CN2112875U - Electronic metronome - Google Patents

Abstract

The utility model provides an electronic metronome used by exercisers learning vocal music and musical instruments and in particular by colonial music teaching. The electronic metronome is characterized in that the tempo synchronous starting circuit of functional operational keys is arranged. Compared with the electronic metronomes adopting the power switch to start, the electronic metronome also has tempo synchronous starting function except for the pausing function. The electronic metronome can emit tempos whose first beat is strong at any instant according to the users' requirement, and the tempos have accurate periods. The electronic metronome effectively solves the problem that the electronic metronome and the users synchronously start. The electronic metronome can be used in the colonial music teaching.

Description

Electronic metronome

The utility model relates to electronic metronome.

Electronic metronome is to grasp a kind of acousto-optic display device that beat and speed thereof design and produce for vocal music and musical instrument practitioner, especially the unification of in the group instruction of vocal music and musical instrument, using that can reach beat and speed, existing electronic metronome is generally by shell, time base circuit, frequency dividing circuit, the strong and weak separation circuit harmony light display device of clapping is formed, realize the beat starting with the power switch method of accessing, but exist two problems in actual use: the one, in frequency dividing circuit under the uncertain situation of counter status, during power connection, the first count of beat starting is not necessarily from strong beat, but at random; The 2nd, contain falling property element (oscillating capacitance) in the time base circuit, since the relation of RC time constant, the recurrence interval of bat after the recurrence interval of first bat always is not equal to.For example: if the metronome down time is brought into use after the length again, because capacitor charging time is longer, the recurrence interval that first bat can occur be longer than after the bat recurrence interval, if energized use again after the momentary pause, because of the charge affects that has not release to finish on the electric capacity, the recurrence interval of bat after the recurrence interval that first bat can occur is shorter than.The existence of these problems particularly makes troubles for the user in the group instruction.When using this electronic metronome, the user must pay close attention to electronic metronome, treats that it is stable and reach strong beat just to begin exercise constantly, and Here it is so-called electronic metronome is with use can not " synchronous initiation ".

The utility model " a kind of electronic metronome " can solve electronic metronome effectively and the user carves the synchronous initiation problem when needed, and can send initial first count by any moment that the user needs is strong beat, the beat that the cycle is accurate, acousto-optic shows.

For achieving the above object, the utility model employing scheme is in existing electronic metronome circuit one group of beat trigger circuit to be set, and this circuit is by (or on a two) button, diode, and resistor is formed.By the closure of button, its output terminal one is by being connected to the zero setting end of frequency dividing circuit every the stream diode, making frequency divider be in the zero setting state, is that strong beat is prepared for producing initial first count; The 2nd, by voltage divider, be connected to the input end of time base circuit every the stream diode, make it to force a last current potential that is higher than the threshold values that opens the door, the oscillating capacitance that promptly butts up against the time base circuit input end is clamped on certain voltage, overcoming the influence of RC time constant, thereby guarantee the accuracy of initial first count recurrence interval.Because the effect of trigger circuit when button unclamps, just can make electronic metronome and user's synchronous initiation, send initial first count and be strong beat, accurately, the beat of acousto-optic demonstration.

Below in conjunction with accompanying drawing and example, illustrate the utility model " a kind of electronic metronome ".

Fig. 1 is a kind of electronic metronome block diagram.

Fig. 2 is a kind of beat trigger circuit schematic diagram of electronic metronome.

Fig. 3 is a kind of electronic metronome external form synoptic diagram.

Fig. 4 a-c is a kind of beat trigger circuit oscillogram of electronic metronome.

A kind of electronic metronome is made up of beat trigger circuit, time base circuit, frequency dividing circuit, strong and weak bat separation circuit, gate light output circuit, gate sound generator, power amplifier harmony light display device among Fig. 1.Two output terminals of its beat trigger circuit connect the input end of time base circuit and the zero setting end of frequency dividing circuit respectively, with the synchronous initiation of control beat.

This electronic metronome in the course of the work, pulse by the time base circuit generation, send frequency dividing circuit to carry out the 2-6 frequency division, frequency division afterpulse signal is clapped through power and is sent into the acousto-optic driving circuit after separation circuit separates to carry out power amplifier big, promotes sound and light display spare at last and sends the cadence signal that acousto-optic shows.

Among Fig. 2, be the beat trigger circuit in the frame of broken lines, other is frequency dividing circuit IC1, time base circuit IC2, and beat selector switch K claps velocity modulation joint W, oscillating capacitance C _TIn the beat trigger circuit, AN1 is the synchronous initiation button, and AN2 is for suspending the self-locking button, and two keys are for being connected in parallel.When AN1 or AN2 connection, power supply is by its contact, via R1, R _T, the voltage divider that is composed in series of R2, pass through R _TThe adjustment of movable contact, to be connected to the time base circuit input end through isolating diode D2 a little more than the open the door dividing potential drop of threshold values of time base circuit IC2, make it be in the triggering state, another Lu Zejing diode D1 is connected to the zero setting end of frequency dividing circuit IC1, makes it be in the zero setting state.

Below in conjunction with the trigger circuit oscillogram of Fig. 4 a-e, in the design of electronic metronome circuit, counter output state Q0 is strong beat, Q1, Q2, Q3 ... it then is weak beat.Under static situation, counter not necessarily is in the Q0 state, thus first count not necessarily strong beat begin; The 2nd, owing to contain falling property element electric capacity G in the time base circuit _TStored charge is inconsistent, and the long period, electric charge was zero on the electric capacity when stopping using; When suspending in (during Fig. 4 a t=to) use, then electric charge is at random on the electric capacity; Behind (during Fig. 4 b t=ts) thereby the power connection, can occur the first count recurrence interval be longer than or be shorter than after the bat recurrence interval (Fig. 4 a To＞T, Fig. 4 b Ts＜T) is clapping speed when low, this phenomenon is particularly evident.

When AN presses, the one, supply voltage is added in through diode D1 and makes counter zero setting on the IC1, makes it to be in the Q0 state, guarantees that the beginning first count must be strong beat; The 2nd, supply voltage is added in the IC2 input end after adjusting dividing potential drop, and no matter this moment is electric capacity G _TWhat value last current potential be in and it be clamped on Vp, because Vp＞Vw(Vw is the threshold values that opens the door of time base circuit) time base circuit is in the triggering state, and (A point among Fig. 4 c) needs only AN and do not discharge electric capacity G _TOn current potential protection Vp constant.Fig. 4 d is the anti-phase waveform of time base circuit output, is the trigger pulse of counter, and positive transition is along triggering effectively.Press AN but work as t=ts, the H-K positive transition, because the existence of zero setting signal, counter still is in the Q0 state not to be changed.(Q0, Q1 among Fig. 4 d ... Deng symbol is corresponding counter status).When AN discharges, Fig. 4 C(t=t _F) electric capacity G _TCurrent potential quickly falls to C(t=t ' by B _F), reach the time base circuit threshold values V that closes the door _FThe time base circuit output state overturns immediately, and the negative hopping edge of M-N can not make the counter status conversion among Fig. 4 d, so counter status still is Q0, meanwhile make it to produce one through differential shaping circuit and drive the pulse signal (Fig. 4 e) of acousto-optic circuit, and guarantee that first count is strong beat by negative hopping edge.P-R is the positive transition edge among Fig. 4 d, and counter status is converted to Q1, then is weak beat, and (Q0 is strong beat in the circuit design) is a series of with headed by the strong beat according to analogizing, and the clock pulse row that the cycle equates just produce.

The operating process of this electronic metronome is as follows: when (see figure 3) needs electronic metronome work as the user, should (this switch can be established one to six bat with beat selector switch (4), depend on the needs) and tempo adjusting knob (5) (this knob can be put per minute 40-208 and clap, need to decide on melody) place desired location, connect the power switch (3) of band volume adjusting then and volume is transferred to the appropriate location, this moment, electronic metronome can send the beat that acousto-optic shows, but can there be aforesaid problem in the initial moment, promptly first count not necessarily the recurrence interval of strong beat and first count be longer than or be shorter than after recurrence interval of bat.In order to make electronic metronome and user's synchronous initiation, can push button (1) is that AN1 frequency divider this moment is in the zero setting state, and time base circuit is in the triggering state.When AN1 discharged, electronic metronome sent the beat that first count is strong beat, the cycle is accurate, acousto-optic shows immediately.Shell (6) is used plastic injection-moulded or sheet metal is stamped to form.

Button (2) is that the AN2 effect is identical with AN1, and just this button is the self-locking button.In teaching process, as need pause long period instruction, then only need press this key makes its self-locking, and electronic metronome just quits work, and when instruction finishes, makes its release by this key again, gets final product synchronous initiation.

This electronic metronome can be made portable for individual's exercise use, also can make desk-top for particularly group instruction use of individual.

Claims (2)

1, a kind of electronic metronome is made up of shell, time base circuit, frequency dividing circuit, strong and weak bat separation, gate light output circuit, gate sound generator, power amplifier harmony light display device, it is characterized in that having the beat trigger circuit: form starting (often opening) button AN by (or two) button, diode, a resistor ₁With time-out (self-locking) button AN ₂Parallel connection, one is terminated at power supply, and the other end divides two-way: a routing resistance device R ₁, R _T, R ₂Be connected into bleeder circuit, R _TThe movable contact warp that is is every stream diode D ₂Be connected to time base circuit (IC ₂) input end, the two tunnel through every stream diode D ₁Be connected to frequency dividing circuit (IC ₁) the zero setting end.

2, a kind of electronic metronome according to claim 1 is characterized in that R1, R in the beat trigger circuit _T, R2 series connection bleeder circuit R _TIt is adjustable resistor.

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