JPH07110680A - Tuning device - Google Patents

Abstract

PURPOSE:To display a correct string number based upon an open string even when the string is tuned by harmonics execution successively to tuning by strumming the open string. CONSTITUTION:The tuning device which detects the pitch of an input signal based upon the vibration of the string and displays the string number corresponding to the detected pitch is equipped with a detecting means which continuously detects the pitch of the input signal based upon the vibration of the string, a display means which displays the string number previously set corresponding to the pitch detected by the detecting means, a comparing means which compares the pitch of the 1st input signal continuously detected by the detecting means with the pitch of the 2nd input signal detected by the detecting means within a specific interval previously set from the final pitch detection of the 1st input signal, and a display control means which displays the string number, previously set corresponding to the 1st pitch, on the display means when the comparison result of the comparing means indicates that the pitch of the 2nd input signal is (n) times as large as the pitch of the 1st input signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tuning device, and more particularly, to a pitch of a fundamental tone (hereinafter, simply referred to as "pitch of input signal") excluding harmonic components of an input signal based on vibration of a string of a stringed instrument to be tuned. It is referred to as "."). It relates to a tuning device capable of displaying the string number of a string of a stringed instrument according to the pitch.

[0002]

2. Description of the Related Art At present, as a tuning device for a stringed instrument, a pitch of an input signal based on vibration of a string due to a string's striking string is detected, and a string preset according to the detected pitch is detected. A tuning device that displays numbers has been proposed.

Generally, in the tuning device as described above,
A predetermined pitch range is set around the reference pitch of the open string of each string (for example, in normal tuning of a guitar, the reference pitch of the open string of the fifth string is 110 Hz), and the pitch of the input signal is set. It is detected which of the strings belongs to the pitch setting range centered on the reference pitch of the open string, and the string number of the string corresponding to the reference pitch of the pitch setting range to which the pitch of the input signal belongs is displayed.

Therefore, the tuner can easily tune while checking the displayed string number by playing the open string.

In the case of a stringed instrument, a method is known in which, in addition to a method of playing an open string of a string for tuning, a harmonic sound is generated by a harmonics playing method to perform tuning.

In other words, if the method of playing an open string when tuning a stringed instrument is used, the pitch of the input signal will rise slightly when the string is played, so the rough tuning is terminated and the final tuning is performed. When performing a delicate tuning, tuning using a harmonics playing method in which a pitch rise due to a string is small was often performed.

However, in the conventional tuning device, since the string number is displayed with the reference pitch of the open string as a reference, the conventional tuning device is used to continue the tuning by the string string as described above. However, there was a problem that the correct string number could not be displayed when tuning with harmonics.

This problem will be described below with reference to FIG. 8 by taking a guitar as an example. As described above, the standard pitch of the open string of the fifth string in normal tuning is 1
It is 10 Hz. Therefore, play the open string of the 5th string of the guitar to be tuned, and the pitch at that time is 1
If the frequency is 10 Hz, the pitch of the string and the reference pitch match, so the tuning device recognizes that a pitch that matches the reference pitch of the fifth string has been input, and the tuning unit displays “No. The string number "5 strings" will be displayed. However, at this time, the
When you play the 12th fret harmonics, the pitch is 220Hz, which is double the open string. Therefore, the pitch due to the harmonics of the 12th fret of the fifth string is not recognized as the pitch corresponding to the fifth string, but is recognized as the pitch located between the third string and the second string. Become. Therefore, the indication "fifth string" is not displayed on the display unit of the tuning device.

As described above, the conventional tuning device has a problem in that the correct string number cannot be displayed if the tuning by the harmonic performance method is performed after the tuning by the open string.

The present invention has been made in view of the above-mentioned problems of the conventional tuning device, and an object of the present invention is to perform tuning by a harmonics performance method after tuning by an open string. It is an object of the present invention to provide a tuning device capable of displaying the correct string number based on the open string even when the tuning is performed.

[0011]

In order to achieve the above object, a tuning device according to the present invention detects the pitch of an input signal based on the vibration of a string of a stringed instrument and displays the string number according to the detected pitch. In the tuning device, detection means for continuously detecting the pitch of an input signal based on the vibration of the strings of a stringed instrument, and display means for displaying a preset string number corresponding to the pitch detected by the detection means, The pitch of the first input signal continuously detected by the detection means, and the second detected by the detection means within a predetermined interval preset from the time of the final detection of the pitch of the first input signal. The comparison means for comparing the pitch of the input signal and the comparison result by the comparison means show that the pitch of the second input signal is n (n is a positive integer) times the pitch of the first input signal. When , In which the string number set in advance in correspondence with the first pitch and to have a display control means for displaying on the display means.

[0012]

The second pitch detected by the detecting means within a predetermined interval from the time of the final detection of the pitch of the first input signal continuously detected by the detecting means is n by the comparing means. If it is doubled,
The display control means controls the display means such that the preset string number corresponding to the first pitch is displayed on the display means.

For example, taking the pitch of the fifth string in the normal tuning of the guitar described above with reference to FIG. 8 as an example, the second string detected by the comparison means within a predetermined interval set in advance. If the pitch (pitch by 12 fret harmonics: 220 Hz) is n times (twice) the first pitch (pitch by open string plucking: 110 Hz), the second pitch (220 Hz) ) Is the harmonic sound of the open string with the string number at the first pitch (110 Hz), and the second pitch is input, but the first pitch is displayed on the display means by the control of the display control means. Corresponding string number (5th
String) is displayed.

[0014]

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

FIG. 1 is a block diagram showing an embodiment of a tuning device according to the present invention. The tuning device controls the whole operation thereof by using a central processing unit (CPU) 10. It is configured.

The CPU 10 has a read-only memory (ROM) 14 in which a predetermined program for controlling the overall operation is stored via the bus 12 and various registers necessary for executing the program. Access as a working area including
A memory (RAM) 16, an operator section 18 described later, a display section 20 described later, an input section 22 for inputting a signal due to vibration of a string of a stringed instrument, and a signal input to the input section 22 (input signal ) Waveform shaping circuit 2 for shaping the waveform
4 and 4 are connected. It is assumed that the CPU 10 is set with a counter having a count of 1 μsec.

The operator unit 18 is arranged on the display panel 30 of the tuning device shown in FIG. 2, and has a power switch 32 for controlling ON / OFF of the tuning device as a whole.
Is set. In FIG. 2, the power switch 32
Is turned on.

The display section 20 is arranged on the display panel 30 of the tuning device shown in FIG. 2, and the string number display section 40 for displaying the string number and the reference pitch of the open string as shown in FIG. Deviation display section 42 that displays the deviation from the pitch of the input signal
And are provided. In FIG. 2, the string number display section 4
The string number "6" of the sixth string is displayed at 0, and the deviation display section 42 displays the state where the deviation from the reference pitch is "0".

The waveform shaping circuit 24 is a known circuit and generally includes a filter circuit, an amplification circuit, and a comparison circuit.

The operation of the tuning device having the above arrangement will be described step by step with reference to the flow charts of FIGS.

When the power switch 32 is turned on and the power is turned on, the main routine in FIG. 3 is started,
First, in step S302, initial setting processing is performed. In this initialization process, the main
Various buffers, registers, parameters, etc. used in the routine are initialized and set to predetermined initial values.

Further, in this step S302,
The harmonics flag will be set to OFF. The harmonics flag indicates that the harmonics flag is on (ON) and the input signal is determined to be based on the harmonics rendition method in the harmonics determination process described later. The harmonics flag is off, and the input signal is the harmonics rendition method. It is determined that it is not due to.

When the process of step S302 is completed, the process proceeds to step S304. In step S304,
Pitch detection processing is performed. That is, processing is performed by detecting the pitch of the input signal from the input signal based on the string vibration of the string instrument or the vibration of the string by the harmonics playing method input from the input unit 22. Since this pitch detection processing is a known technique, a detailed description thereof will be omitted. First, the input signal input to the input unit 22 is waveform-shaped by the waveform shaping circuit 24 into a rectangular wave. The rectangular wave after the waveform shaping is counted by the counter of the CPU 10 for how many microseconds one cycle time is between the rising edges or the falling edges of the rectangular wave. Since the count of the counter of the CPU 10 is 1 μsec, the pitch is obtained from the counted data of one cycle time. When the process of step S304 ends, step S306
Go to.

In step S306, harmonics determination processing is performed. In this harmonics determination process, it is determined whether the pitch of the input signal obtained in step S304 is based on the harmonic performance style. The sub routine of this harmonics determination process will be described later in detail with reference to FIG.

When the process of step S306 is completed, the process proceeds to the string number acquisition process of step S308. In the string number acquisition process, the string number is searched based on the pitch of the input signal obtained in step S304 and the determination result of the harmonics determination process in step S306, and the string number to be displayed is acquired. The sub routine of this string number acquisition processing will be described later in detail with reference to FIG. When the process of step S308 ends, the process proceeds to step S310.

In step S310, display processing is performed. In this display processing, the string number acquired in step S308 is displayed on the string number display unit 40 of the display unit 20. Further, when the pitch of the input signal is between “−50 cent” and “+50 cent” from the reference pitch of the open string of the string number displayed in the string number display section 40, it is determined based on a known technique. The deviation from the pitch is displayed by driving the pointer of the deviation display section 42. When the process of step S310 ends, this main routine ends.

Next, the harmonics determination process will be described in detail with reference to the flowchart of FIG. In this harmonics determination process, step S
From the pitch of the input signal obtained by the pitch detection processing of 304, it is determined whether or not the pitch of the input signal is obtained by the harmonic performance style.

First, in step S402, it is determined whether or not the harmonics flag is on. The harmonics flag is initialized to OFF in step S302 as described above.

If the determination result in step S402 is negative (N), that is, if the harmonics flag is off, the process proceeds to step S404.

In step S404, the "interruption interval" from the "previous pitch detection" is obtained. Here, "previous pitch detection" means that in the pitch detection processing in step S304, before the current pitch detection processing (current pitch detection) in which the pitch was properly detected, the pitch is properly detected without error processing. Among the completed pitch detection processing, this is the pitch detection processing immediately before the current pitch detection. Further, the “interruption interval” is the time interval from the previous pitch detection to the current pitch detection in this embodiment.

When the processing of step S404 is completed, the process proceeds to step S406, and it is determined whether the interruption interval is within the "allowable interval". Here, the "allowable interval" is set to "500 msec" in this embodiment.

If the determination result of step S406 is affirmative (Y), that is, if the gap interval is within the allowable interval, the process proceeds to step S408, and the pitch detected by the current pitch (current pitch) is the pitch detected by the previous pitch (previous time). (± 50ce)
It is determined whether it is within the range of “nt”.

The determination result of step S408 is affirmative, that is, the current pitch is ± 50 with the double of the previous pitch as the center.
If it is within the range of “cent”, the process proceeds to step S410.

In step S410, the harmonics flag is turned on to indicate that it is determined that the pitch is based on the harmonics rendition style this time, and this harmonics determination process is terminated and the process returns to the main routine.

On the other hand, if the result of the determination in step S408 is negative, that is, if the current pitch is not within the range of ± 50 cents centered on twice the previous pitch, the harmonics determination processing is terminated and the main routine is returned to. To return. Therefore, in this case, the "harmonics flag: OFF" at the time of the process of step S402 is maintained as it is, which indicates that it is determined that the pitch is not based on the harmonic performance style.

Even when the result of the determination in step S406 is negative, that is, when the discontinuity interval exceeds the permissible interval, the harmonics determination process is terminated in the same manner as described above, and the process returns to the main routine. Therefore, also in this case, step S4
"Harmonics flag: OFF" when processing 02
Will be maintained as it is, indicating that this time it is determined that the pitch is not due to the harmonic performance technique.

If the determination result of step S402 is affirmative, that is, if the harmonics flag is on, the process proceeds to step S412, and the current pitch is within the range of "± 50 cents" of the "previous harmonic pitch". Determine if there is. Here, the "previous harmonic pitch" is the pitch that has been subjected to the pitch detection processing immediately before the current pitch, among the pitches of the input signals whose string numbers have been displayed when the harmonics flag is on. .

The determination result of step S412 is affirmative, that is, the current pitch is ± 50c of the previous harmonic pitch.
If it is within the range of ent, the harmonics determination process is terminated and the process returns to the main routine.
Therefore, in this case, the "harmonics flag: ON" at the time of the processing of step S402 is maintained as it is, and it is shown that the current pitch is also determined to be the harmonic performance style following the previous pitch. .

On the other hand, the determination result of step S412 is negative, that is, the current pitch is ± the pitch of the previous harmonics.
If it is not within the range of 50 cents, step S41.
Go to 4.

In step S414, the harmonics flag is turned off to indicate that it is determined that the pitch is not based on the harmonics rendition method this time, and the harmonics determination process is terminated and the process returns to the main routine.

Next, the string number acquisition processing will be described in detail with reference to the flowchart shown in FIG. In this string number acquisition process, the string number is acquired from the pitch of the input signal obtained in the pitch detection routine in step S304 and the ON / OFF setting state of the harmonics flag set in the harmonics determination process in step S306. The acquired string number is displayed in the display process of step S310.

First, in step 502, it is determined whether the harmonics flag is on.

If the determination result in step S502 is negative, that is, if the harmonics flag is off (when it is determined that the harmonics rendition is not performed), the process proceeds to step S504, and the string is started from the current pitch based on a known technique. Get the number and return to the main routine. That is, the string number of the string corresponding to the reference pitch in the predetermined pitch setting range to which the current pitch belongs is acquired as the string number of the current pitch.

On the other hand, if the determination result in step S502 is affirmative, that is, if the harmonics flag is on (when it is determined that the harmonics rendition is performed), the process proceeds to step S506, and the string acquired based on the previous pitch is used. The number (previous string number) is inherited as the string number of the current pitch, the string number acquisition process is terminated, and the process returns to the main routine.

Therefore, if it is determined that the harmonic performance is performed for the current pitch, the previous string number will be inherited as the string number to be acquired. Also, the display of the previous string number will be continuously displayed.

Next, referring to the operation explanatory diagram of FIG.
Using the tuning device according to the above embodiment, the fifth guitar
A method of tuning a string will be described. In the tuning device according to the above embodiment, it is assumed that the reference pitch is set for each string number as shown in FIG.

As shown in FIG. 6, immediately after the power switch 32 is turned on to turn on the power (harmonics flag:
Off), first play the open string of the fifth string, and then step S30
110H by 4 pitch detection processing (previous pitch detection)
It is assumed that z is detected, and then the fifth string, 12th fret harmonics is played, and then step S30.
220H by 4 pitch detection processing (current pitch detection)
It is assumed that z is detected. Further, it is assumed that the interruption interval between the previous pitch detection and the current pitch detection was 300 msec.

In the harmonics determination process of step S306 in the above case, since the harmonics flag is off, the determination result of step S402 is negative and the process proceeds to step S404, where the interruption interval is 30.
Get 0 msec.

The interruption interval of 300 msec is within the allowable range (5
Since it is within 00 msec), the determination result of step S406 becomes affirmative, and the process proceeds to step S408.

Since the current pitch is twice the previous pitch, the determination result of step S408 becomes affirmative and the process proceeds to step S410, and the harmonics flag is set to ON in step S410.

When the harmonics flag is set to ON in this way, in the string number acquisition process of step S308, the determination result of step S502 becomes affirmative, and the previous string number is inherited in step S506.

Here, as the previous string number when the open string of the fifth string is struck, "5th string" corresponding to 110 Hz
Since the "string" has been acquired, step S50
Also in 6, the “fifth string” is acquired as the string number. Therefore, even if the 12th fret harmonic of the fifth string is played subsequently to the open string of the fifth string, the string number acquired by the open string of the open string is continuously acquired and displayed in the string number display portion 40. The "fifth string" will be displayed.

FIG. 7 shows another embodiment of the string number acquisition processing. In this embodiment, the harmonics
Processing for determining whether the flag is on (step S
502), and the result of the determination in step S502 is negative, the process of acquiring the string number from the current pitch (step S).
Since 504) is the same as the string number acquisition processing shown in FIG. 5, the detailed description will be omitted by giving the same step numbers as those in FIG.

In the string number acquisition process shown in FIG. 7, if the determination result of step S502 is affirmative, the process proceeds to step S706.

In step S706, the current pitch is standardized to the reference pitch (open string pitch) of the open string of the previous string number. That is, the current pitch is multiplied by n with the time period data (n is a positive integer) and standardized to the open string pitch. 1
The string number acquired by the harmonics of the 2nd fret,
When matching with the string number obtained by the input pitch of the open string, “n = 2”.

When the process of step S706 is completed, the process proceeds to step S504, and the string number is obtained from the standardized current pitch.

Therefore, also in this second embodiment, when the fifth string of 12th fret harmonics is played subsequently to the open string of the fifth string, the string number obtained by the open string is It is continuously acquired and the "fifth string" is displayed on the string number display portion 40.

In the above-mentioned embodiment, 500 msec is set as the allowable interval of the interruption, but
The value is not limited to 00 msec, and a longer value or a shorter value may be set as appropriate.

Further, in the above embodiment, the time from the previous pitch detection to the current pitch detection is set as the allowable interval of the interruption interval, but the time interval from the previous pitch detection to the current pitch detection is not limited to this. The number of error processing cycles in the broken pitch detection processing may be used.

Further, the allowable interval of the interruption interval may be set in consideration of the time and the number of cycles.

Furthermore, in the above embodiment, "double pitch (± 50 cent)" of the reference pitch of the open string is used.
Was decided as the pitch by the harmonics playing method, but "2
The determination may be made based on a multiple other than “double”, for example, 3 times, 4 times, ..., N times (n is a positive integer).

Although the range of "± 50 cents" is set when the pitch of the harmonic performance is determined (steps S408 and S412), the range is not limited to this, and an appropriate range may be set. It is not necessary to set such a range.

[0063]

Since the present invention is constructed as described above, it has the following effects.

In a tuning device that detects the pitch of an input signal based on the vibration of a string of a stringed instrument and displays the string number according to the detected pitch, the pitch of the input signal based on the vibration of the string of the stringed instrument is continuously detected. A detection means; a display means for displaying a preset string number corresponding to the pitch detected by the detection means; a pitch of a first input signal continuously detected by the detection means; and a first input Comparison means for comparing the pitch of the second input signal detected by the detection means within a predetermined interval set in advance from the time of the final detection of the pitch of the signal, and the comparison result by the comparison means, Display control means for displaying on the display means a preset string number corresponding to the first pitch when the pitch is n (n is a positive integer) times the pitch of the first input signal. To have Therefore, the second pitch detected by the detection means within the predetermined interval set in advance from the time of the final detection of the pitch of the first input signal continuously detected by the detection means is multiplied by n times by the comparison means. If it is determined that the string number is preset, the display control means controls so that the preset string number corresponding to the first pitch is displayed on the display means.

Therefore, according to the tuning device of the present invention, the correct string number based on the open string can be displayed even when the tuning by the harmonic performance technique is performed subsequent to the tuning by the open string. become.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a tuning device according to the present invention.

FIG. 2 is an explanatory diagram showing an example of a display panel of the tuning device.

FIG. 3 is a flowchart of a main routine.

FIG. 4 is a flowchart of a harmonics determination process.

FIG. 5 is a flowchart of a string number acquisition process.

FIG. 6 is an operation explanatory view showing an example of a tuning method using the tuning device according to the present invention.

FIG. 7 is a flowchart of a string number acquisition process according to another embodiment.

FIG. 8 is an explanatory diagram showing acquisition of a string number by a harmonics performance method in a conventional tuning device.

[Explanation of symbols]

 10 CPU 12 Bus 14 ROM 16 RAM 18 Operator part 20 Display part 22 Input part 24 Waveform shaping circuit 30 Display panel 32 Power switch 40 String number display part 42 Deviation display part

Claims (1)

[Claims] 1. A tuning device for detecting a pitch of an input signal based on the vibration of a string of a stringed instrument and displaying a string number according to the detected pitch, wherein the pitch of the input signal based on the vibration of the string of the stringed instrument is continuously measured. Detecting means for detecting, display means for displaying a preset string number corresponding to the pitch detected by the detecting means, and a pitch of the first input signal continuously detected by the detecting means, Comparing means for comparing the pitch of the second input signal detected by the detecting means within a predetermined interval preset from the time of the final detection of the pitch of the first input signal, and the comparison result by the comparing means. When the pitch of the second input signal is n (n is a positive integer) times the pitch of the first input signal, a string number preset corresponding to the first pitch is set. The display means Tuning device characterized in that it comprises a display control means for displaying.