CN2086955U

CN2086955U - Multifunctional microphone

Info

Publication number: CN2086955U
Application number: CN 91203952
Authority: CN
Inventors: 蔡敏端; 洪悯萱; 麦兆海
Original assignee: ZHONGLU ELECTRONICS FACTORY SH
Current assignee: ZHONGLU ELECTRONICS FACTORY SH
Priority date: 1991-03-14
Filing date: 1991-03-14
Publication date: 1991-10-16

Abstract

The utility model relates to a multifunctional mouthpiece which is composed of a transducer, a prepositive amplifier circuit, a band limiting low pass filtering circuit, a charge coupling audio frequency delay circuit of bucket-chain type, a clock low pass filtering circuit, a feedback circuit, a clock circuit, a frequency modulation transmitting circuit, a direct current power supply, a mouthpiece shell body, a mouthpiece wire mesh, a supporting frame, etc. Because the advanced charge coupling audio frequency delay circuit of bucket-chain type is adopted and delay time is adjustable, the utility model generates full sound, has space-time and plastic effect, and has a plurality of functions of mixed reverberation, reverberation, malformed reverberation, etc. The utility model has the advantages of reasonable circuit, novel structure, simple operation and easy regulation, and is an ideal multifunctional mouthpiece.

Description

Multifunctional microphone

The utility model relates to a kind of microphone, particularly a kind of multifunction microphone.

In the prior art, existing multiple wired, wireless microphone, but the sound that the common weakness of these microphones is microphones itself to be sent is thin, dull, tone color is relatively poor, and lack time, the space multistory sense of sound.Even the sound that the stereophony microphone sends also has only the third dimension of a direction and lacks the sound field sense, that is to say and listen hearer's impression less than the sort of telepresenc in the music hall scene.Disclose a kind of multifunction microphone in the Chinese patent (patent No. 89202220), its objective is the sound generating echo that makes performer one people performance or produce the effect that the many people of simulation are singing.And the notion of the mechanism of echo in acoustics is: when the people hears two same sound but has the time difference that surpasses 50ms between the two, brain just thinks that they are two independently sound, and second sound is interpreted as the echo of first sound, because this microphone is intended to form clearly echo or forms distinguishable many people singing effect, by its purpose and used device analysis, the time difference between two signals that this microphone produces is enough big.Because the time difference is bigger, though Echo is obvious, acoustic phase ratio original with regard to the tone color of each sound itself there is no remarkable improvement.

The purpose of this utility model be to avoid above-mentioned the deficiencies in the prior art part and provide a kind of and have reverberation, echo, multiple effect such as reverberation, and strengthened the relief multifunction tube of sound space-time.

The purpose of this utility model can reach by following measure: the utility model comprises transducer, pre-amplification circuit, modulating emission circuit, DC power supply, the microphone woven wire, support, the microphone body, it is characterized in that: also have the frequency band limits low-pass filter circuit, bucket chain formula electric charge coupled mode audio delay circuit, the clock low-pass filter circuit, feedback circuit, clock circuit, modulating emission circuit is directly delivered in the output one tunnel of transducer, another road is via pre-amplification circuit, the frequency band limits low-pass filter circuit is delivered to bucket chain formula electric charge coupled mode audio delay circuit, the output of bucket chain formula electric charge coupled mode audio delay circuit is also delivered to modulating emission circuit after via the clock low-pass filter circuit, bucket chain formula electric charge coupled mode audio delay circuit is delivered in the output of clock circuit in addition, and the output of clock low-pass filter circuit is sent the frequency band limits low-pass filter circuit back to by feedback circuit.Potentiometer in the pre-amplification circuit is fixed together by potentiometer fixed head and microphone body, and the potentiometer adjustable plate connects with the support glue of fixing the microphone woven wire, and the center adjustment bar of potentiometer is fixed in the centre bore of potentiometer adjustable plate.Transducer passes through R22, the base stage of BG5 is joined in C18 and the frequency modulation generation circuit, and join by the base stage of BG1 in C1 and the pre-amplification circuit, the BG1 base stage, be connected to potentiometer between the collector electrode, its collector electrode passes through C2, R4, the base stage of BG2 is joined in R6 and the frequency band limits low-pass filter circuit, the emitter-base bandgap grading of BG2 joins by 3 pin of integrated circuit (IC) 1 in C6 and the bucket chain formula electric charge coupled mode audio delay circuit, 2 of IC1,4,6 pin respectively with clock circuit in IC2 2,8,4 pin join, 7 of IC1, between 8 pin and be connected to potentiometer W1, mid point output the passing through C9 of W1, R14, the base stage of BG3 is joined in R16 and the clock low-pass filter circuit, the emitter-base bandgap grading of BG3 passes through R18, R19, the base stage of R20 and BG4 is joined, the emitter-base bandgap grading of BG4 is divided into two-way after by C17, the C18 of leading up to connects the base stage of BG5, and R5 is passed through on another road, C3, R6 connects the base stage of BG2.IC1 in the bucket chain formula electric charge coupled mode audio delay circuit adopts integrated circuit MN3207.

According to psychological acoustics principle analysis, when ear receives two same sound (waveform is identical with amplitude), but time difference each other during less than 10ms, brain thinks that they are same sound and the difference of non-life period; But when the time difference is 10～50ms, though acoustically can feel delay sound existence but still feel that this sound derives from and do not postpone sound source that delay sound has just been strengthened the loudness of sound, makes tone color become plentiful abundant, increased the melodious composition of sound, Here it is so-called reverberation effect.And when time difference during greater than 50ms, brain just determines that they are two independently sound, and acoustically delay sound has just become echo or be called to echo; If comprise in the signal when repeating repeatedly sound that intensity weakens gradually then can form reverberation.

Because people's brain always is judged as main sound source with the signal of receiving for the first time, and determine the locus of sound source with the notion of the velocity of sound, size of delaying time in these therefore above-mentioned mixed signals and the difference of respectively mixing the composition situation of composition will make brain that distance between sound source and sound field situation are produced certain illusion, simulate different sound source scenes so can utilize change to delay time with the ratio of respectively mixing between composition, the Principles of Acoustics of every function that this microphone will realize that Here it is.

The utility model has adopted bucket chain formula electric charge coupled mode audio delay device (model MN3207), and its, excursion (generally can reach 10ms～100ms) greatly time of delay.When time-delay during greater than 50ms, can realize echo function, and when delay time less than or when approaching 50ms, can realize functions such as reverberation, reverberation.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is a functional-block diagram of the present utility model;

Fig. 3 is an electrical schematic diagram of the present utility model.

The utility model is described in further detail below in conjunction with accompanying drawing (embodiment):

With reference to Fig. 1, Fig. 2, the utility model is made up of transducer 1, pre-amplification circuit 2, frequency band limits low pass filter 3, bucket chain formula electric charge coupled mode audio delay circuit 4, clock low-pass filter circuit 5, feedback circuit 6, clock circuit 7, modulating emission circuit 8, DC power supply 9, potentiometer fixed head 10, potentiometer adjustable plate 11, microphone woven wire 13, support 14, microphone body 15 etc.

Among Fig. 1, potentiometer 12 in the pre-amplification circuit 2 is fixed together by potentiometer fixed head 10 and microphone body 15, potentiometer adjustable plate 11 connects with support 14 glue of fixing microphone woven wire 13, and the center adjustment bar of potentiometer 12 is fixed in the centre bore of potentiometer adjustable plate 11.So scalable potentiometer 12 when regulating microphone woven wire 13, adjustable range is by two pin restrictions on the potentiometer fixed head 10.In the

microphone body

15,16 is the wiring board storehouse in addition, and 17 is battery compartment.

Among Fig. 2, constitute adjustable electronics sound mixer by frequency band limits low-pass filter circuit 3, bucket chain formula electric charge coupled mode audio delay circuit 4, clock low-pass filter circuit 5, feedback circuit 6, clock circuit 7.Its effect is the space-time third dimension that strengthens sound, improves tone color.Audio signal is mixed through the input that the time delayed signal part that delay unit produced is fed back to frequency band limits low-pass filter circuit 3, so the output of clock low-pass filter circuit 5 becomes the effect of a certain signal superposition with a timing difference and attenuation coefficient that is input signal and its derivation; As if this process repeated multiple times, then become total effect of a plurality of signal superpositions.

With reference to Fig. 3, IC1(MN3207) and peripheral cell form bucket chain formula electric charge coupled mode audio delay circuit 4; IC2 and peripheral cell clock circuit 7; Their common electronic delay circuits of forming.Thereby the capacitor C 8 of regulating between 5,7 pin of IC2 just can change the time of delay that clock frequency changes circuit, between 7,8 pin of IC1 with potentiometer W1 connection and to export from its centre cap be intensity and feedback quantity in order to reduce distortion and to regulate time delayed signal.

BG2, BG3 and BG4 and on every side element form three grades of active low-pass filters.Wherein BG2 is a frequency band limits low-pass filter circuit 3, the superfluous signal beyond the elimination bucket chain formula electric charge coupled mode audio delay circuit frequency band; BG3, BG4 form clock low-pass filter circuit 5, are used to eliminate the noise that clock signal is brought.Feedback signal is mixed through the base stage that C17, R5, C3, R6 send back to BG2 from the taking-up of BG4 emitter, and the reverberation signal that the formation amplitude is decayed is gradually delivered to the usefulness that the confession of A point mixes the back transmission among the figure with original sound.

The signal of this microphone is the first degenerative pre-amplification circuit 2 of being with through elements such as BG1 composition before entering delay circuit.Adjusting is connected across the base stage of BG1 and the potentiometer 12(between the collector electrode realizes by the wire guard 13 that rotates microphone) can change its feedback factor, the signal strength signal intensity that outputs to delay circuit can be changed in sizable scope, its result can regulate the reverberation intensity of mixing sound circuit output signal and perdurabgility thereof in bigger scope, make to listen the hearer and can experience change of sound field significantly.

This circuit also makes input signal directly enter frequency modulation emission electricity 8 through resistance R 22, and its effect is: the bad coupling that (1) enlarges the dynamic range of microphone and avoids time delayed signal that the sound film is produced.(2) fidelity of assurance output signal high-frequency tube makes sound can not become dull because of the restriction of bucket chain formula electric charge coupled mode audio delay circuit frequency band.(3) eliminate the sound hysteresis, singer and audience's distance strengthens on-the-spot sense true to nature closely.(4) the proportion adjustable relation of outstanding sound source primary signal and mixed signal strengthens listening the scene impression of hearer to the simulation sound field of different sizes.

Modulating emission circuit 8 is made of BG5, BG6 and peripheral cell thereof.Element was formed the common base ultra-high frequency generator around BG5 reached, and the variation of input audio signal intensity causes the variation of BG5 collector junction junction capacitance, thereby had changed the frequency of oscillation of load along the loop that shakes, and realized frequency modulation(FM).This FM signal is fed to antenna L2 by transformer coupled after BG6 amplifies.

Transducer 1 is made of moving coil type microphone sound film and annex thereof.During real work, the audio signal of audio producing is divided into two the tunnel, the one tunnel and directly enters modulating emission circuit 8 through resistance R 22; Another road is through electronics sound mixer (being made up of elements such as IC1, IC2, BG2, BG3, BG4), formation has the mixed signal of effects such as reverberation, reverberation, this two road signal is delivered to modulating emission circuit 8 as modulation signal jointly, launches with FM signal at last.

If, just can form multi-functional wired, wireless two-way microphone with the position that the two ends of a phono connector are received A point and " ⊥ " among the figure respectively with voice-frequency cable.

The utility model has following advantage compared to existing technology

1. adopted bucket chain type electric charge coupled mode audio delay device, and its time delay is adjustable, makes the several functions such as microphone possesses reverberation, echoes, reverberation, and the sound that sends is plentiful simple and honest, the space-time third dimension is arranged, thereby can simulate the different space acoustics such as the hall, mountain valley.

2. circuit rationally, novel structure, use be simple, easy to adjust, when utilizing this microphone and common stereo set to sing, can give the singer and listen the hearer and feel with the on-the-spot sound equipment of placing oneself in the midst of different music environments.

Claims

1, a kind of multifunction microphone, comprise transducer 1, pre-amplification circuit 2, modulating emission circuit 8, DC power supply 9, microphone woven wire 13, support 14, microphone body 15, it is characterized in that: also have frequency band limits low-pass filter circuit 3, bucket chain formula electric charge coupled mode audio delay circuit 4, clock low-pass filter circuit 5, feedback circuit 6, clock circuit 7, modulating emission circuit 8 is directly delivered in the output one tunnel of transducer 1, another road is via pre-amplification circuit 2, frequency band limits low-pass filter circuit 3 is delivered to bucket chain formula electric charge coupled mode audio delay circuit 4, the output of bucket chain formula electric charge coupled mode audio delay circuit 4 is also delivered to modulating emission circuit 8 after via clock low-pass filter circuit 5, bucket chain formula electric charge coupled mode audio delay circuit 4 is delivered in the output of clock circuit 7 in addition, and the output of clock low-pass filter circuit 5 is sent frequency band limits low-pass filter circuit 3 back to by feedback circuit 5.

2, microphone according to claim 1, it is characterized in that: the potentiometer 12 in the pre-amplification circuit 2 is fixed together by potentiometer fixed head 10 and microphone body 15, potentiometer adjustable plate 11 connects with support 14 glue of fixing microphone woven wire 13, and the center adjustment bar of potentiometer 12 is fixed in the centre bore of potentiometer adjustable plate 11.

3, microphone according to claim 1, it is characterized in that: transducer 1 passes through R22, the base stage of BG5 is joined in C18 and the frequency modulation generation circuit 8, and join by the base stage of BG1 in C1 and the pre-amplification circuit 2, the BG1 base stage, be connected to potentiometer 12 between the collector electrode, its collector electrode passes through C2, R4, the base stage of BG2 is joined in R6 and the frequency band limits low-pass filter circuit 3, the emitter-base bandgap grading of BG2 joins by 3 pin of integrated circuit (IC) 1 in C6 and the bucket chain formula electric charge coupled mode audio delay circuit 4,2 of IC1,4,6 pin respectively with clock circuit in IC2 2,8,4 pin join, 7 of IC1, between 8 pin and be connected to potentiometer W1, mid point output the passing through C9 of W1, R14, the base stage of BG3 is joined in R16 and the clock low-pass filter circuit 5, the emitter-base bandgap grading of BG3 passes through R18, R19, the base stage of R20 and BG4 is joined, the emitter-base bandgap grading of BG4 is divided into two-way after by C17, the C18 of leading up to connects the base stage of BG5, and R5 is passed through on another road, C3, R6 connects the base stage of BG2.

4, microphone according to claim 1 is characterized in that: the IC1 in the bucket chain formula electric charge coupled mode audio delay circuit 4 adopts integrated circuit MN3207.