CN203026112U - Wireless electronic piano system - Google Patents

Abstract

The utility model provides a wireless electronic piano system. The wireless electronic piano system comprises a single chip microcomputer arranged in an electronic piano, wherein the single chip microcomputer serves as a central processor and is respectively connected with a radio frequency receiving and dispatching module, a dot matrix module, a functional press key input module and a loudspeaker playing module. The wireless electronic piano system has the advantages that the function of a conventional electronic piano is retained, the voice frequency communication between the two electronic pianos is realized through the radio frequency receiving and dispatching module, the played music is remotely transmitted, and musical notes are displayed, thus the two electronic pianos synchronously resonate.

Description

A kind of wireless electronic piano system

Technical field

The utility model relates to the high-tech electronic music field, relates to specifically a kind of wireless electronic piano system.

Background technology

Mellotron is a representative of high-tech music field, it is a condensation product of classical culture and modern civilization, it not only can help the Music Teacher to carry out the education and instruction work of traditional music culture, and because it possesses contemporary music, the particularly basic structure of electronic music, computer music, feature, thereby generally used by people in the teaching of carrying out contemporary music, electronic music, computer music, yet, the cost that mellotron spends is relatively high, and volume large, be inconvenient to carry.

The utility model content

The utility model is in order to solve above-mentioned technical matters, a kind of wireless electronic piano system is provided, the utility model had both kept the function of conditional electronic qin, can realize two voice communications between mellotron by radio frequency transceiving module again, the long-distance transmissions playing music, and the demonstration note, thereby make both realize the effect of sympathetic response.

The technical scheme that the utility model adopts is: a kind of wireless electronic piano system, comprise the single-chip microcomputer that is positioned at mellotron, described single-chip microcomputer is as central processing unit, and described single-chip microcomputer is connected with radio frequency transceiving module, lattice module, function button load module and loudspeaker playing module respectively.

Lattice module described in the utility model is the 6*6LED dot matrix screen.

Single-chip microcomputer described in the utility model is STC5 series IAP5F2K6S2 single-chip microcomputer.

Radio frequency transceiving module described in the utility model is the NRF24L0 radio receiving transmitting module.

Loudspeaker playing module described in the utility model comprises hummer, and the timer T0 of single-chip microcomputer inside produces the square wave of different frequency, drives hummer and sends the sound of different frequency, thereby play out beautiful moving music; By radio frequency transceiving module, the sound signal that transmitting terminal produces is passed to receiving end, make both reach the effect of synchronous sympathetic response.

the beneficial effects of the utility model: the utility model had both kept the function of conditional electronic qin, can realize two voice communications between mellotron by radio frequency transceiving module again, the long-distance transmissions playing music, and demonstration note, thereby make both reach the effect of synchronous sympathetic response, central processing unit of the present utility model adopts single-chip microcomputer, it is high that it has integrated level, complete function, reliability is high, volume is little, low in energy consumption, easy to use, the series of advantages such as cheap, thereby can expand the function of general mellotron and make its more hommization, the utility model can be expanded playback function and record institute by note, and can repeat the song that playback is played.Also can increase the long distance wireless module expanded functions such as CC0, bluetooth, wifi, realize remote communication.In addition, due to reasons such as design volume own are little, lightweight, cost is low, low in energy consumption, convenient people carry, and price also reduces a lot on original basis, is fit to ordinary populace and buys.Can also carry out certain Function Extension, can realize the radio communication that single control is a plurality of, can be applicable to the multiple fields such as entertainment teaching, traffic, network communication.

Description of drawings

Fig. 1 is structure principle chart of the present utility model.

Embodiment

As shown in the figure, a kind of wireless electronic piano system, comprise the single-chip microcomputer that is positioned at mellotron, described single-chip microcomputer is as central processing unit, and described single-chip microcomputer is connected with radio frequency transceiving module, lattice module, function button load module and loudspeaker playing module respectively; Described lattice module is the 6*6LED dot matrix screen; Described single-chip microcomputer is STC5 series IAP5F2K6S2 single-chip microcomputer; Described radio frequency transceiving module is the NRF24L0 radio receiving transmitting module.

Often the A sound above middle pitch C is decided to be standard pitch in music, its frequency is f=440Hz, and its lingering sound all compares with it.F and f2 are two notes, if f2=f*2 claims f2 than the high octave of f.Just in time differ an octave between note in music (do) and note i, claim it to differ an octave in musicology.

In an octave, 2 semitones are arranged.Take--ⅰ octave district is as example.2 semitones are:--#, #--2,2--#2, #2-3,3-4,4--#4, #4-5,5--#5, #5-6,6--#6, #6-7,7-ⅰ.Due to the auditory effect of people's ear, the calibration of these 2 syllables is divided with logarithmic relationship basically.As long as known the pitch of these 2 notes, namely the frequency of its basic music, just can obtain according to the octave relation between note the basic pitch frequency of other notes.

In order to allow single-chip microcomputer send the sound of different frequency note, only need that timer is preset different timing values and realize.

Take standard pitch A as example:

Frequency f=440Hz of standard pitch A, its corresponding cycle is:

T=/f=22u

Therefore need to be the square-wave pulse of T=2272us in the single-chip processor i/o mouth output cycle, see Fig. 4.

As shown in Figure 4, single-chip microcomputer output high level and low level signal are:

t=T/2=u

That is to say, on single-chip microcomputer, the down trigger time of timer is 36us.If single-chip microcomputer adopts the timer working method, it is take ten two divided-frequency signals of oscillator as count pulse.If the oscillator frequency of external crystal oscillator is f0, the initial value that presets of timer is determined by following formula:

t=2*(COUNT—TT)/f0

In formula, Count=65536, Thl are timer counting initial value to be determined.Therefore the initial value of the height counter of timer is:

TH=TT/256=(Count—t*f0/2)/256

TL=TT%256=(Count—t*f0/2)%256

If the crystal oscillator of the external 2MHz of single-chip microcomputer, F0=2MHz, with t=36us and two formulas above the f0=2MHz substitution, the initial value that can try to achieve the timer height counter of standard pitch A under single-chip microcomputer timer working method is:

TH _?A=TT/256=(65536—36*2/2)/256=FBH

TH _?A=TT%256=(65536—36*2/2)%256=90H

According to the top method of asking, can obtain the initial value that presets of the corresponding counter of other tones.

The pulse that utilizes the timer T0 of single-chip microcomputer inside can send different frequency, the different pulse of frequency will be sent different tones after the drive circuit of loudspeaker amplification filtering.Secondly, timer produces by the timing parameters that arranges and interrupts, if this time interrupt sending pulses low, pulse high level is sent in counter-rotating next time, because timing parameters is different, 0 pulse of thereupon delaying time after unclamping, but continue to detect button at 0 impulse duration of time-delay, sound is constant if the button that has again key to be pressed this moment and press is still for former key, otherwise sends the tone of another key that is pressed.Singlechip chip can by to the reading and corresponding address of key scan program singal, take out LED dot matrix screen code displaying and T0 initial value to produce different voice signals.

Wireless radio frequency modules adopts NRF24L0, is configured as Enhanced hockBurstTM transceiver mode, and the configuration words of ShockBurstTM can be divided into data width, address width, address, four parts of CRC.The sound signal of playing be can receive and dispatch after configuration successful, interesting to listen to tone and beat played by button.

Claims (4)

1. wireless electronic piano system, it is characterized in that: comprise the single-chip microcomputer that is positioned at mellotron, described single-chip microcomputer is as central processing unit, and described single-chip microcomputer is connected with radio frequency transceiving module, lattice module, function button load module and loudspeaker playing module respectively.

2. a kind of wireless electronic piano as claimed in claim 1 system, it is characterized in that: described lattice module is the 16*16LED dot matrix screen.

3. a kind of wireless electronic piano as claimed in claim 1 system, it is characterized in that: described single-chip microcomputer is STC15 series IAP15F2K61S2 single-chip microcomputer.

4. a kind of wireless electronic piano as claimed in claim 1 system, it is characterized in that: described radio frequency transceiving module is the NRF24L01 radio receiving transmitting module.

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