US3795754A - Electronic musical instruments with two master oscillators - Google Patents

Electronic musical instruments with two master oscillators Download PDF

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Publication number
US3795754A
US3795754A US00230588A US3795754DA US3795754A US 3795754 A US3795754 A US 3795754A US 00230588 A US00230588 A US 00230588A US 3795754D A US3795754D A US 3795754DA US 3795754 A US3795754 A US 3795754A
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Prior art keywords
master
frequency
octave
notes
frequency dividers
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Expired - Lifetime
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US00230588A
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English (en)
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Y Mochida
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Nippon Gakki Co Ltd
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Nippon Gakki Co Ltd
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H5/00—Instruments in which the tones are generated by means of electronic generators
    • G10H5/02—Instruments in which the tones are generated by means of electronic generators using generation of basic tones
    • G10H5/06—Instruments in which the tones are generated by means of electronic generators using generation of basic tones tones generated by frequency multiplication or division of a basic tone
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S84/00—Music
    • Y10S84/11—Frequency dividers

Definitions

  • ABSTRACT [30] Fofeign A fi fi priority Data A tone generator for electronic musical instruments comprising first and second master oscillators of dif- Mar. 6, 1971 Japan 4644335 g ferent oscillation frequencies by a semi-tone and 12 master frequency dividers respectively corresponding to, 12 notes in an octave, the output of the firstmaster [58] Field of Search 84/101, 103, 1.11, 1,19, 3 9 the f.
  • This invention generally relates to a tone generator to be used in electronic musical instruments, and more particularly to a type thereof wherein required tones are obtained by frequency dividing procedure.
  • a typical example of the tone generator heretofore proposed by the inventor has been organized in such a manner that it comprises a master oscillator, 12 master frequency dividers which divide the frequency of the master oscillator and produce 12 tones corresponding toC,C#,,D,D# ,E,F,F#,G,G#,A,A#,and B in the highest octave in the musical instrument, and a number of A frequency dividers each dividing a frequency of one of the 12 tones in a preceding octave into a corresponding tone of the subsequent octave.
  • the frequencydividing factors (ratios) of the master frequency dividers should be integers, errors to some extent have always accompanied the resultant tones thus obtained, although the frequency of the oscillation in the master oscillator is selected to be a value considerably higher than the tone frequencies. Whenever it is desired that the frequency errors be reduced substantially, the frequency of the master oscillator and accordingly the frequency dividing factors of the master frequency dividers must be selected'to be of considerably greater numbers. Such an organization of the tone generator would be exessively complicated.
  • SUMMARY OF THE INVENTION primary object of the present invention is to provide a novel tone generator suitable for use in an electronic musical instrument, wherein the above described drawbacks of the heretofore proposed tone generator can be substantially eliminated.
  • Another object of the invention is to provide a novel tone generator wherein the frequency errors in the resultant tones can be substantially reduced.
  • Still another object of the invention is to provide a novel tone generator suitable for use in an electronic and a plurality of master frequency divider s corre- .sponding respectively to required notes in an octave, whereby the output frequency of the first oscillator is imparted to a first plurality of the master frequency dividers corresponding respectively to every other note along the chromatic scale in an octave, and the output frequency of the second oscillator is imparted to a second plurality of the master frequency dividers corresponding respectively to the remainder of the notes in the octave.
  • FIG. 2 is a block diagram showing a tone generator according to the present invention employed in an electronic musical instrument.
  • frequency errors of more than 3 cents can be heard by ear, and hence it is desirable that these errors be further reduced to less than 3 cents. But, if it is desired that the frequency errors be reduced substantially, the frequency of the master oscillator and accordingly the frequency dividingfactors of the master frequency dividers must be selected to be of considerably greater numbers. Such an organization of the 'tone generator would be exessively complicated.
  • FIG. 2 there is indicated an example of a tone generator according to the present invention.
  • two master oscillators 6 and 7 are provided for the twelve master frequency-dividers SC, SC D, 5D 5E, SF, SF# 5G, 5G 5A, 5A and 5B, and one of the master oscillators, for instance, 6, is connected to every other master frequency divider, for example 5C, SD, 5E, 5F 5G and 5A while the other master oscillator 7 is connected to 4 taining 31'1'12' notesiifilie case of Table 3 are equal to or less than the frequency dividing factors in the case of Table 2, whereby the required number of circuit components in this invention is much reduced from that required in the heretofore proposed device.
  • the frequency dividing factors of the first group of the master frequency dividers are equal to the frequency dividing factors of the second group of the master frequency dividers, whereby each of the master frequency dividers in the first group can be interchanged with the corresponding one of thesec- 0nd group of the master frequency dividers, and the design and the production of these master frequency dividers can be simplified remarkably.
  • a tone generator for electronic musical instrurngiggomprising first and second master oscillato rsol TABLE 3 Note 0 or; D D4; E r F F4; G or; A Al: B
  • Dividing factor 43s 438 391 391 34s 34s are 310 276 210 24s 246 Frequency 31. 4186.0 4435.0 4689.2 4968.1 5203.0 5582.0 5914.4 6266.2 6643.0 7038.2 1453.1 7896.5 Error (cents) 0 0 0.91 -0.01 1.73 1.73 V -1.50 -1.50 0.47 -o.41 -1.20 -1.20
  • the frequency dividing factors for the first-group of the master frequency dividers 5C, SD, 5E, 5F 5G and 5A and the frequency dividing factors for the second group of the master frequency dividers 5C 5D 5F, 50, 5A, and 5B are selected to be identical, respectively ranging from 438 to 246.
  • the errors of the individual notes from the desired frequencies shown in Table 1 can be greatly reduced as will be apparent when the values shown in Table 2 is compared with those in Table 3, falling within a range of from 0 to --l .73 cents, whereby the width of the frequency er-, rors as awhole becomes 1.73 cents.
  • the frequency errors of the individual notes obtained from the tone generator according to this invention which is shown in FIG. 2 are substantially reduced from the values for the same notes obtained from the heretofore proposed tone generator as shown in FIG. 1.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Electrophonic Musical Instruments (AREA)
US00230588A 1971-03-06 1972-03-01 Electronic musical instruments with two master oscillators Expired - Lifetime US3795754A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1971014335U JPS5033157Y2 (enrdf_load_stackoverflow) 1971-03-06 1971-03-06

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US3795754A true US3795754A (en) 1974-03-05

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US (1) US3795754A (enrdf_load_stackoverflow)
JP (1) JPS5033157Y2 (enrdf_load_stackoverflow)
DE (1) DE2210233A1 (enrdf_load_stackoverflow)
GB (1) GB1361746A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4173163A (en) * 1977-07-08 1979-11-06 Kimball International, Inc. Tone generator for electronic organ
US4242935A (en) * 1977-08-25 1981-01-06 Peterson Richard H Musical tone generator system using multiple frequency synthesizers
US4332181A (en) * 1976-12-24 1982-06-01 Casio Computer, Co., Ltd. Electronic musical instrument with means for selecting tone clock numbers
US4434696A (en) 1981-11-20 1984-03-06 Harry Conviser Instrument for comparing equal temperament and just intonation

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3236931A (en) * 1960-01-15 1966-02-22 Academy Of Aeronautics Electronic musical instrument
US3490327A (en) * 1966-08-26 1970-01-20 Excelsior Accordians Inc Multivibrator frequency divider chain for musical instrument employing a master oscillator which is step frequency adjustable and a twin-t vibrato oscillator
US3509454A (en) * 1964-10-28 1970-04-28 Philips Corp Apparatus for tuning musical instruments
US3520982A (en) * 1966-06-30 1970-07-21 Philips Corp Method and a device for generating an equal-tempered tone scale in musical instruments
US3590131A (en) * 1969-02-11 1971-06-29 Robert R Reyers Electronic musical scale generator employing a single master oscillator
US3601518A (en) * 1969-10-06 1971-08-24 Charles M Hill Musical instrument and method employing reference frequency source and controlled period multipliers therefor
US3617901A (en) * 1967-08-15 1971-11-02 Philips Corp Method of producing tones of an equally tempered scale
US3639853A (en) * 1970-03-27 1972-02-01 Tadao Sakai Tone oscillator for an electronic musical instrument
US3702370A (en) * 1971-05-19 1972-11-07 John Ray Hallman Jr Digital tone generator system for electronic organ employing a single master oscillator

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3236931A (en) * 1960-01-15 1966-02-22 Academy Of Aeronautics Electronic musical instrument
US3509454A (en) * 1964-10-28 1970-04-28 Philips Corp Apparatus for tuning musical instruments
US3520982A (en) * 1966-06-30 1970-07-21 Philips Corp Method and a device for generating an equal-tempered tone scale in musical instruments
US3490327A (en) * 1966-08-26 1970-01-20 Excelsior Accordians Inc Multivibrator frequency divider chain for musical instrument employing a master oscillator which is step frequency adjustable and a twin-t vibrato oscillator
US3617901A (en) * 1967-08-15 1971-11-02 Philips Corp Method of producing tones of an equally tempered scale
US3590131A (en) * 1969-02-11 1971-06-29 Robert R Reyers Electronic musical scale generator employing a single master oscillator
US3601518A (en) * 1969-10-06 1971-08-24 Charles M Hill Musical instrument and method employing reference frequency source and controlled period multipliers therefor
US3639853A (en) * 1970-03-27 1972-02-01 Tadao Sakai Tone oscillator for an electronic musical instrument
US3702370A (en) * 1971-05-19 1972-11-07 John Ray Hallman Jr Digital tone generator system for electronic organ employing a single master oscillator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4332181A (en) * 1976-12-24 1982-06-01 Casio Computer, Co., Ltd. Electronic musical instrument with means for selecting tone clock numbers
US4173163A (en) * 1977-07-08 1979-11-06 Kimball International, Inc. Tone generator for electronic organ
US4242935A (en) * 1977-08-25 1981-01-06 Peterson Richard H Musical tone generator system using multiple frequency synthesizers
US4434696A (en) 1981-11-20 1984-03-06 Harry Conviser Instrument for comparing equal temperament and just intonation

Also Published As

Publication number Publication date
JPS5033157Y2 (enrdf_load_stackoverflow) 1975-09-27
JPS4711224U (enrdf_load_stackoverflow) 1972-10-11
DE2210233A1 (de) 1972-09-14
GB1361746A (en) 1974-07-30

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