US3609202A - Electronic organ gating system - Google Patents
Electronic organ gating system Download PDFInfo
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- US3609202A US3609202A US541380A US3609202DA US3609202A US 3609202 A US3609202 A US 3609202A US 541380 A US541380 A US 541380A US 3609202D A US3609202D A US 3609202DA US 3609202 A US3609202 A US 3609202A
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- gate
- keying
- diode
- tone signal
- source
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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
- G10H1/18—Selecting circuits
Definitions
- FIGA E "C I I0 BY fiuuam ELECTRONIC ORGAN GATING SYSTEM This application pertains to electronic musical instruments and, in particular, concerns a improved keying system for electronic organs and the like.
- each of the gates in its nonconductive condition passes some of the output to the oscillator and for two, three or more such gates the oscillator may provide audible output at a sufficient level to be disturbing to the sensitive ear, because each gate contributes some feed-through signal.
- a diode additional to those in the gates is provided in association with each oscillator, but not each gate.
- the additional diode pertaining to an oscillator is gated on when any gate associated with that oscillator is gated on. While the oscillator output is not being gated through leakage therefrom is thus reduced. When the oscillator output is being gated through, any leakage therefrom which may eitist is audibly lost in the intentionally gated through tone.
- Another important object of the invention is to obviate the use of variable'resistance key switches in keying circuits for electronic organs.
- FIG. 1 is a block diagram of an organ gating system according to the invention
- FIG. 2 is a schematic circuit diagram of a portion of the system of FIG. 1;
- FIG. 3 is a schematic circuit diagram of a modification of the circuit of FIG. 2;
- FIG. 4 is a schematic circuit diagram of a modification of the gating circuitry of FIG. 1, capable of inclusion in the system of FIG. 1 in substitution of the gating circuit there employed;
- FIG. 5 is a schematic circuit diagram of a modification of the system of FIG. 4.
- each tone generator of an organ is connected in series with a first gate, which is normally maintained nonconductive.
- the first gate proceeds to several parallel second gates, which are rendered conductive individually at will on closure of key switches, which selectively apply DC on gating voltage to the gates. Any one of the parallel second gates which is rendered conductive conveys its DC gating voltage to its associated first gate, rendering the latter conductive of the tone signal.
- each tone generator provides a tone to a load via a first gate, and any one of several second gates, the latter being in parallel with each other, but all in series with the first gate.
- the first gate is thus also rendered conductive.
- Feedthrough from the generator to its ultimate load, a loudspeaker, is thereby minimized when all the associated second gates are nonconductive.
- any of the second gates is rendered conductive, so that the associated tone is heard, some fcedthrough via the others of the second gates occurs, but is permissible since it is superposed on a tone having a compatible tone spectrum, or identical frequencies.
- a bypass impedance is connected to ground from each first gate, but not, unless desired, from the second gates.
- the bypass impedance has small impedance to ground for signal, relative to the nonconductive feed-through impedance of the first gate, but relatively large impedance ground for signal, relative to the conductive impedance of the first gate. Isolation at the first gate is thus enhanced, which minimizes total feedthrough with a minimum number of bypass impedances to ground, i.e. one for each tone source of an organ system rather than one for each gate.
- source C C,, C, and C represent selected exemplary sources from a rank of generators covering the usual several octaves of an electronic organ, C and C being an octave apart, and C, and C, being an octave apart. They are shown having a common connection to a circuit 10 which provides a grounded return path for the tone signals from an output system to be described.
- Tone signals from the sources mentioned are shown as passing to diodes 2, 4, 6 and 8, respectively, and thence to points ll, l2, l4 and 16, respectively, from which are shown two keying circuit paths for each source, comprising, in the case of the signal from source C,, one path consisting of series back-to-back diodes l8 and 20, with a common resistor 22 having a terminal connected to their junction, and a tone-envelope-shaping capacitor 24, connecting the other terminal of resistor 22 to ground.
- the gate comprising the elements 18, 20 and 22 is made effective by the key switch 26, passing direct current from a source 28 to the gate via a charging resistor 30, when key switch 26 is closed.
- the rate of buildup of the signal will be determined primarily by the time constant of the resistor 30 and capacitor 24.
- the decay envelope will be determined principally by the time constant of the resistance 22 and capacitor 24.
- Signal derived through the gate just mentioned may be collected in an 8' collector 32, the output of which may be passed through a tone color filter 34 by closure of the stop switch 36, or through another filter 38 through a stop switch 40.
- the outputs of filters 34, 38 may pass to an output system comprised of the usual amplifier 40 and loudspeaker system 42.
- addi tional filter circuits and stop switches may be used, if so desired.
- a second gate circuit comprising a charging resistor 46 for the envelope-shaping capacitor 48, connected through series resistor 50 to the diode portion of the gate, which is composed of series connected back-to-back diodes 52 and $4.
- This gate is connected to the collector 56 and to a tone color system comprised of filters 58 and 60, actuable by stop switches 62 and 64. Filters 58 and 60 in turn pass signal to the output system comprised of amplifier 40 and loudspeaker system 42.
- the signal for the gate comprised of diodes 52 and 54 derives from the source C by way of diode 6 and point 14.
- the circuits just described show how signals may be concurrently derived from two separate sources.
- more than one tone signal from the same source such as C, may be derived concurrently, for example, by way of switch 26 and a switch 66 which supplies direct current to resistor 68 from source 28.
- the keying voltage is supplied gradually to the capacitor 70 through the resistor 68 and is applied to the gate composed of diodes 72 and 74 by way of resistor 76.
- the signal appears in the collector 32 and may be heard in the output system, as desired, by a closure of stop switches, such as 36 and 40.
- the diode 6 is common to two key ing circuits, one comprised of diodes 52 and 54 and the other of diodes 72 and 74, and conducts when either of the keying circuits is conductive.
- a bypass impedance 78 which may be composed of a parallel combination of resistance and capacitance, (as in FIG. 2) is indicated generally at 78 for each signal path.
- This impedance is related to the other impedances of each circuit such that when, for example, the gate connected to the point 14 is nonconductive, the bypass impedance of 78 is relatively low with respect to the nonconductive impedance of the gate, but when the gate is conductive, the impedance of 78 is high with respect to the conductive impedance of the gate.
- a diode such as 6, and an associated shunt impedance 78 provide extra isolation and reduction of feed-through for both the gates comprised of diodes 72 and 74 and of the diodes 52 and 54.
- load or coupling resistors are shown at 80 and 82.
- the circuit element 78 is illustrated in FIG. 1 as an impedance.
- the function of impedance 78 is to provide a low bypass impedance when the gate is nonconductive, relative to the gate impedance, but to provide a relatively high impedance relative to gate impedance when the gate is conductive.
- the impedance 78 may take various forms, one of which is the parallel RC network of FIG. 2 and another of which is the capacitance 77 of FIG. 3, embodied in impedance 78'.
- the network of FIG. 2 is useful in enabling application of a bias, C to diode 8, which is not feasible in the circuit of FIG. 3. In either case the impedance values for the several gates must be properly selected, for the different frequencies of the several tone sources, to perform the required function in each case.
- a source 100 of musical tone signals is connected from ground to a first gating point 101, via a resistance 102.
- a diode 103 is connected between point 101 and ground, its anode being at ground.
- a negative bias voltage source 104 is connected to point 101 through a resistance 105. The bias voltage is sufficiently high to render diode 103 conductive, for all values of the tone signal.
- Point 101 is connected in series with a double diode gate 106, comprised of diodes 107 and 108 having their anodes back to back to form agating junction 109.
- the cathode of diode I08 proceeds to a resistance, as 80 of FIG. 1, which may be termed broadly a load, or coupling resistance.
- Leads O then correspond with connections to other gates, i.e. may represent a 4' or 8' bus, as 56 or 32 of FIG. 1.
- the connections 0, are employed for gates which use a common gating voltage, whereas O indicates connections to other diodes which use the same pitch, by analogy to FIG. 1.
- the point 101 of FIG. 4 may correspond with points such as 16, 14, 12 or 11 of FIG. 1.
- the operation of the diode gate 106 is the same as has been described in FIG. I. The difference between the systems of FIG. 1 and FIG. 4 relates then to the substitution of shunt diode 103, for series diodes as 8, 6, etc. ofFIG. 1.
- the diodes 107, 108 (FIG. 4) are dispensed with, and resistances 120, 121 substituted, providing a junction or gating point 109.
- To point 109 is connected the cathode of a single diode 122, the anode of which is grounded, and negative bias is applied to the anode of diode 122 from terminal 104 via resistance 105.
- diode 122 By virtue of its negative bias, diode 122 is normally conductive and provides a low impedance ground at point 109. By virtue of that same bias, diode 125, in series with tone source 100, is rendered nonconductive of tone signal, since its anode is coupled to point 109.
- diode 122 On application of positive bias voltage to point 109, by closure of switch 110, diode 122 becomes nonconductive and diode I25 conductive, rendering the entire gate transmissive to signal to the output system.
- the general and overall system of FIG. I may employ the gating system indicated in FIG. I, or either of those illustrated in FIGS. 4 and 5.
- the impedance 78 may be employed in the system of FIG. 5, but is not required in the system of FIG. 4, since in that system diode 103 provides the required obviating action.
- a further diode gate connected to gate said tone signal from said tone signal source to said first diode gate
- said first and further diode gates being normally both nonconductive of said tone signal from said tone signal source to said load circuit
- keying means for at will connecting said source of gating voltage to said first diode gate
- said first diode gate being arranged to become conductive in response to application of said gating voltage thereto by said keying means
- said first diode gate includes a pair of back to back diodes
- a further diode gate connected to gate said tone signal from said tone signal source to said first diode gate
- said first and further diode gates being normally both nonconductive of said tone signal from said tone signal source to said load circuit
- keying means for at will connecting said source of gating voltage to said first diode gate
- said first diode gate being arranged to become conductive in response to application of said gating voltage thereto by said keying means
- said first diode gate includes a pair of back to back diodes
- said further diode is connected in series with said tone signal source
- a further diode gate connected to gate said tone signal from said tone signal source to said first diode gate
- said first and further diode gates being normally both nonconductive of said tone signal from said tone signal source to said load circuit
- keying means for at will connecting said source of gating voltage to said first diode gate
- said first diode gate being arranged to become conductive in response to application of said gating voltage thereto by said keying means
- said first diode gate is a shunt diode gate and said further diode gate is connected in series between said tone signal source and said first diode gate.
- said impedance having a value small relative to the nonconductive impedance of said further diode gate but large relative to the conductive impedance of said further diode gate.
- said impedance having a value small relative to the nonconductive impedance of said further diode gate but large relative to the conductive impedance of said further diode gate.
- each of said diode gates includes only one solid-state diode.
- a gating circuit comprising,
- said keying circuit being normally nonconductive of said tone signal to said load and being rendered conductive responsive to application thereto of said DC keying voltage
- said solid-state diode keying circuit includes back to back diodes, and said gate includes a single solid-state diode.
- a gating circuit comprising,
- said keying circuit being normally nonconductive of said tone signal to said load and being rendered conductive responsive to application thereto of said DC keying voltage
- said keying circuit is a shunt to said source of signal and said gate is connected in series between said source of signal and said load.
- a gating circuit comprising,
- said keying circuit being normally nonconductive of said tone signal to said load and being rendered conductive responsive to application thereto of said DC keying voltage
- said keying circuit is in series with said source of signal and said load, and said gate is in circuit shunting said source of signal.
- a keying system for an electric organ comprising a tone source
- bypass circuit to ground having a low impedance relative to the leakage impedance of said first gate and a high impedance relative to the conductive impedance of said first gate, at any frequency of said tone source.
- said tone channels including each a separate normally nonconductive keying device
- shut impedance connecting the junction of said gate and said tone channels to a point of reference potential
- said shunt impedance having an impedance value relatively small in comparison with the nonconductive impedance of said gate while nonconductive and relatively large in comparison with the conductive impedance of said gate, whereby said shunt impedance substantially attenuates feed-through of said signal from said source of tone signal to said tone channels only while said gate is nonconductive.
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Abstract
Description
Claims (12)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US54138066A | 1966-04-08 | 1966-04-08 |
Publications (1)
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US3609202A true US3609202A (en) | 1971-09-28 |
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US541380A Expired - Lifetime US3609202A (en) | 1966-04-08 | 1966-04-08 | Electronic organ gating system |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2618753A (en) * | 1950-04-14 | 1952-11-18 | Int Standard Electric Corp | Electronic switching device |
US3176060A (en) * | 1960-07-01 | 1965-03-30 | Baldwin Co D H | Gating system for electrical musical instrument |
US3408449A (en) * | 1965-04-05 | 1968-10-29 | Rodgers Organ Company | Keying and wave-shaping circuit for electronic musical instrument |
US3509263A (en) * | 1966-07-07 | 1970-04-28 | Warwick Electronics Inc | Electronic musical instrument keying system including attack and decay control |
-
1966
- 1966-04-08 US US541380A patent/US3609202A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2618753A (en) * | 1950-04-14 | 1952-11-18 | Int Standard Electric Corp | Electronic switching device |
US3176060A (en) * | 1960-07-01 | 1965-03-30 | Baldwin Co D H | Gating system for electrical musical instrument |
US3408449A (en) * | 1965-04-05 | 1968-10-29 | Rodgers Organ Company | Keying and wave-shaping circuit for electronic musical instrument |
US3509263A (en) * | 1966-07-07 | 1970-04-28 | Warwick Electronics Inc | Electronic musical instrument keying system including attack and decay control |
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Date | Code | Title | Description |
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AS | Assignment |
Owner name: SECURITY PACIFIC BUSINESS CREDIT INC., 10089 WILLO Free format text: SECURITY INTEREST;ASSIGNOR:BPO ACQUISITION CORP. A CORP OF DE;REEL/FRAME:004298/0001 Effective date: 19840615 Owner name: GENERAL ELECTRIC CREDIT CORPORATION, A NY CORP., C Free format text: SECURITY INTEREST;ASSIGNOR:BPO ACQUISITION CORP., A DE CORP;REEL/FRAME:004297/0802 Effective date: 19840615 |
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AS | Assignment |
Owner name: BPO ACQUISITION CORP., 180 GILBERT AVE., CINCINNAT Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:D.H. BALDWIN COMPANY AN OH CORP.;REEL/FRAME:004385/0934 Effective date: 19840615 |
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AS | Assignment |
Owner name: BALDWIN PIANO & ORGAN COMPANY Free format text: CHANGE OF NAME;ASSIGNOR:BPO ACQUISTION CORP.;REEL/FRAME:004473/0501 Effective date: 19840612 |