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Description  |
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FIELD OF THE INVENTION
This invention relates to tuning of musical instruments. More particularly,
this invention relates to techniques for automatically tuning musical
instruments. In another aspect, this invention relates to techniques and
systems for automatically tuning stringed musical instruments.
BACKGROUND OF THE INVENTION
Tuning of musical instruments is a difficult and tedious yet very necessary
procedure for musicians. This is especially true when two or more
instruments must be tuned to play at the same time. For example, musicians
in an orchestra or a band must have their instruments in tune with each
other, and tuned properly, before they can play music together. An even
larger complication arises when the musicians or artists attempt to change
to and from keys having different base interval relationships.
At times a group of musicians will start playing a song only to realize
that one of the group needs to tune his or her instrument. Then a decision
must be made to either continue playing out of tune or to stop, tune the
instrument, and re-start. If this happens in front of an audience it can
be very embarrassing. Of course, there is no guarantee that the state of
tune will be any better following re-tuning. Furthermore, the time lost in
re-tuning can be irritating to everyone.
Some musical instruments can be tuned in many different ways. For example,
the guitar has a dozen different "open tunings", each of which has special
advantages for playing certain songs. The performer usually does not want
to retune during a performance so he brings to the stage a guitar for each
open tuning he will use. Each such guitar must be separately tuned and
must be maintained in that condition up to the time it is played. For
several different open tunings, this procedure necessitates having several
different guitars. This can be quite costly, and it also requires the
performer to take the time to change guitars during a performance.
Furthermore, stringed instruments can change enough during a performance to
go out of tune. This may be caused by a variety of factors such as
humidity, temperature, and continued stress on the strings during playing.
Some musicians are better than others in tuning an instrument. As a result,
some musicians are able to tune an instrument correctly in a reasonable
period of time, while others (e.g. inexperienced musicians) may require a
long period of time to tune and may not be entirely accurate in doing so.
Although there has been previously proposed a tuning apparatus (see, for
example, U.S. Pat. No. 4,088,052) to detect the pitch in a stringed
instrument electronically, such apparatus is not capable of automatically
tuning the instrument. Furthermore, such apparatus can only tune one
string at a time. There is also the possibility of error introduced by the
mechanical portion of the system. Moreover, the apparatus uses analog
filtering which has inherent limitations.
It is also necessary for the string being tuned to be vibrating during the
entire tuning process. Another limitation of this apparatus is that it
cannot compensate for the effects of neck warpage etc. during tuning of a
guitar, for example.
Other types of tuning devices and tuning apparatus are disclosed in the
following patents: U.S. Pat. Nos. 4,196,652 (Raskin); 4,207,791
(Murakami); 4,313,361 (Deutsch); 4,327,623 (Mochida); 4,426,907 (Scholz);
and 4,584,923 (Minnick).
Each of the prior devices and apparatus exhibit various disadvantages and
limitations, however. The primary disadvantage of the prior devices is
that they utilize analog filtering of interfering signals to determine the
frequencies generated by the instrument. This is not very precise.
Furthermore, in an analog system the frequencies must be excited during
the entire tuning process.
All of these prior devices are relatively slow in tuning. A device which
tunes one string at a time must iterate several times to compensate for
non-linear components. Also, none of such devices provide for friction in
the nut or bridge. Locations of friction in a guitar or the like are the
bridge and/or nut and the tuning peg mechanism. At the bridge or nut a
string will move in short spurts due to differences between the
coefficients of static and kinetic friction. That is, once a string begins
to move it moves further than desired during tuning. The tuning peg
mechanism involves considerable friction. Further, none of the prior
devices provide compensation for non-linear effects. Non-linear effects
include factors such as temperature changes and neck warpage. Nor do any
of the prior devices have versatility which enables expansion for
interfacing several instruments simultaneously.
For example, several of such devices are only capable of tuning one string
at a time. Other devices have inadequate visual readout. Some of the
devices are only capable of tuning to equal temperment, and some are only
capable of tuning to predetermined frequencies with no variation possible.
Also, the possibility of human error still exists with respect to the use
of certain devices.
Certain of the devices are capable of tuning a string only when the string
is vibrating with enough amplitude to fall into the constraints of the
electronic components included in the device. If the amplitude of the
signal is not great enough to enable the electronics involved, then the
string cannot be tuned at all until the string is re-excited.
Further, certain of the devices use inadequate filtering techniques. Analog
filters introduce phase errors into the filtered frequency. When the
reference frequency is compared to the filtered frequency errors can occur
because there is a phase difference in the two signals.
In yet another respect, some of the devices are mechanically complex and
therefore are expensive and prone to unreliability if there is a
mechanical failure.
One of the prior devices senses string tension as a means for changing the
frequency. This technique has several inherent disadvantages. The number
of vibrations per second is inversely proportional to the length of the
string and the thickness of the string. It is also proportional to the
square root of the tension to which the string is subjected. Finally, the
number of vibrations is inversely proportional to the square root of the
density of the string. The thickness or cross-sectional area of the string
changes in character chiefly due to the stress on the string during
playing. Because of the changes in the cross-sectional area the frequency
is not in a perfectly linear relation to the tension. Consequently, this
method of sensing tension is inferior.
None of the prior tuning devices or apparatus provide the advantages
exhibited by the system and techniques of the present invention.
SUMMARY OF THE PRESENT INVENTION
In accordance with the present invention there is provided a system for
automatically tuning a musical instrument having adjustment means for
changing the frequency of a musical tone produced by the instrument. The
system comprises:
(a) a detection means adapted to detect a musical tone produced by said
instrument and produce a signal;
(b) converter means adapted to convert said signal to a digital signal;
(c) processing means adapted to convert said digital signal to a frequency
signal;
(d) comparator means for comparing said frequency signal to a predetermined
frequency value and producing an electrical signal;
(e) motor means activated by said electrical signal; wherein said motor
means is operably connected to said adjustment means for adjusting said
frequency to correspond with said predetermined value.
The system may also include compensating means for compensating for
non-linear effects of the instrument, such as warpage, temperature, and
humidity. The compensating means can also compensate for linear effects.
The tuning system of the invention is useful in connection with a wide
variety of musical instruments, including stringed and non-stringed
instruments. For example, it is useful for tuning guitars, harps, pianos,
horns, etc.
The tuning system is capable of automatically tuning all strings of an
instrument simultaneously in a rapid and efficient manner. Prior tuning
systems have not provided this capability.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in more detail hereinafter with reference to the
accompanying drawings, wherein like reference characters refer to the same
parts throughout the several views and in which:
FIG. 1 is a block diagram illustrating the tuning system of the present
invention;
FIG. 2 is an isometric drawing illustrating one embodiment of an automatic
tuning assembly of this invention as incorporated into a six-string
guitar;
FIG. 3 is a side view of the tuning assembly shown in FIG. 2;
FIG. 4 is a front view of the tune lever assembly shown in FIGS. 2 and 3.
DETAILED DESCRIPTION OF THE INVENTION
Tuning of an instrument such as a stringed instrument involves tightening
each string so that it exhibits a particular frequency signal when in
motion. The exact frequency which is desired to be produced or generated
by each string is dependent upon the type of tuning performed. For
example, an instrument can be tuned to a "true" scale or a "tempered"
scale. The frequency intervals between each string on each of these
different scales are different but are nevertheless related to each other
by specific ratios.
When an instrument is not in proper tune, it means that one or more of the
strings is not vibrating at the proper or intended frequency. The ratios
between the fundamental frequencies on the true scale are supposed to be
small whole numbers. Whenever one or more of the strings is out of proper
tune the resulting sound of the instrument may be referred to as
dissonance. This is very displeasing, especially if the strings are
significantly out of tune.
In the automatic tuning system of this invention the frequencies generated
by the instrument in a state of open tune, for example, are sampled and
determined. Then, using a table or relationship of the correct frequencies
for the instrument, an error for each frequency generated by the
instrument is determined. The error signal is applied to an
electromechanical system which then brings each string to a new state of
tuning. For non-stringed instruments the electromechanical system may move
a slide, for example, to change the frequency.
The process of sampling the frequencies generated by the instrument may be
repeated as often as needed to allow compensating means to compensate for
linear and non-linear effects. The compensating means comprises a computer
alogorithm which is updated during each samplying regarding any linear or
nonlinear behavior of the instrument during tuning. Following complete
algorithm updating, any different predetermined state of tuning may be
achieved by requesting the electromechanical system to alter the
frequencies of the strings. Virtually any parameter which affects the
state of tuning of a musical instrument can be included in the computer
based state equation for the instrument. As an example, the effect of
temperature change during long outdoor performances can be determined and
used in the tuning system. The system of the invention can be used not
only for open tuning, but also for tempered or true tuning.
The system being described herein may be applied to many musical
instruments.
FIG. 1 is a schematic diagram illustrating the automatic tuning system of
this invention. As one example, the tuning system may be used in
connection with a stringed instrument such as a guitar. Once the strings
are excited, a transducer such as a magnetic pickup detects musical tones
produced by the guitar and produces a corresponding blended signal which
is converted to a digital signal by a conventional analog-to-digital
converter. Then the digital signal is transferred to a computer which
processes the signal using a fast Fourier transform (FFT) to convert the
signal to a frequency signal. Then the computer compares the frequency
signal to predetermined frequency values and produces corresponding
electrical signals. Then each electrical signal activates a motor (e.g., a
stepper motor) which is operably connected to adjustment means for
adjusting the frequency of the corresponding string to correspond with the
predetermined value. The tuning system is capable of tuning all strings of
a stringed instrument simultaneously.
As an example of a typical application, the details of a system for guitar
will be given where appropriate. The system will automatically adjust the
frequency of a vibrating string on a musical instrument by changing the
tension of the string using data gathered from a transducer coupled to the
instrument. The system can be further adapted to adjust the frequency or
frequencies of any musical device where there exists:
(1) a suitable means of transducing those frequencies for computer
analysis, and
(2) a suitable means of transducing the results of the computer analysis to
adjust the frequency or frequencies of the musical device.
Thus, the tuning system of the invention can also be used in connection
with other instruments such as a horn, or a harp, or a piano, for example.
This is also illustrated in the schematic of FIG. 1. For example, a horn
can include a slide mechanism which allows for changing of the frequency
of a musical tone produced by the horn. Also, the tuning instrument may be
used in connection with a harp or piano.
Various types of detection means may be used to detect the musical tone
produced by a musical instrument and produce a corresponding analog
signal. For example, any conventional transducer may be used. Thus, there
may be used a magnetic pickup for some types of instruments; a microphone;
a piezoelectric pickup; optical means; etc. These types of transducers are
all useful in certain situations.
The system is described hereinafter with reference to the automatic tuning
of a six string electric guitar.
Data Acquisition
The signal from a standard six string magnetic guitar pickup is fed to an
analog to digital convertor (ADC). The signal must be amplified and
filtered between the magnetic pickup and the ADC with the following
general requirements:
(1) the signal must be between half and full scale on the ADC during
acquisition, and,
(2) frequencies greater than the fundamental frequency of the highest
string be effectively attenuated.
Usually this is string #1 tuned to E.sub.4 with frequency of 329 Hz. In
practical use, the system
may be required to adjust string #5 on a 12 string guitar which is G.sub.4
at 392 Hz.
Special limiting circuitry may be used if necessary, to provide a signal of
the proper amplification. Filtering of 12 to 24 db per octave rolloff
starting at a point 10% above the highest string's frequency will be
adequate.
Computer Analysis
The data will be acquired starting shortly after all the strings have been
set in motion with a "strum". To encompass an acquisition window 10%
greater than the highest frequency possible, 392 Hz+39 Hz=431 Hz is
required. To define a sinusoidal wave, a minimum of two points per cycle
must be acquired (Nyquist sampling theorum). Doubling 431 Hz to 862
points/second gives a data acquisition rate of 1.16 milliseconds/point. An
acquisition data array of 1024 points requiring just over 1 second is
adequate.
After the data has been acquired, a transformation is performed by the
computer shifting the data from the time domain (in which it was acquired)
to the frequency domain. In the time domain, the frequency information for
each string is hopelessly combined with the frequency information for all
the other strings. It is not practical, if even possible, for the computer
to extract from the time domain data the information necessary for the
decisions required during string adjustment. By transforming the time
domain data into the frequency domain, the frequency data for each string
emerges from that of the others in such a way that the computer can easily
determine the frequency of each string. The tranformation is called the
fast Fourier transform (FFT) developed by Cooley and Tukey in 1965. The
analysis of the frequency data will require an array of at least 4096
points giving a resolution of at least 431 Hz/4096 points=0.105 Hz/point.
To achieve this array size, the 1024 data points acquired may be "zero
filled" out to 4096. This adds no new information to the data. The result
is that more points define the "peaks" for each string making the
frequency determination process more precise.
Following the FFT, the computer determines the frequency of each string,
compares this value with the currently requested value for that string,
and determines the correction, if any, to be applied. The correction is in
the form of the numbver of steps and the direction of rotation to be
delivered to a stepper motor. The shaft of the stepper motor is connected
to the "tuning peg" shaft for the string via a gear or lever reduction
system. This is shown in FIGS. 2, 3 and 4.
Thus, there is shown an electromechanical system 10 for incorporation into
a guitar for selective adjustment of the length of the separate strings to
adjust the frequency thereof. Bridge assembly 12 is secured to the top
face of the guitar. This assembly includes base 14 which carries several
individual rollers 16. Each roller supports a single string 17 of the
guitar at the tail end. The rollers 16 rotate freely so as to impart
minimal friction to movement of the strings as they are tightened or
loosened.
Tail piece or tune lever assembly 20 is secured in a recessed area in the
guitar. Assembly 20 includes king posts 22 and king post bases 23 on each
end which support dowel pin 24. Supported on dowel pin 24 are six
individual lever arms 26 and free rotating rollers 27.
The upper end of each lever arm 26 is free to pivot on dowel pin 24. The
lower end of each lever arm includes a pin joint 28 which is adapted to
engage a threaded shaft 30 controlled by a stepper motorl 32. Each stepper
motor includes a thrust bearing 31. A mounting assembly 34A, including
mounting plate 34, is secured to each stepper motor and serves as a means
for mounting each motor to a tilt mount 35 in the recessed area of the
guitar in a manner such that the motor can pivot slightly. The end of each
string includes an enlarged section (not shown) which is captured in
holder 25 on each lever arm 26.
Thus, upon receipt of an electrical signal from the computer, each stepper
motor rotates a corresponding shaft 30 in order to pivot a lever arm 26.
This causes the corresponding string 17 to be either loosened or
tightened, as required, to adjust it to the desired frequency.
Because a general purpose computer system is used in the decision making
process, information regarding such things as the interaction among the
strings as they are tuned can be included. An example of this is the "neck
bowing" caused by the change in tension of the string being tuned. This
causes a change in the tension of strings not being tuned resulting in an
unwanted change in their frequencies. These kinds of interactions are all
well documented in the musical literature to the extend that many have
complete equations describing their effects. Utilizing this information,
the movement of all the strings to their correct frequencies can be done
all at once rather than the more lengthy "trial and error" procedure used
previously.
To eliminate detailed consideration of these and other algorithms, the
system will "calibrate" the guitar before each playing by allowing the
computer system to measure all the effects possible. One could use a
small, computer controlled "strummer" allowing the computer to
automatically go through a series of tests by setting up the data
acquisition, actuating the "strummer", collecting the data, updating its
total algorithm, then looping through the analysis until the calibration
process is complete. Following this, the "tuning" of the guitar could be
changed to any predetermined state using the calibration algorithm without
further need of recalibration. Examples are the 12 standard "open"
tunings, equal tempered tuning, just tuning in musical pitch, and varying
the pitch of any of these tuning modes by four half steps up or down
during the playing of a song.
String Adjustment
Each string may be wound around a machined shaft and connected to a stepper
motor via a suitable gearbox. This will establish a relationship between
the number of steps required to produce a given change in the frequency of
a string. If the computer is allowed to "calibrate" before use, the
details of how each motor transduces "steps" into "frequency change" can
all be included in the computer algorithm. This reduces the dependence of
the system performance on the machine steps to the point where the only
requirement is reproducability.
The connection to the stepper motors is a very simple digital pulse
interface common to most computers. When the system determines the correct
number of steps for each motor, these steps are sent as
transistor-transistor logic (TTL) level pulses over the digital lines to
each motor using standard TTL techniques. The system may include means for
first "loading" a pulse count into all motor controllers followed by a
"go" command such that all motors move in unison.
Stepper Motors and Mechanical System
The mechanical details of the application of the current system to the
tuning of a six string guitar will now be given. Table I gives the worst
case values for the movement and tension of the six strings.
TABLE I
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Worst Case Tensions and Motions of Strings at Bridge
string motion.sup.1
string tension.sup.2
string (in) (lbs)
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1 0.110 20
2 0.063 25
3 0.035 38
4 0.059 36
5 0.047 33
6 0.035 28
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string motion: 600 cents, 2 frets over to 4 frets under normal tuning
.sup.1 steel strings: 0.009, 0.011, 0.016, 0.024, 0.036, 0.042 (in)
.sup.2 phosphor bronze strings: 0.010, 0.014, 0.023, 0.030, 0.039, 0.047
(in)
The drawings show a mechanical configuration for the adjustment of string
tension on the guitar. Each string is attached to a curved hard metal
surface or string holder which rotates on a shaft that is concentric with
the curved surface. The simplicity of the connection of the string to the
system removes the need for a more complicated routing of the string,
possibly over one or more pulleys. This configuration provides a minimum
value for friction in this area where the forces are highest.
Connected to the string holder is a "lever" which provides the initial
mechanical advantage in the system. If the radius of the string holder
surface is "a" and the effective lever length is "b", the ideal mechanical
advantage of the lever is b/a. Let the ratio b/a=10. Two useful
relationships are thus determined:
force at end of lever=string tension/10
travel of end of lever=string motion * 10
The end of the lever is driven by a lead screw connected to a stepper
motor. Let the following describe this configuration:
lead screw: 40 threads/in
motor steps/revolution: 48 (Airpax #K82201-P2)
dynamic motor torque: 0.60 oz-in, 3.75.times.10.sup.-2 lb-in (Airpax
#K82201-P2)
holding motor torque: 1.4 oz-in, 8.75.times.10.sup.-2 lb-in (Airpax
#K82201-P2)
Then there are 192 steps/in on string motion at the bridge and, without
friction, the dynamic force on the string at the bridge is 94.2 lbs., and
the holding force on the string at the bridge is 287 lbs. Table II shows
the resulting settability for each string.
TABLE II
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Total Steps for Worst Case Motions
Precision of String Frequency Setting, and Times for 100 cents
times for 100 cents at
total cents/
200 step/sec
600 steps/sec
string
steps steps/cent
step (sec) (sec)
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1 2112 3.52 0.284 1.76 0.59
2 1212 2.02 0.496 1.01 0.34
3 672 1.12 0.893 0.56 0.19
4 1134 1.89 0.530 0.95 0.32
5 1422 2.37 0.423 1.19 0.04
6 672 1.12 0.893 0.56 0.19
______________________________________
NOTE: 100 cents = 1/2 step
FIGS. 2 and 3 show the mechanical configuration of the string, lever,
leadscrew, and stepper motor. The stepper motor is connected via suitable
cable to the pulse output of digital computer/logic interface in standard
fashion.
The "strummer", mentioned above, is connected to a similar computer
interface and will excite the strings of the guitar on command from the
computer.
Finally, the output from the guitar's amplifier is fed through a
programmable filter to a standard analog to digital converter system in
the computer. The analog to digital conversion frequency and the filter
frequency are controlled by the computer in accordance with the Nyquist
sampling theorum to prevent "aliasing" in the data. Generally, the
conversion frequency must be faster than two times the maximum frequency
of the signal of interest. Additionally, the filter corner frequency must
be set to just above the maximum frequency of interest (10% is usually
chosen to prevent filter generated phase problems near the edges of the
resulting spectrum).
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