CN86201615U - Simple music instrument with various dynamic acoustic effect structure - Google Patents

Abstract

The utility model discloses a simple music instrument with a various dynamic acoustic effect structure, using a dynamic filter circuit composed of a small amount of devices to generate various dynamic acoustic effects. The utility model is characterized in that the power amplifying pole of the electronic organ is directly added with a feedback network having a dynamic frequency characteristic, the network contains at least one controlled resistance device, and the music instrument can receive the variable voltage signals of various functions so as to generate various dynamic acoustic effects. Due to having simple circuit, the music instrument can be used for producing a simple electronic organ with low cost and various tone qualities.

Description

Simple music instrument with various dynamic acoustic effect structure

The utility model is one kind of multiple dynamic sound effects electronic musical instruments simple in structure, is specially adapted to the technical field of simple and easy electronic musical instrument and toy electronic musical instrument.

Electronic musical instrument can produce many very uniquenesses and the tone color of illusion color, for example " sound ", " favoring with sound ", " mew sound ", " sound of singing ", " universe sound " etc. are arranged.But, so that also be only limited in high-grade mellotron and electronics sound phonosynthesis device and use up to the circuit of this class tone color of present realization more complicated all.Although also there are some to simplify circuit, realize the necessary voltage controlled filter of these sound effects but still used special active device or circuit to constitute.For example: used five integrated circuit to achieve the goal at the voltage controlled filter described in the U.S. Pat 3919648.Jap.P. JP55-40879 has used the active circuit of special amplifying unit as kinetic filter.

The purpose of this utility model is on the basis of Simple Electronic Organ, increases a small amount of components and parts and just can constitute a kind of circuit of electronic organ that can produce multiple dynamic spectrum sound effect, increases its tone color kind with the tone color quality that improves Simple Electronic Organ, lowers its relative cost.

For achieving the above object, taked directly to add the method for dynamic feedback network at the mellotron power-amplifier stage.This network can be made of with T shape, double T shape or π shape structure components and parts such as resistance, electric capacity, transistor, diode, photosensitive device, potentiometers, and its dynamic perfromance is subjected to the control of signal processing circuit among electronic musical instrument keying signal and the present invention and works.

Be that example illustrates its principle of work to scheme (1) below, IC1 is a temperament generator among the figure.Its signal adds to the in-phase input end of power amplifier IC2 from its SC1 end output.Signal after the amplification adds to loudspeaker y pronunciation from the output terminal SC2 of IC2.Meanwhile between the inverting input of IC2 and output terminal, be added with the dynamic frequency characteristic feedback network that capacitor C 1, C2, C3 and resistance R 1, R2 and transistor BG form, to form that centre frequency can be subjected to external signal and the dynamic bandpass filtering effect controlled.Because the resistance to earth between C2 and the C3 is to use the equivalent internal resistance of transistor BG to replace, so when being added on the base stage of BG with difform signal voltage, the internal resistance of BG just produces corresponding regular the variation, thereby make the centre frequency of this dynamic bandpass filter also do corresponding variation, so various special dynamic spectrum sound effects in loudspeaker, have been sent.

When pressing key K, " keyed pulse " signal of temperament generator output is admitted among the control waveform treatment circuit BC, and it is become various function waveforms.Can be changed into the voltage waveform of logarithmic decrement and logarithmic growth in this example.If place position a will be in low resistive state when then transistor BG is flat switch S.When pressing a certain key, the internal resistance of BG will become suddenly greatly, correspondingly then diminish gradually.This variation will cause the centre frequency of dynamic bandpass filter to shift to most significant end gradually by least significant end, just form typical " sound " effect.

Can prove equally, when S is in the b position, will produce typical " favoring with sound " effect.

Fig. 2 is that the applicant thinks and realizes one of best method of the present utility model.When pressing arbitrary key, this musical note integrated circuit (IC) can then be pressed the change in voltage characteristic that logarithmic parabola rises in its envelope end EN output drop suddenly, so only just can realize out the dynamic tamber effect of many kinds with three transistors.

Be depicted as the control waveform treatment circuit among Fig. 2 in the frame of broken lines.As switch S 1 and S3 during all in a position separately, can play out and play tone color, its effect is by the value decision of R3.When the AN1 that closes plays, behind the circuit " pointization " that R4, R5 and C4 form, be added to the base stage of transistor BG3 again by R6 from the waveform of the EN end output of IC1, make the increase quickly that diminishes suddenly then of the equivalent internal resistance of BG3.This variation just makes IC2 export the sound of " mew mew " or " talking endlessly ".

Equally as can be known, when pressing the button AN2, AN3, AN4, can obtain other special tamber effect.When S3 being placed b when end because C6 no longer will become than " point " with the envelope waveform of the EN end output of C5 IC1 in parallel, so respectively by on can obtain another during AN1～AN4 and organize dynamic tone color.

When switch S 1 during at position b, the waveform of the EN of IC1 end output will reappear on the emitter resistance R9 of BG1 by C7R7, R8, and the equivalent resistance of control BG2, thereby, make IC2 output " " audio fruit.If again S2 is dialled at position b, so then because the integral action of the circuit that R7 and C8 form has relaxed the forward position of envelope voltage has obtained " many, many " at the output terminal of IC2 tone color.

Circuit form in change Fig. 2 dotted line can obtain more tone color and change.

The utility model is compared with existing dynamic tone color formation method, and following advantage is arranged:

1, significantly saved the quantity of active device, Simple Electronic Organ and children electronic organ have then been seemed excellent in favourable.

2, because dynamic feedback realizes that in the power amplifier level and power discharging IC has higher full gain and its output impedance very low, thus make that the bandpass filter of method formation has higher Q value thus, thus strengthened dynamic tamber effect.

3, exempted because the noise that increase brought of active device makes mellotron that more pure and beautiful tone color be arranged.

4, the circuit that adopts this method to constitute can be produced Simple Electronic Organ with low cost.

If 5 are changing in performance or replacing and press AN1～AN4, then can play out the tone color that promptly changes in wink or play out rigoroso certain tone color.

When 6, playing, can cultivate the ability that player's two hands are used simultaneously, and can show different players' artistic skills level with the 5th described mode.

Fig. 3 is that the applicant thinks two of the best way that realizes this utility model. The place that Fig. 3 is different from Fig. 2 only is to have saved the transistor BG2 of Fig. 2, and the circuit of Fig. 2 BG1 is changed into the inverting amplifier mode of Fig. 3 BG1. Therefore, can make 180 ° of the control voltage paraphase of the EN end output of IC, reach the purpose of generation " sound " effect. Just the same when one group sound effect and Fig. 2 correspondence position of S1 during in the b position, no longer repeat.

Claims (3)

1, a kind of multiple dynamic sound effect electronic musical instrument simple in structure that voltage controlled filter is housed that relates to is characterized in that adding dynamic feedback network that frequency characteristic is arranged and the pushbutton switch of controlling this network dynamics in power amplification.

2, electronic musical instrument according to claim 1 is characterized in that the dynamic feedback network is to be made of with T shape, double T shape or towering l network form components and parts such as resistance, electric capacity, transistor, diode, photosensitive device, force-sensing parts, potentiometers.

3, electronic musical instrument according to claim 1 is characterized in that determining the tone color variation of playing style to be controlled by pushbutton switch.