GB1088131A - A circuit arrangement for the periodic and/or non-periodic modification of the spectrum of audio frequency signals - Google Patents

A circuit arrangement for the periodic and/or non-periodic modification of the spectrum of audio frequency signals

Info

Publication number
GB1088131A
GB1088131A GB685665A GB685665A GB1088131A GB 1088131 A GB1088131 A GB 1088131A GB 685665 A GB685665 A GB 685665A GB 685665 A GB685665 A GB 685665A GB 1088131 A GB1088131 A GB 1088131A
Authority
GB
United Kingdom
Prior art keywords
photo
periodic
signals
controlled
resistors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB685665A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Matth Hohner AG
Original Assignee
Matth Hohner AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matth Hohner AG filed Critical Matth Hohner AG
Publication of GB1088131A publication Critical patent/GB1088131A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
    • H03G1/0047—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using photo-electric elements
    • 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
    • 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
    • G10H1/06—Circuits for establishing the harmonic content of tones, or other arrangements for changing the tone colour
    • G10H1/12—Circuits for establishing the harmonic content of tones, or other arrangements for changing the tone colour by filtering complex waveforms

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

1,088,131. Photo-electric modification of electrical signals. MATTH. HOHNER A. G. Feb.17, 1965 [Feb. 18, 1964], No. 6856/65. Heading G1A. [Also in Divisions G5 and H3] The spectrum of audio-frequency signals, particularly in an electronic musical instrument, is modified by a filter including a photo-sensitive element the electrical properties of which are controlled by a co-operating light source. The filter may be a passive network, Fig. 4 (not shown) comprising a high pass branch 151, 154 and 157 and a low pass branch 152, 155 and 158. The photo-sensitive resistors 151, 152 are controlled by a light source 153 or a plurality of light sources or shutters. In the embodiments of Figs. 1, 2, 3 and 5 (not shown) valve or transistor amplifiers are provided with negative feedback connections comprising tuned circuits including photo-resistors whose resistances and hence the characteristics of the feedback connections are controlled by one or more lamps or shutters. The lamps may be in an oscillator or multi-vibrator circuit (Figs. 1 and 5) to give a periodic modulation to the audio signals, or pulsed by discharge of a capacitor (Fig. 3) to give an exponential attack or decay. Frequency independent modifications to the signals may also be made by means of further photo-resistors 88 and 89, Fig. 2, illuminated through a grey wedge 94 to effect a volume control and photo-resistor 86 illuminated through an oscillating grey wedge 95 to produce an amplitude vibrato or tremolo effect.
GB685665A 1964-02-18 1965-02-17 A circuit arrangement for the periodic and/or non-periodic modification of the spectrum of audio frequency signals Expired GB1088131A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH0051761 1964-02-18

Publications (1)

Publication Number Publication Date
GB1088131A true GB1088131A (en) 1967-10-25

Family

ID=7157818

Family Applications (1)

Application Number Title Priority Date Filing Date
GB685665A Expired GB1088131A (en) 1964-02-18 1965-02-17 A circuit arrangement for the periodic and/or non-periodic modification of the spectrum of audio frequency signals

Country Status (2)

Country Link
DE (1) DE1191670C2 (en)
GB (1) GB1088131A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3528040A (en) * 1968-12-12 1970-09-08 Aerospace Res Electronically variable filter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866505A (en) * 1972-07-20 1975-02-18 Nippon Musical Instruments Mfg Ensemble effect imparting device using a bucket brigade device for an electric musical instrument

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3528040A (en) * 1968-12-12 1970-09-08 Aerospace Res Electronically variable filter

Also Published As

Publication number Publication date
DE1191670C2 (en) 1973-10-31
DE1191670B (en) 1973-04-05

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