US3735013A - System for producing an aperiodic vibrato signal - Google Patents

System for producing an aperiodic vibrato signal Download PDF

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Publication number
US3735013A
US3735013A US00182068A US3735013DA US3735013A US 3735013 A US3735013 A US 3735013A US 00182068 A US00182068 A US 00182068A US 3735013D A US3735013D A US 3735013DA US 3735013 A US3735013 A US 3735013A
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United States
Prior art keywords
divider
signal
frequency
output
gate circuit
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Expired - Lifetime
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US00182068A
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English (en)
Inventor
Der Peet C Van
C Mulkens
W Ruiterkamp
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US Philips Corp
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US Philips Corp
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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
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/02—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos
    • G10H1/04—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos by additional modulation
    • G10H1/043—Continuous modulation

Definitions

  • ..G10h 1/02 dissonant signals are applied to a control input of each [58] Fleld of Search ..84/l.24, 1.25, DIG, 4, tone generator via a gate circuit a divider chain and a 84/D1G. 10, DIG. 11, 1.01, 1.03; 331/106, low pass filten 4 Claims, 2 Drawing Figures SYSTEM FOR PRODUCING AN APERIODIC VIBRATO SIGNAL
  • the invention relates to a system for producing a vibrato signal which varies in frequency in a manner uncorrelated with time, in an electronic musical instrument provided with at least one tone generator.
  • At least one gate circuit having inputs which are connected, as the case may be, through a pulse shaper, to at least two sources of signals which preferably form a discord within an octave, a control input of each tone generator being coupled to an input of one of the gate circuits via at least one divider-by-two chain.
  • a signal which consists of pulses of continuously varying width, which are spaced by intervals which differ from one another in a manner such that the mean pulse duration is one half of the mean period.
  • the combination of the signals applied to the gate circuit is chosen so that the mean period of the signal at the output of the last divid er-by-two chain or at the outputs of the last divider-bytwo chains correspond to the period of the signals usually employed for the vibrato.
  • each last divider-by-two chain is followed by a low-pass filter having a cut-off frequency of a value between one and four times the reciprocal of the mean period of the signal at the output of the last divider-bytwo chain, there will appear at the output of this filter, a low-frequency signal which has the nature of band noise.
  • the frequency of this generator can be varied statistically about its mean value, so that the sound from this generator will assume the nature of a wind instrument, such as a flute, an organ-pipe, etc.
  • each of the signals applied to a gate circuit consists of one of the tone signals produced in the instrument.
  • a particularly advantageous embodiment of a system according to the invention includes a gate circuit which is connected to the control inputs of all the tone generators via each divider-by-two chain and via the lowpass filter, if provided.
  • control input of a tone generator is used in this specification to mean an input to which the application of a signal of varying magnitude results in a frequency variation of the tone generator. This includes, for example, that part of the supply circuit of which the output voltage feeds the generators.
  • the output voltage may be varied by means of the signal from the gate circuit, so that the frequencies of the generators vary.
  • FIG. 1 is a circuit diagram of a system according to the invention using four gate circuits
  • FIG. 2 is a circuit diagram of a system using one gate circuit.
  • l2 tone generators G G are each connected to a divider-by-two chain D D in each of which chains the frequency of the tone of the associated generator is divided by a factor of 2, so that at the outputs of these divider chains, the lower octave tones are available.
  • the system includes four gate circuits P R, which each have three inputs which each are connected to an output of one of the divider chains D D if required, i.e. if the signals at the output of the divider are not sufficiently pulseshaped, through a pulse shaper I, I, respectively.
  • divider chains D D four groups are formed each consisting of three divider Chains b 2 3; 4, 5 6; 1 8, 9; 10 11 12) whereby the tones at the respective outputs of these divider chains form dissonant intervals of a minor second, so that the gate circuit P is connected to the divider chains D D and D the gate circuit P is connected to the divider chains D D and D etc.
  • the outputs of the gate circuits P P are each connected to a second divider chain B B, which each comprise at least one divider-by-two stage, with the result that at the output of each of these divider chains B B, a pulsatory voltage appears, the mean period of which, corresponds to the period of a signal usually employed for producing a vibrato.
  • each of the divider chains B B is connected to a low-pass filter F F respectively, having a cut-off frequency which is between one and four times the reciprocal of the mean period of the signal at the output of the respective divider chain B B
  • the pulsatory signal would cause the generator frequency at the output of the respective divider chain B B to be aperiodically and abruptly shifted, from the minimum frequency to the maximum frequency, whereas now the integrating nature of the low-pass filter F F causes the frequency to vary more gradually.
  • each filter F F is, respectively applied to the control input of one of the four sets of three generators G G and G G G and G respectively, so that the frequency of these generators varies in a manner uncorrelated with time.
  • the outputs of the low-pass filters F F need not necessarily be connected each to the associated set of generators G,, G and G G G and G but may alternatively be connected to any other set of three generators.
  • a different number of gate circuits may be used which each have at least two inputs, provided that each generator is connected to an output of a filter.
  • FIG. 2 shows a particularly advantageous circuit arrangement in which only one gate circuit P is used which has 12 inputs which each are connected to one of the outputs of one of the 12 divider chains D D
  • the output of the gate circuit P here also is connected to a divider chain B the output of which is connected to a low-pass filter F.
  • the output of the low-pass filter F is connected to the control inputs of all twelve generators G G
  • This circuit arrangement provides highly satisfactory results if the frequencies of the signals applied to the gate circuits lie between 1,000 Hz and 2,000 Hz, and if the divider stages B 3., again divide these frequencies by a factor of, for example, 16.
  • the cut-off frequency of each of the low-pass filters F E has been chosen to be about 15 Hz.
  • the output of the low-pass filter F must be connected to the control input of this one generator only.
  • the number of signals applied to the gate circuit, the frequency range from which these signals are taken, and the number of divider-by-two chains at the output of each gate circuit, together determine the mean period, the pitch range, and the repetition rate of the vibrato signal.
  • a system for producing a vibrato signal which varies in frequency in a manner uncorrelated with time in an electronic musical instrument comprising:
  • a divider stage connected to said gate circuit at an output thereof;
  • a low pass filter connected between the divider stage and each control input of said tone generators; and divider chains connected between said tone generators and said pulse shapers.
  • the low pass filter has a cut-off frequency lying between approximately one and four times a reciprocal of a mean period of a signal appearing at an output of the divider stage.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Electrophonic Musical Instruments (AREA)
US00182068A 1970-09-22 1971-09-20 System for producing an aperiodic vibrato signal Expired - Lifetime US3735013A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7013955.A NL157728B (nl) 1970-09-22 1970-09-22 Inrichting voor opwekken van een aperiodisch vibratosignaal, alsmede elektronisch muziekinstrument, daarvan voorzien.

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US3735013A true US3735013A (en) 1973-05-22

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US00182068A Expired - Lifetime US3735013A (en) 1970-09-22 1971-09-20 System for producing an aperiodic vibrato signal

Country Status (11)

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US (1) US3735013A (xx)
JP (1) JPS527931B1 (xx)
AU (1) AU468074B2 (xx)
BE (1) BE772833A (xx)
CA (1) CA953136A (xx)
DE (1) DE2148074C3 (xx)
ES (1) ES395238A1 (xx)
FR (1) FR2108398A5 (xx)
GB (1) GB1304492A (xx)
IT (1) IT939825B (xx)
NL (1) NL157728B (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4142434A (en) * 1974-07-23 1979-03-06 U.S. Philips Corporation Circuit arrangement for electronic musical instruments

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2292457A1 (fr) * 1974-11-28 1976-06-25 Guiset Jacques Instrument chirurgical de diagnostic par ultra-sons et d'intervention simultanee
JPS54119236U (xx) * 1978-02-10 1979-08-21

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2322884A (en) * 1941-04-26 1943-06-29 Bell Telephone Labor Inc Amplifying system
US2697959A (en) * 1951-11-23 1954-12-28 Conn Ltd C G Apparatus for producing complex waves at a desired frequency
US3157725A (en) * 1961-06-01 1964-11-17 Baldwin Co D H System for processing musical spectra
US3267199A (en) * 1964-03-04 1966-08-16 Hurvitz Hyman Systems for introducing vibrato
US3440325A (en) * 1964-01-27 1969-04-22 Wurlitzer Co Transistorized hartley oscillator tone generator circuit producing glissando and vibrato effects by voltage detuning
US3479440A (en) * 1966-08-15 1969-11-18 Baldwin Co D H Randomly-perturbed,locked-wave generator
US3701040A (en) * 1971-01-11 1972-10-24 Hammond Corp Electronic musical instrument master oscillator with provision for frequency control

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2322884A (en) * 1941-04-26 1943-06-29 Bell Telephone Labor Inc Amplifying system
US2697959A (en) * 1951-11-23 1954-12-28 Conn Ltd C G Apparatus for producing complex waves at a desired frequency
US3157725A (en) * 1961-06-01 1964-11-17 Baldwin Co D H System for processing musical spectra
US3440325A (en) * 1964-01-27 1969-04-22 Wurlitzer Co Transistorized hartley oscillator tone generator circuit producing glissando and vibrato effects by voltage detuning
US3267199A (en) * 1964-03-04 1966-08-16 Hurvitz Hyman Systems for introducing vibrato
US3479440A (en) * 1966-08-15 1969-11-18 Baldwin Co D H Randomly-perturbed,locked-wave generator
US3701040A (en) * 1971-01-11 1972-10-24 Hammond Corp Electronic musical instrument master oscillator with provision for frequency control

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4142434A (en) * 1974-07-23 1979-03-06 U.S. Philips Corporation Circuit arrangement for electronic musical instruments

Also Published As

Publication number Publication date
AU3367571A (en) 1973-03-29
NL7013955A (xx) 1972-03-24
DE2148074C3 (de) 1980-09-25
DE2148074B2 (de) 1980-01-24
NL157728B (nl) 1978-08-15
JPS527931B1 (xx) 1977-03-05
CA953136A (en) 1974-08-20
FR2108398A5 (xx) 1972-05-19
AU468074B2 (en) 1975-12-18
DE2148074A1 (de) 1972-03-30
IT939825B (it) 1973-02-10
ES395238A1 (es) 1974-11-01
GB1304492A (xx) 1973-01-24
BE772833A (fr) 1972-03-20

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