US3255292A - Automatic repetitive rhythm instrument timing circuitry - Google Patents

Description

D. M. PARK June 7, 1966 AUTOMATIC REPETITIVE RHYTHM INSTRUMENT TIMING CIRCUITRY Filed June 26, 1964 6 Sheets-Sheet l D. M. PARK 3,255,292

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AUTOMATIC REPETITIVE RHYTHM INSTRUMENT TIMING CIRCUITRY June 7, 1966 6 Sheets-Sheet 5 Filed June 26, 1964 INVENTOR. Donald M. Park ATTORNEY June 7, 1966 AUTOMATIC REPETITIVE RHYTHM INSTRUMENT TIMING CIRCUITRY Filed June 26, 1964 D. M. PARK 3,255,292

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ATTORNEY United States Patent O 3 255 292 AUTOMATIC REPETITIVE RHYTHM INSTRUMENT TIMING CIRCUITRY Donald M. Park, Raleigh, N.C., assigner to The Seeburg Corporation, Chicago, Ill., a corporation of Delaware Filed June 26, 1964, Ser. No. 378,093 14 Claims. (Cl. 84-1.03)

This invention represents an improvement over the inventions described in and this application is a continuation-in-part of my copending applications Electronic Music Circuit, Serial No. 310,533, tiled September l23, 1963, now U.S. Patent Number 3,146,290, and Tempo Control for Electrical Musical Instruments, Serial No. 213,934, filed August l, 1962. The descriptions in said copending-applications are incorporated herein by reference. This invention also represents an improvement over my prior Patent 3,105,106 to which reference will be made.

This invention relates generally to circuits for electrically producing music and particularly to an automatic repetitive rhythm instrument which can accompany a player operated instrument, such as an electric organ, such that various selections of automatic repetitive ryhthm sounds can be combined at the same tempo with those produced by the player operated instrument or combined but at an independent tempo.

' One of the more popular electronic musical instruments is known as a side man, and its purpose is to automatically produce a repetition of percussion rhythms. The side man is usually comprised of ten or more instruments such as Bass Drum, Tom-Toms, Blocks, Cymbals, and the like which may be electronically combined to produce rhythms such as the Tango, Rhumba, Fox Trot or Waltz. The instruments are produced electronically by phase shift oscillators or other noise generators, and when pulsed according to some predetermined time sequence as accompaniment for an electronic organ, they produce pleasing repetitive musical effects. The pulse generation, commutation and distribution necessary to produce the repetitive rhythms in the side man usually involve some form of mechanical or electro-mechanical commutation.

In the older prior art repetitive rhythm or side man devices, the switching speed, that is, the rhythm speed or tempo, when playing any particular instrument or group yof instruments is controlled yby a conventional mechanical variable speed drive; This has produced various well-known noise and mechanical problems. This type of commutation has another disadvantage in that due to mechanical inertia speed cannotV be changed instantaneously, so as to change the tempo of the repetitive rhythm instantaneously, whereas fast or instantaneous tempo change is recognized as adding much to the enjoyment of repetitive rhythm instrument accompaniment.

Another limitation of prior art repetitive rhythm devices particularly with regard to the circuitry which selects and pulses the instruments and instrument combinations has been an inability to provide complex mixing of instruments, mixing of special beats and the like. An advance in the art is provided by the inventions taught in the referred to copending applications Serial No. 310,- 533 and Serial No. 213,934 and in my prior Patent 3,105,106 in that much of the circuitry of these prior inventions lends itself to rapid tempo change and to more complex rhythms even when obtained through electromechanical development and commutation of the instrument control pulses. The need has remained however in automatic repetitive rhythm circuitry for improvements in pulse generation, selection, mixing and distribution to the individual instruments and in tempo control, all of which improvements are basically concerned with more Patented June 7, 1966 ice efficient utilization of the timing pulses both for instrument arrangements and tempo regulation.

It is therefore an object of this invention to provide a substantially improved circuitry for an automatic repetitive rhythm instrument.

It is anohter object of this invention to provide means for eliminating mechanical and electro-mechanical pulse generation and commutation in the automatic repetitive rhythm instrument.

Another object is to provide circuit means for electrically pulsing instrument generators in an automatic repetitive rhythm instrument which means provides a maximum range in deriving complex rhythms.

Another odbject is to provide in an automatic repetitive rhythm instrument circuit means for electrically pulsing instrument generators with which the tempo or frequency of pulsing may be instantaneously changed.

Another object is to provide in an automatic repetitive rhythm .instrument a pulse generation, selection, mixing distribution, and frequency control for pulsing and timing instrument generators which is entirely electrical or electronic in nature.

The foregoing and other objects will appear from .the drawings, in which:

FIGURE 1 is a general schematic diagram of a musical cricuit embodying the invention.

FIGURE 2 is a schematic diagram showing a multistage ring counter and diode logic matrix cricuit for counting and spatially distributing timing pulses.

FIGURE 3 is a wave diagram of the timing waves obtained from the counter of FIGURE 2.

FIGURE 4 schematically illustrates a diode logic circuit employed in the matrix.

FIGURE 5 schematically illustrates a combining of diode logic circuits.

FIGURE 6 schematically illustrates an alternate counting and matrix circuit.

FIGURE 7 is a wave diagram of the timing waves obtained from the counter of FIGURE 6.

FIGURE 8 schematically illustrates a circuit for cornbining a plurality of the FIGURE 7 timing waves.

FIGURE 9 illustrates a typical slightly exaggerated wave shape for an NPN type switch.

FIGURE 10 illustrates in slightly exaggerated form the I FIGURE 9 wave shape after being differentiated.

FIGURE 11 illustrates an example of an OR circuit useful in the invention.

As previously stated, the invention is primarily concerned with those aspects of an automatic repetitive rhythm instrument which have to do with instrument pulsing and timing. Before proceeding to the moredetailed discussion of the invention, reference is made to the general diagram of FIGURE 1, in which represents a continuous source of timing pulses provided by a y suitable oscillator, the pulses being of equal magnitude and evenly spaced with respect to time according to some desired beat. The pulse source 100 is of variable frequency so as to givea variable beat to the music and is connected to a suitable frequency control 101 which may, for example, be regulated by a manual variable voltage device 102 or other similar manual device known to the art for controlling pulse generator frequency.

In the copending application Serial No. 213,934, there is disclosed a separate invention concerned with automatically synchronizing tempo of an automatic repetitive instrument and player instrument. Since the automatic as well as the manual type of tempo control may be combined with other elements of the present invention, FIGURE 1 represents at 103 an automatic tempo adjusting circuitry which may be of the type shown in the referred to copending application Serial No. 213,- 934 and which as indicated in FIGURE 1 is connected to pick up pulses entering the rhythm selector switch 106 and is also lconnected to the player operated devicey e.g. the electric organ 110.

As fully explained in the copending application Serial No. 213,934, the invention of the copending application effectively compares the tempo or frequency of a representative pulse from the player operated organ 110 with a pulse representative of tempo taken from one of the instruments 104 in the automatic repetitive rhythm device and as the organ tempo increases or decreases the tempo of the automatic repetitive rhythm device instruments increases or decreases in the same manner so as to keep the tempos synchronized.

As further explained in the copending application Serial No. 213,934, the comparison and tempo synchronization is eiected by developing an alternately positive-negative wave shape from a pulse representative of the repetitive rhythm instrument tempo. This wave shape is gated to a memory and the gate itself is ultimately controlled by one of the pedals of the organ which the repetitive rhythm instrument may accompany. The level of the memory controls the frequency of the puise generator employed in the repetitive rhythm instrument. Thus, if the organ pedal tempo is synchronized With the repetitive instrument tempo the gating does not effect the level whereas if the gating lets either positive or negative portions of the developed wave shape through to the memory, the level and consequently the frequency of the pulse generator will change in a direction to bring the tempos of the organ and repetitive rhythm instrument into synchronization.

Continuing with FIGURE 1, the timing pulses are fed from source 100 to an electronic pulse counting and matrix circuitry 105 the purpose of which is to count the incoming spatially undistributed timing pulses and from these develop a plurality of wave shapes spatially distributed over a plurality of outputs such that logic theory may be employed in a suitable matrix later discussed to gain a wide choice of instrument actuating pulses which may be fed through an appropriate rhythm selector switch 106 to the instruments 104 and ultimately to the audio section represented by amplifier 107 and speaker 108. Simply as representative of instrument grouping there is shown an instrument group of drum, blocks and cymbals. As described in Patent 3,105,106,

selector switch 106 enables individual instruments e.g.

a drum or blocks to be played or a combination of instruments e.g. drum and blocks to be combined into some desired rhythm. That is, once the timing and instrument actuation pulses are presented to the selector switch, the operator merely by manual switching can direct particular instrument actuation pulses to particular instruments and thus determine which instruments or combination of instruments will be played.

In effect, circuitry 105 spatially divides the timing pulses in such a manner that a matrix is able to distribute them in a predetermined manner. Compared to prior art and my prior copending applications it will be immediately appreciated that the present invention which is primarily concerned with the circuitry 105 provides a completely electrical-electronic pulse generation, mixing, distribution and tempo regulation system for the automatic repetitive rhythm instrument. In the circuitry illustrated as exemplary embodiments in the previously referred `to copending application Serial No. 310,533 and Patent 3,105,106, it should also be noted that the pulse generator in each case included a pluarlity of physically spaced terminals on which the timing pulses were generated and spatially distributed in a sequence. In comparison, in the present invention the timing pulse source 100 represents a source which produces on an output a continuous chain of spatially undistributed timing pulses to which the counting-matrix circuit 105 responds and provides on a plurality of output terminals any desired repeatable sequence of spatially distributed tone generator actuating pulses.

Referring next to FIGURE 2, the electronic pulse counting and spatial'distributing circuitry 105 of FIG- URE 1, is made up in one embodiment of a two ring counter 120 which receives the timing pulse series on line 121. Counter 120 in turn comprises a first counter group of twelve bistable devices 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and a second counter group of bistable devices A B, C, D. The bistable devices may be of any type known in the counting art such as a transistor latch, a tunnel diode, a Shockley diode, a Neon tube or another type of bistable transistor device. All of the first group are connected to incoming line 121 and Within the first group starting with device zero, each device feeds or ands the next successive device until device 11 is reached which feeds back into device zero and also provides a common incoming time counting pulse to all of `the devices in the vsecond group. Within the second group, A feeds to B, B to C, C to D and D to A. From the first group of bistable devices the outputs of devices 0, 2, 3, 4, 6, 8, 9 and 10 are fed as indicated in FIGURE 2 to a diode logic matrix 125 and from the second group of bistable devices, the outputs of A, B, C and D are fed to the matrix 125. As indicated in FIG- URE 2, the output of matrix 125 is fed to the rhythm selector switch 106.

In FIGURE 3, there is shown a diagram of representative wave shapes such as might be obtained from the outputs of the bistable devices 0, 2, 3, 4, 6, 8, 9, 10, A, B, C and D with respect to an arbitrary series of 48 input timing pulses coming in on line 121 and labeled 0-47 in FIGURE 3.

Consideration will nextl be given to the matrix 125 and in this regard it may be noted that the matrix generally consists of an array of diode logic circuits illustrated at 126, 127 and 128 in FIGURE 4. Using circuit 127 as an example, the circuit includes capacitor 130,'resistor 131, and diode 132. The individual logic circuits of which there may be great numbers in any particular matrix depending on the rhythm complexity desired have many possible forms of interconnection some of which are explained in later discussion.

Negative potential logic is employed which is defined as meaning that the timing pulse can only get through when the gate is most negative. Assuming that it is desired to select timing pulse 2O in FIGURE 3. That is, we assume that the rhythm selector switch 106 has been positioned so that a particular instrument say a drum is to be pulsedl at the time corresponding to timing pulse 20. Looking at FIGURE 3, it can be seen that at time 20, wave 8 goes negative and wave B is negative at this same time. Wave 8 at time 2O since it goes negative at time 20 can thus be used as a time 20 pulse provided it can be gated precisely at time 20. As a function we say time 20=f(8-B). By connecting the wave output of bistable device 8 to the input point 'I` of the FIGURE 4 logic circuit and the output of bistable device B to the gate terminal G, a pulse will be derived at terminal P which coincides in time with the timing pulse 20.

From the foregoing, it can be seen that the timing 'pulses ultimately employed are not, when using the counting embodiment of FIGURE 2, the original timingpulses per se but ra'ther are timing pulses that are obtained from the FIGURE 3 array and that coincide within the count-,

ing-matrix circuitry with the original timing pulses. In

other arrange-ments of the matrix the original timing pulses could be gated directly. It m-ay also be mentioned that while AND `type logic has been discussed, OR type may also be employed as illustrated by FIGURES 5 and 1'1. Positive potential logic instead of negative potential logic may also be used. Referring for the moment to FIGURE 11, there is illustrated a circuit for combining a plurality of FIGURE 3 gating waves. In FIGURE 11,

l a fixed positive potential at point 150 applied to load resistor 1511 enables an OR action when pulses B or D from FIGURE 3 are applied to the respective diodes 152, '153. In this case, there can be fed to the gate G of FIGURES 4 or 5 the pulse pattern indicated at 154 in FIGURE 1l. The object of using the FIGURE 1l OR circuit might `for example be to get instrument actuating pulses corresponding to Atiming pulses 20 and 44 by applying the pulse train 8 from FIGURE 3 to point T of FIG- URE 5.

It will be noted that the multi-stage counting arrangement of FIGURE 2 is effectively a scale of 12 counter coupled to a scale of 4 coun-ter. yUsing the arbitrarily selected sequence of 48 timing pulses per repeatable sequence, it may also be stated that a scale of 8 counter coupled to a scale of 6 counter would be equally effective as well .as a scale of 3 coupled to a scale of 16, the object being to get a number of scales which when multiplied together will equal 48. Stated somewhat different-ly the counting arrangements illustrated provide for a sequential grouping of scale of plural number counters the product of such numbers being equal to the number of timing pulses, such as 48, in a given timing pulse sequence. The principal concept in the present invention is, of course, that of resorting to continuous pulse generation and subsequent utilization of counting and logic theory to place the pulses in time and space where they are needed. One of the advantages of the invention is that the counting-matrix concept leads itself to a variety of arrangements and an almost unlimited choice of pulse selection patterns. IFIGURE 6 illustrates, for example, another counter-matrix larrangement substantially different from FIGURE 2 bu-t suitable to the FIGURE 1 generalized diagram with respect to providing the electronic pulse counting and matrix circuitry designated in FIGURE 6 as 105". In FIGURE 6 certain of the bistable devices of iFIGURfE 2 namely devices 0, l1, r2, 3, 4, 5, A, B, C and D are used in a different sequential counter grouping and with these devices there is employed a flip-flop 170A with a complement input and outputs U and U. The operation of the counting arrangement of FIGURE 6 is essentially the same with respect to counting as the counting arrangement of FIGURE 2 except it will be noticed that the grouping provides a scale of 6, a scale of 4 and -a .scale of 2 (6 4 2=48). As frequency dividers the division is`by 6, then 4, then 2. In FIG- URE 6 the outputs o-f lthe devices 0, 2, 3, 4, A, B, C and D and the outputs U and U are all fed to the diode logic matrix 1.25 previously described. The timing wave shapes developed -by 'these various outputs are illustrated in FIGURE 7.

Using the logic analysis previously used with respect to FIGURE 3, it can `be seen that with respect to FIG- URE 7 if we arbitrarily select timing pu- lse 20, 2 wave from FIGURE 7 goes negative at the time corresponding to timing Ipulse 20. Therefore "2 can be fed to point T in FIGURE 4. We must now look at FIGURE 7 and find a -gate 'which when ttormed only allows this pulse (ie. the 2 pulse at time 20) to go through. That is, we must `look for a gate to put point G in an on state. Thus, D .and U are both vnegative at :the same time. We can write a function =DU which says that when D and U .are both negative, then the gate is on at this most negative time. Thus, by .forming such an AND gate in simple groups and then making AND and OR groups as lfor example may :be accomplished with FIG- URES and 8, it can be seen that relatively complex selections can be obtained. Those skilled in the art will readily appreciate other logic series and parallel combinations which might go to make 4up the diode logic matrix 125.

Of particular interest to the use of negative potential logic is the fact that a fast leading edge .of a switched voltage will differentiate into a larger pulse in the output of the diode network than will a slowly switched volta-ge. The NPN type of switch inherently has the wave shape of FIGURE 9 which differentiates t0 the wave shape of FIGURE 10. Thus, a relatively large control pulse is obtained as illustrated by FIGURE l0.

Therefore, it will readily be seen that if NPN switching choices in utilizing the invention once its basic counting and logic matrix theory -is fully appreciated.

Having described the invention, what is claimed is:

1. In an electron-ic music circuit having a plurality of tone generators to be selectively and rhythmically pulsed at given times corresponding to desired beats thereof; a pulse generator operable to produce a continuous sequence of spatially undistributed timing pulses at some predetermined frequency, certain cf said timing pulses coinciding in time with certain yof said beats; electronic means continuously actuated by said timing pulses and providing at a plural-ity of output terminals a repeatable sequence o-f tone generator actuating pulses corresponding in time with predetermined ones of said timing pulses and selected iones of said tone lgenerator beats; and means Ifor selectively coupling different ones ot said outputs to said tone generators whereby 'to pulse particular tone generators and combinations thereof at particular times according to the desi-red :beats thereof.

2. In an electronic music circuit according to claim 1 and including `means `for adjusting the frequency of said pulse generator.

3. In an electronic music circuit according to claim 1 in `which said electronic means comprises `a coun-ting and diode logic matrix network.

`4. In an electronic music circuit las claimed in claim 3 in which said Vdiode logic comprises interconnected resistor-capacitor-diode logic elements.

5. In an electronic music circuit as claimed in claim 3 in which said diode -logic depends' `on yNP'N transistor switching and negative -potential logic.

6. In an electronic music circuit as claimed in claim 1 including means lfor automatically [adjusting the trequency .of `said pulse generator in accordance with the tempo of a separate operator played music instrument.

7. In an electronic music circuit having a plurality of tone generators to be selectively and rhythmically pulsed at given times corresponding to desired beat-s thereof; a pulse generator operable to produce a continuous sequence of spatially undistrizbuted timing pulses at some predetermined frequency, certain of said timing pulses coinciding in time with certain `of said tbeats; pulse counting mie-ans continuously actuated 'by said .timing pulses and providing at a plurali-ty of output terminals a repeatable sequence of pulses having potentials and potential changes :corresponding Lwith predetermined ones of said timing 'pulses and selected yones of said tone generator beats; a diode logic matrix connected to said output terminals and including gating circuits responsive to the coincidence pattern of said potential-s and potential changes at predetermined timing pulse times and'being effective to gate to a second set `of loutput terminals a repeatable sequence of tone generator actuating pulses corresponding 'in time `with predetermined ones of said tim-ing pulses and selected ones of said tone generator beats; and means lfor selectively coupling different ones of said second outputs to said itone generators whereby to p'ulse particular tone generators and combinations thereof at particular times according to the desired beats l thereof.

pulsed at lgiven times corresponding to desired beats thereof; a pulse generator operable lto produce a continuous sequence of spatially undistributed timing pulses at some predetermined frequency, certain of said timing pulses coinciding in time with certain of said beats; pulse counting means continuously actuated by said timing pulses; a matrix actuated -by said pulse counting means and providing at each of ia plurality of -output terminals a repeatable sequence of tone generator actuating pulses corresponding in time with predetermined one-s of said timing pulses selected ones of said tone generator beats; and means `for selectively coupling dilierent ones of said outputs to said tone generators whereby to pulse particular tone generators and combinations thereof at particular times laccording to 'the desired beats thereof.

9. In an electronic -music circuit Ihaving a plurality of tone generators to be selectively :and rhythmically pulsed at given times corresponding :to desired beats thereof; a pulse generator operable to produce a continuous sequence of spatially undistributed timing pulses at some predetermined frequency, certain of said timing pulses coinciding in time with certain of said beats; multistage .pulse counting `means actuated by said timing pulses and providing at each of a plurality of `output terminals a repeatable sequence of Ipulses having potentials and potential changes corresponding in time to particular ones of said timing pulses and selected ones of said tone generator beats; a matrix connected to said pulse counting means and including `gating means responsive to the existence of said potentials and potential changes at times corresponding to :particular ones of said timing pulses and tone generator beats yand providing at each of a second set of output terminals a repeatable sequence of tone -generator actuating pulses corresponding in time with predetermined ones of said timing pulses and tone -generator beats; and mean-s 'for selectively `coupling ditferent ones of said second output terminals to said tone generators whereby to pulse particular tone generators and combinations thereof .at particular times according to lthe desired beats thereof.

10. In an electronic music circuit having a plurality of tone generators to be selectively and rhythmically pulsed `at gives times corresponding to desired beats thereof; a pul-se generator operable to produce a continuous `sequence o-f spatially undistributed timing pulses at some predetermined frequency, certain of said timing .pulses coinciding in time with cer-tain of said beats; means for Iadjusting the frequency of said pulse generator in accordance with :the tempo of a separate operator played music instrument; electronic means comprising a multi-stage ring counting and diode logic network actuated by said timing pulses and providing at a plurality of output terminals a repeatable sequence off tone generator actuating pulses `corresponding in time with predetermined ones of `said tim-ing pulses and tone generator beats; means for selectively couplingjdifferent ones of said outputs to said tone `generators whereby t-o pulse particular tone generators land combinations thereof at particular times according to the desired beats thereof.

11. In au electronic music circuit having a plurality of tone generators to be selectively and rhythmically pulsed at given times corresponding to 'desired beats thereof; a pulse generator operable to produce a continuous sequence of spatially undistributed timing pulses at some predetermined frequency, certain of said timing pulses coinciding in time with certain of said beats; multi-sequential stage pulse counting means coupled yto said pulse generator land yactuated by said timing pulses; a dioderesistor-capacitor logic matrix connected to selected stages of said pulse counting means `and providing at each of a plurality of output :terminals 4a repeatable sequence of tone generator actuating pulses corresponding in time with predetermined ones of said tim-ing pulses and tone generator beats; and means for selectively coupling different ones of said outputs to said tone generators whereby to pulse particular tone generators and combinations thereof at particular times according to the desired beats thereof.

12. In an electronic music circuit having a plurality of tone generators to be selectively and rhythmically pulsed at given times corresponding to desired beats thereof; a pulse generator operable to produce a continuous sequence `of spatially -undistriibuted timing pulses at some predetermined frequency, certain of said timing pulses coniciding in 'time with certain of said beats; sequential counting means coupled to said pulse generator and `actuated by said timing pulses and providing at each of a plurality of output terminals Ia repeatable sequence of pulses having potentials .and potential changes corresponding in time to particular ones of said timing pulses and tone generator beats; a matrix connected to said pulse counting means and including gating means responsive to the existence of said potentials and potential changes `at times corresponding to particular ones of said timing pulses and tone generator :beats and providing at each of a second set of output terminals a repeatable sequence of `tone generator `actuat-ing pulses corresponding in time with predetermined ones of said timing pulses and tone generator beats; and ymeans ior selectively coupling different ones of 4said second output terminals to said tone generators whereby to pulse particular tone generators and combinations thereof `at particular times.

i3. In an electronic music circuit -as claimed in claim 12 in which said sequential counting means comprises a scale of counter of a tlrst plural number such as 12 coupled to said pulse generator and a second scale of counter of a second plural number such `as 4, the product of t-he iirst and second plural numbers being equal to the number of said timing pulses, such as 48, in a given timing pulse sequence.

'14. In an electronic music circuit as claimed in claim l2 in which said sequential counting means comprises a succession of coupled scale of plural number counters the product of such numbers being equal to the number of said timing pulses in a given ytiming pulse sequence.

References Cited by the Examiner UNITED STATES PATENTS 2,610,243 9/ 1952 Burkhart et al. 3,105,106 9/1963 Park 84-1103 3,140,336 7/1964 Campbell M `84-1.03

OTHER REFERENCES ARTHUR GAUSS, Primary Examiner. I. C. EDELL, Assistant Examiner.

Claims (1)

1. IN AN ELECTRONIC MUSIC CIRCUIT HAVING A PLURALITY OF TONE GENERATORS TO BE SELECTIVELY AND RHYTHEMICALLY PULSED AT GIVEN TIMES CORRESPONDING TO DESIRED BEATS THEREOF; A PULSE GENERATOR OPERABLE TO PRODUCE A CONTINUOUS SEQUENCE OF SPATIALLY UNDISTRIBUTED TIMING PULSES AT SOME PREDETERMINED FREQUENCY, CERTAIN OF SAID TIMING PULSES COINCIDING IN TIME WITH CERTAIN OF SAID BEATS; ELECTRONIC MEANS CONTINUOUSLY ACTUATED BY SAID TIMING PULSES AND PROVIDING AT A PLURALITY OF OUTPUT TERMINALS A REPEATTABLE SEQUENCE OF TONE GENERATOR ACTUATING PULSES CORRESPONDING IN TIME WITH PREDETERMINED ONES OF SAID TIMING PULSES AND SELECTED ONES OF SAID TONE GENERATOR BEATS;

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