ・ exp (K / 12) = 466.16 1 point a
n = 0 F = 440 ・ exp (0) = 440
Black key between 1 point a and 1 point n = -1 F = 440 ・ exp (-K / 1
2) = 415.30 1 point n = -2 F = 440
・ Exp (-2K / 12) = 392.00 Black key between one point and one point n = -3
F = 440 ・ exp (-3K / 12) = 369.99 1 point
n = -4 F = 440 ・ exp (-4K / 12) = 349.23 1 point e
n = -5 F = 440 ・ exp (-5K / 12) = 329.
63 Black key between 1 point e and 1 point n = -6 F = 440 ・ exp (-6K
/12)=311.13 One point n = -7 F = 440
・ Exp (-7k / 12) = 293.66 Black key between point d and point c n = -8
F = 440 ・ exp (-8K / 12) = 277.18 1 point
n = -9 F = 440 ・ exp (-9k / 12) = 261.63
n = -10 F = 440 ・ exp (-10k / 12) = 246.94
Black key between b and a n = -11 F = 440 ・ exp (-11k / 1
2) = 233.08 b n = -12 F = 440 ・ exp
(-12k / 12) = 220

From the above calculation, it can be seen that the frequency is doubled in one octave. In other words, the sound at any pitch is always 1.0595 times the frequency of the preceding low sound. In addition, since the calculated value is the center value of the vibration frequency of the sound of each pitch name, the bandpass filters 5a to 5n have a plus and minus width to the center value of each vibration frequency. Will have a bandwidth. In this way, by looking at the meter installed at the position corresponding to the staff,
At what height (altitude) the output signal of the input sound is located, or how strong (strength) it is, and how the sounds are combined (pitch)
You can see at a glance what it is.

Further, the present invention is not limited to the above-described embodiment, but the point is that the strength of each sound corresponding to the staff should be obtained. For example, as shown in FIG. 4, the microphone 1, the electric amplifier 2, the external input terminal 3, and the switch 4 are the same as in the above-described embodiment,
The output terminal of the switch 4 may be sequentially connected to the frequency analysis unit 10 and the liquid crystal display 15. The frequency analysis unit 10 includes an analog / digital converter 11, a microprocessor (CPU) 12, a memory (ROM,
RAM) 13, digital signal processor (DS
P) 14 etc. Then, the analog signal taken in from the switch 4 is converted into a digital signal through the analog / digital converter 11, and sequentially stored in the memory 13 as time passes, and the data group is stored in the digital signal processor (DSP) 14
The is to calculate the strength of the frequency of the signal to be calculated Meyo through. The value on the LCD screen of the liquid crystal display device 15 which staves is he drawing, or the liquid crystal screen of the liquid crystal display device 15 which piano keyboard diagram is he drawing, using bar graphs, symbols, how to represent brightness or the like, The strength of the sound corresponding to the staff may be indicated.

[0017]

INDUSTRIAL APPLICABILITY The present invention is directed to each sound corresponding to a staff.
For one or more of the sound of the name, with the sound of their respective
A bandpass output signal with a unique vibration frequency
Or shake the meters 6a to 6n,
Or instead of the meters 6a to 6n, draw a staff.
On the open screen or on the screen with a piano keyboard drawing
The signal level of each note name
Corresponding to staves using expression methods such as f
By showing the strength of the sound, how much sound at which altitude
And how the sounds are combined.
You can see if the
Music that was captured only auditorily by performing frequency analysis
Since it is possible to visually capture the elements of, it is possible to easily and surely discriminate musical tones that include elements such as the altitude of the sound, the strength of the sound, the pitch, the time signature, the notes, the rests, and the scale.
Therefore, it is possible to extremely easily perform analysis of chords in harmony, and analysis of pitch indicating a reverberation state. Furthermore, if you store the signals sequentially over time,
It is also possible to reproduce it later, so that time signatures, notes, rests, scales, etc. can also be analyzed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a musical sound analysis display device of the present invention.

FIG. 2 is a staff showing a part of a note name.

FIG. 3 is a plan view showing a state in which each note name of the staff of FIG. 2 is applied to a piano keyboard of a musical instrument.

FIG. 4 is a block diagram showing another embodiment of the musical sound analysis display device of the present invention.

[Explanation of symbols]

 1 Microphone 2 Electric Amplifier 3 External Input Terminal 4 Switch 5a-5n Bandpass Filter 6a-6n Meter 7 White Key 8 Black Key 9 Single Point Sound 10 Frequency Analysis Section 11 Analog / Digital Converter 12 Microprocessor 13 Memory 14 Digital Signal Processor 15 Liquid crystal display A Hiragana sound, B Katakana sound C One-tone sound D Two-tone sound E Three-tone sound F Middle C-tone G Lower two-tone sound H Lower one-tone sound I Four-tone sound J Five-tone sound

Claims (1)

[Claims] Claim: 1. One or each note name corresponding to a staff
Is the unique vibration of each sound
Find the frequency bandpass output signal for each sound
Then shake the meter, or replace this meter
Instead, on the screen where the staff is drawn, or the piano keyboard diagram
On the screen where is drawn, the signal level of each note name is
Use a representation method such as bar graph, symbol, light and shade,
By showing the strength of the sound corresponding to the staff, which altitude
How strong and weak the sound is, and how
To see if the sound is combined with
The frequency analysis corresponding to the staff is performed, and it can be captured only by the auditory sense.
I made it possible to visually capture the elements of the music that could not be played
A display device for musical sound analysis characterized by the above .