EP0366442A2 - Drahtloser Funkfrequenzsender - Google Patents

Drahtloser Funkfrequenzsender Download PDF

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Publication number
EP0366442A2
EP0366442A2 EP89310995A EP89310995A EP0366442A2 EP 0366442 A2 EP0366442 A2 EP 0366442A2 EP 89310995 A EP89310995 A EP 89310995A EP 89310995 A EP89310995 A EP 89310995A EP 0366442 A2 EP0366442 A2 EP 0366442A2
Authority
EP
European Patent Office
Prior art keywords
circuitry
transmitter
plug
housing
unit
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.)
Withdrawn
Application number
EP89310995A
Other languages
English (en)
French (fr)
Other versions
EP0366442A3 (de
Inventor
Richard Lloyd Davis
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.)
Airjack Wireless Systems Inc
Original Assignee
Airjack Wireless Systems Inc
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 Airjack Wireless Systems Inc filed Critical Airjack Wireless Systems Inc
Publication of EP0366442A2 publication Critical patent/EP0366442A2/de
Publication of EP0366442A3 publication Critical patent/EP0366442A3/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • G10H3/00—Instruments in which the tones are generated by electromechanical means
    • G10H3/12—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument
    • G10H3/14—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means
    • G10H3/18—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means using a string, e.g. electric guitar
    • 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
    • G10H1/0033—Recording/reproducing or transmission of music for electrophonic musical instruments
    • G10H1/0083—Recording/reproducing or transmission of music for electrophonic musical instruments using wireless transmission, e.g. radio, light, infrared
    • 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
    • G10H2240/00—Data organisation or data communication aspects, specifically adapted for electrophonic musical tools or instruments
    • G10H2240/171—Transmission of musical instrument data, control or status information; Transmission, remote access or control of music data for electrophonic musical instruments
    • G10H2240/201—Physical layer or hardware aspects of transmission to or from an electrophonic musical instrument, e.g. voltage levels, bit streams, code words or symbols over a physical link connecting network nodes or instruments
    • G10H2240/211—Wireless transmission, e.g. of music parameters or control data by radio, infrared or ultrasound

Definitions

  • Electric guitars in common use must be connected into special amplifiers by wire. As such amplifiers usually require household AC current, they cannot be readily taken to places where AC current is not available such as beaches, parks or roadside rest stops, for example. Even if a guitar amplifier could operate by battery power, it would be inconvenient to carry it to a beach or park as well as a portable radio ( a radio is standard equipment for beach-goers). A guitar adapted to transmit over FM would reduce the need to carry special guitar amplifiers.
  • Portable FM radio's are generally more convenient to transport than guitar amps, and are, in many cases, installed in automobiles. Although some prior art guitars have built-in amplifiers and speakers, such as the guitar of U.S. Patent 3,781,451, these are special devices as opposed to an add-on component which can be used with a favorite old guitar.
  • a transmitter unit for use with a stringed musical instrument having a transducer electrically connected to an output jack, said unit comprising transmitter circuitry; a coil of wire or other conductive means connected to said circuitry and adapted to induce a RF pattern with the strings of said musical instrument, the combination of said coil or other conductive means and said strings acting as an antenna when the unit is in use; a phono plug adapted to be inserted into said output jack, to provide an input to said circuitry from said transducer and to connect said strings to a ground of said circuitry, said plug extending from said housing, said housing being adapted to be held in place on said instrument by said plug; power supply means for providing power to said circuitry.
  • the preferred embodiment of the present invention is designed to allow musicians to play an electric guitar or other stringed instrument having a transducer and an output jack, and have it received by any nearby FM radio or FM stereo receiver, without any electrical cord being required to connect the guitar to the radio or receiver.
  • a wireless system is provided that is fully tunable over the entire FM broadcast band.
  • the device is a compact transmitter which does not incorporate or require any cumbersome external antenna.
  • the device of the preferred embodiment is also a structurally self-supporting transmitter which is readily detachable from and easily attachable to any standard unmodified electric guitar or other similar stringed instrument having a transducer electrically connected to an output jack.
  • FIG. 1 the physical layout of the preferred embodiment can be seen.
  • the complete unit is very compact, being about the size of an egg, and remains generally stationary on the guitar, when inserted, as it plugs directly into the electric guitar's input receptacle. It is therefore not necessary to have the transmitting portion of the device attached to the musician's belt or guitar strap; or to have it attached to the musician's person in any fashion.
  • the power switch means for the unit is somewhat unique in that it has been incorporated in the modified 1/4" phono plug 19.
  • the plug 19 comprises an upper base portion 14, a first insulating spacer 16, a lower base portion 18, a second insulating spacer 20, and a lower plug segment 22.
  • the batteries 30 are electrically connected to the circuitry 32, which is then energized as will later be explained in more detail. Removal of the unit form the guitar will effectively turn off the power to the circuit 32 for increased battery life.
  • the threads 42 of the device allow for the removal of the non-conductive upper casing 10, for easy replacement of batteries 30 which are of the small coin lithium type.
  • Upper circuit board 32 and associated components are physically attached to non-conductive upper casing 10.
  • Plug 19 and associated components are physically attached to non-conductive lower casing 12.
  • Modification of the 1/4" phono plug 19 for use as a switch has been accomplished by splitting the base portion of plug 19 into two separate portions 14 and 18, and electrically separating them by an insulating spacer 16.
  • the spacer 16 is constructed of a non-conductive material such as plastic.
  • Upper base portion 14 is electrically connected to the negative terminal of batteries 30 placed in series, while the lower base portion 18 is connected to one of the small spring connector pins 38.
  • the other spring connector pin 39 is connected to lower plug segment 22, which allows the pick-up of the guitar to be connected to the circuit, thus providing audio input to the device.
  • These connections to plug segments are made via internal plug connectors 24.
  • the plug base portions 14 and 18 have been separated by first insulating spacer 16 at an angle, as seen in FIG. 1, so that the unit will work effectively in different types of guitars, some of which have input receptacles differing from standard depth to provide proper connection of the two segments when the device is in use.
  • the positive terminal of batteries 30 placed in series is connected to the unit's circuitry via upper battery connector 36.
  • the batteries 30 are insulated from spring connector pins 38 and 39 by way of a plastic sleeve (not shown) which can be attached to the upper surface of lower circuit board 26, or to the lower surface of upper circuit board 32.
  • the transmitting frequency of the device can be adjusted to any frequency in the FM broadcast band (88 to 108 MHz) by adjusting a small ferrite core in tuning inductor 34, which forms a part of the circuit of upper circuit board 32, via tuning aperture 51 located at the top of upper casing 10.
  • a small input capacitor C1 (see FIG. 2) is located interior to lower casing 12 (FIG. 1). Referring to FIG. 1, when the unit is manufactured areas surrounding internal plug connectors 24 and tuning inductor 34 are filled with a non-conductive resinous material for stability and durability.
  • FIG. 2 a circuit diagram of the transmitter can be seen.
  • the electronic circuit of the unit is based on a modified version of a Colpitts oscillator.
  • the resultant transmitting range of the device is very high, in the order of 100 feet, and the signal is remarkably strong and stable.
  • the effective antenna remains stationary relative to the guitar for stability of signal, which could be affected by movement or changes in static capacitance or inductance between a movable cord, wire or external antenna and a musician, if a cord, wire or external antenna were used.
  • the circuitry does not require any audio preamplification stages as the change in current produced by the change of impedance of the guitar's own transducer adequately modulates, by impedance, the basic RF carrier of the oscillator.
  • the upper and lower casings 10 and 12 of the unit are produced form plastic or any appropriate material. It is in this housing that all components of the circuit, circuit boards 26 and 32, batteries 30 and connectors 24, 28, 36, 39 and wire coil 50 (see FIG. 2) which acts in co-relation with the guitar strings are contained.
  • the only part external to the casings is the modified 1/4" phono jack 19 (see FIG. 1) which emanates from the base of the lower casing 12 and which plugs directly into the guitar when the unit is to be used.
  • an appropriate voltage for series batteries 30 would be 6 volts DC.
  • R1 and R2 would be 47K ohms and 470 ohms, respectively; these values have been determined to be of an appropriate ratio to properly bias the particular transistor used, and to allow low power consumption.
  • Appropriate values for C2, C3 and C4 would be 0.001 Mfd, 4.7 pf, and 4.7 pf, respectively; an appropriate value of filter capacitor C1 would be found in the range of 1 to 10 Mfd; an appropriate tuning inductor 34 would be adjustable to 10mH; and an appropriate transistor Q1 would be a Sylvania type ECG 107, npn Si VHF, IF, RF, Amp, OFC transistor.
  • resistors R1 and R2 could be varied, and the transistor used could be changed, as long as the resistor values are chosen to properly bias the particular transistor used.
  • the values of C3 and C4 could be varied; however, this may result in the unit being tunable over only part of the FM band.
  • a Hartley oscillator could be substituted for the Colpitts oscillator, in fact any appropriate RF oscillator could be used.
  • the coiled length of wire 50 (see FIG. 2) could be replaced with a metallic coating of the interior or exterior of the upper or lower casing 10 or 12. Although stability is maintained when such a coating is used, range is significantly reduced.
  • FIG. 3 illustrates a further embodiment of the present invention which shows further modification to the basic circuitry of the invention to allow the device to be used in other applications, such as, for example, with the use of electronic keyboards, video cassette records (VCRs), etc. to eliminate the need for electrical wiring between transmitter and receiver. It is seen that the modifications shown in FIG. 3 do not depart from the original concept of the invention.
  • FIG. 3 which illustrates both the audio frequency (AF) section and radio frequency (RF) section of the transmitter device
  • components R5 and R6 and capacitor C6 have been added to eliminate distortion of the transmitted signal.
  • the values of the existing components including R3 and R4 have been modified to change the AF section input sensitivity level.
  • a power supply 60 in the form of a 6 volt battery has been included and R2 has been changed from 470 ohms to 1 K ohms to conserve battery consumption. It is seen that all other components within the RF section remain the same as those illustrated in FIG. 2.
  • the length of wire 50 as illustrated in FIG. 2 is not required in applications requiring short range transmission since R.F. radiation from the RF section of the transmitter device itself is sufficient for transmission to the FM receiver.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Circuits Of Receivers In General (AREA)
  • Structure Of Receivers (AREA)
  • Transmitters (AREA)
EP89310995A 1988-10-27 1989-10-25 Drahtloser Funkfrequenzsender Withdrawn EP0366442A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA000581425A CA1283458C (en) 1988-10-27 1988-10-27 Cordless guitar transmitter
CA581425 1988-10-27

Publications (2)

Publication Number Publication Date
EP0366442A2 true EP0366442A2 (de) 1990-05-02
EP0366442A3 EP0366442A3 (de) 1990-08-16

Family

ID=4138981

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89310995A Withdrawn EP0366442A3 (de) 1988-10-27 1989-10-25 Drahtloser Funkfrequenzsender

Country Status (2)

Country Link
EP (1) EP0366442A3 (de)
CA (1) CA1283458C (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2236643A (en) * 1989-09-28 1991-04-10 Dudley Lloyd Rumfitt Radio transmitter for musical instruments
GB2374973A (en) * 2001-01-27 2002-10-30 Opcon Ltd Multipurpose keyboard with strap
DE102008044727A1 (de) * 2008-08-28 2010-03-04 Sennheiser Electronic Gmbh & Co. Kg Drahtlos-Taschensender und Kapazitätseinstelleinheit
GB2477634A (en) * 2010-02-04 2011-08-10 John Crawford Audio interface device
US9699578B2 (en) 2011-08-05 2017-07-04 Ingenious Audio Limited Audio interface device
USD831101S1 (en) * 2016-05-06 2018-10-16 Shenzhen Fzone Technology Co., ltd. Wireless guitar transmitter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD960085S1 (en) 2020-03-03 2022-08-09 Fk Irons Inc. Tattoo machine battery power supply

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1413103A (fr) * 1964-05-19 1965-10-08 Dispositif électronique à un seul transistor destiné à transmettre le son des cordes d'une guitare à un poste récepteur
US3662223A (en) * 1971-07-02 1972-05-09 Walter L Marshall Pre-amplifier plug for musical instruments with battery retaining and switch activating rod means
DE2200891A1 (de) * 1972-01-08 1973-07-12 Sennheiser Electronic Musikinstrument zum anschluss an elektroakustische uebertragungsanlagen
US4186641A (en) * 1978-06-22 1980-02-05 Carnival Toys, Inc. Wireless toy musical instrument

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1413103A (fr) * 1964-05-19 1965-10-08 Dispositif électronique à un seul transistor destiné à transmettre le son des cordes d'une guitare à un poste récepteur
US3662223A (en) * 1971-07-02 1972-05-09 Walter L Marshall Pre-amplifier plug for musical instruments with battery retaining and switch activating rod means
DE2200891A1 (de) * 1972-01-08 1973-07-12 Sennheiser Electronic Musikinstrument zum anschluss an elektroakustische uebertragungsanlagen
US4186641A (en) * 1978-06-22 1980-02-05 Carnival Toys, Inc. Wireless toy musical instrument

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2236643A (en) * 1989-09-28 1991-04-10 Dudley Lloyd Rumfitt Radio transmitter for musical instruments
GB2374973A (en) * 2001-01-27 2002-10-30 Opcon Ltd Multipurpose keyboard with strap
DE102008044727A1 (de) * 2008-08-28 2010-03-04 Sennheiser Electronic Gmbh & Co. Kg Drahtlos-Taschensender und Kapazitätseinstelleinheit
GB2477634A (en) * 2010-02-04 2011-08-10 John Crawford Audio interface device
US9699578B2 (en) 2011-08-05 2017-07-04 Ingenious Audio Limited Audio interface device
USD831101S1 (en) * 2016-05-06 2018-10-16 Shenzhen Fzone Technology Co., ltd. Wireless guitar transmitter

Also Published As

Publication number Publication date
CA1283458C (en) 1991-04-23
EP0366442A3 (de) 1990-08-16

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