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Claims  |
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What is claimed is:
1. An electronic tuning apparatus comprising:
(a) input means for inputting a tone signal to be measured;
(b) signal generating means for generating a plurality of reference
frequency signals, respectively, corresponding to a plurality of
predetermined tone names independently for each tone;
(C) a plurality of groups of luminous elements, respectively, corresponding
to said plurality of tone names;
(d) a plurality of display control means arranged, respectively,
corresponding to said plurality of tone names; and in which
each of said display control means drives the group of luminous elements
corresponding to said tone name on the basis of the reference frequency
signal of the corresponding tone name from said signal generating means
and the input tone signal from said input means, and an on-off arrangement
pattern composed of turned-on luminous elements and turned-off luminous
elements is differently displayed in the group of luminous elements
corresponding to said tone name between the case of the agreement of the
frequency of said input tone signal with the frequency of said tone name
at a certain octave and the case of the agreement with the frequency of
said tone name at another octave.
2. An electronic tuning apparatus according to claim 1, further comprising
scale selecting means, and in which said signal generating means generates
the reference frequency signal having the frequency corresponding to each
of said tone name according to the scale selected by said scale selecting
means.
3. An electronic tuning apparatus according to claim 2, in which said scale
selecting means include change-over switch means for selecting at least an
equal temperament scale and a just intonation scale.
4. An electronic tuning apparatus according to claim 1, further comprising
pitch adjusting means, and in which said signal generating means controls
the pitch of the reference frequency signal to be generated from said
signal generating means independently for each tone name by manipulating
said pitch adjusting means.
5. An electronic tuning apparatus according to claim 1, in which said
signal generating means include twelve tone generators generating twelve
reference frequency signals, respectively, corresponding to twelve tone
names.
6. An electronic tuning apparatus according to claim 5, in which
each of said plurality of display means of each tone name includes eight
luminous elements;
each of said plurality of display control means includes four hexadecimal
counters of a first, second, third and fourth and four decoders of a
first, second, third and fourth, respectively, connected to each output
side of said four hexadecimal counters;
each anode of said eight luminous elements is connected to each output side
of said four decoders;
said first hexadecimal counter for each tone name is connected to
corresponding each of said twelve tone generators;
said second hexadecimal counter is connected to said first hexadecimal
counter so that a frequency divided output, having a frequency of 1/4 of
the reference frequency signal inputted to said first hexadecimal counter,
is inputted;
said third hexadecimal counter is connected to said second hexadecimal
counter so that a frequency divided output, having a frequency of 1/16 of
said reference fequency signal, is inputted;
said fourth hexadecimal counter is connected to said third hexadecimal
counter so that a frequency divided output, having a frequency of 1/64 of
said reference frequency signal, is inputted; and
each cathode of said eight luminous elements is connected to said input
means so that the tone signal to be measured may be inputted to said each
cathode, each of said luminous elements is turned on only when a high
level signal is inputted to its anode side and a low level signal is
inputted to its cathode side.
7. An electronic tuning apparatus according to claim 1, in which said
plurality of groups of luminous elements is arranged in a line.
8. An electronic tuning apparatus according to claim 1, in which said
plurality of groups of luminous elements is arranged parallelly for each
group.
9. An electronic tuning apparatus comprising:
input means for inputting a tone signal to be measured;
signal generating means for generating a plurality of reference frequency
signals, respectively, corresponding to a plurality of predetermined tone
names independently for each tone;
a plurality of display means, respectively, corresponding to said plurality
of tone names;
a plurality of display control means arranged, respectively, corresponding
to said plurality of tone names;
scale selecting means; and in which
each of said display control means is constructed to display an agreement
of the frequency of said tone name at a predetermined octave with the
frequency of said input tone signal in the display means corresponding to
said tone name on the basis of the reference frequency signal of the
corresponding tone name from said signal generating means and the input
tone signal from said input means; and
said signal generating means generates the reference frequency having the
frequency corresponding to each of said tone name according to the scale
selected by said scale selecting means.
10. An electronic tuning apparatus according to claim 9, in which said
scale selecting means include change-over switch means for selecting at
least an equal temperament scale and a just intonation scale.
11. An electronic tuning apparatus comprising:
input means for inputting a tone signal to be measured;
signal generating means for generating a plurality of reference frequency
signals, respectively, corresponding to a plurality of predetermined tone
names independently for each tone;
a plurality of display means, respectively, corresponding to said plurality
of tone names;
a plurality of display control means arranged, respectively, corresponding
to said plurality of tone names;
pitch adjusting means; and in which
each of said display control means is constructed to display an agreement
of the frequency of said tone name at a predetermined octave with the
frequency of said input tone signal in the display means corresponding to
said tone name on the basis of the reference frequency signal of the
corresponding tone name from said signal generating means and the input
tone signal from said input means; and
said signal generating means controls the pitch of the reference frequency
signal to be generated from said signal generating means independently for
each tone name by manipulating said pitch adjusting means.
12. An electronic tuning apparatus comprising:
input means for inputting a tone signal to be measured;
signal generating means for generating a plurality of reference frequency
signals, respectively, corresponding to a plurality of predetermined tone
names independently for each tone;
a plurality of display means, respectively, corresponding to said plurality
of tone names;
a plurality of display control means arranged, respectively, corresponding
to said plurality of tone names; and in which
each of said display control means is constructed to display an agreement
of the frequency of said tone name at a predetermined octave with the
frequency of said input tone signal in the display means corresponding to
said tone name on the basis of the reference frequency signal of the
corresponding tone name from said signal generating means and the input
tone signal from said input means;
said signal generating means includes twelve tone generators generating
twelve reference frequency signals, respectively, corresponding to twelve
tone names;
each of said plurality of display means of each tone name includes eight
luminous elements;
each of said plurality of display control means includes four hexadecimal
counters of a first, second, third and fourth and four decoders of a
first, second, third and fourth, respectively, connected to each output
side of said four hexidecimal counters;
each anode of said eight luminous elements is connected to each output side
of said four decoders;
said first hexadecimal counter for each tone name is connected to
corresponding each of said twelve tone generators;
said second hexadecimal counter is connected to said first hexadecimal
counter so that a frequency divided output, having a frequency of 1/4 of
the reference frequency signal inputted to said first hexadecimal counter
is inputted;
said third hexadecimal counter is connected to said second hexadecimal
counter so that a frequency divided output, having a frequency of 1/16 of
said reference frequency signal, is inputted;
said fourth hexadecimal counter is connected to said third hexadecimal
counter so that a frequency divided output, having a frequency of 1/64 of
said reference frequency signal, is inputted; and
each cathode of said eight luminous elements is connected to said input
means so that the tone signal to be measured may be inputted to said each
cathode, each of said luminous elements is turned on only when a high
level signal is inputted to its anode side and a low level signal is
inputted to its cathode side.
13. An electronic tuning apparatus according to claim 12, in which each
eight luminous elements, respectively, connected to said first, second,
third and fourth decoders are arranged in a line.
14. An electronic tuning apparatus according to claim 12, in which each
eight luminous elements, respectively, connected to said first, second,
third and fourth decoders are arranged parallelly for each said decoder. |
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Claims |
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Description |
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BACKGROUND OF THE INVENTION
(a) Field of the invention
The present invention relates to an electronic tuning apparatus to be
appropriately used for tuning various musical instruments, for example,
such as a wood instrument, a brass instrument, a string instrument and a
percussion instrument etc. on the basis of the scale according to the
equal temperament and the scale according to any temperament other than
the equal temperament.
(b) Description of the prior art
A tuning apparatus for a musical instrument, which is proposed in a prior
art, is generally based on the equal temperament scale and, generally
classified, an electronic type and a mechanical type are known for it.
As to an electronic tuning apparatus, such an apparatus is known, which is
capable of displaying an agreement of frequency between a reference
frequency signal and a tone signal to be tuned in a single display, while
a reference frequency signal corresponding to a specified pitch is
generated by designating an octave and a tone name with a switch etc.
Further, as to a mechanical tuning apparatus, such an apparatus is known,
which is capable of displaying a stationary stroboscopic pattern for each
tone name in the corresponding display window at the moment of tuning by
making twelve stroboscopic pattern discs rotate at a number of revolution
corresponding to the equal temperament through a gear mechanism by a
synchronous motor driven by an output of a quartz oscillator, while twelve
display windows are provided on a panel corresponding to twelve tone
names, twelve stroboscopic pattern discs are arranged rotatably at the
backside of the panel corresponding to each of the display windows and
luminous elements, which turn on and off corresponding to the frequency of
a tone to be measured, are provided.
In the above-mentioned electronic tuning apparatus, there is a problem that
it takes a lot of time and labor for changing-over an octave and a tone
name by a switch etc. when tuning is performed by changing an octave and a
tone name successively and it takes a lot of time until a display of the
above-mentioned agreement is performed because it takes time for the
measurement of an input signal and the calculation of the average period
of an input signal even if a tone signal to be measured is inputted at the
same time with the change-over.
On the other hand, in the above-mentioned mechanical tuning apparatus,
there is not such an above-mentioned problem as found in the electronic
tuning apparatus because display sections for twelve tone names are always
ready for displaying the tuning, but there is a problem that it can not
respond to a scale other than the equal temperament (for example, just
intonation) unless a gear ratio of a gear mechanism is changed and further
that it is heavy-weighted, large-sized, inconvenient for handling and
expensive due to mechanical type.
SUMMARY OF THE INVENTION
The primary object of the present invention is to provide an electronic
tuning apparatus which can perform a tuning of each tone name easily and
quickly under the consideration of the above-mentioned reasons.
The tuning apparatus according to the present invention comprises input
means for inputting a tone signal to be measured, signal generating means
for generating a plurality of reference frequency signals, respectively,
corresponding to a plurality of tone names independently for each tone, a
plurality of display means, respectively, corresponding to a plurality of
tone names and a plurality of display control means, respectively,
corresponding to a plurality of tone names. Each of display control means
is constructed so as to display an agreement of the frequency of said tone
name at a predetermined octave with the frequency of said input tone
signal in the display means corresponding to said tone name on the basis
of the reference frequency signal of the corresponding tone name from
signal generating means and the input tone signal from the input means.
As a reference frequency signal can be generated independently for each
tone name according to the present invention, it is easy to reset each
frequency according to a scale other than the equal temperament scale even
if frequencies of a plurality of reference frequency signals are preset
according to the equal temperament scale. Further, as a display of a
tuning is made possible for each of display means by providing respective
display means for a plurality of tone names, it is not necessary to
changeover octave and tone name so that the time required for displaying
the measurement results, after a tone signal to be measured is inputted,
is remarkably shortened.
In the above described constitution of the present invention, each of
display means may be constructed of a group of luminous elements and
further each of display control means may be constructed so that, by
driving the group of luminous elements corresponding to the tone name on
the basis of the reference frequency signal of the corresponding tone name
from the signal generating means and an input tone signal from input
means, an on-off arrangement pattern composed of turned-on luminous
elements and turned-off luminous elements is differently displayed from
each other between the case of the agreement of the frequency of the input
tone signal with the frequency of said tone name at a certain octave and
the case of the agreement with the frequency of said tone name at another
octave. In such a way it is capable of displaying the tuning of a
plurality of octaves by each group of luminous elements so that the number
of the groups of luminous elements can be made smaller than the case
wherein a group of the luminous elements is provided for each octave.
Furthermore, due to the construction mainly composed of an electronic
circuit, the tuning apparatus of the present invention is compact,
light-weighted and easy for handling and additionally it can be
manufactured at low cost.
The above and other objects, features and advantages of the present
invention will become more apparent from the following description when
taken in conjunction with the accompanying drawings in which a preferred
embodiment of the present invention is shown by way of illustrative
example.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a block diagram showing a circuit composition of a tuning
apparatus according to an embodiment of the present invention;
FIG. 2 is an example of a scale information table to be stored in ROM shown
in FIG. 1;
FIG. 3 is a signal waveform for explaining the operation of a
counter/decoder section in a tuning apparatus shown in FIG. 1;
FIG. 4 is a front view of a display panel in a tuning apparatus shown in
FIG. 1;
FIGS. 5A to 5C are arrangement diagrams showing different examples of the
arrangement of a group of luminous elements acceptable for each display
section of the display panel shown in FIG. 4;
FIGS. 6 to 9 are signal waveform diagrams for explaining display operations
performed when an input tone frequency has each value of 1, 1/2, 1/4, and
1/8 of scanning frequency f.phi.; and
FIG. 10 is a diagram illustrating an example of a display pattern
corresponding to various input tone frequencies.
DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 1 shows a circuit composition of a tuning apparatus according to an
embodiment of the present invention.
Circuit composition (FIG. 1)
A microphone (MIC) 10 serves to input a tone signal to be measured from a
musical instrument etc. to be tuned and an inputted tone signal is
supplied to a current amplifying circuit 14 through an input amplifier 12.
The current amplifying circuit 14 is provided for driving the
below-mentioned luminous elements to be turned on and off and output a
current-amplified tone signal SS.
In this embodiment, a fundamental wave detecting circuit for detecting a
fundamental wave from an input tone signal and a waveform shaping circuit
for converting an input tone signal into a square wave are not provided.
The reason why a fundamental wave detecting circuit is not provided is
that it is considered that in a brass instrument a pitch is determined by
a harmonic component and the reason why a wave shaping circuit is not
provided is that the wave shaping circuit disturbs a quick display by
acting as a delay circuit. The fundamental wave detecting circuit and the
waveform shaping circuit may be provided according to a necessity.
A reference frequency signal generating circuit 16 is composed of twelve
tone generators which generate reference frequency signals of .phi..sub.1,
.phi..sub.2, . . . , .phi..sub.12 corresponding to twelve tone names of C,
C.sup.# . . . , B independently for each tone name. In this case, the
term "independently for each tone name" means that even if the frequency
of a signal .phi..sub.1, for example, is changed, the frequency of other
signals such as .phi..sub.2 etc. does not change. Therefore, a typical
example of the circuit 16 comprises twelve pulse oscillators in which each
oscillation frequency can be preset variably. To this circuit 16 through a
bus 18 are connected a random access memory (RAM) 20, a read-only memory
(ROM) 22 and a central processing unit (CPU) 24. In ROM 22 a scale
information table, for example, as shown in FIG. 2 is stored.
Although, as for a scale selecting switch 26, an equal temperament scale
selecting switch ETS and a just intonation scale selecting switch JIS are
provided, switches for selecting other scales such as Pythagorean scale
etc. may be provided as occasion arises. When the equal temperament scale
selecting switch ETS is switched on, CPU 24 reads scale information data
as shown in the column of "EQUAL TEMPERAMENT" in FIG. 2 from ROM 22 and
transfers it to a reference frequency signal generating circuit 16. From
the reference frequency signal generating circuit 16 are generated, as an
example, reference frequency signals .phi..sub.1, .phi..sub.2, . . . ,
.phi..sub.12 having frequencies corresponding to each tone name of
C.sub.9, C.sub.9.sup.#, . . . , B.sub.9. On the other hand, when the just
intonation scale selecting switch JIS is switched on, in accordance with
the same procedure as mentioned above, frequencies of the reference
frequency signals .phi..sub.1, .phi..sub.2, . . . , .phi..sub.12 are
preset according to the just intonation scale.
In order to be capable of adjusting the pitch of each tone name
independently, a pitch adjustor 28 has a pitch-up switch US and a
pitch-down switch DS corresponding to each of twelve tone names of C,
C.sup.#, . . . , B. A pitch control according to the manipulation of these
switches US, DS is capable only when a pitch adjusting switch SW is
switched on. That is to say, when the pitch-up switch US or the pitch-down
switch DS is manipulated for each tone name under the on-state of the
pitch adjusting switch SW, correspondingly the corresponding data stored
in ROM 22 is stored into RAM 20 after being adjusted. Each adjusted value
is read from RAM 20 by CPU 24 and supplied to the reference frequency
signal generating circuit 16 in order to control the frequency of
reference frequency signals .phi..sub.1 .about..phi..sub.12 independently
for each tone name. Therefore, by manipulating the pitch-up switch US or
the pitch-down switch DS of the tone name C, for example, correspondingly
the frequency of the reference frequency signal .phi..sub.1 is preset
independently higher or lower than the reference value. When the pitch
adjusting switch SW is switched off, the data of ROM 22 are used
irrespective of the data of RAM 20.
Scanning/display circuits 30(1).about.30(12), which receive the reference
frequency signals .phi..sub.1 .about..phi..sub.12 respectively and all of
which receive a tone signal at the same time, are constructed so as to
display a tuning in a plurality of the groups of luminous elements on the
basis of the signal received, respectively, in each circuit. As these
circuits 30(1).about.30(12) have the same composition and operate in a
similar way, the composition and the operation of a circuit 30(1) will be
described below by way of example.
In the circuit 30(1), four hexadecimal counters CN.sub.1 .about.CN.sub.4,
four decoders DC.sub.1 .about.DC.sub.4 and four groups of luminous
elements LG.sub.1 .about.LG.sub.4 are provided.
To the counter CN.sub.1 a reference frequency signal .phi..sub.1 is
supplied as an input to be countered, to a counter CN.sub.2 a frequency
divided output .phi..sub.1 /4, having a frequency of 1/4 of the signal
.phi..sub.1, is supplied as an input to be countered from the counter
CN.sub.1, to a counter CN.sub.3 a frequency divided output .phi..sub.1
/16, having a frequency of 1/16 of the signal .phi..sub.1, is supplied as
an input to be countered from the counter CN.sub.2 and to a counter
CN.sub.4 a frequency divided output .phi..sub.1 /64, having a frequency of
1/64 of the signal .phi..sub.1, is supplied as an input to be countered
from the counter CN.sub.3.
Decoders DC.sub.1 .about.DC.sub.4 are provided so as to decode the count
output (code output composed of 4 bits S.sub.1 .about.S.sub.4) from each
counter of CN.sub.1 .about.CN.sub.4. It is disposed such that groups of
luminous elements LG.sub.1 .about.LG.sub.4 are connected to the output
side of the decoders DC.sub.1 .about.DC.sub.4, respectively, and, as shown
in the decoder DC.sub.1 of FIG. 1, eight luminous elements (light emitting
diode, for example) of the group of luminous elements corresponding to the
said decoder are driven, respectively, from the anode side by the
odd-numbered outputs Q.sub.1, Q.sub.3, . . . , Q.sub.15 of outputs Q.sub.0
.about.Q.sub.15 for each decoder.
All luminous elements belonging to the groups of luminous elements LG.sub.1
.about.LG.sub.4 are driven from the cathode side by a tone signal. Each
luminous element emits light when a driving current exceeds a
predetermined level.
Operation of counter/decoder section (FIG. 3)
Then, referred to FIG. 3, the operation of the counter/decoder section will
be described below according to the counter CN.sub.1 and the decoder
DC.sub.1 by way of example.
The counter CN.sub.1 generates frequency divided outputs S.sub.1, S.sub.2,
S.sub.3, S.sub.4, respectively, corresponding to 1/2, 1/4, 1/8, 1/16 of
the frequency of the signal .phi..sub.1 by counting the pulse of the
reference frequency signal .phi..sub.1 successively from the first one.
These reference frequency outputs are supplied to the decoder DC.sub.1 as
a count output of counter circuit and then decoded. As a result, from the
decoder DC.sub.1 the output signals Q.sub.1, Q.sub.3, Q.sub.5, . . .
Q.sub.15 are successively generated corresponding to the count value of 1,
3, 5, . . . , 15 of the counter CN.sub.1.
The count value of the counter CN.sub.1 is reset to zero synchronously to
the down of the 16th pulse of the signal .phi..sub.1 and thereafter the
operation of generating the output signals of Q.sub.1 .about.Q.sub.15 is
repeated successively in the same way as above-mentioned. Therefore, eight
luminous elements of the group of luminous elements LG.sub.1 are scanned
successively and repeatedly corresponding to output signals Q.sub.1
.about.Q.sub.15. The scanning frequency f.phi. is corresponding to the
frequency divided output S.sub.1 at this time and therefore if the
frequency of the signal .phi..sub.1 is corresponding to the tone C.sub.9,
f.phi. corresponds to the tone C.sub.8.
Display panel constitution (FIGS. 4 and 5)
FIG. 4 shows an example of display panel constitution of the
above-mentioned tuning apparatus.
In a display panel 32, twelve display sections corresponding to twelve tone
names of C, C.sup.#, . . . , B are arranged in a similar way as the
arrangement of white and black keys on the keyboard and in each display
section DR, the groups of luminous elements LG.sub.1 .about.LG.sub.4 are
arranged in a row, for example, in a right and left direction as shown in
FIG. 5A.
As for the arrangement of the groups of luminous elements in each display
section DR, the arrangement of the groups of luminous elements LG.sub.1
.about.LG.sub.4 in four rows of a right and left direction as shown in
FIG. 5B or the arrangement of the group of luminous elements LG.sub.1
.about.LG.sub.4 in four columns of upward and downward direction as shown
in FIG. 5C and so on may be adoptable.
Display operation (FIGS. 6 to 10)
FIGS. 6 to 9 show display operations of the group of luminous elements
LG.sub.1 when the input tone frequency (frequency of tone signal SS) fs
has each value of 1, 1/2, 1/4 and 1/8 of the scanning frequency f.phi.. In
these figures, for the sake of convenience, the tone signal SS is assumed
as a square wave having a frequency corresponding to the input tone and
further a hatched circle-mark shows a turned-on luminous element and a
non-hatched circle-mark shows a turned-off luminous element.
FIG. 6 shows a display operation in the case that an input tone frequency
fs is equal to a scanning frequency f.phi., wherein when the decoder
outputs Q.sub.1, Q.sub.3, Q.sub.5, . . . , Q.sub.15 take a high level and
correspondingly the tone signal SS takes a low level, all of eight
luminous elements of the group of luminous elements LG.sub.1 are turned on
as shown in FIG. 6(a). Further, it is assuemd that the tone signal SS has
a phase of 0.degree. at this time and on the contrary when the phase of
the tone signal is shifted by 180.degree., all of eight luminous elements
are turned off.
FIG. 7 shows a display operation in the case that the input tone frequency
fs is equal to 1/2 of the scanning fequency f.phi., wherein when the
decoder outputs Q.sub.1, Q.sub.5, Q.sub.9, Q.sub.13 take a high level,
respectively, and correspondingly the tone signal SS takes a low level,
eight luminous elements of the group of luminous elements LG.sub.1 are
turned on alternately as shown in FIG. 7(a). The same arrangement of
luminous elements turned on and off are produced as shown by the broken
line in FIG. 7(a) when the phase of the tone signal SS is shifted by
90.degree. from the waveform of solid line as shown in FIG. 7(a).
When the phase of the tone signal SS is shifted by 180.degree. as shown in
FIG. 7(b) compared to the case as shown in FIG. 7(a), eight luminous
elements are turned on alternately in a turned-on position different from
the position as shown in FIG. 7(a). A pattern similar to this is produced
when the phase of the tone signal SS is shifted by 90.degree. as shown by
the broken line in FIG. 7(b) compared to the solid line waveform in FIG.
7(b).
When the phase of the tone signal SS is advanced by 135.degree. compared to
the case as shown in FIG. 7(a), all of eight luminous elements are turned
on as shown in FIG. 7(c).
FIG. 8 shows a display operation in the case that the phase of the input
tone frequency fs is 1/4 of the scanning frequency f.phi., wherein when
the decoder outputs Q.sub.1, Q.sub.3, Q.sub.9, Q.sub.11 take a high level
respectively and correspondingly the tone signal SS takes a low level,
eight luminous elements of the group of luminous elements LG.sub.1 are
turned on by two elements for each four elements as shown in FIG. 8(a).
When the phase of the tone signal SS is shifted by 180.degree. as shown in
FIG. 8(b) compared to the case as shown in FIG. 8(a), eight luminous
elements are turned on by two elements for each four elements of eight
luminous elements in a turned-on position different from the position as
shown in FIG. 8(a).
FIG. 9 shows a display operation in the case that the phase of the input
tone frequency fs is 1/8 of the scanning frequency f.phi., wherein when
the decoder outputs Q.sub.1, Q.sub.3, Q.sub.5, Q.sub.7 take a high level
respectively and correspondingly the tone signal SS takes a low level,
four elements of eight luminous elements are turned on as shown in FIG.
9(a). Further, when as shown in FIG. 9(b) the phase of the tone signal SS
is shifted by 180.degree. compared to the case as shown in FIG. 9(a), four
elements of eight luminous elements are trurnd on in a turned-on position
different from the case as shown in FIG. 9(a).
FIG. 10 exemplifies luminous patterns of the groups of luminous elements
LG.sub.1 .about.LG.sub.4 displayed when the input tone frequency fs takes
each value of 1/1, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/128, 1/256, 1/512 of
the scanning frequency of f.phi. and in this figure, also, a hatched
circle-mark shows a turned-on luminous element and a non-hatched
circle-mark shows a turned-off luminous element.
Although a display operation of the group of luminous elements LG.sub.1 in
the case of fs=f.phi..about.f.phi./8 was mentioned above, a display
operation which is similar to the case of fs=f.phi./2.about.f.phi./8 is
carried out for the case of fs=f.phi./8.about.f.phi./32 by the group of
luminous elements LG.sub.2, for the case of fs=f.phi./32.about.f.phi./128
by the group of luminous elements LG.sub.3 and for the case of
fs=f.phi./128.about.f.phi./512 by the group of the luminous elements
LG.sub.4.
If the scanning frequency fs is assumed to correspond to C.sub.8 tone,
f.phi./2.about.f.phi./256 correspond to C.sub.7 tone.about.C.sub.0 tone.
Therefore, if in FIG. 10 an attention is payed to a display pattern
alternately turned on and a display pattern turned on by two elements for
each four luminous elements, a tuning can be confirmed concerning C.sub.0
tone and C.sub.1 tone in the group of luminous elements LG.sub.4,
concerning C.sub.2 tone and C.sub.3 tone in the group of luminous elements
LG.sub.3, concerning C.sub.4 tone and C.sub.5 tone in the group of
luminous elements LG.sub.2 and concerning C.sub.6 tone and C.sub.7 tone in
the group of luminous elements LG.sub.1. In other words, it is possible by
four groups of luminous elements to display an agreement of an input
frequency with the scanning frequency for eight different octaves of a
tone, so that the number of the group of luminous elements can be reduced
to a half compared to the case that an agreement of frequency is displayed
for each octave.
When an input frequency fs is shifted to a higher direction from a
reference frequency, for example, f.phi./2, it means that the period of
the tone signal SS is shorten in FIG. 7(a) so that the display pattern is
displaced from right to left at a speed proportional to the degree of the
shift and when shifted to a lower direction, the display pattern is
displaced from left to right at a speed proportional to the degree of the
shift respectively. Therefore, therefrom a direction of the shift and a
degree of the shift can be known. Anyway, if the arrangement of the groups
of luminous elements is reversed from the above-mentioned, the
above-mentioned direction of displacement can be reversed.
Use of tuning apparatus
In the case of using the above-mentioned tuning apparatus, the kind of the
scale which is desired for tuning is selected by a scale selecting switch
ETS or JIS beforehand. Furthermore, according to the necessity by
manipulating the switch US or DS of the pitch adjustor 28, the frequency
of the reference frequency signal corresponding to the desired tone name
is preset adequately. Thereafter, it is sufficient only to input the tone
to be tuned through a microphone 10.
When a tone of a musical instrument having a pitch approximate to C.sub.4
tone, for examle, is inputted, the arrangement pattern of the luminous
elements to be turned on and off as shown in FIG. 10 (two elements turned
on for each four elements) is displayed in the group of luminous elements
LG.sub.2 of the display section corresponding to the tone name C in the
display panel, wherein if the input tone frequency is higher the frequency
of the tone C.sub.4, this pattern is displaced at a speed corresponding to
the degree of a shift towards the left and if the input tone frequency is
lower than the frequency of the tone C.sub.4, this pattern is displaced at
a speed corresponding to the degree of a shift towards the right. Then, it
is sufficient for a player to adjust the pitch of a musical instrument
tone such that the above-mentioned pattern displacement will be made
stationally.
Anyway, without limiting the number of tones to be inputted through a
microphone 10 to only one tone, tones of a plurality of musical
instruments composing, for example, a band may be inputted simultaneously.
When a plurality of tones are inputted in such a way simultaneously, the
above-mentioned display is executed in the display section corresponding
to each tone name.
Furthermore, the desired turned-on pattern can not be displayed sometimes
depending on the phase of the input tone signal such as an example as
shown in FIG. 7(c) and in this case it is sufficient to re-input the
musical instrument tone.
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