CN2118344U

CN2118344U - Tune pitching apparatus for music instrument

Info

Publication number: CN2118344U
Application number: CN 92222088
Authority: CN
Inventors: 孟维平; 仲维辛; 陆舟
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-05-21
Filing date: 1992-05-21
Publication date: 1992-10-07

Abstract

The utility model relates to a tune pitching apparatus for music instruments, comprising a single chip computer, an amplifying and shaping circuit, an audio output circuit, a memory unit, a power supply unit and an instrument shell, wherein, the amplifying and shaping circuit is composed of an amplifier, a shaper and an inverter. Music signals inputted from a microphone are respectively connected with two interruption feet of the single chip computer through the amplifying and shaping circuit. A data display circuit adopts LED nixie light display. The memory unit is provided with programs, tempos and standard-tune high data of various music instruments. The single chip computer is connected with a functional keyboard. The power supply unit is provided with an under-voltage display circuit. The utility model can display deviation values between phonetic laws and standard music pitches of various music instruments, and tune names of 88 keys of a piano. The utility model has functions of a metronome, has advantages of wide test diapason, visual accurate display and simple operation, and is suitable for tune pitching for music instruments.

Description

Tune pitching apparatus for music instrument

The utility model belongs to a kind of musical sound test adjusting gear that micro computer is combined with music technology.

The tuner of musical instrument is the high work of technical requirement, is all finished by the professional in the past.Along with development of computer, micro computer musical sound testing tool has appearred, KORA AT-12 musical sound tester as Japan, its composition frame chart is seen Fig. 1, it amplifies the musical sound of input and sends into audio decoder after shaping and compare with the standard fundamental tone, musical alphabet diode displaying in the comparative result, deviation is then indicated with pointer.But this tester can only be surveyed 4 group of 12 scale totally 48 sounds, only adopts twelve-tone equal temperament during tuning, so do not meet auditory perception, the demonstration of its musical alphabet and deviation is accurately not directly perceived inadequately yet in addition.

The purpose of this utility model is a kind of tuning acoustic wide ranges of design, and available multiple rule system tuning, output show accurate and visual high-performance musical sound test adjusting gear.

Above-mentioned purpose realizes in the following manner: a kind of musical instrument temperament instrument, it comprises single-chip microcomputer, inserts the amplification and rectification circuit of single-chip microcomputer signal input part, the data display circuit that picks out from single-chip microcomputer and the memory and the power unit of audio output circuit, storage program and data.Wherein

A, amplification and rectification circuit are made up of amplifier, reshaper, phase inverter and half value voltage generator, and the output of half value voltage generator is connected to the in-phase input end of amplifier, reshaper, phase inverter respectively.Note signal connects amp.in through microphone, and the output of amplifier connects the inverting input of reshaper, and the output one tunnel of reshaper meets the INT of single-chip microcomputer ₀Pin, another road connects the inverting input of phase inverter.The output of phase inverter meets the INT of single-chip microcomputer ₁Pin;

B, data display circuit are made up of the three-port variable voltage regulator that SI PO shift register, LED charactron have reached the current-limiting resistance effect;

C, single-chip microcomputer are connected to function selection keyboard;

D, power unit contain the undertension display circuit;

E, in memory storage as the pitch of piano 88 keys and natural deepening rule, reach data such as electric guitar, electric bass, stringed musical instrument, idiophonic pitch.

Because the utility model is core with the single-chip microcomputer, the tone data of multiple beat data of storage and musical instrument in memory, can select in the memory corresponding data to measure and compare by keyboard to different musical instruments, and its result is delivered to charactron show therefore to have the test tone field width, to show advantages such as accurate and visual, easy to use, function is many.

Below in conjunction with description of drawings embodiment of the present utility model.

Fig. 1 is the composition frame chart of Japanese KORA AT-12 musical sound tester

Fig. 2 is the composition frame chart of the utility model embodiment

Fig. 3 is the utility model embodiment composition frame chart

Fig. 4 is the outside drawing of the utility model embodiment

Musical instrument temperament instrument shown in Figure 2, the data display circuit 3 and audio output circuit 4, memory 5 and the power unit 6 that comprise single-chip microcomputer 1, be connected on the amplification and rectification circuit 2 of single-chip microcomputer signal input part, pick out from single-chip microcomputer, the pitch of computer program stored and piano 88 keys in the memory 5 of getting in touch by address latch 27 and single-chip microcomputer 1 wherein, the tone data of multiple musical instruments such as natural deepening rule and electric guitar, electric bass, stringed musical instrument, percussion instrument.

As can be seen from Figure 3, amplification and rectification circuit 2 is made up of the amplifier 8, reshaper 9, phase inverter 10 and the half value voltage generator 11 that adopt the LM324 amplifier, the half value voltage generator is output as 2.5V and is connected to the in-phase input end of amplifier 8, reshaper 9 and phase inverter 10 respectively, the latter is worked in ± 2.5V dual power supply mode, and (amplifier with dual power supply mode work limitation fruit better, the in-phase end that be equivalent to amplifier this moment for " ", ground is " negative supply ".）。The input of amplifier 8 connects microphone 19 among the figure, and output connects the inverting input of reshaper 9, and the output one tunnel of reshaper meets the INT of single-chip microcomputer 1 ₀Pin, another road connects the inverting input of phase inverter 10, and the output of phase inverter 10 meets the INT of single-chip microcomputer 1 ₁Pin.Here single-chip microcomputer adopts the 80C31 of CMOS technology.

As can be seen from Figure 3, data display circuit 3 is made of SI PO shift register 12, LED charactron 13 and LN317 three-port variable voltage regulator 14, the input of three-port variable voltage regulator 14 connects+the 5V power supply, output transfers to+and 2.4V connects the anode of LED charactron 13, can save current-limiting resistance like this, SI PO shift register 12 adopts CD4094, can reduce the demand to the single-chip microcomputer output port like this, and its pin DATA, CLOCK and STB draw the pin P from single-chip microcomputer respectively _3,0, P _3,1And P _3,4(, then need take 8 ports of single-chip microcomputer) if employing is incorporated into and gone out register; In addition, single-chip microcomputer also is connected to 4 * 4 keyboards 7 that can select instrumental function, and 4 bit lines of this keyboard and 4 utmost point alignments are connected to the P of single-chip microcomputer 1 _1,0--P _1,7Pin.Power unit 6 adopts two cover power supply plans: the one, send through 7805 three terminal regulators by external 9 volts of direct supplys; The 2nd, use reserve battery.Power unit 6 also is connected to the undertension display circuit 15 that is made of transistor switching circuit 23, and voltage signal is added in this pipe base stage, triode be attempted by the 5V both ends of power after light emitting diode 21 is connected.This triode and light emitting diode all end under the normal condition, and when voltage reduced, the transistor base current potential decreased, so the triode conducting is lighted as light emitting diode 21 conducting immediately that undertension shows.In the audio output circuit 4 by the P of single-chip microcomputer _3,5The audio frequency output that pin is sent is delivered to loudspeaker 20 and output plughole 24 through volume control potentiometer 23 after being driven by power tube again.

In Fig. 4, the profile of this temperament instrument is a box of being made up of lid 16, box wainscot 17 and box body 18, the temperament instrument circuit places in the box body 18, LED charactron 13, keyboard 7, microphone 19 loudspeakers 20, external direct current power supply jack 25, signal input jack 26, the audio output jack 24 of drawing from the temperament instrument circuit are housed on the box wainscot 17, and audio frequency output volume adjusting device 23, undertension show light emitting diode 21 and power switch 22.

Principle of work of the present utility model is: the musical sound that has harmonic wave is sent into amplifier 8 amplifications by microphone 19, again after reshaper 9 shapings, amplitude peak fundamental tone ripple in the musical sound has just become square wave, this square wave one tunnel is through the interruption pin INT of single-chip microcomputer 1, another road is sent into one and is had the anti-phase square wave of phase differential with above-mentioned square wave to interrupting pin INT through phase inverter 10, and what single-chip microcomputer was received like this is exactly the recurrent pulse that reflects the musical sound first-harmonic.After single-chip microcomputer INT pin is received signal, promptly start first timer in the sheet, after the INT pin is received signal, just start in the sheet second timer when one-period finishes, just with the value of these two counters according to survey all methods calculate the periodic width of recurrent pulse, select from memory, to take out corresponding standard musical alphabet according to prior keyboard then, with this musical alphabet and actual measured value therewith the difference of musical alphabet import data display circuit in the lump and go to show.Can select by keyboard in addition, characterize the metronome sound of beat and show this tempo from audio output circuit output is multiple.

But the various sound equipments of the utility model test frequency between 20-10000HZ, degree of accuracy is 1%.

Claims

1, a kind of musical instrument temperament instrument, the amplification and rectification circuit 2 that comprises single-chip microcomputer 1, access single-chip microcomputer 1 signal input part, the data display circuit 3 that picks out from single-chip microcomputer and the memory 5 and the power unit 6 of audio output circuit 4, stored data and program, described musical instrument temperament instrument profile is a box of being made up of lid 16, box wainscot 17 and box body 18, temperament instrument circuit plate places in the box body 18, microphone 19, loudspeaker 20 and power switch 22 are housed on the box wainscot 17, it is characterized in that:

A, described amplification and rectification circuit 2 are made up of amplifier 8, reshaper 9, phase inverter 10 and half value voltage generator 11, the output of half value voltage generator 11 is connected to the in-phase input end of amplifier 8, reshaper 9 and phase inverter 10 respectively, the input of amplifier 8 connects microphone 19, output connects the inverting input of reshaper 9, and the output one tunnel of reshaper 9 is connected to the INT of single-chip microcomputer 1 ₀Pin, another road connects the inverting input of phase inverter 10, and the output of phase inverter 10 meets the INT of single-chip microcomputer 1 ₁Pin;

B, described data display circuit 3 are made up of the three-port variable voltage regulator 14 that SI PO shift register 12, LED charactron 13 have reached the current-limiting resistance effect;

C, single-chip microcomputer 1 are connected to the keyboard 7 that can select instrumental function;

D, power unit 6 contain undertension display circuit 15;

The light emitting diode 21 of e, LED charactron 13, keyboard 7 and instructed voltage deficiency all is contained on the box wainscot 17.

2, musical instrument temperament instrument according to claim 1 is characterized in that described keyboard 7 is 4 * 4 keyboards, and its bit line and alignment are connected to the P of single-chip microcomputer 1 _1,0--P _1,7

3, musical instrument temperament instrument according to claim 1 is characterized in that pin DATA, the CLOCK of described SI PO shift register 12 and STB draw the pin P from single-chip microcomputer 1 respectively _3,0, P _3,1And P _3,4

4, musical instrument temperament instrument according to claim 1 is characterized in that described undertension display circuit 15 is made of transistor switching circuit 23, and voltage signal is added in its base stage, and triode is attempted by the direct supply two ends with after light emitting diode 21 is connected.

5, musical instrument temperament instrument according to claim 1 is characterized in that described amplifier 8, reshaper 9, phase inverter 10 and half value voltage generator 11 constitute by operational amplifier.