CN202171944U

CN202171944U - Electronic organ

Info

Publication number: CN202171944U
Application number: CN2011203046687U
Authority: CN
Inventors: 盛雪
Original assignee: Harbin Normal University
Current assignee: Harbin Normal University
Priority date: 2011-08-19
Filing date: 2011-08-19
Publication date: 2012-03-21
Anticipated expiration: 2021-08-19

Abstract

The utility model relates to an electronic organ, comprising a keyboard module, a core module and a sounding module, wherein the core module uses a single chip microcomputer AT 89C2051, the keyboard module and the input pins P1.1-P1.7 of the single chip microcomputer are connected, and the sounding module and the output pin P3.6 of the single chip microcomputer are connected, and transmit a signal to a speaker via an integrated power amplifier LM386. The keyboard module is used for playing the electronic organ, the core module is used for generating electric signals of different frequencies, and the sounding module is used for amplifying an electric signal and playing an audio signal. The single chip microcomputer is used as the core module, having the characteristics of high performance and high speed, the electronic organ is sample in volume, portable, stable, reliable and widely used, playable note number can be randomly increased by improving the keyboard module and the sounding module, the cost is low, and the price is cheap, thus having popularity.

Description

A kind of mellotron

Technical field

The utility model relates to a kind of mellotron.

Background technology

At present, no matter existing mellotron is that specialty is played usefulness, still as amateurish play with or children use; Mellotron normally sends signal through button, again electrical signal conversion is become sound, yet; The control circuit structure is comparatively complicated, and volume is bigger, and cost is higher.

Summary of the invention

The purpose of the utility model is to overcome the weak point that exists in the above-mentioned technology, and a kind of compact conformation, reasonable in design is provided, and volume is little, a kind of mellotron that cost is low.

In order to achieve the above object; The technical scheme that the utility model adopts is: comprise Keysheet module, nucleus module and voice module; Described nucleus module adopts single chip computer AT 89C2051, and described Keysheet module links to each other with single-chip microcomputer input pin P1.1 one P1.7, and voice module links to each other with single-chip microcomputer output pin p3.6 and through integrated amplifier LM386 signal passed to loudspeaker; Wherein, Keysheet module is used for electronic organ performance, and nucleus module is used to produce the electric signal of different frequency, and voice module is used for electric signal is amplified and playing audio signal.

The utility model has the advantages that:

Single-chip microcomputer as nucleus module, is had high-performance, characteristics such as high-speed, and volume is little, is easy to carry; Reliable and stable, can be widely used, it can play the note number through improving Keysheet module and any increase of voice module; With low cost, low price has popularization.

Description of drawings

Fig. 1 is the utility model circuit theory diagrams;

Embodiment

Embodiment to the utility model describes in further detail below in conjunction with accompanying drawing.

Can know by Fig. 1; The utility model comprises Keysheet module 1, nucleus module 2 and voice module 3; Described nucleus module 2 adopts single chip computer AT 89C2051, and described Keysheet module 1 links to each other with single-chip microcomputer input pin P1.1-P1.7, and voice module 3 links to each other with single-chip microcomputer output pin p3.6 and through integrated amplifier LM386 signal passed to loudspeaker; Wherein, Keysheet module 1 is used for electronic organ performance, and nucleus module 2 is used to produce the electric signal of different frequency, and voice module 3 is used for electric signal is amplified and playing audio signal.

The utility model in the drawings P1.1-P1.7 connect respectively 7 buttons corresponding 1,2,3,4,5,6,7 seven note in the melody.The P3.6 mouth links to each other with loudspeaker through power amplification chip LM386.Single-chip microcomputer is just carried out corresponding subroutine a counting of timer tax initial value is made P3.6 mouth output high level simultaneously when having a button to press among P1.1～P1.7.When timer regularly finishes, the counting initial value is also composed in the value negate of P3.6 mouth again and continued counting; When having counted once more again with the value negate of P3.6 mouth initialize counting again; So circulation just produces the square wave of certain frequency at the P3.6 mouth, LM386 with this square wave through just produce the sound of corresponding note after power amplification through loudspeaker output.Thereby just carry out different subroutines by the different keys single-chip microcomputer and compose the square wave output different audio that different initial values obtains different frequency, therefore export a kind of note by a button to timer.The spectral range of sound arrives several KHzs about tens; If can utilize program to come certain mouthful of control single chip computer line constantly to export " height " " low " level; Then on this mouthful line, just can produce the square wave of certain frequency, this square wave is connected the sound that loudspeaker just can send certain frequency, if utilize the duration of programmed control " height " " low " level again; Just can change the frequency of output waveform, thereby change tone.In the melody, each note corresponding definite frequency, if the frequency of the frequency of certain mouthful of single-chip microcomputer line output " height " " low " level and certain note is the same, so this mouthful line is connected the sound that loudspeaker just can send this note.Native system is exactly according to this principle design; The square wave that for the AT89C2051 single-chip microcomputer, will produce certain frequency roughly is earlier with certain mouthful of line output high level a period of time output low level again of delaying time then; So round-robin output will produce the square wave of certain frequency; Just can change the frequency of output square wave through the time that changes time-delay

Claims

1. mellotron; Comprise Keysheet module (1), nucleus module (2) and voice module (3); It is characterized in that: described nucleus module (2) adopts single chip computer AT 89C2051, and described Keysheet module (1) links to each other with single-chip microcomputer input pin P1.1 one P1.7, and voice module (3) links to each other with single-chip microcomputer output pin p3.6 and through integrated amplifier LM386 signal passed to loudspeaker; Wherein, Keysheet module (1) is used for electronic organ performance, and nucleus module (2) is used to produce the electric signal of different frequency, and voice module (3) is used for electric signal is amplified and playing audio signal.