United States Patent [191
`Youakim
`
`[11] Patent Number:
`[45] Date of Patent:
`
`5,036,742
`Aug. 6, 1991
`
`4,418,598 12/1983 Klynas ........................... .. 84/1.04X
`4,583,443 4/1986 Senghaas m1. ..
`84/484
`
`4,602,551 7/1986 Firmani et a1. . . . .
`. . . . . . .. 84/484
`4,788,983 12/1988 Brink et a1. ................... .. 128/706 x
`
`FOREIGN PATENT DOCUMENTS
`3140483 4/1983 Fed. Rep. of Germany
`84/DIG.
`24
`0160681 12/1981 Japan ................................... .. 84/484
`Primary Examiner-Stanley J. Witkowski
`Attorney, Agent, or Firm-Hodgson, Russ, Andrews,
`Woods & Goodyear
`[57]
`ABSTRACT
`A device and method for monitoring theJempo of an
`instrument generating tempo beats involves the sensing
`of each tempo beat, measuring the time interval be
`tween successive beats, dividing the time interval into a
`minute, and visually indicating the measured beats/min.
`between each two successive beats. The device includes
`a piezo transducer for sensing the beats, an electronic’
`timer for measuring the time interval between each two
`successive beats, and a display associated with the timer
`for visually displaying the measured beats/min. time
`interval. The device thus provides visual feedback to a
`musician or user of the tempo of the instrument being
`played.
`
`_4 Claims, 3 Drawing Sheets
`
`[54] TEMPO MONITORING DEVICE AND
`ASSOCIATED METHOD
`Phillip M. Youakim, 122 Dexter St.,
`Tonawanda, NY. 14150
`373,686
`Jun. 30, 1989
`
`[76]
`
`[21]
`[221
`
`Inventor:
`
`Appl. No.:
`Filed:
`
`[631
`
`[51]
`
`152]
`
`[581
`
`[56]
`
`Related US. Application Data
`Continuation of Ser. No. 89,513, Aug. 26, 1987, aban
`doned.
`
`Int. Cl.5 ................... .. G09B 15/00; GlOD 13/02;
`GlOG 1/00
`US. Cl. .................................. .. 84/411 R; 84/453;
`84/477 R; 84/484
`Field of Search ................... .. 84/453, 411, 477 R,
`84/484, DIG. 12, 464, DIG. 24, 723-725, 730,
`733, 734, 743; 340/683; 369/128, 251; 128/689,
`690, 696, 706, 707, 709, 712, 713, 714
`References Cited
`U.S. PATENT DOCUMENTS
`
`3,623,734 11/1971
`3,725,561 4/1973
`4,281,663 8/1981
`4,300,225 11/1981
`4,301,528 11/1981
`4,392,409 7/1982
`
`Sakamoto .......................... .. 369/ 128
`Paul .......... ..
`84/D1G. 12
`Pringle
`....... .. 128/689
`Lambl
`84/464 R X
`
`Lert . . . . . . . . . . . . . . . .
`
`. . . .. 369/251 X
`
`Coad, Jr. et al. ........... .. 84/477 R X
`
`I8
`
`12.
`
`10-“
`
`Z6
`
`16 -—>
`
`33
`
`Yamaha Exhibit 1005 Page 1
`
`

`
`U.S. Patent
`
`Aug. 6, 1991
`
`Sheet 1 of 3
`
`Yamaha
`
`Exhibit1005
`
`Page2
`
`Yamaha Exhibit 1005 Page 2
`
`

`
`U.S. Patent
`
`Aug. 6, 1991
`
`Sheet 2 of 3
`
`-5,036,742
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`Yamaha
`
`Exhibit1005
`
`Page3
`
`Yamaha Exhibit 1005 Page 3
`
`
`
`
`
`

`
`U.S. Patent
`
`Aug. 6, 1991
`
`Sheet 3 of 3
`
`5,036,742
`
`
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`Yamaha
`
`Exhibit1005
`
`Page4
`
`Yamaha Exhibit 1005 Page 4
`
`

`
`1
`
`TEMPO MONITORING DEVICE AND
`ASSOCIATED METHOD
`
`25
`
`35
`
`This application is a continuation of application Ser. 5
`No. 07/089,5l3, ?led Aug. 26, 1987 and now aban
`cloned.
`BACKGROUND‘ OF THE INVENTION
`This invention relates generally to the ?eld of music
`accessories, and relates more particularly to a tempo
`monitoring device and an associated method.
`There exist known apparatus, such as the metronome,
`for marking exact time for a musician. However, such
`an apparatus commonly marks time at a steady rate and
`cannot compensate for purposeful increases or de
`creases in music tempo which the musician may desire.
`Therefore, in tempo monitoring applications in which a
`musician desires to modify or vary the tempo of music
`played by his instrument yet be informed of the steadi
`ness of the tempo during selected portions of the tune,
`such known time-marking apparatus cannot be used.
`It is an object of the present invention to provide a
`new and improved device and method for monitoring
`the tempo of an instrument.
`Another object of the present invention is to provide
`such a device and method enabling a musician to pace
`himself and to adjust the music tempo as desired.
`Still another object of the present invention is to
`provide such a device providing visual feedback to the
`musician of the steadiness of the tempo of the music
`played.
`Yet still another object of the present invention is to
`provide such a device which is lightweight, compact
`and portable.
`A further object of the present invention is to provide
`such a device which is silent in operation.
`A still further object of the present invention is to
`provide such a device which is well-suited for studio,
`practice or live performances.
`SUMMARY OF THE INVENTION
`This invention resides in a device and associated
`method for monitoring the tempo of music played with
`an instrument generating tempo beats.
`The device of this invention includes means for sens
`ing each tempo beat generated by the instrument and
`computer means responsive to the sensed beats for mea-_
`suring the time interval between successive beats and
`dividing the interval into a time unit, i.e. one minute.
`The device further includes indicator means associated
`with the computer means for providing a visual indica
`tion of the measured beats/time unit, i.e. beats/minute,
`between each two successive beats.
`The method of the invention includes the steps in
`volved in providing a visual indication of the music
`tempo. More speci?cally, the method includes the steps
`of sensing each tempo beat, measuring the time interval
`between successive beats, dividing the internal into a
`time unit, i.e. minute, and visually indicating the mea
`sured beats/time unit, i.e. beats/minute, between each
`two successive beats.
`BRIEF DESCRIPTION OF THE DRAWINGS
`FIG. 1 is a perspective view of one embodiment of 65
`the device in accordance with the present invention
`shown operatively positioned upon the edge of a snare
`drum.
`-
`
`5,036,742
`2
`FIG. 2 is a side elevation view of the FIG. 1 device
`and drum.
`FIG. 3 is a perspective view of the FIG. 1 embodi
`ment showing the underside thereof.
`FIG. 4 is a view showing in generalized block dia
`gram form the control circuit for a monitoring opera
`tion conducted with the FIG. 1 embodiment and drum.
`FIG. 5 is a detailed block diagram of the control
`circuit shown generally in FIG. 4;
`FIG. 6 is a diagrammatic view of a circuit chip layout
`for implementing the control circuit of FIG. 5; and
`FIG. 7 is a perspective view of an alternative embodi
`ment of the device in accordance ‘with the present in
`vention.
`DETAILED DESCRIPTION OF ILLUSTRATED
`EMBODIMENTS
`Turning now to the drawings in greater detail and
`considering ?rst FIG. 1, there is illustrated a tempo
`monitoring device, in accordance with the apparatus of
`the present invention and generally indicated 10, shown
`operatively positioned upon the edge of a snare drum 12
`capable of generating identi?able tempo beats when
`played. As best shown in FIG. 2, the drum 12 includes
`a generally cylindrical shell 80, a skin 82 stretched.
`across the shell 80, a hoop 84 for holding the skin 82 in
`place, and a rim 86. As will be apparent hereinafter, the
`device 10 engages the drum rim 86 and hoop 84 when
`the device 10 is operatively positioned upon the drum
`12.
`With reference to FIGS. 1-3, the device 10 includes
`housing means in the form of a substantially enclosed
`box 16. The box 16 is constructed of a suitable material,
`such as molded polyurethane, and de?nes two opposite
`side surfaces 18, 20, opposite top and bottom surfaces
`22,24, respectively, and a back surface 26. The top sur
`face 22 is arcuate as shown so that a front portion 28
`thereof extends generally downwardly as a path is
`traced from the back surface 26 and along the top sur
`face 22. The box 16 further de?nes a frontal drum-fac
`ing surface 30 as shown and a skin-engaging surface 32'
`arranged generally perpendicular to the surface 30 and
`the adjoining portion 28 of the top surface 22. The
`drum-facing and skin-engaging surfaces 30 and 32 are
`joined by a series of surfaces 70,72,74, 76 and 78 which
`collectively de?ne a notch 15 as shown in FIG. 2 in the
`box 16 for attaching the device 10 to the drum 12. More
`speci?cally, and with reference still to FIG. 2, the notch
`15 is of such size to accept the drum rim 86 and hoop 84
`when the box 16 is manipulated thereover so that the
`box 16 is effectively hooked to the drum 12. In such a
`hooked condition, the weight of the device 10 contrib
`utes to the stability with which the device 10 rests upon
`the drum 12. If desired, an optional spring 33 can be
`connected between the box 16 as shown in FIG. 1, and
`the bottom rim of the drum 12 to prevent excessive
`bouncing of the device 10 such as can occur if the drum
`12 is played hard.
`With reference to FIGS. 3 and 4, the device 10 fur
`ther includes means, generally indicated 36, for sensing
`each tempo beat generated by the drum 12. The sensing
`means 36 includes a pickup transducer 38 mounted
`within the skin-engaging surface 32 so as to face gener
`ally downwardly therefrom. In the device 10, the
`pickup transducer 38 is in the form of a piezo transducer
`adapted to sense vibrations of the skin 82 of the snare
`drum 12 and generate electrical impulses corresponding
`to the sensed vibrations.
`-
`
`45
`
`50
`
`55
`
`Yamaha Exhibit 1005 Page 5
`
`

`
`15
`
`20
`
`25
`
`30
`
`3
`With reference to FIG. 4, which is a generalized
`block diagram of the control circuit, the device 10 fur
`ther includes computer means 40 mounted within the
`box 16 for receiving the electrical impulses generated
`by the pickup transducer 38 and for measuring the time
`interval between successive beats and for dividing the
`interval into a time unit, i.e. minute. More speci?cally,
`the computer means 40 includes means, indicated 42, for
`generating a preselected number of electrical pulses per
`unit of time and means, indicated 44, for counting the
`pulses generated from the occurrence of one beat to the
`occurrence of the subsequent beat. In the device 10, the
`pulse generator 42 is in the form of a twenty hertz
`counter adapted to generate electrical pulses at regular
`intervals. The pulse counter 44 is adapted to generate an
`output signal to the signal processor 54 corresponding
`to the pulse count the instant a subsequent impulse gen
`erated by the transducer 38 is sensed. The output of
`pick-up transducer 38 is connected via line 56 to an
`input of signal processor 54, and a reset pulse is sent
`back from processor 54 via line 58 to the pulse counter
`44 after its signal is processed to start the count at zero
`for the next interval. The device 10 has an effective
`range of about nineteen beats per minute to about 133
`beats per minute, and such a range is believed to cover
`most tempos normally encountered by the musician.
`The device 10 further includes a power source in the
`form of a battery 46 mounted within the box 16 (FIG. 2)
`for applying power to the computer means 40 and an
`ON/OFF switch 48 appropriately wired between the
`battery 46 and computer means 40 permitting the musi
`cian or operator to turn the device ON or OFF at will.
`As shown in FIGS. 2 and 3, the switch 48 is mounted in
`the bottom surface 24 of the box 16 so as to be easily
`accessible to the musician.
`With reference again to FIGS. 2 and 4, the device 10
`further includes indicator means, generally indicated 50,
`for visually indicating to the rate at which beats are
`being played. To this end, the indicator means 50 in
`cludes means, indicated 54 in FIG. 4, for processing an
`output time-indicating signal corresponding to the rate
`of the input signal and a light-emitting diode (LED)
`display 52 mounted on the top surface 22 of the box 16
`for displaying the rate count corresponding to the time
`indicating signal generated by signal processor 54 in the
`form of a numerical value. Preferably, the display 52 is
`relatively large enabling the musician to easily read the
`count displayed thereby. The indicator means 50 is
`adapted to display or hold the rate count on the display
`52 until such time as the signal processor 54 receives a
`50
`subsequent input signal from the transducer 38. Upon
`receiving the subsequent signal, the rate count corre
`sponding to the subsequent output signal of the pulse
`counter 44 is displayed upon the display 52.
`When operatively positioned upon the snare drum
`with its pickup transducer 38 engagably and ?atly over
`lying an edge of the drum skin 82 in the manner shown
`in FIG. 1, the transducer 38 is in condition to sense the
`relatively strong tempo beat vibrations generated with
`the drum 12. Hence, with the device 10 switched ON
`and the drum 12 being played, the tempo beats are
`sensed by the pickup transducer 38 and appropriate
`electrical impulses are generated thereby in response to
`the tempo beats. The twenty hertz counter 44, once
`turned ON, continually counts the regular electrical
`pulses generated by the pulse generator 42 and restarts
`the count at zero upon the receipt of each signal sent
`from the signal processor 54. Therefore, each reset beat
`
`5,036,742
`4
`sensed is responsible for the sending to the indicator
`means 50 an output signal having a characteristic which
`corresponds to the count of the electrical pulses of the
`counter 44 and for restarting the pulse count of the
`counter 44 at zero.
`FIG. 5 is a more detailed block diagram, in the form
`of a TTL ?ow chart, of the control circuit of the moni
`toring device of the present invention. The output of
`pick-up transducer 38 is connected to the input of a
`threshold adjustment circuit 90 for providing volume
`sensitivity. Circuit 90 typically includes a 5K potenti
`ometer. The output of threshold adjustment 90 is con
`nected to the input of a signal conditioner 92 for elimi
`nating static or false signals. Conditioner 92 can com
`prise a Schmitt trigger circuit or, preferably, a hex in
`verter with shunt resistor. Conditioner 92 provides a +
`pulse output on line 94, and an inverted output on line
`96 as indicated in FIG. 5.
`1
`The control circuit shown in FIG. 5 further com
`prises ?rst and second counters 98 and 100, respec
`tively, first and second timers 102 and 104, respectively,
`and a rate multiplier 106. The inverted output of condi
`tioner 92 is connected by line 96 to the reset input of the
`?rst timer 102, which is a relatively slow timer putting
`out 20 Hz pulses. The output of timer 102, in turn, is
`connected to the input of the ?rst counter 98, which is
`a relatively slow counter. The + pulse output of condi
`tioner 92 on line 94 is connected to the reset inputs of
`each of the counter/drivers 108 which, in turn, are
`connected to their corresponding LED display ele
`ments 110. The signal conditioner output on line 94 also
`is connected to the reset inputs of rate multiplier 106
`and the second counter 100.
`The control circuit further comprises an AND gate
`circuit 112 which starts and stops fast timer 104. By way
`of example, AND gate 112 is a dual 4 input AND gate
`provided with leading edge triggering. This together
`with a capacitive circuit provides a pulse generating
`capability in a known manner to reset counter 98. In
`particular, the output of counter 100 is connected to
`inputs of gate 112. Gate 112, in turn, is connected by
`line 114 to blanking inputs of counter/drivers 108, by
`line 116 to the reset input of timer 104, by line 118
`through a pulse generator 120 to the clear input of
`counter 98, and by line 122 to the strobe input of rate
`multiplier 106.
`In operation, the transducer or microphone 38
`“hears” a drummer’s beat and the output signal thereof
`is conditioned by circuit 92 to be TTL compatible. The
`outputs of circuit 92 are sent to counter/driver 108, rate
`multiplier 106, counter 100 and timer 102 as previously
`described. At this instant in time, counter 98 has stored
`the number of pulses realized since the last drum beat
`and is placing that number at the rate inputs of rate
`multiplier 106. In response to the beat, the counter driv
`ers 108 are set to zero, counter 100 is set to zero and gate
`112 is turned OFF which turns ON the fast timer 104.
`With the reset command having been withdrawn from
`the rate multiplier 106 by the signal on line 94 from
`conditioner 92, rate multiplier 106 then divides the in
`terval being addressed to its inputs into 1200 and sends
`the signal result or base rate via line 124 to the LED
`counter/drivers 108.
`When counter 100 reaches l200(l200><2O Hz=l
`minute) it causes AND gate 112 to stop the fast timer
`104, strobe the rate multiplier 106 via line 122 and clear
`counter 98 via pulse generator 120 in time to receive the
`next subsequent 20 Hz pulse. The entire process is re
`
`40
`
`55
`
`65
`
`Yamaha Exhibit 1005 Page 6
`
`

`
`5
`peated in response to the next drum beat sensed by
`transducer 38.
`Thus, the circuit of FIG. 5 measures the time between
`consecutive beats and divides that interval into one
`minute, then provides a read-out via LEDs 110 of the
`beats per minute.
`By way of further illustration, FIG. 6 shows an actual
`circuit chip layout for implementing the control circuit
`represented by the TTL flow chart of FIG. 5. Trans
`ducer 38 and threshold adjustment 90 are not shown in
`FIG. 6. The reference numerals of the chips in FIG. 6
`correspond to the reference numerals‘ in FIG. 5. The
`letters A-G on the chips in FIG. 6 provide a cross-ref
`erence to columns A-G in the following table which
`
`5,036,742
`6
`,binary rate multiplier 106 is type 7497, decade counter/
`drivers 108 are type CD4026B and LED display ele
`ments 110 are common cathode type.
`The device 10 is advantageous in that it provides to
`the musician or operator visual feedback or information
`of the actual tempo of the music played with the drum
`12. Inasmuch as the count of the electrical pulses gener
`ated by the counter 44 increases as a function of time,
`the musician need only view the display 52 to be in
`formed of the relative speed or steadiness of the tempo
`of the music played. For example, if successive displays
`of the rate count indicate a relatively low numerical
`value, the musician is informed that the tempo is rela
`tively slow. Similarly, if successive displays of the rate
`
`Thus, referring to column A in Table 1, row 13 gives B5
`which means that terminal 13 on chip A, the dual 4
`input AND gate is connected to terminal 5 on chip B,
`the hex inverter (conditioner 92). Similarly, referring to
`column C, row 4 gives F3 which means that terminal 4
`on chip C, the counter 98, is connected to terminal 3 on
`chip F, the rate multiplier 106. This is one of the several
`connections between the output of counter 98 and rate
`multiplier 106. By way of further explanation, several of
`the entries in Table 1 indicated that the connections
`from one chip terminal to another is through a resistor,
`capacitor or potentiometer, for example rows 1 and 6 in
`column B and rows 1,2,12 and 13 in column E. Rows
`6-13 in column G indicate the various terminals i.e.
`f,g,d, etc., of the LED display segments to which con
`nections are made.
`By way of example, in an illustrative circuit, dual
`4-input AND gate 112 is type CD4082B, hex inverter 92
`is type 7414, 7-stage binary counter 98 is type
`CD4024B, l2-stage binary counter 100 is type
`CD404OB, dual 555 timers 102,104 are type LM556N,
`
`musician is informed that the tempo is relatively fast.
`With regard to the steadiness of the tempo, the musi
`cian need only observe the relative steadiness of the
`displayed count. For example, a relatively small varia
`tion in the displayed count over a period of several
`tempo beats would indicate to the musician that the
`tempo is relatively steady. An unsteady tempo would be
`reflected by a relaitively large variation in the displayed
`count over a period of several tempo beats. Therefore,
`the musician can tell by a glance at the display 52
`whether his play out of rhythm or his tempo is irregular.
`The device 10 is further advantageous in that it per
`mits a musician to pace himself and increase or decrease
`the music tempo at selected portions of the music
`played therefore providing the musician with ?exibility
`in his choice of tempo rates during play. This advantage
`can be readily appreciated when compared to known
`apparatus, such as click track recording, used to gener
`ate tempo beats which the musician, in turn, is expected
`to follow. The accuracy and relentlessness with which
`
`65
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`Yamaha Exhibit 1005 Page 7
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`

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`0
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`15
`
`35
`
`45
`
`25
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`5,036,742
`8
`7
`engageable with the skin of the drum, the housing
`such beats are generated prohibit any artisan variation
`assembly including sensing means carried by said
`of the tempo as music is played and is believed to add to
`end section of the upper portion of the housing to
`a “stiffness” in the sound of the music played. The de
`vice 10, in contrast, is responsive to the beats generated
`~ contact the skin of the drum when the housing is
`hanging from the rim of the drum, said sensing
`at the hand of the musician thereby permitting the musi
`means providing beat signals in response to the
`cian to vary the tempo of the music played in accor
`tempo beats generated by the drum;
`dance with his desires yet monitor at a glance the steadi
`computer means carried by the housing assembly, the
`ness of the tempo during selected portions of the music
`played.
`computer means being responsive to the beat sig
`The device 10 is silent in operation so as to not inter
`nals for measuring a time interval between succes
`fere with the music played and is lightweight, compact
`sive beat signals and calculating the number of
`and portable for ease of handling. The device 10 is
`beats per unit of time; and
`well-suited for practice applications to help the musi
`display means mounted on the upper portion of the
`cian improve his meter and for live and studio perfor
`housing assembly and associated with the com
`puter means for providing a visual indication of the
`mance applications.
`.
`The method of the invention includes the steps in
`calculated value of the number of beats per unit of
`volved in monitoring the tempo of music played with
`time.
`the snare drum 12. More speci?cally, the steps include
`2. The device in accordance with claim 1 wherein
`the sensing of each tempo beat, measuring the time
`said computer means includes means for generating a
`interval between successive tempo beats, dividing the
`preselected number of electrical pulses per unit time,
`interval into a time unit, i.e. minute, and visually indicat
`means for counting the pulses generated from the in
`ing the measured beats/time interval, i.e. beats/minute,
`stant one beat signal is received to the instant that an
`between each two successive beats.
`other beat signal is received, means for dividing the
`It will be understood that many modi?cations and
`pulses into a time unit, and means for sending the beats/
`substitutions can be had to the aforedescribed embodi
`time unit value in the form of a rate count to said display
`ments without departing from the spirit of the inven
`means at the sensing of said another beat.
`tion. For example, although the transducer 38 for sens
`3. The device in accordance with claim 2 wherein
`ing the tempo beats has been shown and described
`said display means is adapted to display the calculated
`above as mounted upon the box 16 of the device 10 of
`value in the form of a numerical value in terms of
`FIGS. 1-3, a beat-sensing transducer can be mounted
`beats/minute.
`remote of the box 16. To this end and with reference to
`4. A method of providing a display of the tempo of
`FIGS. 1 and 7, the device 10 includes a female recepta
`music played on a drum having an annular rim disposed
`cle 90 and 130 for receiving a plug-in jack 132, and the
`about a skin over the end of a drum shell, said method
`jack 132 is connected to a pickup transducer 134 by
`comprising the following steps:
`means of a relatively long wire 136. The device 10
`providing a housing assembly adapted to hang exter
`further includes appropriate electrical connections be
`nally from the rim of a drum with a hook-shaped
`tween the receptacle 130 and the computer means 40
`upper portion having an end section of hook
`permitting impulses generated by the transducer 134 to
`shaped upper portion of the housing disposable
`be received by the computer means 40. Hence, the de
`over and engageable with the skin of the drum, the
`vice 10 and transducer 134 of FIG. 7 collectively pro
`housing assembly including sensing means carried
`vide a tempo-monitoring assembly with remote pick-up.
`by the end section of the upper portion of the hous
`The FIG. 7 assembly is therefore suitable for tempo
`ing which is adapted to be disposed over the rim,
`monitoring applications in which it is desirable to posi
`the sensing means being adapted to contact the skin
`tion the indicator means, or more speci?cally, the count
`of the drum when the housing is hanging about the
`display remote of the instrument being played for easy
`rim of the drum, the sensing means being a trans
`viewing by a musician. In such an instance, the trans
`ducer capable of providing beat signals in response
`ducer 134 need only be positioned in close physical
`to the tempo beats of the drum, the housing further
`proximity to the sound-generating component of the
`including computer means responsive to the beat
`instrument for sensing the vibrations generated thereby.
`signals for measuring a time interval between suc
`Furthermore, although the device 10 of FIGS. 1-4
`cessive beat signals and for calculating the number
`has been shown and described as including a power
`of beats per unit of time, and the housing further
`source in the form of a battery 46, it will be understood
`including display means mounted on the upper
`that a device in accordance with the present invention
`portion of the housing and associated with the
`can be appropriately wired to accept power from an
`computer means for providing a visual indication
`electrical outlet through a power cord. Accordingly,
`of the calculated value of the number of tempo
`the aforedescribed embodiments are intended for the
`beats per unit of time;
`purpose of illustration and not as limitation.
`mounting said housing assembly externally from the
`I claim:
`rim of a drum by hanging said hook-shaped portion
`1. A device for providing a display of tempo of the
`thereof over said drum rim with the sensing means
`music played on a drum generating tempo beats, the
`in contact with the skin of the drum; and
`drum having an annular rim disposed about a skin over
`repeatedly hitting the skin of the drum to generate
`the end of a drum shell; said device comprising:
`a housing assembly adapted to hang externally from
`tempo beats within the skin of the drum the num
`ber of tempo beats per unit of time being displayed
`the rim of the drum and having a hook-shaped
`upper portion disposable over the rim, an end sec
`on a display means.
`tion of the upper portion being disposable over and
`I i
`
`55
`
`60
`
`65
`
`1
`
`$
`
`t
`
`Yamaha Exhibit 1005 Page 8